JPH0487427A - Time division communication method for mobile communication - Google Patents

Abstract

PURPOSE:To gradually decrease the transmitting output by enhancing the compressibility of a signal in a time slot for constituting one subframe of plural subframes, and determining a level of a radio signal based on the multiple load gain obtained by a delimited signal compressed timewise. CONSTITUTION:A barrier exchange 20 exchanges and connects a telephone network 10 and a radio system. A radio base station 30 gives and receives to and from moving radio equipments (100-1-100-n). In this communication method, in the case many kinds of TCM(time division time compression multiple) signals for a service object are contained in one frame, each of them is divided into subframes, the multiple number (number of speech paths) in its subframe, time length of the subframe, compressibility of a signal contained in a time slot, and the highest frequency which an original signal has are taken as parameters, the multiple load gain which a TCM signal has is derived, the system having a decoding TCM signal becomes practicable, and the modulation degree of FM(PM) modulation is deepened, while holding an interference disturbance, etc., within an allowable value, by which the transmitting output can be decreased gradually.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the effective use of multiple load gain of a time compression multiplex signal, which is a modulation signal, in a time division communication method of a wireless communication channel in mobile communication. More specifically, one system accommodates mobile radios with different service targets, such as car phone communication terminals and mobile phones, and one of these mobile radios is given a certain radio channel, When another mobile radio starts communicating with another radio base station using the same radio channel while setting up a radio line and communicating with the opposing radio base station using this, the frequency Eliminate any negative effects on communication between mobile radios and radio base stations due to effective utilization or radio wave propagation characteristics, and at the same time effectively use frequencies by reducing transmission output. It aims to provide a method for improving sexual performance.

[Prior Art] In mobile communication using voice using a small zone method, a method employing a time division time compression multiplex signal is described in the following document.

Literature 1. Ito “Study of mobile phone system - Time division time compression F
Proposal of M modulation method-'' IEICE technical report RC389-11
July 1989 document 2. Ito “Study of mobile phone system - Time division time compression F
Theoretical study of M modulation system” IEICE technical report RC389-39
October 1989 document 3. Ito "Study of mobile phone system - Study of multiple wave propagation characteristics of time division time compression multiplexing FM system -" IEICE Technical Report R
C389-47 January 1990 document 4. Ito "Elucidation of the multiple load gain of time division time compression multiplexed telephone signals and its application to FM mobile communications" IEICE technical report RC389-65 March 1990 In other words, in document 1, the transmission signal (baseband signal) is divided into predetermined time intervals and stored in a storage circuit, and when read out, it is read out at a predetermined time slot at a speed n times faster than the speed at which it is stored in the storage circuit, and the signal accommodated by this time slot is A radio receiving circuit having a receiving mixer that communicates with each other and is built into a mobile radio device and a radio base station in order to angle-modulate or amplitude-modulate a carrier wave and transmit and receive it intermittently in time, and a transmitter. A switch circuit is provided for a wireless transmitting circuit having a mixer, a synthesizer applying voltage to the receiving mixer of the wireless receiving circuit, and a synthesizer applying voltage to the transmitting mixer of the wireless transmitting circuit, and intermittent the output of the synthesizer applied to each. The same method as above is used for the radio base station that communicates with the radio base station that synchronizes both transmission and reception with that of the mobile radio device, and on the receiving side, the radio base station is accommodated in the predetermined time slot. In order to extract only the signal, the radio reception circuit is opened and closed to receive the signal, and the signal obtained by demodulation is stored in a memory circuit, and when it is read out, it is read out at a low speed that is 1/n of the speed at which it is stored in this memory circuit. An example of a system has been reported in which a system is constructed that enables reproduction of the baseband signal, which is the original signal that has been transmitted, by reading out the baseband signal.

Next, in Document 2, there is a study of adjacent channel interference and co-channel interference, which are problems when applying the TCM (time division time compression multiplexing)-FM method as described above to small zones. Possibilities of realizing the system have been shown by appropriately selecting parameters.

In addition, Reference 3 examines the effects of multipath fading that TCM signals receive while transmitting in space, and proposes setting guard times between time slots as a measure to eliminate or reduce this effect. There is.

In general, Document 4 shows that the multiple load gain, which was conventionally known to exist in FDM (frequency division multiplexing) signals, also exists in time division time compression multiplexing (TCM) systems, which is similar to that of FDM signals. It also clarifies its quantification and explains system operation examples. By using this multiload gain to increase the depth of FM modulation, it is possible to significantly reduce the transmission power, and we have obtained the prospect that it will be possible to significantly reduce power consumption in mobile radio equipment. has been reported.

[Problem to be solved by the invention] In the system construction examples shown in the above-mentioned documents A to 3,
There is a single type of service within the system, such as a cordless phone, a mobile phone, or a car phone, and the same type of service object, such as a mobile phone or two image phones within one system.

The case where terminals with different service targets coexist, such as car telephones, is not disclosed.

Similarly, in Document 4, the number of service types is limited to one type, and it is not clear what kind of multiload gain a TCM signal including multiple service targets has, much less how to effectively utilize them. has not been disclosed.

[Means for solving problem 111] TC for multiple types of service targets in one frame
When M (time division time compression multiplexing) signals are included, each is divided into subframes, and the number of multiplexing within that subframe (
The multiple load gain of the TCM signal is determined by referring to Reference 4, taking as parameters the number of communication paths), the time length of the subframe, the compression ratio of the signal accommodated in the time slot, and the highest frequency of the original signal. , we have made it possible to put into practical use a system with composite TCM signals.

[Effect] Even in composite TCM signals, there is a multiple load gain for each service type, and since it has become possible to quantify it, various design parameters of the system including the compression ratio of the signal accommodated in a time slot can be adjusted. It is now possible to specifically calculate the multiple load gain using the method, and by deepening the modulation depth of FM (PM) modulation, it has become possible to gradually reduce the transmission output while keeping interference, etc. within the permissible value. therefore,
It has become easier to design amplifiers, and the rated values of passive circuits such as mixers, resistors, and capacitors can be lowered, making it possible to construct economical systems.

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

A system to which the present invention is applied is a mobile phone.

This is effective when terminals with different service targets coexist, such as video telephones, car telephones, etc., but since the simple service is sufficient to explain the principle, this case will be explained below.

In FIG. 1A, 10 is a general telephone network, and 20 is a gateway exchange for connecting the telephone network 10 and a wireless system. 30 is a wireless base station and a barrier exchange 112
0, a circuit for converting the signal speed, a circuit for allocating and selecting time slots, a control unit, etc. 100-n> and has a wireless transmitting/receiving circuit for exchanging wireless signals.

Here, between the barrier exchange 1120 and the radio base station 30, there is a transmission line that transmits communication signals 22-1 to 22-n including communication signals of communication channels CH1 to CHn and control signals.

