JPH0432325A - Time division communication system in mobile communication - Google Patents

Abstract

PURPOSE:To attain circuit constitution for a small sized, light in weight and simple radio base station and to facilitate power saving and maintenance by providing a signal speed conversion circuit for the conversion or the decoding of a signal speed and the assignment or the selection of a time slot, a signal allocation circuit, a signal selection circuit and a signal speed decoding circuit on a radio system exchange. CONSTITUTION:A signal speed conversion circuit 51 converts the speed of plural divided signals into a high speed respectively with respect to an input signal from a wired system exchange 18 to a radio system exchange 19. Then the signal is exchanged corresponding to the call signal, a signal assignment circuit 52 arranges signals in time series so as not to be overlapped with each other and sends the result to a radio base station 30. The signal sent from the radio base station 30 is separated corresponding to each communication signal by a signal selection circuit 39 and exchanged and the speed of the signal is converted into a low speed by a signal speed decoding circuit 38. After the original transmission signal from the mobile radio equipment 19 is decoded, the result is sent to a wired system exchange 18. Thus, the radio base station 30 is miniaturized, recluced in weight, the low power consumption is attained and the maintenance is simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is directed to a time-division communication system for communication channels in fixed or mobile communications for a plurality of telephones and mobile radios housed in one exchange. . More specifically, given a radio channel, one of the many mobile radios in the service area sets up a radio link with the opposing radio base station, and connects the system via an exchange. If another mobile radio device requests communication using the same radio channel while you are communicating with another mobile radio device or telephone, the communication between the mobile radio device and the radio base station that is already in communication is interrupted. Time-division communication on the same radio channel that allows an independent radio link to be set up between another mobile radio and the radio base station using the same radio channel without adversely affecting communication between them. Regarding the system.

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

Literature 1. Ito “Study of mobile phone system - Time division time compression F
Proposal of M modulation method-'' IEICE technical report RC3,89-1
1 Literature dated July 1989 2. Ito “Study of mobile phone system - Time division time compression F
Theoretical study of M modulation system” IEICE technical report RC389-39
In other words, in Document 1, a transmission signal (baseband signal) is divided into predetermined time intervals and stored in a memory circuit, and when read out, the speed is n times faster than the speed at which it is stored in the memory circuit. It is built into mobile radios and radio base stations in order to be read out in a predetermined time slot at high speed, angle-modulated or amplitude-modulated with the signal accommodated by the time slot, and transmitted and received intermittently over time. a wireless receiving circuit having a receiving mixer that communicates with each other, a wireless transmitting circuit having a transmitting mixer, a synthesizer applying voltage to the receiving mixer of the wireless receiving circuit, and a synthesizer applying voltage to the transmitting mixer of the wireless transmitting circuit. On the other hand, a switch circuit is provided to intermittent the output of each applied synthesizer, and to synchronize this intermittent state for both transmission and reception, and also to synchronize the same intermittent transmission and reception as above with that of the mobile radio device for the radio base station that communicates oppositely. In order to take out only the signal accommodated in the predetermined time slot, the receiving side opens and closes the radio receiving circuit to receive the signal, stores the obtained signal in the memory circuit, and An example of a system has been reported in which a system is constructed in which it is possible to reproduce the baseband signal, which is the original signal that has been transmitted, by reading out the signal at a low speed that is 1/n of the speed at which it is stored in this memory circuit. There is.

In addition, Reference 2 examines adjacent channel interference and co-channel interference, which are problems when applying the TCM (time division time compression multiplexing)-FM method described above to small zones. The possibility of putting the system into practical use has been shown by appropriately selecting the parameters.

However, in Documents 1 and 2 mentioned above, the TCM method is mainly explained only as an example where it is applied between a wireless base station and a mobile radio, and there is no example where it is applied to a PBX (Private Branch Telephone Exchange) or a switch. do not have.

[Problems to be Solved by the Invention] In the system construction examples shown in Documents 1 and 2 above, T
Applying CM signals between radio base stations and mobile radios, TCM
- It was used in the form of FM. If the number of wireless base stations included in the same system is small and the size of the zone is relatively large, this will not be a problem, but with the recent conversion of small zones to microcells or picocells, the same service area The number of wireless base stations that cover the area is increasing, and wireless base stations are becoming smaller and lighter.

