JPH02214343A - Mobile communication communication method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a communication method for mobile communication. Furthermore, the present invention relates to a communication method that satisfies the communication quality when the communication quality deteriorates due to movement of a mobile terminal during communication in mobile communication using a small zone configuration.

More specifically, even if the moving speed of the moving body becomes relatively large compared to the size of each zone of a system with a small zone configuration, no inconvenience will occur,
The aim is to provide a communication method that ensures good communication and has excellent frequency efficiency, communication quality, wireless line control ability, etc.

[Prior art] Generally, when performing mobile communication within a wide service area, one wireless base station covers the entire area and provides services.
The method for communicating with mobile objects within an area is called the large zone method. In contrast, the small zone method
An area is divided into multiple small areas, one wireless base station is installed in each divided area, and mobile wireless devices within each area communicate with these wireless base stations. It is.

The conventional small zone system is employed, for example, in the car telephone system of NTT (Nippon Telegraph and Telephone ■), which is currently in commercial service. In this case, the mobile radio installed in the car moves away from the wireless base station of the other party's phone call as the car moves, and for example, if it becomes 5 to 7 KIn or more from the wireless base station, the received electric field value of the radio wave decreases. , deterioration of call quality occurs. Therefore, in a small zone configuration, wireless base stations are installed 10 to 12 floors apart from each other within the service area, so in the above case there is always another wireless base station near the current location of the car (within 5 or 6 floors). A station exists and uses another radio channel to continue the call between the new radio base station and the mobile radio. In the NTT system, a radio line control station is installed to control a large number of radio base stations and mobile radios, and the radio line control station controls the setting and cancellation of calls on radio lines. It is connected to the general telephone network via a barrier switch. When a deterioration in call quality occurs, the radio network control station makes multiple radio base stations around the mobile radio receive the radio waves transmitted by the mobile radio, and assigns a specific one of these radio base stations to communicate with the mobile radio. When it is determined that the desired call quality can be maintained by setting a new radio channel between the mobile radio and the radio base station, the new channel is set between the mobile radio and the radio base station.

FIG. 9 shows a conceptual diagram of the configuration of a conventional system that operates as described above, and will be described using this diagram.

In Figure 9, radius 5 to 7 KI1 surrounded by four circles
Each zone 14A, 148, 140, 14D of about 1 zone is the service area of the car telephone, and the mobile radio device 15 currently installed in the car is the wireless base station 1 in the zone 14A.
Assume that communication is in progress with 3A.

Since the automobile is traveling from zone 14A to zone 14C, the relative distance between radio base 813A and mobile radio 15 is increasing.

Assuming that the communication is continuing and the car moves from zone 14A to zone 14C, the distance between the wireless base station 13A and the mobile wireless device 15 will be 5 to 7 touch points or more, and the input electric fields of mutually received radio waves will increase. The value decreases until the transmission quality falls below a certain level. This state of quality deterioration is constantly monitored by the radio network control station 12, and when the quality drops below a certain standard, the radio base stations 13B, 13G, and 13D in the vicinity of the radio base station 13A are Station 13A
and the mobile radio device 15 to measure the quality of the radio channel (assumed to be channel CH1) in use.

Radio base stations 138, 130 and 13 that received this request
At D, each receiver tunes its own wireless channel search receiver (not shown) to channel CHI and receives the signal;
The status is reported to the radio network control station 12.

The radio network control station 12 that received this report receives the received input electric field E3 of the radio base stations 13B, 13C, and 13D,
Compare the values of EC and E, and find that EC>28. EC>E
o, and when the EC confirms that a certain level of quality is ensured from the perspective of transmission quality, the radio network control station 12 considers the transition from zone 14A to zone 14C, and uses it in zone 14A. Radio channel C
)-11 and instead starts a procedure for using an unused channel (assuming channel CHIO) among the available radio channels in the radio base station 13C of the zone 14C, that is, switching the channel during a call.

The following is a reference document: Old and other "Car telephone radio line control" Nippon Telegraph Telephone Telecommunications Research Institute Research and Practical Application Report Vo 1.26
．． No. 7 See page 1885 L/ @ Kara Explain.

(1) Channel switching signals are transmitted between the radio network control station 12 and each radio base station 13 using control lines included in each transmission path 16, and between each radio base station 13 and mobile radio device 15. teeth,
This is a wireless communication channel.

(2) A channel switching signal is sent to the mobile radio 15 from the radio base station 13A with which communication was previously performed, and a radio continuity test tone is sent from the radio base station 13C, which is currently communicating with the mobile radio. It is sent to the mobile radio device 15.

(3) When the mobile radio 15 cannot receive the radio continuity test tone, it returns to the old communication channel set with the radio base station 13A and continues the communication.

The above (1) to (3) are the channel switching methods currently used by NTT during a call, but as is clear from these explanations, the caller, i.e., the car phone user, may experience the following noises during a call. It will be mixed in. That is, (a) the control signal for switching according to (1) above (in this case, a 300 bits/second digital signal) is inserted into the channel in progress as soon as the other party's signal is disconnected. Since it appears in the output of the receiver, it is mixed into the call as an audible sound of about 300H2, and the call is interrupted during this time.

(b) During the call test described in (2) above, there is no noise, but there is no sound, and during this period, the other party's voice is not transmitted to you, and your own voice is not transmitted to the other party (call disconnection).

The duration of call interruption due to (a) and (b) above is 0.7
It is said to be ~0.8 seconds. On the other hand, the radio network control station 12
Then, the wireless base station 13G is instructed to start a conversation with the mobile wireless device 15 using, for example, channel CH10 via the transmission path 16C between the two. This instruction is also carried out at the same time as the continuity test described above, so from this moment on, the radio base station 13A ends communication with the mobile radio 15, and the radio base station 13G instead communicates with the mobile radio 15. start communication.

The radio line control 812 also controls the communication path switch SW in the gateway exchange 19 for connecting each radio base station 13 to the telephone network 10 to the gateway switch 19 that forms an interface with the telephone network 10. A request is made to switch from station 13A to station 130. That is, turn off the A-4 switch using the communication path switch SW in FIG.
) and turn on the C-4 switch (indicated by a black triangle). By the above operations, you can use the mobile radio 15 in the car to connect any telephone in the telephone network 10 to the car. Regardless of where the user moves to zones 14A, 14B, 14C, and 140, the call will continue.

In this way, the user (caller) is given a technical guarantee that he or she can make a call anytime and anywhere within the service area while the car is in motion. That service is good.

Mobile communications that employ such a small zone configuration have become able to exhibit the following features that are not found in large zone systems.

(a) Effective use of frequencies through a so-called small zone configuration, in which the radio waves from one wireless base station are used only in a narrow area, and many wireless base stations are placed in the service area and the same frequency is used repeatedly. became possible.

(b) With the advent of digital synthesizers, it has become possible for mobile radios to switch between hundreds of radio channels, and to connect these many mobile radios to radio base stations. Since the technology for setting and controlling wireless lines has been established, it has become possible to contribute to the effective use of frequencies in item (a).

(C) The radio channel control technology necessary to efficiently control the settings of radio channels for making and receiving calls for a large number of mobile radio devices has been established. It is now possible to switch wireless channels during communication when changing zones during wireless communication.

[Problem to be solved by the invention] However, in the conventional method as illustrated in FIG.
The problem is that technical measures are insufficient or no measures have been taken, making users feel inconvenienced and unable to provide satisfactory services. It was necessary to promote effective use and improve service quality.

These problems to be solved will be explained below.

) In order to make effective use of frequencies, it is necessary to reduce the zone radius of one zone in a small zone configuration, but if this becomes too small, mobile radios may
The probability of passing through one zone and transitioning to another increases. Then, when migrating between zones, it is frequently necessary to change the wireless channel assigned to each zone, and at this time, it is necessary to change the old wireless channel to the new wireless channel for both the wireless base station and mobile wireless device. . conventionally,
Although this change was made at the radio network control station 12 (FIG. 9), communication was temporarily interrupted due to this channel change, and communication quality deteriorated.

ii) There was an example in which mobile radio devices with different transmission powers were introduced into the same system and operated as devices within one system. This is, for example, a mobile radio installed in a car (in the case of an NTT car phone, the transmission output is 5
W> and a mobile phone 1 (transmission output 1W in the case of NTT) that accesses a wireless base station for a car phone that the user can carry outdoors are housed in the same system.
Since the wireless equipment housed in the wireless base station can be shared, it is possible to construct an economical system.

However, from the point of view of effective frequency use, it complicates the creation of rules for reusing the same frequency, which reduces the effectiveness of effective use, and also causes differences in transmission power levels. This increases the possibility of interference from other mobile radios. In order to prevent this, costs have increased and the effective use of frequencies has been compromised.

Reusing the same frequency can be dealt with by increasing the control capabilities, but there are limitations to this as well.
If the small zoning progresses beyond a certain point, it may become uncontrollable.
This results in a system that is not cost-effective at all.

Interference has not been solved by conventional methods and has been a major problem in conventional systems.

Therefore, from the standpoint of effective use of frequencies, there is a limit to the effective use of frequencies, and it has not been possible to meet the requirements in terms of utilization of limited radio wave resources.

iii) As the number of small zones progresses, there are many situations in which within a small zone served by one wireless base station, small zones served by an adjacent or the next adjacent wireless base station overlap, and conventional technology as a wireless line control technology There was a possibility of loss of control when using

This is because radio wave propagation characteristics are greatly affected (propagation loss) by topography and structures within one small zone. The effect of this is that in order to make effective use of frequencies, zones are becoming smaller, and the range of one small zone becomes smaller (radius of 1 KI).
n or less), it becomes relatively large. In addition, relatively high-level transmitters are used for the radio base 8 and mobile radio equipment used to ensure good communication even in areas affected by terrain or structures. This means that in areas where there is no influence from terrain or structures, it becomes possible for a radio base station located far away to communicate with a mobile radio device located in another zone.

Therefore, the original concept that one small zone is managed by one wireless base station and that a wide plane that is the service area is covered by many small zones disappears, and many small zones are superimposed and become one. It was decided to form a service area.

As a result, in order to smoothly operate a small zone system in such a state, with the conventional technology, it is necessary to frequently set up, change, and cancel the wireless communication path, which reduces the capability of the wireless line control device. The result will be significantly higher. Therefore, it is practically impossible to secure a smooth communication path, and consideration has been given to how to avoid such a situation (in terms of system configuration).

iv) In mobile communications, the communication quality changes significantly due to the influence of radio wave propagation characteristics as the mobile body moves, and in places where radio waves propagate poorly, communication quality is required for the system. There were problems such as the value being below the value. Various measures have been taken to solve this problem, such as diaperity technology, but all of them have problems such as not only reducing the cost of the equipment but also impairing the effective use of frequencies.

Furthermore, call interruptions due to transition between zones during a call are considered to be a type of communication quality problem, and a solution was needed from the standpoint of quality assurance.

V) No measures were taken to deal with fluctuations in communication traffic within the system.

Communication traffic fluctuations within the system, for example, are usually extremely low in public communications late at night or early in the morning, during the day around 10 a.m. and between 2 to 3 p.m., and in car telephones.
A large pile of traffic can be seen between 5 and 6 o'clock, but if the system is designed to function satisfactorily even during the peak traffic hours, the system components will be idle during off-peak hours, resulting in high costs. If a system was constructed that was suitable for off-peak hours, the cost would be extremely low, but it would become unusable during peak hours, resulting in a decline in service quality.

In addition, when communication traffic is slow, idle facilities within the system are effectively used to provide high-quality services, and as traffic increases, the system is transitioned to regular service. They lacked the concept of using it. One reason for this is considered to be that the system cost would rise sharply if attempts were made to solve this problem using conventional techniques.

Furthermore, when all the transceivers of a radio base station are in use, conventional systems do not have the processing capacity to process even extremely short and regular signals such as device registration signals made up of mobile radios. This was a technical constraint on the progress of smaller zones.

vi) Conventionally, the location registration of mobile units communicating was done by registering and processing only the data received at one wireless base station at the same time. In systems that are subject to frequent changes, or in systems where there are restrictions on the location registration method due to the effective use of frequencies, it may be impossible to receive a call to a mobile unit due to a defect in location registration.

If the wireless transmitter/receiver installed at the wireless base station has only one channel, it must be used for control and communication in a time-sharing manner, and when communicating with a mobile wireless device, it must be used in the same zone. There was a significant negative impact when there was a location registration request from another mobile radio.

Item v) The technology for providing mobile communication services using wideband signals was insufficiently mature and unfinished, causing inconvenience to users.

Conventionally, the mobile communication services that have been widely used have mainly been telephone, and those that use wide frequency bands, such as high-speed data signals, have rarely been used. This is because in mobile communication, the radio wave propagation characteristics change greatly as the mobile body moves, and there was a lack of technology to properly receive wideband signals.

viii) Wireless line control ability and reliability were insufficient. Previously, setting up or canceling a wireless line, or switching channels during a call, etc., was done only once within a certain area.
This was done by radio line control stations or radio system control equipment installed to centralize control at a specific location. Although this is effective in terms of unified management of line control through centralization, if a failure occurs in this system, it will cause a fatal accident in which the entire system will go down. Therefore, countermeasures such as duplication of hardware have been taken, but these have resulted in increased costs and have not produced satisfactory results.

ix) In conventional land-based mobile communications, except in special cases, estimating the moving direction of a mobile object during communication has not been carried out due to technical difficulties.

Therefore, it was not possible to obtain effective information such as the wireless line traffic situation in the area in the direction of movement, and problems remained in terms of effective frequency use and traffic management.

×) Momentary interruptions occurred when switching channels during calls between zones or within a zone, and this was also a major obstacle to creating smaller zones.

In the call channel switching method implemented by NTT, which was explained using FIG. It has the disadvantage that some of the signals (300 bits/sec) are noisy. If there is a temporary interruption in the call line or noise, it can be compensated for by relistening if the content of the call is voice.1. Although it is not a major problem, when a facsimile terminal is installed in a car and used for sending and receiving, if the channel is changed during operation, for example, when a 1-minute facsimile is sent, 0.8/60 of the page becomes black. This has the disadvantage that lines (or white lines) appear and the received image quality is significantly degraded. In the case of data communications, for example, in a 1200 baud data signal, approximately 1000 bits of the signal are lost, requiring procedures such as retransmission.

In order to remove the harsh noise, there are methods such as silencing during channel switching or using out-of-band signals, but even if the purpose of removing the harsh noise can be achieved, the line disconnection time still remains. However, the problem remains that it is completely ineffective in eliminating the negative influence on facsimile and data signals.

xi) When the moving speed of a mobile object becomes relatively large compared to the size of each zone in a system with a small zone configuration, for example, in a mobile phone with a small power output (10 mW), one zone The size of the device is approximately 200m in radius at most, and if you try to take it into a moving car and make a call, the conventional method would cause problems with the reliability of the control signal transmission quality, resulting in communication being impossible. There was a case.

[Means for Solving the Problems] A plurality of radio base stations including a radio transceiver and an ID identification storage unit, a group of switches connecting the plurality of radio base stations and a telephone network, and a call path control for controlling the group of switches. A wireless communication device that simultaneously receives a plurality of channels in order to simultaneously communicate with a plurality of wireless base stations without moving within a service area covered by the plurality of wireless base stations; A system was constructed that includes a mobile radio that includes a receiving circuit and a radio transmitting circuit that transmits multiple channels simultaneously.

[Operation] While multiple radio base stations and mobile radio devices are communicating the same communication content in parallel using multiple channels,
If a channel (old channel) whose communication quality falls below a certain value occurs, another channel that satisfies the certain communication quality
Communication with one wireless base station is switched to another channel (new channel), communication on the old channel is terminated, and the same communication content can be communicated without momentary interruption using multiple channels including the new channel. I made it. As a result, the following actions and effects could be obtained.

i) The reliability of location registration has been improved because each radio base station and barrier switch is equipped with an ID identification storage unit, and the location of mobile radio equipment is registered in parallel based on the data of each radio base station. .

11) Since one channel among multiple channels whose communication quality has deteriorated is switched to a new channel, it is possible to achieve seamless channel switching during calls between zones or within zones.

111) Ensuring good communication quality through the adoption of economical transmitting and receiving diapersity, in other words, reducing interference, and making new services using broadband signals technically possible.

1V) When traffic is slow, many channels are used to carry out parallel communication, which makes effective use of radio equipment and improves communication quality.

V) Since each wireless base station is equipped with an ID identification storage unit and a function that enables simultaneous transmission and reception of multiple wireless channels through high-speed switching, it is possible to process location registration signals from mobile wireless devices even during peak traffic times. It became.

vi) Parallel communication of multiple channels improves the transmission characteristics of wideband signals and improves line quality by 1! ? It was done.

v+i) It has become possible to estimate the direction and speed of movement of a mobile radio, and it has become possible to ensure communication in the destination zone and to carry out advance allocation of channels to be used in the movement prospect zone.

viii) By distributing the functions of wireless line control from the centralized system as in conventional systems to mobile radios or radio base stations, improved control processing ability and system reliability have been achieved.

ix) Repeat the location registration, call origination, and call reception operations a specified number of times, and if a good communication condition cannot be obtained, the process shifts to high-speed movement mode, and even when moving at high speed,
This ensures high communication reliability.

Here, the high-speed movement mode refers to a mode in which, in normal communication methods, inconvenient phenomena occur due to high-speed movement. On the other hand, a mode in which the movement speed does not cause any obstacles is called a low-speed movement mode.

In the high-speed movement mode, the moving direction and speed of the mobile radio device is measured, and the gateway exchange contacts the radio base station in the moving direction in advance to prepare for communication.

Furthermore, in order to improve the reliability of the transmission and reception of control signals between the radio base station and the mobile radio, it is now possible to use transmission and reception diversity.

Furthermore, when a portable radio telephone is used as the mobile radio of the present invention, its power source can be obtained from a car, and in that case, the transmission power is increased compared to when it is carried.

[Embodiment] FIG. 1A, FIG. 1B, and FIG. 1C show an example of a system configuration for explaining an embodiment of the present invention.

In FIG. 1A, 10 is a general telephone network, which includes an exchange 11 for general telephones.

Reference numeral 20 denotes a gateway exchange for connecting the general telephone exchange 11 included in the telephone network 10 and the wireless system. Kanmon exchange e! The machine 20 has a plurality of wireless base stations 30-1.
．． 30-2. −． 30-n and many mobile radio devices and telephones accommodated in the general telephone network 10, and transmits and receives control signals between each of the radio base stations 30-1 to 30-n. , a communication path control unit 21 that controls communication path setting cancellation, etc., and connection between each N line base station 30-7 to 30-n and the barrier exchange 20 and the exchange 11 under the control of the communication path control unit 21. A switch u23 necessary for switching the communication path to accomplish this is included.

FIG. 1B shows a mobile radio 50 that communicates with each radio base station 30 to 1.30-2. The received signal received by the antenna section enters a radio reception circuit 68 that includes a reception mixer 63 and a reception section 53, and the output communication signal is inputted to a control section 58 and a telephone section 59. A communication signal output from the telephone section 59 is applied to a wireless transmission circuit 66 including a transmission mixer 61 and a transmission section 51, and the transmission signal is sent out from the antenna section and received by the wireless base station 30. In addition, a communication quality monitoring section 57 that constantly monitors the call quality during communication and reports it to the control section 58 when it deteriorates, monitors the presence or absence of interference during communication and detects interference exceeding a certain level. If this happens, the interference detector 62 reports it to the control unit 58, the ID of the own mobile radio 50 is memorized, the ID/Roam An area information collation storage section 54 is provided with connections as shown.

This mobile radio device 50 further includes a synthesizer 55-1.
．． 55-2. ..., 55-n and 56-1.56-
2. ..., 56-n, and selector switch 64-1.64
-2, and a reception switching controller 65C and a transmission switching controller 67C that generate signals for switching and controlling the changeover switches 64-1 and 64-2, respectively.
Synthesizers 55-1 to 55-n and 56-1 to 56-
n and both switching controllers 65C and 67C are connected to the control unit 5.
8. Each synthesizer 551-5
A reference frequency is supplied from a reference crystal oscillator 71 to 5-n and 56-1 to 56-n.

FIG. 1C shows a radio base station 30 (for example, 3O-1) that communicates with the mobile radio device 50, which has almost the same configuration as the mobile radio device 50 shown in FIG. 1B, but has a different configuration. The transmission and reception switching regulations tl1655-
1 to 55-n, 56-1 to 56-n, there is no changeover switch 64-1, 64-2 for switching the synthesizer,
There is no ID/roam area information collation storage section 54 (Fig. 1B), and the synthesizer is also used for reception and transmission 35-1.3.
6-1, and an ID identification storage unit 3 for identifying and storing ID numbers of the self and the called party.
4, there is no telephone section 59 (FIG. 1B), and an interface 39 to the gateway exchange 20, which takes the place of the telephone section 59, is provided.

Each component corresponding to FIG. 1C and FIG. 1B will be listed below, and description of each function will be omitted. Here, the numbers in parentheses are the numbers of the corresponding components in FIG. 1B.

Transmitting section 31 (51) Receiving section 33 (53) Synthesizer 35-1 (55-1 to 55-n) Synthesizer 36-1 (56-1 to 56-n) Communication quality monitoring section 37
(57) Control unit 38 (58) Reference crystal oscillator 40 (71) Transmission mixer 41 ('61) Interference detector 42 (62) Reception mixer 43 (63) Radio transmission circuit 46 (66) Radio reception circuit 48 (68 ) FIG. 1D shows another embodiment 30B of a radio base station 30 (for example, 30-'1) that communicates with a mobile radio 50.
The configuration is almost the same as that of the mobile radio device 50 shown in FIG. 1B, and the difference is that the ID, ROHM,
It does not have an area information verification storage section 54 (FIG. 1B), has an ID identification storage section 34 for identifying and storing the ID numbers of itself and the called party, and does not have a telephone section 59 (FIG. 1B).
The point is that an interface 39 to the barrier exchange l/s 20, which takes the place of the telephone unit 59, is provided.

Each component corresponding to FIG. 1D and FIG. 1B is listed below, and description of each function is omitted. Here, the numbers in parentheses are
1B is the number of each corresponding component in FIG. 1B.

Transmitting section 31 (51) Receiving section 33 (53) Synthesizers 35-1 to 35-n (55-1 to 55-n) Synthesizers 36-1 to 36-n (56-1 to 56-n) Communication quality monitoring section 37 (57) Control unit 38B (58) Reference crystal oscillator 40 (71) Transmission mixer 41 (61) Interference disturbance detector 42 (62) Reception mixer 43 (63) Radio transmission circuit 46 (66) Radio reception circuit 48 (68 ) FIG. 1E shows another embodiment of a wireless base station 830 in which a wireless base station 30C including multiple transceivers handles many calls sharing an antenna sharing device 96 and a wireless base station controller 32. ), the wireless receiving circuit 48 and the communication quality monitoring unit 37 shown in FIG. 1D.
m communication quality monitoring receivers 4193- having both functions of
1 to 93-m and a control transceiver 94 dedicated to a control channel for control signals are shown, and are connected to the telephone network 10 via a barrier switch 20.

The configuration of one transmitter/receiver 11190 of the transmitters/receivers 1190-1 to 90-m used in FIG. 1E is shown in FIG. The connection relationship between the section 38C1, the interface 39G with the barrier exchange 2o, and the reference crystal oscillator 40G is shown.

The transceiver 90 shown in FIG. 1F has almost the same configuration as the wireless base station 30B shown in FIG. 1D,
Many transmitting/receiving TLs 190 share the ID identification storage section 34C1 control section 38C, interface 39C, and reference crystal oscillator 40C.

Since the transceivers 90 to 1 to 90-m in FIG. 1E have such configurations, the changeover switches 44-1.
44-2, if one specific synthesizer is selected from among the synthesizers 35-1 to 35-n and 36-1 to 36-n, the number of radio base stations 30C shown in FIG. 1E is m. channels can be transmitted and received simultaneously.

In addition, the changeover switch 44-1゜44- of the transmitter/receiver 90
If the synthesizers 35-1 to 35-n and 36-1 to 36-n are operated at high speed and repeatedly switched, one transceiver 90 can simultaneously transmit and receive n channels. Is possible. Therefore, the wireless base station 30C in FIG. 1E can simultaneously transmit and receive up to mxn channels.

Another embodiment of a mobile radio 1150 is shown in FIG. 1G.

The difference between the mobile radio 1150B shown in FIG. 1G and the mobile radio 50 shown in FIG. A receiving section 52 is provided, and both receiving mixers 63
and 73, the outputs of the synthesizers 55-1 to 55-n are applied via changeover switches 64-16 and 64-3 controlled by the reception switching controller 65C and the control unit 58B, respectively. Transmission switching controller 67
The point is that the outputs of the synthesizers 56-1 to 56-n are applied through a changeover switch 64-2 controlled by C.

The mobile radio device 50B shown in FIG. 1G has a function that has a particularly remarkable reception diversity effect.

A part of the reception signal received by the antenna section of the mobile radio device 50 is added to the reception mixer 73 . Receive mixer 7
The outputs from the synthesizers 55-1 to 55-n are added as local oscillation frequencies to the synthesizers 55-1 to 55-n via the changeover switch 64-3.

