JPH05175898A - Time division communication method for mobile object communication - Google Patents

Abstract

PURPOSE:To effectively utilize frequencies and to take measures to cope with the congestion of traffic in the case of mobile object communication loading time compressed telephone signals on the time slot of frame constitution. CONSTITUTION:The signals of respective communication are divided into a low frequency and a high frequency by using a gate exchange 20 for exchanging communication between each radio base station 30 and each mobile radio equipment 100 which moves across plural zones and uses a radio channel loading time compressed and partitioned signals on the time slot of frame constitution for communication with the radio base station 30, the low frequency and high frequency for one kind of communication are defined as time piece signals L1 and H1, those frequencies of the other communication are defined as L2 and H2, and one time slot contains the L1 and the H2 or the L2 and the H1. Thus, one base station 30 enables communication with the double number of mobile radio equipments 100.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a time division communication method of a wireless communication channel in mobile communication using a signal having a band characteristic of a telephone or the like, in which a multiple load gain and frequency of a modulated time compression multiple signal are included. The present invention relates to a method for improving effective use and communication traffic resistance. More specifically, a radio channel is provided and used by one of the many mobile radios in the service area.
Effective use of frequency when another mobile wireless device starts communication with another wireless base station using the same wireless channel while communicating with the opposite wireless base station by setting a wireless line. For the reasons above or due to radio wave propagation characteristics, it is possible to eliminate the adverse effect on the communication between the mobile wireless device and the wireless base station that are communicating, and at the same time, reduce the effective utilization of the frequency by decreasing the transmission output. It aims to provide an improved method and an economical system using it.

[0002]

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

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

Reference 2. Ito "Study on mobile phone system-Theoretical study on time-division time-compression FM modulation system"
RCS89-39 October 1989

Reference 3. Ito "Study on mobile phone systems-Study on multipath propagation characteristics of time division time compression multiple FM system-"
IEICE Technical Report RCS89-47 January 1990

Reference 4. Ito "Elucidation of multiple load gain of time division time compression multiplex telephone signal and its application to FM mobile communication" IEICE Technical Report RCS89-65 Mar. 1990.

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

Next, in Document 2, the above-mentioned TCM is used.
(Time-division time compression multiplexing) -Adjacent channel interference and co-channel interference, which are problems when the FM system is applied to a small zone, are being studied, and the system can be realized by selecting system parameters appropriately. The possibility is shown.

Further, in Reference 3, the effect of multipath fading that a TCM signal receives during transmission in space is examined, and guard time is set between time slots as a measure for removing or reducing this effect. I suggest you do.

Further, in Reference 4, the multiplex load gain, which has been known to exist in FDM (frequency division multiplex) signals in the past, has a multiplex load gain similar to the FDM signal in the time division time compression multiplex (TCM) system. Reveal that, and
It explains the quantification and operation examples of the system. Then, by using this multiple load gain to deepen the modulation depth of the FM, the transmission power can be significantly reduced, and it is expected that the mobile wireless device can achieve a significant power saving. Has been reported.

[0011]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the system construction example shown in FIG. 1, a general description of a mobile communication system using a TCM signal is given. Although the system construction is possible by this, it is compressed in time slots of a frame structure. In the case of transmitting all the separated signals, when deleting some of the frequency components of the signal and transmitting, for example, of the frequency components of the signal that the time piece signal has, first the lower half, Next, there is no description of a method that enables effective use of frequencies that are alternately transmitted such as the upper half and measures for congestion of communication traffic. Although Document 4 describes the multiple load gain relating to the signal power of the TCM signal, it is a case where all the time-compressed and delimited signals are transmitted in the time slots of the frame structure, and a part of the frequency components is transmitted. The effect of deleting and sending was not clarified, and an unresolved issue remained.

