JPH02254828A - Time division communication method in mobile object communication - Google Patents

Abstract

PURPOSE:To attain a call to a mobile radio equipment desiring a new call and to realize a system where the degree of utility of the frequency is high by using an idle slot in a time slot subjected to time division in each radio channel when all radio channels are busy. CONSTITUTION:When lots of mobile radio equipments 100 exist in a service area and a radio base station 30 exist, one radio channel is split into plural time slot series timewise to allow an optional number of mobile radio equipments 100 to communicate with the radio base station 30, one or plural time slot series are selected and the system capable of communication is built up by using the slot. When other mobile radio equipment 100 sends a signal to the radio base station 30 while one mobile radio equipment is in busy with the radio base station 30, one idle time slot is given in a radio channel already in use to the mobile radio equipment 100 desiring the communication such as a the request of new position registration or a call to attain communication with the radio base station 30.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a time-division communication method for a wireless communication channel in mobile communication employing a small zone system. More specifically, a wide service area is constituted by service zones each controlled by a large number of wireless base stations,
Each radio base station is provided with a number of radio channels from among the many radio channels provided to the system, and is used to locate one of the many mobile radios within its service area.
While one of the mobile radios is communicating by setting up a radio link with at least one opposing radio base station, another mobile radio is communicating with one of the radio channels being used by the mobile radio with which it is communicating.
When a mobile radio requests to communicate using one or more channels, the communication between the other mobile radio and the radio base station can be established 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 method that allows transmitting and receiving diversity of a plurality of wireless channels, which makes it possible to set up independent wireless lines by sharing at least one wireless channel.

[Conventional technology] In mobile communications that apply the conventional small zone method,
For example, it is used in the automobile system of NTT (Nippon Telegraph and Telephone Corporation), which is in commercial service. This is number 10
This will be explained using figures. A plurality of radio channels are assigned to a certain radio base station 13 in order to simultaneously communicate with a plurality of mobile radio devices 15 installed in each of the many automobiles that exist within a zone 14 that is its service area. . On the other hand, each mobile radio device 15 has one of the many radio channels.
A function that allows selective use of one channel (referred to as multi-channel access) is provided. When communicating with the radio base station 13, the mobile radio device 15 uses a control signal to contact the radio network control station 12 via the radio base station 13, which determines the use of radio channels of a large number of radio base stations 13. , determines the call channel number to be used for communication according to the instructions from there, and transmits it to the telephone network 10 via the exchange 11 including the switch SW.
The system is configured to communicate with subscribers.

[Problem to be Solved by the Invention] In this case, if the number of radio channels provided to a certain radio base station for calls is 10, the number of radio channels provided to a certain radio base station for calls is 10, It is possible to allocate separate wireless channels to communication requests, so it is possible to make a call, but for the call request from the mobile wireless device that made the 11th request, it is possible to allocate separate wireless channels. Unable to make calls (lost call) due to lack of wireless channel
It became. The above was an example of using a wireless channel to transmit an analog signal, but even when audio is digitally modulated, single channel per carrier (
Sinale Channel per Carrie
Even in a system where r>5 cpc, that is, a system in which one telephone (communication) signal is carried and transmitted on each carrier wave, the above-mentioned unresolved problem still exists.

[Means for solving the problem] A transmission signal (baseband signal) is divided into predetermined time intervals and stored in a memory circuit, and when read out, the signal is read out at a speed n times faster than the speed at which it is stored in the memory circuit. Read at a given time slot and
In order to angle-modulate or amplitude-modulate a carrier wave with a signal accommodated by a slot sequence and transmit and receive it intermittently, a reception mixer that is built in a mobile radio device and a radio base station and communicates with each other is used. A switch circuit is provided for a radio receiving circuit having a radio receiving circuit, a radio transmitting circuit having a transmitting mixer, a synthesizer applying voltage to the receiving mixer of the radio receiving circuit, and a synthesizer applying voltage to the transmitting mixer of the wireless transmitting circuit, and outputs of the synthesizers applying voltage to each. and synchronizes this intermittent state in both transmission and reception, and synchronizes the same intermittent transmission and reception with that of the mobile radio device for the radio base station communicating oppositely, and on the receiving side, the above-mentioned predetermined In order to extract only the signals accommodated in the time slot series, the radio reception circuit is opened and closed to receive the signals, and the signals obtained by iI modulation are stored in a memory circuit, and when read out, the signals are stored in this memory circuit. speed n
By reading at a speed that is one-fold slower, it is possible to reproduce the baseband signal, which is the original signal that was transmitted.
We constructed a system that includes a wireless base station for mobile communication equipped with multiple radio devices that can transmit and receive signals, and a mobile radio device.

As a result, even if all wireless channels given to the system are in use, new calls cannot be made if there are empty slots that are not used for communication within the time slots divided into time slots for each wireless channel. It is now possible to make calls to desired mobile radios, making it possible to realize a system that makes efficient use of frequencies.

[Operation] A radio base station and a large number of mobile radio devices exist within its service area, and in order for any number of mobile radio devices to be able to communicate with the radio base station, one radio channel is The system is divided into a plurality of time slot series, and a system has been constructed in which one or more of these time slot series can be selected and used for communication. If one mobile wireless device is communicating with a wireless base station and another mobile wireless device sends a message to this wireless base station, a message will be sent to the mobile wireless device that newly requests location registration or makes a call. If the radio channel is already in use,
Given an unused one of the time slot series,
By enabling communication with the wireless base station,
The communications of the plurality of sets do not interfere with each other,
In addition, it has become possible to execute communications without adversely affecting own communications.

Furthermore, when communication traffic is slow, the same communication signal is added to one time slot sequence of each of different radio channels, and the radio base station transmits this. The signals are received by a mobile radio equipped with multiple receivers so that the signals can be received simultaneously, mixed at the input of each telephone (terminal section), and the transmitted signals from the mobile radio are received by multiple transmitters. This enables transmission using multiple radio channels in one time slot sequence.

Furthermore, by selecting a plurality of time slot sequences from among many time slot sequences set within one wireless channel, it is possible to improve communication quality through diversity transmission and reception. In this case, multiple time points within the same radio channel
The same communication signal is transmitted from a radio base station in a slot series, received by a mobile radio, and mixed at the telephone (terminal) input, and the transmission signal from the mobile radio is transmitted at multiple times. Diversity transmission and reception was made possible by transmitting in a slot sequence, receiving this at a wireless base station, and mixing it.

Furthermore, by using the two types of diversity described above in combination, it is possible to perform diversity transmission and reception with a large diversity effect.

[Example] Fig. 1A, Fig. 1B, and Fig. 1C (Fig. 1C-1, Fig. 1C-2, and Fig. 10-3 are hereinafter collectively referred to as abbreviations) illustrate an embodiment of the present invention. 1 shows a system configuration for explaining an embodiment.

In FIG. 1A, 10 is a general telephone network, and 11 is an exchange for connecting the general telephone included in the telephone network 10 and a wireless system. 20 is a gateway exchange, and a plurality of wireless base stations 30-1, 30-2 . −．
30-n to many mobile radios and the general telephone network 10
It connects telephones accommodated in Each radio base station 30-1 to 30 is controlled by a communication control unit 21, an S/N monitoring unit 25 for monitoring the signal-to-noise ratio received at each radio base station 30, and a communication control unit 21.
The switch group 23 necessary for switching the communication path to establish the connection between -n and the exchange 11 and the ID (identification number) of the mobile radio device that registers the location with each radio base station 30 and communicates with it. ID identification storage unit 24 for identifying and storing the ID
and are included. This switch group 23 includes switch groups 23-1 to 23-n for each wireless base station 30-1 to 30-n.
Contains n.

Here, between the barrier switch 20 and the wireless base station 30,
There are transmission lines for transmitting communication signals of communication channels CH1 to CHn and communication signals 22-1 to 22-n including control signals, and these transmission lines are connected to the signal processing unit 31 of each radio base station 30. It is connected.

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

Received signals such as control signals and call signals 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. -1, and the communication signal that is its output is
The signals are respectively input to two speed restoration circuits 138-1 and 138-2 and a clock regenerator 141. The clock regenerator 141 regenerates the clock from the received signal and transmits it to the speed restoration circuit 138-1, 138-2 and the control unit 14.
0 is applied to the timing generator 142.

The speed restoration circuits 138-1 and 138-2 restore the speed (pitch in the case of an analog signal) of the compressed and segmented communication signal in the received signal and convert it into a continuous signal to the signal mixing circuit 152 and the control unit 140. The signals applied to the telephone and mixed by the signal mixing circuit 152 are input to the telephone section 101 and the ID information verification storage section 182.

The communication signal output from the telephone unit 101 is divided by a signal division circuit 139, and then sent to two speed conversion circuits 131-
1.131-2 divides the communication signal at predetermined time intervals, increases the speed (pitch in the case of analog signals) (compresses), and transmits it on two channels. 134-1, a transmission mixer 133-2, and a transmission section 134.
-2, and the transmission signal is sent out from the antenna section and received by the wireless base station 30.

In the timing generator 142, the transmission/reception intermittent controller 123. Speed conversion circuit 131-1, 13
1-2. It supplies necessary timing to the radio reception circuit 135-1, 135-2 and the speed restoration circuit 138-1 and 138-2.

Further, the clock from the clock regenerator 141 is also applied to speed conversion circuits 131-1 and 131-2.

