JPH04227136A - Radio base station and mobile radio for time division communication in mobile body communication - Google Patents

Abstract

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

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio base station for time-division communication of a radio communication channel in mobile communication and a mobile radio. More specifically, a plurality of radio channels out of a number of radio channels provided to the system are provided, using which one of a number of mobile radios within a service area can communicate with an opposing radio base. While you are communicating with a station by setting up a wireless line, another mobile radio device wishes to communicate using one or more of the radio channels used by the mobile radio device you are communicating with. When I came,
At least one radio channel can be shared between other mobile radios and the radio base station to create an independent radio link without adversely affecting the communication between the mobile radio and the radio base station that are already in communication. The present invention relates to a time-division communication system capable of transmitting and receiving diversity for multiple wireless channels. 2. Description of the Related Art In mobile communication using voice using a small zone method, a method employing time division time compression multiplexed signals is described in the following document. [0003] Literature 1. Ito “Study of mobile phone system - Proposal of time-division time compression FM modulation system -” IEICE technical report
RCS89-11 July 1989 [0004] Literature 2. Ito “Studying mobile phone systems-
"Theoretical Study of Time-Division Time Compression FM Modulation System" IEICE Technical Report RCS89-39 October 1989 [0005] That is, 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. Radio reception having reception mixers that communicate with each other and are built into mobile radios and radio base stations to angle-modulate or amplitude-modulate carrier waves with accommodated signals and transmit and receive them intermittently over time. A switch circuit is provided for the circuit, a wireless transmitting circuit having a transmitting 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. , this intermittent state is synchronized with transmission and reception, and the same intermittent transmission and reception as described above is synchronized with that of the mobile radio device for the wireless base station communicating with the opposite side, and on the receiving side, in the predetermined time slot. In order to extract only the stored signal, the wireless reception circuit is opened and closed to receive the signal, and the signal obtained by demodulation is stored in a storage circuit, and when it is read out, it is read out at 1/n of the speed at which it is stored in this storage circuit. An example of a system has been reported in which the baseband signal, which is the original transmitted signal, can be reproduced by reading it out at a low speed. [0006] Furthermore, in Document 2, a study is conducted on adjacent channel interference and co-channel interference, which are problems when applying the TCM (time division time compression multiplexing)-FM system as described above to a small zone. , the possibility of realizing the system is shown by appropriately selecting the system parameters. However, no explanation is provided regarding the operational state of the system, for example, how to deal with deterioration in signal transmission quality due to high-speed movement of mobile radio equipment. [0007] Problems to be Solved by the Invention: For example, a mobile radio device that is moving at a walking speed becomes faster because it is mounted on a car or the like, and the transmitting/receiving diversity method that has been applied in the past becomes ineffective. If it becomes appropriate, or if the radio wave propagation characteristics of the transmission medium intervening between the mobile radio device and the radio base station that communicates with each other change significantly due to the influence of the surrounding topography and features, Even if the existing diversity method becomes inappropriate, there is no known means to deal with this problem, resulting in redundancy in the system design and failure to achieve the required performance, which in turn leads to unsatisfactory results in terms of effective frequency utilization. Issues remained to be resolved. [0008]
[Means for solving the problem] A mobile radio device and a radio base station are equipped with a communication quality monitoring unit that detects deterioration in transmission quality, and multiple radio channels are provided in response to the degree of quality deterioration, which was not previously used. We have created a configuration that can implement a transmitting/receiving diversity method that optimally combines frequency diversity using , and time diversity using multiple time slots within the same radio channel. As a result, even if signal quality deterioration occurs due to changes in the moving speed of the moving object or changes in the radio wave propagation state due to the influence of the topography and features around the moving object,
To address this issue, we have created a system that always satisfies the transmission quality required of the system and has high frequency utilization efficiency. [Operation] A wireless base station and a large number of mobile wireless devices exist within its service area, and one wireless channel is used to enable any number of mobile wireless devices to communicate with the wireless base station. A system has been constructed that is temporally divided into a plurality of time slot series, and is capable of selecting one or more of these time slot series and communicating using this. If one mobile radio device is communicating with a radio base station and another mobile radio device sends a message to this radio base station, the mobile radio device that newly wishes to communicate will be sent to the radio channel that is already in use. By providing one of the unused time slot sequences to enable communication with the wireless base station, the plurality of sets of communications can be performed without interfering with each other, and It is now possible to carry out communications without adversely affecting one's own communications. [0010] Furthermore, if the radio wave propagation characteristics change due to a change in the moving speed of the mobile radio device or a change in the topography or features around the mobile radio device, and it becomes necessary to apply transmitting/receiving diversity, it is possible to use exactly the same communication signal. are added to one time slot sequence of different radio channels, respectively, and
This is transmitted by a wireless base station, received by a mobile radio equipped with multiple receivers so that it can receive signals from multiple wireless channels simultaneously, and mixed at the input of the telephone (terminal unit). Transmission signals from mobile radio equipment can be transmitted by multiple transmitters using multiple radio channels (frequency diversity) in one time slot sequence. Furthermore, by selecting a plurality of time slot sequences from among many time slot sequences set within one radio channel, it is possible to improve communication quality through time diversity transmission and reception. In this case, the same communication signal is transmitted from the wireless base station to multiple time slot sequences within the same wireless channel, received by the mobile wireless device, and mixed at the telephone (terminal section) input. In addition, diversity transmission and reception was made possible by transmitting signals from mobile radios in multiple time slot sequences, receiving them at radio base stations, and mixing them. Furthermore, by using the two types of diversity, frequency and time, as described above, it is possible to perform diversity transmission and reception with a large diversity effect. Embodiment FIGS. 1, 2 and 3 show a system configuration for explaining an embodiment of the present invention. In FIG. 1, 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, which includes an interface with the gateway exchange 20, a circuit for converting signal speeds, a circuit for allocating and selecting time slots, a control section, etc., and is responsible for setting and canceling wireless lines. , has a wireless transmitting/receiving circuit for exchanging wireless signals with the mobile wireless devices 100 (100-1 to 100-n). [0015] Here, the barrier switch 20 and the wireless base station 30
There is a transmission line between them for transmitting communication signals 22-1 to 22-n including communication signals of communication channels CH1 to CHn and control signals. FIG. 2 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 of the two channels received by the antenna section are transmitted to a radio receiving circuit 135-1 including a receiving mixer 136-1 and a receiving section 137-1, and a receiving mixer 136-2 and a receiving section 137, respectively. -2, and its output communication signal is input to two speed recovery circuits 138-1, 138-2 and a clock regenerator 141, respectively. The clock regenerator 141 regenerates the clock from the received signal and sends it to the speed restoration circuit 138.