[0012]

In a mobile communication system using a TCM (time division time compression multiplex) signal, a time-compressed delimited signal is placed in a time slot of a frame structure as a transmission signal. It is usually sent. Therefore, in order to enable effective use of frequencies and measures against congestion of call traffic, the transmission of all of the time-compressed delimited signals was revised and partly deleted, for example, added to time slots. Among the frequency components of the signal being transmitted, we decided to alternately transmit the lower half first and then the upper half. As a result, the amount of signals to be transmitted is reduced, and the amount can be diverted to other communications.

[0013]

In the communication using the TCM signal, a large number of telephone signals are disconnected as transmission signals at fixed time intervals (this is called a time piece signal), and this is, for example, 10 times.
In the case of multiplexing, it is compressed ten times in time and arranged at the position of the time slot number given to each of the 10 time slots prepared in the frame structure.
And the normal case would be to send all of these compressed signals in order, but if you, for example, don't send all the frequency components of the signal being added to the time slot, remove some of them, For example, the lower half of the frequency components of the signal and then the upper half of the signal are alternately transmitted. As a result, the quality of the received signal naturally deteriorates. However, when the time piece signal is created, the deterioration amount can be minimized depending on the time length. 1/3 according to the experimental results of the inventors of the present application
That is, even if the frequency components of the time slot signals arranged in time are divided into upper, middle, and lower equal parts, and these are transmitted in order, the signal quality deterioration is within the practically allowable limit. It became clear.

When the above is implemented, for example, if the frequency components of the signal accommodated in the time slot are alternately transmitted first in the lower half and then in the upper half, the high frequency component in the first signal is transmitted. Is not included,
This is diverted to other communication (provided that the frequency component of the lower half band is not included). Since the next signal does not include the frequency component of the lower half band, it is diverted to another communication (provided that the frequency component of the upper half is not included). As a result, the TCM signal, which was conventionally used for only one communication, can be used for two communication, and the effective frequency utilization is doubled.

On the other hand, if the above measures are applied when the call traffic is congested, the number of usable call channels is increased, and the state where the call cannot be made conventionally is improved. Therefore, the above measures can be used as a countermeasure against the call traffic congestion, and it has become possible to construct a more economical system.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1, 2 and 3 show a system configuration for explaining a basic operation example of communication using a TCM signal of the present invention.

In FIG. 1, 10 is a general telephone network, and 20 is a gateway switch for switching and connecting the telephone network 10 and a wireless system. Reference numeral 30 denotes a wireless base station, which is an interface with the gateway switch 20, a circuit for converting a signal speed, a circuit for allocating and selecting a time slot,
There is a control part etc., besides setting and releasing the wireless line,
It has a wireless transmission / reception circuit for exchanging wireless signals with the mobile wireless device 100 (100-1 to 100-n).

Here, the gateway exchange 20 and the radio base station 30
And the communication lines 22-1 to 22-n including the call signals of the call channels CH1 to CHn and the control signals.

FIG. 2 shows a circuit configuration of the mobile radio 100 which communicates with the radio base station 30. A received signal such as a control signal or a call signal received by the antenna unit is received by the wireless receiving circuit 13 including the receiving mixer 136 and the receiving unit 137.
5, and the output communication signal is the speed restoration circuit 1
38, the control unit 140, and the clock regenerator 141. The clock regenerator 141 regenerates a clock from the received signal and applies it to the speed restoration circuit 138, the control unit 140, and the timing generator 142.

The speed restoring circuit 138 restores the speed (pitch in the case of an analog signal) of the compressed and delimited communication signal in the received signal and inputs it to the telephone unit 101 and the control unit 140 as a continuous signal. ing.

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

The output of the modulator included in the transmission unit 134 is converted into a predetermined radio frequency in the transmission mixer 133,
The signal is transmitted from the antenna unit and received by the wireless base station 30. In order to transmit a radio signal to the radio base station 30 using the time slot permitted to be used by the mobile radio device 100, the timing information from the timing generator 142 shown in FIG. Must have been obtained by

The timing generator 142 supplies necessary timing to the transmission / reception interrupt controller 123, the speed conversion circuit 131 and the speed restoration circuit 138 by the clock from the clock regenerator 141 and the control signal from the control unit 140. There is.

