JPH0541685A - Diversity communication method for time division movable body communication - Google Patents

Abstract

PURPOSE:To obtain the time diversity effect with small transmission power in the movable body communication putting a time-compressed signal on a frame time slot. CONSTITUTION:The compression rate in the case of time-compressing a signal to be transmitted between a radio base station 30 and a mobile radio equipment 100 is improved to increase the number of multiplications of a signal, thereby the multiple load gain is increased to enable the reduction of the transmission power. Thus, in spite of the small transmission power, the increase of the number of multiplications permits the transmission of the same signal for plural times, resulting in obtaining the diversity effect.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diversity communication method between a radio base station for time division communication of a radio communication channel in mobile communication and a mobile radio. More specifically, one of many radio channels provided to the system is provided, and a service is provided using this.
While one of a large number of mobile wireless devices in the area is communicating with an opposing wireless base station by using a communication signal by setting a wireless circuit by, for example, a telephone signal, another mobile wireless device is the same. When a user desires to communicate using a wireless channel, the same between the other mobile wireless device and the wireless base station without adversely affecting the communication between the already communicating mobile wireless device and the wireless base station. The present invention relates to a diversity communication method for a time division communication system of the same radio channel, which enables independent transmission and reception by setting up independent radio lines using the radio channel.

[0002]

2. Description of the Related Art In mobile communication using voice to which a small zone method is applied, a method using a time division time compression multiplexed signal is described in the following document.

Reference 1. Ito "Study on mobile phone systems-Proposal of time division time compression FM modulation system-" IEICE Technical Report RC
S89-11 July 1989

Reference 2. Ito "Study on mobile phone systems-Study on multipath propagation characteristics of time division time compression multiple FM system-"
IEICE Technical Report RCS89-47 January 1990

Reference 3. Ito "Elucidation of multiple load gain of time division time compression multiplex telephone signal and its application to FM mobile communication" IEICE Technical Report RCS89-65 Mar. 1990.

That is, in Reference 1, the transmission signal (baseband signal) is divided into predetermined time interval units and stored in the memory circuit, and when reading this, it is n times faster than the speed of storing in the memory circuit. Built in mobile radios and radio base stations to read at a predetermined time slot, angle-modulate or amplitude-modulate a carrier wave with the signal accommodated in this time slot, and to transmit and receive intermittently in time. , A switch for a radio receiving circuit having a receiving mixer that communicates with each other, a radio transmitting circuit having a transmitting mixer, a synthesizer applied to the receiving mixer of the radio receiving circuit, and a synthesizer applying to the transmitting mixer of the radio transmitting circuit A circuit is provided, and the output of the synthesizer applied to each is interrupted, and this interrupted state is transmitted and received. For the wireless base station that communicates with each other in an expected manner, the same method as described above for synchronizing the intermittent transmission and reception with that of the mobile wireless device is used, and the receiving side extracts only the signal accommodated in the predetermined time slot. Therefore, by opening and closing the wireless receiving circuit, receiving and demodulating, the signal obtained is stored in the memory circuit, and at the time of reading this, by reading at a low speed of 1 / n of the speed stored in this memory circuit, A system example in which a system that enables reproduction of a transmitted baseband signal, which is an original signal, is constructed has been reported.

In Reference 2, the effect of multipath fading that a TCM signal receives during transmission in space is examined, and guard time is set between time slots as a measure for removing or reducing this effect. I suggest you do.

Further, in Reference 3, the multiplex load gain, which has been known to exist in the FDM (frequency division multiplex) signal in the past, has a multiplex load gain similar to that of the FDM signal in the time division time compression multiplex (TCM) system. Reveal that, and
It explains the quantification and operation examples of the system. Then, by using this multiple load gain to deepen the modulation depth of the FM, the transmission power can be significantly reduced, and it is expected that the mobile wireless device can achieve a significant power saving. Has been reported.

However, regarding the signal transmission of this system, no description has been given regarding measures for eliminating the adverse effects of fading that occurs when transmitting a transmission medium, particularly space, such as transmission diversity. In addition, a system is required when a time-divided signal is obtained from a large number of analog telephone signals as described in Document 1 and compressed to create a multiple signal (TCM). No document describes the case where the same signal can be transmitted a plurality of times and a transmission diversity effect is obtained by making the compression rate larger than the signal compression rate.

[0010]

A radio base station and a large number of mobile radio units facing each other establish a radio line, and, for example,
When communication is performed using a TCM-converted telephone signal, in order to improve the quality of the transmitted signal, for example, when transmission diversity (assuming that the number of multiplexing is 2) is performed by a conventional method, the required transmission is performed as follows. Electricity will be doubled. That is, with frequency diversity, the frequency to be used is doubled, and each frequency is transmitted twice using the same transmission power as before. Also, with time diversity (assuming that the number of multiplexing is 2), the frequency used is the same as before, but the time required for transmission is doubled, which means that the same transmission power as before is transmitted twice. There was a problem to be solved that they would be the same.

[0011]

On the other hand, in the modulation method according to the present invention, when a time-divided signal is compressed to create a multiple signal (TCM conversion), the compression ratio required is higher than that required by the system. By increasing (for example, k × n times), the multiplex number is increased, and the multiplex load gain of the TCM signal is increased from the conventional value (it depends on the multiplex number but becomes at least 3 dB), and the transmission power is increased by that amount. It is configured so that the same signal can be transmitted a plurality of times to obtain a transmission diversity effect. The system configuration will be described.

When the transmission signal (baseband signal) is divided into predetermined time interval units and stored in the storage circuit and is read out, the minimum high-speed reading speed required for the system is n times as high. At this time, the signal is converted into a pulse-shaped time series by a predetermined time slot series at a high speed of k × n times (k is usually an integer of 2 or more). Then, the signal accommodated in this time slot sequence is angle-modulated or amplitude-modulated on the carrier wave, and is embedded in the mobile radio device and the radio base station for intermittently transmitting and receiving in time. A radio receiving circuit having a receiving mixer that communicates, a radio transmitting circuit having a transmitting mixer, a synthesizer applied to the receiving mixer of the radio receiving circuit, and a switch circuit provided to the synthesizer applying to the transmitting mixer of the radio transmitting circuit, respectively applied. The output of the synthesizer is interrupted, this interrupted state is synchronized for both transmission and reception, and a method for synchronizing the intermittent transmission and reception similar to the above with that of the mobile radio is also used for the radio base station communicating oppositely, and at the receiving side, In order to extract only the signal accommodated in a given time slot, the radio receiving circuit is opened and closed to receive and demodulate. The obtained signal is stored in the memory circuit, and when it is read out, the baseband signal, which is the transmitted original signal, is reproduced by reading it at a low speed of 1 / k × n of the speed stored in this memory circuit. Enable and
In addition, we constructed a system that includes a wireless base station for mobile communication and a mobile wireless device that can transmit and receive the same call signal using a plurality of time slot sequences.