This mobile radio device 100 further includes a synthesizer 121.
-1 to 121-4, selector switches 122-1 to 122-4, and selector switches 122-1 to 122
-4 and a timing generator 142 are included, and the synthesizers 121-1 to 121-4 and the transmitting/receiving intermittent controller 123 can transmit and receive two channels simultaneously. It is controlled by the control unit 140 as follows.

A reference frequency is supplied from a reference crystal oscillator 120 to each synthesizer 121-1 to 121-4. 2
Frequency diversity is enabled by transmitting and receiving two channels simultaneously.

The ID information collation storage unit 182 receives identification information (ID) transmitted from the wireless base station 30 from the signal mixing circuit 152, collates it with the stored content under the control of the control unit 140, and stores it as necessary. .

1C-1 to 10-3 respectively show the overall configuration of the radio base station 30, a specific example of the switch group 83 which is a component thereof, and a signal speed restoration circuit group 38. Signal selection circuit group 39. Signal speed conversion circuit group 51. A specific configuration example of the signal assignment circuit group 52 is shown. Gateway exchange 20
The n-channel communication signals @ 22-1 to 22-n are connected to a signal processing unit 31 forming an interface via a transmission path.

Now, as shown in FIG. 10-1, the communications @22-1 to 22-n sent from the barrier exchange 20 are input to the signal processing section 31 of the wireless base station 30. The signal processing section 31 is equipped with an amplifier for compensating for transmission loss, and also performs so-called 2-wire to 4-wire conversion. That is, the input signal and the output signal are mixed and separated, and the input signal from the barrier switch 20 is sent to many switches 5RA-1-1, 5RA-1-2, . . . as shown in FIG. 1C-2. 5RA
-1-n, 5RA-2-1, 5RA-2-2゜・, 5R
A-2-n, ・, ・, 5RA-n-1゜5RA-n
-2,..., 5RA-n-nl and 5RB-1-1,5R
B-1-2,..., 5RB-1-n, 5RB-2-1
,5RB-2-2,-.

5RB-2-n, ・, -, 5RB-n-1, 5RB-
n-2,-,5RB-n-n, and 5TA-1-1,
5TA-1-2, ., 5TA-1-n.

5TA-2-1, 5TA-2-2,..., 5TA-2
-n,-,-,5TA-n-1,5TA-n-2,-
, 5TA-n-n, and 5TB-1-1, 5TB-1-2
,-,3TB-1-n,5TB-2-1,5TB-2-
2,-,5TB-2-n,-...-,5TB-n-1,
The signal speed conversion circuit groups 51A, 51B (
(see Figure 10-3). Further, the output signals from the signal speed restoration circuit groups 38A and 38B, the details of which are shown in FIG. 10-3, are sent to the signal processing unit via the switch group 83 as shown in FIGS. 10-2 and 10-1. At step 31, the signal is transmitted to the barrier exchange 20 using the same transmission path as the input signal. Here, the switch group 83 is a transmission switch 5TA-
1-1 to 5TA-n-n.

5TB-1-1 to 5TB-n-n, reception switches 5RA-1-1 to 5RA-n-n, 5RB-1-1 to 5
It is roughly divided into RB-n-n, but all of them have a communication path control section 8.
1, the switch group 83 is opened and closed to achieve the desired purpose, and operates to enable transmitting and receiving 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
The switch group 83 is opened and closed according to commands from the control unit 40 to control the communication path, and the communication path control unit 81 also has the function of providing information and requesting control to the control unit 40. Among the above, the input signal from the barrier switch 20 passes through the switch group 83 and then passes through many signal speed conversion circuits 51-1 to 51-1.
Signal speed conversion circuit group 51A each including groups 51-n
, 51B, and the speed (
Pitch) undergoes conversion. In addition, signals transmitted from the wireless base station 30 to the barrier switch 20 are transmitted to the wireless receiving circuits 35A and 3.
5B outputs to signal selection circuit groups 39A and 3, respectively.
Via 9B, signal speed restoration circuit groups 38A and 38B
The signal is input to the signal processing section 31 , and after being subjected to speed (pitch) conversion, it passes through the switch group 83 and is input to the signal processing section 31 .

Now, the control or call signal outputs of the radio receiving circuits 35A and 35B are input to signal selection circuit groups 39A and 39B, respectively, 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 After being inputted to the communication signal processing section 31 via 83 and subjected to 4-wire to 2-wire conversion, the output is sent to the barrier switch 20 as communication signals 22-1 to 22-n.

Next, the functions of the signal speed conversion circuit groups 51A and 51B will be explained.

By storing input signals such as audio signals and control signals divided into a certain length of time in a storage circuit, and changing the speed when reading them out, for example, reading them out at a speed 15 times faster than when they were stored, the signals can be stored. 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, COD (
Charge Coupled [)evice)
, B B D (BucketBrigade [
)evice) can be used, and the memory used in television receivers and tape recorders that compress or expand the time axis of conversations can be used (
Reference: Koita et al. “Tape recorder that compresses/expands the time axis of conversation” Nikkei Electronics, July 26, 1976, pp. 92-133).

The circuits using COD and BBD exemplified in the signal speed conversion circuit groups 51A and 51B can also be used as they are in the signal speed restoration circuit groups 38A and 38B, as described in the above-mentioned literature, and in this case, the clock This can be achieved by receiving a timing signal from a timing generator 42 that generates timing using a clock from a generator 41 and a control signal from a control unit 40, and making the reading speed slower than the writing speed.

The control or audio signals output from the barrier exchange 20 via the signal processing section 31 are sent to signal speed conversion circuit groups 51A and 5.
1B, and after being subjected to speed (pitch) conversion processing, it is applied to signal allocation circuits 'u52A and 52B that allocate signals for each time slot. The signal allocation circuit groups 52A and 52B are buffer memory circuits that store one section of high-speed signals outputted from the signal speed conversion circuit groups 51A and 51B, and are timing generation circuits that are given according to instructions from the control section 40. With the timing information from 42, the signal in the buffer memory is read and transmitted to the wireless transmission circuit 32. When viewed in terms of channels, this timing information is chronologically arranged in series without overlap, and when all control signals or call signals described below are implemented, it becomes as if it were a continuous signal wave. .

Another embodiment of a mobile radio, 100B, is shown in FIG. 1D. Here, the mobile radio device 10 shown in FIG. 1B
The difference in configuration from No. 0 is that four speed restoration circuits 138-1 to 138-4 and four speed conversion circuits 131-1 to 131-4 are provided. To explain its operation, the output of the receiving section 137-1 of the radio receiving circuit 135-1 is applied to both speed recovery circuits 138-1 and 138-3, and the The same communication signal is received using diaperity. 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, which receive the same communication signal using two different time slots in one other wireless channel. . Therefore, the outputs of the four speed restoration circuits 138-1 to 138-4 are transferred to the signal mixing circuit 1.
By mixing at 52, both time and frequency diversity effects can be obtained. In order to obtain such an effect, the control unit 140B performs somewhat different control than the control unit 140 in FIG.
A device with the same function can be used in B.

Radio transmitting circuits 32A and 32B of the radio base station 30 (since both have the same function, 32 is simply referred to as 32 in the following)
It is called. ) and the compressed signals of the radio receiving circuits 35A and 35B (hereinafter simply referred to as 35 as they have the same function) are shown and explained in FIGS. 2A and 2B. do.

The output signal of the signal speed conversion circuit group 51 (51A and 51B have the same function, so they are simply referred to as 51) is output from the signal assignment circuit group 52 (52A and 52B have the same function, so they are simply referred to as 52, and other components ) and are given time slots in a predetermined order. SD1, SD2, . . . , SDn in FIG. 2A (a) indicate that the speed-converted communication signals are allocated to each time slot.

Here, in one time slot, there is a synchronization signal as shown in the figure! IJt[l signal or speech signal is accommodated. If a call signal is not implemented, only the synchronization signal added by the call path control section 81 is used, and an empty slot signal is added to the call signal portion. In this way, as shown in FIG. 2A (a), in the radio transmitter circuit 32, signals forming one frame in time slots SD1 to SDn are applied to the modulation circuit.

This time-series multiplexed signal is subjected to amplitude or angle modulation in the radio transmission circuit 32, and then is sent out into space from the antenna section.

When making or receiving a telephone call, the wireless base station 30
Regarding the transmission of control signals between the mobile radio t1100 and the mobile radio t1100, it is possible to use either within the speech signal band or outside the speech signal band.

Figure 3A shows these frequency relationships. That is, the same (a
) is an example of an out-of-band signal, and as shown in the figure, the low frequency side (250-fz) or the high frequency side (3850H2) 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).

These control signals are generated in the control unit 40, as well as control signals from the barrier switch 20 and the communication path control unit 8.
The control signal from 1 is relayed or converted by the control unit 40 to be created and sent out.

The control signal sent from the mobile radio device 100 is received by the radio receiving circuit 35, processed by the control section 40, and sent to the communication path control section 81 and the barrier exchange 20 as necessary.

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

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

The above 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 to transmit. The circuit configuration of is shown in FIG. 3C. FIG. 3C shows an audio signal digital encoding circuit 9.
This is an example of a case in which the data signal is digitized at 1, multiplexed with a data signal by a multiplex conversion circuit 92, and applied to a modulation circuit included in the wireless transmission circuit 32.

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

On the other hand, the signal sent from the mobile radio device 100 is received by the antenna section of the radio base station 30 and input to the radio reception circuit 35. 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. A case where the data is sent using a wireless channel will be explained. FIG. 2A (b) schematically shows this upstream input signal.