FIG. 1B shows a circuit configuration of a mobile radio device 100 that communicates with a radio base station 30.

Received signals such as control signals and call signals received by the antenna section enter a radio reception circuit 135 that includes a reception mixer 136 and a reception section 137, and the communication signal that is the output thereof is sent to a speed restoration circuit 138 and a control section 140. It is input to the clock regenerator 141. The clock regenerator 141 regenerates a clock from the received signal and sends it to the speed recovery circuit 13.
8, the control section 140, and the timing generator 142.

The speed recovery circuit 138 calculates the speed (pitch in the case of an analog signal) of the compressed and segmented communication signal in the received signal.
is restored and input as a continuous signal to telephone section 101 and control section 140.

The communication signal output from the telephone unit 101 is divided into predetermined time intervals by a speed conversion circuit 131, and the speed (pitch in the case of an analog signal) is made high (compressed) and sent to a transmission mixer 133. The signal is applied to the wireless transmission circuit 132 including the section 134.

The output of the modulator included in the transmitting section 134 is transmitted to the transmitting mixer 13
3, the signal is converted to a predetermined radio frequency, transmitted from the antenna section, and received by the radio base station 30.

In order for the mobile radio device 100 to send a radio signal to the radio base station 30 using a time slot that is permitted to be used, timing information from the timing generator 142 shown in FIG. 1B is sent to the control unit 140. It is necessary that it has been obtained through

In this timing generator 142, the clock regenerator 14
1 and a control signal from the control unit 140, the transmission/reception intermittent control unit 123. It supplies necessary timing to the speed conversion circuit 131 and speed restoration circuit 138.

This mobile radio device 100 further includes a synthesizer 121.
-1 and 121-2, and selector switch 122-1.1
22-2, and a transmission/reception intermittent controller 1 that generates signals for switching the changeover switches 1221 and 122-2, respectively.
23 and a timing generator 142, the synthesizer 121-1.12'l-2, the transmission/reception intermittent controller 123, and the timing generator 142 are controlled by the control section 140. Each synthesizer 121-1.1
21-2 is supplied with a reference frequency from a reference crystal oscillator 120.

A wireless base station 30 is shown in FIG. 1C.

N-channel communication signal 22-1 with gateway switch 20
22-n are connected to a signal processing unit 31 forming an interface through a transmission path.

Now, the communication signal 22 sent from the barrier exchange 1120
−1 to 22-n are input to the signal processing unit 31 of the wireless base station 30. The signal processing section 31 is equipped with an amplifier for compensating for transmission loss, and also performs so-called 2-wire to 4-wire conversion. That is, the input signal and the output signal are mixed and separated, and the input signal from the barrier switch 20 is sent to the signal speed conversion circuit group 51. In addition, the output signal from the signal speed restoration circuit group 38 is sent to the signal processing section 31 using the same transmission path as the input signal, and is subjected to barrier exchange! ! 120.

Among the above, the input signal from the barrier exchange 1fi20 is input to the signal speed conversion circuit group 51 including many signal speed conversion circuits 51-1 to 51-n, and is subjected to speed (pitch) conversion at predetermined time intervals. .

Furthermore, the signal transmitted from the radio base station 30 to the gateway exchange 20 is determined by the output of the radio receiving circuit 35 being transmitted to the signal selection circuit group 39.
is input to the signal speed restoration circuit group 38 via the signal speed (
pitch) is converted and input to the signal processing section 31.

Now, the control of the radio reception circuit 35 or the output of the call signal is performed by a signal selection circuit 39 that selects a signal for each time slot.
-1 to 39-n is input to the signal selection circuit group 39,
Here, speech signals are separated corresponding to each speech channel CH1 to CHn. This output undergoes signal speed (pitch) restoration in a signal speed restoration circuit group 38 including signal speed restoration circuits 38-1 to 38-n provided for each channel, and then is input to the signal processing section 31. , after undergoing 4-wire to 2-wire conversion, this output is sent as communication signals 22-1 to 22-2 to barrier exchange R20.
2-n.

Next, the functions of the signal speed conversion circuit group 51 will be explained.

By storing input signals such as audio signals and control signals divided into a certain length of time in a storage circuit, and changing the speed when reading them out, for example, reading them out at a speed 15 times faster than when they were stored, the signal can be read out. It becomes possible to compress the time length. The principle of the signal speed conversion circuit group 51 is the same as when playing back audio recorded by a tape recorder at high speed, and in reality, for example, a CCD (Char
geCoupled Device), BBD
(Bucket BrigadeDeViCe) can be used, and the memory used in television receivers and tape recorders that compress or expand the time axis of conversation can be used (References: Koita et al. "A tape recorder that compresses and expands" Nikkei Electronics July 26, 1976 92-1
page 33).

The circuit using the COD/BBD exemplified in the signal speed conversion circuit group 51 can be used as it is in the signal speed restoration circuit group 38 as described in the above-mentioned literature. This can be achieved by making the reading speed slower than the writing speed by receiving a timing signal from a timing generator 42 that generates timing based on the clock and a control signal from the control unit 40.

The control or audio signals outputted from the barrier switch 20 via the signal processing unit 31 are input to the signal speed conversion circuit group 51, and after speed (pitch) conversion processing is performed, signals are assigned to each time slot. It is applied to the signal allocation circuit group 52. The signal allocation circuit group 52 is a buffer memory circuit that stores one section of high-speed signals output from the signal speed conversion circuit group 51 and receives timing information from the timing generation circuit 42 given in accordance with instructions from the control section 40. Then, the signal in the buffer memory is read out and transmitted to the wireless transmission circuit 32. As a result, when viewed in terms of channel correspondence, communication signals are arranged in series without overlapping in chronological order, and when all control signals or communication signals, which will be described later, are implemented, they appear as if they were continuous signal waves. become.

The state of this compressed signal is shown and explained in FIGS. 2A and 2B.

The output signal of the signal speed conversion circuit group 51 is sent to the signal assignment circuit group 5.
2 and are given time slots in a predetermined order. Figure 2A (a> SDl, 5D2
-, SDn indicate that the speed-converted communication signals are allocated to each time slot.

Here, one time slot accommodates a synchronization signal and a control signal or a call signal as shown in the figure. If the call signal is not implemented, only the synchronization signal is added and the empty slot signal is added to the call signal portion. In this way, as shown in FIG. 2A(a), the wireless transmitting circuit 32
In this case, signals forming one frame are applied to the modulation circuit in time slots SD1 to SDn.

The time-series multiplexed signal to be transmitted is angularly modulated in the radio transmission circuit 32, and then sent out into space from the antenna section.

When making or receiving a telephone call, the wireless base station 30
Regarding the transmission of control signals between the mobile radio device 100 and the mobile radio device 100, it is possible to use either within the telephone signal band or outside the telephone signal band.