[0013]

In order to allow a large number of mobile radios to exist in the radio base station and its service area and to communicate with the radio base station by any number of mobile radios, one radio channel is temporally arranged. It is divided into a plurality of time slot series, and one of these time slot series is selected and communication is performed using this. If one mobile radio is communicating with a radio base station and another mobile radio transmits to this radio base station, the radio channel that is already in use for the mobile radio that newly wishes to communicate. In this case, by giving an unused one of the time slot sequences to enable communication with the radio base station, many communications do not interfere with each other, and The communication can be executed without being adversely affected.

Further, when communication or communication traffic requiring good communication quality is low, a plurality of time slot sequences obtained by increasing the signal compression rate are selected. , It is possible to improve communication quality by diversity transmission and reception. In this case, the same communication signal is transmitted from the wireless base station to multiple time slot sequences in the same wireless channel, this is received by the mobile wireless device, and both are mixed by the telephone (terminal unit) input. ,
In addition, the transmission signal from the mobile radio is transmitted in multiple time slot sequences, and the radio base station receives and mixes the signals to enable diversity transmission and reception.

As a result, the transmission power can be reduced by utilizing the multiple load gain, the transmission diversity effect can be obtained, and the system with high line quality and high effective utilization of frequency can be realized. Became.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 shows a system configuration for explaining the concept of the present invention. In FIG. 1, 10 is a general telephone network, and 20 is a gateway switch for switching and connecting the telephone network 10 and a wireless system. Reference numeral 30 denotes a wireless base station, which has an interface with the gateway switch 20, a circuit for converting the speed of signals, a circuit for allocating and selecting time slots, a control unit, etc. for setting and releasing a wireless line. , And a mobile transceiver 100 (100-1 to 100-n) and a radio transceiver circuit for exchanging radio signals. Here, between the gateway exchange 20 and the wireless base station 30, there are transmission lines for transmitting the communication signals 22-1 to 22-n including the communication signals of the communication channels CH1 to CHn and the control signals.

FIG. 2 illustrates the principle of the present invention.
The circuit configuration of the mobile wireless device 100 that communicates with the wireless base station 30 is shown. A received signal such as a control signal or a call signal received by the antenna unit enters a wireless reception circuit 135 including a reception mixer 136 and a reception unit 137, and a communication signal output from the reception signal is two speed restoration circuits 138-1 and 138.
8-2, the control unit 140, and the clock regenerator 141. The clock regenerator 141 regenerates a clock from the received signal and restores it to the speed restoration circuit 138-
1, 138-2, control unit 140, and timing generator 14
2 is applied.

The speed restoring circuits 138-1 and 138-2 restore the speed (pitch in the case of analog signal) of the compressed and delimited communication signal in the received signal, and the signal mixing circuit 152 as a continuous signal. After being mixed in, they are input to the telephone unit 101 and the control unit 140.

The communication signal output from the telephone unit 101 is divided by the signal division circuit 139, and then divided by the two speed conversion circuits 131-1 and 131-2 at a predetermined time interval to determine the speed. (Pitch in the case of analog signal) is compressed (compressed) at high speed and applied to the wireless transmission circuit 132 including the transmission mixer 133 and the transmission unit 134. The transmission signal is transmitted from the antenna unit and is transmitted by the wireless base station 30. Be received.

The timing generator 142 uses the clock from the clock regenerator 141 and the control signal from the controller 140 to transmit / receive the interrupt controller 123 and the speed conversion circuit 13.
The necessary timings are supplied to the 1-1, 131-2, the wireless reception circuit 135, and the speed restoration circuits 138-1, 138-2. The clock from the clock generator 141 is also applied to the speed conversion circuits 131-1 and 131-2.

The mobile radio 100 further includes synthesizers 121-1 and 121-2 and a changeover switch 122.
-1, 122-2 and changeover switches 122-1 and 122
-2 includes a transmission / reception gating controller 123 and a timing generator 142 that generate signals for switching each of -2, and the synthesizers 121-1 and 121-2, the transmission / reception gating controller 123, and the timing generator 142 are control units. It is controlled by 140. Each synthesizer 121
The reference frequency is supplied to the -1, 121-2 from the reference crystal oscillator 120.

The ID information storage unit 182 is used for the radio base station 30.
The identification information (ID) transmitted from the signal mixing circuit 1
Upon receiving from 52, it is collated with the stored content under the control of the control unit 140 and stored as necessary.

FIG. 3 shows a radio base station 30 for explaining the principle of the present invention. The n-channel communication signals 22-1 to 22-n with the gateway switch 20 are connected to a signal processing unit 31 that forms an interface on a transmission path.

The communication signals 22-1 to 22-n sent from the gateway switch 20 are input to the signal processing section 31 of the radio base station 30. The signal processing unit 31 is provided with an amplifier for compensating for transmission loss, and also performs so-called 2-wire-4 wire conversion. That is, the input signal and the output signal are mixed and separated, and the input signal from the gateway switch 20 includes many switches SWR-1-1 and SWR-1-2.
..., SWR-1-n, SWR-2-1, SWR-2-
2, ..., SWR-2-n, ..., ..., SWR-n-1, S
WR-n-2, ..., SWR-n-n, and SWT-1
-1, SWT-1-2, ..., SWT-1-n, SWT-
2-1, SWT-2-2, ..., SWT-2-n, ...,
..., SWT-n-1, SWT-n-2, ..., SWT-n
It is sent to the signal speed conversion circuit group 51 via the switch group 83 including -n.

The output signal from the signal speed restoration circuit group 38 is transmitted to the gateway exchange 20 in the signal processing unit 31 using the same transmission line as the input signal. Here, switch group 8
3 is a switch for transmission SWT1-1 to SWT-n-n
And receiving switches SWR-1-1 to SWT-n-n
Each of them operates under the control of the communication path control unit 81, opens and closes the switch group 83 so as to achieve a desired purpose, and operates to enable transmission and reception diversity.

The ID identification storage section 82 is used to identify and store the ID of the mobile radio 100. Further, the call path controller 81 opens and closes the switch group 83 according to a command from the controller 40 to control the call path.
1 also has a function of providing information and requesting control to the control unit 40.