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

A radio base station 30 is shown in FIG.
N-channel communication signal 22-1 with the gateway switch 20
22 to 22-n are connected to the signal processing unit 31 that forms an interface on the transmission path. Therefore, the communication signals 22-1 to 22-n sent from the gateway switch 20 are transmitted to the wireless base station 30.
Is input to the signal processing unit 31. The signal processing unit 31 includes an amplifier for compensating for transmission loss,
So-called 2-line to 4-line conversion is performed. That is, the input signal and the output signal are mixed and separated, and the input signal from the gateway switch 20 is sent to the signal speed conversion circuit group 51. Further, the output signal from the signal speed restoration circuit group 38 uses the same transmission line as the input signal in the signal processing unit 31, and the gateway exchange 20
Sent to. Of the above, the input signal from the gateway switch 20 is input to the signal speed conversion circuit group 51 including many signal speed conversion circuits 51-1 to 51-n, and the speed (pitch) conversion is performed by dividing the signal speed conversion circuit group 51 at predetermined time intervals. receive. As for the signal transmitted from the wireless base station 30 to the gateway switch 20, the output of the wireless receiving circuit 35 is input to the signal speed restoration circuit group 38 via the signal selection circuit group 39, and the speed (pitch) is converted. It is input to the signal processing unit 31.

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

Next, the function of the signal speed conversion circuit group 51 (FIG. 3) will be described. The input signal such as a voice signal or a control signal, which is divided into a certain time length, is stored in a storage circuit, and the speed is changed when reading the input signal, and the read signal is read at a speed of, for example, 15 times that of the storage time. Can be compressed. The principle of the signal speed conversion circuit group 51 is
This is the same as playing back the sound recorded by a tape recorder at high speed. In practice, for example, CCD (Char
ge Coupled Device), BBD (Bucket Brigade Devic)
e) can be used, and a memory used in a television receiver or a tape recorder for compressing or expanding the time axis of conversation can be used (reference: Kosaka et al. “Compress time axis of conversation / Expanding Tape Recorder Nikkei Electronics July 26, 1976
92-133).

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

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

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

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

The output signals of the signal speed conversion circuit group 51 are input to the signal allocation circuit 52, and time slots are given in a predetermined order. SD in Figure 4 (a)
, SD2, ..., SDn indicate that the speed-converted communication signals are assigned to each time slot. Here, in one time slot, a synchronizing signal and a call signal or / and a control signal are accommodated as shown in the figure. When the call signal is not installed, an empty slot signal is added to the call signal portion only with the synchronization signal, or in some systems, no signal including the carrier wave is transmitted. In this way, as shown in FIG. 4A, in the wireless transmission circuit 32, a signal forming one frame in the time slots SD1 to SDn is added to the modulation circuit. The multiplex signals time-serialized to be transmitted are angle-modulated in the wireless transmission circuit 32, and then transmitted to the space from the antenna section.

Regarding the transmission of the control signal between the radio base station 30 and the mobile radio 100 prior to the telephone call when making or receiving a telephone call, regardless of whether the telephone signal is in the band or out of the band. It is possible. FIG. 5 shows these frequency relationships. That is, in the figure (a), an example of the out-of-band signal is shown, 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. 5B shows an example of the in-band signal, which is used at the time of making and receiving calls.

Although the above-mentioned examples are all for tone signals, it is possible to transmit various kinds of signals at high speed by increasing the number of tone signals or by modulating the tones to form subcarrier signals. Becomes

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

On the other hand, the signal transmitted from the mobile radio 100 is received by the antenna section of the radio base station 30 and input to the radio receiving circuit 35. FIG. 4B schematically shows the upstream input signal. That is, the time slots SU1, SU2, ..., SUn represent transmission signals addressed to the radio base station 30 from the mobile radios 100-1, 100-2, ..., 100-n. The contents of each of the time slots SU1, SU2, ..., SUn are shown in detail in the lower left of FIG. 4 (b) and consist of a call signal and / or a control signal. However, the synchronization signal can be omitted depending on the case where the distance between the mobile wireless device 100 and the wireless base station 30 is small or the signal speed. Further, when the waveform of the radio carrier of the uplink radio signal in the time slot is schematically shown in FIG.
It becomes like (c). Similarly, the transmission waveform from the wireless base station 30 to each mobile wireless device 100 is as shown in FIG.

