WO1993014576A1 - Procede de communication avec des stations mobiles et systeme a cet effet - Google Patents

Procede de communication avec des stations mobiles et systeme a cet effet Download PDF

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Publication number
WO1993014576A1
WO1993014576A1 PCT/JP1988/000783 JP8800783W WO9314576A1 WO 1993014576 A1 WO1993014576 A1 WO 1993014576A1 JP 8800783 W JP8800783 W JP 8800783W WO 9314576 A1 WO9314576 A1 WO 9314576A1
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WO
WIPO (PCT)
Prior art keywords
radio
communication
wireless
receiving
mobile
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP1988/000783
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English (en)
Japanese (ja)
Inventor
Sadao Ito
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Individual
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Individual
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Application filed by Individual filed Critical Individual
Priority to US07/348,662 priority Critical patent/US5095531A/en
Anticipated expiration legal-status Critical
Publication of WO1993014576A1 publication Critical patent/WO1993014576A1/fr
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/32—Hierarchical cell structures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection

Definitions

  • the present invention relates to a communication method and system for mobile communication. Further, in mobile communication using a small zone configuration, when communication quality deteriorates due to movement of a communicating mobile terminal, a communication method that satisfies the communication quality. And about the system.
  • the conventional small-zone method is used, for example, in the car telephone method of ⁇ ⁇ (Nippon Telegraph and Telephone Corporation), which is currently in commercial service. Away from the wireless base station of the call partner station. Since the received input electric field value of the telephone decreases, the communication quality deteriorates. For this reason, in the small zone configuration, the radio base stations are installed in the service area ⁇ 0 to 12 to each other, so the above-mentioned Yugai is always near the current position of the car (within 5 to 6 / ⁇ ) There is another radio base station in this area, and the new radio base station and the mobile radio continue using another radio channel.
  • a radio network controller that controls the setting and release of radio line communication is installed to control many radio base stations and mobile radios. It is connected to a general telephone network via a gateway exchange that forms the interface.
  • the radio network controller causes a plurality of radio base stations in the vicinity of the mobile radio to receive the transmission radio wave of the mobile radio, and a specific radio base station transmits the radio wave to a specific radio base station. If it is determined that the desired communication quality can be maintained if a new radio channel is set between, the channel setting is performed between the mobile radio and the radio base station.
  • FIG. 1 shows a conceptual diagram of a configuration of a conventional system performing such an operation, which will be described with reference to FIG.
  • each zone ⁇ 4 5, ⁇ 4 ⁇ , 4C, ⁇ 40 surrounded by four circles and having a radius of about 5 to 7 to is the service area of the car phone, and is now installed in the car.
  • mobile radio ⁇ 5 is communicating with radio base station ⁇ 3A in zone ⁇ 4 ⁇ .
  • the relative distance between base station ⁇ 3A and mobile radio ⁇ 5 is increasing. Communication is ongoing and the vehicle is in Zone 14 from Zone 14 A If it moves into C, the wireless base station ⁇ 3 ⁇
  • This state of quality deterioration is constantly monitored by the radio network controller 12 and when the quality falls below a certain standard, the radio base stations 13 B and 13 C around the radio base station 13 A And requests ⁇ 3D to measure the quality of the radio channel in use (assumed to be channel CH ⁇ ) between radio base station 13A and mobile radio ⁇ 5.
  • the wireless base stations ⁇ 3 B, ⁇ 3 C, and ⁇ 3 D tune their own wireless channel search receivers (not shown) to channel CH ⁇ and receive signals. The status is reported to the radio network controller ⁇ 2.
  • each transmission line ⁇ 6 is used between the radio network controller ⁇ 2 and each radio base station ⁇ 3, and each radio base station ⁇ 3 and the mobile radio are used.
  • the line with 15 is a wireless communication channel.
  • the channel switching signal is transmitted from the base station 13A that had previously communicated to the mobile radio 15 and the radio continuity test tone is newly switched, for example.
  • the radio base station ⁇ 3 C sends it to the mobile radio ⁇ 5.
  • a control signal (in this case, a 300-bit digital signal) for switching according to the above ⁇ ) is input to the active channel after the other party's signal is cut off. Since it appears in the output of the receiver, it is mixed in the call as an audible sound of about 300 Hz, and the call is interrupted during this time.
  • the radio network controller ⁇ 2 instructs the radio base station ⁇ 3C to start a call using the mobile radio ⁇ 5 and, for example, channel CH10 via the transmission path ⁇ 6C between them. I do.
  • This instruction can also be From this moment, the wireless base station ⁇ 3A ends communication with the mobile wireless device ⁇ 5, and the wireless base station 13C communicates with the mobile wireless device ⁇ 5 instead.
  • the radio network controller ⁇ 2 has a gateway exchange ⁇ 9 for connecting each radio base station 13 with the telephone network ⁇ 0, while a gateway exchange ⁇ 9 which interfaces with the telephone network ⁇ 0.
  • the request is to switch the communication path switch SW of the wireless base station from ⁇ 3A to ⁇ 3C.
  • the A-4 switch is turned off (displayed with a plank triangle) and the C-14 switch is turned on (displayed with a black triangle) using the communication path switch SW shown in FIG.
  • any telephone in the telephone network ⁇ 0 and the car move to any of the zones ⁇ 4A, ⁇ 4 ⁇ , 14C, 14D Even then, the call will be continued.
  • radio wave propagation characteristics are greatly affected (propagation loss) by the influence of the terrain and structures in one small zone. As they become smaller (radius ⁇ ⁇ or less), they become relatively large, and use relatively high-level transmitters for radio base stations and mobile radios, and use terrain and structures. Good communication will be ensured even in the affected areas, and where there is no terrain or construction Means that distant radio base stations can communicate with mobile radios in other zones.
  • the call disconnection caused by the transfer between zones during a call was considered to be a type of communication quality problem, and a solution was needed from the viewpoint of quality assurance.
  • Traffic fluctuations in communication within the system are usually very low at midnight or early morning, and during the daytime. Large traffic peaks can be seen around midnight and 2-3 pm, and on mobile phones at 5-6 in the evening, but if the system design is designed to function satisfactorily even during maximum traffic, However, when the system is off, the system components become idle, which increases the cost.If a system is adapted during off hours, the cost is extremely low, but it becomes unavailable during the busy hours and the serviceability decreases. It wasn't be helped.
  • the location registration of a mobile unit that communicates is performed by registering and processing only the data received by one radio base station at a time around the circumference.
  • registrations are changed frequently at a considerable frequency, or in systems where the location registration method is restricted due to the effective use of frequency, calls to mobiles may not be possible due to inadequate location registration.
  • the wireless transceiver installed in the wireless base station is In the case of only a channel, it must be used in a time-sharing manner for control and communication, and when a location registration request is received from another mobile radio in the same zone while communicating with the mobile radio. There were significant adverse effects.
  • the call is temporarily disconnected (0.7 to 0.8 seconds) when the wireless channel is switched, and the call signal other than the call signal is cut off.
  • a part of the control signal 300 bits Z seconds
  • the sound is harsh. listen This can be compensated for by performing corrections, etc., so it does not cause a major obstacle.
  • One-minute facsimile had the drawback that the black part (or white line) appeared on the paper as a black line (or white line), greatly deteriorating the received image quality.
  • a data signal of 1200 baud would lose about 1000 bits of signal, so a procedure such as retransmission was required.
  • An object of the present invention is to provide a system in which a plurality of wireless base stations and a mobile wireless device communicate with one another in parallel using a plurality of channels.
  • Another object of the present invention is to provide a case in which a channel (old channel) in which the communication quality has fallen below a certain value occurs while communicating the same communication contents in parallel using a plurality of channels. Under the control of the radio system controller, communication with the old channel is terminated by switching to another channel (new channel) that satisfies a certain level of communication quality, and the same channel is used using multiple channels including the new channel. It is an object of the present invention to provide a system that allows communication of the communication contents without interruption.
  • Still another object of the present invention is to provide a mobile radio unit in an ID identification storage unit provided in each radio base station and radio system controller. This is to improve the reliability of location registration by registering the locations in parallel based on the data of each radio base station.
  • Still another object of the present invention is to realize instantaneous interruption of switching between channels during a call (communication) between zones or within a zone by switching a channel having deteriorated communication quality among a plurality of channels to a new channel. It is in.
  • Still another object of the present invention is to provide a system which can ensure good communication quality by adopting economical transmission / reception diversity, that is, reduce interference interference, and enable a service using a wideband signal. .
  • Still another object of the present invention is to provide a system that can effectively utilize wireless equipment and achieve high communication quality by performing parallel communication using many channels when traffic is idle. It is in.
  • Still another object of the present invention is to provide an ID identification storage unit and a function for enabling simultaneous transmission and reception of a plurality of wireless channels by high-speed switching in each wireless base station, thereby enabling mobile stations to move even during the most busy time of traffic.
  • An object of the present invention is to provide a system capable of processing a position registration signal from a wireless device.
  • Still another object of the present invention is to improve the transmission characteristics of a wideband signal by performing parallel communication of a plurality of channels, thereby obtaining an improvement in line quality.
  • Still another object of the present invention is to secure the communication in the destination zone and to perform the prior allocation of the channel used in the expected destination zone by estimating the moving direction and speed of the mobile radio.
  • a plurality of wireless base stations including a wireless transceiver and an ID identification storage unit, a group of switches connecting a plurality of wireless base stations and a telephone network via a gateway exchange, and the group of switches are controlled.
  • a radio system controller including a communication control unit, an ID identification storage unit, and an SZN monitoring unit for monitoring a signal-to-noise ratio received by each radio base station, and a service covered by the plurality of radio base stations ⁇
  • a mobile radio that includes a radio reception circuit that receives multiple channels at the same time and a radio transmission circuit that transmits multiple channels simultaneously in order to communicate with multiple radio base stations simultaneously while moving within the area.
  • a system including.
  • Figure 1 is a conceptual diagram of the system configuration for explaining a conventional system example.
  • FIG. 2A, FIG. 2B and FIG. 2C are configuration diagrams showing one embodiment of the present invention.
  • 2D and 2E are circuit diagrams showing another embodiment of the radio base station according to the present invention.