Of the above, the input signal from the gateway switch 20 passes through the switch group 83, and then is input to the signal speed conversion circuit group 51 including many signal speed conversion circuits 51-1 to 51-n, and is input for a predetermined time. Divide by intervals and undergo velocity (pitch) conversion. As for the signal transmitted from the wireless base station 30 to the gateway switch 20, the output of the wireless reception circuit 35 is input to the signal speed restoration circuit group 38 via the signal selection circuit group 39, and the speed (pitch) is converted. After that, it is input to the signal processing unit 31 through the switch group 83.

The control of the radio receiving circuit 35 or the output of a call signal includes a signal selection circuit group 3 including signal selection circuits 39-1 to 39-n for selecting a signal for each time slot.
9, and the call signals are separated corresponding to each of the call channels CH1 to CHn. This output is subjected to the restoration of the signal speed (pitch) by the signal speed restoration circuit group 38 including the signal speed restoration circuits 38-1 to 38-n provided for each channel, and then, through the switch group 83, After being input to the signal processing unit 31 and undergoing 4-line to 2-line conversion, this output is sent to the gateway exchange 20 as communication signals 22-1 to 22-n.

Next, the function of the signal speed conversion circuit group 51 will be described. The input signal such as a voice signal or a control signal, which is divided into a certain time length, is stored in a storage circuit, and the speed is changed when reading the input signal, and the read signal is read at a speed of, for example, 15 times that of the storage time. Can be compressed. The principle of the signal speed conversion circuit group 51 is tape
This is the same as playing back the sound recorded by the recorder at high speed. In practice, for example, CCD (Charge Coupl
ed Device) and BBD (Bucket Brigade Device) can be used, and the memory used in a television receiver or a tape recorder for compressing or expanding the time axis of conversation can be used (reference: Kosaka et al. "Tape recorder that compresses / expands the time axis of conversation" Nikkei Electronics July 26, 1976 92-1
33).

CCD exemplified by the signal speed conversion circuit group 51
The circuit using the BBD or BBD can be used as it is for the signal speed restoration circuit group 38 as described in the above document. In this case, the clock from the clock generator 41 and the control signal from the control unit 40 are used. By receiving the timing signal from the timing generator 42 that generates the timing, the read speed is set lower than the write speed.

The control or voice signal output from the gateway switch 20 via the signal processing unit 31 is input to the signal speed conversion circuit group 51, and the speed (pitch) conversion processing is performed, and then the time slot. It is applied to the signal allocation circuit group 52 which allocates signals separately.

The signal allocating circuit group 52 is a buffer memory circuit, which memorizes the high-speed signals for one segment outputted from the signal speed converting circuit group 51, and outputs from the timing generating circuit 42 given by the instruction of the control section 40. The signal in the buffer memory is read out with the timing information of 1 and sent to the wireless transmission circuit 32. As a result, when the communication signals are viewed as channels, they are arranged in series without overlap in time series, and when all the communication signals or control signals described later are implemented, it is as if they were continuous signal waves. become.

The above signals are sent to the wireless transmission circuit 32. The state of this compressed signal will be described with reference to FIG.

The output signal of the signal speed conversion circuit group 51 is input to the signal allocation circuit group 52, and time slots are given in a predetermined order. SD in Figure 4 (a)
, SD2, ..., SDn indicate that the speed-converted communication signals are assigned to each time slot.

In FIG. 2A, when the communication between the radio base station 30 and the mobile radio 100 includes the communication to which the transmission diversity is applied and the communication to which the transmission diversity is not applied, the following occurs. Time slot allocation is done. n
Is a multiple of 3 and n = 3 m. Mobile radio 1 above
00-1, 100-2, ..., 100-2m are executing diversity transmission / reception (duplex) with the radio base station 30,
The assigned time slots are, for example, time slots SD1, SD2, ..., SDm, in one frame.
SDm + 1, SDm + 2, ..., SD2m, SD2m +
1, SD2m + 2, ..., SD3m among SD1 and SD
m + 1, SD2 and SDm + 2, SDm and SD2m, respectively. In addition, mobile radios 100-2m + 1, 1
00-2m + 2, ..., 100-3m are performing non-diversity transmission / reception, and the allocated time slots are SD2m + 1, SD2m + 2, ..., SD3m.
Is.

Here, in one time slot, a synchronizing signal and a call signal or / and a control signal are accommodated as shown in the figure. When the call signal is not installed, an empty slot signal is added to the call signal portion only by the synchronization signal added by the call path control unit 81. Alternatively, there is a system in which no signal including a carrier wave is transmitted. In this way, as shown in FIG. 4A, in the wireless transmission circuit 32, 1 is set in the time slots SD1 to SDn.
The signals that make up the frame will be applied to the modulator circuit. The time-series multiplexed signal to be transmitted is amplitude- or angle-modulated in the wireless transmission circuit 32, and then transmitted to the space from the antenna unit.

Regarding the transmission of the control signal between the radio base station 30 and the mobile radio 100 prior to the telephone call when making or receiving a telephone call, regardless of whether the telephone signal is in the band or out of the band. It is possible. FIG. 5 shows these frequency relationships. That is, in the figure (a), the out-of-band signal is illustrated, and 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 (for example, when applying diversity).

These control signals are generated by the control unit 40, and are also generated and transmitted by relaying or exchanging the control signal from the gateway switch 20 and the control signal from the communication path control unit 81 in the control unit 40. It Mobile radio 10
The control signal sent from 0 is received by the wireless reception circuit 35, processed by the control unit 40, and sent to the communication path control unit 81 and the gateway switch 20 as necessary.

FIG. 5B shows an example of the in-band signal, which is used at the time of making and receiving calls. In the above examples, tone signals are used. However, by increasing the number of tone signals or modulating the tones to form subcarrier signals, it is possible to transmit various types of signals at high speed.

Although the above is the case of the analog signal, when the digital data signal is used as the control signal, it is also possible to digitally encode the voice signal and time-division multiplex both of them for transmission. A circuit configuration in this case is shown in FIG. FIG. 6 shows an example in which the voice signal is digitized by the digital encoding circuit 91, the data signal and the data signal are multiplex-converted by the multiplex conversion circuit 92, and applied to the modulation circuit included in the wireless transmission circuit 32. However, for digital data signals, the analog signal multiple load gain, which will be described later, does not normally exist, so this point must be noted in the system design. It is possible to separately extract the voice signal and the control signal by performing the operation opposite to that shown in FIG. 6 in the demodulation circuit, which is received by the opposite receiver.