Figure 3A shows these frequency relationships. In other words, in the figure (a), it is an example of an out-of-band signal, and as shown in the figure,
The low frequency side (250 Hz>) or the high frequency side (3850 Hz>) can be used. This signal is used, for example, when it is desired to send a control signal during a call.

FIG. 3A (b') shows an example of an in-band signal, which is used when making and receiving calls.

Although the above examples were all tone signals, it is possible to transmit many types of signals at high speed by increasing the number of tone signals or by modulating the tone and making it into a subcarrier signal.

The above is a case where an analog signal is used, but when a digital data signal is used as a control signal, it is also possible to digitally encode the audio signal and transmit the two by time division multiplexing. The circuit configuration in this case is shown in the third
Shown in Figure C. FIG. 3C shows an example of a case where an audio signal is digitized by a digital encoding circuit 91, the audio signal is multiplexed with a data signal by a multiplex conversion circuit 92, and the resulting signal is applied to a modulation circuit included in the wireless transmission circuit 32. However, in digital data signals, there is usually no multiple load gain when multiplexing analog signals, which will be described later, so this point must be kept in mind when designing the system.

Then, it is received by the opposite receiver, and the 3rd C
By performing the operation opposite to that shown in the figure, it is possible to extract the audio signal and the control signal separately.

On the other hand, the signal sent from the mobile radio device 100 is received by the antenna section of the radio base station 30 and input to the radio reception circuit 35. FIG. 2A (b) schematically shows this upstream input signal.

That is, time slot SU1. SU2. ...S
Un is mobile radio 11100-1,100-2°...
, 100-n to the wireless base station 30. Also, each time slot su1. su2,...,s
If the contents of un are shown in detail, as shown in the lower left of FIG. 2A (b), it consists of a synchronization signal and a control signal or/and a telephone call signal.

However, if the distance between the radio base station 30 and the mobile radio device 100 is small or depending on the signal speed, it is possible to omit the synchronization signal. Furthermore, the waveform of the radio carrier wave of the above-described uplink radio signal within a time slot is schematically shown in FIG. 2B (C).

Now, among the input signals that have arrived at the wireless base station 30, the control signal is immediately sent to the control unit 40 from the wireless receiving circuit 35.
added to. However, depending on the size of the speed conversion rate, it is also possible to apply the output of the signal speed restoration circuit group 38 to the control section 40 after performing similar processing on the call signal. Further, the call signal is applied to the signal selection circuit group 39.

A timing signal from a timing generation circuit 42 that generates a predetermined timing is applied to the signal selection circuit group 39 in response to a control signal instruction from the control unit 40, and a synchronization signal and a control signal are applied for each time slot 5tJ1 to Sun. The signal or speech signal is separated and output. Each of these signals is
The signal is input to the signal speed restoration circuit group 38. This circuit has the function of inversely converting the speed conversion circuit 131 (FIG. 1B) in the mobile radio device 100 on the transmitting side, thereby faithfully reproducing the original signal and transmitting it to the barrier exchange 1N2O. become.

The manner in which signals are transmitted in the signal space according to the present invention will be explained below using the required transmission band and the relationship between this and adjacent wireless channels.

As shown in FIG. 1C, the control signal from the control section 40 is applied to the wireless transmission circuit 32 in parallel with the output of the signal allocation circuit group 52. However, depending on the magnitude of the speed conversion rate, it is also possible to apply the same processing as the call signal and then apply the signal from the output of the signal allocation circuit group 52 to the wireless transmission circuit 32.

Next, as shown in FIG. 1B, the mobile radio device 100 also has a circuit configuration required when the radio base 830 functions as a single communication channel. The frequency distribution on the output side when an original signal, such as an audio signal (0.3 KHz to 3.0 KHz >) passes through the signal speed conversion circuit group 51 (Fig. 1C) is shown in Fig. 3B. In other words, as mentioned above If the audio signal is converted 15 times as shown in Figure 3B, the frequency distribution of the signal will be 4,5
This means that the frequency is expanded to KH2 to 45KHz.

In this case, it must be noted that either the frequency distribution of the signal has been expanded, or the form of the waveform has simply been stretched along the frequency axis (similar transformation), and there is no change other than the similarity transformation of the waveform. There is. This is necessary when determining the value of multiple load gain.

Now, FIG. 3B shows a case where the control signal is simultaneously transmitted using the lower frequency band of the audio signal. Among these signals, the control signal (O2 ~ 4,0kH2) i
B and speech signal CH1 (denoted as SDl in 4,5-45kHz2) in a time slot, e.g.
Suppose that it is housed in I. Other time slot SD
The same applies to the audio signals accommodated in 2 to SDn.

That is, time slot SDi (+=2°3,
・, n> accommodates a control signal (0.2 to 4.0 kHz) and a communication signal CHi (4.5 to 45 kHz). However, the signals within each time slot are arranged in chronological order. Therefore, signals in multiple time slots are not applied to the wireless transmitter circuit 32 at the same time.The above control signal is not applied to the wireless transmission circuit 32 when a time slot for the control signal is provided at the beginning of the frame. Also, when using the lower frequency band for other signals,
It may be provided near the frequency band of the communication signal (4.1 to 4.4 kHz or 46 to 46.5 kHz).

These call signals are sent to the wireless transmission circuit 32 along with control signals.
When added to the angle modulator included in the angular modulator, the required transmission band requires at least fo±45 kHz. However, fC is the radio carrier frequency. If there are a plurality of wireless channels given to the system, the speed-up of the signal by the signal speed conversion circuit group 51 is limited to a certain value due to the limitations on these frequency intervals. The frequency interval of multiple wireless channels is f
,. , and let fH be the maximum signal speed due to the above-mentioned speed increase of the audio signal, then an inequality must hold between the two.

f > 2 f H ep On the other hand, in digital signals, audio is usually 64 kb/S
Since the signals are digitized at a certain speed, it is necessary to read the scale on the horizontal axis in FIG. 3B, which describes the case of an analog signal, by raising it by about one digit, but the above relationship also holds true in this case.

Further, the control signal input from the mobile radio device 100 to the radio base station 30 is input to the radio reception circuit 35, but a part of the output is input to the control unit 40, and the other part is input to the signal selection circuit group 39. The signal is sent to the signal speed restoration circuit group 38 via the signal speed restoration circuit group 38. After the latter control signal undergoes a speed conversion (conversion to a low speed signal) that is completely opposite to that at the time of transmission, it becomes the same signal speed as that used in the general telephone network 10 and is transmitted via the signal processing section 31. It is sent to the gate opening switch 20.