There is a strong demand for lower power consumption. At the same time, there is also a need to simplify maintenance. In order to meet these demands, it is necessary to make the configuration of a wireless base station as simple as possible, but as long as it has a relatively complex configuration like the existing technology, it will be difficult to meet the above requirements. i am a female and should be resolved! ! It was a question.

"Means for solving the problem" In a mobile radio device, a transmission signal (baseband signal) is divided into predetermined time intervals and stored in a memory circuit, and when read out, the speed n is faster than the speed at which it is stored in the memory circuit. Built-in mobile radio equipment for reading out data at a predetermined time slot at double high speed, angle-modulating or amplitude-modulating the carrier wave with the signal accommodated by this time slot, and transmitting and receiving the signal intermittently in time. , a switch circuit for a wireless receiving circuit having a receiving mixer that communicates with each other, a wireless transmitting circuit having a transmitting mixer, a synthesizer applying voltage to the receiving mixer of the wireless receiving circuit, and a synthesizer applying voltage to the transmitting mixer of the wireless transmitting circuit. Even in an open switchboard, which intermittents the output of the synthesizer applied to each, and synchronizes both transmission and reception of this intermittent state, and receives time slot signals via the opposing radio base station, mobile radio In order to extract only the signals accommodated in the predetermined time slot, the mobile radio device opens and closes the radio receiving circuit to receive the signal, demodulates the signal, and stores the obtained signal in the storage circuit. By storing it in the memory circuit and reading it out at a low speed that is 1/n of the speed at which it is stored in this memory circuit,
This made it possible to reproduce the baseband signal, which is the original signal that was transmitted.

The gateway switch includes a radio system switch that exchanges signals with a radio base station for transmitting radio signals between mobile radio devices and converts or restores signal speeds, and a radio system switch that exchanges signals between mobile radio devices and a radio base station to convert or restore signal speeds, and a telephone or telephone network. A wired exchange was installed to exchange with the wireless exchange.

Wireless exchanges include signal speed conversion circuits, signal allocation circuits, and signal selection circuits for converting or restoring signal speeds and allocating or selecting time slots.

Contains signal speed restoration circuitry.

[Operations] In a gateway switch, first, in communication between telephones included in the system and the telephone network that sends and receives signals via the barrier switch, the wired switch performs a known operation, and the communication between the telephone or the telephone network is Communication with radio equipment was made possible by a radio system switching system performing switching operations via a radio base station. When performing an exchange operation, the input signal from the wired exchange to the wireless exchange is converted to a high speed by a signal speed conversion circuit, and the speed of each divided signal is converted to high speed, and the signal is exchanged to correspond to a call signal. A signal allocation circuit arranges the signals chronologically so that they do not overlap with each other, and then transmits them to the wireless base station.The signals transmitted from the wireless base station are separated by a signal selection circuit for each call signal and exchanged. After that, the signal was converted to a lower speed by a signal speed restoration circuit, the original transmission signal from the mobile radio was restored, and the signal was sent to a wired exchange to enable communication. As a result, wireless base stations are equipped with only a simple wireless transmitter/receiver, making it possible to make wireless base stations smaller, lighter, and lower in power consumption, as well as simplifying maintenance. .

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

In FIG. 1A, 10 is a general telephone network, and 2 (Ht
This is an open switch for connecting the telephone network 10 and the wireless system. Barrier exchange! 120 has a wired exchange 18
, a wireless system exchange 119, and a communication control unit 45 for controlling this.

Here, connections are exchanged between the wired system and the wireless system, between the wireless system and the wired system, and between the wireless system and the wireless system.

Radio base station 30 transmits and receives radio signals to and from mobile radio equipment.
-1.30-2. ..., 3O=, each of which is a radio receiving circuit 35- that receives a signal from a mobile radio.
1.35-2. . . , 35-i, and a radio transmitting circuit 32-1, 32-2, which transmits a signal to the mobile radio device. ...
, a2-r.

In addition, there is a barrier switch 20 and many wireless base stations 30-1゜30.
-2. ..., aO=, a transmission line is installed for transmitting and receiving a plurality of divided signals converted at high speed.

Next, the internal configuration of the barrier switch 20 will be explained.