-1, 138-2, control unit 140, timing generator 1
42 and speed conversion circuits 131-1 and 131-2. The speed restoration circuits 138-1 and 138-2 restore the speed (pitch in the case of analog signals) of the divided control signals or compressed and divided communication signals in the received signal, and convert them into continuous Signal mixing circuit 15 as a signal
2 and the control unit 140, and the signal mixing circuit 152
The mixed signals are input to the communication quality monitoring section 171, the ID information verification storage section 182, and the telephone section 101. The communication quality monitoring unit 171 constantly monitors the quality during communication, and if the communication quality deteriorates below a specified value, it immediately informs the control unit 140 and the control unit 140 adjusts the communication quality. Actions will be taken to maintain the The communication signal output from the telephone section 101 is divided by a signal dividing circuit 139, and then divided by two speed converting circuits 131-1 and 131-2 at predetermined time intervals to determine the speed. (pitch in the case of an analog signal) at high speed (compression) and transmit it on two channels, a wireless transmission circuit 132-1 including a transmission mixer 133-1 and a transmission section 134-1 and a transmission mixer 133-
2 and a transmitter 134-2.
The transmission signal is sent out from the antenna section and received by the radio base station 30.
The timing generator 142 uses the clock from the clock regenerator 141 and the control signal from the control section 140 to control the transmission/reception intermittent controller 123 and the speed conversion circuit 1.
31-1, 131-2, radio receiving circuit 135-1, 13
5-2 and speed restoration circuits 138-1 and 138-2. In addition, the clock regenerator 14
The clock from 1 is the speed conversion circuit 131-1, 131
-2 is also applied. The mobile radio 100 further includes synthesizers 121-1 to 121-4 and a changeover switch 1.
22-1 to 122-4 and selector switch 122-1
A transmission/reception intermittent controller 123 and a timing generator 1 generate signals for switching the signals 122-4 to 122-4, respectively.
42, synthesizers 121-1 to 1
21-4, the transmission/reception intermittent controller 123, and the timing generator 142 are controlled by the control unit 140 so that the two channels can be transmitted and received simultaneously. Each synthesizer 121-1 to 121-4 includes a reference crystal oscillator 12.
A reference frequency is supplied from 0. Frequency diversity is enabled by transmitting and receiving two channels simultaneously. The ID information verification storage section 182 receives identification information (ID) transmitted from the wireless base station 30 from the signal mixing circuit 152, and under the control of the control section 140, collates it with the stored contents and updates the ID information as necessary. memorize it. Figures 3 to 5
3 shows the overall configuration of the wireless base station 30 and a specific example of the switch group 83 that is a component thereof, the signal speed restoration circuit group 38, the signal selection circuit group 39, the signal speed conversion circuit group 51, and the signal allocation circuit group 52, respectively. A specific example of the configuration is shown. N-channel communication signal 2 with gateway switch 20
2-1 to 22-n are connected to a signal processing section 31 forming an interface by a transmission path. Now, as shown in the figure, communication signals 22-1 to 22-n sent from the barrier exchange 20 are input to the signal processing section 31 of the radio base station 30. Signal processing section 31
In addition to being equipped with an amplifier to compensate for transmission loss, so-called 2-wire to 4-wire conversion is performed. That is, the input signal and the output signal are mixed and separated, and the barrier switch 20
The input signal from S
RA-1-1, SRA-1-2,..., SRA-1-n,
SRA-2-1, SRA-2-2,...SRA-2-n,
...,...,SRA-n-1,SRA-n-2,...,SRA
-n-n, and SRB-1-1, SRB-1-2,...,S
RB-1-n, SRB-2-1, SRB-2-2,...,
SRB-2-n, ..., ..., SRB-n-1, SRB-n
-2,...,SRB-n-n, and STA-1-1,S
TA-1-2,..., STA-1-n, STA-2-1,
STA-2-2,..., STA-2-n,...,..., STA
-n-1, STA-n-2, ..., STA-n-n, and S
TB-1-1, STB-1-2,..., STB-1-n,
STB-2-1, STB-2-2,..., STB-2-n
,...,..., STB-n-1, STB-n-2,..., ST
The signal is sent to signal speed conversion circuit groups 51A and 51B (see FIG. 5) via switch group 83 including Bn-n. Further, the signal speed restoration circuit group 38A, 3 whose details are shown in FIG.
The output signal from 8B is transmitted to the barrier exchange 20 via the switch group 83 by the signal processing section 31 using the same transmission path as the input signal, as shown in FIGS. 4 and 3. Here, the switch group 83 includes transmission switches STA-1-1 to
STA-nn, STB-1-1 to STB-nn,
Reception switches SRA-1-1 to SRA-n-n,S
They are roughly divided into RB-1-1 to SRB-n-n, all of which are controlled by a communication path control section 81 and connected to a switch group 83.
It opens and closes to achieve the desired purpose and operates to allow transmit and receive diversity. The ID identification storage section 82 is used to identify and store the ID of the mobile radio device 100. Further, the communication path control unit 81 opens and closes the switch group 83 according to commands from the control unit 40 to control the communication path.
1 also has the function of providing information and requesting control to the control unit 40. Among the above input signals from the gateway exchange 20, after passing through the switch group 83, they are input to the signal speed conversion circuit groups 51A and 51B each including a number of signal speed conversion circuits 51-1 to 51-n, and are input to the signal speed conversion circuit groups 51A and 51B, respectively, and The speed (pitch) is converted by dividing it into time intervals. Also, wireless base station 3
0 to the gateway exchange 20, the outputs of the radio receiving circuits 35A and 35B are respectively transmitted to the signal selection circuit group 3.
Signal speed restoration circuit group 38A via 9A and 39B
and 38B, and after being subjected to speed (pitch) conversion, it is input to the signal processing section 31 through the switch group 83. Now, the control of the radio reception circuits 35A and 35B or the output of the communication signal is performed by signal selection circuit groups 39A and 39B, each including a set of signal selection circuits 39-1 to 39-n that select signals for each time slot. Here, speech signals are separated corresponding to each speech channel CH1 to CHn. This output undergoes signal speed restoration circuit groups 38A and 38B, each including a set of signal speed restoration circuits 38-1 to 38-n provided for each channel, to restore the signal speed (pitch), and then 83 to the signal processing unit 31 and undergoes 4-wire to 2-wire conversion, the output is sent to the barrier exchange 20 as communication signals 22-1 to 22-1.