The control signal of the input signals arriving at the radio base station 30 is immediately added to the control section 40 from the radio reception circuit 35. However, depending on the size of the speed conversion rate, it is also possible to add the signal from the output of the signal speed restoration circuit group 38 to the control unit 40 after performing the same processing as the call signal. The call signal is applied to the signal selection circuit 39. The signal selection circuit group 39 includes a control unit 4
According to the instruction of the control signal from 0, a timing signal from a timing generation circuit 42 that generates a predetermined timing is applied, and a synchronization signal, a call signal or a control signal is separately output for each time slot SU1 to SUn.

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

Hereinafter, an aspect of transmitting the signal space according to the present invention will be described with reference to a required transmission band and a relationship between the required transmission band and adjacent radio channels.

As shown in FIG. 3, the control signal from the control unit 40 is applied to the radio transmission circuit 32 in parallel with the output of the signal allocation circuit 52. However, depending on the size of the speed conversion rate, after the same processing as the call signal is performed, the signal allocation circuit 5
It is also possible to add from the output of 2 to the wireless transmission circuit 32.

Next, in the mobile wireless device 100, as shown in FIG.
As shown in FIG. 5, the circuit configuration is required when the communication path among the functions of the wireless base station 30 is one channel.

Original signal, eg voice signal (0.3 kHz-
The frequency distribution on the output side when 3.0 kHz) passes through the signal speed conversion circuit group 51 (FIG. 3) is as shown in FIG. That is, if the audio signal is converted 15 times as described above, the frequency distribution of the signal is as shown in FIG.
It means that the frequency is expanded to 4.5 kHz to 45 kHz. Although the frequency distribution of the signal is expanded here, it should be noted that the shape of the waveform simply undergoes a similarity transformation in which the frequency axis is stretched, and the waveform itself does not change. This is necessary when determining the value of the multiple load gain.

Now, FIG. 8 shows a case where the control signal is simultaneously transmitted by using the lower frequency band of the audio signal. Of these signals, control signals (0.2 to 4.0)
kHz) and the speech signal CH1 (represented as SD1 at 4.5-45 kHz) are contained in a time slot, for example SD1. The same applies to audio signals accommodated in the other time slots SD2 to SDn.

That is, the time slot SDi (i =
2, 3, ..., N) is a control signal (0.2 to 4.0 kH)
z) and the communication signal CHi (4.5 to 45 kHz). However, the signals in each time slot are arranged in time series, and the signals in a plurality of time slots are not added to the wireless transmission circuit 32 at the same time.

The above control signal is not implemented when a time slot for the control signal is provided at the beginning of the frame, and when the lower frequency band is used for another signal, the communication signal is not used. Near the frequency band of (4.1 to 4,4
KHz or 46-46.5 kHz).

When these call signals are added to the angle modulator included in the radio transmission circuit 32 together with the control signal, a required transmission band of at least f _C ± 45 kHz is required. However, f _C is a radio carrier frequency. If there are a plurality of wireless channels given to the system, the speedup of signals by the signal speed conversion circuit group 51 is limited to a certain value due to the limitation of these frequency intervals. The frequency interval of a plurality of wireless channels is f
Let _rep be the maximum signal speed due to the speedup of the above-mentioned audio signal be f _H, and the following inequality must be established between them. f _rep > 2f _H On the other hand, in the case of a digital signal, the voice is usually digitized at a speed of about 64 kb / s. Therefore, it is necessary to read the scale of the horizontal axis in FIG. However, the relation of the above equation holds in this case as well.

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

Next, the operation of making and receiving a call in the basic operation of the system according to the present invention will be described by taking the case of a voice signal as an example.