The wired exchange 18 not only interfaces with the wireless exchange 19 but also interfaces with the telephones 200-1, 200-2 . ...
200-p means transmission line 21-1.21-2. ...,
The interface is via 21-p. The wireless exchange 19 has a signal selection circuit group 39-1.39 for interfacing with the wireless base stations 30-1゜1 to 30-1.
-2. ..., 39=Ya signal @ assigned circuit group 52-1.52
-2. ... 52-1 and a signal speed conversion circuit group 38-1.3 for interfacing with the wired exchange 1118.
8-2°...38-; and signal speed conversion circuit group 51-
1.51-2. . . , 51-i and a switch group SW for converting high-speed segmented signals.

The communication control unit 45 controls the wireless exchange 19 and includes a clock generator 41 . for supplying timing signals. A timing generation circuit 42 and a control section 40 for control. ID
Information storage circuit 43. It includes a wireless channel information storage circuit 44.

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

Received signals such as control signals and call signals received by the antenna section enter a radio reception circuit 135 including a reception mixer 136 and a reception section 137, and the communication signal output from the radio reception circuit 135 is sent to a speed restoration circuit 13B, a control section 140, and a clock signal. The signal is input to the regenerator 141. The clock generator 141 reproduces a clock from the received signal and applies it to the speed restoration circuit 138, the control section 140, and the timing generator 142.

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

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

The output of the modulator included in the transmitting section 134 is transmitted to the transmitting mixer 13
3, the signal is converted to a predetermined radio frequency, transmitted from the antenna section, and received by one radio base station 30. The received signal is a barrier exchange! 1120, where an available time slot is searched, and the same radio base station 30 sends a time slot use grant to mobile radio m1oo. Time allowed to use
In order to send a radio signal to the radio base station 30 using the slot, it is necessary that timing information from the timing generator 142 shown in FIG. 1B be obtained via the control unit 140.

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

This mobile radio device 100 further includes a synthesizer 121.
-16 and 121-2, and selector switch 122-1, 1
22'-2, a transmission/reception intermittent controller 123 and a timing generator 142 that generate signals for switching the changeover switches 1221 and 122-2, respectively.
Synthesizers 121 - 1 and 121 - 2 , transmission/reception intermittent controller 123 , and timing generator 142 are controlled by control section 140 . Each synthesizer 1211.12
1-2 is supplied with a reference frequency from a reference crystal oscillator 120.

The rate-converted n-channel communication signal between the wireless base station 30 and the gateway exchange 20 is connected to the wireless transmitting circuit 32 or the wireless receiving circuit 35 of the wireless base station 30 via a transmission path. The signal sent from the barrier exchange 20 is amplified to an appropriate level by the radio transmission circuit 32, amplitude- or frequency-modulated, and then converted to a required carrier frequency by a mixer circuit (not shown) included therein. , is fed to the antenna directly or via a high frequency amplifier (not shown). On the other hand, the signal transmitted from the mobile radio device 100 is received by the radio receiving circuit 35.

The input signal from the antenna section is sent to a mixer circuit (not shown).
After the signal is converted to an appropriate intermediate frequency, it is amplified and input to an amplitude detector or frequency discriminator (not shown). The high-speed segmented reception signals transmitted from the mobile radio device 100 are transmitted to the barrier switch 20. The functions of each of the circuits described above are almost the same as the corresponding circuits of mobile radio device 100.

As explained above, the wireless base station 30 to which the present invention is applied does not have any control function such as a CPU,
It has an easy-to-maintain configuration with only a so-called through repeater function. Therefore, when making and receiving calls to and from the mobile radio device 100, control is exchanged between the mobile radio device 100 and the gateway exchange 20, and the radio base station 30 is essentially not involved at all.

FIG. 1C shows the detailed circuit configuration of the barrier exchange l120 portion. Here, the radio receiving circuit 35-1 of one radio base station 30-1. Wireless transmission circuit 32-1 and telephone network 10. Only the relationships between the transmission lines 21-1 to 21-p are shown, and those connected to other radio base stations 30-2 to 30-i are omitted.