22-n. Next, signal speed conversion circuit groups 51A and 5
The functions of 1B will be explained. [0028] Input signals such as audio signals and control signals divided into a certain length of time are stored in a storage circuit, and when read out, the speed is changed, and the signal is read out at a speed that is, for example, 15 times the storage speed. It becomes possible to compress the time length. The principle of the signal speed conversion circuit groups 51A and 51B is the same as when playing back audio recorded by a tape recorder at high speed, and in reality, for example, a CCD
(Charge Coupled Device),
BBD (Bucket Brigade Device)
) 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: Kosaka et al. “Compressing/expanding the time axis of conversation” "A Tape Recorder" Nikkei Electronics, July 26, 1976, pp. 92-133). The circuits using CCD and BBD exemplified in the signal speed conversion circuit groups 51A and 51B can be directly applied to the signal speed restoration circuit groups 38A and 38A, as described in the above-mentioned document.
In this case, the read speed is faster than the write speed by receiving a timing signal from a timing generator 42 that generates timing using a clock from a clock generator 41 and a control signal from a control unit 40. This can be achieved by slowing down the speed. The control or audio signals output from the barrier switch 20 via the signal processing section 31 are input to the signal speed conversion circuit groups 51A and 51B, and after speed (pitch) conversion processing is performed, the time signal is - Applied to signal allocation circuit groups 52A and 52B that allocate signals to each slot. The signal allocation circuit groups 52A and 52B are buffer memory circuits, and the signal speed conversion circuit groups 51A and 52B are buffer memory circuits.
51B, and reads out the signal in the buffer memory using timing information from the timing generation circuit 42 given in accordance with instructions from the control unit 40, and transmits it to the wireless transmission circuit 32. . When this timing information is viewed in terms of channels, it is arranged in series without overlapping in chronological order, and when all the control signals or call signals described later are implemented, it becomes as if it were a continuous signal wave. . [
FIG. 6 shows another embodiment of the mobile radio device 10.
0B is shown. Here, the mobile radio device 1 shown in FIG.
The difference in configuration from 00 is that there are four speed restoration circuits 138-1.
1 to 138-4 and four speed conversion circuits 131-1 to 131-4 are provided. To explain its operation, the receiving section 137-1 of the radio receiving circuit 135-1
The output of is applied to both speed recovery circuits 138-1 and 138-3, and the same communication signal is received in diversity using two different time slots within one radio channel. Also, the receiving section 13 of the wireless receiving circuit 135-2
The output of 7-2 is applied to both speed recovery circuits 138-2 and 138-4 to diversity receive the same communication signal using two different time slots in one other radio channel. Therefore, the outputs of the four speed restoration circuits 138-1 to 138-4 are transferred to the signal mixing circuit 15.
By mixing at 2, it is possible to obtain both time diversity and frequency diversity effects. In order to obtain such an effect, the control section 140B is configured as shown in FIG.
Although the control is slightly different from that of the control unit 140, other components having the same functions can be used in the mobile radio devices 100 and 100B. The compressed signals of the radio transmitting circuits 32A and 32B (hereinafter simply referred to as 32 because they have the same function) of the radio base station 30 and the radio receiving circuits 35A and 35B (both of them are simply referred to as 32) are shown below. Since it has the same function, it will be simply referred to as 35 below.) The state of the compressed signal will be explained with reference to FIGS. 7 and 8. Signal speed conversion circuit group 51 (51A and 5
Since 1B has the same function, it is simply referred to as 51. ) is input to a signal allocation circuit 52 (52A and 52B are simply referred to as 52 since they have the same function, and the other components are similarly indicated), and the time slots are allocated in a predetermined order. Given. (a in Figure 7)
SD1, SD2, . . . , SDn in ) indicate that the speed-converted communication signals are allocated to each time slot. Here, one time slot accommodates a synchronization signal, a control signal, and/or a communication signal as shown in the figure. If a speech signal is not implemented, only a synchronization signal is added by the channel control unit 81, and an empty slot signal is added to the speech signal portion, or depending on the system, no signal is provided at all to the empty time slot including the carrier wave. may not be sent. In this way, Figure 7
As shown in (a), in the wireless transmission circuit 32,
A signal forming one frame is applied to the modulation circuit in time slots SD1 to SDn. This time-series multiplexed signal to be transmitted is subjected to amplitude or angle modulation in the radio transmission circuit 32, and then is sent out into space from the antenna section. Regarding the transmission of control signals between the radio base station 30 and the mobile radio device 100 prior to a telephone call in the making and receiving of a telephone call, whether within the call signal band or outside the call signal band is used. It is possible. FIG. 9 shows these frequency relationships. In other words, (a) in the figure 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 (for example, when it is desired to apply diversity). [0037] 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 modulating the tone to create a subcarrier signal. becomes. The above was a case of analog signals, but if a digital data signal is used as a control signal, it is also possible to digitally encode the audio signal and time-division multiplex the two for transmission. , the circuit configuration in this case is shown in FIG. FIG. 10 shows an example of a case where an audio signal is digitized by a digital encoding circuit 91, and a data signal is multiplex-converted by a multiplex conversion circuit 92, and then applied to a modulation circuit included in the wireless transmission circuit 32. The audio signal and the control signal can be extracted separately by receiving the signal with the opposing receiver and performing the operation opposite to that shown in FIG. 11 in the demodulation circuit. 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. In the case of diversity, the same signal is sent from the mobile radio device 100 using multiple radio channels, but the basic operation is the same as in the case of one radio channel, so in the following, the same signal is sent using one radio channel. A case where the data is sent using a wireless channel will be explained. FIG. 7(b) schematically shows this upstream input signal. That is, time slots SU1, SU2
,..., SUn is the mobile radio device 100-1, 100-2,
..., 100-n (for example, 30-n)
1) Indicates the transmitted signal to the destination. Also, each time slot SU
The contents of 1, SU2, . . . , SUn are shown in detail in the lower left of FIG. however,
If the distance between mobile radio device 100 and radio base station 30 is short or depending on the signal speed, it is possible to omit the synchronization signal. Furthermore, FIG. 8 schematically shows the waveform within the time slot of the radio carrier wave of the above uplink radio signal.