On the other hand, the signal sent from the mobile radio 100 is received by the antenna section of the radio base station 30 and input to the radio receiving circuit 35. FIG. 4B schematically shows this upstream input signal. That is, the time slots SU1, SU2, ..., SUn represent transmission signals addressed to the radio base station 30 from the mobile radios 100-1, 100-2, ..., 100-n.

In FIG. 4B, when the communication between the radio base station 30 and the mobile radio 100 includes the communication to which the transmission diversity is applied and the communication to which the transmission diversity is not applied, the following occurs. Time slot allocation is done. n
Is a multiple of 3 and n = 3 m. Mobile radio 1 above
00-1, 100-2, ..., 100-2m are executing diversity transmission / reception (duplex) with the radio base station 30,
The assigned time slots are, for example, time slots SU1, SU2, ..., SU in one frame.
m, SUm + 1, SUm + 2, ..., SU2m, SU2m
, SU3m among +1, SU2m + 2, ..., SU3m
Um + 1, SU2 and SUm + 2, SUm and SU2m, respectively. Also, the mobile radio 100-2m + 1,
, 100-3m are performing non-diversity transmission / reception, and the allocated time slots are SU2m + 1, SU2m + 2, ..., SU3m.

Also, each time slot SU1, SU2,
, SUn in detail, as shown in the lower left part of FIG. 4B, it is composed of a call signal and / or a control signal. However, when the distance between the mobile wireless device 100 and the wireless base station 30 is small or depending on the signal speed,
It is possible to omit the synchronization signal. Furthermore, FIG.
The waveform of the wireless carrier of the upstream wireless signal in (b) in a time slot is schematically shown in FIG. 7 (c). Similarly, the downlink transmission waveform from the wireless base station 30 to each mobile wireless device 100 in FIG. 4A is as shown in FIG. 7D.

Now, the control signal of the input signals arriving at the radio base station 30 is immediately added from the radio receiving circuit 35 to the control unit 40. However, depending on the size of the speed conversion rate, it is possible to add the signal from the output of the signal speed restoration circuit group 38 to the control unit 40 after performing the same processing as the call signal. 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 according to an instruction of a control signal from the control unit 40, and a synchronization signal and a call are generated for each of the time slots SU1 to SUn. The signal or control signal is output separately.

Each of these signals is sent to the signal speed restoration circuit 38.
Is input to. This circuit has a function of performing inverse conversion of the speed conversion circuit 131 (FIG. 2) in the mobile radio device 100 on the transmission side, whereby the original signal is faithfully reproduced and transmitted to the gateway exchange 20. Become.

The mode of transmitting the signal space according to the present invention will be described below with reference to the required transmission band and the relationship with the adjacent radio channel.

As shown in FIG. 3, the control signal from the control unit 40 is applied to the radio transmission circuit 32 in parallel with the output of the signal allocation circuit 52. However, it is possible to add the signal from the output of the signal allocation circuit group 52 to the wireless transmission circuit 32 after performing the same processing as the call signal depending on the magnitude of the speed conversion rate. Next, also in the mobile wireless device 100, as shown in FIG. 2, of the functions of the wireless base station 30, the circuit configuration is required when the communication channel is one channel.

Original signal, for example voice signal (0.3 kHz
~ 3.0 kHz) is the signal speed conversion circuit group 51 (Fig. 3)
The frequency distribution on the output side when passing through is as shown in FIG. That is, as described above, the audio signal is 60
If it is doubled, the frequency distribution of the signal is expanded to 18 kHz to 80 kHz as shown in FIG.

FIG. 8 shows a case where the control signal is simultaneously transmitted using the lower frequency band of the audio signal. Of this signal, the control signal (1-16 kHz) and the speech signal CH1 (represented as SD1 at 18-180 kHz) are time slots, eg SD1.
It is supposed to be housed in. Other time slot SD1
The same applies to audio signals accommodated in 2 to SDn.

That is, the time slot SDi (i =
1, 2, 3, ..., N) is a control signal (1 to 16 kHz)
And communication signal CHi (i = 1, 2, 3, ..., N, 18 to 1)
80 kHz). However, the signals in each time slot are arranged in time series, and the signals in a plurality of time slots are simultaneously transmitted to the wireless transmission circuit 3 at the same time.
It is never added to 2.

When these call signals are applied to the angle modulator included in the radio transmission circuit 32 together with the control signal, the required transmission band is at least f _C ± 180 kHz.
Need. However, f _C is a radio carrier frequency. If there are a plurality of wireless channels given to the system, the speedup of signals by the signal speed conversion circuit group 51 is limited to a certain value due to the limitation of these frequency intervals. F is the frequency interval of a plurality of wireless channels
Let _rep be the maximum signal speed f _H due to the speedup of the audio signal described above, and the following inequality must be established between the two. f _rep > 2f _H On the other hand, in the case of a digital signal, the voice is usually digitized at a speed of about 64 kb / s. Therefore, it is necessary to read the scale of the horizontal axis in FIG. However, the relation of the above equation holds in this case as well.

In addition, from the mobile radio 100 to the radio base station 3
The control signal input to 0 is input to the wireless reception circuit 35, part of its output is input to the control unit 40, and the other is sent to the signal speed restoration circuit group 38 via the signal selection circuit 39. .. The latter control signal undergoes speed conversion (conversion to a low speed signal) completely opposite to that at the time of transmission, and then the general telephone network 10
The signal speed is the same as that used in the above, and it is sent to the gateway exchange 20 via the signal processing unit 31.

In the following, when a system is constructed by using a TCM telephone signal having a frame length of T, a maximum frequency of the signal of f _h , and a multiplexing number of n, the required (minimum) time of the telephone signal required by the system The compression ratio and the multiple load gain of the TCM telephone signal will be described with reference to Reference 3. First, the required time compression ratio of the telephone signal is obviously 1 / n since the number of multiplexing is n. Because, if the compression rate is less than this, the signal will be accumulated at the transmitting end, and the signal cannot be transmitted satisfactorily. The multiple load gain is then equal to that of an FDM (frequency division multiplex) telephone signal of multiplicity n'given by n '= n / (2f _h T) (1)

As a concrete numerical value, the frame length T is 1
The required (minimum) time compression rate of the TCM signal having m sec, the maximum frequency f _{h of the} signal is 3 kHz, and the number of multiplexing n corresponding to the telephone channel is 30 is 1/30, and the multiple load gain is obtained. Substituting into equation (1), we obtain n '= 5. Therefore, the multiple load gain is 10 dB from the reference 3 (system 1). Next, the number of time slots in the frame is increased without changing the frame length T, the maximum frequency of the signal f _h , the number of multiplexed channels corresponding to telephone channels n = 30, and the like.
This can be achieved by increasing the time compression rate of the TCM telephone signal. That is, the required (minimum) time compression rate of the telephone signal (time piece signal) required for the system is 1 /
30 is enough, but 1/40, 1/50, 1 /
By increasing the number in the order of 60, ..., The time width of the time slot decreases, and it is possible to equivalently increase the time slot. This enables diversity transmission.