This changeover switch 64-3 is different from other changeover switches 64-
It is not necessary to switch at high speed like 1 or 64-2,
For example, a low switching speed of about 1OH2 is sufficient.

When the selector switch 64-3 is in the position to obtain the output of the synthesizer 55-1, the C/N value (value of V transmission-to-noise ratio) of channel Cl-11 measured by the C/N measurement receiving section 52 is The information is transmitted to the control unit 58B. Next, switch 6
When 4-3 is located 1q from the output of synthesizer 55-2, the C/N value of channel CH2 is measured. When the synthesizer 55-n is in a position to turn on the output of the synthesizer 55-n, the C/N value of CI-(n is measured and transmitted to the control unit 58B. The control unit 58B uses these values to The switching frequencies of the reception switching controller 65C and the transmission switching controller 67C are controlled, for example, so that they each operate at a speed inversely proportional to the C/N value.

Next, a system for further increasing the receiving diversity effect will be described. FIG. 1H shows an example of the configuration of the mobile radio device 50C in this case.

In Figure 1H, input radio waves (
input signal> is divided into n equal parts at the antenna input section, and each is divided into n equal parts by the radio receiving circuits 68-1, 68-2, . ... Arrive at 68-n. Each radio receiving circuit 68-1 to 68-n has a receiving mixer 63-1, 63-2. ..., 63-n, receiving sections 53-1. 55-2. ..., 55-
The local oscillation frequency from n is input. Therefore, in the configuration shown in FIG. 1B, the reception selector switch 6 shown in FIG.
There is no 41, but the regular wireless channels CH1, 0H2゜...
- It is possible to receive and demodulate CHn signals.

Further, a part of the output signals of these receiving parts 53-1 to 53-n is sent to the control part 58C, and the other part is added to the mixing circuit 69 to form a normal diapersity receiver (in this case, after the detection Processing is added in the same manner as in the synthesis), and the telephone unit 59
sent to. Further, a part of the output from each of the receiving sections 53-1 to 53-n is sent to communication quality monitoring sections 57-1 to 57n, respectively, and the outputs are applied to the control section 58C, respectively.

FIG. 11 shows a mobile radio device 50D that is different from the mobile radio device 50C shown in FIG. 1
.about.51-n, and a signal to be transmitted is commonly connected and applied to each transmitting section 511-51-n, and a signal to be transmitted is applied to each transmitting section 511-51-n respectively by a control section 58D. The outputs from the synthesizers 56-1 to 56-n, which generate controlled and instructed frequencies, are transmitted to each transmission mixer 61.
-1 to 61-n. This mobile radio device 50
Unlike the mobile radio 50G (FIG. 1H), the mobile radio D can continuously transmit multiple radio channels without chopping them using the changeover switch 64-2.

By adopting the circuit configuration as shown in FIG. 1H and FIG. 11, it is possible to obtain a large diversity effect of 1q.

FIG. 1J and FIG. 1 show embodiments of other radio base stations 30D and 30E, FIGS.
Transmitter/receivers 90-1 to 90-, m used in Figure E
Two exemplary embodiments of transceivers 90B and 90C are shown.

The radio base station 30D and transmitter/receiver 1190B shown in FIGS. 1J and 1L are connected to the mobile radio device 50 shown in FIG. 1H.
Similar to G, each independent synthesizer 35-1 to 35-3
5-n, and radio receiving circuits 48-1 to 48 including receiving mixers 43-1 to 43-n and receiving sections 33-1 to 33-n.
-n and communication quality monitoring units 37-1 to 37-n, the wireless base station 30 shown in FIG.
The configuration is the same as that of the transmitter/receiver 1190 shown in FIGS. These wireless base stations 30D and transceivers 9
By using the radio base station 30G using 0B, it is possible to expect a diversity effect when receiving Lurie control signals in high-speed movement mode, which will be described later.

First, the radio base station 30E and the transceiver 90C shown in FIGS.
Similarly to D, in addition to the receiving side, the transmitting side also includes independent synthesizers 36-1 to 36-n and a transmitting mixer 41.
-1 to 41-n and radio transmitting circuits 46-1 to 46-n including transmitting units 31-1 to 31-n. This is the same configuration as the transmitter/receiver 1190B shown in FIG. 1L.

By using the radio base station 30C using the radio base station 30E and the transceiver 90C, it is possible to expect a diversity effect when transmitting control signals in the high-speed movement mode, which will be described later.

Mobile radio equipment 50 (B, C, D) and radio base station 30 (
B, C, D, E), the control signal between the gateway exchange 20 may use a control channel dedicated to control signals, or may use a signal outside the speech signal band.

In order to transmit this control signal outside the communication (speech) signal band, specifically, when the control signal is an analog signal, a second
As shown in figure (a), the communication channel band is 0.3 to 3.
．． Low frequencies f, o outside 0KI-1z (e.g. about 10
0H2> or high frequency f()1. f02"03"
``I) 8 (for example, 8 waves from 3.8 KH2 to 4.5 KHz at intervals of 0.1 KH2) is used.

When there are many items to be controlled, that is, control data, the number of control frequencies fDo to fD8 may be increased roughly, or a subcarrier format may be used. At this time, for example, f. By applying frequency modulation or amplitude modulation to one or more waves of O"""f08, more control data can be transmitted.

Furthermore, when a digital data signal is used as a control signal, it is also possible to digitally encode the audio signal and time-division multiplex the two to be transmitted.
Shown in Figure (b). FIG. 2(b) shows an example of a case where the audio signal is digitized by the digital encoding circuit 9, and the audio signal is multiplexed with a data signal by the multiplex conversion circuit 92, and then applied to the modulation circuit of the transmitter 31.

Below, the functions of the mobile radio device 50 (B, C, D>), the radio base station 30 (B, C, D, E), and the barrier switch 20 will be explained in sequence.

(A>Mobile radio device 50 (B, C, D)) First, among the functions provided by the mobile radio device 50 (B, C, D>, the functions of the control unit 58 (B, C, D>) will be explained. Control unit 5
B (B, C, D>) has the following basic functions.

i) Own mobile radio vs50 (B, C, D) (7)
Commands the I-line transmitter circuit 66 to start or stop transmitting radio waves and controls the transmission power level.

1;) Instructs the radio receiving circuit 68 of its own mobile radio device 50 (B, C, D> to receive or stop radio waves.

1ii) Instructing the telephone unit 59 whether or not to send a dial signal and instructing the transmission/reception of voice.

iv) Synthesizer groups 55-1 to 55-n and 5
Excavation frequency (channel) designation, oscillation command and stop command for 6-1 to 56-n.

■) Control commands to the reception and transmission switching controllers 65C and 67C.

vi) Determining whether or not to change one or more channels to be used based on information from the communication quality monitoring unit 57.

vii) When performing channel switching during a call, remember the IDs of the radio base stations 30 (B, C, D, E) with which you have communicated so far. In particular, when switching communication channels in high-speed movement mode, the wireless base station 30 with which you have been communicating
(B, C, D, E) as well as the identification information (ID) of the subsystem to which they belong.

viii) Determining whether or not to change the used channel based on information from the interference detector 62.

iX) Confirm the ID of the other party to communicate with and determine the channel to be used based on the information from the ID/Roam area information verification storage unit 54.

X) Transfer of a communication channel to a mobile radio device with a higher service type.

xi) Determination of on/off duty conditions for the reception (transmission) switching controllers 65C and 67G.

xii) Regarding control decisions, the radio base station 30 (
B.

C, D, E). When this differs from the radio base station 30 (B, C, D, E) regarding control decisions, the radio base station 30 (B, C, D).

To be able to exercise initiative over [).

xii) Estimation of moving direction and speed of mobile radio 150 (B, C, D>).

Next, by using the functions 1) to xiii) in combination, the following applied functions can be provided.

1> The ID/roam area information collation storage unit 5 checks the radio channels used by other mobile radios or other radio base stations operating in the vicinity of the own mobile radio 50 (B, C, D).
4 and used when making a call or switching communication channels.

2) As one application of the functions of

3) Using the functions of i), vi), and viii), set the optimum transmission level for the own mobile radio device 50 (B, C, D).

4) One application of the function in 3) is to determine the optimal signal speed for digital signal transmission.

5) Determine the optimal channel to use depending on the type of communication (telephone, fax data, etc.).

In addition, the control m+ function accompanying the transition to another zone is as follows: 6) New wireless base station 30 (B,
C, D, E) selection. At this time, the mobile radio device 50 (B,
C, D)), the new wireless base station 30 (
Select B, C, D, E).

In particular, in the case of high-speed mobile networks, the IDs of the subsystems with which it has been communicating are searched, a new subsystem with which to communicate is determined based on rules that follow certain rules, and the radio base belonging to that subsystem is searched. Station 30 (B, C, D, E
) selects available control and speech channels for communication with

7) For the gateway switch 20, the wireless base station 30 (
Opening/closing the switch group 23 of the communication path and requesting parallel use of the communication path via (B, C, D, E).

8> Mobile radio equipment 50 (B, C, D> A function to recognize that the mobile radio device itself is in high-speed movement mode, which will be described later. In that case, transmit/receive diversity or an increase in the number of retransmissions of control signals, etc. should be applied. and the wireless base station 30 (B, C.

D, E) and the gateway exchange 20 to that effect, and has the function of changing the system operation to high-speed movement mode.

To express the above control function in one word, it means that a part of the function of the radio network control station 12 in FIG. 9 used in the prior art is accommodated in the mobile radio device 50 (B, C, D>). This becomes possible only by using VLSI technology, which has recently made remarkable progress, and can be described as making mobile radio equipment intelligent.

However, even if mobile radio equipment is made intelligent using conventional technology, there are limits to its effectiveness.
In particular, it has no effect on improving radio line control ability or eliminating instantaneous interruptions when switching channels during a call, and it is only through the use of the method of the present invention that it becomes intelligent in both name and reality.

(B) Wireless base station 30 (B, C, D, E) Devices each having the following functions are set in the wireless base station 30.

a) Each radio base station has a dedicated radio transceiver for transmitting and receiving a small number (usually one) of control channels, and a number of dedicated communication channels corresponding to the number of communication channels assigned to that radio base station. A wireless transmitter/receiver is installed.

For example, assume the wireless base station 30C in FIG. 1E. 1
The number of communication channels to be allocated to one wireless base station 300 is determined by the number of communication channels that should be allocated to one wireless base station 300.
(B.

The optimum value is given by the call traffic of C, D>.

If the area of the zone is large and there are many mobile radios in the area, the call traffic will inevitably increase, so at least one control channel and multiple call channels are required, and the transmitter/receiver 90 (Figure 1F)
Naturally, a plurality of numbers are required. In the case of a large group, the car telephone system of NdingT has 2 control channels and up to 6
There is an actual example in which a communication channel of about 0 tunnel is allocated.

However, the size of the zone gradually became smaller, and finally, the above-mentioned document, Ito "Proposal of a mobile phone system" Communications Society of Japan Communication Systems Research Joint Venture n C386-88 November 1986
As shown on the moon, when it comes to a very small zone with a radius of about 25 meters, the wireless base station that handles this area as a service area has to control the wireless channel installed there from the viewpoint of call traffic, method, and cost. In some cases, the number of calls and calls are counted as one, and the function of the radio that covers these is one transmission and reception. In other words, one transmitter/receiver is used for both control and communication (the first
(See Figure D). What's more, this dual-purpose system is different from the conventional system in that when a call is made from a certain mobile radio, it is initially handled using the control channel, and after specifying a free call channel, it also changes to the call channel itself and repeats the same call. Rather than the intermediate method of communicating with a mobile radio, as will be explained directly, even during communication using one mobile radio and a communication channel, it is possible to interfere with the radio frequency signals being transmitted and received, as will be explained later. By repeatedly switching the communication channel and the control channel at a switching speed that does not affect the communication speed, it is possible to accept calls and make calls to the mobile radio device 50 (B, C, D>) that requests new calls. A feature of the present invention is that it has an excellent function of

As explained above, the wireless base 830 (B, C.

Various cases can be considered for the configurations D and E), and the present invention is applicable to all of them.

However, in the radio base station 30 of FIG. 1A, only one set of transmitter/receiver is shown, and the rest are omitted.

b) The transmitter/receiver dedicated to communication channels installed in each wireless base station 30 (B, C, D, E) transmits one of the few wireless channels among the wireless channels assigned to that wireless base station. Of course, it is possible to receive channels, but in zones with severe fluctuations in i~RAHic,
It is assumed that the 1g transceiver 90 installed in the wireless base station 30C (FIG. 1E) has a configuration as shown in FIG. 1F.

That is, the configuration of the portion that transmits and receives radio signals is substantially the same as that of the mobile radio device 50 shown in FIG. 1B.

As a result, the call traffic in this zone increases, and even in the wireless base station 30C where m transmitters/receivers 90 are installed for normal m-channel communication, due to the increase in call traffic, m-channel or more communication When communication becomes necessary, the synthesizer 35 currently in operation is transmitted by a control signal sent from the control unit 38G in the base station to one transmitter/receiver 90 configuring the wireless base 830C.
35-2.35-3. ... 3
5n and 36-2.36-3. ..., 36-n and changeover switches 44-1 and 44-2 are operated. As a result, what was previously possible to transmit and receive using m channels becomes possible to transmit and receive using up to m×n channels. The number of channels that can be used simultaneously increases dramatically.

However, the transmission power of each channel will decrease depending on the number of switches unless a power amplifier is installed at the output of the transmission mixer 61, so it is necessary to pay attention to this point, and the total number of channels given to the system will decrease. It becomes the upper limit. Alternatively, if you want to cause interference to channels communicating in other zones, the limit will be lower than that number. Figure 1L and 1
The transceivers 90B and 90G shown in Figure M are highly effective in reducing or eliminating such technical problems.

The radio base station 30B in FIG.
0 (Even during communication using communication channels with B, C, D>, the communication channel and control channel are repeatedly switched at a switching speed that does not interfere with the transmitting/receiving radio frequency as described above. By doing so, it is possible to accept the call operation and make it possible to make and receive a call even for the mobile radio device 50 (B, C, D) that newly desires to make and receive a call.

Hereinafter, it will be further explained using Fig. 1F, but Fig. 1C,
Radio base station 30.30 in Figure 1D, Figure 1J, and Figure 1
The functions of the wireless base station 30C equipped with the transceivers 90B, 30E, 30D, 30E and the transceivers 90B, 90C shown in FIGS. 1L and 1M are also substantially the same.

The control unit 38C has the following basic functions.

i) Transmission/reception 190 included in own wireless base station 30C
commands the transmitting unit 31 to start or stop transmitting radio waves, and controls the transmission power level.

ii) Instructing the receiving unit 33 of its own wireless base station 30C to receive or stop radio waves.

1ii) Notify the gateway exchange 20 whether dial signals can be sent or not, and whether voice transmission and reception can be done or not.

iv) Synthesizer groups 35-1 to 35-n and 3
Excavation frequency (channel) designation, excavation command and stop command for 6-1 to 36-n.

V) For the reception and transmission switching controller 45.47,
Control command.

vi) Determining whether or not to change the used channel X7 based on information from communication quality monitoring receivers 93-1 to 93-m, and transmitting quality information to mobile radio device 50 (B.

Determine whether or not to transmit to C, D>.

vii) Determining whether or not to change the channel to be used based on information from the interference detector 42.

viii) Confirmation of the ID of the other party to communicate with and determination of the channel to be used based on the information from the ID identification storage unit 34C.

ix) Based on a request from a mobile radio with a higher service type, mobile radio 1150 (B.

Aim to end communication with C, D> early. Or terminate immediately.

×) For reception and transmission switching controller 45.47,
Determination of on/off duty conditions.

xi) Regarding control decisions, mobile radio 50 (B.

Must be lower than C, D>. This is to transfer the initiative to the mobile radio R50 (B, C, D> when the mobile radio 50 (B, C, D>) is different from the control decision. However, xi) is determined for convenience of explanation; in actual systems, wireless base station 3
0 There is no problem in giving initiative to (B, C, D, E) (it is possible to implement).

xii) As already explained in a) and b), in the case of a radio that serves both a communication channel and a control channel, (
A> The mobile radio device 50 (B, C.

Similarly to D), as shown in FIG. 1D, it has a plurality of synthesizers 35-1 to 35-n, 36-1 to 36-n,
By repeatedly switching the communication channel and the control channel at a switching speed that does not interfere with the radio frequencies for transmitting and receiving signals, the mobile radio 150 that wishes to make and receive new calls (
It must also have the function of accepting calls to and from phones B, C, and D, and making it possible to make calls.

Next, by using the functions i) to xii) at a later date, the following applied functions are provided.

1) Storing radio channels used by other radio base stations operating in the vicinity of the own radio base station 30 (B, C, D, E) and other mobile radio devices in the ID identification storage unit 34C. Use this when making a call or switching channels during communication.

2) As one application of the functions x) and xi), when call traffic is congested, suppressing calls, disconnecting channels in use, or recommending early termination.

3) Using the functions i), vi), and vii),
Setting the optimum transmission level in the own radio base station 30.

4) One application of the function in 3) is to determine the optimal signal speed for digital signal transmission.

5) Determine the optimal channel to use depending on the type of communication (telephone, fax, data, etc.).

In addition, the control functions associated with transition to another zone include: 6) Mobile radio device 50 (B,
Based on the signals from C, D), communication of reception quality data and new wireless base station 30 (B, C).

If selected as D or E), start communication.

7) For the barrier switch 20, the mobile radio 50 (
Based on requests from B, C, and D), opening/closing the switch group 23 of the communication path and requesting parallel use of the communication path.

8) After carrying out channel switching during a call, the ID and call channel number of the mobile radio device 50 (B, C, D>) with which communication has been performed is stored for a certain period of time.

9) Each radio base E30 that received the location registration signal (control channel used) from the mobile radio R50 (B, C, D)
Based on the report from (B, C, D, E), the ID (self-identification information) of the mobile radio device 50 (B, C, D) is transmitted via the communication path control unit 21 included in the barrier exchange tXN 20. and stored in the ID identification storage section 24. In this case, in the present invention, since a location registration request is made from a plurality of radio base stations 30 (B, C, D, E), mobile radio 1150 (B, C,
The quality of the signal received in D) (decibel values such as S/N and C/N) is also stored.

10) Each radio base station 30 that received a calling signal (control channel used) from the mobile radio device 50 (B, C, D>
Reports from (B, C, D, E) are also recommended, as well as the 30 best wireless base stations with the best received signal quality and the next best wireless base stations.
(B, C, D, E) or mobile radio 50 (B, C
, D>, the wireless base station 30 (B, C, D,
Select E).

In response to this, the mobile radio 50 (B) selects one of the radio channels assigned to that radio base station.

Specify the currently unused communication channel number to be used for communication with C, D>. For wireless base stations with degraded communication quality, mobile wireless devices 50 (B, C, D
) sends a command signal to stop communication with.

11) Mobile radio device 50 in high-speed movement mode
Regarding location registration from (B, C, D), making/receiving calls, and channel switching during a call, there is a function to confirm the same, a function to apply transmitting/receiving diversity, and a function to apply the transmitting/receiving diversity.
(B, C, D> and the mobile radio 50 at the barrier switch 20)
(B, C, D> is in high-speed mode, or instructs the mobile radio device 50 (B, C, D> to apply transmitting/receiving diversity, etc.).

However, it goes without saying that diversity transmission and reception is not applied to the radio base station 30 shown in FIG. 1C.

To express the above control function in one word, some of the functions of the radio network control station 12 shown in FIG.

D, E) and mobile radio equipment 50 (B, C, D>), it is possible to accommodate all the functions of the radio network control station 12, and the radio network control station 12 can be abolished.

However, even if the wireless base station 30 is made intelligent using conventional technology, there is a limit to its effectiveness, especially when it comes to improving the ability of wireless line control and eliminating instantaneous interruptions when switching channels during a call. is completely ineffective, and it is only by using the method of the present invention that it becomes intelligent in both name and reality.

(C) Kanmon Exchange II! 1120 The barrier switch 20 having the configuration shown in FIG. 1A is a mobile radio device 50 in the mobile communication system according to the present invention.
(Function of the ID identification storage unit 24 to store position information of B, C, D>), mobile radio 50 (B, C, D) Set up a communication route between Aizu, and control the communication route control unit 21. The communication path control unit 21 executes the control to open and close the switch group 23 and sets the communication path for calls to and from the mobile radio devices 50 (B, C, D> in the mobile communication system and the telephone network 10 outside the system). The controller is in charge of opening and closing the switch group 23 under the control of the controller.

The functions of the barrier switch 20 will be explained in detail below.

a) Execution of the operation of the switch group 23 to be opened and closed in connection with the call originating from the mobile radio 50 (B, C, D>, and if the called party is included in the telephone network 10, the barrier Transmission of information necessary for setting up a call with the called party addressed to the exchange 20.

b) An incoming call signal to mobile radio II 50 (B, C, D> is sent from a calling party included in the telephone network 10 to the gateway switch 20
When the communication is transmitted via the communication path control section 21, the switch group 23 to be opened and closed is operated, and the I/O
Called mobile radio IJ50 by searching D identification storage unit 24
(Check the current position of B, C, D>.

The ID identification storage unit 24 stores the positions of all the wireless base stations 30 (B, C, D, E) under the gateway exchange 20, and also stores the positions of all the wireless base stations 30 (B, C, D, E)
All mobile radio devices 50 (B, C,
D) position is stored. Wireless base station 30 (B, C
, D, E), etc., and is suitable for communicating face-to-face when mobile radio devices (B, C, D> are installed in a car and communicate. It has a function to separately manage the base stations 30 (B, C, D, E) as radio base stations for high-speed movement mode.

The service areas where high-speed travel mode occurs are:
Expressways, major arterial roads, general roads, etc. can be considered, but
In these areas, multiple subsystems have an overlapping zone configuration, and the wireless base stations 30 (B, C, D, E) belonging to each subsystem have common identification information and wireless base stations. Station 30 (B, C, D, E
>Owned in conjunction with own identification information. moreover,
Each subsystem has self-identification information (ID) as described below.
) in order along the road, for example 1, 2° 3.4.・
..., m, m+1. It is given according to certain rules such as... Therefore, the mobile radio devices 50 (B, C, D) in high-speed movement mode determine which subsystem to communicate with next after switching the channel during a call, based on the ID of the subsystem currently communicating and the ID of the subsystem with which it was communicating before. Since the ID of the subsystem to be called can be predicted and the control and communication channels available for that subsystem are memorized, channel switching during a call can be smoothly performed even when moving at high speed. is possible. In addition, it becomes possible to allocate radio channels usable in each subsystem, taking into consideration that radio interference will not occur in adjacent zones.

The barrier exchange tjN20 has a function of giving advice to the mobile radio device 50 (B, C, D>) in such a state.
It has a function to separately manage D>.

C) In connection with an incoming call to the mobile radio device 50 (B, C, D), the radio base station 30 ( B,
Instruction to send a call signal to C, D, E). First, this calling signal is sent to the mobile radio 50 (B.

C, D> is sent to all the radio base stations 30 (B, C, D, E) whose current location is registered, and each radio base station 30 (B, C, D, E) that receives the , and send out incoming call signals addressed to mobile radio equipment 50 (B, C, D>) at the same time using the downlink control channel.

However, this transmission time does not necessarily have to be the same time, and may be transmitted sequentially in chronological order for each radio base station 30 (B, C, D, E). In other words, it is only necessary to take measures to avoid interference caused by signal time differences.

d) Mobile radio 50 (B, C, D> starts a call,
If the communication traffic situation within the system allows, determine whether to implement transmit/receive diversity and instruct the execution of the operation.

e) Mobile radio device 50 performing transmitting/receiving diversity
Regarding (B, C, D), if there is traffic congestion, an important subscriber makes a call, or a broadband signal service applicant appears at that time, the multiplicity of transmitting and receiving diversity (number of channels used) will decrease or , Determining and executing diaperity stopping.

f> According to items a) to e), the mobile radio device 50 in communication
(B, C, D> may be within the same zone or change zones as the location moves and the wireless base station 30
If the communication quality with (B, C, D, E) deteriorates, it is determined whether to switch the channel during communication (busy) for that channel. Note that in order to perform this operation, it is necessary to send a control signal to the opposing radio base station 30 (B, C, D, E), and this instruction (control signal) is shown in FIG. 2 (a).
), this is done using a communication channel and a frequency band above or below the frequency band of the communication signal.

g) By moving the mobile radio equipment 50 (B, C, D>), each radio base station 30 (B,
C, D, E))
0 (B, C, D>) to estimate the moving direction and speed of the mobile radio 50 (B, C, D>), while the separately investigated mobile radio R (B, C, D>'s The traffic status (communication channel usage status) at the wireless base stations 30 (B, C, D, E) in the direction of movement is comprehensively judged, and if necessary, the traffic status of the wireless base stations 30 (B, C, D, E) is
C.

It is determined and executed whether the multiplicity of the transmitting/receiving diversity of the mobile radio device 50 (B, C, D>) which is communicating with D, E) is gradually decreased or increased.

h) A mobile radio device 50 (B,
Regarding the location registration 2 originating/incoming calls 2 call switching from C, D), the confirmation function and the radio base station 30
(B, C, D, E) and mobile radio lm50 (B, C,
T) has a function that instructs that transmission/reception diversity or an increase in the number of control signal listens should be applied to D).
jvru.