  • FIG. 2F is a circuit configuration diagram showing one embodiment of the transceiver
  • FIGS. 2G, 2H and 2I are circuit configuration diagrams showing another embodiment of the mobile radio
  • Fig. 3 (a) and (b) are a spectrum diagram and a circuit configuration diagram for explaining a configuration example of a control signal used in the present invention
  • Figs. 4A and 4B are position registration operations of the present invention, respectively.
  • FIGS. 6A, 6B and 6C are flow charts showing the flow of an incoming call to a mobile radio.
  • FIG. 7 is a timing chart for explaining the operation of the system shown in FIGS. 2A to 2C.
  • FIGS. 8A, 8B, 8C, and 8D are flow charts showing the flow of channel switching operation of the system shown in FIGS. 2A to 2C.
  • FIG. 9 is an operation concept diagram for explaining the traveling direction and speed detection of the mobile wireless device.
  • 2A, 2B, and 2 B show an example of a system configuration for explaining an embodiment of the present invention.
  • reference numeral 10 denotes a general telephone network, which includes an exchange for general telephones.
  • Reference numeral 19 denotes a gateway exchange for exchange-connecting an ordinary telephone exchange included in the telephone network # 0 with a wireless system.
  • Reference numeral 20 denotes a radio system controller, which is capable of communicating with a plurality of radio base stations 30— ⁇ , 30-2, ⁇ “, 30—n and many mobile radios and telephones accommodated in a general telephone network 0. It connects and transmits and receives control signals between the wireless base stations 30- ⁇ to 30- ⁇ , and communicates with the mobile base stations 30-1 to 30-n and mobile radios.
  • the SZN monitoring unit 22 for monitoring the signal-to-sound ratio in the network, the communication control unit 2 for controlling the release of the setting of the communication channel, and the like, and each of the radio base stations 30-
  • a switch group 23 necessary for switching the communication path to make a connection between 30-n and the gateway exchange # 9 is included in the switch group 23. Switches SW1-1 to SW # 1 n, SW2—one to SW2— n, SW3— 1 to SW3— n is included.
  • transmitting section 3— to 31— ⁇ , receiving section 33_ 33—33—n, ID identification storage section 34— ⁇ —34—n, control section 38—1— 38—n is included.
  • FIG. 2B shows a mobile radio device 50 communicating with each of the radio base stations 30-— to 30-n.
  • the received signal received by the antenna unit enters a wireless reception circuit 68 including a reception mixer 63 and a reception unit 53, and a communication signal output from the reception unit is input to a control unit 58 and a telephone unit 59.
  • the communication signal output from the telephone unit 59 is applied to a radio transmission circuit 66 including a transmission mixer 6 ⁇ and a transmission unit 5 ⁇ , and the transmission signal is transmitted from the antenna unit and received by the radio base station 30. .
  • An ID ⁇ ROHM ⁇ area information collation storage unit 54 for storing and identifying the zone in which 1D is stored and in which zone the user is located is provided with connections as shown in the figure.
  • the mobile wireless device 50 further includes synthesizers 55_ ⁇ , 55-2,..., 55-n and 56-1, 56-2,..., 56—n, and switching switches 64-1, 64. -2 and the switching switches 64-1 and 64-2 include a reception switching controller 65 C and a transmission switching controller 67 C that generate signals for controlling the switching, respectively. 55— ⁇ to 55—11 and 56—1 to 56—1, and both switching controllers 65C and 67C are controlled by the control unit 58. Each synthesizer 55— ⁇ to 55—n and 56—1 to 56 1n is supplied with a reference frequency from a reference crystal oscillator 7 ⁇ .
  • FIG. 2C shows a radio base station 30 (for example, 30- ⁇ ) that communicates with the mobile radio 50, which is substantially similar to the configuration of the mobile radio 50 shown in FIG. 2 ⁇ .
  • the ID identification storage unit 34 for identifying and storing the ID number of the self and the called party, It has a communication quality monitoring unit 37 that constantly monitors the quality and reports it to the control unit 38 when it deteriorates.
  • Radio transmitter 46 (66) Wireless receiving circuit 48 (68)
  • FIG. 2D shows another embodiment 30B of the radio base station 30 (for example, 30- ⁇ ) communicating with the mobile radio 50, and the mobile radio shown in FIG. 2B is shown.
  • the structure is almost the same as that of the 50, except that the ID * ROHM area information Verification record part 54 (Fig. 2B) does not exist, and the ID is used to identify and memorize the own and called party's I number.
  • It has an identification storage unit 34 and a communication quality monitoring unit 37 that constantly monitors the quality of communication during communication and reports any deterioration to the control unit 38.
  • FIG. 2E shows another embodiment of the radio base station 30 in which a radio base station 30 C including a plurality of transceivers connects an antenna sharing device 96 and a radio base station controller 32.
  • a number of shared transceivers 90-1-1 to 90-111, and m m units having both functions of the wireless reception circuit 48 and the communication quality monitoring unit 37 shown in FIG. 2D A communication quality monitoring receiver 93- ⁇ to 93-m and a control transceiver 94 dedicated to a control channel for control signals are shown, and are transmitted via a radio system controller 20 and a gateway exchange 19. Connected to telephone network ⁇ 0.
  • the configuration of the transceivers 90] of the transceivers 90— ⁇ to 90—m used in FIG. 2E is shown in FIG. 1F and is included in the radio base station controller 32.
  • the connection relationship between the ID identification storage unit 34 C, the control unit 38 C, and the reference crystal oscillator 40 C is shown.
  • the transceiver 90 shown in FIG. 2F has almost the same configuration as the radio base station 3 OB shown in FIG. D, and many transceivers 90 store 10 identification memories. Section 34 ⁇ , control section 38C and reference crystal oscillator 40C are shared.
  • the synthesizers 3 5— ⁇ to 3 are provided by the switching switches 44— ⁇ and 441-2. If a particular synthesizer is selected from among 5—n and 36—to 36—n, the radio base station 30 G shown in FIG. Can be transmitted and received at the same time.
  • the synthesizers 35- ⁇ -35-n and 36- ⁇ -36-n are chopped at high speed.
  • ⁇ ⁇ transceivers 90 can simultaneously use n channels Can be sent and received. Therefore, the radio base station 30C in FIG. 2E can simultaneously transmit and receive mxn channels at the maximum.
  • FIG. 2 (FIG. 3 shows another embodiment of the mobile radio device 50).
  • the difference between the mobile radio 5 OB shown in FIG. 2G and the mobile radio 50 shown in FIG. 2B is that, in addition to the radio mixer 68 including the reception mixer 63 and the reception unit 53, the reception mixers 73 and C A receiver 52 for N measurement is provided, and the two mixers 63 and 73 are provided with a synthesizer via switching switches 64-1 and 64-3 controlled by a reception switching controller 65C and a controller 58B, respectively.
  • An output of 55- ⁇ to 55_ ⁇ is applied, and a synthesizer 56- ⁇ to 56- ⁇ is applied to the transmission mixer 6 ⁇ via a switching switch 64-2 controlled by a transmission switching controller 67 ⁇ . Is applied.
  • the mobile wireless device 5 shown in FIG. 2G has a function having a particularly remarkable reception diversity effect.
  • a part of the reception signal received by the antenna unit of the mobile radio device 50 is added to the reception mixer 73.
  • Outputs from the synthesizers 55- ⁇ to 55- ⁇ are added as local oscillation frequencies to the reception mixer 73 via the switching switch 64-3.
  • This switching switch 64-3 does not need to be switched at high speed like the other switching switches 64-— and 641-2, and a low switching speed of, for example, about 0 Hz is sufficient.
  • switch 64-3 is positioned to obtain the output of synthesizer 55- ⁇ , the CZN value of channel CH ⁇ (the value of the carrier-to-sound ratio) measured by CZN measurement receiver 52 is transmitted to controller 58B.
  • the switch 64-3 is used for the synthesizer 55.
  • the output of step 2 is at the position where the output is crossed, measure the channel N value of channel CH2.
  • the QZN value of CH n is measured and transmitted to 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, for example, to operate at speeds inversely proportional to the respective values.
  • FIG. 2H shows a configuration example of the mobile wireless device 5 OC in this case.
  • the input radio wave (input signal) to mobile radio 50C is divided into n equal parts at the antenna input part, and arrives at radio receiving circuits 68- 68, 68-2, ..., 68-n, respectively.
  • Each of the wireless receiving circuits 68— ⁇ to 68—n includes a receiving mixer 63— ⁇ , 63—2,..., 63—n, and receiving units 53-1 to 53—2,.
  • the local oscillation frequencies from the synthesizers 55-55-2, ⁇ , 55-n are input to the reception mixers 63-1 to 63-n, respectively.
  • reception switch 64-1 there is no reception switch 64-1, as shown in Fig. 2B, etc., and it is possible to always receive and demodulate the signals of each wireless channel CH1, CH2, ..., CHn. It is.
  • a part of the output signals of these receiving units 53-1 to 53-n is sent to the control unit 58C, and another part is added to the mixing circuit 69 to be used in a normal diversity receiver (in this case, detection). Post-synthesis) and other processing are performed, and sent to the telephone unit 59.
  • FIG. 2I shows the mobile radio 50 C shown in FIG. 2H.
  • a different mobile wireless device 500 is shown, and the difference is that a wireless transmission circuit 66— ⁇ —66—n including n transmission mixers 61— ⁇ to 61—n, a transmission unit 5—— ⁇ to 51— ⁇ . ⁇ , and a signal to be transmitted is commonly connected and applied to each of the transmitters 51- ⁇ to 5 ⁇ - ⁇ , and is controlled by the control unit 58 D to generate the designated frequency.
  • Outputs from the synthesizers 56- ⁇ to 56- ⁇ are applied to the respective transmission mixers 61- ⁇ to 6 ⁇ - ⁇ .
  • the mobile radio device 50D can continuously transmit a plurality of radio channels without chopping by the switch 64-2 as shown in the mobile radio device 50C (FIG. 2).
  • the control signals between the mobile radio device 50 ( ⁇ , C, D), the radio base station 30 ( ⁇ , C), and the radio system controller 20 are different from those in the case where a control channel dedicated to the control signal is used. Talk) In some cases, the out-of-band signal is used.