Explaining in FIG. 4 (a) with n = 3 m,
SD1 to SDm, SDm + 1 to SD2m (m = 10,
(n = 30) time slots for diversity transmission (SD1 and SDm + 1 are used for the same telephone signal)
SD2m + 1 to SD3m correspond to the case of using for non-diversity transmission. However, the time
Ignore the guard time set between slots. In this case (system 2), the multiple load gain is obtained. Since n = 50 can be set in the equation (1), n ′ = 8.
Get three. Therefore, the multiple load gain is 13 from Document 3.
Get dB. That is, the multiple load gain is 10 dB to 1
This means an increase of 3 dB to 3 dB. If this increase is used to reduce wireless transmit power, the transmit power may be reduced by 3 dB over conventional systems.

Further, the required (minimum) time compression rate of the telephone signal (time piece signal) is increased without changing the number of frames n, where the frame length is T, and the maximum frequency of the signal is f _h telephone channel compatible n = 30. Then, the number of time slots in the frame is increased to 60. That is, if the diversity transmission is applied to all transmissions from the radio base station 30, the multiple load gain may be 14 dB from the reference 3 and the transmission power may be reduced by 4 dB. The following results are summarized in Figure 9. From FIG. 9, under the above conditions, as the number of time slots increases, the multiple load gain increases, and if this increase is used to reduce the radio transmission power, the effect is to increase the number of time slots. You can see that the more you do it, the bigger it becomes.

However, it should be noted that under the above conditions, as the number of time slots increases, T increases.
The highest frequency that a signal converted into CM has is to be high. That is, as shown in FIG. 9, the maximum frequency of the TCM signal in the system 2 is about 1.6 times higher than that in the system 1, and the maximum frequency in the system 3 is twice higher than that in the system 1. In the operation of the system, it is necessary to widen the interval between adjacent wireless carriers by the amount that the exclusive frequency bandwidth of the wireless signal is increased. That is, the effective utilization rate of the frequency decreases. However, this decrease in the effective utilization rate naturally occurs in other transmission diversity, and the method according to the present invention is not inferior to the other methods.

Next, the application of call origination / termination operation and transmission / reception diversity of the system according to the present invention will be described by taking the case of a voice signal as an example.

(1) Calling from the mobile radio device 100 Calling operation to which transmission / reception diversity is not applied will be described with reference to the flowcharts shown in FIGS.

When the mobile radio 100 is turned on, the radio reception circuit 135 of FIG. 2 includes the downlink (radio base station 30 → mobile radio 100) radio channel (referred to as channel CH1). Start capturing control signals. If the system is provided with multiple radio channels, i) the radio channel showing the maximum received input field ii) the radio channel indicated by the control signals contained in the radio channel iii) Within the radio channel , The wireless channel (hereinafter referred to as channel CH1) is being received according to the procedure defined in the system, such as the channel having an empty time slot. This is the time shown in Fig. 4 (a).
This is possible by capturing the synchronization signal in the slot SDi. The control unit 140 sends a control signal to the synthesizer 121-1 so as to generate a local oscillation frequency that enables reception of the radio channel CH1, and also switches 12
2-1 is also in a state of being tilted and fixed to the synthesizer 121-1 side.

Therefore, the telephone of the telephone unit 101 is turned off.
When a hook (call origination) is made (S201, FIG. 10), FIG.
The synthesizer 121-2 of receives the control signal from the control unit 140 so as to generate the local oscillation frequency that enables the transmission of the radio channel CH1. Further, the switch 122-2 is also tilted to the synthesizer 121-2 side to be in a fixed state. Next, the call control signal output from the telephone unit 101 is transmitted using the radio channel CH1. This control signal is transmitted by the frequency band shown in FIG. 8 using, for example, the time slot SUn.

This control signal is transmitted in the time slot S
It is limited to only Un and is sent in bursts and no signal is sent in other time zones, so that it does not adversely affect other communications. However, if the speed of the control signal is relatively low, or if the amount of information in the signal is large and cannot be accommodated in one time slot, the same time of one frame later or the next frame Sent using slots.

To capture the time slot SUn,
Specifically, the following method is used. As shown in FIG. 4A, the control signal transmitted from the radio base station 30 includes a synchronization signal and a control signal following the synchronization signal, and the mobile radio 100 receives the frame synchronization signal. Will be possible. Further, the control signal includes control information such as a currently used time slot and an unused time slot (empty time slot display). Depending on the system, the time slot SDi (i = 1,
2, ..., N) may contain only a sync signal and a call signal when they are used by other communication, but even in such a case, an unused time slot usually has a sync signal and a control signal. A signal is included, and by receiving this control signal, it is possible to know which time slot the mobile radio device 100 should use to send the calling signal.

When all the time slots are in use, it is impossible to make a call on this radio channel and it is necessary to sweep and search another radio channel.
In another system, there is a case where an empty slot is not displayed in any time slot, and at this time, the following audio multiplexed signals SD1, SD2, ..., SD
It is necessary to search for the presence of n one after another to check for empty time slots.

Returning to the present discussion, the mobile radio 100, which has received the control information sent from the radio base station 30 by any of the above methods, sends out a call control signal at which time slot. Whether or not it should be possible can be determined by including the transmission timing. Therefore, assuming that the uplink signal time slot SUn is an empty slot, this empty time slot is used, and a call control signal is transmitted to extract the required timing from the response signal from the radio base station 30. As a result, a burst control signal can be transmitted.