Next, the operation of the entire system will be explained in terms of the following items.

(1) Location registration (2) Calling operation (3) @Call operation (4) Application of diversity during low traffic times (5) Explanation and rationale for channel switching during a call and the diversity effect.

(6) Communication channel allocation method for estimating the moving speed of mobile radio equipment and taking measures against traffic congestion.

(7) Location registration method of mobile radio device moving at high speed and operations such as making/receiving calls (1) Location registration mobile radio device 50 (B, C, D> home area where it is permanently installed, or other than the home area) In the ROHM area, which is the area within the service of
When the power switch is turned on to start operation, the first thing that is performed is a location registration operation. The flow of this location registration operation is shown in FIG. 4 and will be explained.

When the power switch of the mobile radio 150 (B, C, D> is turned on, a location registration signal is sent to a nearby radio base station, for example 30- 1 to 30-n (S
201, Figure 4).

Upon receiving the location registration signal from the mobile radio device 50 (B, C, D) (3202>, the radio base station 30 (B,
In C, D, E), the reception quality is inspected and the ID is stored in the ID identification storage unit 34 (3203>. If the result of inspecting the reception quality is above a certain value (S204 YES)
, sends a location registration request signal together with reception quality data to the gateway exchange 120 (3205>. This registration request signal is received from a plurality of wireless base stations 30 (B, C, D, E) (3206> 20, the mobile radio 5
0 (B, C, D> ID is inspected, ID identification storage unit 2
If it is determined that the location registration can be accepted after checking the contents of 4, the location is registered including the reception quality (320
7>.

Similarly, in the barrier switch 20, a plurality of wireless base stations 30-1
~30-n registers that the reception quality and location are stored. When this registration process is completed, there will be no registration completion signal! ! Base station 30 (B, C.

D, E) (3208>. This registration completion signal was received (209> Wireless base station 30 (B, C
, D, E>, the data is transferred to the mobile radio device 50 (B, C, D>) using the downlink control channel (S210>.

Registration completion signal received (3211>Mobile radio 50
(B, C, D) is the ID (identification number) of each wireless base station 30 (B, C, D, E>) that was registered after inspecting the received content.
is stored in the ID Roam area information verification storage unit 54 (
3212>.

With the above operations, the location registration operation is completed and the device enters a standby state for an incoming call.

Incidentally, as is clear from the above description, the mobile radio device 50 (8,C) of the mobile communication system according to the present invention.

D) Location registration differs from conventional systems in that registration is performed at multiple locations (in units of wireless base stations).

This represents one feature of the present invention.

Furthermore, when storing location registration information, the radio base stations 30 (B, C, D, E) and the gateway exchange 20 store the location σ sent from the mobile radio device 50 (B, C, D).
The quality of the recording signal is measured and stored including the first shift. Therefore, for example, in the barrier switch 20, the mobile radio 50
Wireless base station 30 (B, C, D, E) whose reception quality was high to store the location registration signal of (B, C, D)
For example, they are stored in order of receiving quality as shown below.

Table 1 Seed line star fraud W 肱凰穆 1 and Emperor present Anal cutting date 10 1D S/N (C/N) Hours, minutes, seconds 30-1 50 50 1988.
8,1113,24.56 30-2 50 45 1988.8,
1113, 24.56 30-3 50 35 1988.8,
1113, 24.56 30-4 50 30 1988.8,
1113, 24.56 30-5 50 25 1988.8.
1113, 24.56 Similarly, each radio base station also has the radio base station 30 (B, C.

It stores not only the information received by stations D and E) but also the information received from surrounding wireless base stations as shown in Table 1. This is useful when performing channel switching during a call due to the movement of the mobile radio 150 (B, C, D) when a communication path is established between the mobile radio 50 (B, C, D>). Not only is this information useful, but also the mobile radio 50 ([3,C,
This is because it is necessary to estimate the moving direction, speed, etc. of D>.

For the same reason as above, mobile radio equipment 50 (B, C,
The ID roam area information collation storage unit 54 in D) also stores the same information as in Table 1.

Next, when the mobile radio device 50 (B, C, D> is on standby (not talking), moves from the zone where the location was registered,
Suppose that it has moved to an adjacent zone. Recognition of this movement is performed by, for example, the wireless base station 30 (B, C).

In a system in which control signals are constantly being sent from stations D and E, the radio base station 30 included in the received control signal
Move the IDs of (B, C, D, E)! 71 Wireless 150 (B
, C, D> r written tlT(+' can be identified by comparing it with the ID.

In a system in which the wireless base stations 30 (B, C, D, E) do not always send control signals, the mobile wireless devices 50 (B, C, D) transmit signals from the surrounding wireless base stations 30 (B, C, D) at predetermined time intervals. A downlink control signal transmission request is made to each radio base station 30 (B, C, D, E) using an uplink control channel, and in response to this request, each radio base station 30 (B, C.

This is possible by comparing the ID of the radio base station 30 (8°C) sent from the mobile radio device 50 (B, C, D) with the ID information stored in the mobile radio device 50 (B, C, D).

In any of the above systems, among the ID information of the wireless base 7430 (B, C, D, E) obtained as a result, the mobile wireless device 50 (8, C).

If it is discovered that there is at least one new base station ID information different from the base station ID information stored in step D), the mobile radio 50 (B, C.

D) is determined to have moved to a new zone, and the control unit 58
(B, C, D> (see FIG. 1B) updates the location registration in the ID roam area information verification storage unit 54.

In other words, the mobile radio 50 (
B, C, D> ID information is sent to the surrounding wireless base station 30 (B
, C, D, E).

A plurality of wireless bases 830 (B
, C, D, E), perform the same procedure as already explained and send the mobile radio 50 (B, C,
D>'s location registration signal is sent.

Upon receiving this signal, the gateway exchange 20
The mobile radio device 50 (B, C
,D), the conventional information is replaced with new information. As a result, mobile radio TA50 (
The location registration of B, C, D> is updated.

The above update work is necessary because the mobile radio 50 (B, C, D>) is in standby mode, and if you move to a new zone during communication (talking), the gateway exchange 12
0, the new wireless base station 30 (B
, C, D, E) and the mobile radio 150 (B, C, D>), the location registration is updated at the same time, so no special operation is required.

Note that in a system where the number of radio devices installed in the radio base stations 30 (B, C, D, E) is small and the radio devices for control channels are diverted to communication channels, the radio base stations 30 (B, C, D, E) or other mobile radio 50 (B
, C, D>, using the conventional technology, there are no other mobile radios on standby, so even if a location registration request is issued from another mobile radio, the call will be considered invalid. It had become. However, as a configuration of a mobile radio device, for example, as shown in FIG. 1B, a plurality of synthesizers 55-1 to 55-n,
56-1 to 56-n and changeover switches 641, 64-2, etc., the transmitting/receiving channel is repeatedly switched without chopping, even if the mobile radio is already communicating with another mobile radio. It is possible to communicate with a newly received mobile radio via the control channel. Therefore, it becomes possible to accept location registration. Note that location registration from the mobile radio 1150 (B, C, D>) in high-speed movement mode will be described later.

(2) Calling operation The calling operation from the mobile radio 50 (B, C, D) will be explained.

It is assumed that the mobile radio devices 50 (B, C, D) are powered on and the location registration described in section (1) has been completed. The calling operation when calling a mobile radio in the same system from a mobile radio 50 (B, C, D) or a telephone accommodated in the telephone network 10 shown in FIG. 1A is currently performed as follows. Dial operations are performed in the same way as making a call from an existing car phone.

Now, the user lifts up the handset (hang-off) of the telephone section 59 of the mobile radio device 50 shown in FIG. 1B. In this state, the mobile radio determines at what timing the calling signal sent from the mobile radio 50 should be sent to the uplink control channel (from the mobile radio 50 to the radio base station 30 (B, C, D, E)). The control unit 58 of the radio device 50 knows this. This is a downlink control channel (radio base station 30 (B.

This is because the mobile radio device 50) f has been captured by the mobile radio device 50) from C, D, E) and recognizes the timing when the control signal contained therein is available for calling.

Also, in mobile radio t150, all functions shown in FIG. 1B are active. Especially synthesizer 55-1.55
-2. ..., 55-rl is made to prepare for local oscillation frequency oscillation, but the selector switch 64-1 is kept fixed at the position where the synthesizer 55-1 is selected. Further, the control unit 58 sends a control signal to the synthesizer 55-1 to oscillate a locally excavated frequency for receiving the downlink control channel. On the other hand, radio base stations 30-1, 30-2. ..., 30-
In n, if there is only one radio device in the radio base station, the next operation is to receive the uplink control signal from the mobile radio device 50 depending on whether it is communicating with another mobile radio device or not. I am working on it.

First, at the wireless base station 30 (B, C, D, E) that is communicating with another mobile wireless device at that time, the wireless base station 30 (B, C, D, E)
(B, C, D, E) Reception and transmission switching controller 650.67C1 and synthesizer 55-1.55-
2.56-1.56-2 are in operation, of which 55
-1.56-1 outputs the local oscillation frequency necessary for communication with other mobile radios, and synthesizers 55-2 and 56
-2 outputs a local oscillation frequency that requires communication on the control channel. Therefore, the radio base station 30 (8, C
, D, E) remain ready to respond to calls from 50 immediately.

Next, the radio base station 30 (B, C, D, F
), the reception state of the radio reception circuit 68 is fixed so that it can receive the control channel. Therefore, the wireless transmitting circuit 66 and the like are inactive, and only the wireless receiving circuit 68 and synthesizer 55-1 are in operation.

Now, under the above conditions, the mobile radio device 50 transmits a call request signal. This call request signal including the ID of the mobile radio device 50 is created by the control unit 58 in FIG. 1B,
The signal is sent to the wireless transmission circuit 66. The radio transmission circuit 66 adds modulation, amplifies it to an appropriate level, and sends it to the transmission mixer 6.
1, the signal is added to the antenna and sent to the wireless base station 30-1, etc.

The radio base station 30-1, etc. that has successfully received this signal inspects the content of the received signal and sends the radio base station 30-1
It is stored in the ID identification storage unit 34 of the mobile radio 50 that has completed location registration, and the reception quality value and empty channel number received at the radio base station 30-1 are confirmed. In addition, a reply is sent to the mobile radio device 50 that made the call, requesting the mobile radio device 50 to determine the communication channel number to be used. If the mobile radio is not stored in the storage unit 34 of the radio base station 30-1, it is stored at this point and the added information is returned to the mobile radio 50. However, in this case, the timing of the reply is related to the reception quality as described above so as not to interfere with replies from other radio base stations.

On the other hand, the wireless base #30-1.302 around these...
・The mobile radio device 50 which received the response signal from 30-n
Now, considering the call traffic status at that time,
Determine the number of wireless base stations for diversity transmission and reception. That is, radio base stations 30-1, 30-2.・、30
- inspect the contents of the response signal from n, and select mobile radio 1150 from among those whose call quality satisfies a certain standard.
The wireless base station 30-1.30 is selected based on the moving direction and speed of the wireless base station 30-1. -2 to 30-
Suppose you decide to communicate with ml. In this case, the mobile radio 1ff50 uses the uplink control channel to notify the radio base stations 30-1, 30-2, 30-n of the communication channel numbers to be used, and waits on the channel with the same number. request.

These radio base stations 30-1, 30-2. ..., 30-
n, each of the radio base stations 30-1 to 30-n reports that it is on standby in the designated communication channel at the timing designated by the control signal.

There is no problem even if the reports (transmissions) from the plurality of radio base stations 30-1 to 30-n described above to the mobile radio t150 are sent at the same time. However, in this case, each radio base station 30 (B, C, D
.

The flow of the above calling operation is shown and explained in FIGS. 5A and 5B. However, only one radio base station 30 (30-1>) that communicates with the mobile radio device 50 is shown as a representative.The barrier exchange 1120 and the radio base station 30-1 have already started operation, and the mobile radio device 50 also started working, and the 4th A
The location registration work described in FIGS. 4B and 4B has been completed.

The handset is picked up (off-hook), and this off-hook signal and the ID (identification number) of the mobile radio 50 are sent out using the uplink control channel (CH) (3231).
, Figure 5A).

Upon receiving this, the wireless base station 30-1 transmits the mobile wireless device 50.
, and confirms that the ID is already stored in the ID identification storage section 34 (S232>).

Therefore, the radio base station 30-1 adds the reception quality #i received from the mobile radio device 50 and the current empty channel number, and sends it as a call response signal using the downlink control channel (3233>).

The mobile radio device 50 that has received such call response signals from the plurality of radio base stations 830 examines the value of reception quality from each radio base station 30, and selects a radio base station 30-1 that is capable of diversity transmission and reception. ~30-n is selected, an empty channel is checked (3234), and a signal specifying the communication channel to be used is sent (3235). Here, radio base E3
For channel 01, channel C1''1 is sent. The wireless base station 30-1 confirms that the communication channel specified by the 1gJ device 50 before movement is free, switches to that channel (3236>, and sends a channel switching completion report using the downlink control channel. (S237). Upon receiving this switching completion report (3238), the mobile radio device 50:
Wait for dial tone on specified call channel (32
39>.

On the other hand, the radio base station 30-1 sends a calling signal to the gateway exchange 20 (3240>. Upon receiving this, the gateway exchange 120 sends the ID of the mobile radio 50 and the communication quality to the I/O.
The D identification is stored in the storage unit 24, and the switch group 23, for example 5W1-1, is turned on under the control of the communication path control unit 21 to connect the wireless base station 301 to the exchange 11 of the telephone network 10 (S241).

Therefore, a dial tone is sent from the exchange 11 side via the switch group 23 of the barrier exchange 20 (324
2, Figure 5B).

This dial tone is transferred by the radio base station 30-1 through channel CH1 (downlink) (S243), and received by the mobile radio 50, confirming that a call has been set up (S244>.Moving The wireless t150 sends out the dial signal of the destination using the channel C11 (upstream) 3245>, which is transferred by the wireless base station 30-1 (3245).
246>, one exchange operates and calls #l! A communication path to the destination No. 110 is set up (3247>).The intrusion call is made (3248).

When the call is completed, the handset goes on-hook (3
249>, the on-hook signal and end-of-call signal are sent to the mobile radio 5
0 using channel Cl-11 (upstream) (3250). As a result, the radio base station 30-1 confirms the end of the call (5251) and notifies the gateway exchange 120 of the end of the call.

Therefore, the barrier switch 20 turns off the switch 5W1-1 of the switch group 23, and the call ends (3252>).

Note that the mobile radio device 50 (B.

The call originating from C, D> will be briefly described.

(3) Incoming call operation The present invention has been described with respect to calling from the mobile radio 11150 (B, C, D>, but below, the mobile radio 50 (
The flow of operations for incoming calls to B, C, [)) will be explained using FIGS. 68 to 6C. Here, among the many radio base stations 30, 30-1 is shown as a representative. For example, a mobile radio device 50 or the like existing near the N-line base station 30-1 is on standby on a control channel that is commonly used by all radio base stations 30.

In FIG. 1A, it is assumed that an incoming call signal addressed to the mobile radio 50 enters the barrier switch 20 from the telephone network 10. It is assumed that the ID identification storage unit 24 in the barrier switch 20 inspects incoming call signals and searches for the ID of the called party, and finds the wireless base station 30 (plurality) whose current location is registered. . Then, the mobile radio device 50 simultaneously sends an incoming call signal to all the radio base stations 30 whose locations are registered via the communication control unit 21 (3271, FIG. 6A).

Each radio base station 30 that received this signal
When searching the D identification storage unit 34 (C) and confirming that the ID of the mobile radio 150 is stored there, a request is made to the mobile radio 50 to receive a call and specify a call channel using the downlink control channel. ID of wireless base station 30-1
is added and sent.

Similar operations are performed on other radio base stations 30 so that the mobile radios 50 are not called at substantially the same time (S272).

On the other hand, this incoming call signal is received by the mobile radio device 50 that is on standby on the control channel, and after searching the received signal quality and signal content and confirming that it is the incoming call signal addressed to the mobile radio device 50. (3273) The mobile radio 1150 selects each radio base station 30-1 .
30-2. ..., determines a communication channel that can communicate with 3Q-n, and uses the uplink control channel to communicate with the wireless base station 30.
-1.30-2. −． Send to 30-n (3274
>.

At the same time, each synthesizer 55-1.55-2 and 561.56-2 in the mobile radio 50 (FIG. 1B)
．． ..., 56-rl switch 64-1.64-
2 and the reception and transmission controllers 65G and 67G are operated, for example, the communication channel CH1 (wireless base station 3
0-1), communication channel C)-12 (wireless base station 30
-2),...

The communication channel n (for wireless base station 30-n) is brought into a state in which transmission and reception are possible. Each of the radio base stations 30-1 to 30-n that received the uplink control channel from the mobile radio 50 inspects the quality of the received signal, confirms the ID of the mobile radio 50 that transmitted the signal (3275), and transmits the received signal. A call response signal is sent to the barrier switch 20 (3276>).

This incoming call response signal to the gateway exchange 20 also includes a signal to the switch group 23 for setting a communication path. Then, upon receiving this incoming call response signal, the barrier exchange 120:
It is checked whether the ID of the mobile radio device 50 is already stored in the ID identification storage unit 24, and if it is not stored, the ID is stored in the ID together with the quality inspection data of the radio base station 30-1.
It registers in the D identification storage unit 24 (3277), and sends a response confirmation signal including the stored ID etc. to the wireless base station 301 etc. (3278>).

Upon receiving this response confirmation signal, the radio base station 30-1 confirms that the ID of the mobile radio 50 has been correctly registered (5279) and checks whether the channel specified by the mobile radio 50 is free. Please consider whether or not to switch.
280. 6B), and sends the resulting switching approval/disapproval signal to the mobile radio t150 on the downlink control channel (3
281).

If this switching approval/disapproval signal is received (3282), the mobile radio 4m50 does not allow switching of the specified channel because there are no free channels.
O) Return to step 5274 and specify another communication channel (8274>. If the specified channel is an empty channel and switching is approved (3283Y
ES), switches to that channel and sends a channel switching completion report using the uplink control channel (3284>
.

Confirmed that the channel was switched to a free channel (3285
) The wireless base station 30-1 switches to this channel and
A channel switching completion signal is sent to the barrier switch 20 (3286).

When the barrier switch 1120 receives the channel switching completion signal, it operates the call path control unit 21 and switches the switch group 2 in order to set up a call path to the telephone network 10 via the exchange 11.
For example, turn on 5W1-1 of 3, and connect the wireless base [30
-1 and the telephone network 10 (8287>. Then, a calling signal is sent from the telephone network 10 side via the barrier exchange Vs20 (3288, Fig. 6C), and this is transmitted to the wireless base station 3.
0-1 (3289>).Then, a calling bell signal is sent on the set communication channel CH1, and the mobile radio 5
Generates a ring tone at 0 (3291>).

When the handset on the mobile radio 50 side is lifted (off hook) due to this ringing tone (3292>, channel C
An off-hook signal is sent at HI, and the wireless base station 30-
1 (S293>), received by the gateway exchange 20 (3294>), and a call is started between the telephone network 10 and the mobile radio 50 (S295).

When the call ends, the handset is put down and the on-hook signal and end-of-call signal are sent to the wireless base station 30 via channel CH1.
-1 (3296), and the wireless base 130-1, which confirms the end of the call, transfers this signal (3297). Upon receiving this on-hook message @ and the call termination signal, the barrier switch 20 operates the call path control unit 21 and switches the switch group 2.
3 turns off SW1-1 to end the call (S298>.

In the above explanation, even in a system in which the control transceiver installed in the radio base station 30-1 is diverted to a communication channel, the method of repeatedly switching the transmission and reception channels in time as explained in the configuration of the mobile radio device is also applicable. Therefore, even if the mobile wireless device is already communicating with the third mobile wireless device 1a, it is possible to communicate with a newly received mobile wireless device using the control channel (see FIG. 1D).

In the system exemplified in (2) call operation and (3) call reception operation described above, the wireless channels are clearly separated into a wireless channel dedicated to control and a wireless channel dedicated to calls. Ta. However, in some actual systems, this distinction is not clear. In such a system, it is possible to perform the same operation by using a specific communication channel as the control channel described above.

Note that the mobile radio device 50 (B.

C, D> will be described later.

(4) Application of diversity during low traffic times Due to the calling/receiving operations described in sections (2) and (3), communication between general telephone A and mobile radio 615 within the telephone network 10
0 (B, C, D> (or 2 in the system)
Assume that communication (between two mobile radio devices) has started. In this case, the mobile radio 50 (B.

Wireless base station 30 (B, C, D) with which C, D) communicates.

E) is one and the communication traffic state within the system,
It is assumed that the traffic state in the vicinity of at least the mobile radio equipment 50 (B, C, D) is not busy hour (radio base station 30 (B, C, D, E)).
) is 2 or more).

Then, the mobile radio devices 50 (B, C, D) start preparing to perform diversity transmission and reception. Therefore, taking the mobile radio device 50 (B, C, D) shown in FIG. 1B as an example,
The control section 58 sends an operation start command signal to each of the transmission switching controller 67C and the reception switching controller 65G, and also sends an operation start command signal to each of the transmission switching controller 67C and the reception switching controller 65G. n and 56-
so that the control channel CH30 can transmit and receive to and from
Request frequency oscillation.

At the same time, the control unit 58 starts sending control signals to the wireless transmission circuit 66. This control signal includes the mobile radio 5
0 (includes the ID of B, C, D>, the type of communication (type of voice, data, etc.), and the channel number currently in use, and the wireless base station 30 that is not currently in communication in the vicinity that received this)
Request (B, C, D, E) to start the diversity transmission/reception operation. However, the above wireless base stations 30 (B,
C,D.

The condition for E) is that if the wireless base station 30 (B, C
, D, E) in FIG. 1D or FIG. 1E.

If the configuration is as shown in Fig. 1F, Fig. 1J, Fig. 1, Fig. 1L, and Fig. 1M, even if the device is communicating with a third party's mobile radio, Since it is now possible to communicate with mobile radios, this condition can be relaxed.

As a result of the above operations, #1 aircraft 50 (B, C.

The output of the transmitting mixer 61 in D) includes 1q of signals transmitted by the control channel CI-150 in addition to the channel CH1 currently in communication, while the receiving mixer 63 receives 1q of signals in addition to the channel CH1 currently in communication. It also becomes possible to receive control channels. This is explained in detail in the operation of channel switching during a call in section (5).

The control signal transmitted from the mobile radio device 50 (B, C, D> is sent to the nearest plurality of radio base stations 30-
2.30-3. , 30-n. Then,
One of these, the radio base station 30-2, inspects the quality of the received signal and the signals, and as a result, the mobile radio 1150
(If the quality of the signal received from B, C, D> is above a certain value, and it is determined that the communication quality will not deteriorate immediately and there is no possibility of interference, A control signal including the ID of the wireless base station 30-2, an available wireless channel number @ (for example, CH2>, etc.) is sent to the mobile wireless device 50 (B, C, D).
, C, D) and reports that diversity transmission/reception is possible.

This signal is received by the radio receiving circuit 68 of the mobile radio device 50 (B, C, D>) and transmitted to the control unit 58. As a result of examining the signals, it was determined that it was appropriate to perform diversity transmission and reception, and the synthesizer 55-2
and 56-2 to generate a local oscillation frequency in order to start communication with the wireless base station 30-2 on channel CH2. In addition, to the radio base station 30-2, the switch group 2
3 to transmit the call signal currently being communicated to the wireless base station 30-.
2 is also requested to be sent in parallel.

In the barrier exchange 120 that received this request, the wireless base station 30
In accordance with the request of 30-2, voice signals, that is, voice signals from ordinary telephones, are transmitted not only to the wireless base station 301 but also to the wireless base station 30-2.
The same signal is also started to be sent to address 2.

The radio base station 30-2 that received this voice signal adds I[, etc. of the radio base station 30-2 to the mobile radio 50 (B, C, D>) and sends it out on the radio channel CH2. On machine 50 (B, C, D), radio channel CH2
The communication quality monitoring unit 57 inspects the output of the radio receiving circuit 68 that received this signal, and if the quality is good, the audio signal is transmitted to the telephone unit 59.
Then, the control signal is transmitted to the control section 5B.

By executing the above operations, the mobile radio device 50 (
B, C, D> will enter into a diversity transmission/reception state with the radio base stations 30-1 and 30-2.

The diversity transmission/reception execution request signal transmitted from the mobile radio device 50 (B, C, D) to the radio base station 30 (B, C, D, E) in the vicinity is transmitted to the radio base station 30. Radio station 30-3 outside -2J-4.30-4.
. , 30-n also receive the same response signal, and among these radio base stations that meet the conditions, the mobile radio 1450 (B.

C, D).

Therefore, the mobile radio 50 (B, C, D> system? 1B
When the fiS 58 or the barrier switch 20 wants to perform diversity transmission and reception with a larger number of wireless base stations, it performs the same procedure as when performing diversity transmission and reception with the wireless base station 30-2 described above. If all operations work properly, for example, the wireless base station 30-3
Diversity transmission and reception begins between.