Signals from the telephone network 10 or transmission lines 21-1 to 21-p are exchanged by a wired exchange 18, converted into 2-wire and 4-wire, and include signal speed conversion circuits 51-1-1 to 5l-1-n. The signal is input to the signal speed conversion circuit group 51-1, and subjected to speed (pitch) conversion at predetermined time intervals. The function of the signal speed conversion circuit group 51-1 is to store input signals such as audio signals and control signals divided into fixed time lengths in a storage circuit, and change the speed when reading them out. By reading at twice the speed, it is possible to compress the time length of the signal. Signal speed conversion circuit group 51
The principle of -1 is the same as when playing back audio recorded with a tape recorder at high speed.
), 33[) (Bucket Brigade
Device) can be used, and the memory used in television receivers and tape recorders that compress or expand the time axis of conversation can be used (References: Koita et al. ``Compressing the time axis of conversation /Extending Tape Recorder'' Nikkei Electronics, July 26, 1976, pp. 92-133).

COD and BBD illustrated in the signal speed conversion circuit group 51-1
As described in the above-mentioned document, the circuit using the above can be used as it is in the signal speed restoration circuit group 38-1. In this case, the circuit using the clock from the clock generator 41 and the control signal from the control section 40 This can be achieved by receiving a timing signal from a timing generator 42 that generates timing by setting the read speed slower than the write speed.

After passing through the switch group SW, the output of the signal speed conversion circuit group 51-1 is applied to the signal assignment circuit group 52-1 for each time slot. This is a buffer memory circuit and includes signal allocation circuits 52-1-1 to 52-1-n.

One segment of high-speed signals outputted from the signal speed conversion circuit group 51-1 via the switch group SW is stored in memory here, and is buffered using timing information from the timing generation circuit 42 included in the communication control section 45. The signal in the memory is read and transmitted to the wireless transmission circuit 32-1 of the wireless base station 30-1.

As a result, communication signals are arranged in series without overlapping in chronological order when viewed from a channel-compatible perspective, and when all control signals or call signals, which will be described later, are implemented,
It looks like a continuous signal wave.

The state of this compressed signal is shown in FIG. 2 and will be explained.

The output signal of the signal speed conversion circuit group 51-1 is sent to the switch group S.
The signals are input to the signal allocation circuit group 52 via W, and are given time slots in a predetermined order. Second
SD1, SD2, . . . , SDn in FIG. 3A indicate that speed-converted communication signals are allocated to each time slot.

Here, one time slot accommodates a synchronization signal and a speech signal or/and control signal as shown in the figure. If the call signal is not implemented, only the synchronization signal is added and the empty slot signal is added to the call signal portion.

In this way, as shown in FIG. 2(a), in the radio transmission circuit 32 of the radio base 430, signals forming one frame in time slots SD1 to SDn are applied to the modulation circuit.

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

When making or receiving a telephone call, the radio base 830
Regarding the transmission of the control signal between the mobile radio 11100 and the mobile radio 11100, it is possible to use either within the telephone signal band or outside the telephone signal band.

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

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

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

The above was a case of analog signals, but if a digital data signal is used as the 11J control signal, it is also possible to digitally encode the audio signal and time-division multiplex the two to be transmitted. The circuit configuration in case 3C
As shown in the figure. FIG. 3C shows an example of a case where an audio signal is digitized by a digital encoding circuit 91, the audio signal is multiplexed with a data signal by a multiplex conversion circuit 92, and the resulting signal is applied to a modulation circuit included in the wireless transmission circuit 32.

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

On the other hand, the signal sent from the mobile radio device 100 is received by the antenna section of the radio base station 30 and input to the radio reception circuit 35. FIG. 2(b) schematically shows this upstream input signal. That is, time slot 5LJ1. SU2. ...Sun is a mobile radio 1110
0-1, 100-2° . . . , transmission signals addressed to the wireless base station 30 from 100-n are shown. Also, each time slot su1. The details of the contents of su2, .

However, depending on the distance between the radio base station 30 and the mobile radio device 100 or the signal speed, the synchronization signal may be omitted.