  • the wave number of the control frequency T D () ⁇ f D8 may also be further increased, it is also possible to take the subcarrier format. At this time, For example, more control data can be transmitted by frequency-modulating or amplitude-modulating the ⁇ wave or multiple waves from f D () to “r D8 ”. .
  • FIG. 3 (b) shows a case where the audio signal is digitized by the digital encoding circuit 9 ⁇ , the data signal and the data signal are multiplex-converted by the multiplex conversion circuit 92, and applied to the modulation circuit of the transmission unit 3 ⁇ . This is an example.
  • the functions of the mobile radio device 50 (B, C, D), the radio base station 30 (B, C), and the radio system controller 20 will be sequentially described.
  • the control unit 58 (B, C, D) first has the following functions as basic functions.
  • the radio transmission circuit 66 of the own mobile radio device 50 (B, C, D) is instructed to start or stop transmitting radio waves and to control the transmission power level.
  • the radio channel used by other mobile radios or other radio base stations operating around the own mobile radio 50 (B, C, D) is identified by the ID / ROHM area information collation storage unit 54. And use it when calling or switching communication channels.
  • Devices having the following functions are set in the wireless base station 30.
  • Each radio base station has a dedicated radio transceiver for transmitting and receiving a small number (usually ⁇ ) of control channels, and a dedicated communication channel for the number of communication channels assigned to the radio base station.
  • a small number usually ⁇
  • the number of communication channels to be allocated to one wireless base station 30 C is assumed by the base station.
  • the optimum value is given by the call traffic of the mobile radio 50 (B, C) existing in the small zone, which is inevitable for a large zone and a large number of mobile radios in the area. Therefore, at least one control channel and a plurality of communication channels are required, and a plurality of transceivers 90 (Fig. 2F) are naturally required. Big city with telephone system In some cases, two control channels and a maximum of about 60 communication channels are allocated.
  • a mobile radio device that desires a new incoming / outgoing call by repeatedly switching between a communication channel and a control channel at a switching speed that does not disturb the transmitted / received radio frequency.
  • the feature of the present invention is that it has an excellent function of accepting outgoing / incoming calls for (B, C, D) and enabling a call.
  • each pair of transmitting and receiving units 3 3 and 32 is shown, and the rest is omitted.
  • the transceiver dedicated to the communication channel installed in each radio base station 30 uses ⁇ channel among a plurality of radio channels in the radio channels assigned to that radio base station. Of course, it is possible to receive signals. However, in zones where traffic fluctuations are severe, ⁇ transceivers 90 installed in the radio base station 30C (Fig. 2E) are connected to the radio base station 30 in Fig. 2F. It is assumed that the configuration is as shown in FIG. That is, the configuration of the portion for transmitting and receiving radio signals is substantially the same as that of the mobile radio 50 shown in FIG. 2B.
  • the call traffic in this zone increases and the number of Even if m radio base stations 30C are installed, if communication over m channels becomes necessary due to an increase in call traffic, one transceiver 90 constituting the radio base station 30C is required.
  • the currently operating synthesizers 35- ⁇ , 36-—, 35-2, 35 -3,..., 35-n and 36-2, 36 -3,, ' ⁇ , 36-n and the switch 44-—, 44-12 are operated. This allows transmission and reception of up to mxn channels instead of the conventional transmission and reception of m channels. The number of channels that can talk simultaneously increases dramatically
  • the transmission power of each channel decreases according to the number of switching unless a power amplifier is inserted in the output of the transmission mixer 6 ⁇ , so it is necessary to pay attention to this point and the total power given to the system
  • the number of channels becomes the upper limit. Or, if it interferes with a channel that is communicating in another zone, the number of channels less than that will be the limit.
  • the signal band must be limited so that the communication signals do not overlap between channels in the baseband frequency band.
  • one mobile radio 50 ( (B, C, D) and the communication channel the switching between the communication channel and the control channel repeatedly at a switching speed that does not disturb the radio frequency transmitted and received as described above.
  • the mobile radio 50 (B, C, D) that wants a new call can accept the incoming and outgoing call, and the mobile radio with a different priority has the same Calls can be made possible by assigning a channel to a mobile radio that wants to make a new call.
  • radio base station 30 will be further described with reference to FIG. 2F, but the functions of the radio base stations 30 and 30B in FIGS. 2 ⁇ and 2D are almost the same.
  • the control unit 38C first has the following functions as basic functions.
  • Receiver for monitoring communication quality 93_1 to 93-m judge the appropriateness of change of the channel to be used based on the information, and whether or not to transmit the quality information to the opposing mobile radio 50 (B, C, D) Judgment.
  • xi) In terms of control decisions, it must be higher than the mobile radio 50 (B, C, D), but lower than the radio system controller 20. In this case, when the mobile radio 50 (B, C, D) is different from the mobile radio 50 (B, C, D), the initiative can be exercised for the mobile radio 50 (B, C, D). Is to transfer the initiative.
  • xi) is defined for convenience of explanation, and in an actual system, even if the wireless base station 30C or the mobile wireless device 50 (B, C, D) takes the initiative in the first place, It can be implemented without any problem.
  • a radio that doubles as a communication channel and a control channel similar to the mobile radio 50 (B, ⁇ , D) explained in (A), As shown in Fig. 2D, it has a plurality of synthesizers 35- ⁇ to 35- ⁇ , 36- ⁇ to 36-n, and switches the transmission and reception radio frequency to the communication channel at a switching speed that does not disturb the signal.
  • a function shall be provided that accepts outgoing / incoming calls for mobile radios 50 (B, C, D) that desire a new outgoing / incoming call by repeatedly switching the control channel, and enables a call.
  • control function associated with shifting to another zone is as follows:
  • the ID and the call channel number of the mobile radio 50 (B, C, D) with which communication has been performed are stored for a certain period of time.
  • the ID (self-identification information) of D> is stored in the ID identification storage unit 24 via the communication path control unit 2 # included in the radio network controller 20.
  • the received signal quality By detecting the moving direction and speed of the best radio base station and the next best radio base station 30 (B, C) or mobile radio 50 (B, C, D), a new zone in anticipation of the destination zone Radio base station 30 (B, ⁇ ), which is used for communication with the mobile radio 50 (B, C, D) from among the radio channels assigned to that radio base station.
  • the communication channel number that should be used at that time should be reported to the radio network controller 20.
  • the radio system controller 20 includes a mobile radio 50 (B, C, D) radio base station 30 (B, C) radio system controller 20 a gateway exchange ⁇ 9 telephone network ⁇ 0 (Telephone subscriber) Set and release a call (communication) route with the (phone subscriber), change the location registration when the mobile radio moves between zones, and perform functions such as switching channels during a call (communication). More specifically, the radio system controller 20 has various functions as shown in Fig. 2A, which will be described below.
  • the ID of the radio base station 30 (B, C) and the radio base station 30 (B, C) are stored in the ID identification storage unit 24 via the communication control unit 2 ⁇ .
  • the quality (decibel value of SZN, CZN, etc.) is also stored.
  • the radio base station with the best received signal quality Station 30 (B, C) or the next best radio base station 30 (B, C) is selected, and the mobile radio 50 (B, C) is selected from the radio channel assigned to that radio base station.
  • D) to specify a communication channel number that is not in use at that time, and to other radio base stations, a command signal to stop communication with the mobile radio 50 (B, C, D) Is sent.
  • this paging signal is sent to all the radio base stations 30 (B, C) in which the current location of the mobile radio 50 (B, C, D) is registered, and each radio base station receiving this is called out.
  • an incoming call signal for mobile radio device 50 (B, C, D) using the downlink control channel is transmitted at the peripheral time, but the transmission time is not necessarily the same.
  • the signal may be transmitted sequentially in time series for each of the radio base stations 30 (B, C), that is, it is only necessary to take measures to prevent interference due to a time difference between signals.
  • the mobile radio device 50 (B, C, D) that is communicating can be placed in the surrounding zone as the location moves, or the zone can be shifted to the radio base station 30 (B, C, D).
  • C) an instruction to perform an operation of channel switching during communication (talk) for the channel when the communication quality with the base station 30 (B, ⁇ ) It is necessary to send a control signal to this instruction (control signal)
  • the communication is performed using the speech channel and using the upper or lower frequency band of the speech signal frequency band.
  • the mobile radio 50 ( ⁇ , C, D) measures the reception quality change of each of the radio base stations 30 ( ⁇ , C) communicating with each other, Estimate the moving direction and moving speed of 50 ( ⁇ , C ', D), and determine the traffic condition (radio point of the communication channel) in the radio base station 30 ( ⁇ , C) in the moving direction of the mobile radio ((, C, D).
  • the usage status is comprehensively determined, and if necessary, the multiplicity of the transmit / receive diversity of the mobile radio 50 ( ⁇ , C, D) communicating with these radio base stations 30 ( ⁇ , ⁇ ) can be reduced or reduced. Give instructions to increase.
  • Station 30 ⁇ to 30— ⁇ operates When the mobile wireless device 50 (B, C, D) is turned on and the operation starts, the location registration operation is performed first. The flow of this location registration operation is shown and described in FIGS. 4A and 4B.
  • a signal to start the operation for registering the current position is transmitted to the nearby radio base station using the uplink control channel (CH). For example, it is sent for 30- ⁇ to 30-n (S20 ⁇ , Fig. 4A).
  • the radio base station 30 Upon receiving the operation start signal from the mobile radio 50 (B, C, D) (S202), the radio base station 30 confirms the start of operation of the mobile radio 50 (B, C, D) (S202). 203), if it is confirmed (S203 YES), if the downlink control channel is in the effective state, it is turned on and the location registration signal is turned on.
  • the mobile radio device 50 Upon receiving the position registration signal transmission permission (S205), the mobile radio device 50 (B, C, D) transmits its position registration signal using its own ID (identification number) using the uplink control channel.
  • the radio base station 30 (B, Q) checks the reception quality and stores the ID in the ID identification storage unit 34 (S208). Done If the result is equal to or more than the predetermined value (S209 YES, FIG. 4B), a position registration request signal is transmitted to the radio network controller 20 (S210). S 21 1) The radio network controller 20 registers that the reception quality and the location are stored in the plurality of radio base stations 30 - ⁇ to 30-n (S 21 2). Then, a registration completion signal is transmitted (S213) . The radio base station 30 (B, C) receiving the registration completion signal transmits the registration completion signal to the mobile radio device 50 (B, C, D) using the downlink control channel. Forward.