If there is a call from another mobile radio at the same time, the call signal is not properly transmitted to the radio base station 30 due to a collision of calls, and it is necessary to restart the operation from the beginning. However, this probability is suppressed to a sufficiently small value when viewed as a system. If it is desired to reduce call collisions further, the following measures are taken. If mobile radio 100 finds an empty time slot that it can make a call, it does not use all of that time slot, but only the first half for some mobile radios and only the second half for some mobile radios. This is the method to use. That is, as a calling signal, the used portion of the time slot is divided into several types, and using this, a large number of mobile radio devices are grouped, and each group is assigned a time zone within that one time slot. How to give. Another method is to create various types of frequencies that the control signal has, and to assign this frequency to each group by grouping a large number of mobile radio devices. According to this method, even if control signals having different frequencies are simultaneously transmitted using the same time slot, interference does not occur in the radio base station 30. The above two methods may be used separately, or if they are used together, the effect is synergistically increased.

Now, the call control signal from the mobile radio device 100 is properly received by the radio base station 30 and the mobile radio device 100 is received.
If the ID (identification number) is detected (S202),
The control unit 40 searches for a currently empty time slot. The time slot given to the mobile radio 100 may be SUn, but a search is performed just in case. This is because, in addition to the mobile wireless device 100, it is possible to handle simultaneous calls from other mobile wireless devices and to provide time slots suitable for the service type and service classification.

As a result, for example, time slot SD
1 is available, the time slot SDn of the radio channel CH1 is used for the mobile radio device 100 and the time slot ascending (the mobile radio device 10) by the downlink control signal.
0 → Radio base station 30) SU1, and the corresponding downlink (radio base station 30 → mobile radio 100) SD1 is instructed to be used (S203). In response to this, the mobile radio 100 shifts to a state in which it can be received in the instructed time slot SD1 and the time for the uplink radio channel corresponding to the downlink time slot SD1.
The slot SU1 (see FIG. 4B) is selected.
At this time, in the control unit 140 of the mobile wireless device 100,
The transmission / reception gating controller 123 is operated and the switch 122-
The operation of 1 and 122-2 is started (S204). At the same time, a slot switching completion report is sent to the radio base station 30 using the uplink time slot SU1 (S20
5) Wait for dial tone (S2)
06).

The time of the wireless carrier of this upstream wireless signal
The state of the slot SU1 is shown in FIG. 7 (c). In addition to the time slot SU1, the radio base station 30 receives SU as an uplink signal from another mobile radio 100.
3 and SUn are sent in one frame. In the wireless base station 30 that has received the slot switching completion report (S207), the mobile wireless device 100 is addressed to the gateway switch 20.
The calling signal is sent out together with the ID of (S208). On the other hand, the gateway exchange 20 detects the ID of the mobile wireless device 100, turns on a necessary switch in the switch group included in the gateway exchange 20 (S209), and dials
The tone is transmitted to the radio base station 30 (S210, FIG. 1).
1). This dial tone is transferred to the mobile wireless device 100 by the wireless base station 30 (S211), and the mobile wireless device 100 confirms that the communication path has been set (S2).
212).

When this state is entered, the mobile wireless device 100
Since a dial tone is heard from the handset of the telephone section 101, the transmission of the dial signal is started. This dial signal is subjected to speed conversion by the speed conversion circuit 131, and the wireless transmission circuit 13 including the transmission unit 134 and the transmission mixer 133.
From 2, the data is transmitted using the upstream time slot SU1 (S213). Thus, the transmitted dial signal is received by the wireless reception circuit 35 of the wireless base station 30.

The radio base station 30 has already responded to the calling signal from the mobile radio 100, and has set the time
The slot is given, and the signal selection circuit group 39 and the signal allocation circuit group 52 of the radio base station 30 are operated to receive the uplink time slot SU1 and to transmit the downlink time slot SU1.
The state has shifted to transmitting the signal of the slot SD1.
In addition, the communication path control unit 81 uses the signal from the control unit 40 to receive the switch SWR-1 of the switch group 83.
-1, and the switch SWT-1-1 for transmission is set to the on state (black triangle in FIG. 3). Therefore, the dial signal transmitted from the mobile wireless device 100 passes through the signal selection circuit 39-1 of the signal selection circuit group 39, and then is input to the signal speed restoration circuit group 38, where the original transmission signal is restored, The signal processing unit 3 is further connected via the switch group 83.
A call signal 22-1 is transferred to the gateway exchange 20 via S1 (S214), and a call path to the telephone network 10 is set (S215).

On the other hand, the input signal (initial control signal, call signal if a call is started) from the gateway switch 20 is the switch SWT-1 of the switch group 83 in the radio base station 30.
After passing -1, the signal speed conversion circuit group 51 receives the speed conversion, and the signal allocation circuit 52-1 of the signal allocation circuit group 52 gives the time slot SD1. Then, the data is transmitted from the wireless transmission circuit 32 to the mobile wireless device 100 using the time slot SD1 of the downstream wireless channel. The state of the time slot SD1 of the downlink radio carrier is shown in FIG. 7 (d).

In the mobile radio 100, the radio channel CH
In the time slot SD1 of No. 1, the reception is awaited, and it is received by the radio reception circuit 135, and its output is input to the speed restoration circuit 138. The original signal on the transmission side is restored in this circuit, and the telephone unit 1 is transmitted via the signal mixing circuit 152.
01 is input to the handset. Thus, the mobile radio 10
A call is started between 0 and the ordinary telephone in the ordinary telephone network 10 (S216).

The end of the call is the telephone section 101 of the mobile radio 100.
By hooking the handset of the mobile phone (S217),
The end signal and the on-hook signal from the control unit 140
The signal is transmitted from the wireless transmission circuit 132 to the wireless base station 30 via the speed conversion circuit 131 (S218), the control unit 140 stops the operation of the transmission / reception interrupt controller 123, and the switches 122-1 and 122- 2 is fixed to the output terminals of the synthesizers 121-1 and 121-2, respectively.

On the other hand, in the control unit 40 of the radio base station 30,
When the call end signal from the mobile wireless device 100 is received, the call end signal is transferred to the gateway switch 20 (S219), the switches SWR-1-1 and SWT-1-1 of the switch group 83 are turned off, and the call ends. Yes (S220). Radio base station 3 at the same time
The signal selection circuit group 39 and the signal allocation circuit group 52 in 0 are opened.

In the above description, the control signals are exchanged between the radio base station 30 and the mobile radio 100 without passing through the signal conversion circuit group 51, the signal speed restoration circuit group 38, etc., but this is explained. For the sake of convenience, the signal speed conversion circuit group 51 and the signal speed restoration circuit group 38 are the same as those for the audio signal.
Communication can be performed without any trouble through the signal processing unit 31 and the signal processing unit 31.