It will look like (c). Now, among the input signals that have arrived at the radio base station 30, the control signal is immediately applied to the control section 40 from the radio reception circuit 35. However, depending on the magnitude of the speed conversion rate, it is also possible to apply the signal to the control unit 40 from the output of the signal speed restoration circuit group 38 after performing the same processing as the call signal. Further, the call signal is applied to the signal selection circuit group 39. The signal selection circuit group 39 includes a control section 4
A timing signal from a timing generation circuit 42 that generates a predetermined timing is applied in response to an instruction from a control signal from 0, and a synchronization signal, control signal, or speech signal is separated and output for each time slot SU1 to SUn. Each of these signals is input to a signal speed restoration circuit group 38. This circuit has the function of performing inverse conversion of the speed conversion circuit 131 (FIG. 2) in the mobile radio device 100 on the transmitting side, thereby faithfully reproducing the original signal and transmitting it to the gateway exchange 20. become. [0041] Hereinafter, the manner in which signals are transmitted in the signal space according to the present invention will be explained using the required transmission band and the relationship between this and adjacent radio channels. [0042]
As shown in FIG. 3, 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 signal to the wireless transmission circuit 32 from the output of the signal allocation circuit group 52 after performing the same processing as the call signal. As shown in FIG. 2, the mobile radio device 100 also has a circuit configuration that can support the functions of the radio base station 30, in which one communication path is transmitted and received over two channels. [0043] The original signal, for example, a speech signal (0.3 kHz
~3.0kHz) is the signal speed conversion circuit group 51 (Figure 3)
The frequency distribution on the output side when passing through is as shown in FIG. In other words, as mentioned above, if the audio signal is 1
If the signal is converted five times, the frequency distribution of the signal will be expanded to 4.5 kHz to 45 kHz, as shown in FIG. Now, FIG. 11 shows a case where the control signals are simultaneously transmitted using the lower frequency band of the speech signal. Among these signals, control signals (0.2 to 4.
0kHz) and one call signal CH1 (4.5~45kHz)
z) is accommodated in a time slot, say SD1. The same applies to the speech signals accommodated in the other time slots SD2 to SDn. That is, time slot SDi (i=
2, 3,...,n) are control signals (0.2 to 4.0kHz
) and a communication signal CHi (4.5 to 45 kHz) are accommodated. However, the signals in each time slot are arranged in chronological order, and the signals in multiple time slots are never applied to the wireless transmission circuit 32 at the same time. When these communication signals are applied to the angle modulation section included in the wireless transmission circuit 32 together with the control signal, the required transmission band is at least fC ±45kHz.
Requires. where 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. Let frep be the frequency interval of a plurality of radio channels, and let fH be the maximum signal speed due to the above-mentioned high-speed audio signal, then the following inequality must hold between the two. frep>2fH On the other hand, in digital signals, audio is usually digitized at a speed of about 64 kb/s, so it is necessary to read it by raising the scale on the horizontal axis in Figure 11, which explains the case of analog signals, by about one digit. However, the relationship in the above equation also holds true in this case. [0047] Furthermore, the mobile radio device 100
0 is input to the radio reception circuit 35, a part of its output is input to the control unit 40, and the rest is sent to the signal speed restoration circuit group 38 via the signal selection circuit 39. . 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 is transmitted to the general telephone network 10.
The signal speed is the same as that used in , and is sent to the barrier exchange 20 via the signal processing section 31 . Next, the call originating/receiving operation and the application of transmitting/receiving diversity in the system according to the present invention will be explained using a voice signal as an example. (1) Call origination from mobile radio device 100 Diagram 12
, will be explained using flowcharts shown in FIGS. 13 and 14. When the power of the mobile radio device 100 is turned on, the radio reception circuit 135 in FIG. Time slot SDi
capture of the control signal is started (S201, S202, FIG. 12). If the system is provided with more than one radio channel, i) the radio channel exhibiting the highest received input electric field; ii)
(iii) A wireless channel that is instructed by a control signal included in the wireless channel (iii) A channel with an empty time slot among the time slots in the wireless channel, etc. CH1) is in the receiving state. This is possible by capturing the synchronization signal within the time slot SDi shown in FIG. 7(a). In the control unit 140, the synthesizer 121-1
A control signal is sent to switch 1 to generate a local frequency that enables reception of wireless channel CH1.
22-1 is in a state of being tilted and fixed toward the synthesizer 121-1 side. [0051] If the control signal transmitted from the radio base station 30 can be successfully received in the above state (S203
YES), the calling operation continues using the wireless channel CH1 (S204), but it is assumed that good reception is not possible due to the following reasons (NO in S203). That is, i) If the mobile radio device 100 is moving at high speed and transmit/receive diversity is not performed, the predetermined received signal quality will not be satisfied. ii) The radio wave propagation characteristics are poor due to the influence of the topography and terrestrial objects around the mobile radio, making it impossible to obtain a predetermined received signal quality. When the above state continues for a certain period of time, as shown in FIG.
The communication quality monitoring unit 171 reports this to the control unit 140. In response to this, the control unit 140 determines that transmission/reception diversity should be performed, and in response to a control signal from the control unit 140 in FIG. Capture of control signals included in the channels (channels CH1 and CH2) is started (S205). Therefore, the handset of the telephone section 101 is turned off.
When hooking (starting calling) (S20, 6, FIG. 13), the synthesizer 121-3 in FIG.
Synthesizer 121-4 receives a control signal from control unit 140 to generate a local frequency that enables transmission of radio channel CH2. However, speed restoration circuit 13
8-1 and speed restoration circuit 138-2 are already in operation. Next, radio channels CH1 and C
The calling control signal output from the telephone unit 101 is sent using H2. However, it is assumed that speed conversion circuit 131-1 and speed conversion circuit 131-2 are already in operation. Now, the above radio channel CH1 or C
The H2 control signal uses the frequency band shown in FIG. 9(b), and is transmitted using, for example, time slot SUn. In the following explanation, the radio channel CH1 will be explained. It also applies to radio channel CH2.
This is because the operation exactly the same as in 1 proceeds. This control signal is sent out in time slot S.
Since the signal is limited to Un and is sent in bursts and no signals are sent during other time periods, 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 time slot of one frame later or the next frame will be used. Sent using SUn. To capture time slot SUn,
Specifically, the following method is used. The control signal transmitted from the radio base station 30 includes a synchronization signal and a subsequent control signal, as shown in FIG. becomes possible. Furthermore, this control signal includes control information such as currently used time slots and unused time slots (empty time slot display). In some systems, time slots SDi (i=1, 2
,...,n) may contain only synchronization and speech signals when they are being used by other communications, but even in such cases, unused time slots usually contain synchronization and control signals. is included, and by receiving this control signal, the mobile radio device 100 can determine which time
It is possible to know whether to use the slot to transmit a calling signal. Note that if all time slots are in use, it is impossible to make a call on this radio channel, and it is necessary to sweep and search for another radio channel. In another system, there is a case where no empty slot is displayed in any of the time slots, and in this case, the following audio multiplex signals SD1, SD2
,..., it is necessary to search for the presence or absence of SDn 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 sends out the call control signal. It is possible to judge whether the transmission should be sent or not, including the timing of the transmission. [0061] Therefore, time slot S for uplink signal
Assuming that Un is an empty time slot, it is decided to use this empty time slot, send out a call control signal, extract the necessary timing from the response signal from the wireless base station 30, and perform burst control. A signal can be sent. [0062] If there is a call from another mobile radio at the same time, the call signal will not be received properly by the radio base station 3 due to call collision.