Communication using TCM signals according to the present invention does not necessarily require each time slot SD1 to SD as shown in FIG. 2A.
There is no need to provide a guard time between n and SU1 to SUn. However, a guard time may be provided between time slots in order to eliminate the influence of timing deviations of synchronization signals and delayed waves due to multiplexed waves on radio wave propagation. Although the specific value of the guard time varies depending on the system to which it is applied, for example, 0.1 to 0.5 μsec is appropriate for an indoor mobile phone system, and 5 to 10 μsec is appropriate for a car phone.

Another embodiment 30B of a radio base station is shown in FIG. 1D. Here, the difference from the wireless base station 30 shown in FIG. 1C is that there are two signal selection circuit groups 39a and 39b and a signal speed restoration circuit group 38a.

38b, two sets of signal speed conversion circuit groups 51a, 5, respectively.
1b and a group of signal assignment circuits 52a and 52b, the other features are the same as the configuration shown in FIG. 1C. The radio base station 30B is particularly useful when the mobile radio device 100 is a terminal with different service targets, such as a mobile phone terminal, an image terminal, a car telephone terminal, etc., and the composite service for these terminals will be described later.

Below, unless otherwise specified, wireless base station 30.30
8 are collectively referred to simply as the wireless base station 30.

Next, the call originating/receiving operation of the system according to the present invention will be explained by taking the case of a voice signal as an example.

(1) Call origination from mobile radio device 100 This will be explained using the flowcharts shown in FIGS. 4A and 4B.

When mobile radio 1!1100 is turned on,
In the radio receiving circuit 135 of FIG. 1B, the downlink (radio base station 30→mobile radio device 100) radio channel (channel CH
1)).

If the system is provided with multiple radio channels, 1) the radio channel exhibiting the highest received input electric field + i) the radio channel dictated by the control signal contained in the radio channel iii) the radio channel within the radio channel A channel with an empty time slot among the time slots enters the receiving state of a VS channel (hereinafter referred to as channel CH1) according to the procedure defined in each system. This is possible by capturing the synchronization signal within the time slot SDi shown in FIG. 2A(a). In the control unit 140, the synthesizer 121
-1, a control signal is sent to generate a local frequency that enables reception of the radio channel CHI, and the switches 122-1 are also fixed to the synthesizer 121-1 side.

Therefore, when the receiver of the telephone unit 101 goes off-hook (starts making a call) (S201, FIG. 4A), the synthesizer 121-2 of FIG. A control signal for generating a frequency is received from the control unit 140.

Further, the switch 122-2 is also turned toward the synthesizer 121-2 side and becomes fixed. Next, wireless channel CH1
The call control signal outputted from the telephone unit 101 is sent using the telephone unit 101. This control signal has a frequency band shown in FIG.
It is sent using un.

The transmission of this control signal is limited to time slot Sun, and is sent in bursts, and no signal is transmitted during other time slots, so it does not adversely affect other communications. However, if the speed of the control signal is relatively slow or the amount of information in the signal is large and cannot be accommodated in one time slot, the same time slot of the next frame will be displayed after one frame or roughly. - Transmitted using slots.

Specifically, the following method is used to capture the time slot Sun. The control signal transmitted from the wireless base 830 includes a synchronization signal and a subsequent control signal, as shown in FIG.
By receiving this, frame synchronization becomes possible. Roughly speaking, this control signal includes control information such as currently used time slots and unused time slots (empty time slot display). Depending on the system, time slot sD; <i=1.2°...
・When n〉 is used by other communication,
In some cases, it only contains a synchronization signal and a call signal;
Even in such a case, the unused time slots usually contain a synchronization signal and a control signal, and by receiving these control signals, the mobile radio 100 determines which time slot to use to send the calling signal. It is possible to know whether to send the .

Note that if all time slots are in use,
It is not possible to make a call on this radio channel and it is necessary to sweep and search for another radio channel.

In another system, there may be no empty slot indication in any of the time slots, and in this case, the following audio multiplex signals SD1, SD2, . ..., S
It is necessary to search for the presence of Dn one after another and check for empty time slots.

Now, returning to the main topic, the mobile radio device 100, which has received the control information sent from the radio base station 30 by one of the above methods, determines in which time slot it should send the call control signal. It is possible to make a judgment including the transmission timing.

Therefore, assuming that the time slot Sun for uplink signals is an empty slot, it is decided to use this empty time slot, and the necessary timing is determined from the response signal from the radio base station 30 by sending out a control signal for calling. burst-like control signals can be sent out.

If there is a call from another mobile radio at the same time, the calling signal will not be properly transmitted to the radio base station 30 due to call collision, and the operation will have to be restarted from the beginning, but this probability is When viewed as a system, this value is kept to a sufficiently small value. If call collisions are to be drastically reduced, the following method can be used.

Even if the mobile radio device 100 finds an empty time slot in which it can make a call, it does not use the entire time slot, but rather uses only the first half of the time slot for some mobile radio devices and only the second half for other mobile radio devices. This is a method that allows you to use In other words, the portion of the time slot used as a calling signal is divided into several types, and this is used to classify a large number of mobile radios into groups, and each group is assigned a time period within that one time slot. It is a way of giving.

Another method is to create many different frequencies for the control signal,
This is a method of dividing a large number of mobile wireless devices into groups and applying this to each group. According to this method, even if control signals of different frequencies are transmitted simultaneously using the same time slot, no interference will occur at the radio base station 30. The above two methods may be used separately, or when used together, the effects will increase synergistically.

Now, the call control signal from the mobile radio EL1100 is successfully received by the radio base station 30, and the mobile radio 100 ID (
1! If a different number is detected (3202), the control unit 40 searches for a currently vacant time slot. The time slot given to the mobile radio 100 is
That's fine, but just to be sure, run a search. This is to accommodate simultaneous calls from other mobile radios in addition to the mobile radio 100, and to provide time slots suitable for service types and service classifications.

As a result, if the time slot SD1 is vacant, for example, the time slot SD1 of the radio channel CHI is used for the mobile radio device 100, and the time slot uplink (mobile radio device 100 → radio base station 30 ) SUl.

and instructs to use the corresponding downlink (radio base station 30→mobile radio device 100) SDl (S203
).

In response to this, mobile radio I! At step 1100, the device enters a state in which it can receive data at the designated time slot SDI, and selects 5U1 (see FIG. 2A (b)), which is the time slot for the uplink radio channel corresponding to the downlink time slot SD1. do.

At this time, in the control unit 140 of the mobile radio device 100,
The transmission/reception intermittent controller 123 is operated, and the switch 122-
1 and 122-2 (3204>. At the same time, a slot switching completion report is sent to the wireless base station 30 using uplink time slot SU1 (5205>).
, has a dial tone (8206>).

Time slot SU of the radio carrier of this upstream radio signal
The state of No. 1 is schematically shown in FIG. 2B (C). In addition to the time slot SU1, the radio base station 30 also receives SU as an uplink signal from another mobile radio 11100.
3 Sun is included in one frame and sent.