That is, time slot SU1. SU2. ...S
un is mobile radio 1100-1.100-2°...,
Radio base 830 from 100-n (e.g. 30-1>
Indicates the transmitted signal to the destination. Also, each time slot SUI,
SU2. ..., to show the details of sun, 2nd A
As shown in the lower left part of Figure (b), it consists of a synchronization signal and a control signal or a call signal. However, if the distance between the radio base station 30 and the mobile radio device 100 is small or depending on the signal speed, it is possible to omit the synchronization signal.

Roughly speaking, the waveform of the radio carrier wave of the above-mentioned uplink radio signal within a time slot is schematically shown as shown in FIG. 2B (C>).

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

A timing signal from a timing generation circuit 42 that generates a predetermined timing is applied to the signal selection circuit group 39 according to a control signal instruction from the control section 40, and a synchronization signal and a control signal are generated for each time slot SU1 to SU5tJn. The signal or speech signal is separated and output. Each of these signals is
The signal is input to the signal speed restoration circuit group 38. This circuit has the function of inversely converting the speed conversion circuit 131 (FIG. 1B) in the mobile drone 100 on the transmitting side, so that the original signal is faithfully generated and the barrier is exchanged! It will be sent to a20.

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

As shown in FIG. 1C-1, the control signal from the control unit 40 is sent to the radio transmitting circuit 3 in parallel with the output of the signal allocation circuit group 52.
Added to 2. However, depending on the size of the speed conversion rate, the signal allocation circuit group 5
It is also possible to add the output of 2 to the wireless transmission circuit 32.

Next, the mobile radio 11100 also has a circuit configuration that can handle the case where one communication path among the functions of the radio base station 30 is transmitted and received over two channels, as shown in FIG. 1B. Original signal Tatoeha call signal (0,3
KH2~3.0Kl-fZ) is signal speed conversion circuit group 5
1 (FIG. 1C), the frequency distribution on the output side is shown in FIG. 3B. That is, if the audio signal is converted 15 times as described above, the frequency distribution of the signal will be expanded to 4.5 KHz to 45 KHz as shown in FIG. 3B. The figure shows a case where the control signals are simultaneously transmitted using the lower frequency band of the call signal. Among these signals, the control signal (0, 2
~4.0KH2> and one call signal (4,5~45KH
z) is the time slot,
For example, suppose that it is accommodated in SDl. Other time/
The same applies to the call signals accommodated in slots SD2 to SDn.

That is, time slot sD; <i=2°3,
-, n) accommodates a control signal (0,2~4.0KH2>) and a communication signal CHi (4,5~45KHz). However, the signals within each time slot are arranged in chronological order. Therefore, signals in more than one time slot at a time are never applied to the wireless transmitter circuit 32 at the same time.

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

f > 2 f H ep On the other hand, in digital signals, audio is usually digitized at a speed of about 64 kb/s, so read by raising the scale on the horizontal axis in Figure 3B, which explains the case of analog signals, by about one digit. Although necessary, the relationship in the above equation also holds true in this case.

Further, the control signal input from the mobile radio device 100 to the radio base station 30 is input to the radio reception circuit 35, but a part of the output is input to the control unit 40, and the other part is input to the signal selection circuit group 39. The signal is sent to the signal speed restoration circuit group 38 via the signal speed restoration circuit group 38. After the latter control signal undergoes a speed conversion (conversion to a low speed signal) that is completely opposite to that at the time of transmission, it becomes the same signal speed as that used in the general telephone network 10 and is transmitted via the signal processing section 31. It is sent to the barrier exchange 120.

Next, the application of the location registration one-launch/arrival floating operation and transmission/reception diversity of the system according to the present invention will be explained by taking the case of an audio signal as an example.

(1) In the home area where the location-registering mobile radio 100 is permanently installed, or in the roam area which is an area within the service other than the home area, the gateway switch 20 and the surrounding wireless base stations 30-1 to 30-30 are already connected. -n is operating, the power switch of the mobile radio 100 is turned on,
When the operation starts, the first thing that is performed is the location registration operation.

The flow of this location registration operation is shown in FIG. 4 and will be explained.

When the power switch of the mobile radio 100 is turned on, the first
In the wireless receiving circuit 135 in Figure B, the downlink (wireless base station 30
→Mobile radio 100) Radio channel (channel CH1,
and CH2). If the system is provided with more than two radio channels, 1) two radio channels exhibiting the highest and second highest received input fields; ii) as dictated by control signals contained in the radio channels; Radio channel iii) Channels with empty time slots among the time slots in a radio channel, etc., enter the reception state of radio channels (hereinafter referred to as channels CHI and CH2) according to the procedure defined in the respective systems. This is possible by capturing the synchronization signal within the time slot SDi shown in FIG. 2A(a). The control unit 140 sends a control signal to the synthesizer 121-1 to generate local frequencies that enable the synthesizer 121-1 to receive the radio channel CH1 and the synthesizer 121-2 to receive the radio channel CH2. Synthesizer 121-
1 side, the switch 122-2 is the synthesizer 121-2
They are fixed on each side.

Therefore, the control unit 140 starts sending out the location registration signal. First, synthesizer 121-3 in FIG. 1B receives a control signal from control unit 140 to generate a local oscillation frequency that enables transmission of wireless channel CH1, and synthesizer 121-4 generates a local frequency that enables transmission of wireless channel CH2. However, it is assumed that speed restoration circuit 138-1 and speed restoration circuit 138-2 are already in operation.

Next, the location registration control signal output from the telephone unit 101 is sent out using radio channels CH1 and CH2.

However, speed conversion circuit 131-1 and speed conversion circuit 1
It is assumed that 31-2 is already in operation.

Now, the control signal for the above radio channel CH1 or CH2 uses the frequency band shown in FIG. 3A (b), and is transmitted using, for example, time thrower 1 to Sun (S201, Figure 4).

In the following explanation, the radio channel CH1 will be explained.

This is because the same operation as that of CH1 proceeds for radio channel CH2 as well.

Also, depending on the system, one wireless channel may be used.
A location registration signal may be sent using only a channel. In this case, the configuration of the mobile radio device 100 becomes simple and economical. In other words, in FIG. 1B, only the radio receiving circuit 135-1 is connected to 1,1
35-2 can be omitted, the wireless transmission circuit can be made only 132-1, and 132-2 can be omitted. however,
Sufficient attention must be paid to reliability during signal transmission.

Now, the transmission of the location registration signal from this mobile radio device 100 is limited to only the time slot Sun, and is sent in bursts, and no signal is transmitted during other time slots, so it will not adversely affect other communications. . However, if the speed of the control signal is relatively slow or the amount of information in the signal is large and cannot be accommodated in one time slot, the same time slot of the next frame will be displayed after one frame or roughly. - Transmitted using slots.

Specifically, the following method is used to capture the time slot Sun. As shown in FIG. 2A (a), the control signal transmitted from the radio base station 30 includes a synchronization signal and a subsequent control signal, and the mobile radio device 100 receives this signal to perform frame synchronization. becomes possible.

Roughly speaking, this control signal includes control information such as currently used time slots and unused time slots (empty, time slot display). Depending on the system, the time slot sor (+=1.2°...
n) may only contain synchronization and speech signals when they are being used by other communications; By receiving this control signal, mobile radio 1100 can know which time slot should be used to transmit the location registration signal.

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

In other systems, there may be no empty slot indication in any of the time slots, in which case the following audio multiplex signals SD1, SD2 . ..., 5
It is necessary to search for the presence of Drl 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 methods described above, determines in which time slot it should transmit the location registration control signal. It is possible to make a judgment including the transmission timing.

Therefore, assuming that the time slot Sun for uplink signals is an empty slot, it is decided to use this empty time slot, and a control signal for location registration is sent to the radio base 130.
It is possible to extract the necessary timing from the response signal from the controller and send out a burst control signal.

If another mobile wireless device makes a call to the location registration device at the same time, the location registration signal will not be properly transmitted to the wireless base station 30 due to call collision, and the operation will have to be restarted from the beginning. , this probability is kept to a sufficiently small value when viewed as a system. If call collisions are to be significantly reduced, the following method may be used. If the mobile radio device 100 finds an empty time slot in which it can register its location, it does not use the entire time slot, but rather uses only the first half 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. In other words, the portion of a time slot used as a location registration or calling signal is divided into several types, and this is used to classify a large number of mobile wireless devices into groups, and each group is given a This is a method of giving a time zone. Another method is to create many types of frequencies for control signals, group a large number of mobile radios, and give these to each group. According to this method, even if control signals of different frequencies are transmitted simultaneously using the same time slot, no interference will occur at the radio base station 30. The above two methods may be used separately, or when used together, the effects will increase synergistically.

Now, suppose that the location registration control signal from the mobile radio device 100 is successfully received by the radio base station 30-1 and the ID (identification number) of the mobile radio device 100 is detected (3202>, the control unit 140 Remember the ID of the radio 1008
203>, check whether the reception quality is above a certain value 3204), and if it is above a certain value (S204YES)
), sends a location registration request signal for the mobile radio device 100 to the gateway exchange 20 together with reception quality data (S205
).

The number of radio base stations 30 described above is not necessarily limited to one, and other radio base stations 30-2, 30-3, etc. that have received the location registration signal of the mobile radio device 100 perform the same operation. This registration request signal was received from a plurality of wireless base stations 30 (
3206) The gateway exchange 20 registers the location including the reception quality (S207).