Thereafter, the mobile radio device 50 (B, C
, D>, which is not currently in communication, and whose communication quality satisfies a certain standard required for the system or higher..., 30-n. Also, diversity transmission and reception is started in the same way. The multiplicity of diversity is determined by the radio base stations 30 (B, C) that can communicate.

D, E) or mobile radio 50 (B, C.

D) The number of multiplicities capable of simultaneous transmission and reception, that is, in the case of FIG. 1B, the synthesizers 55-1 to 55-
n or the number of n from 56-1 to 56-n.

Furthermore, in the above explanation, it is assumed that the call traffic in the system is not busy, but the traffic state may vary depending on the traffic condition of each radio base station 30 (B, C, D, E) or mobile radio device 50.
([3, C, D), and when the traffic is gradually congested, the multiplicity of diversity is sequentially limited, and at the busiest time, the multiplicity is 1, that is, there is no diversity. It will move to the state of However, by differentiating the reduction of multiplicity depending on the type of communication being carried out (voice, data, facsimile, etc.), it becomes possible to perform systematic processing such as making broadband communication less susceptible to multiplicity restrictions. The present invention has features such as being able to ensure good communication regardless of the type of communication.

(5) Explanation and theoretical roots of channel switching during a call and diversity effect n-1 radio base stations 30 (B, C, D, E) and one mobile radio 1150 (B, C, D> is communicating using n-1 channels, and if the communication quality on one of the channels falls below a certain value, the current communication that satisfies the certain communication quality Prior to switching to another channel (new channel) and communicating with one other wireless base station 30 (B, C, D, E) that is not currently connected, a switching receiving means and a switching transmitting means are used. is switched at a speed that does not affect the communication signal, and the old channel and new channel other than the n-2 channels that are continuously being transmitted and received are temporarily transmitted and received in parallel, while the quality of the new channel is changed. When it was confirmed that the current level was above a certain level, the channel switching operation was terminated and communication was started using n-1 wireless channels, including the new channel.Therefore, communication due to channel switching There are no longer any instantaneous interruptions.In addition, it is now possible to obtain transmitting and receiving diversity effects even when channel switching is not performed.

FIGS. 18 to 1M show system configurations for explaining an example of this operation. This will be explained below with reference to these figures.

The mobile radio device 50 (B, C, D> (hereinafter simply referred to as the mobile radio device 50) includes synthesizers 55-1, 55-2.
. . , 55-(n-1), the radio receiving circuit 68, and the radio transmitting circuit 66, the radio base station 30-1.30-2.
−． 30- (n-1> and communication channels CHI, Cl-
12,. It is assumed that communication is in progress using CH(n-1). It is assumed that the mobile radio tJ50 moves away from the radio base station 30-1 and approaches the radio base station 30-n. Then, as the relative distance between the mobile radio device 50 and the radio base station 30-1 increases, the call quality begins to deteriorate, and the communication quality monitoring unit 56 of the mobile radio device 50 detects this (
detects that the level has fallen below 1). Note that even the level L1 is set so that the line exceeds the required value.

The mobile radio device 50 connects all radio bases in the vicinity, Q30
(B, C, D, E) (hereinafter simply referred to as the radio base 830) is requested to measure the quality of the transmitted signal of the mobile radio 50. In response to this request, currently mobile radio equipment 50
Each wireless base station 30 that is not communicating with the mobile wireless device 50 or the gateway exchange Ia 20 reports the measured value.

In this case, the signal sent from the transmitting antenna of the own mobile radio device 50 is transmitted from the radio base station 30-1°3C)-2,-
, 30-(n-1>) while continuously transmitting communication signals addressed to base station 30-1.3 via the uplink (from mobile radio TA50 to radio base station 30) control channel (CH50).
0-2. ..., 3O-(n-1>), if the reception condition is good for the nearby radio base station (for example, 3O-n), the downlink (from the radio base station 30 to the mobile radio 50) control channel (CH50 ) to request a response.

The contents of the control signal sent from this mobile radio device 50 include:
Contains the signals shown below.

i> ID of mobile radio 1150.

ii) Partner wireless base station 30-1.30 currently being called
-2. , 30-(n-1) ID and reception quality.

1ii) Channel number currently in use.

iv) Type of communication (telephone, fax, data, etc.).

■) Service type.

A control signal including such content is received by a plurality of nearby wireless base stations 30.

That is, except when communicating with another mobile radio, these radio base stations 30 are on standby for reception on a control channel (for example, CH30) determined by each system, and each radio The base station 30 receives the signal. At the same time, the communication quality monitoring unit 36 installed in each radio base station 30 that receives this inspects the communication quality, and if it is above a certain quality*, the ID of the mobile radio 50 of the other party is sent to the radio base station 30.
0 in the ID identification storage unit 34 and the control unit 3
Notify 8. The contents of this notification include the following:

a> ID of the mobile radio device 50 that sent the message.

b) The partner wireless base station 30-1, 30-2. with which the mobile wireless device 50 is currently communicating. −． 30- (n-1) I
D.

C) Channel number in use.

d) Type of communication.

e) Reception status (S/N or C/N (carrier-to-noise ratio) or average bit error rate in the case of digital signals).

f) Service type.

Upon receiving this signal, the control unit 38 inspects the contents and
Searches for a communicable empty channel stored in its own wireless base station 30-n. As a result, if the mobile N-line 150 determines that there is an empty channel that satisfies the type of service desired and that the required communication quality can be secured for a certain period of time even after channel switching, the mobile N-line 150 30-n decides to notify the mobile radio device 50 of the reception status. For that purpose, firstly, the barrier exchange 20
to the communication path control unit 21 of the device itself, the ID of the mobile radio device 50 that transmitted the data, and the radio base #30-1, 30-2. ..., 3O-(n-1>I
D etc., and the switch 5W1-1 of the switch group 23
．． 1-2.1-n are turned on at the same time, and the wireless base station 30-1.30-2 is also turned on for the wireless base station 30-n.
．． ..., 3O-(n-1> (hereinafter abbreviated as 30-1, etc.) requests transmission of the same call signal. However, this operation will be explained later). It can be omitted if the modulation format of the signal is an amplitude modulated wave or shallow frequency modulation.

Next, the wireless base station 30-1 for the wireless base station 30-n
Regarding the transmission timing of the call signal in response to the same call signal transmission request, etc., the timing of transmission is determined depending on the receiving state of e). In other words, the reception condition is extremely good,
For example, if C/N=40dB or more, transmit immediately,
When C/N=39~30dB, after 2 seconds, C/N=29
According to the received C/N value, according to the procedure established within the system to transmit after a certain time elapses, such as 4 seconds when it is ~20 dB and 6 seconds when C, /N = 19 to 15.
The replies are sent to the mobile radio 1150 at different timings. The reason for taking this timing is to prevent interference caused by simultaneous transmission of control signals with other radio base stations 30, and to ensure that the mobile radio device 50 receiving the control signal is connected to a radio base station 30 with good reception status. This is to make it easier to select -n, etc.

Now, the signal transmitted from the wireless base M30-n to the mobile wireless device 50 includes the following content.

1] Call signal... Downlink obtained from the barrier exchange 120 (from the telephone in the telephone network 10 to the mobile heat ti1 machine 5o)
call signal.

This is a change from the current radio base 830-1 etc. to mobile radio equipment 5.
This is exactly the same as the call signal being sent to 0. Furthermore, the modulation level of the signal wave performed by the modulator included in the transmitter 31 of the wireless base station 30-n is also set to be the same as that of the wireless base station 30-1 and the like.

2] Control signal: This includes the following signals.

2-1) ID of mobile radio 150 received by own radio base station 30-n.

2-2) ID of own wireless base station 30-n.

2-3) A communication channel number that can be used by the own radio base station 30-n (without interference) and matches the service distinction and type of communication.

2-4) Reception status (reception C,/N values, etc.).

The control signal containing such information transmitted by the wireless base #30-n is received by the mobile wireless device 50.

In this way, the control unit 5 of the mobile radio device 50 receives information such as the C/N value sent from each radio base station 30-n, etc.
In 8, when these multiple pieces of information were compared, it was confirmed that the measurement result of the wireless base station 30-n had the best value, and that it satisfied the quality standard level 2 or higher, but 2>Ll. Then, the mobile radio device 50 connects to the radio base station 30
-n is judged to have approached the vicinity of the communication zone (zone n), and decides to switch channels.

Then, as a result of checking the ID and roam area information collation storage unit 54 to find out the available communication channel in zone n, it was found that the channel CHn is available for use as notified from the wireless base station 30-n. know. Therefore, using the uplink control channel, the wireless base station 30-n is
to perform transmission and reception on channel CHn, and also sends an instruction to the gateway exchange 2 via the wireless base station 30-n.
0, switches 5W1-1 and 5WI of switch group 23
In addition to -2,5W1- (n-1), 5W1- is turned on at the same time, and also for the radio base station 30n, the radio base station 30-1, 30-2°..., 3O-( n-1>
request that the user start transmitting the same call signal.

In response to these requests, the gateway switch 20 also turns on 5W1-n of the switch group 23, and switches on the wireless base station 30-n.
n starts transmitting a voice signal using communication channel n.

In this case, as a matter of course, the modulation depth of the modulator of the radio base station 30-n is also the same as that of the other radio base stations 30-1, 30-2.
30-3. ...3O-(n-1>).

In order to realize the transmission of this control signal, specifically, when the control signal is an analog signal, as shown in Fig. 2 (
As shown in a), the communication channel band is 0.3 to 3.0.
Low frequency fo outside KH2.

(e.g. about 100H2> or higher frequency f, 1°f
D2. fD3. ..., fD8 (for example, 3.8KH2
to 4.5KH2 at intervals of 0.1KH7 (when n=8) is used.

When there are many items to be controlled, that is, control data, the wave number of the control frequency fDO"D8 may be further increased, or a subcarrier format may be adopted. In this case, for example, By applying frequency modulation or field width modulation to one or more of the waves, more control data can be transmitted.

Furthermore, when a digital data signal is used as the control signal, it is also possible to digitally encode the audio signal and time-division multiplex the two to be transmitted. Do as shown below.

FIG. 3 shows a timing chart before and after channel switching in the present system shown in FIGS. 1A, 1B, and 1C.

In FIG. 3 illustrating the channel switching operation, the wireless base station 30-1 indicates that the quality of the channel CH1 used between the wireless base station 30-1 and the mobile wireless device 50 has decreased to level 1 or below. Alternatively, the communication quality monitoring unit 37 or 57 of the mobile radio device 50 detects this, and begins preparations to enable parallel reception of transmitted radio waves from the radio base station 30-n on the channel CHn through the process described above.

That is, the control unit 58 of the mobile radio 1m50 had previously controlled the synthesizers 55-1, 55-2, . ..., 55-(n
-1>, radio base station 3 by channel CHI
Radio base station 30 with 0-1 transmission wave, channel CH2
-2 transmission wave, . A frequency synthesizer 55 is configured to generate a frequency that can also receive transmission waves of channel CHn transmitted from the station 30-n.
−n.

In this way, the radio base 130-1 transmits
? When communication with the radio base station 30-1 is about to be stopped due to quality deterioration of the channel CH1, the radio base station 30
-n and channel CHn are started. That is, in the mobile radio device 50, the repetitive switching of the selector switch 64-1 receiving the switching drive input signal from the reception switching controller 65C is continued. At the same time, the synthesizer 56-1.56-2. ..., 56- (n-1
> to operate channels CH1 to CI-1n -1
Synthesizer 55-n can also be operated to transmit data to radio base station 30-n using channel CHn from the state in which it was transmitting to radio base stations 30-1 to 3O-(n-1) using channel CHn. Move to a state where it is possible. Synthesizers 56-1, 56-2..., 56- used for this transmission
The output of n is repeatedly switched by the changeover switch 64-2 using a switching drive input signal from the transmission switching controller 67G.

During this switching transmission/reception period in which channels CH1, CH2, . . . , CHn are transmitted and received in parallel, channel C
Confirmation of HD and the quality of the same channel are continued until the mobile radio device 50 confirms that the quality of the same channel is a certain level 2 or higher,
After that, channel CHI is released and wireless base station 30-2
．． 30-3. ..., 30n and the mobile radio 50 are communicated on channels CH2, CH3, ..., C)-1n
The process continues without interruption.

Changeover switch 641.64 during this switching transmission/reception period
The switching frequency f1 of −2 is determined to be, for example, 2n times or more the highest frequency included in the signal. This will be explained in detail below.

The optimum value of the switching frequency is determined by considering the following conditions.

1) Modulation format of the signal to be transmitted 2) Signal frequency band to be transmitted 3) Control frequency band to be transmitted 4) Band characteristics of the transmitter/receiver section, especially the band characteristics of the high frequency filter installed at the antenna input end 5) Waveform characteristics of the switching controller 6) Response characteristics of the frequency synthesizer 7) Carrier frequency and number of channels used in the system 8> Radio wave propagation characteristics of the transmission line 9) From the barrier switch 20 to the wireless base 830-1 Signal transmission path to mobile radio device 50 and radio system control device 20
For example, if 1) is frequency modulation and 2) is an audio signal, the transmission delay time difference is 0 due to the difference in the transmission path of the signal from
．． 3 to 3.0K)-1z, 0.3K when using the out-of-band control signal shown in Fig. 2(a) as 3).
H2 or less (fDo) or 3.8-4. .

5Kl-1z (fol, fo2-f, B).

As the characteristic of 4), the passband width is 16 to +-12 (or 8KHz), and as the characteristic of 5), the response characteristics of the synthesizer in 6) are good and the output waveform is good. In this case, it is desirable that the synthesizer used has as rapid a response characteristic as possible due to the input of the switching controller in step 5).

Items 7) to 9) are items to be considered from the system design perspective. In the car phone system described as an embodiment of the present invention, item 7) is 900 MHz and 600 channels, so the frequency bandwidth used is 15 MHz (or , 120
0 channel is 15MH2), 8) is known in many documents, and 9) is about 0.03 msec.

Taking the above into consideration, for example, in a car telephone system, the switching frequency of the changeover switch 64-2 of the mobile radio 50 is selected to be approximately 20XnMH2.

The case of reception will be explained below. If the audio signal or control signal is digitized as shown in FIG. 2(b), it is appropriate to use a faster frequency as the switching frequency, and a value of about nX20KH2 to 30KH2 may be used.

Also, the channel CHI seen from the input section of the reception mixer 63
, 2, 3. −． n-1, the carrier frequency of n is ω1. ω2
．． ..., ω, -1. ω. , also synthesizer 55-1
．． 55-2. ..., 55-(n-1) Let the output frequencies of 55-n be ω, 1. ω, 2ωLn-1. ω[,
Then, the radio base stations 301.30-2-, 30- (
n-1>, the frequency of the carrier wave at the output of the intermediate frequency amplifier included in the reception mixer 63 from 30-n is as follows: Ω1=rostral−11(11) Ω2・u2(ld[2(12) Ωn− 1=wn-1”Ln-I n-10
=ω −ωLn (1,)n In other words, by the operation of the changeover switch 64-1, the receiving section 53 receives Ω1=(1−wLl Ω2=″)2−″)[2 Ωn−1−(I ) n-1-'''Ln-1Ω = ω - ω
[.

Signal waves having carrier frequencies such as nn are sequentially input. And (11) and (12)...Equation (1) is Ω → Ω →... Ω = Ω (2>1
The relationship is 2n-1n. Such a signal is amplified in the receiving section and then demodulated in the demodulation circuit, but if there is a frequency difference with n intermediate frequencies 1[1 ω2-(1)L2 n-I Ln-1 ωn -QJLn , distortion noise may or may not occur in the demodulated output signal. In other words, in the case of frequency modulation or phase modulation, distortion noise will not occur if there is no frequency difference at all, but if there is a frequency difference and the frequency difference (beat frequency) contains the same component as the signal frequency, distortion noise will occur. However, if it is not included, it will not occur.

On the other hand, in the case of amplitude modulation, no distortion noise occurs even if there is a frequency difference. However, even in the case of amplitude modulation, if an intermediate frequency amplifier or the like has nonlinear characteristics, nonlinear distortion will occur due to harmonics, so it is necessary to use an amplifier with good linearity.

Reception mixer 63 of mobile radio device 50 as described above
When the local oscillation frequencies for CH1, CH2, . . . C)-In-1 and CHn are cyclically added and received to the input of It will be theoretically explained that it can be executed without any momentary interruption (noise mixed in) and that it has a receiving diversity effect.

First, a case where an angle modulated wave is used will be explained.

A data or audio signal (for signals in analog or digital format) can be expressed as:

Moreover, the control signal that exists outside the band is μ(t)=,Σa−cos (CHt+θKasumiC1・m+
11 Here, a・ is the magnitude of the amplitude, ωi is the angular frequency of the signal,
θ· represents the phase when 1=0. m.

n represents a positive integer.

Next, the case of frequency modulation will be explained, but the present invention is similarly applicable to phase modulation. When the carrier wave is frequency modulated using equation (3) or equations (3) and (4), the modulated wave 1q is: I= I□ sin f (ω0μ(t)>d↑=Io
Sin(ωt+5(t)>(5) or 1=Igsinf(ω10μ(1)0μC(t))dt=
IoSin(ωt+5(t) +5C(t)) However, mi = ai /ωi (i=1.2.3...n)
As a result, the expression s (t) in sin on the right side of equation (5')
+5o(t) will represent the transmission signal in negative numerical form.

Now, using equation (5) or (5'), radio base stations 30-1, 30-2. −． 30- (nl), 30-
The signal transmitted from the mobile radio device 50 is input to the reception mixer 63 via the antenna of the mobile radio device 50, and the local oscillation frequency (in the case of FIG. 1B, the synthesizer 55-1, 55-2, . . .
, 55-(rl-1>55-n>), the input (5') of the receiving section 53 is expressed as the following equation using the same symbols as equations (1) and (2). (However, the selector switch 64-1 is in the stopped state).

I H=I □H3ln (ΩHt+5(t) +S
, H(t)>(t=1.2. . . , n) Next, assume that the changeover switch 64-1 starts a switching operation. Also, wireless base station aO-; (i=1.2.・
..., n) is the audio signal s(t) and the control signal S. 1
Suppose that (1) is sent respectively, the movement y! ! ,
As an input to the receiving section 53 of the line machine 50, 1=(101/
n> [1+2 Fl(n/rr+yr))xsi
n (myr/n)cosmpt]xsin (Ω1
15(1)+5o1(t) )+(102/n)
[1+2, El(n/mπ))xsin (mπ
/n) xcos mp (t-2π/ (np))koxsin
(Ω2 t+5(t) +5o2(t) ) ten(1
03/n) [1+2';, 1(n/myr) )x
sin (rr+yr/n) xcos mp (t-4yr/ (np)) ]
xsin (Ω3t+5(t) +5o3(t) )+
(Ioo/n>[1+2Σ (rl/mπ)) m=1 xsin (mπ/n) xcos mp (t -2(n-1) yr/ (n
p) ) ]xsilo (Ω t+5(t) +
5Cn(t)) However, p is the switching angular frequency, m is a positive odd number, and the switching times for n input waves are set at equal intervals.

By transforming the side of equation (7), we get the following equation.

I = (I01/n) [sin (Ω1t +
U1 (j) )+(n/π) Sin(π/n> x[cos((Ω1 D)t+U1(j))−cos
((Ω1 +E)) j+U1 (t) ) ]+ (
n/3π) sin <3π/n) x [cos((Ω1
-3p)j+U1 (t))-cos((Ω1 +3p
)j+U1 (t))]+(n15π)sin (
5π/n) x [cos ((Ω1-5p)t+u1m)
-cos((Ω1 +5p) t+L11 (t) )
]] ten------°
Co+ (I02/n) [sin (Ω2 t+U2
(t) )+(n/π) sin(π/n) x[cos((Ω2 1)) i+U2 (j) )−
cos((Ω2 +p) t+U2 (t) ) ]+
(n/3yr) sin (37r/n) x [cos
((Ω2-3p) j+LJ2 (t) )-COS(
(Ω2 +3p) t+LI2 (j) ) ]]+n
15π) sin (5π/n> x[cos((Ω2 5p)j+U2 (j))−co
s((Ω2 +5p)t+U2 (t)) ]]1°−
゛- ] (10o/n) [sin (Ω.t+U, (t))
+(n/π) sin(π/n) x[cos((Ω −p)t+U,(t))−cos(
(Ω.+p> 10u.(1))]+ (n/3π)s
in (3π/n>x[cos((Ω −3p) t
+Lln(t))−cos((Ω+3p)t
+tJ, (t))ko+(n15π)sin (
57r/n) x [cos((Ω −5p> t+U.(
t))-cos((Ω +5p)t+U.(1) )
]] +... However, U・(t) =s(t) +s. 1(t)■ (1=1.2....,n) Here, looking at equation (8), it is a combination of many carrier waves, so it is amplified as is with an intermediate frequency amplifier and then demodulated. In general, there is a possibility that distortion noise will be generated due to cross-modulation (interference disturbance).

Furthermore, the amplitude I of the input wave is expressed by equation (8). 1゜IO2
,..., Ion does not necessarily have the same amplitude, but when the time occupancy rate of switching is made equal (duty 100/
n%), the wireless base station 30-2 is higher than the wireless base station 30-1.
Since it is closer, it is usually I. 2. In3.・
..., Ioo is larger. Iol.

If the magnitudes of IO2 etc. are different, cross modulation may occur. There are two types of cross-modulation causes: one is due to the combination of many carrier waves as shown in equation (8) above, and the other is due to differences in IO1, IO2, etc.

Now, regarding cross-modulation caused by combining many carrier waves as shown in equation (8), distortion noise can be removed by the following method.

That is, there is a method of increasing the switching speed (period) of the changeover switch 64-1 to drive it out of the bandpass characteristic of the intermediate frequency amplifier. However, as already mentioned, in many cases where the switching frequency is set to 2n times or more the highest frequency of the signal, there is no need to make it any faster. By increasing the speed, m = 1 on the right side of equation (7).
As can be seen from equation (8), the term 3゜5... can be ignored in the intermediate frequency amplification stage, and (8)
The formula can be expressed as below.

I= (1/n> x I 01 sin (Ω1t+5(t) +5o1
(t) )+ (1/n> X I 02 Sln (Ω2t+5(t) +s.2
(t)) +... +(1/n) xIo, 5in(Ωn-1t +s (t) + sc
, (t) > In equation (9), Ω = Ω =...Ω = Ω = Ω (10
)1 2 n-1n 5o2(t) =...=Scn-1" =so
n(t)=.

Suppose you can open it. In fact, equation (10) is technically possible by the means described later, and equation (11) can only be obtained from the wireless base station 30-1 (or from the wireless base station 30-n in the case of a channel switching connection) as described above. ) Equation (11) holds true if only the control signal to be transmitted is considered. Then, equation (9) can be transformed as follows.

1= (1/n) X I 01 S! n (Ωt+5(t) +5o1(
t) )+(1/n)X(IO2+103+...
・+Ioo)xsin(Ωt+5(t))
(12) Equation (12) is transformed into the following equation.

+2 l011oxcos 5o(t) ) ””xs
tn(Ωt + s (t) + β(t) > (1
3) x ((I01/I, ) +cos 5o(t
) ) -'](13') In = (IO2+103+--ten■On)/n(
13'') (13), (13') In equations I(>1<<In (14) so(
t) <<1 (14'), so equation (13) becomes approximately as follows.

I= (1/n) XIoSln(Ωt+5(t)+5o(t)>(15)
Looking at the formula, this is a switching reception diversity system with n-branch antenna inputs, and as a result of so-called linear synthesis, in which signals are switched and received and then combined directly, the input electric field is low. 1 is ignored and synthesis is performed using an input signal with a high input electric field. If the duty of the reception changeover switch is made variable and the duty is increased for a channel with a large reception input, this effect will become more pronounced. Therefore, it has been revealed that the present invention has a reception diversity effect.

From equation (14), the output of the frequency discrimination circuit (radio receiving circuit 6
8) is expressed by the following equation.

E=d/dt (s(t) +5C(t))=μ(()
+μC(0 where μ(1) and μ.(1) are each (3)
and (4).

Note that equation (14) is always satisfied in normal mobile communication systems and is not a particularly limiting condition.

It applies deep modulation to the main audio signal compared to the control signal, and shallow modulation to the control signal.Moreover, the depth of modulation applied to the audio has recently changed to an equivalent tone (1KH2>
If the signal is 3.5 radians (25KHztll transmission interval, and the carrier interval is 12°5KH2, the same <
This is because it is shallower (1.75 radians).

From the above, it has been clarified that equations (10) and (14) are sufficient conditions for no distortion in the case of frequency modulation. The technical conditions for establishing equation (10) will be described below.

Technically, to do this, the radio base station 30-1.30
-2. . , 30-n transmitting units 31-1, 31-2.・
... is achieved by increasing the frequency stability of the reference crystal oscillator, which determines the stability of the carrier frequency of 3l-rl. For example, in the example of the car telephone system described later, the stability of the reference crystal oscillator installed in the base station is currently 0.
．． 5~H) pm (0.5~lXl0-6), so the frequency fluctuation of the carrier wave is lX10'X 900HH2
= 900H2.