  • the position registration operation is completed and the apparatus enters a standby state for an incoming call.
  • the registration of the mobile radio device 50 (B, C, D) in the mobile communication system according to the present invention differs from the conventional system in a plurality of locations (wireless base station units). ). This represents one feature of the present invention.
  • the radio base station 30 (B, C) and the radio system controller 20 store the location registration information when the location registration signal transmitted from the mobile radio .50 (B, C, D) is stored. Therefore, for example, the radio system controller 20 stores the position registration signal of the mobile radio device 50 (B, C, D) in order to store the position registration signal of the mobile radio device 50 (B, C, D).
  • the reception quality is stored in the order of decreasing reception quality as shown below. 1
  • Radio base station Mobile radio time
  • each radio base station stores not only the information received by the radio base station 30 (B, C) but also the reception information of the surrounding radio base stations as shown in Table III. This means that when a communication path is set up with the mobile radio 50 (B, C, D), the call (communication) during the communication of the mobile radio 50 (B, C, D) is switched. This is not only useful information but also necessary for estimating the moving direction, speed, etc. of the mobile radio 50 (B, C, D).
  • the ID report in the mobile radio 50 (B, C, D) ⁇ Area information matching storage unit 54 also stores the S report as in Table II.
  • the mobile radio device 50 (B, C, D) moves from the zone in which the location has been registered during standby (when no call is made) and shifts to an adjacent zone.
  • the ID of the wireless base station 30 (B, C) included in the received control signal is assigned to the mobile radio 50 (B, C).
  • C, D) can be determined by collating with the ID stored.
  • the mobile radio station 50 (B, C, D) transmits the control signal from the surrounding radio base station 30 (B, C) at predetermined time intervals. , C) using the uplink control channel to send a downlink control signal, and in response to this, the ID of the radio base station 30 (B, C) transmitted from each radio base station 30 (B, C) is determined. This is enabled by collating with the ID information stored in the mobile radio 50 (B, C, D).
  • the base station ID information previously stored in the mobile radio 50 (B, C, D) of the ID information of the radio base station 30 (B, C) obtained as a result is obtained. If it is found that there is at least at least one new base station ID information different from the base station ID, the mobile radio device 50 (B, C, D) determines that the mobile station has shifted to the new zone, and the control unit 58 (B, C) updates the location registration in the ID roam ⁇ area information collation storage unit 54. That is, the ID information of mobile radio device 50 (B, C, D) is transmitted to neighboring radio base station 30 (B, ⁇ ) using the uplink control channel.
  • the plurality of radio base stations 30 (B, C) that have received this signal satisfactorily perform the same procedures as described above, and send the radio controller 20 to the mobile radio 50 (B, C, D). Sends the position registration signal.
  • the radio system controller 20 operates the ID identification storage unit 2 in the device, and uses the conventional information as the location registration information of the mobile radio 50 (B, C, D). Then, let them rewrite to new information. As a result, the location registration of the mobile radio device 50 (B, C, D) is updated.
  • the above update work is necessary because the mobile radio 50 (B, C, D) is in standby mode. If the mobile radio 50 (B, C, D) moves to a new zone during communication (talk), the new call will be made as described later.
  • the channel assignment is performed between the new radio base station (B, C) and the mobile radio 50 (B, C, D)
  • the location registration to the radio system controller 20 is updated at the same time. No action is required.
  • the radio base station 30 (B, C) is not used.
  • the mobile radio 50 (B, C, D) of another mobile radio there is no other radio in standby using the conventional technology, so even if another mobile radio sends a location registration request. However, the call was invalid.
  • a configuration of the mobile radio for example, a plurality of synthesizers 55-1 to 55-n, 56- ⁇ to 56-n and switching switches 64-—, 64-2 as shown in FIG. 2B are provided. With this method, it is possible to communicate with a newly-arrived mobile radio using the control channel, even if the mobile phone is already communicating with another mobile radio, by repeatedly switching the transmission and reception channels while chopping. is there. Therefore, location registration can be accepted.
  • the mobile radio 50 (BC, D) has been turned on and the registration has been completed as described in paragraph (1)
  • the mobile radio 50 (B, C, D) has the same system.
  • the calling operation is dialed in the same way as a call from a currently used car telephone. The operation is performed.
  • the mobile station determines at what timing the call signal transmitted from the mobile radio 50 should be transmitted to the uplink control channel (the mobile radio 50 to the radio base station 30 (B, C)).
  • the control unit 58 of the machine 50 knows. This is because, during a waiting state before the calling state, the mobile radio station 50 from the downlink control channel (radio base station 30 (B, C)) already transmitted from a plurality of radio base stations 30 (B, C). This is because the mobile radio device 50 captures the timing and recognizes the timing at which the control signal included in the mobile radio device 50 can be called.
  • the radio base station 30 receives the uplink control signal from the mobile radio device 50, and accordingly receives the uplink control signal in a downlink control channel transmitted from a plurality of radio base stations.
  • the call timing of the wireless base station 50 that wants to make a call is included.
  • the synthesizer 55 — ⁇ , 55-2,..., 55 — n prepares for local oscillation frequency oscillation, but the switching switch 64 — ⁇ selects the synthesizer 55 ⁇ 1. Holds the state where it is fixed at the selected position. Further, it sends a control section 5 8 the control signal to the synthesizer.
  • the 5 5-1 to oscillate the local oscillation frequency for the control channel reception Ri under c
  • the radio base stations 30- ⁇ , 30-2,..., 30- ⁇ around the mobile radio 50 if the radio base station has only ⁇ ⁇ radios, Depending on whether or not communication with the mobile radio is in progress, the following operation is performed to receive the uplink control signal from the mobile radio 50.
  • the radio base station 30 (B, C) currently communicating with another mobile radio device receives the reception and transmission switching controllers 65 C, 67 C of the radio base station 30 ( ⁇ , C).
  • the synthesizers 55-1, 55-2, 56-1, and 56-2 are in operation, of which 55-1 and 56-— are the local stations necessary for communication with other mobile radios.
  • the oscillator frequency is output, and synthesizers 55-2 and 56-2 output the local oscillation frequency that requires communication on the control channel. Therefore, a call from mobile radio device 50 located near radio base station 30 (B, C) is kept in a state where it can be immediately answered.
  • the radio base station 30 (B, C) waiting on the control channel receives the control channel from the radio reception circuit 68. It is fixed as possible. Therefore, in a system that constantly sends control signals or a system that sends control signals intermittently, the wireless transmission circuit 66 and the like are inactive at times other than intermittent transmission. 55—Only ⁇ is in operation.
  • a call request signal is transmitted from the mobile radio device 50 under the above conditions.
  • the call request signal including the ID of the mobile radio device 50 is created by the control unit 58 shown in FIG. 2B and sent to the radio transmission circuit 66.
  • the modulation is applied to the radio transmission circuit 66 and amplified to an appropriate level. It is added to the antenna and sent to the radio base station 30- ⁇ etc.
  • the radio base station 30- ⁇ , etc. which has received this signal satisfactorily, inspects the content of the received signal, stores it in the ID identification storage unit 34 of the radio base station 30- ⁇ , and completes location registration. It confirms that the call is from the active mobile radio 50 and sends a call response signal to the radio system controller 20. If the mobile radio 50 is not recorded in the storage unit 34 of the radio base station 301, it is recorded at this point and a response signal is sent to the radio system controller 20 as described above. Is sent.
  • the radio system controller 20 is to set a communication path with the radio base station 30 having the best reception quality from the mobile radio 50 obtained by the radio base station 30- ⁇ , etc.
  • the station (assumed to be 30-1) investigates a communication channel that is unused at that time and is not likely to cause radio interference, and if there is a radio base station 30- Reply to 1.
  • the radio base station 30-— transmits to the mobile radio 50 using the downlink control channel.
  • the mobile radio 50 receives this signal, inspects the content of the signal, confirms that the communication channel is allocated to the mobile radio 50, and sets the transmission / reception channel to the specified communication channel. change.
  • the c When this wireless system controller 2 0 in switch SW of switch group 2 3 for passing talking path setting is turned on, the telephone portion 5 9 of mobile radio 5 0, hear dial ⁇ Bok over emissions, When the user performs a dial operation, a dial pulse (PS signal) is transmitted via the wireless base station 30, the wireless system controller 20, and the gateway switch 19.
  • Telephone network ⁇ 0, Gateway exchange ⁇ 9, Wireless system A communication (communication) path is set between the control device 20, the radio base station 30 and the mobile radio device 50.
  • the calling operation flow is described above with reference to FIGS. 5A and 5B.
  • station 30 (30— ⁇ ) .
  • the radio system controller 20 and the radio base station 30-1 have already started operation, and the mobile radio 50 has also started operating.
  • the operation is started and the location registration work described in Fig. 4A and Fig. 4B is completed.
  • the handset is raised (off ⁇ hook) and this off is performed using the uplink control channel (QH).
  • QH uplink control channel
  • the hook signal and the ID (identification number) of the mobile radio device 50 are transmitted (S231, FIG. 5A).
  • the wireless base station 30-1 detects the ID of the mobile wireless device 50, and confirms that the ID is already stored in the ID identification storage unit 34 (S232). Then, the wireless base station 30- ⁇ adds the value of the reception quality received from the mobile wireless device 50 and the current idle channel number and sends it out as a call response signal using the transmission path (S233).
  • the radio system controller 20 Upon receiving such a call response signal from the plurality of radio base stations 30, the radio system controller 20 checks the ID (identification signal) from each radio base station 30 and examines the value of the reception quality (S234). ⁇ , Diversity transmission / reception is possible, for example, select 30 to 30-n radio base stations, check the available channels, and send out a signal specifying the communication channel to be used (S235). Transmits the channel CH # to the station 30- ⁇ ⁇
  • the radio base station 30-1 checks the ID of the radio base station 30-1 specified by the radio system controller 20, and also specifies the specified communication channel. (CH>) is vacant, and the channel designation signal is transmitted using the downlink control channel.
  • the mobile radio 50 Upon receiving this channel designation signal, the mobile radio 50 confirms that the designated channel is vacant, switches to the designated channel (S237), and reports the completion of channel switching. Is transmitted using the downlink control channel (S238).