(1) Calling from mobile radio device 100 will be described with reference to the flowcharts shown in FIGS. 9 and 10.

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

Therefore, turn off the handset of the telephone unit 101.
When hooked (start of calling) (S201, FIG. 9), the synthesizer 121-2 of FIG. 2 receives from the control unit 140 a control signal for generating a local oscillation frequency that enables transmission of the radio channel CH1. Also, the switch 122-2 is also tilted to the synthesizer 121-2 side to be in a fixed state.
Next, the call control signal output from the telephone unit 101 is transmitted using the radio channel CH1. This control signal is
This is transmitted by means of the frequency band shown in FIG. 5, for example using the time slot SUn.

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

To capture the time slot SUn,
Specifically, the following method is used. As shown in FIG. 4A, the control signal transmitted from the wireless base station 30 includes a synchronization signal and a control signal that follows it. The mobile wireless device 100 receives the synchronization signal and the frame synchronization. It will be possible. In addition, this control signal contains the currently used time slots and the unused time slots (empty time slots).
Control information such as slot display) is included. Depending on the system, time slot SDi (i = 1, 2,
..., n) is being used by another communication,
Sometimes it only contains sync and call signals,
Even in such a case, the unused time slot normally contains a synchronization signal and a control signal, and by receiving this control signal, the mobile radio 100 uses which time slot to issue a call signal. Can be sent.

When all the time slots are in use, it is impossible to make a call on this radio channel and it is necessary to sweep and search another radio channel.

In another system, there is a case where an empty slot is not displayed in any time slot. At this time, the audio multiplexed signals SD1 and SD that follow are displayed.
2, ..., SDn must be searched one after another to check for empty time slots.

Returning to the present discussion, the mobile radio 100, which has received the control information transmitted from the radio base station 30 by any of the above methods, transmits the call control signal at which time slot. Whether or not it should be possible can be determined by including the transmission timing.

Then, the time slot SU for the upstream signal
Assuming that n is an empty slot, this empty time slot is used, a call-out control signal is transmitted, a required timing is extracted from a response signal from the radio base station 30, and a burst-like control signal is generated. Can be sent out.

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

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

As a result, for example, time slot SD
1 is available, the time slot SDn of the radio channel CH1 is used for the mobile radio device 100 by the downlink control signal (time slot uplink (mobile radio device 10)).
0 → Radio base station 30) SU1, and the corresponding downlink (radio base station 30 → mobile radio 100) SD1 is instructed to be used (S203). In response to this, the mobile wireless device 100 shifts to a state in which it can be received at the instructed time slot SD1 and SU1 which is a time slot for the uplink radio channel corresponding to the downlink time slot SD1 (see FIG. Select b)). At this time, in the control unit 140 of the mobile wireless device 100, the transmission / reception gating controller 123 is operated to turn on the switch 122-1.
And 122-2 are started to operate (S204). At the same time, a slot switching completion report is sent to the radio base station 30 using the uplink time slot SU1 (S205),
Wait for dial tone (S20)
6).

The time of the wireless carrier of this upstream wireless signal
The state of the slot SU1 is schematically shown in FIG. 7 (c). The radio base station 30 has a time slot SU
In addition to No. 1, SU3 and SUn are included in one frame and transmitted as an upstream signal from another mobile radio device 100. Upon receiving the slot switching completion report (S207), the wireless base station 30 sends a calling signal together with the ID of the mobile wireless device 100 to the gateway switch 20 (S20).
8). On the other hand, in the gateway switch 20, the mobile radio 10
The ID of 0 is detected, and a necessary switch of the switch group included in the gateway switch 20 is turned on (S209),
The dial tone is transmitted to the wireless base station 30 (S21).
0, FIG. 10).

This dial tone is transmitted to the radio base station 30.
Is transferred to the mobile wireless device 100 (S211), and the mobile wireless device 100 confirms that the communication path has been set (S212).