Similarly, in the barrier switch 20, a plurality of wireless base stations 30-1
~30-n registers that the reception quality and location are stored. When this registration work is completed, a registration completion signal is sent to each wireless base station 30 (S208).

Upon receiving this registration completion signal (3209), each radio base station 30 transfers it to the mobile radio device 50 using a downlink control channel (3210). This method is as follows.

That is, in the wireless base station 30-1, the mobile wireless device 100
The time slot S of the wireless channel CH1 is
Dn is used to notify that the location registration has been completed by a downlink control signal. A similar completion signal is also sent from the wireless base station 30-2, 30-3, etc. in the same time slot SD as above.
n, transmitted at the same time or several frames later. In this case, if interference prevention measures are in place, the messages will be sent at the same time, but if not, they will be sent with a time difference.

Registration completion signal received (3211>Mobile radio 100
inspects the received content and stores the ID (identification number) of each registered wireless base station 30 in the ID roam area information verification storage unit 54 (3212) The location registration operation is completed by the above operation, Waits for an incoming call.

The location registration method according to the present invention explained above is similar to the conventional NT
This is significantly different from methods such as T's car phone system. That is, in the conventional system, a dedicated control channel has been used to transmit and receive control signals necessary for location registration or for making and receiving calls. This was extremely natural in order to increase channel usage efficiency. However, in the present invention, it is not necessarily necessary to use the conventional method, and it is possible to obtain channel usage efficiency equal to or higher than that of the conventional method. This is because in the conventional system, a call channel was dedicated to one person's calls and could not be used by other people, but with the present invention, this channel can be shared by many people.

(2) Call origination from mobile radio device 100 This will be explained using the flowcharts shown in FIGS. 5A and 5B.

The power of the mobile radio device 100 is turned on,
Moreover, location registration has also been completed. Then, in the same manner as already explained in the section (1) location registration, the wireless channels (hereinafter referred to as channels CHI and CH2) are entered into a receiving state according to the procedure defined in the system. This is the time slot S shown in Figure 2A(a).
This is possible by capturing the synchronization signal within Di. The control unit 140 sends a control signal to the synthesizer 121-1 to generate a local frequency that enables the radio channel CH1, f:i and the synthesizer 121-2 to receive the radio channel CH2, and also sends a control signal to the switch. 1
22-1 is the switch 12 on the synthesizer 121-1 side.
2-2 are tilted and fixed on the synthesizer 121-2 side.

Therefore, when the handset of the telephone unit 101 is off-hook (starting a call) (3201, FIG. 5A), the synthesizer 121-3 in FIG. 1B can transmit on the wireless channel CH1, and the synthesizer 121-4 can transmit on the wireless channel CH2. The control unit 140 generates a control signal that generates the local oscillation frequency.
receive from

However, speed restoration circuit 138-1 and speed restoration circuit 1
It is assumed that 38-2 is already in operation.

Next, the calling control signal output from the telephone section 101 is sent out using the radio channels CH1 and CH2. However, speed conversion circuit 131-1 and speed conversion circuit 131
-2 is already in the operating state.

Now, the control signal for the above radio channel Cl-11 or CH2 uses the frequency band shown in FIG. 3A (b), and is transmitted using, for example, the time slot Sun.

In the following explanation, the radio channel CH1 will be explained.

This is because the same operation as that of CH11 proceeds for the radio channel CH2 as well.

The transmission of this control signal is limited to time slot Sun, and is sent in bursts, and no signal is transmitted during other time slots, so it does not adversely affect other communications. However, if the speed of the control signal is relatively slow or the amount of information in the signal is large and cannot be accommodated in one time slot, the same time slot of the next frame will be displayed after one frame or roughly. - Transmitted using slots. The method of capturing time slot Sun is the same as described in the section (1) location registration.

Assuming that the call control signal from the mobile radio m1oo is successfully received by the radio base station 30 and the ID (identification number) of the mobile radio 100 is detected (3202), the control unit 40 determines whether the mobile radio is currently vacant or not. Search for time slots. The time slot given to the mobile radio device 100 may be Sun, but a search is performed just to be sure. It is mobile radio 1
In addition to 00, this is also used to accommodate simultaneous calls from other mobile radios, and to provide time slots specific to service types and service categories.

As a result, if the time slot SD1 is vacant, for example, the time slot SDn of the radio channel CHI is used for the mobile radio device 100 to transmit the time slot uplink (mobile radio device 100→radio base station 30) by the downlink control signal. ) SUl.

and instructs to use the corresponding downlink (radio base station 30→mobile radio device 100) SDI (S203
>. Mobile radio tilo accordingly.

Then, the state shifts to a state where reception is possible at the designated time slot SDI, and the downstream time slot SD1
5L11 (see FIG. 2A(b)), which is the time slot for the uplink radio channel corresponding to the time slot, is selected. At this time, the control unit 140 of the mobile station 811100 operates the transmission/reception intermittent controller 123 and starts operating the switches 122-1 and 122-2 (3204>. At the same time, the slot switching completion report is sent to the uplink time slot S
5205>, and waits for a dial tone (3206>).

Time slot SU of the radio carrier of this upstream radio signal
The state of No. 1 is schematically shown in FIG. 2B (C). In addition to the time slot SU1, the radio base station 30 receives an uplink signal SU3 from another mobile radio device 100.
and Sun are included in one frame and sent.

The wireless base 830 that received the slot switching completion report (
3207>, sends a calling signal to the gateway exchange 20 5208>, upon receiving this, the gateway exchange 20 detects the ID of the mobile radio 100 and selects the necessary one among the switch groups included in the barrier exchange [20]. Turn on the switch (320
9), send a dial tone (5210, 5th B)
figure).

This dial tone is transferred by the wireless base station 30 (S211>, and the mobile wireless device 100 confirms that the communication path has been set (3212>).

The above explanation has been regarding the radio channel CH1, but it is confirmed that the same procedure as above is followed for the channel Cl-12, and that the communication path is set at approximately the same time.

There is no problem in the above example, but wireless channels CH1 and CH
2, depending on the time slot number assigned to the audio signal, there may be a time difference between the audio outputs of the speed restoration circuits 1381 and 138-2, and in this case, the time difference is compensated for after being added to the signal mixing circuit 152. There is a need to. This is not particularly difficult technically; for example, if the time slot numbers allocated in each radio channel shown in FIG. 2A (a) are p for CH1 and q for CH12, then D>Q. For example, the output of channel CH2 appears to speed restoration circuit 138-1 earlier by (ρ-q) slots. Therefore, in response to an instruction from the control unit 40 of the radio base station 30, a delay circuit (not shown) included in the signal mixing circuit 152 controls the channel Cl-1 for the time corresponding to (p-q) slots.
1 signal may be delayed and the signals may be mixed. This makes it possible to receive a signal with a frequency diversity effect. When a communication signal can be obtained from the signal mixing circuit 152 in this way, the telephone section 1 of the mobile radio 100
Since a dial tone is heard from the 01 handset, the dial signal begins to be sent.

The dial signal from this mobile radio device 100 is divided into two by a signal division circuit 139 and speed conversion circuits 131-1 and 131-1.
The speed is converted by 1-2 and the two transmitters 134-1, 1
34-2 and transmission mixers 13.3-1 and 133-2, respectively, using upstream time slots SU1 of channels CH1 and CH2 (S213>).

Thus, the transmitted dial signal is received by the radio receiving circuits 35A and 35B of the radio base station 30. This radio base station 30 already responds to the calling signal from the mobile radio device 100, gives the time slot to be used, and also signals the signal selection circuit groups 39A, 39B and the signal allocation circuit group 52A of the radio base station 30. 52B and for example 39A and 52A for radio channel CHI.
, 39B and 52B are respectively assigned to the same channel CH2, and the upstream time slot SU1 of channels CH1 and CH2 is received.
The state has shifted to the state where the signal of the downlink time slot SD1 is transmitted.

In addition, the communication path control section 81 selects a switch 5R for reception among the switch group 83 according to a control signal from the control section 40.
A-1-1 and 5RB-1-1, and switches 5TA-1-1 and 5TB-1-1 for transmission are set to the ON state (FIG. 1C-2). 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 and 39B, and then passes through each signal speed restoration circuit 38-1 of the signal speed restoration circuit group 38A and 38B. 1, the original transmission signal is restored here, and is transferred to the gateway exchange 20 as a call signal 22-1 via the signal processing unit 31 via the switch group 83 (
S214>, a call path to the telephone network 10 is set (32
15>.

On the other hand, an input signal from the barrier switch 20 (initial control signal,
When a call is started, the call signal) is sent to the switch 5TA-1-1, 5TB of the switch group 83 in the wireless base station 30.
-1-1, signal speed conversion circuit group 51A, 51
After receiving speed conversion in each signal speed conversion circuit 51-1 of B,
Each signal assignment circuit 52- of the signal assignment circuit groups 52A and 52B
1 gives the time slot SD1 of the radio channels CHI, CH2. And wireless transmission circuit 32A
, 32B to the mobile radio device 100 using the time slot SD1 of the downlink radio channel CH1-CH2. The mobile radio device 100 is waiting for reception in each time slot SD1 of the radio channels CH1 and CH2, and is received by the radio reception circuits 135-1 and 135-2, and the output thereof is sent to the speed recovery circuit 138-1.138.
-2 is input. In this circuit, the original signal of transmission is restored and sent to the telephone unit 101 via the signal mixing circuit 152.
input into the handset. In this way, a high-quality telephone call using frequency diversity is started between the mobile radio device 100 and a regular telephone in the regular telephone network 10 (3216>).