However, when viewed as a system, this probability is kept to a sufficiently small value. If call collisions are to be further reduced, the following measures may be taken. 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 it. That is, as a calling signal, the portion of the time slot used is divided into several types, and this is used to classify a large number of mobile radio devices into groups, and each group is given a time slot within that one time slot. This is a method of giving a belt. Another method is to create many different frequencies for control signals, classify a large number of mobile radios into groups, and give the created frequencies 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 in combination, the effects will increase synergistically. Now, the mobile radio device 100 goes off-hook (S206, FIG. 13), and when the call control signal is sent out using the time slot SUn of the radio channels CH1 and CH2, Received in good condition,
When the control unit 40 of the radio base station 30 detects the ID (identification signal) of the mobile radio device 100 (S207), the control unit 40 searches for a currently vacant time slot. The time slot given to the mobile radio device 100 is SU
n is fine, but just to be sure, perform 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 classifications. As a result, for example, time slot SD
1 is vacant, the time slot SDn of the radio channel CH1 is used for the mobile radio device 100, and the time slot upstream (mobile radio device 1
00→radio base station 30) SU1 and the corresponding downlink (radio base station 30→mobile radio device 100) SD1 are instructed to be used (S208). In response, the mobile radio device 100 transitions to a state in which it can receive data in the designated time slot SD1, and at the same time, the mobile radio device 100 shifts to a state in which it can receive data in the designated time slot SD1, and also transmits time slot SU1 (FIG. 7(b) ). 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 is activated.
and 122-2 to start operating (S209). At the same time, a slot switching completion report is sent to the wireless base station 30 using uplink time slot SU1 (S210
), wait for a dial tone to be sent (S21
1). [0066] The radio carrier wave time of this uplink radio signal
The state of the slot SU1 is schematically shown in FIG. 8(c). The radio base station 30 has a time slot SU.
In addition to 1, SU3 and SUn are sent as uplink signals from other mobile radio devices 100, included in one frame. Upon receiving the slot switching completion report (S212), the wireless base station 30 sends a calling signal together with the ID of the mobile wireless device 100 to the gateway switch 20 (S213).
. On the other hand, the gateway switch 20 detects the ID of the mobile radio 100, turns on the necessary switches among the switch groups included in the barrier switch 20 (S214), and transmits the dial tone to the radio base station 30. Send (S215,
Figure 14). [0067] This dial tone is the radio base station 30
mobile radio 10 using time slot SD1.
0 (S216), and in the mobile radio device 100,
It is confirmed that the communication path has been set (S217). The above description has been regarding radio channel CH1, but it is confirmed that the same procedure as above is followed for channel CH2, and that a communication path is established at approximately the same time. [0069] Although there is no problem in the above example, the time allocated to the audio signal in radio channels CH1 and CH2
Depending on the slot number, speed restoration circuits 138-1 and 1
There may be a time difference between the audio output and the signal output signal 38-2, and in this case, it is necessary to compensate for the time difference after the signal is added to the signal mixing circuit 152. This is not particularly technically difficult; for example, if the time slot numbers allocated within each radio channel shown in FIG. 7(a) are
If CH2 is q, and p>q, the output of channel CH2 appears to the speed restoration circuit 138-1 earlier by (p-q) slots. Therefore, the delay circuit (
(not shown), the signal of channel CH1 may be delayed by the time of (p-q) slots and the signals may be mixed. This allows reception of signals with a frequency diver effect. When a communication signal can be obtained from the signal mixing circuit 152 in this way, the telephone unit 10 of the mobile radio 100
Since a dial tone is heard from the handset of No. 1, the dial signal begins to be sent. The dial signal from the mobile radio 100 is divided by a signal division circuit 139 and speed-converted by speed conversion circuits 131-1 and 131-2.
two transmitting sections 134-1, 134-2 and transmitting mixer 1
Wireless transmission circuit 132-1, including 33-1, 133-2;
132-2, using the upstream time slot SU1 of channels CH1 and CH2, respectively (S2
18). Thus, the transmitted dial signal is received by the radio receiving circuits 35A and 35B of the radio base station 30. [0070] This radio base station 30 has already responded to the calling signal from the mobile radio device 100 and has determined the time and date to be used.
While giving cryptographic information regarding the slot, the signal selection circuit groups 39A, 39B and the signal allocation circuit groups 52A, 52B of the radio base station 30 are operated, and for example, 39A and 52A are assigned to radio channel CH1, and 39A and 52A are assigned to the same channel CH2. 39B and 52B are respectively allocated to the channels, the uplink time slot SU1 of channels CH1 and CH2 is received, and the state has shifted to the state where the signal of the downlink time slot SD1 of channels CH1 and CH2 is transmitted. Also, the communication path control section 81 uses the control signal from the control section 40 to select the switches SRA-1-1 and SRB-1-1 for reception among the switch group 83, and the switch STA-1-1 for transmission. and STB-1-1
is set to on (Figure 4). Therefore, the dial signal transmitted from the mobile radio 100 passes through each signal selection circuit 39-1 of the signal selection circuit groups 39A, 39B, and then passes through each signal speed restoration circuit 38-1 of the signal speed restoration circuit group 38A, 38B. 1, the original transmission signal is restored here, and transferred to the gateway exchange 20 as a call signal 22-1 via the switch group 83 and the signal processing unit 31 (S2
19), a call path to the telephone network 10 is set (S220
). On the other hand, the input signal from the barrier exchange 20 (
The initial control signal and the call signal when the call is started are sent to the switch STA- of the switch group 83 in the wireless base station 30.
1-1, STB-1-1, the signal speed conversion circuits 51-1 of the signal speed conversion circuit groups 51A and 51B undergo speed conversion, and then the signal speed conversion circuits 51-1 of the signal speed conversion circuit groups 51A and 51B pass through each signal allocation circuit of the signal allocation circuit groups 52A and 52B. 52-1 provides time slot SD1 for radio channels CH1 and CH2. Then, the wireless channel CH1 downstream from the wireless transmitting circuits 32A and 32B
, CH2, and is transmitted to the mobile radio device 100 using the time slot SD1 of CH2. [0073] In the mobile radio device 100, the radio channel CH
The radio receiving circuit 135-1, 135 is waiting for reception in each time slot SD1 of 1, CH2.
-2, and its output is received by the speed recovery circuit 138-1,
138-2. In this circuit, the original signal on the transmitting side is restored and input to the receiver of the telephone unit 101 via the signal mixing circuit 152. Thus, mobile radio 1
00 and a regular telephone in the regular telephone network 10, a high-quality telephone call using frequency diversity is started (S221). [0074] The call is terminated by the telephone section 101 of the mobile radio device 100.