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

The radio base station 30 has already responded to the calling signal from the mobile radio 100, and has set the time
The slot is given, and the signal selection circuit group 39 and the signal allocation circuit group 52 of the radio base station 30 are operated to receive the upstream time slot SU1 and receive the downstream time slot SU1.
The state has shifted to transmitting the signal of the slot SD1.
Therefore, the dial signal transmitted from the mobile wireless device 100 is the signal selection circuit 39-1 of the signal selection circuit group 39.
After passing through, it is input to the signal speed restoration circuit group 38, where the original transmission signal is restored and transferred to the gateway exchange 20 as the call signal 22-1 via the signal processing unit 31 (S21).
4) The call path to the telephone network 10 is set (S21).
5).

On the other hand, an input signal (initially a control signal, a call signal if a call is started) from the gateway switch 20 is subjected to speed conversion by the signal speed conversion circuit group 51 in the radio base station 30, and then the signal allocation circuit. Signal allocation circuit 52-1 of group 52
Has given a time slot SD1. Then, the time of the downlink radio channel from the radio transmission circuit 32
It is transmitted to the mobile wireless device 100 using the slot SD1.

In the mobile radio 100, the radio channel CH
In the time slot SD1 of No. 1, the wireless communication circuit 135 is on standby for reception, and its output is input to the speed restoration circuit 138. In this circuit, the original signal on the transmitting side is restored and input to the handset of the telephone section 101.
Thus, a call is started between the mobile wireless device 100 and the ordinary telephone in the ordinary telephone network 10 (S21).
6).

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

On the other hand, in the control section 40 of the radio base station 30,
When the call end signal from the mobile wireless device 100 is received, the call end signal is transferred to the gateway switch 20 (S219), the switches of the switch group (not shown) are turned off to end the call (S).
220). At the same time, the signal selection circuit group 3 in the radio base station 30
9 and the signal allocation circuit group 52 are opened.

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

(2) Incoming Call to Mobile Radio 100 It is assumed that the mobile radio 100 is in a standby state with the power turned on.
In this case, as described in the section of calling from the mobile radio 100, the downlink control signal of the radio channel CH1 according to the procedure defined by the system is in the standby state.

An incoming call signal from the general telephone network 10 to the mobile radio 100 via the gateway switch 20 is transmitted to the radio base station 30.
Suppose you have arrived. Similar to the voice signal, these control signals pass through the signal speed conversion circuit group 51 and are transmitted to the control unit 40 (FIG. 3) through the signal allocation circuit group 52, similarly to the voice signal. Then, the control unit 40 uses the empty slot of the downlink time slot of the radio channel CH1 addressed to the mobile wireless device 100, for example, SD1, to move the mobile wireless device 10
0 ID signal + incoming call signal display signal + time slot use signal (for transmission from the mobile radio 100, for example, S
(Use SU1 corresponding to D1). In the mobile wireless device 100 that has received this signal, it is transmitted from the receiving unit 137 of the wireless receiving circuit 135 to the control unit 140. Control unit 1
At 40, since it is confirmed that this signal is an incoming signal to the mobile radio device 100 of its own, at the same time as making a ringing tone from the telephone unit 101, it waits at the instructed time slot SD1, SU1. Transmission / reception intermittent controller 1
23, and switches 122-1 and 12
Turn on and off 2-2. Thus, the call is ready to be made.

Note that it is theoretically explained in Reference 2 that signal transmission is executed in good condition using this system and does not adversely affect other radio channels in the system. Theoretical proof of multiple load gain in telephone signal and its application are also described in reference 4, so they are omitted and the TCM applied to the present invention is described below.
A concrete example that is particularly effective in improving the effective utilization of frequency of the system or as a countermeasure against call traffic congestion will be described.

(3) Measures for Improving Effective Frequency Utilization FIG. 11, FIG. 12 and FIG. 13 are examples of system and time slot configurations for explaining a specific embodiment of the present invention, and FIG. 14 and FIG. 15 is the time of Figure 13
The schematic diagram of the production method which produces a time piece signal using a slot is shown. . 11 is FIG. 2, FIG. 12 is FIG. 3, and FIG.
Correspond to FIG. 4, respectively, so that FIG. 2, FIG. 3, and FIG.
The explanations for the above are omitted, and the explanation will focus on the newly added functions.