Now, the input signal arriving at the radio base station 30 from the mobile radio l1100 is demodulated in the radio receiving circuit 35, and then transmitted to the signal selection circuit group 39-1 of the open gate exchange 20. Among the signals arriving at the barrier exchange 20, the control signal is immediately applied to the control section 40 of the communication control section 45. However, depending on the size of the speed conversion rate, the signal speed restoration circuit group 3B-
It is also possible to add the output from the output of 1 to the communication control unit 45. Further, the call signal is applied to the signal selection circuit group 39-1. A timing signal from a timing generation circuit 42 that generates a predetermined timing is applied to the signal selection circuit group 39-1 according to a control signal instruction from the communication control unit 45, and synchronization is performed for each time slot SU1 to Sun. signal.

The call signal and/or control signal are separated and output.

After passing through the switch group SW, each of these signals is input to the signal speed restoration circuit group 38-1.

This circuit has the function of performing inverse conversion of the speed conversion circuit 131 (FIG. 1B) in the mobile radio device 100 on the transmitting side, thereby faithfully reproducing the original signal and sending it to the wired exchange 18. It turns out.

Furthermore, the wired system and wireless system switch 18 of the barrier switch 20
and 19 exchange functions will be explained.

First, regarding the wired exchange 111B, regarding an incoming call from the telephone network 10, the telephone I1200 (FIG. 1A) or the mobile radio 100 is identified, and the telephone I! 200, the incoming call is established without going through the wireless exchange 111B. The same applies to incoming calls from telephone 200 to telephone network 10.

On the other hand, in the case of an incoming call addressed to the mobile radio device 100, control information is transmitted to the control unit 40 of the communication control unit 45, and the incoming call is transmitted to the wireless system exchange 19. Upon receiving this signal, the wireless exchange 19 recognizes which wireless base station 30's service area the called mobile wireless device 100 is currently in by searching the ID information storage circuit 43 within its own device. Then, the switch group SW, which is an exchange circuit, is operated to send an incoming call signal to the corresponding wireless base 830.

Similarly, when a call is received from the mobile radio 1fi100 to the telephone 200 or the telephone network 10, the wired exchange 1
8, the wired exchange 18 is operated, and the line is connected from the wireless system to the wired system. Note that calls made and received between a plurality of mobile radio devices 100 are made using the radio system exchange I! It is possible to process with only 19.

The aspect of the radio signal used for communication between the radio base station 30 and the mobile radio m1oo will be explained using the required transmission band and the relationship between this and the adjacent radio channel.

As shown in FIG. 1C, the control signal from the control section 40 is applied to the wireless transmission circuit 32 as an output of the signal allocation circuit group 52-1. Next, in the mobile radio device 100, the first
As shown in Figure B, the circuit configuration is required when one channel is used as a communication path among the functions of the wireless base station 30. Original signal, for example, audio signal (0.3kH2~3.0
kH2) is the signal speed conversion circuit group 51-1 (Fig. 1C)
The frequency distribution on the output side when passing through is as shown in FIG. 3B. In other words, as mentioned above, if the audio signal is 1
If transformed by a factor of 5, the frequency distribution of the signal is as shown in Fig. 3B <,I! , 5kHz to 45kHz. Although the frequency distribution of the signal is expanded here, the form of the waveform is simply stretched along the frequency axis, and the waveform itself remains unchanged. FIG. 3B shows a case where the control signal is simultaneously transmitted using the lower frequency band of the audio signal. Among these signals, control signals (0.2~4゜0kHz > and telephone calls @CH
I (expressed as SDl at 4,5-45kH2)
is accommodated in a time slot, say SDl. The same applies to the audio signals accommodated in the other time slots SD2 to S[)n.

That is, time slot so; c+=2°3, -
, n> accommodates a control signal (0.2 to 4.0 kHz) and a communication signal CHi (4.5 to 45 kHz).

However, the signals in each time slot are arranged in chronological order, and the signals in a plurality of time slots are not applied to the wireless transmission circuit 32-1 at the same time.

These call signals are sent to the wireless transmission circuit 32 along with control signals.
-1, the required transmission band requires at least fo±45kl-fz. However, fo 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 51-1 is limited to a certain value due to the limitations on these frequency intervals. The frequency intervals of the plurality of wireless channels are f, 8. If f□ is the maximum signal speed due to the above-mentioned speed increase of the audio signal, then 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 raise the scale on the horizontal axis by about one digit in Figure 3B, which explains the case of analog signals. Although it is necessary to read it, the relationship in the above equation also holds true in this case.