By putting the receiver on the hook (S222),
The end of call signal and the on-hook signal from the control unit 140 are
It is sent to the wireless base station 30 from the wireless transmission circuits 132-1, 132-2 via the speed conversion circuits 131-1, 131-2 (S223), and the control unit 140 controls the operation of the transmission/reception intermittent controller 123. and switch 122-1 to 122-4 respectively to synthesizer 1.
It is fixed to the output end of 21-1 to 121-4. On the other hand, in the control section 40 of the wireless base station 30,
When the call termination signal is received from the mobile radio device 100, the call termination signal is transferred to the barrier switch 20 (S224), and the switches SRA-1-1, SRB-1-1, ST of the switch group 83
A-1-1 and STB-1-1 are turned off to end the call (S225). At the same time, signal selection circuit groups 39A, 39B and signal allocation circuit groups 52A, 52B in radio base station 30
to open. In the above description, control signals are exchanged between the radio base station 30 and the mobile radio device 100 using the signal speed conversion circuit group 51A or 51B and the signal speed restoration circuit group 38.
Although it has been explained that the signal speed conversion circuit group 51A, 51B, signal speed restoration circuit group 38-1,
38-2 or the signal processing unit 31, communication can be carried out without any problem. [0077] In the above explanation, frequency diversity is applied in which radio channels CH1 and CH2 are used from the beginning of a call. However, if the reception quality is good even without applying the frequency diversity described above, a call can be made using only one wireless channel. In this case, in the above explanation, wireless channel C
It is sufficient to focus only on the operation of H1 and ignore CH2. On the other hand, if diversity needs to be further strengthened, the same method as above can be applied as long as three or more wireless channels can be used. However, it becomes necessary to equip the mobile radio device 100 with three or more sets of transmitters and receivers.Although there is no problem in the above example, if multiple radio channels are used and time slots with different slot numbers are used, as described above. There is a delay in audio output related to the difference in time slot numbers. For this purpose, the control unit 140 of the mobile radio device 100 notifies the wireless base station 30 of the assigned time slot number, and upon receiving this, the wireless base station 30 transmits the signal speed restoration circuit group 3
It is necessary to operate a delay circuit (not shown) to compensate for the time difference included in 8. The operation of the mobile radio device 100 above is the same as that of the mobile radio device 100B (FIG. 6).
can be applied to the operation of (2) Incoming call to mobile radio device 100 The mobile radio device 100 is on standby with the power turned on. In this case, as explained in the section regarding the call origination from the mobile radio device 100, it is assumed that the signal reception condition is poor and that transmit/receive diversity is being executed. That is, it is assumed that the mobile terminal is in a waiting state to receive downlink control signals of wireless channels CH1 and CH2 according to a procedure determined by the system. An incoming call signal from the general telephone network 10 to the mobile radio device 100 via the barrier switch 20 is transmitted to the radio base station 3.
Suppose that it reaches 0. These control signals are communication signals 22
Similarly to the audio signal, the signal passes through the signal speed conversion circuit groups 51A and 51B via the switch group 83, and is transmitted to the control section 40 (FIG. 3) via the signal allocation circuit groups 52A and 52B. Then, the control unit 40 instructs the communication path control unit 81 to
Transmission and reception switches STA of switch group 83
, STB, SRA, and SRB, and instructs them to be kept in the on state. At the same time, an empty slot among the downlink time slots of radio channels CH1 and CH2 addressed to the mobile radio device 100, for example SD1, is used to transmit the ID signal of the mobile radio device 100 + incoming call signal display signal + time slot usage. A signal (for example, SU1 corresponding to SD1 is used for transmission from mobile radio device 100) is transmitted. In the mobile radio device 100 that has received this signal, the receiving sections 137-1 and 137-2 of the radio receiving circuits 135-1 and 135-2 send the signals to the control section 140, respectively.
transmitted to. The control unit 140 confirms that this signal is an incoming call signal to its own mobile radio 100, so it makes a ring tone sound from the telephone unit 101 and at the same time waits at the designated time slots SD1 and SU1. The transmitting/receiving intermittent controller 123 is operated so as to cause the switches 122-1 to 122-4 to start turning on and off. In this way, the state has shifted to a state in which calls can be made. However, even in the above state, the speed restoration circuit 138
-1, 138-2, and speed conversion circuit 131-1, 1
31-2 is assumed to be in a dormant state. (3) Application of transmission/reception time diversity Diversity using radio channels CH1 and CH2 is applied between the radio base station 30 and the mobile radio device 100 by the processes described in sections (1) and (2) above. In the following, we will explain how to apply even more effective transmission/reception time diversity by using other time slots on the same radio channel while calls are being made. , Figure 15
This will be explained using the flowchart shown in FIG. This type of transmit/receive diversity is applied for the purpose of improving the quality of communication when the received signal quality no longer satisfies the value determined by the system due to deterioration of radio wave propagation characteristics. First, a call is made from the mobile radio 100 described in section (1), and channels CH1 and CH
2, the downlink time slot SD1 and the uplink time slot SU1 are used, and the switches SRA-1-1, SRB-1-1 and STA-1-1 of the switch group 83
, STB-1-1 is turned on, and the mobile radio 100 connects to the telephone network 1 via the radio base station 30 and the barrier switch 20.
0 (S251, FIG. 15). At this time, the communication quality monitoring unit 171 in FIG. 6 detects the quality deterioration of the received signal, so it reports this to the control unit 140B. Upon receiving this report, the control unit 140B decides to apply diversity using other time slots in the same channel (S252), and starts searching for an empty time slot in the same radio channel (S253). . The following explanation takes radio channel CH1 as an example, but CH2
But it is equally doable. The mobile radio device used has the configuration 100B shown in FIG. Now, in order to search for an empty time slot, the speed restoration circuit 138-3 and the speed conversion circuit 131-
3 starts the operation of timing generator 14.
The timing signal No. 2 is changed, and time slots other than the time slot currently used for transmission and reception are also moved to a state where transmission and reception are possible. That is, timing generator 1
The timing signal generated by 42 causes the transmission/reception intermittent controller 123 to change the on/off method, and the speed restoration circuit 138-3
as outputs of other time slots SD2, SD3,...