The call is terminated by turning on-hook the receiver of the telephone unit 101 of the mobile radio 100 (3217), and the end-of-call signal and the on-hook signal from the control unit 140 are transmitted to the speed conversion circuit 1.
31 from the wireless transmission circuit 132 to the wireless base station 30 (S218), the control unit 140 stops the operation of the transmission/reception intermittent controller 123, and switches 122-1 to 122-4. They are fixed to the output ends of synthesizers 121-1 to 121-4, respectively.

On the other hand, in the control unit 40 of the radio base station 30, the mobile radio device 1
Upon receiving the call termination signal from 00, the switches 5RA-1-1, 8RB-1-1, 5TA-1-1,
Turn off 5TB-1-1 and end the call (3220>
. At the same time, signal selection circuit groups 39A and 3 in the radio base station 30
9B and signal allocation circuit groups 52A and 52B are respectively opened.

In the above explanation, it was explained that the control signal between the radio base 830 and the mobile radio 100 is not passed through the signal speed conversion circuit group 51A or 51B, the signal speed restoration circuit group 38A or 38B, etc. For convenience of explanation, signal speed conversion circuit groups 51A and 5 are used similarly to audio signals.
1B, the signal speed restoration circuit groups 38A and 38B, and the signal processing section 31, communication can be carried out without any problem.

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 call traffic is busy or if an important subscriber makes a call, it may not be possible to use two radio channels and only one radio channel can be used. Even in this case, although the diversity effect cannot be obtained, it is possible to make a call. That is, in the above explanation, it is sufficient to focus only on the operation of radio channel CH1 and ignore CH2.

On the other hand, when call traffic is slow and three or more wireless channels are available, the same method as above can be applied. However, it becomes necessary to provide the mobile radio device 100 with three or more sets of transmitters and receivers. Although there is no problem in the above example,
When a plurality of radio channels are used and time slots with different slot numbers are used, a delay related to the difference in the time slot numbers occurs in audio output as described above. To this end, 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 compensates for the time difference included in the signal speed restoration circuit group 38. It is necessary to operate a delay circuit (not shown) for this purpose. The operation of the mobile radio device 100 described above can be directly applied to the operation of the mobile radio device 100B (FIG. 1D).

(3) 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, the mobile radio device 100 is in a state of waiting to receive downlink control signals of the radio channels CH1 and CH2 according to the procedure defined by the system.

Assume that an incoming call signal to the mobile radio device 100 arrives at the radio base station 30 from the general telephone network 10 via the barrier switch 20. These control signals pass through the signal speed conversion circuit groups 51A and 51B via the switch group 83 as the communication signal 22, similar to the voice signal, and are sent to the signal allocation circuit groups 52A and 52B.
The information is transmitted to the control unit 40 via. Then, the control unit 40 controls the communication path control unit 81 to transmit and receive switches STA, STB, and SRA of the switch group 83.

Check the switches that can be used as SRBs and instruct them to keep them in the on state. At the same time, empty slots among the downlink time slots of radio channels CHI and Cl-12 addressed to the mobile radio device 100, for example, SD
ID signal of mobile radio device 100, incoming call signal display signal, time slot use signal (mobile radio device 100
For example, SUL, which corresponds to SDI, is used for transmission.

In mobile radio device 100 that receives this signal, it is transmitted to control section 140 from receiving sections 137-1 and 137-2 of radio receiving circuits 135-1 and 135-2, respectively.

The control unit 140 transmits this signal to its own mobile radio device 100.
To confirm that it is an incoming call signal to the telephone front 10
At the same time, the switch 122 operates the transmission/reception intermittent controller 123 to stand by at the designated time slot SD1.5tJ1.
-1 to 122-4 start turning on and off. In this way, a state has been reached in which high-quality calls can be made by applying frequency diversity.

However, even in the above state, the speed restoration circuit 138-
1,138-2, and speed conversion circuit 131-1.13
1-2 is assumed to be in a dormant state.

Next, we will theoretically explain how this system can be used to perform signal transmission in good conditions without adversely affecting other wireless channels within the system. for that,
Let us take the radio signal of the uplink channel CH1 (transmitted by the mobile radio gJt100(B) and received by the radio base station 30) as an example.

First, assume that all uplink radio signals are empty lines, that is, all time slots are not used. The mobile radio device 100 that wishes to make a call receives a control signal in the downlink radio channel, for example, time slot SD1, so that the mobile radio device 100 determines the usable time slot of the uplink radio channel.
After selecting a slot (for example, time slot SDI>), the radio transmitting circuit 132 sends a control signal (a speech signal if a speech path is set) to the radio base station 30 in response to a signal from the timing generation circuit 142.

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

The signals included in the uplink radio channel explained above will be expressed mathematically.

The data or voice signal (for signals in analog or digital format), which is the output signal (or control signal) of the telephone section 101 in FIG. 1B, can be expressed as follows.

μ(t) − Σa−COS (ωi + θ1) 1 = 11 Also, the control signal that exists outside the band is uC(t) −, X, aicos (ω, t+θ haze, where a・ is the amplitude where ω is the angular frequency of the signal, θ
i represents the phase when 1=0. m.

n represents a positive integer.

Next, the case of frequency modulation will be explained, but the present invention is similarly applicable to both phase modulation and amplitude modulation. When a carrier wave is frequency-modulated using equation (1) or equations (1) and (2), the resulting modulated wave is I= 1 (> sin f (ω0 μ(t)) dt=
I □ S! n (ω = 15(t) > (3)
Or, 1=IQSinf(ω10μ(1)10μ.(t))dt−
I □ S! n (ω to 15(t) + s.(t)), where s (t) = to, 'ini sin <ω, to 1θ Kasumi m・=a・/ω(<i=1.2.3 ..., n)
5(t)+5o(t) shown in equation (4) represents a general form of transmission signal.

Now, using equation (3) or equation (4), the radio signal sent from the antenna of mobile radio device 100 is expressed by the following equation.

1= (101/ n> [1+2 YX, (n/m
x> )XSin (m7r/n)CO3mpt]x
s+n (Ω1t+51(t)+5o1(t)) where n is the number of slots (equal time intervals) within one frame, p is the switching angular frequency, and m is a positive odd number.

Equation (5) is for the case where the transmission signal from the mobile thermal tlA device 100 using the same radio channel is one of n slots in one frame, but all slots are implemented with signals. That is, when n mobile radio devices 100 are communicating using the same radio channel, the expression of the signals included in the radio channel is as follows.

1= (101/n) [1+211(n/m7r)
)xsin (mπ/n) cos mp t]
xsin (Ω i + S m + 5o1(1)
) ten (102/n) [1+2Σ (n/mπ)) m=1 Sln xcos sin (mπ/n) ml) (t-2π/ (np))] (Ω2t+52(t)+5o2(t))+( I03/n> [1+2Σ (n/mπ)) m=1 xsin (mπ/n) xcos mp (t-4yr/ (np)) ]x
sin (Ω3i+S3 (t) +5o3(t) )
+・・・・・・ Ten (1'□n/n > [1+2Σ (n/mπ)) m=1 xsin (mπ/n> xcos mp (t -2(n-1) yr/ (r
+D) ) ]xsin (Ω t 10s (t)
+ s cn(t) )n where p is the switching angular frequency, m is a positive odd number, and the switching times for n input waves are equally spaced.

Also Ω, Ω2. ..., Ω are different symbols because the carrier frequencies transmitted from each mobile radio device 100 are slightly different even though they are on the same radio channel. S.
(1) and S. 1(t) (i = 1, 2゜...,
The same applies to n).

The radio signal transmitted from the radio base station 30 in FIG. 1A is
The mobile radio device 100 that communicates with each other receives only the signals necessary for itself in the equation (6) using the timing generator 142 shown in FIG. Selective reception is performed using the controller 123.

Now, for the mobile radio device 100-1, the second A
Assuming the time slot SDI shown in the figure, the first term on the right side of equation (6), that is, the signal shown on the right side is obtained.

When equation (5) passes through the amplitude limiter included in the receiving section 137 in FIG. 1B, it takes the form shown in the equation below.

I=Asin (Ω1 t+s1. (t) +5o1
(t) ) (5') However, A is the amplitude and is not related to frequency or time.

When equation (5') passes through the frequency discriminator included in the receiving section 137, the demodulated output is e(t)=μ(1)10μ. (1) Obtain. Then, this output is sent to the speed restoration circuit 1 in FIG. 1B.
31, the original signal is reproduced.

The case where the wireless base station 30 transmits and the mobile wireless device 100 receives is described above, but when the mobile wireless device 100 transmits,
The case where the wireless base station 30 receives the signal will be explained in the same manner. However, in this case, instead of receiving only the signals required for the mobile radio 100 itself as in the case of the mobile radio 100, it is necessary to receive all the signals sent in chronological order from a large number of mobile radios t1100. They differ in certain respects.

Hereinafter, equation (6) will be modified as it will be necessary to investigate the influence of adjacent channel interference, which will be described later.

(6) The second right side is expanded as shown below.