The radio base station 30 that has received the slot switching completion report (
5207>, sends a calling signal to the gateway exchange 20 5208>, upon receiving this, the gateway exchange Ia 20 detects the ID of the mobile radio 100 and selects the necessary switch from among the switch group included in the gateway exchange 20. Turn on (52
09>, send dial tone (3210, 4th
Figure B).

This dial tone is transferred by the radio base E30 (3211), and the mobile radio 100 confirms that the communication path has been established (3212>).

When transitioning to this state, the telephone unit 1 of the mobile radio device 100
Since the dial tone from the 01 receiver is dim, it starts sending out a dial signal. This dial signal is speed-converted by the speed conversion circuit 131 and sent out from the wireless transmission circuit 132 including the transmission section 134 and the transmission mixer 133 using the uplink time slot SU1 (S213>. Thus, the transmitted dial signal is It is received by the radio receiving circuit 35 of the base station 30.

This radio base station 30 already responds to the calling signal from the mobile radio 100, gives the time slot to be used, and operates the signal selection circuit group 39 and signal allocation circuit group 52 of the radio base station 30. So, time for the uphill.
Receive slot SU1 and receive downlink time slot SD
The state has shifted to the state where the I signal is transmitted. Therefore, the dial signal transmitted from the mobile radio 11100 is
After passing through the signal selection circuit 39-1 of the signal selection circuit group 39, it is input to the signal speed restoration circuit group 38, where the original transmission signal is restored, and then passed through the signal processing section 31 to the call signal 22-
Transferred to barrier exchange 11 [20 as 1 (3214>,
A communication path to the telephone network 10 is set up (3215).

On the other hand, an input signal from the barrier switch 20 (initial control signal,
When a call is started, the call signal) undergoes speed conversion at the signal speed conversion circuit group 51 at the wireless base M530, and then
A time slot SD1 is provided by the signal allocation circuit 52-1 of the signal allocation circuit group 52. Then, the time slot S of the wireless channel downstream from the wireless transmission circuit 32
Said mobile radio using D1! Sent to 1100.

The mobile radio 1100 is waiting for reception in the time slot SDI of the radio channel CHI and is received by the radio reception circuit 135, the output of which is sent to the speed recovery circuit 13.
8 is input. In this circuit, the original signal of the transmission is restored and input to the handset of the telephone section 101. Thus, a call is started between the mobile radio device 100 and a regular telephone within the regular telephone network 10 (3216>).

The call is terminated by turning on the receiver of the telephone unit 101 of the mobile radio device 100 (3217>), and the end of the call signal and the on-hook signal from the control unit 140 are transmitted to the speed conversion circuit 1.
31 from the wireless transmission circuit 132 to the wireless base station 30 (3218>), and the control unit 140 stops the operation of the transmission/reception intermittent controller 123 and switches 1221 and 122-2 to the synthesizer 1.
It is fixed to the output ends of 21-1 and 121-2.

On the other hand, in the control unit 40 of the radio base station 30, the mobile radio device 1
When the call termination signal is received from 00, the call termination signal is forwarded to the barrier switch 20.
Turn on the switch and end the call (3220>).

At the same time, the signal selection circuit group 39 and signal allocation circuit group 52 in the radio base station 30 are opened.

In the above explanation, control signals between the radio base station 30 and the mobile radio device 100 are controlled by the signal speed conversion circuit group 51. Although it was explained that the signal speed restoration circuit group 38 etc. are not passed through,
This is for convenience of explanation, and just like voice signals, communication can be carried out without any problem even through the signal speed conversion circuit group 51, signal speed restoration circuit group 38, control signal speed conversion circuit 48, or signal processing section 31. be.

(2) Incoming call to mobile radio 100 The mobile radio V11100 is on standby with the power turned on. In this case, as explained in the section regarding the call origination from the mobile radio m1oo, it is in a waiting state to receive a downlink control signal of the radio channel CH1 according to the procedure determined by the system.

Assume that an incoming call signal to the mobile radio device 100 arrives at the radio base station 30 from the general telephone network 10 via the barrier switch 20. These control signals are transmitted as communication signals 22 to the control section 40 via the signal rate conversion circuit group 51 and the signal allocation circuit group 52, similarly to the voice signals. Then, the control unit 40 selects an empty slot among the downlink time slots of the radio channel CHI addressed to the mobile radio 100, for example, S
ID signal of the mobile radio 100 using Dl, 10 incoming call signal display signal, 10 time slot usage signal @ (mobile radio Vs1
For transmission from 00, for example, SUI corresponding to SDl
). Mobile radio 11 that received this signal
At 1100, the signal is transmitted from the receiving section 137 of the radio receiving circuit 135 to the control section 140. The control unit 140 confirms that this signal is an incoming call signal to its own mobile radio 100, so it causes the telephone unit 101 to emit a ring tone, and at the same time, calls the designated time slot SD1. The transmission/reception intermittent controller 123 is operated to stand by at SU1, and the switches 122-1 and 122-2 are started to be turned on and off. In this way, the state has shifted to a state in which calls can be made.

(3) Example of System Construction Capable of Composite Services Above, the case where a single service is provided by the system according to the present invention has been described, but the mobile radio device 100 is a mobile phone terminal 2 and an image terminal.

The system according to the present invention exhibits its characteristics when terminals with different service targets coexist, such as car phone terminals. This will be explained using FIGS. 1D and 1D.

The signal processing unit 31 of the radio base station 30B in FIG.
The gateway switch 20 in Figure A and the communication channels CHI to CHn
Communication signals 22-1 to 22-1 including each call signal and control signal
They are connected by a transmission line that transmits 22-n.

Now, open gate exchange 8! Communication signal 22 sent from 20
-1 to 22-n are the signal processing units 31 of the wireless base station 30B;
is input to. The signal processing section 31 is equipped with an amplifier for compensating transmission loss, and also has a so-called 2-wire-4
In addition to the functions already explained, such as line conversion,
When receiving a call, the following functions are available.

Based on the ID signal included in the control signal addressed to the specific mobile radio device 100 from the gate switching exchange 20, the radio base station 30B
identifies whether the incoming call is addressed to a mobile phone or a car phone, and based on this result determines whether to send the signal to the signal speed conversion circuit group 51a (for mobile phones) or 51b (for car phones). Here, the signal speed conversion circuit groups 51a and 51b are respectively the same as the signal speed conversion circuit group 51 in FIG. 1C.

As an ID identification method, for example, a simple method is to identify a mobile phone if the last digit of the phone number is an even number, and a car phone if the last digit is an odd number. A slightly more complicated method is to use one of the four digit numbers.
Those in the 5000s and 6000s are identified as mobile phones, and the others are identified as car phones. Furthermore, there are various methods such as identifying a mobile phone if the last two digits are 40 or less, and identifying it as a car phone if the last two digits are less than 40.