, SDn are sequentially extracted, an empty time slot is searched (S254NO, S253), and if there is an empty time slot, the use of that time slot is considered (S254). As a result, for example, if it is found that the downlink time slot SD2 is vacant (S2
54YES), uplink time slot SU currently being communicated
Insert a control signal into 1 in a format that does not affect communication,
Time slots SD2 and SU2 for the wireless base station 30
(S255, FIG. 16). [0085] This signal is received by the radio base station 30 and the radio receiving circuit 35A, and is transmitted to the control unit 40 (S25
6). As a result of the investigation, the control unit 40 determines that the time slot S
After confirming that D2 and SU2 are unused and preparing to use them (S256), the downlink time currently in use is
Using slot SD1, a control signal is inserted in a manner that does not affect communication, and a notification is transmitted to radio base station 30 that the desired time slot SU2 is available (S25).
7). At the same time, the signal selection circuit group 3 of the wireless base station 30
The signal selection circuit 39-2 in 9A and the signal speed restoration circuit 38-2 in the signal speed restoration circuit group 38A are placed in a standby state,
Further, the signal allocation circuit 52-2 in the signal allocation circuit group 52A and the signal speed conversion circuit 5 in the signal speed conversion circuit group 51A
1-2 is similarly shifted to the standby state. The mobile radio 100 that has received the report signal from the radio base station 30 changes the timing signal of the timing generator 142 so that the time slots SD1 and SD2 are ready for reception and ready for transmission. uses time slots SU1 and SU2 to transmit the output of the telephone unit 101 to the wireless transmission circuit 132 via the signal division circuit 139 and speed conversion circuits 131-1 and 131-3.
-1 to the state of transmission (S259). On the other hand, at the wireless base station 30, the mobile wireless device 1
00 using time slots SU1 and SU2, and the mobile radio device 10
Since it is confirmed that the signal is 0 (S260), the call control unit 81 switches the switch SRA-1- of the switch group 81.
1, SRB-1-1, STA-1-1, STB-1-1
In addition to being in the on state, SRA-2-1,S
TA-2-1 is turned on (FIG. 4) and the call is continued (S261). Subsequent communications for both transmission and reception use two time slots for radio channel CH1 and one time slot for radio channel CH2.
It becomes a state in which slots are used, and it is possible to ensure the reception quality required for the system by combining the effects of transmitting and receiving diversity (in this case, the above-mentioned frequency diversity and the above-mentioned time diversity). [0088] Also, time diversity can be applied to the radio channel CH2 that is being used by the mobile radio device 100 in the same manner as described above. In the above explanation, it is assumed that calls are made and received using radio channels CH1 and CH2, but when only one radio channel is in use, and transmission and reception using multiple time slots within the same radio channel Time diversity and transmit/receive time diversity using time slots in separate radio channels can also be implemented as described above. [0089] Furthermore, although the above explanation deals with the case where the mobile radio device 100 takes the initiative when applying diversity, it can be similarly implemented when the radio base station 30 takes the initiative. be. [0090]Furthermore, instead of applying transmitting/receiving diversity after an incoming/outgoing call is started as described above,
It is also possible to apply diversity from the beginning,
This will be explained below. [0091] Taking the case where a call is made from the mobile radio 100 as an example, the uplink control signal at the time of the call is sent to the time slot S.
When transmitting to the wireless base station 30 using Un, a signal indicating that diversity is to be applied is included in the control signal. On the other hand, a command signal is added to the downlink channel from the radio base station 30 to use the synchronization signals included in the unused time slots, for example, SD1 and SD2 in the control signal. There is. By receiving this signal at the mobile radio device 10, the radio base station 30
In contrast, SD1 and SD2 in time slot SUn
Add a control signal indicating that you want to use mobile radio device 1.
This preparation is executed on the 00 side. Meanwhile, the radio base station 30 also prepares for reception in 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 device 100 transmits the transmission in the uplink time slots SU1 and SU2 to the radio base station 3.
If transmission is started in the downlink time slots SD1 and SD2 from 0, diversity can be applied from the start of the call. [0093] The case where the multiplicity of diversity using two series of time slots in one radio channel is double has been described above, but it is also possible to implement the case where the multiplicity is further increased. It is also possible to implement it in combination with frequency diversity using more radio channels. (4) Comparison of the diversity effect according to the present invention and the conventional method FIG. 17 shows the comparison between the diversity effect according to the present invention and the conventional method (
A comparison with carrier angle modulation or amplitude modulation is shown below. This content will be explained below. In transmitting/receiving diversity using the same radio base station 30 according to the present invention, since the location is the same, if the same channel and time slot are used, no diversity effect can be obtained unless space diversity is used. You will not be able to do so. In space diversity, unless the transmitting and receiving antennas are separated by an appropriate distance, the correlation between the antennas will not approach zero and a satisfactory effect will not be obtained. On the other hand, in the conventional method, when the same radio base station is used, an effect can be obtained when using different channels, and although there is a slight space diversity effect, when the same radio base station is used, - Although it is possible to use a slot (the expression "time slot" is not appropriate, since the radio channel is exclusively occupied, it can be said that one time slot and one channel) cannot be used in another time slot. From the above evaluation, it has been found that the transmitting/receiving diversity according to the present invention is characterized by the time slots used (by usage time). This is a type of time diversity, which will be explained in detail below. first,
This diversity has the following characteristics. i) When transmitting or receiving, it is possible to use the same receiving or transmitting circuit even if the carrier frequencies are different. ii) In a normal wireless system, signals are constantly being transmitted and received, so the transmitted signals within the same wireless device may mix into the receiving section, causing so-called intermodulation.