In this case, noise is just mixed into the audio signal band.

However, if 0.01ppm has become possible due to technological progress, then IX 10'X 900MH2=
9H2, and even if there is a harmonic of the noise, there is less possibility that its large energy will mix into the signal band. Alternatively, in a wireless system using a carrier wave frequency of 9 Ml-IZ, a carrier wave fluctuation of 1 Dpm will not introduce noise even with the current technology.

The above is Mobile Radio F! Although the case where the i50 receives has been described, the case where the mobile radio 150 transmits will now be described.

In FIG. 1B, the wireless signals switched by the changeover switch 64-2 are, for example, wireless channels CH1, CH2,
..., CHn are sequentially switched, but the receiving side is the radio base station 30-1 (CHl>).

30-2 (CH2>, ..., or wireless base station 30
-n (CHn) and mixed as in the case of reception on the mobile radio 50 side, there is no cross-modulation problem at all. However, as is clear from equation 8), there are components of the carrier angular frequency (Ω±np>) as sidebands, so these are emitted into space and interfere with the communication of other channels or other systems. It is necessary to provide a bandpass filter at the transmission output section for filtering so as not to cause

For this purpose, it is necessary to spread the equation (Ω±np) outside the frequencies of all channels transmitted by the mobile radio A50 as a switching frequency. , p/(2π)>15XnMHz.

This will be explained below using formulas. However, the characters used in the formula are the same as above unless otherwise specified. for example,
The transmission signal appearing at the output of the transmission mixer 61 in FIG. 1H is expressed by the following equation.

1=Io[1+2ax (n/mπ)) xsin (mπ/n) cos mp t ]x
sin (Ω1t+5(t)+5o(t))+I.

[1+2Σ(n/mπ) m=1 xsin (mπ/n) xcos mp (t-2yr/ (np) )koxs
+n (Ω2t+5(t)+5o(t))×I□ [1
+2Σ (n/ml) m=1 xsin (myr/n) xcos mp (t-4π/ (np)) ]xs
in (Ω3 j+5(j)+5o(1))+1□ [
1+2Σ (n/myr> )m=1 xsin (mπ/n) xcos mp (t-2(n-1) 7C/ (r
l) )xs+n (Ω, t+5(t)+Sc(t)
)m=1,2,5. ...... However, p is the switching angular frequency, m is a positive odd number, and the switching times for n input waves are set at equal intervals.

When formula (17) is transformed, the formula has the same form as formula (8).
Ru. Then, by applying the obtained expression and passing it through a bandwi filter having the function as described above, the following expression 1q is obtained as an output signal.

1=Iosin(Ω1t+5(t)+5o(t))×I
oS! n(Ω2 t+5(t) +5o(t) )+
I □ Sln (Ω, t+5(t) +5o(t)
) In the above equation, the first term on the right side is for the wireless base station 30-1, the second term is for the wireless base station 30-2, and the first term is for the wireless base station 30-1, and each signal is transmitted using normal frequency modulation. The formula is the same as in the case of .

The uplink signal of channel CHI is transmitted from the wireless base station 30-1.
．． The upstream signal of channel CH2 is received at 30-2, and the upstream signal of channel CHn is received at 30-n. These received signals are demodulated and transmitted to necessary devices such as the barrier switch 20.

Alternatively, the wireless base station 30-1 is
In the case of having the configuration shown in the figure, the uplink signal of channel CH1 is sent to the transceiver 90-1 of the radio base station 30-1. Channel C
The upstream signal of H2 is sent to the transmitter/receiver 90-2 of the same 30-1. The upstream signals of the channel CL-In may be received and demodulated by the transmitter/receiver 90-n of the channel CL-In in the following order, and then mixed and transmitted to necessary devices such as the barrier exchange 20.

As is clear from the above description, by using the multiplex transmission method and apparatus of the present invention, it is possible to obtain a signal diversity effect in the receiving section.

In the barrier switch 20, the wireless base stations 30-1, 30-2.
. . , among the n signals from the radio base stations 30-1, 30-n, the voice signal is 30-1.30=2. ..., 3
Mix signals from 0-n. When mixing, the signals from the radio base stations 30-2, 30-3°..., 30-n have better transmission quality than the signals from 30-1, so they can be mixed as is, or the S/N may be mixed with an output proportional to .

In other words, a reception diversity effect is obtained.

The transmitting/receiving diversity effect of the present invention has been described above, and a method for increasing the effect will be described in detail below.

First, regarding reception diversity, in the sequential switching method described above, each synthesizer 55- of the changeover switch 64-1
1.55-2. ..., 55-n have the same connection duration (duty time). However, this is not always necessary; on the contrary, the diversity effect will be increased by connecting for a relatively long time to the φ radio channel where a reception input with a good S/N ratio can be obtained. For this purpose, a part of the receiving section is synchronized with the changeover switch 64-1, detects the signal-to-noise ratio at that time, transmits this to the control section 5B, and thereby changes the frequency of the output of the reception switching controller 65C. This makes it possible to achieve the above objectives. This is also possible with the configuration shown in Figure 1B, but
In order to facilitate technical explanation, the following explanation will be made using the configuration shown in FIG. 1G.

The difference in this figure from FIG. 1B is that the radio receiving circuit 68
Apart from this, there is a C/N measurement receiving section 52, a receiving microphone, and a receiving section 73.
, and a changeover switch 64-3 are installed, and the changeover switch 64-3 is controlled by the control unit 58B. The operation shown in FIG. 1G will be explained below.

In the figure, a reception mixer 73 is installed at the front stage to operate the C/N measuring reception section 52. A part of the reception signal received by mobile radio 50B is added to reception mixer 73. The output from the changeover switch 64-3 is added as the local oscillation frequency to the reception mixer 73. However, this changeover switch 64-3 does not need to be switched at a high speed like the other changeover switches 64-1 and 64-2, and a low speed of about 1OH2, for example, is sufficient.

When the selector switch 64-3 is in the position to turn on the output of the synthesizer 55-1, the C/N measurement receiving section 5
The control unit 58B controls the C/N value of channel CH1 measured in step 2.
to communicate. Next, when the selector switch 64-3 is in a position to turn on the output of the synthesizer 55-2, the C/N of the channel CH2 is measured. Synthesizer 55 in the following order
- When in position to turn on output of n, channel CH
The C/N of D is measured and transmitted to the control unit 58B. The control unit 58B uses these values to control the switching frequencies of the reception switching controller 65C and the transmission switching controller 67C so that they each operate at a speed inversely proportional to the C/N, for example.

In order to enable the above operation, it is necessary to make some changes to the method of transmitting signals from each of the radio base stations 30, which will be explained below.

Now, if we reproduce the above equation (9), I −, 'iX, I □Hsin (Ωit±s(B
+s ・(t)>(9)<r=1.2.・
..., n) In equation (9), the control signal transmitted from each radio base station 30 includes the ID of the radio base station 30, and this ID must be used to change the duty of the above-mentioned changeover switch. Since it is necessary, as in the above-mentioned equation (11), 5ci=O <r=1.2. ... n) I can't leave it alone. Therefore, in this case (10
) holds true, but the equation corresponding to equation (12) is as follows.

In equation (19), each 5ci(t) is sufficiently smaller than 1 (however, the constant term is omitted), (12)
Approximately, the following equation is used as an equation corresponding to the equation.

The signal expressed by equation (20) is demodulated, and each wireless base station 3
In order to extract the control signal transmitted from 0, 5o1
By making the frequency components of the signals included in (t) different, it is possible to filter them using a filter.

Therefore, by measuring the C/N of each radio channel, adding the ID of the radio base station 30 that sent the signal, and sending it to the control unit 58B, the control unit 58B measures the C/N for each radio channel, that is, for each radio base station. The duty time for receiving (or transmitting) every 30 C/N
It becomes possible to define it in relation to fllI.

In order to achieve the above effects with the configuration shown in FIG. 1B, each radio base station 30-1, 30-2. ...
Control signal 5o1(t) transmitted from 30-n,
562(t), . Then, this measured value is reported to the control unit 58, and the switching duty is determined according to the signal-to-noise ratio.
All you have to do is operate 4-1.

By operating the receiving section 53 of the mobile radio device 50 as detailed above, it is possible to increase the transmitting and receiving diversity effect.

Next, a method for further increasing the reception diversity effect will be explained. Figure 1H shows the mobile radio device 5 in this case.
An example of the configuration of 0G is shown.

In Fig. 1H, the input radio wave (input signal) to the mobile radio device 50C is divided into n+1 equal parts at the antenna input section, and each is divided into radio reception circuits 68-1.68-2°..., 68-n and interference detection. It arrives at the container 62. Each radio receiving circuit 6
8-1 to 68-n, each receive mixer 63-1.
63-2. ..., 63-n, receiving section 53-1.53-
2. ... 53-n, and each of the reception mixers 53-1 to 53-n is equipped with a synthesizer 55-n.
1.55-2. ..., the local oscillation frequency from 55-n is input. Therefore, in the configuration shown in FIG.
C)12. ...C) It is possible to receive and demodulate the -1rl signal.

Moreover, the output signals of these receiving sections 53-1 to 53-n are as follows.
A part is sent to the control unit 58C, and a part is sent to the communication quality monitoring unit 58C.
7-1.57-2. . . , 57-n, the communication quality of each wireless channel is monitored, and the results are sent to the control unit 5.
8C, and the outputs of the receiving sections 53-1 to 53-n are sent to the signal mixing circuit 62, where they are subjected to processing similar to that of a normal diversity receiver (in this case, synthesis after detection). and sent to the telephone section 59.

By adopting a circuit configuration as shown in FIG. 1H, it is possible to obtain a large diversity effect.

As is clear from the above description, the operation of the present invention is to predict the frequency shift after switching to a new communication channel by measuring the transmission frequency of the mobile radio device 50 at the radio base station 30, and to predict the frequency shift after switching to a new communication channel. By setting and using the transmission channel of the wireless base station that communicates after channel switching at an appropriate frequency, the system eliminates noise caused by call interruptions and cross-modulation that occur due to channel switching.

Next, the method of using the control signal, which plays an important role in channel switching during a call according to the present invention, will be explained.

In the following description, it is assumed that the configuration shown in FIG. 1B is used.

Wireless base station 30-1.30-2. , 30-n to the mobile radio 50 using channels CHI, CH2, . . . , CHn will be described.

When the aforementioned channel switching preparation operation is completed, the radio receiving circuit 68 of the mobile radio device 50 receives the radio base station 30-1.3.
0-2.・, channels CH1, CH2 from 30-n
, . . . , CHn are transmitted as speech signals, which are sequentially switched by the changeover switch 64-1 in the mobile radio device 50, and are selectively received.

Furthermore, since the changeover switch 64-2 also starts operating, the transmission wave from the mobile radio device 50 also starts to be switched and transmitted.

Here, from the barrier switch 20 to each wireless base station 30-1 to 30-3,
0-n via mobile radio 501. :The delay time difference due to the difference between each route (within joFJIt) is at most 0.03 msec or less, so there is no problem with operation.
Can be ignored. In addition, wireless base station 30-2.3
0-3. −． 30- For the down signal from (n-1),
Although it is only an audio signal, the wireless base stations 30-1 and 30
In addition to the audio signal, the downlink signal from -n includes a control signal (
Since the identification signal for identifying the wireless base stations 30-1 and 30-n and the switching command signal are inserted in the form of out-of-band signals as shown in FIG. The wireless l-multiplier circuit 68 receives this and transfers it to the control section 58.

The control unit 58 identifies this signal, and under the control of the control unit 58, initially the channel switching response signal from the radio base station 3Q-1 and the subsequent channel C)-In from the radio base station 3Q-n are transmitted. To confirm that the quality of this signal is also good, we use the radio transmission circuit 68 to use the outside of the uplink communication signal band, and send this confirmation to the wireless base 83 Q-n. Call channel CHr
1 to contact the gateway exchange 20 via the wireless base station 30-n.

Since the barrier switch 20 received notification that the downlink communication between the wireless base 430-n and the mobile wireless device 50 is working well, the communication path control unit 21 switches the switch 5WI- of the switch group 23. 1, 1-2, ... 1-n, SW'
Only l-1 is turned off. - On the other hand, the mobile radio device 50 stops transmission to the radio base station 30-1, stops the operation of the synthesizer 55-1 of the mobile radio device 50, and stops the operation of the switch 64-1 (see FIG. 1B). ) to synthesizer 55
-2゜55-3. ... Ripple 55-n so that it performs a circular switching operation.

These conditions are illustrated in FIG.

Next, channels CH1, CH2, .
. . , wireless base stations 30-1, 30-2, using CHn.
. . , 30-n will be explained.

In the mobile radio device 50, the reception switching controller 65C and the transmission switching controller 67C are activated according to instructions from the control unit 58 in the mobile radio device 50, and the changeover switches 64-1 and 64-2 are respectively activated. Synthesizer 55-
1.55-2. . . 55-n output and 56-1.
56-2. ....

56-n output to channels CH1, C and 12.
．． ..., CHn is being sequentially switched and transmitted/received (1B
figure>. During this operation, the signals sent to the communication channel include, in addition to the communication signal, an out-of-band control signal (see Figure 2 (a)).
As, the state of the channels used by the mobile radio 1a50 (from channels CH1, CH2°-CHn to channels CH2, C
H3, . ing.

The uplink signal of channel C++ received by the radio base station 30-i (+=1.2.-n) is demodulated by the receiving unit 53 of the radio base station ao-r, and the demodulated audio signal and out-of-band signal are After confirming that there are no abnormalities in the
will be forwarded to. In the barrier switch 20, the wireless base station 30-
1.30-2°... Among the n signals from 30-n, the audio signal is transmitted to the wireless base station 30-1.30-
2...

Mix the signals from 30-n. At the barrier exchange 20,
Wireless base #30-1.30-2. . . , 30-n, among the n signals from the radio base stations 301.30-2.・
. . , 30-n, each wireless base station 30-1 receives an identification signal sent outside the audio band.
．． 30-2. ..., channel CH1 from 30-n
, CH2, -, Ct-1n.

The barrier switch 20 confirms that the channel switching operation is proceeding smoothly during the call, and then switches the control unit 38 of the mobile radio 5O to
channel CHn via radio base station 30-n.
Therefore, communication with the radio base station 30-1 via channel CHI is stopped, and the radio base stations 30-2, 30-3. −． 3
Report that it is possible to concentrate on communication with 0-n.

In the mobile radio device 50 that has received this control signal, the control unit 5
8, synthesizers 55-1 and 56-1
The operation of the synthesizer 55-2, 55-3, .
. . , 55-ml are cyclically switched, and the transmission channel selection switch 64-2 includes synthesizers 56-2, 56-3, . ..., 56-n to continue the cyclic switching operation.

As a result, the mobile radio 150 changes the previous channel CH
The communication with the radio base station 30-1 using the radio base station 30-2, 30-3. . . 30-n using channels CH2, CH3°, . . . CHn, respectively. Channel switching is now complete.
A state in which communication is being performed using the new wireless channel group is realized. The uplink channel and downlink channel switching operations described above are performed in parallel and end at approximately the same time.

As is clear from the above description, there is no momentary interruption during channel switching, and noise can be kept to a low level that poses no problem in practical use.

If a malfunction or non-operation occurs during any of the above operations, the operation must be restarted from the previous operation. In addition, when the operational failure is large, the control unit 58
There is also an operation for returning to the communication channel before the switching operation, which is stored in the memory section built into the device.

78 through 7E are flow charts showing the flow of operation of the system shown in FIGS. 1A, 1B, and 1C.

Gateway exchange 20. Wireless base station 30-1, 30-2,...
, 30-n and the mobile radio 50 start operating, and the switch 5W of the switch group 23 included in the barrier exchange 20
1-1.1-2. - 1-(n-1) is on, and the radio base stations 30-1, 30-2.・, 30- (
n-1> and the mobile radio device 50 are communicating. For this communication, channels CH1, CH2, -CH-(n-
1> downlink frequency F1. F2. ..., Fn-1 and upstream frequencies f1, f2, "" fn-1 are used (SIOl, Fig. 7A).

Wireless base station 30-1, 30-2. ....

30-(n-1> constantly issues a reception status report from the mobile radio device 50, and if deterioration in communication quality is discovered, it is immediately reported to the mobile radio device 50 (3102)
. The communication quality monitoring unit 57 of the mobile radio device 50 receives this (8103) and monitors whether the call quality has deteriorated below level L1 (S104). If the call quality has deteriorated below level L1 (S104YES)
), the control unit 58 selects wireless base stations 30-2, 30-3, . , 30-n, etc., whereas the wireless base stations 30-1.30-2.30-3. −．
30- (n-1> and the mobile radio 850.
Figure B).

Each of the surrounding wireless base stations 30 (for example, 3O-n) that has received the monitor reception instruction monitors and receives the signal of frequency f1 (5106), and reports the result to the communication quality monitoring unit 57 of the mobile radio device 50 (3107). .5108), the monitor reception quality from each radio base station 30 is measured and compared, and the call quality of radio base station 3Q-n is determined to be a certain standard level L2, for example.
(S109YES).

If the communication quality is not good (3109 NO), the process returns to step 3105 and other wireless base stations 30 are made to perform monitor reception.

Therefore, the control unit 58 controls whether the mobile radio device 50 is connected to the radio base station 30 or
3110, and the seventh
In order to switch to communication with the wireless base station 30-n, the wireless base station 30-n searches for an empty channel that can be used (8111), and as a result, the channel CHn
is determined (3112). The control unit 58 controls the mobile radio device 5
The wireless base station 30-n is instructed to prepare for communication on the channel CI-1n through the transmitter 51-n and the receiver 53-n of the wireless base station 30-n (S113).

A communication preparation command for using channel CHn is sent to radio base station 30-n, and preparations for communication using channel CHn are made (8114.). The mobile radio device 50 prepares to enable communication using the channel CHn, that is, the control section 58 makes preparations to enable communication using the channel CHn.
For n, receive frequency F and frequency f. The switching controller 65 then enters the switching operation (5115, FIG. 7D).

When ready to communicate using channel CHn, the wireless base station 30-n notifies the mobile wireless device 50 of completion of preparation using channel CHn (5116>), and at the same time, the wireless base station 30-n n issues a report to the barrier exchange 1N2O that preparation for communication between the radio base station 30-n and the mobile radio 50 via channel CHrl has been completed (8116).

When the barrier exchange 120 confirms the completion of communication preparation between the radio base station 30-n and the mobile radio device 50 using the channel CHn (S117), the switch 5 of the switch group 23
W1-1.1-2. ..., 1-(n-1> remains on, and switch 5W1-n is also turned on (3118
). Therefore, the communication path control unit 21 included in the barrier switch 20
reports to the mobile radio device 50 that it is possible to start communication with the mobile radio device 50 using channel CHn (S119).

Upon receiving the communication start possibility report, the radio base station 3Q-n sends a communication start signal to the mobile radio device 50 using channel CHn.
It is sent to the addressee (S123). The mobile radio device 50 confirms the start of communication using the channel CHn using an ID signal which is an identification signal for identifying the radio base station 30-n.
24> At the same time, the communication quality monitoring unit 57 of the mobile radio device 50 measures the quality level of communication between the mobile radio device 50 and the radio base station 30-n, and detects that the quality level is equal to or higher than a certain quality level 2. Then (Sl 25YES, FIG. 7E), channel C between the radio base station 30-1 and the mobile radio 50
The wireless base station 30- stops communication that was being performed using H1.
1 (S126) As a result, the wireless base station 3
0-1 turns off communication via channel CHI (31
27>.

When the mobile radio 50 confirms that the communication via channel CHI has stopped (S129), the operation of the synthesizers 55-1 and 56-1 is stopped, and the changeover switch 64-1 stops switching to the output terminal of the synthesizer 55-1. However, the selector switch 64-2 stops switching to the output terminal of the synthesizer 56-1 (although this operation is not necessarily required).
Then, channels CH2, CH3, . . . , C1-(n are operated.

The communication path control unit 21 of the gateway exchange 20 confirms that the channel CH1 communication has stopped, and switches the switch 5W1- of the switch group 23.
2.1-3. −． Leave 1-n on and switch 5
Turn off WI-1 (8128).

This ends the period of channel switching operation and switches 5W1-2.1-3. -1-n on state, channels CH2, CH3,..., OHn downlink frequency F2
．． F3. ..., Fo upstream frequency f2-f3. ...
, fo, the mobile radio 50 connects to the radio base station 30 . −
2.30-3.・, 30-n, it is possible to continue high-quality communication without instantaneous disconnection or noise mixing, and by obtaining a transmission/reception diversity effect (313-n).
0).

(6) Estimation of moving speed of mobile radio equipment and communication channel allocation method for traffic congestion measures Changes in received electric field or communication quality received by multiple radio base stations 30 communicating with mobile radio m50 are measured and compared. Mobile wireless IN by
It is possible to detect the speed (travel direction and speed) of 5'O. These will be explained below using FIG. 8.

In FIG. 8, 16 circles each indicate small zones 71 to Z16 within the service area, and radio base stations 301.30-2. ..., 30-
16 etc. indicate areas where communication is possible.

The mobile radio device 50 currently communicating is in zone Z6 and is connected to radio base station 30-2.30-3.30-5.30-6.
．． Assume that communication is being performed with seven stations 30-7, 30-10, 30-11 using diversity. mobile radio 4
150 is moving in the direction of the arrow in FIG.
Each of the two radio base stations is measuring the received electric field or reception quality, and these values are collected into the mobile radio device 50. By comparing these measurement results, mobile radio 150 estimates the moving direction and speed of mobile radio 50 using the following method.

First, it can be estimated that the direction of movement is toward the wireless base station (30-7 in Figure 8) where the observed input received electric field level changes most rapidly.This is a highly reliable result. It is important to choose the measurement duration appropriately in order to increase the
It is largely related to the speed of That is, since the radio wave propagation characteristics change from moment to moment, it is possible to eliminate variations in the measured values by measuring at intervals of a certain length of time (3 to 10 seconds in the case of a car). 8th
In the figure, when the measurement results 1q are expressed in order from the radio base station 30 with the largest increase in the input electric field, for example, 30-7>30-11>30-3, and the radio base stations 30 with the largest decrease in the input electric field If expressed in order starting from the radio base station 30, it would be as follows: 30-6>30-10>30-2>36-5.

Furthermore, the moving speed can be estimated by comparing it with the radio wave propagation curve, which is calculated by 1q from the radio wave propagation characteristics.

By using the above measurement results, the destination of the mobile radio device 50 is estimated, and the communication traffic situation of the destination wireless base station 30 is investigated. It becomes possible to reduce the number of radio base stations 30 with which to communicate depending on the type of communication of the mobile radio device 50. Next, when the traffic congestion does not extend over one zone but over multiple zones, wide-area congestion comparison measures are required. This is a phenomenon that occurs in car phone systems, etc. in the city center of Obekai, and is shown at 30-30 in Figure 8.
6.30-7. It is assumed that 30-11 and 30-11 are in a traffic congestion state. Application of the present invention in this regard will be explained in detail.

Assume that there is a mobile radio t150a in zone Z11, moving in the direction of the arrow, and transmitting a calling signal.

This calling signal is collected by the mobile radio 50a, and the communication channel to be assigned is determined. However, when traffic is not congested, the radio base station 30-6.
10.30-11゜30-12.30-14.30-1
5 etc. is allocated (diaperity transmission and reception is performed). However, if traffic is congested in the above three zones (Z6, 7.11>), channels 30-6, 30-7 and 30-11 will not be allocated. The wireless base station 30 with the best quality is naturally 30-11, but
Not assigned due to the above reasons. If the multiplicity of diversity is the above fourfold (30-10, 30-12, 30
-14°30-15> is insufficient, the mobile radio 50a can estimate the moving direction and moving speed of the mobile radio 50a.
- Allocate a channel to be used in the 8th layer 30-16. Therefore, although the mobile radio device 50a is located in zone Z11, it is located at slightly distant radio base stations 30-8 and 30-16.
communication will begin.

By applying the channel allocation described above, it becomes possible to take measures against congestion in areas with high traffic density, which have not been solved using conventional system technology.

(7) Location registration method and operation of making/receiving calls while moving at high speed of a mobile radio device Explaining operations such as location registration, making/receiving calls, etc. when the mobile radio device related to the present invention is mounted on a car and moving at high speed. do.

As mentioned above, a specific system example to which the present invention is applied is as follows.
It is based on the use of a small zone or microcell structure. The size of the small zone or microcell was approximately 3 to 5 floors in radius for the car phone system, and 25 to 100 meters in radius for the mobile phone system. When mobile radio equipment 50 (B, C, D) moves within these zones, a necessary condition for ensuring communication is ensuring the required signal-to-noise ratio necessary for transmission and reception.

To explain this in more detail, the mobile radio device 50 (
B, C, D>'s moving distance is relatively small within the communication time, and on the other hand, the receiving electric field strength is
, C, D) that does not vary greatly throughout the distance traveled is a desirable condition for ensuring communication.

Using another expression, one wireless base station 30 (B, C
, D, E) is mobile radio R50 (B
,C.

It is sufficient that the travel distance is relatively large compared to the distance traveled during the communication time in D).