By identifying as described above, the input signal from the barrier exchange 20 is sent to the signal speed conversion circuit group 51a, 51b, and subsequent processing of the signal follows the process described above. However, what should be kept in mind here is that
The signal speed conversion circuit groups 51a and 51b have different speed conversion speeds. In other words, mobile phones have faster signal conversion speeds than car phones, and
This is because the guard time is reduced.

The reason for doing the above is that, as described in Document 3, the method for removing adverse effects differs depending on the difference in multiwave propagation characteristics.

On the other hand, the output from the radio receiving circuit 35 includes a signal from a mobile phone or a car phone, and the former is input to the signal selection circuit group 39a, and the latter to 39b, where it is subjected to the signal processing described above. become. Here, the signal selection circuit groups 39a and 39b are respectively the same as the signal selection circuit group 39 in FIG. 1C.

The signal speeds of the signals from the mobile phones and car phones selected by the signal selection circuit groups 39a and 39b, respectively, are restored by the signal speed restoration circuit groups 38a and 38b, respectively. Here, the signal speed restoration circuits n38a and 38b are respectively the same as the signal speed restoration circuit group 38 in FIG. 1C. The signals that have undergone speed restoration processing are transmitted to the barrier exchange 20 by the signal processing unit 31 using the same transmission paths as the respective input signals.

The frame structure of the above composite signal is shown in FIG. 2C. FIG. 3(a) shows an output signal of the wireless transmission circuit 32 of the wireless base station 30B, and the structure of one frame is divided into subframes a and b. Subframe a is mobile radio l1100
It shows the time slot sequence for mobile phones,
Subframe b shows a car phone. The time width and guard time of the time slot of subframe a are smaller than those of subframe b because
This is because the multiple load gain, which will be described later, is large and is less susceptible to the effects of multiple wave propagation. Although an example is shown in which the last time slot of each subframe is used as the synchronization signal, some systems use only one synchronization signal per frame.

Note that, in one frame of FIG. 2C, there is shown a case where an unused subframe (empty subframe), which will be described later, exists, and this subframe a.

An unused subframe with a period equal to the difference between the sum of the periods b and the period of one frame can be used for transmitting other signals, and in the case of the small zone method, can be used for transmission signals from adjacent wireless base stations. This improves the effective frequency utilization rate.

The calling/receiving operations in the composite service shown in FIGS. 1A, 1B, and 1D are not much different from those already explained in FIGS. 4A and 4B.

However, the type of terminal is ID-identified depending on whether it is a mobile phone or a car phone, the speed conversion or restoration speed of each signal is different, and the transmission output of the wireless base station 30B is also significantly different. To explain the transmission output of the wireless base station 30B, SCPC (Single Channel P
er Carrier) method, that is, the transmission power for a normal cordless phone is 10 mW, and for a car phone it is 5 mW.
It is W. Therefore, it can be seen that the car phone must provide a transmission power 500 times higher than that of the mobile phone (5W/10mW=500), that is, unless the difference in the multiple load array 1q, which will be described later, is not taken into consideration. In reality, the multiplexed load sequences 1q of each signal are also different, so the above-mentioned significant difference in transmission power level does not necessarily occur.

If the system design is improved, it is possible to reduce the level difference.

In the following, a method will be described in which subsystems having different transmission powers as described above can coexist within one system.

(4) Regarding multiple load gain of composite TCM signal and system construction According to Reference 4, the frame length Tt is Tt > 1/ (2fh) where fh is the highest frequency of the audio signal and the number of multiplexes is n. In this case, the multiple load gain is assumed to be equal to the multiple load gain of a frequency division multiplexed signal having a multiplex number determined by the value n' = nx1/(2fhTt) (1).

However, Equation (1) above assumes that the density of the CM signals within a frame is constant, and as shown in Figure 2C, time slot widths or guard time lengths differ within a frame. In the case of slot arrangement, the density of the TCM signal is not uniform, so simply substitute the total number of time slots, frame length, and Nyquist frequency into equation (1) to find the FDM equivalent multiplex number, and calculate the multiple load gain from this. Even if we obtain the value of , it will lack accuracy.

Below, we will derive a formula that provides accurate multiple load gain even when the time slot density is not uniform as shown in FIG. 2C. To do this, the frame is divided into several subframes, and if the signal density (time slot density) is constant within each subframe, then the multiple load gain within this subframe will show the correct value. Become.

That is, the frame length T1 is divided into subframes T1°T2.
..., Tk, and the number of multiplexes in each subframe is nl, n2, ... nk, and assuming that all signals are telephone signals, the multiplex load gain of the CM signal present in each subframe is can be found by thinking as follows. For example, FD in subframe T1
As for the number of multiplexes in terms of M, it is sufficient to assume that only T1 of the frame length T is multiplexed, and set the number of multiplexes to O at other times. That is, nl' = r11 x 1/ (2fhTl) + O
x1/(2f1.(T1-T1))=n1X1/(2
fhT1) (1-1> Similarly, for n2.n3.... nk, n2
=n2 x 1 / (2f hT2)n(=nkx
It is equal to the multiple load gain of a frequency division multiplex signal having a multiplex number determined by a value of 1/2fhTk (1-k). Therefore, the multiload gain for a frame is obtained from the total number of signals (total time slots) contained within the frame and the total frame length (total of implemented subframes) occupied by the signals. Therefore, this is called the intra-frame average multiple load gain.

However, even if such values are determined, as will be described later, as system design parameters, it is necessary to determine the required multiple load gain and transmission power for each subsystem for mobile phones and car phones. Furthermore, it is necessary to configure the hardware that implements the system for each subframe.

In the following, a specific system example will be used to find the multiple load gain, etc. of each subframe of a composite TCM signal, and a construction example for realizing this will be explained.

First, the case where the compression ratios of the signals accommodated in the subframe for a mobile phone and the subframe for a car phone are set to different values will be explained using FIGS. 2D (a) and (b). In the same figure, (a> and (b) both show the wireless base station 3.
The time slot of the output of the wireless transmitter circuit 32 of 0 is shown.

In Fig. 2D (a), subframe A for mobile phones (subframe length 10 m 5ec) and subframe B for car phones (subframe length 1m5ec) form one frame (frame length 11 m 5ec). It consists of Here, the multiplex number n for mobile phones is 500 (time slots 5Da-1 to 5Da-n), and the multiplex number m for car phones is 50 (time slots 5Db-1 to SDa
-m> and V, if we ignore the cart time (the gap between time slots), then
The width of the time slot is 10 msec/500=1 msec 150
Therefore, the signal compression ratios in subframes A and B are equal.

In FIG. 2D (b), the signal compression ratio of only subframe A for mobile phones is further increased by 10 times, the subframe length is set to 1 m5ec, and the subframe length of (a> is 101
It is 1/10 of IISeC.