(2) Incoming Call to Mobile Radio 100 Next, an incoming call operation to the mobile radio 100 will be described. The mobile wireless device 100 is in a standby state with the power turned on. In this case, as described in the calling operation from the mobile radio 100, the downlink control signal of the radio channel CH1 according to the procedure defined by the system is in the standby state.

An incoming call signal from the general telephone network 10 to the mobile radio 100 via the gateway switch 20 is transmitted to the radio base station 30.
Suppose you have arrived. Similar to the voice signal, these control signals pass through the signal speed conversion circuit group 51, and are transmitted to the control unit 40 (FIG. 3) through the signal allocation circuit group 52, similarly to the voice signal. Then, the control unit 40 instructs the communication path control unit 81 to confirm the switches that can be used as the transmission and reception switches SW of the switch group 83 and to keep the switches in the ON state. At the same time, using an empty slot, for example, SD1, of the downlink time slots of the radio channel CH1 addressed to the mobile radio device 100, the ID signal of the mobile radio device 100 + the incoming signal indication signal + the time slot is used. A signal (for transmission from the mobile wireless device 100, for example, SU1 corresponding to SD1 is used) is transmitted. In the mobile wireless device 100 that receives this signal, the signal is transmitted from the receiving unit 137 of the wireless receiving circuit 135 to the control unit 140. The control unit 140 confirms that this signal is an incoming call signal to the mobile wireless device 100 of its own, so that the telephone unit 101 sounds a ringing tone and at the same time waits at the instructed time slot SD1, SU1. The transmission / reception interrupt controller 123 is operated as described above, and the switch 1
22-1 and 122-2 are turned on and off. Thus, the call is ready to be made.

Similarly, if there is an outgoing (incoming) call from another mobile radio, a control or call signal is sent to the radio base station 30 by using another time slot of the same radio channel as an uplink radio signal. To be done.

(3) Application of Transmission / Reception Diversity By the process described in the above (1) and (2), an outgoing / incoming call can be made between the wireless base station 30 and the mobile wireless device 100. A method for further applying the transmission / reception diversity in the executed state will be described with reference to the flowcharts shown in FIGS. 12 and 13. The purpose of applying transmission / reception diversity is to improve the quality of communication, and to provide high-quality services to important subscribers (VIPs) or when communication time slots are available during times of traffic congestion. Done.

First, the mobile wireless device 100 described in section (1).
There is a call from, the down time slot SD1 and the up time slot SU1 are used, and the switches SWR-1-1 and SWT-1-1 of the switch group 83 are turned on,
The mobile wireless device 100 includes a wireless base station 30 and a gateway switchboard 2.
A telephone call is being made (communication) with the telephone network 10 via 0 (S25).
1, FIG. 12). The control unit 140 of the mobile wireless device 100, which is already in a call, determines the application of diversity (S
252), search for an empty time slot on the same radio channel is started (S253). Therefore, the operations of the speed restoration circuit 138-2 and the speed conversion circuit 131-2 are started, the timing signal of the timing generator 142 is changed, and the time slot other than the time slot currently used for the transmission / reception is also transmitted / received. Move to a possible state. That is, the gating method of the transmission / reception gating controller 123 is changed by the timing signal generated by the timing generator 142, and the other time slots SD2, SD3, ..., SDn are output as the output of the speed restoration circuit 138-2.
Signals are sequentially taken out to search for an empty time slot (S254 NO, S253), and if there is an empty time slot, the use of that time slot is considered (S254). As a result, for example, when it is found that the downlink time slot SD2 is empty (254YE
S), inserting a control signal in the currently communicating upstream time slot SU1 in a manner that does not affect communication, and sending a signal requesting the use of time slots SD2, SU2 to the radio base station 30 ( S255, FIG. 13).

This signal is received by the radio receiving circuit 35 of the radio base station 30 and transmitted to the control section 40 (S25).
6). As a result of the investigation, the control unit 40 finds that the time slot S
When it is confirmed that D2 and SU2 are unused, and preparations are made for their use (S256), the downlink time currently in use
The slot SD1 is used to insert a control signal in a form that does not affect communication, and transmits a notification that the desired time slot SU2 is available to the radio base station 30 (S2).
57). At the same time, the signal selection circuit 39-2 in the signal selection circuit group 39 of the radio base station 30 and the signal speed restoration circuit 38-2 in the signal speed restoration circuit group 38 are put in the standby state, and Signal allocation circuit 52-2 and signal speed conversion circuit 51-2 in signal speed conversion circuit group 51
Similarly shifts to the standby state.

Upon receiving the report signal from the radio base station 30, the mobile radio device 100 changes the timing signal of the timing generator 142 so that the time slots SD1 and SD2 can be received and the transmission can be performed. Telephone unit 1 using time slots SU1 and SU2
01 output from the signal division circuit 139 and the speed conversion circuit 1
The state is changed to the state of transmitting to the wireless transmission circuit 132 via 31-1 and 131-2 (S259).

On the other hand, in the radio base station 30, the mobile radio 10
From 0, the signals transmitted using the time slots SU1 and SU2 are received, and the mobile radio 100
Since it is confirmed that the signal is the signal (S260), the call path control unit 81 switches the switch SWR-1- of the switch group 83.
1, SWT-1-1 is in the ON state, and further SWR-2-1 and SWT-2-1 are turned on (black 3 in FIG. 3).
Then, the call is continued (S261). Subsequent calls use two time slots each for transmission and reception, and the communication quality is improved by the effect of transmission / reception diversity (time diversity in this case).

In the above description, the case where the initiative at the time of applying diversity is given to the mobile radio device 100 side,
The same can be done when the wireless base station 30 is given the initiative.

Further, the method of applying the transmission / reception diversity after the incoming / outgoing call is started as described above is not
It is possible to apply diversity from the beginning,
This will be described below.

Taking the case of making a call from the mobile radio 100 as an example, the uplink control signal at the time of calling is sent to the time slot SU.
When transmitting to the wireless base station 30 using n, the control signal includes a signal indicating that diversity is desired to be applied.
On the other hand, to the downlink channel from the radio base station 30, a command signal for using, for example, SD1 and SD2 in the control signal is added to the synchronization signal included in the unused time slot. There is. Mobile radio 1
By receiving this signal at 00, the wireless base station 30
To SD1 and SD2 in the time slot SUn
A control signal to the effect that the user wants to use the mobile radio 1
This preparation is executed on the 00 side. On the other hand, the radio base station 30 also prepares for reception in the time slots SU1 and SU2.