However, if the communication time of mobile radio devices (B, C, D>) is long, or if one radio base station 30 (B, C, D, E
) is relatively small, then
Although it was necessary to switch channels during a call as already explained, other measures such as those described below were not necessary. In the case of a car phone, one wireless base station 30 (B, C
,D.

Although the size of the service area of E〉 and the distance traveled by a car during a call during normal business hours satisfy the desirable conditions for securing communication, it is difficult to carry out mobile transportation using microcells as described below. If you try to bring the wireless 1150 (B, C, D) into a car and use it for communication, you will encounter a difficult problem.

In other words, in the mobile phone system as described in the following document, Ito ``Study of mobile phone system - Focusing on radio line control and routing,'' IEICE communication system, Mobile radios (mobile radios) are usually designed to be carried by people and used for making calls while walking. Therefore, even if the service area of one mobile phone master device (wireless base station of the present invention) is about 25 m in radius, the walking speed of a person is at most about 100 m/min, and one wireless base 830 (8, C, D, E) service area size and mobile radio equipment 50 (B, C, D)
Since the distance traveled during the call time is balanced, there is no particular technical difficulty in carrying out the communication.

However, when a mobile phone is installed in a moving object such as a car, which has a large distance traveled within a unit time compared to the size of a microcell, the required signal-to-noise ratio required for transmission and reception is lower due to the faster moving speed of the moving object. There may be cases where 1q is not possible.
Various problems as described below occur, and technical countermeasures different from those already explained are required.

First, location registration will be explained with reference to the above-mentioned Fig.
The registered signal is from the nearest wireless base station 30 (B, C, D).

E) cannot be received.

ii) R odd V) (1) No flNA ground 830 (B,
The registration completion signal of C, D, E) is sent to the mobile radio device 50 (
B, C, D) cannot be received.

Among the above mobile radios 150 (B, C, D), judging from the speeds of the mobile radios 150 (B, C, D).

Condition 1) occurs when the speed of C, D> is large,
Then, ii) will occur in the order. This is because each step in FIG. 4 was executed and reception became impossible at the final stage.

A case in which such an inconvenient phenomenon occurs due to high-speed movement is called a high-speed movement mode, and a mode in which the movement speed does not cause an obstacle is called a low-speed movement mode.

Next, call origination from the mobile radio device 50 (B, C, D) will be explained using FIG. 5A and FIG. 5B mentioned above.

j) The off-hook signal from the mobile radio 50 (B, C, D) is sent to the nearest radio base station 30 (B, C).

D, E) cannot be received.

ii) Nearest wireless base station 30 (B, C, D, E
) is the mobile radio device 50 (B, C).

D) cannot be received.

iii) The communication channel designation signal from the mobile radio device 50 (B, C, D) is transmitted to the nearest radio base station 30 (B, C, D).
C, D, E) cannot be received.

iv) Nearest wireless base #30 (B, C, D, E
)'s channel switching completion signal is sent to the mobile radio 6150 (B.

C, D) cannot be received.

■) The dial/on signal of the nearest wireless base station 30 (B, C, D, E) is the mobile wireless device 50 (B.

C, D> cannot be received.

vi) The dial signal from the mobile radio 1150 (B, C, D) is sent to the nearest radio base station 30 (B, C, D).

E) cannot be received.

Among the above mobile radio devices 50 (Judging from the magnitude of the moving speed of B, C, D>, the one with the highest speed is 1)
conditions occur, then ii), iii), i
v), v), and vi) gradually begin to occur at a slower rate. Note that situations v) and vi) can be remedied by channel switching technology during a call, but
I've listed this as an issue here.

To roughly explain the incoming call to the mobile radio device 50 (B, C, D> using the above-mentioned Fig. 68 to Fig. 6C), from the radio base station 30 (B, C, D, E) The mobile drone 50 (B, C, D) cannot receive the incoming call signal.

ii) The communication channel designation signal from the mobile radio device 50 (B, C, D) is sent to the radio base station 30 (B, C, D).

E) cannot be received.

111) The mobile radio device 50 (
B, C, D) cannot be received.

iv) Mobile radio 150 (B, C, D> to (7)
The channel switching report is sent to the wireless base station 30 (B, C, D, E
) cannot receive data.

vi) Off-hook signals from mobile radios 50 (B, C, D) cannot be received by radio base stations 30 (B, C, D, E).

Among the above, judging from the magnitude of the moving speed of the mobile radio device 50 (B, C, D>), i
) occurs, then ii), iii >, iv
) , v > , vi) will occur at a gradually smaller speed in the order. Incidentally, states v) and vi) can be remedied by channel switching technology during a call, but they are included here for the time being.

Also, channel switching during a call will be explained using the aforementioned Figures 78 to 7E: 1) Wireless base station 3
Mobile radio device 50 reports the discovery of communication quality deterioration from 0-1.
(Unable to receive when B, C, D>.

1) Although the report of the discovery of communication quality deterioration in i) was successfully received, the frequency f1
Unable to receive monitor results report despite issuing instructions to receive monitor results.

iii) Despite receiving the monitoring result in ii) and instructing the radio base station 30-n to use channel CHn, no response signal is received from the radio base station 30-n.

iv) It is not possible to confirm that communication with the wireless base station 30-1 is off.

Of the above, mobile radio device 50 (judging from the magnitude of the moving speed of B, C, D>, i) at the highest speed
The following states occur, and the states ii), iii>, and iv) gradually occur at a slow rate.

However, among the above, 1) is a mobile radio 1150 (B.

C, D> In a system in which communication quality is also monitored by itself, there is no problem even if reception becomes impossible.

Therefore, it is assumed that the system described below performs this monitoring.

Now, when the mobile radio device 50 (B, C, D> is in the high-speed movement mode, the operation of the present invention for ensuring communication will be described below. Depending on the movement speed of B, C, and D, wide area call mode and high speed movement mode.

It can be subdivided into three modes: a mode corresponding to the low-speed movement mode.

First, the wide area call mode will be explained. This is a mode in which sufficiently reliable communication cannot be ensured even if the method of the present invention is applied because the mobile phone is moving too fast. If the system is properly configured, this mode will not actually occur, as will be explained later.

A mode similar to a low-speed movement mode is a normal movement mode (low-speed movement mode) in which the movement speed is relatively low even though it is moving at high speed, or the system configuration is constructed to withstand high-speed movement. This is a case where system operation is technically almost the same. Therefore, there are no particular technical problems with this mode, and communication is possible with the system operation shown in the embodiments of the present invention already described.

Now, let's build a system using 50 mobile radio devices in high-speed movement mode.
(It is important to take measures to ensure that communication is possible with Method Study - Focusing on radio line control and routing, we will explain a system construction method suitable for high-speed mode, using the same method as in IEICE Communication Method Study Group C887-16 May 1987).

First, the mobile radios 50 (B, C, D) enter the high-speed movement mode while on the passage. Generally, radio wave propagation characteristics on roads are better than indoors.

In addition, a wireless base station 30 installed on a pole along a passageway, etc.
(B, C, D, E) should be aimed mainly at the mobile radio device 50 (B, C, D>) on the road. All you have to do is point at it.

That is, in order to constitute a small zone, the area does not need to be circular, which is the usual area, but may be oval or fan-shaped. Then, the same wireless base station 30 (B.

Even with the transmission power of C, D, E), the service area allows communication over a relatively long distance. Transmission power is 10m-
In the case of a circular zone, the maximum radius was 200 m outdoors, but in an ellipse, the radius was 300 to 400 m along the long axis.
It is possible to set up a service area up to

This is illustrated in Figure 14A. In FIG. 14A, it is assumed that there is a mobile radio 50 (B, C, D) in high-speed movement mode at point A or point B on the road, and the mobile radio FM 50 (B, C, D>) at point A or point B is Both cases are assumed to be moving at high speed to the right.Also, point P in Figure 14A
O-P3. L1゜L2. QO to Q2 are wireless base stations 30 (B, C, D, E) installed on pillars facing the road.
Indicates the location of Furthermore, the small zones surrounded by broken lines are PO, Pl, P2. P3. Services of wireless base stations 30 (B, C, D, E) installed at Ll and L2 positions
Show area.

Next, the operation related to the high-speed movement mode of the barrier exchange t120 shown in FIG. 1A will be described. As already explained about the functions of this barrier switch 20, the ID identification storage section 24 of the barrier switch 20 stores many wireless base stations 30.
(B, C, D, E) Ya mobile radio t150 (B, C,
A storage function for each mode related to D) is provided.

That is, the wireless base stations 30 (B, C) along the passage.

D, E) are stored in the ID identification storage unit 24 of the barrier switch 20 for low-speed mode like the wireless base stations 30 (B, C, D, E) installed in other locations. , mobile radio device 50 in high-speed movement mode (B, C, D
> appears, the radio base station 30 (B, C.

Wireless base stations 30 (B) along the road as groups D and E).

C, D, E) (referred to as high-speed mobile mode radio base station)
It has the function of identifying and storing only the The radio base station for high-speed movement mode is a mobile radio 1 in high-speed movement mode.
50 (B, C, D>) does not appear in the vicinity, or if call traffic is quiet, a normal wireless base station 30 (B, C,

The same operation as in D, E) is performed, except that the high-speed mobile radio 150 (B, C, D) is connected to the current T6 and the barrier exchange 120 or the mobile radio 50 (B.

Mobile radio device 50 in high-speed movement mode according to instructions from C, D>
(It has a function dedicated only to communication with B, C, D>.

Therefore, the mobile radio device 50 (B, C
, D>, the gateway exchange 1120 connects the wireless base station 3 for high-speed mobile mode that is currently communicating.
0 (B, C, D, E), as well as nearby high-speed mobile mode radio base stations, monitor and receive signals transmitted from the high-speed mobile radio equipment 50 (B, C, D). , to report the measurement results to the barrier exchange 20. The gateway switch 20 compares these, estimates the speed (velocity, direction) of the mobile radio/wireless device 50 (B, C, D>) in high-speed movement mode, and uses the result as the speed (speed, direction) of the mobile radio/wireless device 50 (B.

A notification is sent to the high-speed movement mode radio base stations 30 (B, C, D, E) located in the direction of movement of C, D>. As a result, compared to the normal low-speed movement mode, the mobile radio 50
Even if (B, C, D) are moving at high speed, it is possible to secure communication. Also, depending on the system, whether the mobile radio device 50 (B, C, D>) in high-speed movement mode or the radio base station 30 (B, C, , D, E).

Below, a mobile radio device 50 in high-speed movement mode (B.

An example of location registration and call/call operations of C, D> will be explained using specific numerical values.

Assume that the mobile radio devices 50 (B, C, D>) are installed in a car, and the speed of the car is 110/hr. This speed is quite high and can be considered as the speed on a highway. In the system according to the present invention, this value is adopted in order to allow some leeway in the design.

The above value corresponds to 30 m/s.

If a car at this speed travels through an oblong zone in Figure 14A, it will take 300 m x 2 to pass through one zone.
/30m = 20 seconds. However, since it is unknown from which location in the small zone the location registration and calls made and received from the mobile radio 150 (B, C, and D) are initiated, for example, if it is started at point A in FIG. 14A, In order to immediately move to the adjacent zone, the wireless base 7430 for fast movement mode at point P2 (B, C, D, E
) will soon become impossible to communicate with.

Next, if we start at point B in Figure 14A, point P2
Communication with wireless base stations 30 (B, C, D, E) is approximately 2
This will last for 0 seconds, and in this case, depending on the system conditions, the operation may be almost the same as the low-speed movement mode. Actually, it is considered to be somewhere in between, 1
four high-speed mobile mode radio base stations 30 (B, C, D,
The average communication time with E) can be considered to be 10 seconds. Also, depending on the system, as shown in FIG. 14A, other wireless base stations 30 (B, C, D, E) are connected to points QO, Q1. Q2 and will have overlapping service zones (not shown), which may be used for diversity. The above explanation is simple, so
An explanation of this diaperity has been omitted.

Next, communication in the radio section between the mobile radio device 50 (B, C, D>) and the radio base station 30 for high-speed moving mode (B, C, D, E) and the radio base station 30 for high-speed moving mode
(B, C, D, E) and the gateway exchange 20 will be explained about the time required for transmitting and receiving signals for communication (location registration, originating/receiving calls) in a wired system.

First, regarding the wireless section, we will consider the time required for control signals when the mobile radio devices 50 (B, C, D) take the lead, such as in location registration or call origination. A digital signal is used as the signal format, and the signal speed is 1200 bits/second. The transmission signal from the mobile radio device 50 (B, C, D> for location registration includes a 40-bit [) code as well as a control type 2
It includes a 0 bit, a preamble, a start signal, and a test signal, and can be considered to be a maximum of 200 bits. Therefore, the time required to send the signal is 200/12
00-0.16.7 seconds, or approximately 170 m5ec.

On the other hand, high-speed movement mode radio base stations 30 (B, C.

The control signal from D, E) to the mobile radio device 50 (B, C, D> is also about 170 m5ec at maximum. Also, since the time required for wired signal transmission and reception is shorter than that of wireless system, position The total time required for registration is less than 2 seconds in a typical system.

Similarly, the time required to make a call is less than 2 seconds.

Incoming calls usually take less than 2 seconds, but mobile radio 11i
If 50 (B, C, D) is performing intermittent reception to save power, the required time may be longer and may take about 5 seconds.

In any of the above cases, when considering only the required time, even if control signal transmission and reception in the normal mode, that is, the low-speed movement mode, is used, it can be sufficiently implemented in the high-speed movement mode if there are no other deteriorating factors. It became clear.

However, as will be described later, when digital control signals are transmitted in high-speed movement mode, transmission characteristics deteriorate due to fading effects and the like.

In order to improve this, the following method is adopted.

i) Sending the same signal repeatedly (retransmission).

ii) changing the signal speed to a value suitable for high-speed movement mode;

iii) Change the signal format to one suitable for high-speed movement mode.

iv) Strengthen the error correction function.

V) Introducing various diversity technologies such as space diversity and frequency diversity.

The above techniques will be collectively referred to as a high-speed movement mode control signal sending method. While the transmitting section sends out a signal in the above mode, it is natural that the receiving section of the opposing radio device applies a corresponding receiving method. The methods include: i) Reception is possible regardless of high-speed or low-speed mode.

ii) Immediately before mode conversion, notify the other party of the mode conversion using a control signal.

iii) For the fixed time timing, for example, try receiving the signal in a low speed mode, and if the signal cannot be received satisfactorily, change to another mode and receive the signal.

iv) Prepare two types of receivers, one for high speed and one for low speed.

There are various methods such as

The above-mentioned technologies are those that are employed in various systems to which the present invention is applied, and not all of the above-mentioned technologies are necessarily employed.

For example, the simplest of these is increasing the number of retransmissions of the same signal, and this alone can be expected to have a significant effect.

Below, among the above measures, transmitting and receiving diversity is applied (
However, regarding channel switching during a call, a method of increasing the number of retransmissions of the same signal will be specifically explained.

In this case, the control signal transmission/reception method adopted in the small zone system, that is, the wireless base station 30 (B, C, D, E
) and mobile radio equipment 50 (B, C.

D) There are the following types of channels used as control channels with other control channels used in adjacent zones.

a) System using the same control channel as the adjacent zone In this case, in slow moving mode, the radio base station 30 (B
, C, D, E) are sent from other nearby wireless base stations 30 by signals from the channel control unit 21.
(B, C, D, E), or
Alternatively, they are transmitted sequentially with a time difference (one transmitter is in operation).

On the other hand, the uplink control signal transmitted by the mobile radio device 50 (B, C, D> uses the control channel corresponding to the downlink control signal (the transmitter sends out the control signal using one control channel) .

However, in high-speed movement mode, one wireless base station 3
0 (B, C, D, E) from multiple transceivers (or 11 transceivers that transmit and receive the same function in time division) on the same channel simultaneously or , are transmitted sequentially. Mobile radio device 50 (
When this is received by B, C, D>, there will be a kind of space-diaperity effect if it is based on multiple transmitting and receiving sources, and a time-diaperity effect will be 1q if it is based on a single time-sharing transmitter and receiver. Become. In addition, the same signal is transmitted from the surrounding radio base stations 30 (B, C, D, E) at the same time or sequentially according to instructions from the channel control unit 21. City effects are multiplied. - side, mobile radio device 50 (B
, C, D) are sent to the mobile radio R50 (B
, C, D) are used to transmit the same signal using the same control channel, either simultaneously or with a time difference, so the transmission diversity effect can also be obtained in this case. .

b) A system that uses a separate control channel from the adjacent zone. In this case, in slow moving mode, the radio base station 30 (B
, C, D, E) can be transmitted without taking into consideration the transmission of control signals from the surrounding wireless base stations 30 (B, C, , D, E), especially at barrier stations. There is no need for instructions from the exchange 1120, and the mobile radio 50 (
A plurality of wireless base stations 30 (B, C, D)
, D, and E) simultaneously or randomly. In this case, each wireless base station 30 (
B.C.

The transmitters used in D and E) are 1 flil each. On the other hand, the uplink control signal from the mobile radio device 50 (B, C, D) uses the uplink control channel corresponding to the currently received downlink control channel (control signal from the transmitter using one control channel). However, in high-speed movement mode, one wireless base station 30 (B, C, D
, E), the same signal is simultaneously or sequentially transmitted through a plurality of control channels from a plurality of transceivers (or one transceiver having the same function as the plurality of transceivers). Wireless base stations 30 (B, C, D) in the vicinity.

A similar operation is performed in E). However, in order to avoid radio wave interference, the transmission timing information is transmitted from the barrier switch 20 to each wireless base station 30 (B, C, D).

It is sent to E). On the other hand, mobile radio device 50 (B.

In C, D>, all the receivers of the mobile radio devices 50 (B, C, D> are in a standby state so as to receive each of a plurality of control channels, and a transmitting/receiving diversity effect can be obtained. Mobile radio device 50 (B, C,
The uplink control signal from D> is transmitted to the mobile radio device 50 (B, C,
Since the same signal is transmitted simultaneously or with a time difference using all the transmitters equipped in the mobile radio device 50 (B, C, D> The radio base stations 30 (B, C, D, E) can receive the signal, and the transmission/reception diversity effect can also be obtained.

As explained above, it has become clear that in high-speed movement mode, a diversity effect can be obtained for control signal transmission and reception.
The reason why it is not used in the low-speed movement mode in state D) is as follows.

i) Effective use of frequencies In the high-speed movement mode, the wireless base stations 30 (B, C.

D, E), mobile radio device 50 (B, C, D> will use many radio channels, and other mobile radio device 5
0 (B, C, D) may cause radio wave interference, or there may be a time delay in transmitting call signals to avoid radio wave interference.

i) Low power consumption, especially small mobile radio devices such as mobile phones 50 (B
, C, D>, it is desirable to reduce the transmission power temporally or quantitatively in order to reduce the burden on the battery as much as possible.

Therefore, it is desirable for the system to be in low-speed movement mode, and all mobile radio B150 (B, C) are in this state.

D), the optimal control method has been determined with the goal of effectively using frequencies, increasing subscriber capacity, and minimizing the impact on other communications, but in high-speed movement mode, these This is because the design philosophy has been changed slightly from the optimal conditions to improve the reliability of signal transmission to mobile radio equipment 50 (B, C, D>) that is communicating in high-speed movement mode.However, from the overall system Considering, the number of mobile radios 50 (B, C, D) in high-speed movement mode is the same as the number of mobile radios 50 (B, B, C, D) in low-speed movement mode, which is the normal mode.

This is an extremely small number compared to the numbers of C and D>.

- For example, in the 23 wards of Tokyo, the above-mentioned document (Ito ``Study of mobile phone systems - Focusing on wireless line control and routing, IEICE telephone system study group C887
-18 May 1987), in a system with 7 million mobile phones, the number of mobile phones installed in cars is estimated to be less than 10% of the total, and in reality it is estimated to be around 5%. Therefore, even if the mobile radio device 50 (
Even if techniques such as retransmission are used to improve the reliability of signal transmission for B, C, and D), it will only slightly impede the effective use of frequencies as a whole, and it will not be a particular problem.
It is thought that there is no q.

Next, mobile radio 150 (B, C
, D> and the radio base 830 for high-speed movement mode (B, C,
A method of transmitting and receiving signals between the terminals D and E) will be explained.

As will be described later, the mobile wireless device 50 (B, C, D
) or wireless base station 30 for high-speed movement mode <E3. C
, D, E), this mobile radio 1150 (B, C
, D) is determined to be in high-speed movement mode, and the following control signal sending method is adopted. Below, location registration 2 making and receiving calls 1
This will be explained in the order of channel switching during a call.

(A) Location registration Mobile radio l1150 in slow movement mode (B.

The location registration signals from C and D) are normally transmitted repeatedly once or multiple times, but this is determined by the system settings. The location registration from the mobile radio device 50 (B, C, D> may or may not recognize whether it is in high-speed movement mode or not, but below we will assume that it does not recognize it. , will be explained using the flowcharts of FIGS. 10A to 10F.

In the home area where the mobile radio devices 50 (B, C, D>) are permanently installed, or in the roam area which is an area within the service other than the home area, the gateway switch 20 and the surrounding wireless base station 30-1 are already connected. .30-2.
When the mobile radio 50 (B
, C, D) is turned on to start operation, the first thing that is performed is a location registration operation.

When the power switch of the mobile radio device 50 (B, C, D> is turned on, a signal to start an operation for registering the current location is transmitted to nearby radio base stations, e.g., using an uplink control channel (CH). 30-1 (S401
, Figure 10A).

Upon receiving the operation start signal from the mobile radio device 50 (B, C, D> (S402), the radio base station 30-1 confirms the start of operation of the mobile radio device 50 (B, C, D>).
403), and if the downlink control channel is off (S403 YES), it is turned on and permission to send a location registration signal is sent out using the downlink control channel (3404).

Upon receiving permission to send a location registration signal (3405), the mobile radio device 50 (B, C, D> transmits a location registration signal with its own ID (identification number) using the uplink control channel (3405). 8406).

Upon receiving the location registration signal (3407), the wireless base station 3
At 0-1, the reception quality is inspected and the ID is stored in the ID identification storage section 34 (5408). If the result of inspecting the reception quality is above a certain value (S409YES, 108th
), a location registration request signal is sent to the barrier switch 20 (S410). This registration request signal was received (S4
11) In the barrier switch 20, a plurality of wireless base stations 30-1
- Register that the reception quality and location are stored in 30-n (S412>. When this registration work is completed,
A σ recording completion signal is sent (S413). The radio base station 30-1 that has received this registration completion signal transfers it to the mobile radio device 50 (B, C, D>) using the downlink control channel (414).

Successfully received registration completion signal (3415, 3416)
The mobile radio device 50 (B, C, D> inspects the received content, stores the registered ID of the radio base station 30-1, and ends the location registration operation (S417).

However, since the mobile radio equipment 50 (B, C, D>) is moving at high speed, the radio wave propagation characteristics are poor, and normally this signal is received from the nearest radio base station 30-1, but it cannot be received well. (8416NO>. Therefore, after a certain time timing, the mobile radio 50 (B, C,
D>, the transmission of the same location registration signal is resumed (34
18). The radio base station 30-1 receives the retransmitted location registration signal (3419), inspects the reception quality, and stores the ID in the ID identification storage unit 34 (S420, FIG. 10C). If the received quality is above a certain value as a result of checking (8417 YES), a location registration request signal is sent to the gateway exchange 20 (3418, Fig. 10C). Upon receiving this registration request signal (S423), the gateway exchange 20 registers that the reception quality and location are stored in the wireless base station 301 (3424). When this registration work is completed, a registration completion signal is sent (8425). The wireless base station 30-1 that has received this registration completion signal uses the downlink control channel to send the mobile wireless device 50 (B, C, D)
(3426).

If the mobile radio device 50 (B, C, D>) cannot be received well or cannot receive (3427,
3428NO), attempts are made to receive the registration completion signal until a certain period of time has elapsed, but once the certain period of time has elapsed, if the number of defective receptions has not reached the specified number n (for example, n = 3), (8429NO>
, repeating the operations from steps 5418 to 5428,
Although there is a very small probability, if the predetermined number of times n has been reached (S429YES), the mobile radio 50 (B.

C, D> determine that they are moving at high speed, and decide to perform diversity transmission and reception of control signals according to the control signal transmission method for high-speed movement mode (5430), and use multiple or one control channel (CH). In order to measure the position registration signal and moving speed with the same contents, we will send a request to measure the electric field strength to the nearest wireless base station 30-1.30-2.3.
0-3 (S431, FIG. 10D), and waits for reception on the control channel (S432).

This speed measurement request signal is sent out at regular intervals and includes information indicating that the vehicle is in high-speed movement mode.

The nearest wireless base stations 30-1 and 30-2, which received this measurement request and the location registration permission signal (34
33,3434>, if the reception condition is good (S435YES, 5436YES), the mobile radio 5
0 (B.

It is recognized that C and D) are in high-speed movement mode.

(3437, 3438>.

The radio base station 30-1.30-2.30-3 measures the electric field value of the signal sent from the mobile radio device 50 (B, C, D) at regular intervals and uses the measurement result to determine the position. It is sent to the gateway exchange 20 along with the registration request signal (S
439.3440. Figure 10E).