  • the radio base station 30- 30 that has received the switching completion report also performs channel switching and reports the completion (S239).
  • the wireless controller 20 stores the ID of the wireless base station 30-1 and the mobile wireless device 50 and the communication quality in the ID identification storage unit 24 (S240), and controls the switch group 23 under the control of the communication control unit 2 #. For example, SW1-- is turned on to connect the wireless base station 30- to the exchange ⁇ 1 of the telephone network ⁇ 0 (S24 ⁇ ).
  • a dial tone is transmitted from the gateway exchange 19 via the switch group 23 of the radio system controller 20 (S242, FIG. 5B).
  • This dial ⁇ The tone is transferred by the wireless base station 30- ⁇ via the channel CH (down) (S243), received by the mobile wireless device 50, and confirmed that a call (communication) is set ( S244).
  • the mobile radio device 50 transmits the destination dial signal using the channel CHM (uplink) (S 245), is transferred via the radio base station 30-1 (S 246), and operates the gateway exchange # 9.
  • a telephone call (communication) route to the telephone network # 0 destination is set (S247). Thereafter, a call is made (S248).
  • the handset When the call is completed, the handset is hooked up ⁇ (S 249) and turned on ⁇ A hook signal and an end signal are transmitted from the mobile radio device 50 using channel CH 1 (up) (S 250). As a result, the wireless base station 30— ⁇ confirms the end of the call (S 2 5 1) The end call is reported to the radio system controller 20. Therefore, in the radio system controller 20, the switch SW11 of the switch group 23 is turned off, and the call ends (S252).
  • the radio base station 30 communicating with the mobile radio device 50 is limited to ⁇ station (30 ⁇ ), but this is not necessarily required. That is, it is possible to communicate with a plurality of radio base stations 30 from the beginning of a call, as in the case of applying transmission / reception diversity described later. The decision must be made with due consideration.
  • the transmission from the plurality of radio base stations 30 to the mobile radio 50 may be performed at the same time. However, in this case, it is assumed that there is no problem because the call signal is in the same frequency, and the radio base station 30 transmits the control signal outside the band (see Fig. 3 (a)) using different occupied frequency bands. Must be identified on the mobile radio 50 side.
  • the present invention has been described with respect to a call from the mobile radio 50 (B, C, 0, hereinafter, the indications of B, C, D are omitted).
  • the operation flow will be described with reference to FIG. 6A or FIG. 6C.
  • a mobile radio device 50 or the like existing near the radio base station 30-1 stands by on a control channel commonly used by all the radio base stations 30.
  • the control channel transmitted from each radio base station 30 may be different. Also differs for each wireless base station 30. In such a system, the mobile radio device 50 is waiting for one of the downlink control channels. Communication with a plurality of wireless base stations 30 involves the procedure of applying diversity described in (4).
  • FIG. 2A it is assumed that an incoming call signal addressed to the mobile wireless device 50 has arrived from the telephone network # 0 to the wireless system control device 20 via the gateway exchange # 9.
  • the incoming call signal is inspected, and the ID of the called party is checked.As a result, the radio base station 30 (s) whose location is currently registered is searched. Then, the mobile radio device 50 simultaneously transmits an incoming call signal to all the radio base stations 30 whose location is registered via the communication control unit 2 # (S271, FIG. 6A).
  • each wireless base station 30 Upon receiving this signal, each wireless base station 30 searches the ID identification storage unit 34 (C) in its own station and confirms that the ID of the mobile wireless device 50 is stored therein. Then, a signal for the incoming call and the call channel designation request is sent to the mobile radio device 50 with the ID of the radio base station 30- ⁇ added thereto.
  • the mobile radio 50 is called at substantially the same time as the other radio base station 30 by the same operation (S272) c
  • the incoming call signal is received by the mobile radio device 50 waiting on the control channel, the content of the received signal is searched, and if it is confirmed that the incoming call signal is addressed to the mobile radio device 50 (S273), The incoming call confirmation signal is transmitted to the radio base station 30-1, 30-2,..., 30-n using the uplink control channel (S274).
  • the uplink control channel from the mobile radio device 50 is received.
  • the line base stations 30 — ⁇ to 30 — n check the quality of the received signal, confirm the ID of the mobile radio 50 that transmitted (S275), and control the incoming response signal by radio system. It is sent to the device 20 (S276).
  • the call response signal to the radio system controller 20 also includes the ID of the mobile radio 50. Then, upon receiving this incoming response signal, the radio system controller 20 sets the mobile radio 50
  • the radio base station 30— ⁇ Upon receiving this response confirmation signal, the radio base station 30— ⁇ confirms that the ID of the mobile radio 50 has been correctly registered (S
  • the radio base station 30-1 After confirming that the channel has been switched to an empty channel (S285), the radio base station 30-1 switches to this channel and sends a channel switching completion signal to the radio system controller 20. (S286).
  • the radio system controller 20 Upon receiving the channel switching completion signal, the radio system controller 20 operates the call path control unit 2 # to set up a call path to the telephone network ⁇ 0 via the gateway switch 9, and sets the switch group. 23, for example, is turned on, and the wireless base station 301-1 is connected to the telephone network # 0 (S287). Then, a calling signal is transmitted from the telephone network 10 side through the gateway exchange # 9 and the radio network controller 20 (S288, FIG. 6C), and this is confirmed by the radio base station 30-1 (S289). Then, a ringing bell signal is transmitted on the set communication channel CH #, and a ringing tone is generated by the mobile radio device 50 (S291).
  • the handset of the mobile radio 50 is lifted by this ringing tone (off-hook) and (S292), an off-hook signal is sent out on channel CH ⁇ , and transferred by the radio base station 30- ⁇ . (S 293) is received by the radio network controller 20 (S 294), and a call is started between the telephone network 10 and the mobile radio device 50 (S 295).
  • the handset When the call is finished, the handset is taken down, and the on-hook signal and the end signal are sent to the radio base station 30 through the channel CH (S 296). The signal is transferred (S297).
  • the radio system controller 20 Upon receiving the on-hook signal and the end signal, the radio system controller 20 activates the communication control unit 2 # to turn off each SW of the switch group 23 and ends the call (S298).
  • a general telephone in the telephone network ⁇ 0 and the mobile radio 50 (or between two mobile radios in the system) Suppose that communication has started.
  • the number of the radio base stations 30 with which the mobile radio 50 communicates is one, and the communication traffic state in the system, at least the traffic state in the vicinity of the mobile radio 50, is busy busy hour, It is not a busy time (even if the number of wireless base stations 30 is 2 or more, it can be implemented in the same way).
  • control unit 58 in the mobile radio 50 shown in FIG. 2B sends an operation start command signal to each of the transmission switching controller 67 C and the reception switching controller 65 C, In addition to the currently operating synthesizers 55 — ⁇ and 56 — ⁇ , frequency generation is performed so that control channel CH 50 can be transmitted and received to and from synthesizers 55 — n and 56 — n. Request a shake.
  • the control unit 58 starts transmitting a control signal to the wireless transmission circuit 66.
  • This control signal includes the ID of the mobile radio 50, the type of communication (type of voice, data, etc.), and the channel number currently in use.
  • the above conditions for the radio base station 30 are as follows if the radio base station 30 is configured as shown in FIG. 2D or 2E or 2F. This condition can be alleviated because it is possible to communicate with a new mobile radio even while communicating with a third party mobile radio.
  • the output of the transmission mixer 6 ⁇ of the mobile wireless device 50 can be transmitted to the control channel CH 50 in addition to the channel ⁇ ⁇ ⁇ currently being communicated. Can receive the control channel in addition to the currently active communication channel CH. This is described in detail in the operation of channel switching during a call in section (5).
  • the control signal transmitted from the mobile wireless device 50 is received by a plurality of nearest wireless base stations 30 0-2, 30-3, ..., 30-n that are not currently communicating. Then, one of these, the radio base station 30-2, inspects the quality of the received signal and the content of the signal, and as a result, the quality of the signal received from the mobile radio 50 is equal to or higher than a certain value, and If it is determined that the communication quality does not immediately decrease and there is no possibility of interference, the ID of the wireless base station 30-2 and the available A control signal including a channel number (for example, CH 2>) is transmitted to the mobile radio 50, and a report indicating that diversity transmission / reception is possible is made.
  • a channel number for example, CH 2>
  • This signal is received by the wireless receiving circuit 68 of the mobile wireless device 50 and transmitted to the control unit 58.
  • the control unit 58 examines the signal transmitted from the radio base station 30-2, and as a result, determines that it is appropriate to perform diversity transmission / reception, and synthesizers 55-2 and 5-6.
  • the radio base station 30-2 on channel CH 2 (if it is determined that no radio interference will occur, the same channel ⁇ ⁇ may be assigned)
  • Requests generation of local oscillation frequency in order to start communication with the radio base station 30-2 on channel CH 2 (if it is determined that no radio interference will occur, the same channel ⁇ ⁇ may be assigned).
  • the switch group 23 is operated for the communication control unit 2 ⁇ in the wireless controller 20, and the call signal currently being communicated is transmitted to the wireless base station 30-2. It also requires parallel transmission.
  • the radio system controller 20 In response to the request from the radio base station 30-2, the radio system controller 20 receiving this request transmits a voice signal, that is, a voice signal from a general telephone, not only to the radio base station 30- ⁇ but also to the radio base station 30-2. The transmission of the same signal to one or two destinations is started.
  • a voice signal that is, a voice signal from a general telephone
  • the radio base station 30-2 which has received the voice signal, adds the ID of the radio base station 30-2 to the mobile radio 50 and sends it out via the radio channel CH2.
  • the mobile radio 50 since the mobile radio 50 is ready to receive the radio channel CH2, after checking the output of the radio reception circuit 68 that has received this signal, if the quality is good, the audio signal Is transmitted to the telephone unit 59, and the control signal is transmitted to the control unit 58.
  • the mobile radio 50 By executing the above operation, the mobile radio 50 enters the diversity transmission / reception state with the radio base stations 30-1 and 30-2.
  • the diversity transmission / reception execution request signal transmitted from the above-described mobile radio device 50 to the radio base station 30 in the vicinity thereof is transmitted to the radio base station 30-2.