I= (I01/n) [sin (Ω1j+U1
(t) )+(n/π) sin(π/n> x[5in((Ω +D)t+U1(t))+5in(
(Ω - p) to 10u1m ) ]] + (n/3π) sin (3yr/n) x [5in
((Ω1 +3p)]+U1 (t)−(6π/n>(
n-1>) +5in((Ω-3p)t+U1 (t)+(6π/
n) (n-1>)] + (n15π) sin (57r/n>x[5in
((Ω1+5p)t+U1(t)−(10π/n>(n
-1)) +5in ((Ω1-5p)t+U1m + (10π/n) (n-1>)] 10-°゛-] + (102/n) [sin (Ω2 t+U
2 (t) ) ten (n/π) sin (π/n> x[5in((Ω2+p)↑+U2(t))+5in(
(Ω2 1)) t+U2 (i) ) ]+ (n/
3π) sin (3π/n) x [5in((Ω2 +
3D)t+U2(t)=(6π/n>(n-1>) 15in((Ω2 3D)t+U2(t)+(6π/n
)(n-1>)ko15(n15π) sin (57r/n>x[5in((
Ω2 + 5 D ) j + U 2 (j) - (1
0π/n)(n-1)) +5in((Ω2 5p)t+U2(t)+(10π/
n>(n-1>)] +・・・・・・
] ten (I□o/n) [sin (Ω1j+U1(t
))+(n/π) sin(π/n> x[5in((Ω 10p)t+Un(t))+5in(
(Ω.-p)t+Uo(t)) ]+ (n/3π)s
in (3π/n) x [5in ((Ω, +3p)t
+Un(t)-(6π/n)(n-'l)) +5in((Ω, -3p) t+LI, (t)(6
π/n)(n-1>)] + (n151sin (5yr/n>X[5in(
(Ωn +5 D) t +U n (t) (10π
/n)(n-1>) +5in((Ω.-5p)t+U, (t)(10π/
n>(n-1>)] +・・・・・・
] However, U・(t)=s・(t)±s. 1(t) (i=1.2.
..., n) Here, looking at equation (7), it can be seen that it is a combination of many carrier waves.

Adjacent wireless channel interference, which is a problem in system construction, is as follows:
It will be explained that the system according to the present invention can be operated without any practical problems by quantitatively evaluating co-radio channel interference and the amount of delay time of transmission signals.

(1) Adjacent radio channel interference The number of time slots in one frame is 10. Taking as an example the case where the audio multiplicity is 10.1 and the frame period is 100 msec, it can be seen that most signal components remain within one channel and have very little influence on adjacent channels.
This will be explained quantitatively below.

In equation (7), adjacent radio channel interference will be greatest when all implementations are in use, that is, when all time slots are in use. Also, for convenience of calculation, the carrier wave frequency Ω<r=1.2 transmitted from each mobile radio device 100. ... n)
and the transmitted signal Ui (i=1.2.−, n>
Regarding Ω1=Ω2=...=Ω.

Even if U1=U2=...-Uo, the effect on the amount of interference is ignored (actually, this case is the maximum interference that can occur).

Furthermore, in an actual system, '0l-102="""=l0n='0(8'), so equation (7) can be expressed as follows.

I/n= (Io/n) (sin (Ω1t+lJ1
(t) ) ten (n/π) sin (π/n) x [sin
[(Ω1 +J)) t +LJ1 (t) )+si
n[(ΩID)j+U1 ([))]+(n
/3π) sin (3π/n) x [5in((Ω1
+3 p) t + Ul (t) - (6π/n>(n
−1>) +5in((Ω1 3p)j+U1(t)−(6π/n
)(n-1>)] + (n151sin (5π/n)x[5in((
Ω1+5 p) t +U1 (t)-(10π/n>
(n-1>) +5in((Ω1 5D>t+U1 (t)-(10π
/n>(n-1>)]) +......) As the value of p included in equation (9), assuming 20π radians, that is, the frequency is 10Hz, and ignoring the phase of the carrier wave, the energy If (voltage) is expressed as a peak value (as a result, the influence of interference radio waves will be greatly evaluated), the following equation is obtained.

I/n= (I□/n) (1 + (n/π) sin (π/n) + (n/3π) sin (3x/n) 10-) (I
□/rl) ((n/π)S!n (7r/n)+ (
n/3yr) sin (37r/rl) 10...1 However, the position of the carrier frequency of the above interference radio wave from the perspective of other radio channels is p=O, that is, ±p, respectively, above and below the main carrier frequency. ±2p, ±3D,... They are far away. However, calculations continue based on the assumption that the area has the greatest impact.

So, sin (π/n), sin (3π/n),
Since the absolute value of sin (5x/n), . That is, if these are all set to 1, equation (10) becomes I/I□ =1+ (n/π)(1+1/3+115+
...+1/(2n-1) +...) +(n/π) (1+1/3 +115+...+1/ (2n-1) ten...) The first right-hand side of this equation (11) The first term refers to the main carrier component, the second term (n/π)() refers to the subcarrier component in the upper frequency band of the main carrier, and the third term (
n/π)() represents the subcarrier component in the lower frequency band.

When the energy distribution of a large number of carrier waves shown in equation (11) is shown on the frequency axis, it becomes as shown in FIG. From equation (11), the reserved subcarrier energy in the wireless channel (
Among the amplitude values), the energy within 10 KHz above and below the center frequency is compared with the energy within 10 to 20 Ktlz. First, the energy (voltage value) within 10K) 12 E = (10 to Z) = 2n/yrx 5.5
506 Also, the energy E (2
0KH7) = 2n/πx O, 1421 Therefore, R= E (20KH2) /E (10KH2):
It can be seen that the value has gradually decreased to 0.0256, or approximately 1/40.

Similarly, if you find the energy within 20 to 30 KH2 above and below and compare it in the same way, it will be 0.00761 or about 1/1
It has gradually decreased to 30.

The above approximate example is a result of calculations emphasizing the existence of a large number of subcarriers, but despite this, 99% of the transmission output
% or more of the energy exists within the transmission band of its own wireless channel, and the remaining energy of 1% or less may cause radio wave interference to other channels.

Using equation (11), find the carrier wave power that can cause interference to the adjacent channel. However, in the calculations below, it is assumed that the frame configurations of adjacent channels are exactly the same.

Adjacent channels shown in Figure 6 have a channel spacing of 125K.
If the subcarrier frequency 75 (Hz ~ 175K) lz component causes interference in this channel, the total power is calculated from equation (11). On the other hand, the main carrier energy (this is Since the energy of the channel's main carrier (equal to the energy of the main carrier wave) is 1, the signal-to-interference ratio (
(hereinafter abbreviated as D/U) is 1/0.0027, which is 50 dB when expressed in decibels (however, it is a power ratio).

In the above calculations, p was 20π radians (10Hz), but if we perform the same calculations when p is 100Hz (the purpose of increasing p is to shorten the signal delay time, as will be explained later), , the signal to jammer ratio is 30dB
(power ratio). By the way, in general mobile communications, the allowable D/lJ (signal wave to interference wave) value as co-channel interference is 24 dB (power ratio), so the above calculated value is satisfied with a sufficient margin. It shows that there is. That is, it can be seen that even if the transmission wave according to the present invention is operated intermittently in a pulsed manner, the radio wave interference exerted on adjacent channels can be ignored.

The above explanation was based on the mobile radio device 100, but
Similarly, calculations can be made for transmissions from the wireless base station 30, and the results are almost the same. However, "wireless base station 3
In the case of transmission from 0, the usage conditions within the time slot for synchronization signals and control signals are different, and the usage frequency distribution within the time slot differs by this amount, but the influence is small.

(n) Co-channel interference Co-channel interference occurs because of the characteristics of the bandpass filter or intermittent circuit set at the output section of the wireless transmission circuit, and the high-order wave of the transmission pulse expressed by equation (9),
That is, this is because a carrier wave whose carrier frequency has a large value of n out of Ω1±np is not output. In this case, the ideal shape of the envelope of the signal wave sent out into space is not a rectangle (within which the carrier wave is accommodated), but a waveform that is a rectangular wave with many sine waves superimposed on it. (The waveform has an envelope of -1 to -1 as shown in FIG. 2B (d)). Then, signal components with this shape enter other time slots, causing co-channel interference.

This influence will be theoretically determined below.

Assume that time slots SD1 and SD2 are used for communication A and communication B (FIG. 2B (d)). The interference waves that influence communication A on communication B can be expressed numerically with reference to equation (7) as shown in the following equation.

xsin ((2m+1) π/n) [cos
((Ω+ (2m+1) p)t+U(t'))
-cos((Ω-(2m+1)p) to 10U(t))
] To specifically obtain equation (16), it is sufficient to perform the same numerical calculation as already performed for equation (1). Therefore, if the characteristics of the filtering circuit included in the wireless transmission circuit 32 are wideband, m□ is, for example, 10000 (1
0Kzx 10000 = 100H2) If it is set to 0Kzx 10000=100 or more, the influence of co-channel interference can be ignored.

In an actual circuit, this condition can be easily satisfied.

(I[I) Influence of delay time of transmission signal The reason why a large transmission delay occurs at the transmitting/receiving end (transmitting/receiving terminal) is due to the following factors.

i) Divide the transmission baseband signal into regular intervals and store them in a storage circuit (for example, 8BD, C0D).

) The signals received at the receiving end (receiving terminal) are divided into slots and stored in a memory circuit.

ii) Signal transmission time due to the distance between the transmitter and the receiver, and the delay time caused by the IF circuit, the transmitter/receiver mixer circuit, the transmitter/receiver filter section, etc. are small and will therefore be omitted.