This system does not have such concerns, and there is no problem even if time diversity is used. iii) It is possible to change the time diversity method applied depending on the moving speed of the mobile object. That is,
In the case of high speed, time diversity within the same radio channel is used, and in the case of medium to low speed, time diversity with another radio channel is used. [0098] Here, i) and ii) are essential features of the TCM system and their explanation will be omitted, but as explained below, iii) differs depending on the radio frequency used in the system, so the general tendency is showed that. FIG. 18 shows the degree of effectiveness of applying the time diversity of the TCM method according to the present invention to each system currently in use in Japan or expected to be introduced in the near future. The basis for these evaluations is shown in FIG. FIG. 19 shows the relationship between the moving speed of the mobile radio device 100 and the half period of the Doppler frequency in each used frequency band. According to the same figure,
For example, at a relatively low frequency, such as a cordless phone,
In addition, when the moving speed is also low, it is necessary to make the transmission time difference of the TCM signal about the same as the half period in Fig. 19 in order to obtain the effect of time diversity. Below 10 m/sec, this value becomes 60 msec or more, indicating that it is difficult to use. On the other hand, quasi-microwave car phones use high frequencies and move at high speeds, so even at a speed of 10 m/sec, the half cycle is 9.4 msec, the signal delay time is small, and the same radio channel is used. Indicates that time diversity is available. The above is an example of the study, and if a similar study is performed for each system in FIG. 18, the results shown therein will be obtained. [0100] Effects of the Invention As is clear from the above explanation, by applying the present invention to a mobile communication system, the radio wave propagation characteristics due to the moving speed of the mobile radio device and the influence of the topography and features in its vicinity can be improved. The effects of the present invention are extremely significant because even if the system deteriorates, it is possible to apply frequency and time transmitting and receiving diversity on the system side, and it is now possible to communicate while always maintaining the communication quality required by the system. be.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a conceptual configuration diagram showing the concept of a system of the present invention. FIG. 2 is a circuit configuration diagram of an embodiment of a mobile radio device used in the system of the present invention. FIG. 3 is a circuit configuration diagram of an embodiment of a wireless base station used in the system of the present invention. FIG. 4 is a detailed circuit configuration diagram of a switch group that is a component of FIG. 3; 5 is a detailed circuit configuration diagram of a signal selection circuit group, a signal speed restoration circuit group, a signal speed conversion circuit group, and a signal allocation circuit group, which are the components of FIG. 3; FIG. FIG. 6 is a circuit diagram of another embodiment of a mobile radio used in the system of the present invention. FIG. 7 is a time slot structure diagram for explaining time slots used in the system of the present invention. FIG. 8 is a waveform diagram showing radio signal waveforms of time slots. FIG. 9 is a spectrum diagram showing spectra of a call signal and a control signal. FIG. 10 is a circuit configuration diagram for multiplexing audio signals and data signals. FIG. 11 is a spectrum diagram showing spectra of a call signal and a control signal. FIG. 12 is a flow chart showing the flow of the calling operation of the system according to the present invention. FIG. 13 is a flow chart showing the flow of the calling operation of the system according to the present invention together with FIG. 12; FIG. 14 is a flow chart showing the flow of the calling operation of the system according to the present invention together with FIGS. 12 and 13; FIG. 15 is a flow chart showing the flow of operations when diversity is applied to the system according to the present invention. FIG. 16 is a flowchart showing the operation flow when diversity of the system according to the present invention is applied together with FIG. 15;
It is a chart. FIG. 17 is a diversity effect diagram for comparing diversity effects between a system according to the present invention and a conventional system. FIG. 18 is a diversity effect diagram when the system according to the present invention is applied to various types of use. FIG. 19 is a half-period diagram of the Doppler frequency at various frequencies and moving speeds in the system according to the present invention. [Description of symbols] 10 Telephone network 20 Gateway exchanges 22-1 to 22-n Communication signal 30 Radio base station 31 Signal processing section 32 Radio transmission circuit 35 Radio reception circuit 38 Signal speed restoration circuit group 39 Signal selection circuit group 39-1 ~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 allocation circuit group 52-1 ~ 52-n Signal allocation circuit 71 Communication quality monitoring section 81 Communication path control section 82 ID identification storage section 83 Switch group 91 Digital encoding circuit 92 Multiplex conversion circuit 100, 100-1 to 100-n Mobile radio device 101
Telephone unit 120 Reference crystal oscillator 121-1 to 121-4 Synthesizer 122-1 to
122-4 Switch 123 Transmission/reception intermittent controller 131 Speed conversion circuit 132 Wireless transmission circuit 133 Transmission mixer 134 Transmission section 135 Wireless reception circuit 136 Reception mixer 137 Receiving section 138 Speed restoration circuit 139 Signal division circuit 141 Clock regenerator 152 Signal mixing circuit 171 Communication quality monitoring unit 182 ID information verification storage unit

Claims (2)

[Claims] 1. Each wireless base means (30) each covering a plurality of zones to form a service area;
each mobile radio means (100) using a radio channel carrying temporally compressed delimited signals in time slots of a frame structure for moving across said plurality of zones and communicating with said radio base means; and barrier exchange means (20) for exchanging communications between the radio base means and the mobile radio means, wherein the radio base means uses a plurality of time frames included in each frame.・
a plurality of sets of signal speed conversion means (51) for converting the speeds of signals divided by slots into high speeds, respectively; and a plurality of sets of signal speed converting means (51) for converting the speeds of signals divided by slots into high speeds, and allocation to signals divided by a plurality of time slots included in each frame converted to high speed a plurality of sets of signal allocation means (52) for serially outputting signals in time series at specified timings; and a plurality of wireless transmission means (52) for transmitting the output of the signal allocation means as radio channel radio waves.
32), and each receives a plurality of wireless channel radio waves that are serially sent in chronological order at timings assigned to signals separated by a plurality of time slots included in each frame converted to high speed. a plurality of radio reception means (35) for receiving the outputs of the plurality of radio reception means, and a signal separated by the plurality of time slots included in each frame serially transmitted. a plurality of signal selection means (39) for converting the signal into parallel and outputting each signal; and receiving each signal from the plurality of signal selection means, converting it to a low speed, restoring the signal, and outputting each signal. Multiple sets of signal speed restoration means (
38) and a communication quality monitoring means for monitoring the quality of communication between the mobile radio means and outputting communication quality information (
71) and at least one radio channel and at least one time slot used for transmission and reception in the radio transmitting means and the radio receiving means in coordination with the mobile radio means based on the communication quality information. control means (40) for instructing the plurality of sets of signal rate conversion means to apply one signal to be communicated to at least one time slot according to instructions of the control means in each frame; and communication path control means (81,
83) A radio base station for time division communication in mobile communication, comprising: 2. Each wireless base means (30) each covering a plurality of zones to form a service area;
each mobile radio means (100) for moving across said plurality of zones and communicating with said radio base means using at least one radio channel; and communication between said radio base means and said mobile radio means; In mobile communication using a barrier exchange means (20) for exchanging a plurality of radio waves included in each frame in each of at least one radio channel radio wave sent from the radio base means, a plurality of radio receiving means (135, 121-) for receiving signals of at least one time slot separated by time slots;
1, 121-2, 122-1, 122-2, 123) and converts it to a low speed signal included in the at least one time slot in each frame. speed restoration means (138) for restoring the signal to a continuous signal; and speed conversion for dividing the signal to be transmitted and performing speed conversion at a high speed in at least one time slot separated by a plurality of time slots included in each frame. a plurality of speed conversion means (131) for
The outputs of the plurality of speed converting means are
A plurality of radio transmitting means (one
32,121-3,121-4,122-3,122-
4,123), communication quality monitoring means (171) for monitoring the quality of communication with the radio base means and outputting communication information, and adjusting with the radio base means based on the communication quality information. A mobile radio for time-division communication in mobile communication, comprising control means (140) for instructing at least one time slot to be used for transmission and reception in the radio transmission means and the radio reception means.