After the above preparations, if mutual confirmation is made and it is determined that the execution is possible, the mobile radio 100 transmits the uplink time slots SU1 and SU2 to the radio base station 30.
From now on, if the transmission is started in the downlink time slots SD1 and SD2, the diversity can be applied from the start of the calling.

In the above description, the case of duality of the multiplicity of diversity using two time slots has been described, but the multiplicity can be similarly increased when the multiplicity is further increased.

In the above description, the order of using the time slots accommodated in the same frame when applying the transmission diversity is not predetermined.
However, in order to simplify the operation of the system, it is preferable to predetermine the combination of time slots to which the transmission diversity is applied. That is, in FIG. 2, n is a multiple of 3 and n = 3m. Time slots SD1, SD2 ..., SDm, SDm + 1, SDm + 2
…, SD2m, SD2m + 1, SD2m + 2,…, SD
Of 3m, SD1 and SDm + 1, SD2 and SDm +
2. If each set of SDm and SD2m is defined as a time slot to which transmission diversity is applied, the control operation can be considerably simplified. Further, in this case, if the time compression rate is set in advance to twice the minimum compression rate required by the system, the circuit configuration is simplified.

Although the case where the transmission diversity is applied to the communication has been described above, the time-divided telephone signals in the same frame have the same contents. However, this does not necessarily have to be the same content. Rather, in order to enhance the diversity effect, it is better to accommodate time piece signals that are temporally different from each other in the same frame for transmission. This is because the effect of fading due to the propagation of multi-wave radio waves is likely to be simultaneously applied to the time piece signals within the same frame. Therefore, it is better to send time piece signals with the same content differently in time. This is because there is a high possibility that the original signal can be reproduced well by the machine.

A method of transmitting the time piece signals having the same content while temporally different from each other will be described. First, in the mobile wireless device 100 of FIG. 2, it is necessary to insert a signal delay circuit (delayed by time τ) at the input part of the signal mixing circuit 152. However, it is assumed that the delay time τ is given a delay time that is an integral multiple of one time slot (and the sum of one guard time) according to an instruction from the control unit 140. Further, it is necessary to insert a signal delay circuit (delayed by time τ) at the output section of the signal division circuit 139. However, it is assumed that the delay time τ is given a delay time that is an integral multiple of one time slot (and the sum of one guard time) according to an instruction from the control unit 140.

Similarly, in the radio base station 30 of FIG. 3, it is necessary to insert a signal delay circuit (delayed by time τ) at the input section of the signal selection circuit group 39. However, it is assumed that the delay time τ is given a delay time that is an integral multiple of one time slot (and the sum of one guard time) according to an instruction from the control unit 140. Further, it is necessary to insert a signal delay circuit (delayed by time τ) at the output section of the signal allocation circuit group 52. However, it is assumed that the delay time τ is given a delay time that is an integral multiple of one time slot (and the sum of one guard time) according to an instruction from the control unit 140. With such a configuration, a temporal diversity effect can be obtained.

[0094]

As is apparent from the above description, by applying the present invention to a mobile communication system, the multiple load gain of a signal can be increased from the conventional value, and the radio transmission power can be reduced accordingly. Since it becomes possible and the same signal can be transmitted a plurality of times, a transmission diversity effect can be obtained and the line quality can be improved. Therefore, the effect of the present invention is extremely large.

[Brief description of drawings]

FIG. 1 is a conceptual configuration diagram showing a concept of a system of the present invention.

FIG. 2 is a circuit configuration diagram of an embodiment of a mobile wireless device for explaining the principle of the present invention.

FIG. 3 is a circuit configuration diagram of an embodiment of a radio base station for explaining the principle of the present invention.

FIG. 4 is a time slot structure diagram for explaining time slots used in the system of FIGS. 1 to 3;

FIG. 5 is a spectrum diagram showing spectra of a call signal and a control signal.

FIG. 6 is a circuit configuration diagram for multiplexing a voice signal and a data signal.

FIG. 7 is a waveform diagram showing a radio signal waveform of a time slot.

FIG. 8 is a spectrum diagram showing spectra of a time-compressed speech signal and control signal.

FIG. 9 is a multiple load gain diagram showing multiple load gains obtained in various systems.

FIG. 10 is a flow chart showing a flow of a calling operation of the system of FIGS. 1 to 3.

FIG. 11 is a flow chart showing a flow of a calling operation of the system of FIGS. 1 to 3 together with FIG. 10.

FIG. 12 is a flow chart showing an operation flow when diversity is applied in the system of FIGS. 1 to 3;

FIG. 13 is a flow chart showing a flow of operations when diversity is applied to the system of FIGS. 1 to 3 together with FIG. 12;

[Explanation of symbols]

 10 Telephone Network 20 Gateway Switch 22-1 to 22-n Communication Signal 30 Radio Base Station 31 Signal Processing Unit 32 Radio Transmission Circuit 35 Radio Reception Circuit 38 Signal Speed Restoration Circuit Group 38-1 to 38-n Signal Speed Restoration Circuit 39 Signal Selection circuit group 39-1 to 39-n Signal selection circuit group 40 Control unit 41 Clock generator 42 Timing generation circuit 51 Signal speed conversion circuit group 51-1 to 51-n Signal speed conversion circuit 52 Signal allocation circuit group 52-1 -52-n signal allocation circuit 81 speech path control unit 82 ID identification storage unit 83 switch group 91 digital encoding circuit 92 multiplex conversion circuit 100, 100-1 to 100-n mobile radio 101 phone unit 120 reference crystal oscillator 121- 1, 121-2 Synthesizer 122-1, 122-2 Switch 123 Transmission / reception interrupt controller 131 Speed Conversion circuit 132 wirelessly transmitting circuit 133 transmits the mixer 134 transmission unit 135 radio reception circuit 136 receives the mixer 137 receiving section 138 time expansion circuit 139 a signal dividing circuit 141 a clock regenerator 142 timing generator 152 signal mixing circuit 182 ID information collation storage unit

Claims (1)

[Claims] 1. A radio base means (30), each of which covers a plurality of zones to form a service area, and a frame structure for moving across the plurality of zones and communicating with the radio base means. Time division movement using barrier exchange means (20) for exchanging communications with each mobile radio means (100) using radio channels carrying time-compressed delimited signals in time slots. In body communication, by increasing the compression ratio of the signal for obtaining the temporally compressed delimited signal, increase the number of multiplexed signals, it is possible to reduce the transmission power by increasing the multiple load gain, A diversity communication method for time division mobile communication in which a transmission diversity effect is obtained by transmitting a time-compressed delimited signal a plurality of times.