  • Other radio stations 30-3, 30-4, ⁇ ' ⁇ , 30-n receive the same signal, and the radio base station suitable for the conditions among them receives the same response signal as the mobile station 30-1. It should have been sent to.
  • the control unit 58 of the mobile radio device 50 or the radio system control device 20 requires the above-mentioned radio base stations 30-2 and 30-2 to perform diversity transmission / reception with more radio base stations. If the same operation is performed as when diversity transmission / reception is performed between all devices and all operations operate normally, diversity transmission / reception with, for example, the radio base station 30-3 is started.
  • ⁇ ', 30-n diversity transmission / reception is started weekly.
  • the multiplicity of the diversity is the number of radio base stations 30 that can communicate or the multiplicity that can be simultaneously transmitted and received in the mobile radio device 50, that is, the synthesizer 55 in FIG. 2B.
  • the call traffic in the system is not congested.
  • the traffic state is determined by the radio control device 20 or each radio base station 30- ⁇ to 30-n or the mobile radio.
  • the multiplicity of diversity is successively restricted, and at the peak time, the state transitions to multiplicity ⁇ , that is, a state without diversity.
  • the type of communication being communicated voice, data, facsimile
  • systematic processing becomes possible, such as making broadband communications less susceptible to multiplicity restrictions, and ensuring good communication regardless of the type of communication.
  • the present invention has such features as being possible.
  • n— ⁇ radio base stations 30 and ⁇ mobile radios 50 are communicating with each other using n— 1 channel If the communication quality of one of the channels falls below a certain value, the other base station 30 that does not currently communicate with the other base station 30 that satisfies the certain communication quality is not Prior to switching to one of the two channels (new channel) for communication, the switching receiving means and the switching transmitting means are switched at a speed that does not affect the communication signal, and n-2 stations that are continuously transmitting and receiving are switched. The old channel and the new channel other than the channel are temporarily transmitted and received in parallel.
  • FIG. 2A to FIG. 21 show a system configuration for explaining an example of this operation. Hereinafter, description will be made with reference to these figures.
  • the mobile wireless device 50 includes a wireless base station 30-1, 30-2, using a synthesizer 55-1, 55-2, ' ⁇ , 55- (n-1), a wireless receiving circuit 68, and a wireless transmitting circuit 66. " ⁇ , 30— (n-) and the communication channel CH 1, CH 2,. “, CH (n-1).
  • the mobile radio 50 moves away from the radio base station 30-1, and Then, it is assumed that the distance approaches 30—n Then, as the relative distance between the mobile radio device 50 and the radio base station 30-1 increases, the communication quality starts to deteriorate, so the S / N monitoring unit of the radio system control device 20 56 detects (detects a drop below the level.) Note that even the level is set so that the line exceeds the required value.
  • the radio system controller 20 requests all nearby radio base stations 30 to measure the quality of the transmission signal of the mobile radio device 50. In response to this request, each wireless base station 30 that is not currently communicating with the mobile wireless device 50 reports the measured value to the wireless system control device 20.
  • the SZN monitoring unit 22 of the radio network controller 20 having obtained the information such as the CZN value sent from each radio base station 30-n, etc. If the mobile radio 50 is found to have the best value and satisfy the quality standard level L 2 or higher-but 9 >, then the mobile radio 50 is connected to the radio base station 30-n in the call zone (zone). n> Judge that it is approaching the vicinity and decide to switch channels.
  • the channel CH n can be used as specified by the radio base station 30-n. Therefore, the communication channel CH 1 (or any one of CH 2,..., CH n ⁇ 1 and the control channel, which is currently used for communication, but in the following description, it is assumed that CH 1) is used, and the mobile radio 50 against Instruct to prepare for transmission / reception on the same channel QH n (if it is determined that radio interference will not occur even if the currently used wireless channel is given, the same channel may be assigned, for example, channel ⁇ ) I do.
  • the radio system controller 20 After issuing these instructions, the radio system controller 20 also turns on the switch #n of the switch group 23, and the radio base station 30- ⁇ starts transmitting a voice signal using the communication channel n. .
  • the modulation depth of the modulator of the radio base station and the phase of the signal are also substantially the same as those of the other radio base stations 30-2, 30-3, ..., 30-n.
  • the bandwidth of the communication channel is 0.3 to 3.0.
  • Low frequency f DO outside KHz for example, about 100 Hz
  • F D3 '"f D8 for example, 8 waves from 3.8 KHz to 4.5 KHz at intervals of 0.1 KHz
  • the audio signal is also digitally encoded, and both are time-divided. It is also possible to transmit by division multiplexing, as shown in Fig. 3 (b) already explained.
  • Fig. 7 shows the timing chart before and after the channel switching of this system shown in Figs. 2A, 2B and 2C.
  • the radio system controller indicates that the quality of the channel CH1 used between the radio base station 30- ⁇ and the mobile radio device 50 has dropped below the level L.
  • the mobile radio 50 using the channel CH 1 is detected by the SZN monitoring unit 22 of the mobile channel 50 so as to start preparations for enabling the transmission radio waves from the radio base stations 30-n to be received in parallel on the channel CH n. To instruct.
  • the control unit 58 of the mobile radio device 50 uses the synthesizer 55- ⁇ , 55-2, ⁇ “, 55- (n-) to transmit the transmission wave of the radio base station 30- ⁇ by the channel CH ⁇ . , Channel CH 2, transmission wave of radio base station 30-2, ⁇ ,, channel CH n— ⁇ transmission wave of radio base station 30-(n-1) 55-n is also operated, and a frequency is generated by the synthesizer 55-n so that the transmission wave of the channel CHn transmitted from the radio base station 30-n can be received.
  • the radio base station 30- ⁇ and the channel CH Communication with n is started. That is, in the mobile radio device 50, the repetitive switching of the switching switch 64- # receiving the switching drive input signal from the reception switching controller 65C is continued. At the same time, until then, the synthesizer 56— ⁇ , 56- 2, ⁇ ', 56- (n-1) is operated and transmitted to the wireless base station 30- ⁇ ⁇ 30-(n-1) using channels CH to CH n- ⁇ From this state, the synthesizer 55-n is also operated to shift to a state where it can be transmitted to the radio base station 30-n by the channel CHn. The synthesizer used for this transmission 56- , 56-2...: The output of 56-n is repeatedly switched by the switching switch 64-2 with the switching drive input signal from the transmission switching controller 67C.
  • the switching frequency f "j of the switching switches 64-1 and 641-2 in this switching transmission / reception period is set to, for example, 2n times or more the highest frequency included in the signal.
  • the switching frequency is set to an optimum value in consideration of the following conditions.
  • 7) to 9) are items to be considered from the system design point of view.
  • the used frequency bandwidth is ⁇ 5 MHz.
  • the switching frequency of the switching switch 64-2 of the mobile radio device 50 is selected to be about 2 OxnMHz.
  • the switching frequency It is appropriate to use a higher frequency as the number, and a value of about nx 20 KHz to 30 KHz may be used.
  • the respective carrier frequencies of CH,, 23,..., N ⁇ , n applied to the input section of the reception mixer 63 are synthesized by the synthesizers 55 —,, 55-2,..., 55-(n -), 55—
  • the n intermediate frequencies in the output of the intermediate frequency amplifier included in the reception mixer 63 are amplified by the reception unit 53 and then transmitted to the reception unit 53.
  • Demodulated by the included demodulation circuit if there is a frequency difference between the n intermediate frequencies, the demodulated output signal may or may not have distortion.
  • the amplitudes I, I 02 ,..., I 0n of the input waves of the channels CH 1, CH 2,..., CH n applied to the input of the reception mixer 63 are not necessarily the same, and the switching switches 64 — ⁇
  • the time occupancy of the switching in the mobile station is equal (duty ⁇ 00 "n / 0 )
  • since the base station 30-2 is closer than the base station 30- ⁇ usually I 0 2, I o 3, ... , who I 0n is greater than I 01. I, I, ... , and is different from the size of the I 0 n, there is a possibility to generate a cross-modulation. Therefore, as a measure for equalizing the amplitudes of these input waves, it is possible to change the duty in the switching signal of the reception switching control device 65C.
  • FIG. 2B is different from FIG. 2B in that a CZN measurement receiving section 52, a receiving mixer 73, and a switching switch 64-3 are installed separately from the radio receiving circuit 68, and the control of the switching switch 64-3 is performed. This is to be performed by the control unit 58B.
  • the operation of FIG. 2G will be described.
  • a reception mixer 73 is provided at the front stage to operate the C-N measurement receiving unit 52.
  • a part of the reception signal received by the mobile radio 50B is added to the reception mixer 73.
  • the output from the switching switches 64--3 is added as the local oscillation frequency to the reception mixer 73.
  • this switching switch 64-3 does not need to be switched at high speed like other switching switches 64-— and 64-2. For example, a low speed of about 10 Hz is sufficient.
  • the switching switch 643-1 is in a position to turn on the output of the synthesizer 55- ⁇ , the C-N value of the channel CH # measured by the C-N measurement receiving unit 52 is transmitted to the control unit 58B.
  • the control signal transmitted from each wireless base station 30 to the mobile wireless device 50 includes the ID of the wireless base station 30. This ID is required to change the duty of the above-described switching switch. is there.
  • the frequencies of the signals included in the respective control signals are made different from each other. Therefore, the signals are filtered by a filter. It becomes possible.
  • the control unit 58B transmits each signal to each wireless channel. That is, the duty time for receiving (or transmitting) for each radio base station 30 can be determined in association with the CZN value.
  • the receiving section 53 in the peripheral diagram transmits each of the radio base stations 30-1, 30-2,..., 30-0-n It is sufficient to provide a bandpass filter for individually receiving the control signal, and to provide a means for monitoring communication quality such as measuring a signal-to-sound ratio in each of them. Then, the measurement value is reported to the control unit 58, and the switching switch 64-4 is operated with the switching duty according to the signal-to-sound ratio.
  • the distortion noise can be removed by the following method.
  • the switching switch 64- there is a method of increasing the switching speed (period) of the switching switch 64-— so as to drive it out of the bandpass characteristics of the intermediate frequency amplifier.
  • the switching frequency is specified to be 2 n times or more of the highest frequency of the signal, it is not necessary to increase the switching frequency further.