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

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

When the mobile radio ll1100 is turned on,
In the radio receiving circuit 135 of FIG. 1B, the downlink (radio base station 30→mobile radio device 100) radio channel (channel CH
Start capturing the control signal included in the control signal (denoted as I).

If the system is provided with more than one radio channel, i) the radio channel exhibiting the highest received input electric field; ii) the radio channel dictated by the control signal contained in the radio channel; and iii) the radio channel within the radio channel. A radio channel (hereinafter referred to as channel CH1), such as a channel with an empty time slot among the time slots, enters the receiving state according to the procedure determined by the respective system. This is possible by capturing the synchronization signal within the time slot SDi shown in FIG. 2(a). In the control unit 140, the synthesizer 121-1
A control signal is sent to switch 1 to generate a local frequency that enables reception of wireless channel CH1.
22-1 is also tilted and fixed to the synthesizer 121-'l side.

Therefore, when the receiver of the telephone unit 101 is taken off-hook (starts making a call) ($201, FIG. 4A), the synthesizer 121-2 of FIG. A control signal to be generated is received from the control unit 140.

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

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

To capture the time slot Sun, the following method is generally used. The control signal transmitted from the radio base station 30 includes a synchronization signal and a subsequent control signal, as shown in FIG. Roughly speaking, this control signal includes IIJill information such as currently used time slots and unused time slots (empty time slot display). Slot SDi (i=1.2.
...n) may contain only synchronization signals and call signals when they are being used by other communications, but even in such cases, unused time slots usually contain synchronization signals and control signals. is included, and by receiving this control signal, the mobile radio device 100 can determine which time
It is possible to know whether to send a calling signal using the slot.

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

In other systems, there may be no empty slot indication in any of the time slots, in which case the following audio length message @sD1°SD2. ..., 3
1) It is necessary to search for the presence or absence of n one after another and check for empty time slots.

The mobile radio device 100 that receives the control information sent from the radio base 830 by one of the above methods determines in which time slot it should send the call control signal, including the transmission timing. It can be judged based on

Therefore, assuming that the time slot Sun for the uplink signal is an empty slot, it is decided to use this empty time slot, and the necessary timing is taken from the response signal from the radio base station 30 by sending out a control signal for calling. It is possible to send out burst-like control signals by outputting ().

Now, assuming that the calling control signal from the mobile radio device 100 is successfully received by the radio base station 30, this information is immediately transmitted to the communication control section 45 of the barrier exchange 20 via the transmission path. Then, when the ID (I-specific number) of the mobile radio device 100 is detected (S202>, the communication control unit 45 determines the current operating time of the radio base station 30 in charge of the service area where the mobile radio device 100 exists. - Search for a slot by operating the wireless channel information storage circuit 44.

For example, if the time slot SD1 is vacant, the mobile radio 100 uses the time slot SD1 of the radio channel C1l and the downlink control signal causes the mobile radio 100 to change the time slot up (mobile radio 100→radio base station). 30) SUL.

and instructs to use the corresponding downlink (radio base 830→mobile radio device 100) SDl (S203
>. In response, the mobile radio 11100 transitions to a state in which it can receive data in the designated time slot SD1, and at the same time, the mobile radio 11100 shifts to a state in which it can receive data in the designated time slot SD1, and also changes the time slot 5UI (see FIG. 2), which is the time slot for the uplink radio channel corresponding to the downlink time slot SDI. b) Select ). At this time, the mobile radio l1100
The control unit 140 operates the transmission/reception intermittent controller 123 and starts operating the switches 122-15 and 122=2 (3204>. At the same time, a slot switching completion report is sent to the radio base station using the uplink time slot SUI. 30 (5205) and waits for a dial tone (3206>).

In addition to time slot SU'1, the radio base station 30 also receives SU' as an uplink signal from another mobile radio l1100.
3 and Sun are included in one frame and sent.