FIG. 11 differs from FIG. 2 in that a reception signal selector 171 and a transmission signal selector 172 are inserted.

12 is different from FIG. 3 in that a received signal selection circuit group 71 including received signal selection circuits 71-1, 71-2, ..., 71-n and a transmitted signal selection circuit 72-.
The point is that a transmission signal selection circuit group 72 including 1, 72-2, ..., 72-n is inserted.

The mobile wireless device 100B shown in FIGS. 11 and 12.
And the reception signal selector 17 included in the radio base station 30B
1, a transmission signal selector 172 and a reception signal selection circuit group 71,
A state of signal processing when the transmission signal selection circuit group 72 and the transmission signal selection circuit group 72 transmit and receive using the time slot shown in FIG. 13 will be described.

FIG. 14A shows each time shown in FIG.
Creating slot SD or SU (of which SD
1a and SD1b are used), and are schematic diagrams of a method for creating a time piece signal of a certain telephone signal (frequency component 0.3 to 3.0 kHz). The horizontal axis represents time, and the vertical axis represents frequency components of the signal (however, the shaded area is deleted after band limitation). The first telephone signal is obtained by filtering a frequency component of the signal of 1.65 to 3.0 kHz with a bandpass filter, and then creating a time piece signal. That is, in FIG. 14A, since each time piece signal L1 contains only 0.3 to 1.65 kHz as a frequency component, it is clear that the frequency effective utilization rate is twice that of the conventional one. Will. Further, the multiple load gain also increases by 3 dB or more, and the transmission power can be reduced. Therefore, consider doubling the number of channels that can be used as a system. To do that, do the following:

In the first method, the frequency components 1.65 to 3.0k of another (second) telephone signal are added to the shaded area in FIG. 14 (a).
Hz may be input as the time piece signal H2.

The second method is to double the time compression of the time piece signal by including only the telephone signal having a frequency component of 0.3 to 1.65 kHz, which is a countermeasure against communication traffic congestion. , Which will be described later.

In the first method shown in FIG. 14A, the second telephone signal has frequency components of 1.65-3.
It must be included only at 0 kHz. The frequency component of the second telephone signal is 0.3 to
The frequency component of 0.3 to 1.65 kHz out of 3.0 kHz may be filtered by the bandpass filter, and then the time piece signal H2 may be created. And both time single signals L1, H
Time slots SD1a and SD1b including 2 are created.

As a result of the above, since two channels are to be used for telephone signals in the ISDN era, it can be seen that the present invention can be realized by using the same frequency band as before when the present invention is applied. However, there is no increase in multiple load gain.

FIG. 14A is suitable for communication traffic congestion countermeasures, but when congestion countermeasures are not required, FIG.
It is superior in performance to create the time piece signal as in (b). In FIG. 14B, the first telephone signal (L1, H1)
Focusing on, first, when creating the first time slot, 1.65 out of the frequency components of the signal
A signal of 3.0 kHz is filtered by a bandpass filter to obtain a time piece signal L1. In creating the time piece signal of the second telephone signal accommodated in the same time slot SD1a (frame number 1-a) as the time piece signal L1, the frequency component of 0.3 to 3.0 kHz within the frequency component 0.3 to 3.0 kHz is generated. 3-1.
It suffices to filter the signal of 65 kHz with a bandpass filter and then create the time piece signal H2.

Then, the second time slot SD1b
When creating (frame number 1-b),
As for the telephone signal, the one having a frequency component of 0.3 to 1.65 kHz is filtered by the bandpass filter to obtain the time piece signal H1. This time piece signal H1
Same time slot SD1b (frame number 1-
In creating the time piece signal L2 of the second telephone signal accommodated in b), the frequency component of 1.65 to 0.3 kHz out of the frequency components of 0.3 to 3.0 kHz is filtered by the bandpass filter, and then , The time piece signal L2 may be created.