Here, subframes a and b each occupy only 1 msec of the frame length of 11 m5ec, so the empty time slot period in which no time slot is accommodated is g m sec.
Existing. In a system with a small zone configuration, this empty time slot period is reserved for transmission from an adjacent radio base station, and no carrier wave is transmitted during this empty time slot period. Therefore, there is no possibility of co-channel interference occurring.

Also, a mobile radio t110 communicating with this radio base station 30
In the case of a mobile phone, the transmission signal from 0 is transmitted within the subframe period of the uplink signal corresponding to subframe a of the downlink signal, and in the case of a car phone, within the period of the subframe of the uplink signal corresponding to the subframe b of the downlink signal.
Transmission will be performed within the subframe period of the uplink signal corresponding to the respective uplink signals. FIG. 2C (a) is a generalized representation of the downlink signal in FIG. 2D, and FIG. 2B (b) similarly represents an uplink signal.

The reason for different signal compression ratios for mobile phones or car phones will be explained below while showing system design examples using FIGS. 2C and 6.

In FIG. 2C, the system parameters of each subframe are determined by the number of time slots in FIG.
b-c are excluded), the time length of frames a and b,
Assuming that the time length of the time slot and the time length of the guard time are the same, the signal compression ratio can be obtained as shown in the signal compression ratio of FIG. However, the amount of increase in compression ratio due to the presence of the guard time length was also taken into consideration. Therefore, the amount of increase in the signal compression rate of the mobile phone explained in FIG. 2D is determined as shown in the same figure. Therefore, T for each subframe
The multiple load gain of a CM signal is found under the conditions of the number of time slots and subframe time length shown in Figure 6 with reference to Figure 5, and the multiple load gain within the subframe is calculated as follows: Given as shown in column. Here the fifth
The figure is a diagram showing the multiple load gain obtained with reference to Document 4.

Similarly, the intra-frame average multiload gain is determined and is also shown in FIG.

Using the multiple load gain obtained in this way, the required transmission power for each subframe a and b is determined below. First, in the case of subframe a for mobile phones, although the intra-subframe multiple load gain is 30 dB, the increase in modulation deviation amount is suppressed to 2QdB, which is 10 dB less than the intra-subframe multiple load gain of 30 dB. . The reason for this is that the signal compression rate increases by 1 QdB, and therefore the highest frequency of the signal is 10 times higher. Therefore, the transmission power can be determined by the following equation. In subframe a, 10 log[10mWx 500] -20dB=1
7 dBm, that is, 50 mW Next, the transmission power of subframe b for car telephone is determined. In this case, the multiple load gain within subframe b is 13d8 from FIG. 6, but the modulation deviation increase amount is 25 dB. That is, it gives an average multiple load gain of 25 dB within the frame. The reason for this is as follows.

Generally, the maximum amount of interference that causes interference in the same channel or adjacent channels is given by average power rather than instantaneous power. Therefore, even if a modulation deviation of 12 dB is given to subframe b, the value equal to the intra-frame average multiple load gain (
25 dB>, which is within the permissible range as the average power that causes interference.

Considering the above reasons, subframe b for car phone
The transmission power of is given by the following equation.

In subframe b, 10 1Cg [5 inches x 50 cos -25d13=29
The value of the required transmit power in dBm or 800 mW is also shown in FIG. However, the required transmission power at 5 cpc was set to 10 mW for mobile phones and 5 W for car phones.

As explained above, the advantages obtained by significantly increasing the signal compression rate and shortening the frame time length can be summarized as follows.

i) Since the multiple load gain in a subframe with an increased compression rate increases compared to the case where the compression rate is not increased, this can be used to reduce transmission power.

) The existence of a subframe with a higher compression rate increases the multiplexing gain of the entire frame, so if there is a subframe with a less large multiplexing gain within the same frame, the subframe has a substantial This provides an increase in multiple load gain, which can be used to reduce transmission power.

As a result, even if there are different service types within one system and the level difference between their required transmission powers is large, this can be alleviated. For example, 5C
If the required transmission power of a PC is 1QmW for a mobile phone and 5W for a car phone, the level difference is 1010(] (5000/
10) = 27 (dB), but in the system example shown in Fig. 6, it becomes 29-17 = 12 (dB), which shows a significant decrease. Further, by reducing the level difference, the following advantages arise.

a) Design of the transmission power amplification section becomes easier.

b) Since a mobile radio that communicates with a radio base station has a transmission level comparable to that of a car phone, it becomes easy to design a radio that can also be used as a mobile phone.

C) The existence of subframes with a high compression ratio makes it possible to form unused subframes (empty subframes) within a frame, and these empty subframes can be used for sending other signals, as well as for small In the case of the zone method, when used for transmission signals from adjacent wireless base stations, the effective frequency utilization rate improves.

Next, a specific method for obtaining transmission signals required for transmitting each subframe a and b in FIG. 6 using the radio base station 30B shown in FIG. 1D will be described. Therefore, the detailed configuration of the wireless transmission circuit 32 shown in FIG. 1D will be explained using FIG. 7A.

In FIG. 7A, from the left, the output of the signal assignment circuit group 52a (signal group included in subframe a) or the output of the signal assignment circuit group 52b (signal group included in subframe b) has an intra-frame amplification degree. Variable baseband amplifier 32
1. As its name suggests, the intra-frame variable amplification baseband amplifier 321 is capable of varying the amplification (output level) for each subframe of the signal making up the frame using timing information from the timing generation circuit 42. , techniques for variable amplification are well known.

FIG. 7B shows an example of a change in amplification degree. In this case, the amplification degree changes between subframe a and subframe b as shown in the figure. Therefore, this change in amplification degree is periodically repeated over time. Thus, if the operating conditions of the intra-frame variable amplification baseband amplifier 321 placed before the FM modulator 322 are set to give an amplification of 20 dB in subframe a and 25 dB in subframe b, the modulation deviation It is possible to obtain the required value as a quantity. However, the input level of the intra-frame amplification variable baseband amplifier 321 is
It was assumed that both were the same. Next, on the output side of the FM modulator 322, an intra-frame amplification variable high frequency amplifier 323 is installed again, and the operating conditions for this are set to an output level of 17 dBm (50 mW>) in subframe a, and the same 29 dBm in subframe b. (If the setting is made so that 800 mW> is obtained, a system that satisfies the design parameters will be constructed.
In a period within a frame, during a time that does not belong to either subframe a or subframe b, the amplification degree is O1, that is, a state in which no signal is transmitted.