The wireless exchange 19 that has received the slot switching completion report (3207) turns on the switch group SW and sends a calling signal to the wired exchange 18 (5208). , and turns on the necessary switches among the switches included in the wired exchange 1B (3209), and sends out a dial tone (3210, Fig. 4B). This dial tone is Transferred by the wireless exchange 19 (S
211>, the mobile radio device 100 confirms that the communication path has been set (S212). When transitioning to this state, mobile radio I! Since a dial tone is heard from the handset of the telephone section 101 of 1100, transmission of a dial signal begins. This dial signal is speed-converted by the speed conversion circuit 131 and sent out from the wireless transmission circuit 132 including the transmission section 134 and the transmission mixer 133 using the uplink time slot SU1 (3213). Thus, the transmitted dial signal is received by the radio reception circuit 35 of the radio base station 30 and sent to the communication control unit 45 that controls the radio exchange 19. Wireless system exchange [In 1999, mobile radio equipment 100
In response to the calling signal from , the time slot to be used is given, and the signal selection circuit group 39 and the signal allocation circuit group 52 of the wireless system exchange 19 are operated to receive the uplink time slot SU1, The state has shifted to transmitting the downlink time slot SDI signal. Therefore, the dial signal transmitted from the mobile radio 100 passes through the signal selection circuit group 39 and is then input to the signal speed restoration circuit group 38, where the original transmission signal is restored and the call signal is sent to the wired exchange V118. (3214
>. The wired exchange 18 sets a call path to the called telephone (or telephone @200> in the telephone network 10 (S21)
5).

On the other hand, an input signal from the telephone network 10 (or telephone 11200) (initially a control signal, a call signal when a call is started)
is connected to wireless exchange 11 via wired exchange 1!118.
At 119, the signal speed is converted by the signal speed converting circuit group 51, and the signal passing through the switch group SW is given a time slot SD1 by the signal allocating circuit group 52. The signal is then sent to the radio base station 30 via the transmission path, and is transmitted from the radio transmission circuit 32 to the mobile radio [1100] using the time slot SD1 of the downlink radio channel. The mobile radio 11100 is waiting for reception in the time slot SDI of the radio channel CH1, and the radio receiving circuit 13
5 and its output is input to the speed recovery circuit 138. In this circuit, the original signal of the transmission is restored and input to the handset of the telephone section 101. Thus, a call is started between the mobile radio 11100 and a regular telephone within the regular telephone network 10 (S216).

The call is terminated by on-hooking the handset of the telephone unit 101 of the mobile radio l1100 (S217>, the end-of-call signal and the on-hook signal from the control unit 140 are sent from the wireless transmission circuit 132 via the speed conversion circuit 131. Wireless base 830
(3218>, the control unit 140 stops the operation of the transmission/reception intermittent controller 123, and fixes the switches 122-1 and 122-2 to the output terminals of the synthesizers 121-1 and 121-2, respectively. .

On the other hand, the wireless base station 30 transmits this signal to the wireless exchange 19.
Transfer to. When the communication control unit 45 that controls the wireless exchange 1119 receives the call termination signal from the mobile radio 100, it confirms the termination signal 5219>, turns off the switch group SW, and at the same time transmits the termination signal to the wired exchange 18. When the signal is transferred (3220) and the wired exchange 111B receives this call termination signal (3221), the switch group (not shown) is turned off to end the call (3222).

At the same time, the signal selection circuit group 39 and signal allocation circuit group 52 in the wireless exchange 19 are opened.

In the above explanation, wireless system exchange I! 19 and mobile radio 100
Control signals are exchanged between the signal speed conversion circuit group 51 and
．． Although it has been explained that the signal speed restoration circuit group 38 etc. are not passed through, this is for the convenience of explanation, and communication can be carried out without any problem even if it is passed through the signal speed conversion circuit group 51 and the signal speed restoration circuit group 38 in the same way as with audio signals. It is possible.

(2) Mobile radio I! Incoming mobile radio ll1 to l1100
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 waiting state to receive a downlink control signal of the radio channel CH1 in accordance with the procedure defined by the system.

Assume that an incoming call signal from the general telephone network 10 (or telephone 11200) to the mobile radio device 100 arrives at the wireless exchange 19 via the wired exchange 18.

This control signal is immediately transmitted to the communication control section 45. Then correspondence system! ! The first part 45 searches the ID information storage circuit 43 to confirm the current location of the mobile radio 11100, then searches the radio channel information storage circuit 44 of the radio base station 30 that manages the service area, and stores the mobile SM device 100. The mobile radio 111 uses an empty slot among the downlink time slots of the destination radio channel CHI, for example, SDl.
The radio base station 30 transmits an ID signal of 00, an incoming call signal display, a signalman time slot use signal (for example, SUI corresponding to SDl is used for transmission from the mobile radio 11100).