Of the above, ii+) is, for example, in the aforementioned car phone, the distance between transmitting and receiving is at most about 107 m (wired section omitted), so 10 KIn/300000/y = 1/30 m5ec
In addition, for mobile phones, a system has been proposed in which the communication area of one wireless base station is made into a very small zone with a radius of approximately 25 meters (Ito, "Proposal of mobile phone system - An approach to ultimate communication -" Communications Society of Japan Technical Report C8 Study Group November 1986 C386-88 and "Mobile Telephone System" Patent Application 1986-64023).

In the mobile phone system described above, the distance between transmission and reception is approximately 100m at most (wired section omitted), so 100m/300000KIrt= 1/3000ms
It is ec. Therefore, it can be ignored compared to i) and ii).

Now, the occurrence of the delay times i) and ii) is schematically shown in FIGS. 7A and 7B.

In FIG. 7A, the signal speed conversion circuit group 5 of the radio base station 30
The input to the signal speed conversion circuit 51-1 in 1 is applied as shown in (a), and the time period T required by the unit of speed (pitch) conversion is applied as shown in (a) (time flows from left to right). The signal A is compressed to 1/n by the signal speed conversion circuit 51-1 and outputted so that the trailing edge of the compressed signal shown in (b) coincides with the output signal A, which becomes (C). The signal is output from the wireless transmission circuit 32 as shown in FIG. The mobile radio 11100 that received this
The compressed signal A is received at the input of the speed restoration circuit 138 at the timing shown in (d), and the signal A shown in (a) is restored and outputted as shown in (e). Here, the delay time τ1 from the leading edge of signal A in (a) to the leading edge of signal A in (e) is ding/n. However, the transmission time from the transmitter output section to the spatial transmission section and the receiving section output of the mobile radio 111100 was ignored.

In FIG. 7B, the signal speed conversion circuit 51 of the radio base station 30
-1, the leading edge of the output signal A compressed to T/n is output at the same time as the trailing edge ends. Therefore, the output of the wireless transmitting circuit 32 is (
The mobile radio m1oo receives this as shown in C).
The input of the speed restoration circuit 138 becomes as shown in (d), and at the same time as the trailing edge of the compressed signal A, the leading edge of the signal A shown in (e), which has been expanded by n times and restored, is as shown in (d). Sent out. Therefore, from what is shown in (e), T+T/
A delay time τ2 delayed by n=τ2 occurs.

The circuit for processing the signal shown in FIG. 7A is
Although it is more complicated than that shown in Figure B, the delay time can be reduced. On the other hand, in the case of FIG. 7B, the delay time is slightly longer, but the circuit is simpler.

Now, in actual communication, especially in two-way communication such as voice communication, the sender expects a response from the other party, so the delay time needs to be twice τ1 or τ2. Try applying actual numbers. For example, if one time slot (one division) of a transmission signal is T = 1/10 seconds and the time compression coefficient n = 10, then 2'Z-1 = 2x1/10 (1-1/10) = 18/
100 = 0.18 seconds (180ms) 2 = 2X1/10 (1+1/10) = 22/10
0=0.22 seconds (220 msec). On the other hand, the delay time in satellite communication is approximately 250m.
Since it is in seconds, the above value is about the same as in the case of satellite communication. If it is desired to reduce the delay time, it is sufficient to reduce the time slot (one time interval) in the baseband.

In other words, the number of kings is decreased from the above example, and T=1/100.
seconds, time compression factor n=100. Then, 2τ1=2X
1/100) (11/100) = 2X99/10000
→0.02 seconds (20ms) 2τ2 = 2x1/100) (1+1/100) = 20
2/10000 = 0.02 seconds (20 msec) As a concrete system, for example, the number of time slots allocated to the same mobile terminal within one frame is 10, and the time slots for other communications are cyclically allocated. The above conditions can be satisfied by giving . (The time for one frame should be reduced to 1/10).

The above is the amount of delay time that is inevitably determined by system design, and the delay time for wired systems has been omitted. However, the delay time of the wired system can be compensated for, so it does not have a major impact on the system.

The delay time that may affect the system will be explained below. This is because the distance between the mobile radio 111100 and the radio base station 30 differs depending on the location of each mobile radio, so when the radio base station 30 receives a communication signal transmitted (received) from each mobile radio, 1. Due to different spatial transmission distances, there is a possibility that gaps may occur due to duplication of each time slot.

For example, in the case of a car phone, a mobile radio device 100 is located near the radio base station 30, and another mobile radio device is located near the radio base station 30.
Assuming that the distance is /It from 0 to 10, the delay time difference is <1/30 m5ec as described above. That is, since the time slot may double by about Q, 03 m5 ec, it is necessary to provide a protection time of about 0.05 m5 ec.

In the case of a mobile phone, in the above example, the distance difference between the two mobile radios and the radio base station 30 is 100 m, so the delay time difference is 0.0003 msec.

Therefore, in this case, it can be ignored in a system having signal components of IMH2 or less.

(IV) Calculation of frequency effective utilization rate The frequency effective utilization rate of the system is determined in the case of using the pulse communication according to the present invention explained above and in the case of using conventional FM communication. The modulated signal is assumed to be voice, and a telephone communication circuit is assumed. The following values are taken as the method specifications.

1) Pulse communication of the present invention 1 radio channel with 10 time slots or audio 1
0 channel can be transmitted. The required frequency bandwidth is 3KHz x 10 = 30KHz. By providing a protection band, it is ±4 as shown in Figure 8 (a).
Set to 0KH2. This value is disadvantageous to the present invention, and in reality, such a wide guard band is unnecessary, but this value is used for comparison.

2) In the case of conventional FM communication (1 audio channel/carrier wave), the baseband signal of 1 radio channel is 1 audio channel, so the required frequency bandwidth is 3KHz xi = 3K
Hz ±8KHz is required as a protection band, and the radio carrier spacing is 12゜5Kl-1z as shown in Figure 8(b).
(In our [II, this standard is widely used in cordless telephones, etc. in the 250MHz/400MHz band.) Therefore, in order to simultaneously transmit 10 channels of audio signals, 12.5KHz xiO = 125KHz is required. I understand that.

Comparing the above two systems, the ratio between the present invention and the conventional example is 80:125=0.64. In other words, in the pulse communication according to the present invention, SCPC (Si
channel per carrier)
It can be seen that a frequency band of only about 60% is sufficient compared to .

Furthermore, the number of channels (number of simultaneous callers) increases, and when compared with, for example, 100 voice channels, the required frequency bandwidth for the pulse communication of the present invention is (3KHz xlooo +50 (guard band) KH2) x2 = 700KHz. In FM communication (SCPC), when two systems are compared, the advantage of the present invention further increases to 700:1250=0.56.

Next, let's look at TDMA (
Tame Divisin ) Ialtiple Ac
A comparison will be made between the frequency effective utilization rate when applying cess) to mobile communication and the present invention.

3) For the DMS90 system (References: F,
Lindell et al.”Digital Ce1lular
Radio for the 1990s” Tel
communications P, 254-265.
0ct This system has 10 channels of audio at a transmission rate of 340 bits/sec (1 channel is 16 bits/sec)
can be multiplexed, but the carrier interval (required frequency bandwidth) is 300KH2.

Therefore, the frequency utilization ratio of the present invention in 1) and the DMS 90 in 3) is 80:300=0.267. That is, the superiority of the present invention is more remarkable than that of the analog system (SCPC).

The operation of the mobile radio device 100 described above can be directly applied to the operation of the mobile radio m100B (FIG. 1D).

(4) Application of transmitting/receiving time diversity (1), (
Through the process described in Section 2>, it is possible to make and receive calls between the radio base station 30 and the mobile radio device 100 using diversity using radio channels CH1 and CH2. 9A and 9B show a method of applying transmitting/receiving time diversity with high layer effect by using other time slots of the same radio channel while
This will be explained using the flowchart shown in the figure. The purpose of applying this type of transmitting/receiving diversity is to improve the quality of communication, and when there is a free communication time slot during low traffic times, or to provide high quality service to key subscribers (VIPs). This is done for the purpose of providing.

First, a call is made from the mobile radio device 100 described in section (1), and the downlink time slot SD1. Upstream time slot SU1
using the switch 5RA-1-1 of the switch group 83,
5RB-1-1 and 5TA-1-1, 5TB-1-1
It is assumed that the mobile radio 100 is turned on and is communicating with the telephone network 10 via the radio base station 30 and the gateway exchange 120 (3251, FIG. 9A). The control unit 140 of the mobile radio device 100 that is already on a call decides to apply diversity using another time slot in the same channel (3252) and searches for an empty time slot in the same radio channel. Start (3253).

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. 1D.

Now, in order to search for an empty time slot, the speed restoration circuit 138-3 and the speed conversion circuit 131-3 are started to operate, and the timing signal of the timing generator 142 is changed to change the time that is currently used for transmission and reception.・Move time slots other than slots to a state where they can transmit and receive. That is, the timing signal generated by the timing generator 142 changes the on/off method of the transmission/reception on/off controller 123, and outputs the output from the speed restoration circuit 138-3 to other time slots SD2. SD3. ...Sequentially extract the SDn signals and search for an empty time slot (3254NO, 5253), and if there is an empty time slot, consider using that time slot (3
254>. As a result, for example, the downstream time slot S
When D2 is found to be vacant (254YES)
, a control signal is inserted into the uplink time slot SU1 currently being communicated in a format that does not affect communication, and the wireless base station 3
A signal requesting the use of time slots SD2 and 5tJ2 is sent to 0 (3255, FIG. 9B).