The above is a case where the radio base station 30B transmits, but a case where the mobile radio device 100 transmits will be explained. The transmission signal of mobile radio 100 is simpler than that transmitted by radio base station 30B. This is because the mobile radio device 100 is configured for each purpose, such as a mobile phone or a car phone, and the required transmission power and modulation shift amount are determined for each subsystem. Among these, the transmission power differs in each system due to the transmission antenna gain and the loss of the feeding system, but the modulation deviation amount of the FM modulator is the same as that of the corresponding signal transmitted from the wireless base station 30B. The transfer quantity is given in the same way as when constructing a normal system. To be more precise, I would say downhill (
(transmitted by the wireless base station 30B and received by the mobile wireless device 100)
The frequency bandwidth given to the line and the uplink (mobile radio ta)
This is because if the frequency bandwidth given to the line (transmission by the radio base station 100 and reception by the radio base station 30B) is the same, the frequency efficiency is highest when the system is operated under the above conditions.

The example described here is a case of constructing a system that includes two subsystems that provide the same service content as a phone call, but with different service targets: a mobile phone carried by a person and a car phone used in a car. It is not limited to just these, but it may include different service contents such as telephone and image communication, or it may include three or more types of services.
Even if the degree of signal compression, multiple load gain, degree of signal amplification, or required transmission output level differs, it is possible to construct a system in the same way.
The case of a CM signal will be explained.

- subframe a in Figure 2C for telephone, subframe b
is an image signal, and the service type is a car videophone or a mobile videophone. If the frame length Tt is T > 1/(2fh) (>1/(2gh) where qh is the highest frequency of the image signal, the multiple load gain of the TCM signal present in each subframe is Using the same concept as above, we obtain the following formula.

nl' = n1 x1/ (2fI, TI > (2-
1> n2 = n2 xi/ (2QhT2) From the above formula,
It is equal to the multiload gain of a frequency division multiplexed signal with a multiplicity of n1' or n2'. Therefore, the required transmission power for each subframe a and b can also be determined in the same manner as described above.

However, since there is no literature that has clarified the multiple load gain of the image signal, it is necessary to find it separately.

[Effects of the Invention] As is clear from the above explanation, the time division time compression multiplex signal is composed of composite signals such as many types of signals and signals that enable many types of services, which have not been clearly shown in the past. As a result of quantitatively clarifying the multiple load gain possessed by using the system parameters for each basic signal group that makes up the composite signal, we found that the depth (deviation) of angular modulation for each basic signal group can be calculated as the multiple load gain. It is possible to suppress the influence on other wireless channels within the conventional design value even if the transmission is deepened by the amount of , or the amount of average multiload gain within the frame, and
It has become possible to gradually reduce the transmission output level per wireless channel compared to conventional systems, resulting in power savings. Furthermore, by increasing the compression rate of the signals accommodated in the subframes, empty subframes are created, which can then be used by adjacent radio base stations, thereby improving the effective frequency utilization rate. Furthermore, in the past, there was a large difference in transmission power depending on the type of service, but according to the present invention, since the intra-frame average multiple load gain can be effectively used, this difference in transmission power can be significantly reduced. It is now possible to use the phone as well. Furthermore, in terms of specific circuits, it has become possible to design amplifiers and determine the ratings of passive elements in a rational and economical manner, so the effect on communication systems, especially wireless systems, has been reduced. Extremely large.

[Brief explanation of the drawing]

Figure 1A is a conceptual block diagram showing the concept of the system of the present invention, Figure 1B is a circuit diagram of a mobile radio used in the system of the present invention, and Figure 1C is a wireless base used in the system of the present invention. FIG. 1D is a circuit diagram showing another embodiment of the wireless base station used in the system of the present invention; FIG. 2A is a diagram illustrating time slots used in the system of the present invention. FIG. 2B is a diagram showing the radio signal waveform of the time slot; FIGS. 2C and 2D illustrate other embodiments of the time slot used in the system of the present invention. Figures 3A and 3B are spectrum diagrams showing the spectrum of speech signals and control signals, Figure 3C is a circuit configuration diagram for multiplexing voice signals and data signals, and Figures 4A and 3B are spectrum diagrams showing the spectrum of speech signals and control signals. Figure 4B is a flow chart showing the flow of the operation of the system according to the present invention, Figure 5 is a diagram showing the relationship between the multiplex load gain of a time division time compression multiplexed signal and the number of multiplexed audio signals, and Figure 6 is a diagram showing the relationship between the multiplexed number of audio signals. Figure 7A is a circuit configuration diagram showing the internal configuration of the radio transmitting circuit of the wireless base station shown in Figure 1D, and Figure 7B is Figure 7A. FIG. 3 is an amplification characteristic diagram of a variable amplification amplifier of the wireless transmission circuit shown in FIG. 10... Telephone network 20... Gateway switchboard 22
-1 to 22-n...Communication signal 30...Radio base station 31...Signal processing section 32
...Wireless transmission circuit 35...Wireless reception circuit 38.
...Signal speed restoration circuit group 38-1 to 38-n...Transmission speed restoration circuit 39...
Signal selection circuit group 39-1 to 39-n...Signal selection circuit 40...Control unit 41...Clock generator 42...Timing generation circuit 51...Signal speed conversion circuit group 51-1... 51-n...Signal speed conversion circuit 52...
Signal assignment circuit group 52-1 to 52-n...Signal assignment circuit 91...Digital encoding circuit 92...Multiple conversion circuit 100, 100-1 to 10O-n-...Mobile radio device 10
1...Telephone unit 120...Reference crystal oscillator 121-1, 121-2...Synthesizer 122-1
, 122-2...Switch 123...-Transmission/reception intermittent controller 131...Speed conversion circuit 132...Wireless transmission circuit 133...Transmission mixer 1
34... Transmission section 135... Radio receiving circuit 1
36...Receiving mixer -37...Receiving section 138.
... Speed restoration circuit 141 ... Clock regenerator 321
...Intra-frame amplification variable baseband amplifier 322...FM modulator 323...Intra-frame amplification variable high-frequency amplifier. Among the agents: 1) Kosan (1 idiot) back side C ≧ Mi 1 (circulation notification U cup Yo 8 notification, ≠ - to 3850 Hz Figure 3A Chūyahat @ is from Banquet 42 Figure 7A '／3 figures

Claims (1)

[Scope of Claims] Each radio base means (30) each covers a plurality of zones to constitute a service area, and a frame structure for moving across the plurality of zones and communicating with the radio base means. a barrier exchange means (20) for exchanging communications with each mobile radio means (100) using a radio channel carrying temporally compressed delimited signals in time slots of In the communication method, the frame structure includes a plurality of subframes with different arrangement densities of the time slots, and the signal in the time slot constituting at least one subframe among the plurality of subframes is The radio base means and the mobile radio means have a compression ratio higher than that of the signals in time slots constituting other subframes, and based on the multiple load gain obtained by the temporally compressed segmented signals, the radio base means and the mobile radio means A time-division communication method for mobile communications that determines the level of the radio signal used for communication between