In the mobile radio device 100 that receives this signal, it is transmitted from the receiving section 137 of the radio receiving circuit 135 to the control section 140. The control unit 140 transmits this signal to its own mobile radio 111.
To confirm that it is an incoming call signal to 00, telephone section 1
At the same time, the designated time slot SD1. The transmission/reception intermittent controller 123 is operated to stand by at SU1, and the switch 122 is activated.
-1. Start turning on and off 122-2. In this way, the state has shifted to a state in which calls can be made.

[Effects of the Invention] As is clear from the above description, by applying the present invention to a mobile communication system, it can be made smaller and lighter.

The effects of the present invention are extremely large because it has become possible to have a simple circuit configuration of a wireless base station, and it has become easier to save power and maintain it.

[Brief explanation of drawings]

FIG. 1A is a block diagram showing a barrier switch and a wireless base station used in the system of the present invention, FIG. 1B is a circuit diagram of a mobile radio device used in the system of the present invention, and FIG. 1C is a block diagram of a mobile radio device used in the system of the present invention. Figure 2 is a time slot structure diagram for explaining the time slots used in the system of the present invention; Figures 3A and 3B are call signal and control diagrams. FIG. 3C is a spectral diagram showing a signal spectrum; FIG. 3C is a circuit configuration diagram for multiplexing an audio signal and a data signal; FIGS. 4A and 4B are flow charts showing the flow of operation of the system according to the present invention. O... Telephone network 18... Wired exchange 9.
...Radio system exchange 20...Gate opening switch 1...Transmission line 30...Radio base station 2...Radio transmitting circuit 35...Radio receiving circuit 8...Signal speed restoration circuit group 9... - Signal selection circuit group 40...Control unit 1...Clock generator 2...Timing generation circuit 3...ID information storage circuit 44...Radio channel information storage circuit 51...Signal speed conversion circuit Group 52...Signal allocation circuit group 91...Digital encoding circuit 92...Multiple conversion circuit 100...Mobile radio 101...Telephone section 120...Reference crystal oscillator 121-1, 121- 2...Synthesizer 122-1
．． 122-2...Switch 123...Transmission/reception intermittent controller 131...Speed conversion circuit 132...Wireless transmission circuit 134...Transmission section 136...Reception mixer 138...Speed restoration circuit 200- ...Telephone m. 133...Transmission mixer 135...Radio receiving circuit 137...Receiving section 141...Clock regenerator agent 1) Kosan (1 person) 3850 H
z Figure 3A

Claims (1)

[Claims] Radio transmitting means (32) for receiving a signal accommodated in a time slot and transmitting a radio signal to a mobile radio
), and a radio receiving means (35) for receiving the radio signals whose speeds of the plurality of divided signals from the mobile radio device are respectively converted to high speeds and accommodated in the time slots to obtain a received signal. a wireless base means (30) consisting of; a switch means (SW) for exchanging a wireless received signal and a wireless transmitted signal to enable transmission and reception in the wireless base means; signal selection means (39) for receiving a received signal, selecting a predetermined time slot and transmitting the selected time slot as the wireless system reception signal to the switch means; and receiving the wireless system reception signal via the switch means. a signal speed restoring means (38) for converting the signal included in the time slot to a low speed and restoring and outputting the continuous signal before being divided in the mobile radio device; and as the radio system transmission signal. Signal speed converting means (51) receives an input signal to be transmitted, divides it into a plurality of parts, converts each into high speed, and applies the converted signals to the switch means, and receives the output of the signal speed converter via the switch means. , a signal allocation means (52) for allocating and accommodating the signals divided into a plurality of parts and each converted at high speed into predetermined time slots, and transmitting the signals to the wireless transmission means as signals accommodated in the time slots; and a telephone. connected to means (10, 200) by a transmission line;
Wired exchange means (18) connected to the output side of the speed restoration means and the input side of the signal speed conversion means for exchanging to enable communication between the telephone means and the mobile radio. ) and a time-division communication system in mobile communications.