  • the base stations 30——, 30—2,...: 30—n transmitters 31— ⁇ , 31—2,..., 3 This is achieved by increasing the frequency stability of the crystal oscillator.
  • the sound is mixed in the signal band of the sound.
  • FIG. 2H shows a configuration example of the mobile radio 50C in this case.
  • the input radio wave (input signal) to the mobile radio 50C is divided into n equal parts at the antenna input part, and the radio reception circuits 68-1, 68-2, ... ', 68- n And the interference and jamming detector 62.
  • the receiving mixers 63 ⁇ , 63-2,...
  • the output signals of these receiving units 53— to 53—n are sent to the control unit 58C and also to the communication quality monitoring units 57-, 57-2, " ⁇ , 57-n. Then, the communication quality of each wireless channel is monitored, the result is reported to the control unit 58C, and the outputs of the receiving units 53-1 to 53- ⁇ are added to a signal mixing circuit 62, which is used for normal diversity.
  • the receiver (this stage is a composite after detection) and other processing are added and sent to the telephone unit 59.
  • the radio signal switched by the switching switch 64-2 is, for example, sequentially switched between the radio channels CH ⁇ , CH2,..., QH ⁇ , but the radio base station 30- (CH 1), 30- 2 (CH 2),..., or radio base station 30— n (CH n), which are separately received by mobile radio
  • the bandpass filter is output to the output of the transmission mixer 61 so that these components are released into the space and do not disturb the communication of other channels or other systems. It is necessary to provide a wave filter and filter.
  • this switching frequency may be set to be larger than ⁇ 5 X n Hz.
  • the upstream signal of channel QH is transmitted by radio base station 30- ⁇
  • the upstream signal of channel CH2 is transmitted by 30 ⁇ 2, and so on. received by n.
  • These received signals are demodulated and transmitted to the radio system controller 20.
  • the radio base station 30- ⁇ has the configuration of FIGS. 2E and 2F
  • the uplink signal of the channel CH ⁇ is transmitted and received by the transceiver 90- ⁇ of the radio base station 30-1 and the channel CH2.
  • the upstream signal is received and demodulated by the 30-1 transcei
  • the upstream signal of channel CH i is received and demodulated by the 30-transmitter / receiver 90-i. After that, they may be mixed and transmitted to necessary devices such as the radio system controller 20.
  • the audio signals are transmitted to the radio base stations 30-1 and 30-.
  • ' ⁇ , 30 Mix the signals from n.
  • the signals from the radio base stations 30-2, 30-3, ⁇ ' ⁇ , 30-n have better transmission quality than 30- ⁇ , so they may be mixed as they are, or No. Mixing may be performed with an output proportional to N. That is, a reception diversity effect is obtained.
  • the operation of the present invention is to measure the transmission frequency of the mobile radio device 50 at the radio base station 30 to predict the frequency shift after switching to a new communication channel. It is characterized in that by setting and using the transmission channel of the radio base station that communicates after the channel switching at a frequency that is compatible with the above, the noise due to the communication interruption or the intermodulation that occurs due to the channel switching is removed.
  • the wireless receiving circuit 68 of the mobile wireless device 50 includes the wireless base stations 30, 30. 1,..., 30 0—Sent by a call signal of channel C ⁇ ⁇ , C ⁇ 2, ⁇ ' ⁇ , C ⁇ ⁇ from ⁇ , which are sequentially switched by the switching switch 64-1 in the mobile radio 50. Switched and received. Since the switching switch 64-2 also starts operating, the transmission wave from the mobile radio 50 is also started to be switched.
  • the delay time difference due to the difference (within 1 O / iffl) between the routes from the radio system controller 20 to the mobile radio device 50 via the radio base stations 30-1 to 30- ⁇ is: Since it is at most 0.03 msec or less, it can be ignored without any trouble.
  • the downlink signal from the radio base stations 30 0-2, 30-3, ⁇ '30-(n-1) is only an audio signal, but the radio base stations 30- ⁇ and 30- In the downlink signal from ⁇ , in addition to the audio signal, control signals (identification signals for identifying the radio base stations 30- ⁇ and 30-n and switching command signals) are shown in Fig. 3 (a). Since the signal is input in the form of an out-of-band signal as described above, the wireless receiving circuit 68 of the mobile wireless device 50 receives the signal and transfers it to the control unit 58.
  • the control unit 58 identifies this signal, and initially issues a channel switching command from the wireless base station 30- ⁇ and a subsequent channel from the wireless base station 30-n according to an instruction from the wireless system control device 20. ⁇ ⁇
  • the call signal and ID signal using ⁇ are sent, and it is confirmed that the signal quality is good. It reports to the radio system controller 20 via the radio base stations 30-n via the communication channel ⁇ H n for the stations 30-n.
  • the communication controller 2 ⁇ switches. Group 2 3 switches SW 1-, 1-2,..., ⁇ 1 n Turns off only SW 1-1.
  • the mobile radio device 50 stops transmission to the radio base station 30, stops the operation of the synthesizer 55- ⁇ of the mobile radio device 50, and switches the switch 64- ⁇ (second B In Fig. 7, the synthesizers 55-2, 55-3, '..., 55-n are made to perform a cyclic switching operation, and these states are shown in Fig. 7.
  • the mobile radio device 50 transmits to the radio base stations 30-—, 30-2, ' ⁇ , 30-n using the channels C H ,, CH 2,..., CH n.
  • the reception switching controller 65 ⁇ and the transmission switching controller 67C operate according to the instruction of the radio system controller 20, and the switching switches 64— and 64-2 are in operation.
  • the signals sent to the communication channel are out-of-band control signals (see Fig. 3 (a)>) as the signals sent to the communication channel.
  • Channel status (migrating from channel CM, CH2,..., CHn to channel CH2, CH3,..., CHn), identification ID of mobile radio 50, etc.
  • f D1, f D2 Bok over tone signal or their union Align such «a)> is added.
  • the audio signals are mixed with the signals from the radio base stations 30-1, 30-2 ⁇ , 30-n.
  • the radio system controller 20 among the n signals from the radio base stations 30— ⁇ , 30—2,..., “30—n, the radio base stations 30—, 30—2, —”, 30—n
  • the radio system controller 20 confirms that the channel switching operation during the call is progressing smoothly, and instructs the control unit 38 of the mobile radio device 50 to transmit the channel ⁇ via the radio base station 30- ⁇ . , The communication with the wireless base station 30-1 on channel CH1 is stopped, and a command signal for concentrating on communication with the wireless base station 30--2, 30-3,. Send out.
  • the operation of the control unit 58 stops the operation of the synthesizers 55 — ⁇ and 56 — ⁇ , and the switching switch 6 for selecting the reception channel.
  • 5 ⁇ is set to perform the cyclic switching operation, and the switching switch 64-2 for selecting the transmission channel is instructed to continue the cyclic switching operation of the synthesizers 56 ⁇ 2, 5 6 ⁇ 3,. I do.
  • the mobile radio device 50 ends the communication with the radio base station 30-1 using the channel ⁇ 1 up to that point, and the radio base stations 30-2, 30-3, '", 30- ⁇ And communicate using channels CH 2, ⁇ 3, ⁇ , CH ⁇ , respectively. Yes. With this, channel switching is completed, and a state where communication is performed with the new wireless channel group is realized.
  • the above-described switching operation between the up-channel and the down-channel is executed in parallel and ends at about the same time.
  • FIGS. 8A to 8D show a flow chart showing the flow of the operation of the system shown in FIGS. 2A, 2B and 2C.
  • the radio system controller 20, the radio base stations 30-1, 30-2,..., 30-n and the mobile radio 50 start operating, and the switches SW 1-, of the switch group 23 included in the radio system controller 20 are activated.
  • One two,..., ⁇ -1 (n-1) is on, and the radio base station 30— ⁇ , 30—2,..., 30— (n-1) is in communication with the mobile radio 50 using a gurumi. is there.
  • This communication includes a downlink frequency F 1 F 2 and an uplink frequency, ⁇ ⁇ ⁇ ⁇ 2, of channels CH 1, CH 2,..., CH- (n ⁇ 1) specified by the communication control unit 21 included in the radio system controller 20.
  • System controller The SZN monitoring unit 22 of 20 monitors whether or not the communication quality has deteriorated below the level (S ⁇ 03). If the call quality is lower than the level! _ ⁇ ] (S ⁇ 03 YES), the communication control unit 21 sends the radio base stations 30- ⁇ , 30-2, — Wireless base stations in the vicinity such as 1 ⁇
  • Each of the surrounding radio base stations 30 (for example, 30— ⁇ >) receiving the monitor reception instruction monitors the signal of the frequency f «j (S ⁇ 05), and transmits the result to the SZN of the radio system controller 20. report to monitor unit 22 (S ⁇ 06), the monitoring receiving quality from the radio base station 30 measures compared, for example, better than the level L 2 of the communication quality constant reference of the radio base station 30- n, and Then, the communication control unit 2 ⁇ ⁇ detects that the mobile radio device 50 is in the coverage area of the radio base station 30- ⁇ from the zone covered by the radio base station 30-n (S107 YES). (S108, Fig. 8B), and the wireless base station 30-n can use it to switch to communication with the wireless base station 30-n. An empty channel is searched (S109), and as a result, the channel CHn is determined (S ⁇ 10). Command the transmitter 5 ⁇ -2 and the receiver 53-2 of the device 50 to prepare for communication on channel CH n (S ⁇ 1 ⁇ ).
  • the communication preparation command for using this channel CH ⁇ is sent to the radio base station 30-n to prepare for communication using the channel CHn (S ⁇ ⁇ 2). This command is issued at the same time 7 ⁇
  • the mobile radio device 50 receives the communication preparation command using the channel ⁇ Hn (S1 Ch4) and transmits the signal using the channel ⁇ Hn. Preparing for the ability, i.e., the synthesizer the 55- n and 56-n from the control unit 58 receives a frequency F n, and instructed to be transmitted in n the frequency and vibration switching onset
  • the container 65 enters the switching operation (S15, Fig. 8 ⁇ ).