Upon receiving the received electric field value and the location registration request signal, the barrier exchange R20 detects each wireless base station 30- from the change in the received electric field.
Mobile radio 50 for 1.30-2.30-3 (B
, C, D) and compare them to obtain the speeds of the mobile radio device 50 (B, C.

D) is moving in the direction of the wireless base station 30-1.30-2.30-3 at speeds V1, V2, and V3 (S441). This speed information report is immediately sent to the wireless base stations 30-1, 30-2 and the registration completion signal.
30 to 3 (8442), and stores that the location registration of the mobile radio 50 has been accepted in high-speed movement mode (3
445, Figure 10F).

The wireless base station 30-1.30-2.30-3 receives the speed information and the registration completion signal, stores it, and transfers it (S443
, 444, 5446, 3447>.

If the mobile radio device 50 (B, C, D) successfully receives the location registration completion signal and speed information (844B, 5
449YES), wireless base station 30-1.30-2.3
Memorize each ID of 0-3 and end the location registration operation (S
450).

The mobile radio l150 (B
, C, D> is (3
449NO), if the number of defective receptions has not reached the predetermined 0 times (for example, n=3), (3451NO)
, either abandons location registration or shifts to wide area calling mode and concentrates on receiving control signals for wide area calling that can only receive calls (S452). Regarding a call in this wide area call mode, the location registration disclosed in Japanese Patent Application No. 62-329022 by the present applicant requires a high movement speed, so
Location registration is not effective. For this purpose, the direction and speed of movement are measured and the speed information is used.

In the operation of the present invention in this high-speed movement mode,
Reception of signals from the radio base stations 30 to 1.30-2.30-3 is much easier than in the case of low-speed movement mode.

It is a mobile radio 11150 (B, C
.

The nearest radio base station 30-1.30-2.30-3 that received the location registration operation start signal from D) detects the mobile radio equipment 50 (B, C, D) included in the signal. Based on the speed information, it is recognized that the mobile radio device 50 (B, C, D> The transmission method according to the signal transmission method is executed.In this signal, the radio base station 30-1.30-2.30-3 transmits the signal to the mobile radio 50 (B, C, D> Information indicating that it is a response signal is included.By such a measure, the mobile radio device 50 (B, C, D> is the radio base station 30-1
．． It becomes much easier to receive the location registration signal transmission permission signal from 30-2 and 30-3 than usual.

In addition, in the transmission/reception diversity in high-speed movement mode, for the barrier exchange 1N 20, the mobile radio device 5
0 (B, C, D>) is moving at high speed, which is effective for making/receiving calls and switching channels during a call, which will be described later.For example, even if the location registration is completed, the mobile radio 50 From (B, C, D), location registration is repeated at regular time intervals such as every 30 seconds or every minute, so that incoming calls are reliably executed.

Roughly speaking, in the present invention, the gateway exchange 20 that has accepted the location registration from the mobile radio device 50 (B, C, D>) in the high-speed movement mode manages the registration file separately, and Radio equipment 50 (B, C, D>
, D, E) (these belong to any of the plurality of subsystems set in the service area where the high-speed movement mode described above occurs) is hit by v1 when a call is made or received.
As explained below, it is possible to make and receive calls reliably even when moving at high speed.

FIG. 14B and FIG. 14C show a high-speed mode subsystem group S1. S2゜S3. ...-
310 is shown. Within each of these subsystems are one or more wireless base stations 30 (B, C.

D and E) are accommodated, but it is assumed that their service zones correspond to the service zone of one subsystem. Each subsystem has identification information (ID>).Specifically, the ID of the wireless base station 30 (B, C, D, E) accommodated in each subsystem is
In D, the subsystem common ID and the wireless base station 30
(B, C.

D, E) This is possible by having a unique ID as well.

On the left and right roads in FIG. 148, from left to right, subsystems 52S3, 53S4, 54S1, 51S
2. An example is shown in which the settings are as follows.

Points p1=P2, P3, "', P99.P100 are the wireless base stations 30 (
B.

C, D, E) positions are shown. Each radio base E30 (B, C
, D, E) are shown in Figure 14C (b).
) to (e). In case of (b), the wireless base stations 30 (B, C, D) installed in the service area of subsystem S1.

E) position is Pl, P5. P4. , (n=1
．． 2. -24) and covers the area designated as subsystem S1 on the road surface. Similarly, subsystem S2 in (C), S3 in (d), and S4 in (e) respectively cover the indicated area. In addition, mobile radio equipment 50 (B,
The positions of C, D> are P2, P6゜Pl(>, =P
(n=1.2.-..., 24) (S2
), 4n+2 P3, P7, Pll, -, F'4n+3 (
n□1,3. ..., 24) (above S3), P4. P
8. P12... P4o+4 (n=0.1...,
24) (above S4).

FIG. 14C (a>) shows nine combined service zones (b) to (e) of the same figure. Similarly, subsystems are placed on the passages running up and down in FIG. 14B.

If the zone ID of the subsystem is retrieved from a car moving at high speed from left to right in the passage running left and right in FIG. 14B, the result will be as follows. That is, Sl, S2.
S3. S4: Sl, S2°S, S and S to S4 appear cyclically. Also, as is clear from Figure 14C,
Two or more of each subsystem overlaps, and diversity transmission and reception is possible.

Now, assume that the mobile radio device 50 (B, C, D> is at point A in FIG.
Wireless base station 30 (B.

C, D, E), but Figures 10A to 1
As explained in the 0F diagram, the mobile radio device 50 (B, C, D
＞ and barrier switch 20 are mobile radio devices 50 (B, C, D
The speed (direction and speed) of > is recognized (it is moving to the right in Fig. 148), and this will be utilized when making and receiving calls.

That is, in the case of location registration, the size of the service area of the subsystem and the mobile radio 50 (B.

C, D) Mobile radio device 50 (
This is because it is possible to estimate the positions of B, C, and D) with considerable accuracy.

Further, according to the present invention, it is easily possible to allocate radio channels for use by mobile radio devices 50 (B, C, D) in high-speed movement mode without radio interference. Mobile radio in high-speed movement mode shown in Figure 15 below! 450
(This will be explained using a radio channel allocation diagram for B, C, D>.

In FIG. 15, there are ten groups of subsystems, and one control channel and six communication channels are assigned to each subsystem.

In this example, the wireless channels assigned to each subsystem, both the control channel and the speech channel, are different, so as long as there are no identical subsystems nearby, wireless interference will not occur even if any subsystems are overlapped or placed close to each other. become.

A case in which the wireless channel shown in FIG. 15 is applied to the road subsystem shown in FIG. 14B will be described below. In the left and right passages, subsystem S1. Although S2, S3 and S4 are used, the same subsystem, for example Sl, is used across the two subsystems, and practically no radio interference occurs. Next, on roads leading from top to bottom, S
4. S5, . . . =S10 subsystems are used. In this case, since the same subsystem is reused across five subsystems, no radio interference will occur. Roughly speaking, the area near the intersection of the right and left passages and the upper and lower roads is a problem. For example, subsystem S4 is used for both, but as is clear from the figure, the area where the two subsystems are separated is Since it is being reused, no radio interference will occur again.

The above explanation assumes that the degree of overlap between subsystems is 2. Similarly, it is also possible to have a multiplicity of three or more, generally n. However, due to radio interference, the number of subsystems must be 20 or more because the number of identical subsystems is small and the number of subsystems must be spaced apart from each other. Furthermore, considering the use of subsystems near road intersections, it is necessary to prepare at least 3n subsystems. .

By the above method, it is possible to satisfy the strong demand for channel allocation free of radio interference, which is generally desired in mobile radio systems, and in particular, the demand for mobile radio systems that move at high speed. Note that, for effective use of frequencies, it is of course possible to share the radio channel used in the high-speed mode and the radio channel used in the low-speed mode shown in FIG. 15. However, if radio interference occurs between the two, the mobile radio device 50 (B, C, D>) in low-speed mode (or the radio base station 30 (B, C) communicating oppositely).

In D, E)), it is desirable to immediately switch to another channel and give priority to the mobile radio device 50 (B, C, D>) that is moving at high speed with respect to the use of the radio channel.

In addition, in the above explanation, we have taken as an example a system in which carrier synchronization is not performed on the same radio channel, but in a system in which carrier synchronization is performed, it is possible to share the control channel shown in Fig. 15, and to switch between channels during a call. If there is no risk of wireless interference in the vicinity,
There are advantages such as being able to carry old channels into adjacent zones.

Note that the mobile radio device 50 (B, C) is in high-speed movement mode.

D) may suddenly change to low-speed movement mode.

A person getting off the moving vehicle uses mobile radio equipment 50 (B, C).

This applies to cases such as carrying D). In this case, the above-mentioned signal transmission for location registration will continue even though the high-speed movement mode has shifted to the low-speed movement mode. In order to prepare for this case, the radio base station 30-1 that has received the location registration signal from the mobile radio device 50 (B, C, D) transfers it to the barrier exchange [20], and the gateway exchange 17M20 that received it Then, when it is determined that the same location as the last memorized location registration or a large movement is not permitted, the mobile radio 50 (B, C, D>) is transferred to the low-speed movement mode via the radio base station 30-1. This will be notified and the repeated execution of location registration will be stopped.

Alternatively, depending on the system, if a downlink control signal is constantly or intermittently sent from the wireless base station 30-1, the mobile wireless device 50 (B).

In C, D), by receiving this, own ID
- The same objective can also be achieved by searching the roam area information collation storage unit 54 and notifying the gateway exchange 20 of the result.

<B) Calling operation The calling operation from the mobile radio 50 (B, C, D) in the high-speed movement mode will be described.

In the location registration operation already described, the mobile radio device 50
(B, C, D) There are cases in which the devices themselves recognize that they are in high-speed movement mode, and cases in which they do not. The latter case would be, for example, when a user gets into a car and makes a call after registering their location. The latter case will be explained below using the diagrams shown in FIGS. 11A to 11H, but the former can also be included therein.

The mobile radios 50 (B, C, D) (hereinafter simply referred to as mobile radios 150) start operating, and the radio base stations 30-1.30-2.30-3 and gateway exchange 20 that communicate with them also start operating. The operation has already started, and the location registration explained in FIGS. 1OA to 10F has been completed.

The handset of the mobile radio 50 is picked up (off-hook), and the off-hook signal and the ID (identification number) of the mobile radio 50 are transmitted using the uplink control channel (CH) (3501, Figure 11A> This mobile radio device 50I,
Since the mote does not know that it is moving at high speed, it sends an off-hook signal using a normal slow-moving mote.

Upon receiving the off-hook signal, the wireless base station 30-1 detects the ID of the mobile wireless device 50 and confirms that it is already registered in the ID identification storage unit 34 (3502).
．． ,).

Therefore, the radio base station 30-1 adds the reception quality value and the current empty channel number from the mobile radio 50, and sends it as a call response signal using the downlink control channel (35
03). At the same time, the radio base station 30-1 checks whether the ID signal from the mobile radio 50 has been successfully detected (3504), and if it has not been successfully detected (3504 NO>), the ID signal is turned off. The user waits for the hook signal to be sent again.The call response signal from the radio base station 30-1 is received by the mobile radio t150 (S505>, and if the reception quality is not good or it cannot be received at all) If 8506 NO>, the calling signal is repeatedly sent at a predetermined interval up to a predetermined number of times (3507 NO).

3501-3506).

If the detection signal of the call response signal is good in the wireless base station 30-1 (S504YES) and the mobile radio device 50 receives the call response signal well (S506YES).
), steps 3233 (FIG. 5A) to 3252
The process moves to the operation shown in FIG. 5B.

When the sending of the calling signal reaches the specified number of times (3507YES)
), the mobile radio 50 recognizes the high-speed movement mode and determines to perform diversity transmission and reception of calling signals in the high-speed movement mode using the control channel (3508
, Fig. 118). Therefore, the mobile radio device 50 simultaneously transmits an off-hook signal (calling signal) and a speed measurement request with the same content on multiple or one control channel, and waits for reception on the control channel (3509).

Radio base station 30-1 and surrounding radio base stations 30- that received this off-hook signal and the speed measurement request signal
2.30-3 (8510, 3511), if both signals can be received well, (S512YES)
,'5513YES), Wireless base station 30-1.30-2
．． 30-3 recognizes that the mobile radio 'R50 is moving at high speed, so it notifies it of the number of a free communication channel for high-speed movement mode and prepares to make a call using that channel. Instructing empty channel information to the mobile radio 50 using multiple control channels or one control channel.
The mobile radio device 50 receives this empty channel information for high-speed movement mode with diversity (S516). This empty channel information includes call channel C for high-speed movement mode.
It includes that I-(101 and Cl-1102,C)-1103 are vacant.

At wireless base stations 30-1 and 30-2.30-3, which successfully received the speed measurement request (S512YES, 5513Y
ES, Fig. 118), CHl as an empty channel, respectively.
ol (for wireless base station 30-1>, CH102 (for wireless base station 30-2), CH103 (for wireless base station 30-3)
The suitability of the field strength and the results of the electric field strength measurement are
20 (3517.3518, Figure 11C).

This electric field strength measurement result and empty channel information are sent to the wireless base station 3.
Gateway exchange 20 received from 0-1.30-2.30-3
is based on the change in the received electric field of each radio base station 30-1.30-2.30-3.
The speed of the mobile radio device 50 with respect to the radio base station 30-1.
Velocities V1 and V in the directions of 30-2° and 30-3, respectively.
2. Calculate that the vehicle is moving in V3 (S519
). This information is immediately transmitted to the radio base station 30-1.30-
2.30-3 (S520).

The radio base station 30-1.30-2.30-3 receives the speed information from the barrier exchange 120 and records it (352
1.3522).

The mobile radio device 50 that has received the call response signal including empty channel information (S516, Fig. 11C) checks whether or not it was successfully received (S523, Fig. 11D). Alternatively, if the call cannot be received at all after a predetermined period of time has elapsed (NO in 3523), the process returns to step 5501 (FIG. 11A) and repeats sending the off-hook signal. If the off-hook signal cannot be sent, the call will probably be abandoned.However, the possibility of such a situation occurring is extremely rare, and normally the call will be terminated by repeating this off-hook signal. It will be possible to successfully receive the response signal (S523YES, FIG. 11D).

When the mobile radio device 50 successfully receives the call response signal, the mobile radio device 50 selects an empty channel CH101 (for radio base station 30-1>, C
Please check H102 (for wireless base station 30-2) and CH103 (for wireless base station 30-3). 3524>, if you wish to use the indicated channel (it is not necessary to use high-speed movement mode), Send a signal specifying channel CH101 etc. for high-speed movement mode 5525),
Radio base station 30-1.30-2.30-3 that received this
Then, confirm that the designated channels (CH101-103) are free and switch to the designated channels (3526.
3527) At the same time, send a channel switching completion report to the mobile radio 50 on the downlink control channel. 5528.8529
), when the mobile radio device 50 confirms this, the radio base station 3
0-1.30-2.30-3 from the barrier switch 20 as a dial tone (S5
31, Figure 11E・)・.

When the radio base station 30-1.30-2.3C)-3 sends a channel switching completion report to the mobile radio 50, it requests the gateway exchange R20 to send a call signal 353.
2.3533>, The barrier switch 20 that received this request is a mobile radio! The ID of the fi50 is detected, the communication quality is stored in the ID identification storage section 24, and the communication path control section 21 controls the switch group 23, e.g., 5W1-1, 5W1-2, 5.
Turn on W1-3 and connect to wireless base station 30-1.30-2.3
0-3 to the exchange 11 of the telephone network 10 (S534
).

Therefore, a dial tone is sent from the exchange 11 side via the switch group 23 of the barrier exchange 20 (353
5).

This dial tone is the wireless base station 30-1゜30-2
．． 30-3 to channels CH101, Cl-1102,
Transferred by CHl 03 (down) (S536,
3537), is received by the mobile radio 50, and confirms that a call (channel) has been established (3538).Mobile radio 1
50 transmits the dial signal of the destination to channels CH101,C
Send using H102, CH103 (upstream) 853
9, Fig. 11F), wireless base station 30-1.30-2.3
0-3 (3540, 5541), the exchange 11 operates and a communication path to the destination on the telephone network 10 is established (S542). After that, a call is made (S
543).

When the call is completed, the handset goes on-hook (3
544), on-hook signal and end-of-call signal are mobile radio! f
150 to channels CH101, CH102, CH10
3 (uplink) (3545>. This causes the wireless base station 30-1゜30-2.30-3 to confirm the end of the call.
tell to. Therefore, in the barrier exchange 120, the switches 5WI-1, 5WI-2, and 5W1-3 of the switch group 23 are turned off, and the call using diversity transmission and reception in the high-speed movement mode is terminated (3548>).

In the above explanation, it was assumed that the number of radio base stations communicating with the mobile radio device 50 (B, C, D> is 30-1.30-2.30-3, but in reality, there are roughly many radio base stations 30-1.30-2.30-3). (8
, C, D, E) at the same time.

In other words, this is to perform diversity transmission and reception, as explained in the calling operation in the low-speed movement mode. Therefore, the designation of the communication channel for high-speed movement mode is
0-1, for example, channel CH101, and radio base station 30-2, for example, channel CH102, . . .
...and so on, each wireless base station 30 (B, C, D, E)
are specified one by one. As a result, subsequent signal transmission is limited to the radio base station 3 due to the diversity effect.
0 (B.

C, D, E) and the mobile radio 50 (B, C, D) are improved due to the diversity effect.
Normally, there is no need to apply the control signal sending method of the high-speed movement mode, and the transmission method is almost the same as that of the low-speed movement mode (except for the mobile radio 50 (B).

It is sufficient that the control signals sent from C, D> include information indicating that it is a high-speed movement mode.

(C) Incoming call operation The flow of the incoming call operation to the mobile radio 50 (B, C, D> will be explained using FIGS. 12A to 12F. mobile radio device 50
(B, C, D>, etc. are all wireless base stations 30 (B, C
, D, and E).

Here, the mobile radio devices 50 (B, C, D> (hereinafter simply referred to as mobile radio devices 50) may recognize whether or not they are in the high-speed movement mode, but it is assumed that they do not have this recognition. explain.

In FIG. 1A, it is assumed that an incoming call signal addressed to the mobile radio 50 enters the barrier switch 20 from the telephone network 10. It is assumed that the ID identification storage unit 24 in the barrier switch 20 inspects incoming call signals and searches for the ID of the called party, and finds the wireless base station 30 (plurality) whose current location is registered. . In this case, the location of the mobile radio device 50 should have been registered in low speed mode. Then, an incoming call signal is simultaneously sent via the communication path control unit 21 to all the radio base stations whose locations are registered to the mobile radio 50, for example, 30-1.30-2.30-3 (S601, Figure 12A).

Each radio base station 30-1, 30-2, which received this signal.
30-3 searches the ID identification storage unit 34 (C) in its own station and confirms that the ID of the mobile radio 50 is stored there, and then sends a message to the mobile radio 50 using the downlink control channel. An incoming call and communication channel designation request signal is sent with the ID of the radio base station 30-1.30-2.30-3 added (3602, 603, 604).

The mobile radio 1150 was unable to receive the incoming call signal from the radio base station 30-1.30-2.30-3 (3607NO>), and the radio base station 3
0-1.30-2.30-3, even if a predetermined period of time elapses after receiving an incoming call response from the mobile radio device 50, the radio base station 30-1.3
If 0-2.30-3 is not received (S605, 56
06) Repeat sending of the incoming call signal until reaching a predetermined number of times (3608, 5609, Fig. 128).

The mobile radio 50 successfully receives the incoming call signal (S607YE)
S) The incoming call response from the mobile radio device 50 is sent to the radio base station 3.
If 0-1.30-2.30-3 is received (S60
5YES, 5606YES), step 3273 (6th
The process moves to the operations shown in FIG. A) to 8298 (FIG. 6C). The barrier exchange R20 is also the wireless base station 30-1.30-
2.30-3 and the mobile radio device 50 operate to enable communication.

As a result of repeating the sending of the incoming call signal until reaching the specified number of times, when the sending of the incoming call signal reaches the specified number of times (S608
YES, 5609YES), wireless base station 30-1.3
At 0-2.30-3, the mobile radio device 50 determines that it is outside the service zone of the radio base station 30-1, 30-2, 30-3, or is moving at high speed. The gateway exchange 20 is informed that the call receiving method for the mode should be adopted (S610, S611).

As a result of receiving and analyzing information from each wireless base station 30-1.30-2.30-3 that indicates that the mobile wireless device 50 is moving at high speed (3612), the barrier switch 20 determines that the mobile wireless device 50 is moving at high speed. It appears that aircraft 50 is moving at high speed (5613)
, to search the ID identification storage unit 24 and check whether the mobile radio device 50 has registered its location in high-speed movement mode 3614;
(Fig. 12C), if the location is still not registered in high-speed movement mode (3614 NO>, shift to wide area calling mode 3615), concentrate on receiving control signals for wide area calling that can only receive calls (S615). .

On the other hand, the mobile radio device 50 is currently performing location registration operations at regular intervals, and should have completed location registration in the high-speed movement mode. Assuming that the radio base station whose location has been registered as a result is 301.30-2.30-3, this fact is stored in the gateway exchange 20.

If the mobile radio device 50 is in high-speed movement mode and has been changed to location registered (3614YES), the location registered radio base station 30-. 1 (in this case, the wireless base station 30
Naturally, in most cases it is different from the previously registered wireless base station 30-1, but it is the same wireless base station 30-1.
It was assumed that The same applies to 30-2 and 30-3. ), and a radio base station 3 existing in the direction of movement of the mobile radio device 50
0-2.30-3, preparations for communication using empty channels among communication channels with good propagation characteristics designated for high-speed movement mode, application of diversity transmission and reception, and mobile radio The gateway exchange 20 sends a signal to the wireless base station 30-1.30 requesting to measure the field strength to measure the speed of the mobile wireless device 50 and to send an incoming call signal in high-speed movement mode to the mobile wireless device 50. -2,3C)-
3 (S616).

The radio base station 30-1.30-2.30-3 receives the empty channel preparation, the application of diversity transmission/reception, the field strength measurement for speed measurement, and the request to send an incoming call signal. The signal and empty channel information are transmitted to the mobile radio device 50 using a plurality of control channels or one control channel under the control of the speech path control unit 21 with shifted transmission timings (S617, 3618
) This incoming call signal etc. is received by the mobile radio device 50 in standby on the high-speed movement mode control channel (S619), and the quality and content of the received signal are searched to determine whether the incoming call signal is good or not. The call signal is examined (S620), and the call signal is confirmed to be addressed to the mobile radio device 50 (3621).The mobile radio device 50 calls each radio base station 30-1 in consideration of the nearby call traffic state. .30-2.30-3 and communication channels such as CHlol.

CH102, C)-1103 is determined, and the wireless base station 30-1.30-2°30-3 is determined using the uplink control channel.
(8622, Figure 12D).

At the same time, each synthesizer 55-1.55-2 and 56-1.56- in the mobile radio device 50 (FIG. 1B)
2. ..., 56-n and selector switch 64-1.64-
2 and reception and transmission switching controllers 65C and 67C, for example, communication channel CH101 (for wireless base station 30-1), communication channel CH102 (for wireless base station 8
30-2), communication channel CH103 (wireless base station 3
0-3) to prepare for transition to a state in which transmission and reception are possible. Each radio base #30-1.30-2.30-3 that received the uplink control channel from the mobile radio 50 inspects the quality of the received signal, confirms the ID of the mobile radio 50 that transmitted the signal, and 8623, 3624>, an incoming call response signal is sent to the barrier switch 20 (3625, 5626).

This incoming call response signal to the barrier exchange 1420 also includes a signal to the switch group 23 for setting a communication path. When this incoming call response signal is received, the barrier switch 20 reconfirms whether the ID of the mobile radio 50 is already stored in the ID identification storage section 24. Normally, it is stored, but in case , if it is not stored, the wireless base station 3
0-1゜30-2. It is registered in the ID identification storage section 24 together with the quality inspection data of 30-3, and a response confirmation signal including the stored ID etc. is sent to the wireless base station 30-1゜30-2.
30-3 (3628).

Radio base station 30-1゜30- that received this response confirmation signal
In 2.30-3, confirm that the ID of the mobile radio 50 is correctly registered (5629, 5630), check whether the channel specified by the mobile radio 50 is free, and send a switching confirmation signal. Send to mobile radio device 50 via multiple or one downlink control channel (S631, 3632
>.

A switching confirmation signal to this designated channel was received (363
3) Since there are no free channels in the mobile radio device 50,
If switching of the specified channel is not allowed, select (3)
634 NO), the process returns to step 5622 and specifies another communication channel (3622). If the specified channels, for example, CHlol, CH102, CH103, are vacant channels and switching is approved (S634Y
ES), switches to that channel and sends a channel switching completion report using the uplink control channel (S635,
Figure 12E).

After confirming that the wireless base station 30-1.30-2.30-3 has been switched to an empty channel, it switches to this channel and sends a channel switching completion signal to the barrier exchange 8N20 (3636.3637). .