This signal is received by the radio receiving circuit 35A of the radio base station 30 and transmitted to the control wJ unit 40 (8256). As a result of the investigation, the control unit 40 determines that time slots SD2 and 5LI
2 is unused and prepares for its use (S256>, the currently used downlink time slot S
D1 is used to insert a control signal in a manner that does not affect communication, and a message is sent to the wireless base station 100 that the desired time slot SU2 is available (S257>. At the same time, the wireless base station Ei30 The signal selection circuit 39-2 and the signal speed restoration circuit group 38 in the signal selection circuit group 39 of
The signal speed restoration circuit 38-2 in A is in a standby state, and the signal allocation circuit 52-2 in the signal allocation circuit group 52A and the signal speed conversion circuit 51-2 in the signal speed conversion circuit group 51Δ
is also shifted to the standby state in the same way.

Mobile radio device 1 receiving a report signal from radio base station 30
00 causes the timing signal of the timing generator 142 to be changed so that on reception, time slots SD1 and SC
2 into a reception ready state, and during transmission, time slots SU1 and SU2 are used to transmit the output of the telephone section 101 to the signal division circuit 139 and the speed conversion circuits 131 to 1.1.
313 to the wireless transmission circuit 132-1 (3259>).

On the other hand, the radio base station 30 receives the signal sent from the mobile radio device 100 using time slots SUI, SL, and 12, and uses the control signal to confirm that it is the signal from the mobile radio device 100 (3260 ), call control section 81
Then, switch 5RA-1-1, 5RB of switch group 83
-1-1, 5TA-1-1, 5TB-1-1 are in the on state, and 5RA-2-1, 5TA-2-
1 on (FIG. 1C) and the call continues (82
61). Subsequent communications use two time slots for radio channel CH1 and one time slot for radio channel CH2 for both transmission and reception, and transmit/receive diversity (in this case, Communication quality can be further improved by combining the frequency diversity (time diversity) effect explained above.

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, the initiative when applying diversity was given to the m device 100 before moving, but the wireless base station 3
The same implementation is possible when 0 is given the initiative.

Furthermore, instead of applying the transmitting/receiving diversity as soon as the call is started as described above, it is also possible to apply the transmitting/receiving diversity from the beginning, which will be explained below.

Taking the case of making a call from the mobile radio device 100 as an example, when transmitting an uplink control signal at the time of a call to the radio base station 30 using time slot Sun, there is a message indicating that diversity is to be applied to the control signal. Include the 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 as control signals, for example, SDl and SC2. There is. By receiving this signal at the mobile radio device 100, it adds a control signal to the radio base station 30 indicating that it wants to use SDI and SC2 in the time slot Sun, and also makes preparations for this on the mobile radio device 100 side. Execute. On the other hand, in the radio base station 30 as well, time slots SU, 1. Prepare reception at SU2.

After the above preparations, if it is determined that the execution is possible through mutual confirmation, the mobile radio 100 transmits the uplink time slot S.
If the radio base station 30 starts transmission in the downlink time slots SDI and SD2, diversity can be applied from the start of the call.

Above, we have explained the case of double multiplicity of diversity using two series of time slots in one radio channel, but it is also possible to implement the case of increasing the multiplicity roughly. It is also possible to implement this in combination with frequency diversity using many radio channels.

[Effects of the Invention] As is clear from the above explanation, by applying the present invention to a mobile communication system that adopts a small zone system,
It is possible to construct a system with higher frequency usage efficiency than conventional systems. In addition, in order to increase the effective use of normal frequencies, other design parameters such as adjacent channel interference, co-channel interference, and delay characteristics of transmission signals that affect line quality can be designed to values that can be effectively ignored. In addition, when communication traffic is quiet, it is possible to apply frequency and time transmission/reception diversity, so the effects of the present invention are extremely large.

[Brief explanation of drawings]

FIG. 1A is a system configuration diagram showing the system of the present invention, FIG. 1B is a circuit configuration diagram of the pre-movement II machine used in the system of the present invention, FIGS. 10-1, 10-2, and 10- FIG. 3 is a circuit configuration diagram showing details of the whole and parts of the wireless base station used in the system of the present invention, and FIG. 1D is a circuit configuration diagram of another embodiment of the mobile radio device used in the system of the present invention. , FIG. 2A is a time slot structure diagram for explaining the time slots used in the system of the present invention, FIG. 2B is a diagram showing the radio signal waveform of the time slot, and FIGS. 3A and 3B are A spectrum diagram showing the spectrum of a call signal and a control signal, FIG. 3C is a circuit configuration diagram for multiplexing voice signals and data signals, FIG. 4 is a flowchart showing the flow of location registration operation of the system according to the present invention, and FIG. 5A 5B is a flowchart showing the flow of the calling operation of the system according to the present invention, FIG. 6 is a spectrum diagram for explaining radio wave interference to adjacent channels in this system, and FIGS. 7A and 7B are the system according to the present invention. 8 is a timing chart for explaining the delay time that occurs during signal compression and expansion in the present system. FIG. 8 is a spectrum diagram for explaining the required bandwidth of this system and the conventional system. FIGS. 9A and 9B are A flowchart showing the flow of operations when diversity is applied in a system. FIG. 10 is a conceptual configuration diagram for explaining a conventional system. 10... Telephone network 20... Gateway switchboard 21
...Communication control unit 22-1 to 22-n...Communication signal 23.23-1 to 23-n...Switch group 24...
ID identification storage unit 25...S/N monitoring unit 30...wireless base station 31
...Signal processing unit 32...Wireless transmission circuit 35.
... Radio reception circuit 38 ... Signal speed restoration circuit group 38-1 to 38-n ... Transmission speed restoration circuit 39 ...
Signal selection circuit group 39-1 to 39-n...Signal selection circuit 40...Control section 41...Clock generator 42...Timing generation circuit 51...Signal speed conversion circuit group 51-1... 51-n...Signal speed conversion circuit 52...
Signal assignment circuit group 52-1 to 52-n...Signal assignment circuit 81...Call path control section 82...ID identification storage section 83...Switch group 91...Digital encoding circuit 92...・Multiple conversion circuit 100.100-1 to 100-n-...Mobile radio device 10
1...Telephone unit 120...Reference crystal oscillator 121-1, 121-2...Synthesizer 122-1
, 122-2...Switch 123...Transmission/reception intermittent controller 131-1, 131-2...Speed conversion circuit 132...
・Wireless transmission circuit 133... Transmission mixer 134...
Transmitting section 135... Radio receiving circuit 136...
Reception mixer 137...reception section 138-1, 138
-2...Speed restoration circuit. 139...Signal dividing circuit 141...Clock regenerator 142...Timing generator 152...Signal mixing circuit 182...ID information collation storage unit.

Claims (1)

[Claims] A plurality of sets of signal speeds each covering a plurality of zones to constitute a service area and converting the signal speed separated by a plurality of time slots included in each frame to a high speed, respectively. a converting means (51); and a plurality of sets of signal assignments for serially outputting signals in time series at timings assigned to signals separated by a plurality of time slots included in each frame converted at high speed. means (52), a plurality of wireless transmission means (32) for transmitting the output of the signal allocation means as radio channel radio waves, and a plurality of time slots included in each frame converted to high speed. a plurality of radio receiving means (35) for respectively receiving a plurality of radio channel radio waves transmitted serially in time series at timings assigned to divided signals; and a plurality of radio receiving means (35); A plurality of sets of signal selection means (39) for receiving the output and converting the signals separated by the plurality of time slots included in each serially sent frame into parallel signals and outputting each signal. and a plurality of sets of signal speed restoration means (38) for receiving each signal from the plurality of sets of signal selection means, converting it to a low speed and restoring the signal to obtain each output signal, and the plurality of sets of signal selection means. Control is performed to apply one signal to be communicated to at least one time slot in each frame in the speed conversion means, and to obtain at least one output signal from the plurality of sets of signal speed restoration means. each radio base means (30) comprising channel control means (81, 83) for moving across said plurality of zones and communicating with said radio base means using at least one radio channel; , a plurality of time frames included in each frame in each of the radio channel radio waves sent from the radio base means.
At least one time zone separated by slots.
A plurality of wireless receiving means (135, 121-1, 121-2, 122-1, 12
2-2, 123); and speed restoration for receiving the output of the wireless receiving means, converting it to a low speed and restoring the signal included in the at least one time slot in each frame into a continuous signal. means (138); and a plurality of speed conversion means (131) for dividing the signal to be transmitted and converting the speed at high speed in at least one time slot separated by a plurality of time slots included in each frame. ), and converting the outputs of the plurality of speed converting means into the at least one speed converting means.
A plurality of radio transmitting means (one
32, 121-3, 121-4, 122-3, 122-
4, 123) and barrier exchange means (20) for exchanging communications between said radio base means and said mobile radio means. In the split communication method, prior to starting communication, the mobile radio means receives radio waves from a plurality of radio channels transmitted from nearby radio base means with which communication is possible, and selects radio waves from which communication is possible. Selecting an empty time slot included in at least one radio channel and using it to transmit self-identification information given to the mobile radio means, and receiving the same, the radio base means and the barrier exchange. A time division communication method in mobile communication in which at least one of the means stores this identification information.