  • the mobile radio device 50 When the mobile radio device 50 is ready to perform communication using the channel ⁇ H n, the mobile radio device 50 reports the completion of preparation to the radio base station 30-n using the channel CH n (S1 16). Upon receiving the report, the radio base station 30-n confirms the completion of the preparation within the radio base station 30-n using the channel CHn prepared in Stezza S ⁇ 2 and issues a report (S1117).
  • the switch SW of the switch group 23 is switched. -, One, two, ..., one (n-1) is kept on, and the switch SW1-n is also turned on (S119).
  • the two communication control units included in the radio system controller 20 instruct the radio base station 30- ⁇ to start communication with the mobile radio device 50 using the channel CH ⁇ . (S ⁇ 20).
  • the radio base station 30- ⁇ Upon receiving this communication start command (S ⁇ 21), the radio base station 30- ⁇ sends a communication start command using the channel CH ⁇ (S ⁇ 22>).
  • the mobile radio 50 transmits the radio base station 30- ⁇ to the base station 30- ⁇ .
  • the start of communication by the channel C ⁇ ⁇ is confirmed by the ID signal which is an identification signal for identification (S ⁇ 23), and the communication including the 1D signal of the mobile radio device 50 is performed by using the channel CH ⁇ .
  • a signal is transmitted (S ⁇ 24), and the wireless base station 30- ⁇ receiving this communication signal reports that it has started communication on channel CH ⁇ (S ⁇ 25).
  • the radio base station 30- ⁇ turns off the communication by the channel CHS (S ⁇ 29), and the radio base station 30-n, which has been instructed to stop the communication by the channel CH ⁇ , turns off its communication.
  • the command is transferred (S130), and when the mobile transceiver 50 receives the command to stop communication by this channel CH1 (S ⁇ 3 ⁇ ), the operation of the synthesizers 55- ⁇ and 56- ⁇ is stopped, and the switch is switched.
  • the communication control unit 2 ⁇ of the radio network controller 20 that has received the communication stop report keeps the switches SW 1 1, 2, 1, 3, ⁇ n n of the switch group 23 on, and switches S W1—Turn off ((S134).
  • the mobile radio device 50 becomes the radio base station 30-2, 30-3,. Between 30- ⁇ , high-quality communication can be continued without interruption of the moment and no mixing of sound, with the effect of transmission / reception diversity (S S35).
  • ⁇ 6 circles indicate the service ⁇ Small zones in the area ⁇ ⁇ to ⁇ 16 respectively, and the radio base stations 30-1, 30- 2, ... installed near the center of the circle ⁇ , 30-16 etc. indicate the areas where communication is possible.
  • the mobile radio 50 currently in communication is in zone ⁇ 6, and the radio base stations 3 0-2, 30-3, 30-5, 30-6, 30-7, 30-1, 0, 30 It is assumed that communication with diversity is applied to seven stations. Assuming that the mobile radio 50 is moving in the direction of the arrow in FIG. 9, the above seven radio base stations receiving the transmission signal from the mobile radio 50 measure the reception electric field or the reception quality, respectively. And these values are collected in the radio system controller 20. In the radio system controller 20, By comparing these measurement results, the moving direction and speed of the mobile radio device 50 are estimated by the following method.
  • the direction of movement is toward the wireless base station (30-7 in Fig. 9), which changes in the direction in which the observed input received electric field level increases rapidly. It is important to choose the measurement duration appropriately in order to obtain highly faithful results. However, this is largely related to the speed of the mobile radio 50. In other words, since the radio wave propagation characteristics change from moment to moment, it is possible to remove the dispersion of the measured values by measuring the time interval (3 to 10 seconds in the case of automobiles) and measuring during that time. .
  • the measurement results obtained in this manner are represented in order from the radio base station 30 where the input electric field increases greatly.
  • the input electric field increases greatly.
  • the traveling speed can be estimated by comparing it with the radio wave propagation curve obtained from the radio wave propagation characteristics.
  • the destination of the mobile radio device 50 is estimated, the communication traffic status of the target radio base station 30 is examined, and when congestion occurs, the radio base station 30 Depending on the type of communication of the mobile radio device 50 during communication, it is possible to reduce the number of radio base stations 30 that communicate.
  • the traffic congestion state is not a single zone but multiple zones. In such a case, it is necessary to take measures for congestion over a wide area. This is a phenomenon that occurs in the central part of a big city in a car telephone system, etc., and it is assumed that 30-6, 30-7, and 30- ⁇ in FIG. 9 are in a traffic congestion state. The application of the present invention to this will be described in detail.
  • a mobile radio device 50a is present in zone Z ⁇ ⁇ and is traveling in the direction of the arrow, but has transmitted a call signal. These call signals are collected by the radio system controller 20 to determine the communication channel to be assigned.
  • the radio base stations 30-6, 30-7, 30-10 , 30--11, 30-two, 30-14, 30-five, etc. are assigned to the communication channels (diversity transmission / reception is performed).
  • channels 30-6, 30-7, and 30-1 ⁇ are not allocated.
  • the radio base station 30 having the best communication quality is naturally 30- ⁇ , but is not allocated for the above-mentioned reason.
  • the radio system controller 20 sets the mobile radio 5 Since the moving direction and moving speed of O a can be estimated, the channels used by the radio base stations 30-8 and 30-6 in the moving direction are assigned. Therefore, the mobile radio device 50a starts communication with the radio base stations 30-8 and 30-6, which are slightly distant, even though they are in the zone Z1.
  • the communication quality between the mobile radio 50 and the radio base station 30 is monitored by the communication quality monitoring unit 37 (see FIGS. 2C and 2D) of the radio base station 30 or the communication quality monitoring receiver 93. (2nd E (See the figure). However, such a communication quality monitoring unit is provided in the mobile radio 50 (see FIGS. 2B and 2H) to measure the communication quality, and the result is transmitted via the radio transmission circuit 66 to the radio base station 30. You may report to.
  • the wireless base station 30B or 30C (Fig. 2D, Fig. 2F) Included transmission or reception switching controller 47, 45 or mobile radio 50 or 50B, 50C ( Figure 2B, 2H) transmission or reception switching controller
  • the switching frequency output from 67 C and 65 C has been described in the direction of increasing the speed, and its operation and effects are described in this section.In this section, the operation and effects when the switching frequency is reduced are described.
  • Low frequency here means low frequency compared to audible frequency, specifically 0 Hz or lower.
  • interference power having a plurality of frequency components will be reduced more than a single frequency. That is, in a noise having many different frequency components, the noise component of a specific frequency is small.
  • the switching frequency is a low frequency, many harmonics are generated in the frequency band. Therefore, in this case, it is not advisable to use the lower frequency band of the voice band as shown in Fig. 3 (a) as the control signal in terms of interference, but rather the upper frequency band should be used.
  • the switching frequency must be low and set to, for example, 1 OHz or less in order to avoid adverse effects on audio signals.
  • the switching frequency of repetitive switching used for switching channels during communication etc. is used because the higher speed has no adverse effect on the control signal using the lower frequency band of the voice signal. Although it is easy to do so, if it is approved that the signal used as a control signal has a slight effect, the low frequency switching operation will also be as follows There is an advantage in this regard. That is,
  • All modulated signal components can be sent to the antenna as effective components without partial filtering.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Système comprenant des stations radio de base (30) qui couvrent un ensemble de zones pour constituer des zones de service, un équipement radio mobile (50) permettant la communication avec les stations radio de base, et une unité de commande de système radio qui relie les stations radio de base à un réseau téléphonique général pour établir ou interrompre une voie de communication entre les stations radio de base et l'équipement radio mobile, et qui ajoute une voie de communication avec une nouvelle stations radio de base avec laquelle il peut établir une communication, lorsque l'équipement radio mobile se déplace. L'équipement radio mobile présente une fonction lui permettant de transmettre ou de recevoir des signaux en direction ou en provenance d'un ensemble de canaux, et établit simultanément une communication avec un ensemble de stations radio de base pour notifier sa position à l'ensemble de stations radio de base. L'équipemnet radio mobile notifie sa position à une station radio de base avec laquelle il peut établir une communication lorsqu'il se déplace, et maintient cette communication sans interruption par l'intermédiaire de toutes les stations radio de base auxquelles la position a été notifiée.
PCT/JP1988/000783 1987-08-28 1988-08-08 Procede de communication avec des stations mobiles et systeme a cet effet Ceased WO1993014576A1 (fr)

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US5101501A (en) † 1989-11-07 1992-03-31 Qualcomm Incorporated Method and system for providing a soft handoff in communications in a cdma cellular telephone system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59104840A (ja) * 1982-12-07 1984-06-16 Nec Corp 移動無線通信方式
JPS6038940A (ja) * 1983-08-12 1985-02-28 Nec Corp 位置登録方式
JPS6167332A (ja) * 1984-09-11 1986-04-07 Matsushita Electric Ind Co Ltd ダイバ−シチ受信装置
JPS6172423A (ja) * 1984-09-18 1986-04-14 Nec Corp 移動通信方式

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55147047A (en) * 1979-05-07 1980-11-15 Nippon Telegr & Teleph Corp <Ntt> Callout reception system for mobile radio
JPS58143643A (ja) * 1982-02-19 1983-08-26 Nippon Telegr & Teleph Corp <Ntt> 空きチヤネル選択方法
DE3278260D1 (en) * 1982-12-21 1988-04-21 Bbc Brown Boveri & Cie Broadcasting method for a mobile radio network
JPH0652956B2 (ja) * 1985-09-13 1994-07-06 日本電信電話株式会社 移動無線通信方式
JPS6292528A (ja) * 1985-10-17 1987-04-28 Nippon Telegr & Teleph Corp <Ntt> 無線ゾ−ン移行検出方式
JPS62101135A (ja) * 1985-10-28 1987-05-11 Nippon Telegr & Teleph Corp <Ntt> 複合無線ゾ−ン移動通信方式

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59104840A (ja) * 1982-12-07 1984-06-16 Nec Corp 移動無線通信方式
JPS6038940A (ja) * 1983-08-12 1985-02-28 Nec Corp 位置登録方式
JPS6167332A (ja) * 1984-09-11 1986-04-07 Matsushita Electric Ind Co Ltd ダイバ−シチ受信装置
JPS6172423A (ja) * 1984-09-18 1986-04-14 Nec Corp 移動通信方式

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JPS6458134A (en) 1989-03-06

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