When the barrier switch 20 receives the channel switching completion signal, it operates the call path control unit 21 and switches the switch group 23 in order to set up a call path to the telephone network 10 via the switch 11.
Turn on 5W1-1.3WI-2゜3WI-3,
Radio base station 30-1゜30-2.30-3 and telephone network 10
(5638). Therefore, a calling signal is sent from the telephone network 10 side via the barrier switch 20 (3639
), this is confirmed at the wireless base station 30-1.30-2.30-3 (S640, 3641>.Then, the calling bell signal is set to the communication channel CH10 for high-speed movement mode.
1, Send on CH102, CH103 3642.36
43>, the mobile radio 50 generates a ringing tone (S644)
).

When the handset on the mobile radio 1150 side is picked up (off-hook) due to this ringing tone (S645, FIG. 12F), an off-hook signal is transmitted on channels CH101, CH102, CH103, and the radio base station 30-1. 30
Transferred at -2.30-3 (3646, 5647),
It is received by the barrier switch 20 (3648), and the telephone network 10
A call is started between the mobile radio device 50 (3649
).

When the call ends, the handset is put down and the on-hook signal and end-of-call signal are sent to channels CH1Q1°CH102,C.
'HIO3 allows wireless base other station 30-1.30-2.3
The wireless base station 30-1, 30-2, 30-3, which has confirmed the end of the call, transfers this signal (3651, 3652). Upon receiving this on-hook signal and call clearing signal, the barrier switch 20 operates the call path control section 21 and switches the switches 5WI-1 and 5W of the switch group 23.
1-2, 5WI-3 is turned on to end the call (S653).

(Figure 1B) Each synthesizer 55-1.55-25
and 56-1.56-2.56-3 and selector switch 64
-1.64-2 and the reception and transmission switching controllers 65C and 67C are operated, and the data is registered in the storage unit 24.
58), a response confirmation signal including the stored ID etc. is sent to the wireless base station 30-1.30-2.30-3 etc. (S659).

In the above description, radio base stations 30-1, 30-2.
Even in a system in which the control transceiver installed in 30-3 is diverted to a communication channel, a third mobile radio is It is possible to communicate with a newly incoming mobile radio using the control channel even when the mobile radio is in communication with another mobile radio (see FIG. 1D).

It should be noted that the mobile radio device 50 (B) is activated during communication due to the outgoing and incoming calls described in sections (B) and (C) above.

C, D) may change from high-speed movement mode to low-speed movement mode. As a countermeasure in this case, it is possible to adopt either a method of maintaining the high-speed movement mode only for the call, or a method of detecting the speed and shifting to the low-speed movement mode.

In the former case, no particular explanation will be given as a system technique; however, in the case of a single user, a technique for switching channels during a call, which will be explained below, will be used.

(D> Channel switching during a call The switching operation for the mobile radio t150 (B, C, D) during a call in the high-speed movement mode is similar to the channel switching during a call in the low-speed movement mode described above. Mobile radio device 50 (B.

It is assumed that when the call is started prior to the channel switching during the call performed by C, D>, the moving speed of the car is low and the call is successfully made in the low-speed moving mode. However, if the moving speed of the car subsequently increases during the call, the following technical difficulties occur. In other words, since one of the multiple channels used for communication has deteriorated in communication quality, the use of this channel is discontinued and a new communication channel is used for the new wireless base station 30 (
B.C.

In the middle of the operation of starting communication with D and E), the speech quality of the old channel deteriorates below the quality determined by the system. Or a new wireless base station 30 (B, C,
Setting up a new channel between D and E) fails due to high-speed movement mode.

The specific cause of the failure is that the transmission quality of digital control signals deteriorates due to the deterioration of radio wave propagation characteristics due to high-speed movement, and the surrounding wireless base stations 30 (B).

This is because the instruction to use a new channel to C) or the wireless base station 30 (B, C), or the response signal cannot be received well.

The flow of operations to solve such problems is explained in the 13th section.
This will be explained with reference to FIGS. A to 13F.

Open gate exchange V120. The radio base station included in the subzone SZ1 covered by the high-speed movement mode subsystem 1 is 30-1 (SZl), the radio base station included in the same subsystem 2 is 30-2 (SZ2), etc.・Similarly, the wireless base stations included in subsystem n are set to 3.
O-n (SZn) etc. (30-D (SZp), 30
-Q (SZQ),...2nd place is simply 30-n (SZ
n), etc.), and the switch SW1-1 of the switch group 23 included in the barrier exchange 20, at which the mobile radio device 50 starts operating.

1-2. ..., 1-(n-1> is on, and the radio base stations 30-1 (SZl), 30-2 (SZ2>).

・, 30- (n-1>(SZn-1> and mobile radio device 5
It is communicating with 0 in slow movement mode.

For this communication, channels C1-11, 0H2°-, C
H-(n-1) downlink frequency F1. F2.

"・, Fn-1 and upstream frequencies f1, f2, "" f
n-1 is used (S701, Figure 13A).

Radio base stations 30-1' (SZl) and 30-2 in communication
(SZ2), ・, 30- (n-1>(SZn-1)
A reception status report is constantly issued from the mobile radio device 50, and when deterioration in communication quality is discovered, it is immediately reported to the mobile radio m50 (S702>. In response to this, the mobile radio device 50 The quality monitoring unit 57 has discovered that the mobile radio 1150 itself has deteriorated in call quality (37
03, 5704), and monitors whether the call quality has deteriorated below level L1 (S705). If the call quality has deteriorated below level L1 (S705YE
S) When the mobile radio device 50 searched for the ID of the subzone with which it had communicated so far, it was found to be SZl, 2°, . . . , n-1. Also, based on the speed of the mobile radio device 50 itself, it is determined that the next subzone to communicate with is SZn, and S
Using the control channel belonging to Zn, a request is made to monitor reception of fl addressed to radio base station 3O-n (SZn) belonging to SZn (3706, FIG. 13B).

Each surrounding wireless base station 3O-(
n-1>(SZn-1> etc., the signal of frequency f1 should be monitored and received 5707), and the result is sent to the mobile radio device 50.
Please report to the Communication Quality Monitoring Department 57 (5708.3709)
, each wireless base station 3O-(n-1>(SZn-1>, etc.) Measure and compare the reception quality of the monitor 5709), inspect whether the call quality of fl is better than a certain standard level L2 (S710) ).

If the communication quality is not good (371ONO>, the control unit 58 determines that the mobile radio 11450 itself is in the high-speed movement mode, and uses a control signal format suitable for the high-speed movement mode to monitor reception using multiple signals with good radio wave propagation characteristics. <3711, which instructs the radio base station 30-n (SZn), etc., using one or one high-speed movement mode control channel (CH).
Figure 13C).

Wireless base station 30 (B, C) of a system that uses a control channel different from the control channel in use in an adjacent zone
, D, and E), methods such as increasing the number of transmitters transmitting on the same channel or having a plurality of receivers on standby in preparation for reception from the mobile radio device 50 are applied. When using the latter method of using a plurality of receivers, a plurality of receiving antennas are installed and a circuit is configured to introduce the output of each to each receiver.

Even the diversity of just the radio base stations 30 (B, C, D, E) contributes considerably to improving the reliability during transmission of control signals, so it may be sufficient for the system in some cases, but it is still insufficient. If the other. For example, increase the number of retransmissions of the same control signal.

Wireless base #30 that received the instruction in step 5711
-n (SZn) etc. <8712), monitor reception,
The results are reported to the mobile radio device 50 using diversity using a plurality of high-speed movement mode control signals or one high-speed movement mode control signal (S713).

The mobile radio device 5 that received this monitor result with diversity
0, if the communication quality is not good when receiving this monitor result, or if it cannot be received at all, (87
15NO>, the process returns to step 5711 and repeats the monitor reception instruction.

If the monitoring result is received with good communication quality (S71
5YES), by analyzing the monitoring results, the mobile radio device 50 itself moves from the zone SZ1 covered by the radio base station G130-1 (SZl) to the radio base station 30-n (SZn).
3716), and in order to switch to communication with the wireless base station 30-n (SZn), the wireless base station 30-n (SZn) selects an available free channel that can be used. Search 3717
, FIG. 13D), and as a result, a channel CHn suitable for the high-speed movement mode is determined (S718). The control unit 58 is
Transmitter 51-n and receiver 53-n of mobile radio 50
The base station 30-n is instructed to prepare for communication on the channel CHn (3719).

The communication preparation command for using this channel CHn is transmitted to the wireless base station 30 using the control channel for high-speed movement mode.
-n to prepare for communication via channel CHn (3720).

On the other hand, when the monitor signal of frequency f1 is successfully received (S710YES, FIG. 138), the mobile radio device 50
determines that it has moved into subzone SZn, searches for a communication channel that can be used in subzone SZn, and as a result, radio base station 30-2 (SZ
2) to 30(n-1>(SZn-1>) (37
21, Figure 13D). The wireless base station 30 that received this instruction
-2 (522) ~30- (n-1>(SZn-1
>, preparations are started (S722).

The mobile radio 150 prepares to enable communication using the channel cHn, that is, the control section 58 transmits the frequency F to the synthesizers 55-n and 56-n. and receive the frequency f. The switching controller 65 enters switching operation (3723, 13th "Figure").
.

When ready to communicate using channel CHn, radio base station 30-n (SZn) notifies mobile radio 150 of completion of preparation using channel CHn.
723), and at the same time wireless base station 3O-n (SZn)
sends a report to the gateway exchange 20 that preparations for communication between the radio base station 30-n (SZn) and the mobile radio 50 using the channel CHn suitable for the high-speed movement mode have been completed (3724). The mobile radio device 50 that received this
To confirm that the preparation for communication by channel CHn has been completed (3728), a communication start command is issued to the radio base station 30-n (SZn) (3729), and the radio base station 3O-n (SZn) that received this command Wait for communication (S730
).

When the gateway exchange 20 confirms the completion of communication preparation between the radio base station 30-n (SZn) and the mobile radio 50 using the channel C)-1n suitable for high-speed movement mode (
S725), switch 5W1-1.1 of switch group 23
-2. −． 1-(n-1) is left on, and the switch 5W1-n is also turned on (S726). Therefore, the communication path control unit 21 included in the barrier exchange 120 transmits the channel Cl- to the mobile radio device 50.
Report that communication can be started using I n (S7
27).

Upon receiving the communication start possibility report, the wireless base station 30-n
(SZn) sends a communication start signal to the mobile radio device 50 using channel CHn (S731>. Mobile radio device 5
0 confirms the start of communication by channel Cl-In using the ID signal which is an identification signal for identifying the radio base station 30-n (Szn> 3732), and at the same time, the communication quality monitoring unit 57 of the mobile radio device 50 , the quality level of communication between the mobile radio device 50 and the radio base station 30-n (SZn) is measured, and when it is detected that the quality level is 2 or more above a certain quality level (S733YES, FIG. 13F), the radio base station Station 3
0-1 (SZl) and the mobile radio device 50 using the channel CHI.
-1 (SZl) (3734).

As a result, the radio base station 30-1 (SZn) turns off communication using channel CI-11 (S735).

The mobile radio device 5 stops communication using this channel CI-f1.
0 is confirmed (S737), the operation of the synthesizers 55-1 and 56-1 is stopped, the changeover switch 64-1 stops switching to the output terminal of the synthesizer 55-1,
The selector switch 64-2 stops switching to the output terminal of the synthesizer 56-1 (although this operation is not necessarily required), and causes the synthesizer 56-1 to operate on channels CH2, CH3, . . . , CHn.

After confirming that channel CHI communication has stopped, the communication path control unit 21 of the gateway exchange 20 switches the switch 5W1- of the switch group 23 to
2.1-3. , 1-n remain on, and switch 5W1-1 is turned off (8736).

This ends the period of channel switching operation and switches 5W1-2.1-3. -1-n (D on state, channels CH2, CH3, ..., CHn1 downlink frequency F
2. F3. ..., Fo up frequency f2. f3. ...
, fo, the mobile radio device 50 connects to the radio base station 30-2.
(SZ2>, 30-3 (SZ3), ・, 30-n
(SZn), it is possible to continue high-quality communication without instantaneous disconnection or noise mixing, and by obtaining a transmission/reception diversity effect (8738).

Here, channels CH2 to CH(n-1) remain in low-speed movement mode, and channel CHn is used in high-speed movement mode.

Now, a description will be given of channel switching during a call when the mobile wireless device 50 is moving at high speed and continues a call. If the mobile radio device 50 at point A continues to move at high speed without changing the direction indicated by the arrow in the path shown in FIG. 14B, this time, the radio included in subsystem S2 Assume that the quality of communication with base station 30-2 (SZ2) has deteriorated. Wireless base station 30-2 facing this
(SZ2> Or, in the mobile radio device 50, the mobile radio device 50 determines that the mobile radio device 50 searches the ID Roam area information collation storage unit 54 (FIG. 1B) and determines that before moving! The target wireless base station 30 is subsystem S.
It is determined that the wireless base station (n+1) M2O-(n+1>(SZn+1)> included in the wireless base station 3O-(n+1>(SZn+1)), and the usable control channels at the wireless base station 3O-(n+1>(SZn+1) are investigated.

As a result, the high-speed movement mode control channel number is found as described above, and using this, a request is made to monitor and receive f2 addressed to nearby radio base station 3O-(n+1) (SZn+1).

At the wireless base station 30-n (SZn) etc. that received the instruction,
It monitors and receives the results, and reports the results to the mobile radio device 50 using diversity using a plurality of or one high-speed movement mode control signal.

The mobile radio device 5 that received this monitor result with diversity
0, the radio base station 3O-(
Successfully communicates with n+1>(SZn+1>).

Thereafter, when the call is continued roughly and channel switching is executed during the call using the high-speed movement mode, the IDs of the subsystems are stored in the ID roam area information collation storage unit 54 of the mobile radio 50 in the order in which the call was started. They will be stored sequentially. Therefore, even if communication is started with the wireless base station 30 in low-speed movement mode at the beginning of the call,
If you shift to high-speed movement mode and repeatedly communicate with radio base stations 30 suitable for high-speed movement mode, IDs of multiple subsystems will be stored, and the communication quality of communication with radio base stations 30 belonging to a certain subsystem will be stored. When the subsystem deteriorates, the ID of the next subsystem to communicate with can be predicted, making it possible to give monitor instructions and specify a call channel using a control channel suitable for that subsystem, making it possible to switch channels during a call efficiently and quickly. It will be possible to implement it soon.

Note that the vehicle equipped with the mobile radio device 50 is the 14th B.
A case where the user is at point B shown in the figure and turns right at the next crossroads will be explained. In this case, the subsystem ID memories of mobile radio B150 are Sl, S2, S3 . S4 and Sl at the intersection point, so even if it is as predicted, the next system to communicate with is S8 or S9, not S2.
Therefore, it becomes an ID that does not exist in memory. In this case, the mobile radio device 50 calls out to the radio base station 30-2 (SZ2>) included in S2 as S2, or if there is no response after a certain period of time, sends a call to another radio base station 30-2 (SZ2>) included in S2. It is necessary to determine that the subsystem has migrated to the subsystem and address all subsystems on a common control channel, or to address them one by one.Therefore, it takes slightly more time to switch channels. However, when making a right or left turn at an intersection, it is normal to reduce speed, and this does not cause a system failure.

The time required for such channel switching during a call is usually
The switching is completed within 1 to 3 seconds after the decision is made.

[Effects of the Invention] As is clear from the above explanation, by applying the present invention to a mobile communication system using a small zone configuration, it is possible to eliminate temporary interruptions when changing zones during a call, as in conventional systems. This problem has been completely eliminated in facsimile signals and data signals due to image quality deterioration and burst signal errors, even if the frequency of channel switching during communication increases. This will improve communication quality by adopting economical transmission and reception diversity, improve frequency efficiency by reducing interference, and make new services using wideband signals technically possible. became. In addition, it is possible to improve communication quality by effectively using wireless equipment during times of low traffic, to substantially increase the number of usable channels when traffic suddenly increases in a small zone, and to improve communication quality during times of peak traffic. In addition to being able to process location registration signals from mobile radios, by detecting the moving direction and speed of the moving object, in a system with a small zone configuration using microcells, the moving speed of the moving object can be adjusted within the zone. Even if it becomes relatively large compared to the size of
The effects of the present invention are extremely significant because it has become possible to designate communication channels effectively without causing radio interference, and it has become possible to construct an economical mobile communication system with high frequency utilization efficiency.

[Brief explanation of the drawing]

1A, 1B and 1C are system configuration diagrams showing one embodiment of the present invention; FIGS. 1D and 1E are circuit configuration diagrams showing other embodiments of the wireless base station of the present invention; Figure 1F is a circuit diagram showing one embodiment of the transmitter/receiver; Figures 1G, 1H, and 11 are circuit diagrams showing other embodiments of the mobile radio; Figures 1J and 1 are diagrams showing other embodiments of the mobile radio; FIGS. 1L and 1M are circuit configuration diagrams showing still other embodiments of the wireless base station of the present invention, and FIGS. 2(a) and (b) ) is a spectrum diagram and a circuit configuration diagram for explaining an example of the configuration of a control signal used in the present invention; FIG. 3 is a timing chart for explaining the operation of the system shown in FIGS. 18 to 1C; FIG. 4 is a flowchart showing the flow of the location registration operation of the present invention, FIGS. 5A and 5B are flowcharts showing the flow of the calling operation from a mobile radio, and FIGS. 6A, 6B, and 6C are Flowchart showing the flow of call incoming operation to a mobile radio, Figures 7A and 7B
7C, 7D, and 7E are flow charts showing the flow of channel switching operations in the system shown in FIGS. 18 to 1C, and FIG. 8 is a moving direction of the mobile radio. and an operation conceptual diagram for explaining speed detection; FIG. 9 is a system configuration conceptual diagram for explaining a conventional system example; FIGS. 10A, 10B, 10C, 10D, 10E, and FIG. 10F is a flowchart showing the flow of the location registration operation of the present invention that deals with the high-speed movement mode, and FIGS. Flowcharts illustrating the flow of the calling operation of the present invention to cope with the high-speed movement mode, FIGS. 13A, 13B, 13C, 13D, 13E, and 13F are flowcharts illustrating the flow of the channel switching operation during a call according to the present invention that deals with high-speed movement mode, Fig. 14A is a layout diagram showing the positions of radio base stations and mobile radios placed along a road to explain the operation of the system of the present invention in high-speed movement mode, and Figs. 14B and 14C are high-speed movement mode. FIG. 15 is a layout diagram showing the arrangement of subsystems arranged along the path to explain other operations of the system of the present invention in the high-speed movement mode. FIG. This is an allocation diagram. 10...Telephone network 11...Switchboard 12...
・Radio line control 1 13A-D...Radio base station 14A
-D...Zone 15...Mobile radio 16A-D
...Transmission line 19.20...Gateway switch 21...
・Call path control unit 23...Switch group 24...I
D identification storage section 29...transmission signal division section 30.30B
, 30C, 30D, 30E30-1. ~3C)-n...
・Radio base station 31.31-1 to 31-n...transmitter 3
2.32B, 32C...Radio base station control device 33.
33-1 to 33-n...receiving section 34.34C, 34-
1 to 34-n...ID identification storage units 35-1 to 35-n, 36-1 to 36-n...Synthesizer 37.37-1 to 37-n...Communication quality monitoring unit 38.
38B, 38C, 38D, 38E...control section 39.3
9C...Interface 40.400...Reference crystal oscillator 41.41-1 to 41-n...Transmission mixer 42...
Interference detectors 43.43-1 to 43-n...reception mixer 44-1.
44-2... Selector switch 45... Reception switching controller 46. 46-1 to 46-n... Radio transmitting circuit 47...
・Transmission switching controller 48.48-1 to 48-n...Radio reception circuit 49...
-Communication signal section 50.50B, 50C, 50D...mobile radio device 51.
51-1 to 51-n...transmission section 53.53-1 to 53
-n... Receiving unit 54... ID/roam area information collation storage unit 55-1 to 55-n, 56-1 to 56-n... Synthesizer 57.57-1 to 57-n... Communication quality monitoring unit 58.
588, 58C, 58D...Control unit 59...Telephone unit 61.61-1 to 61-n...Transmission mixer 62...
Interference detectors 63.63-1 to 63-n...reception mixer 64-1.
64-2.64-3...Selector switch 65C...Reception switching controller 66.66-1 to 66-n...Radio transmitter circuit 67C.
...Transmission switching controller 68.68-1 to 68-n...Radio receiving circuit 69...
-Mixing circuit 71...Reference crystal oscillator 90.90B, 90C...Transmitter/receiver 91...Digital encoding circuit 92...Multiple conversion circuits 93-1 to 93-m...Reception for communication quality monitoring Machine 94・
. . . Control transceiver 96 . . . Antenna sharing device 71 to Z16 . . . Zone.

Claims (1)

[Claims] 1. Each radio base means (30) covers a plurality of zones and constitutes a service area, and there is a mobile radio means (50) existing within the service area, and the mobile When the wireless means transmits a location registration signal containing its own identification information for registering a location, at least one communicable radio that has received this location registration signal in good condition among the wireless base means. The base means transfers the location registration signal to the barrier exchange means (20) connected to each of the radio base means through a transmission path, and the barrier exchange means to which this location registration signal is transferred receives the location registration signal. The identification information of the mobile radio means included in the registration signal and the identification information of the radio base means capable of communicating with the mobile radio means are registered, and the The registered information is sent back to the mobile radio means, and the returned registered information is stored in the mobile radio means that received the reply, and the moving speed of the mobile radio means is high. when at least one of the mobile radio means, the radio base means, and the barrier exchange means determines that transmission and reception between the mobile radio means and the radio base means cannot be performed satisfactorily because of the In addition, a high-speed movement area is set within the service area that can accommodate mobile radio means with high movement speed, and the area is set so that this high-speed movement area can be covered by at least two subsystems. The plurality of radio channels used in each of the subsystems are provided with a plurality of radio channels different from those used in other subsystems, and the high-speed movement area is provided with at least two radio channels throughout the subsystem. are redundantly covered by the radio base means included in each of the subsystems, and the barrier exchange means unifies and manages each of the radio base means included in each of the subsystems, and When the mobile radio means transmits the location registration signal, at least one communicable radio of the at least two radio base means included in the subsystem has received the location registration signal in good condition. A communication method for mobile communication in which the base means transfers the location registration signal to the barrier exchange means. 2. Includes each wireless base station (30) that covers a plurality of zones and constitutes a service area, and barrier exchange means (20) that connects each of the wireless base stations and the general telephone network (10). In a mobile communication network, mobile radio means (50
) and the radio base station, the radio base means in the process of setting up and releasing a communication path and communicating between at least one of the radio base means and the mobile radio means; In the communication method for mobile communication, which enables the communication path to be changed by updating the mobile radio means, since the moving speed of the mobile radio means is high, transmission and reception between the mobile radio means and the radio base means can be performed satisfactorily. In case at least one of the mobile radio means, the radio base means, and the barrier exchange means determines that the
A high-speed movement area capable of accommodating mobile radio means with high movement speed is set within the service area, and the high-speed movement area is configured to be covered by at least two subsystems. , a plurality of radio channels used in each of the subsystems are provided with a plurality of radio channels different from those used in other subsystems, and the high-speed movement area is provided with at least two radio channels throughout the subsystem. The radio base means included in each of the subsystems overlap and cover the radio base means, and the barrier exchange means unifies and manages each of the radio base means included in each of the subsystems. When a calling signal including self-identification information is transmitted from the mobile radio means of the subsystem, at least one of the at least two radio base means included in the subsystem that has received the calling signal in good condition; With two communicable radio base means,
Transferring the calling signal to the gateway exchange means, and transmitting to the mobile radio means identification information of the subsystem to which the radio base means belongs as well as identification of other radio base means in the movement direction of the mobile radio means. A communication method for mobile communications that allows information to be transmitted. 3. Contains each radio base means (30) that covers a plurality of zones and constitutes a service area, and barrier exchange means (20) that connects each of the radio base stations and the general telephone network (10). In a mobile communication network, mobile radio means (50
) and the radio base station, the radio base means in the process of setting up and releasing a communication path and communicating between at least one of the radio base means and the mobile radio means; In the communication method for mobile communication, which enables the communication path to be changed by updating the mobile radio means, since the moving speed of the mobile radio means is high, transmission and reception between the mobile radio means and the radio base means can be performed satisfactorily. In case at least one of the mobile radio means, the radio base means, and the barrier exchange means determines that the
A high-speed movement area that can accommodate mobile radio means with high movement speed is set within the service area, and this high-speed movement area is configured to be covered by at least two subsystems. , a plurality of radio channels used in each of the subsystems are provided with a plurality of radio channels different from those used in other subsystems, and the high-speed movement area is provided with at least two radio channels throughout the subsystem. The wireless base means included in each of the subsystems overlap and cover the wireless base means, and the barrier exchange means unifies and manages each of the wireless base means included in each subsystem, and the high-speed movement When there is an incoming call to the mobile radio means in the subsystem, at least one of the at least two said radio base means included in said subsystem is capable of communicating an incoming call signal to said mobile radio means in good condition. Transferring the incoming call signal from the barrier exchange means to one radio base means, and the radio base means receiving the transfer transmits identification information of the subsystem to which it belongs as well as other radio bases in the movement direction of the mobile radio means. A communication method for mobile communication that transmits identification information of a means.