Furthermore, the third time slot SD1a
When creating (frame number 2-a), the above-mentioned first time slot SD1a (frame number 1-) is created.
a) as well as the fourth time slot S
When creating Db (frame number 2-b),
Second time slot SD1b (frame number 1-
Similar to creating b), this may be repeated thereafter. However, in this case also, there is no increase in the multiple load gain.

FIG. 14B is superior to FIG. 14A in the following points. i) In FIG. 14A, the frequency component of the time piece signal L1 created from the first telephone signal is 0.3 to 1.65 kHz.
Since the frequency component of the time piece signal H2 generated from the second telephone signal is fixed to z at 1.65 to 3.0 kHz, the former is nasal stuffy voice and the latter is high pitched voice, which is difficult to hear. ii) In FIG. 14B, the first (L1, H1) and the second (L1)
2, H2), the frequency component of the signal is 0.3 to 3.0 kHz, which is the same as the original telephone signal. However, the intelligibility is slightly reduced because only half of the signal frequency band is sent. However, by the measures described below, it is possible to improve the effective utilization of the frequency without substantially degrading the intelligibility and the naturalness of the signal.

In the above description, the frequency component of the telephone signal is converted into each time piece signal (hence, the time
However, it is possible to further improve the effective frequency utilization. For example, the frequency component of the telephone signal may be transmitted only 1/3 in each time piece signal. If so, the effective frequency utilization is tripled. It is also possible to change the frequency component to be transmitted to various values such as 2/5 and 2/3 of the original signal.

On the other hand, when it is not necessary to raise the effective frequency utilization so much, half of the frequency components of the telephone channel used in the system transmit all time piece signals, and the other half use time piece signals. Send only 1/2 or 1
The duty may be set to 70% so that all the time piece signals are transmitted for each frame and half the time piece signals are transmitted in the next frame. Then, a line with a large duty may be distinguished from a high-quality telephone line and a line with a low duty may be distinguished from a low-quality telephone line to discriminate usage charges.

A description will be given of an adverse effect on the communication quality after demodulating the modulated wave on the receiving side by the creation of the time piece signal on the transmitting side and a method for reducing this adverse effect as much as possible. As an example, time slots SD1a, SD1b (wherein the first telephone signal (L
, H1) and the second telephone signal (L2, H2) are used), and FIG.
The communication quality when signals are transmitted in the above format will be described.

FIG. 15A shows an input signal (telephone signals L1 and H) to the telephone unit 101 when the mobile radio 100B receives a signal from the radio base station 30B and takes no measures.
1) is shown. As shown in the figure, the demodulated call signal shows that the frequency component is sent only with a duty of 50%. That is, the frequency component is 0.3 to 1.65k as a useful signal for the slot number SD1a of the frame numbers 1-a, 2-a, 3-a, ... Shown in FIG.
Only Hz is included, and only noise is included in 1.65 to 3.0 kHz. On the other hand, frame numbers 1-b and 2
Slot numbers SD1b of −b, 3-b, ... Contain only 1.35 to 3.0 kHz frequency components as useful signals, and 0.3 to 1.65 kHz only noise. ing. If it is left as it is, it will have a bad influence on the call quality and will be difficult to use. On the other hand, FIG. 15B shows an example of a measure (comprising a signal shaping circuit (not shown)) for reducing this adverse effect. In the figure, frame numbers 1-b,
The time slot number SD1a of the frame number 1-a, 2-a, 3-a, ... As the signal of the time slot number SD1b corresponding to 2-b, 3-b, ... Signal is duplicated and added as a dummy signal L1d. Further, frame numbers 1-a, 2-a, 3
Frame number 1-b, 2-which is the previous signal as the signal of slot number SD1a corresponding to -a, ...
The signals of the slot number SD1b corresponding to b, 3-b, ... Are duplicated and added as the dummy signal H1d.
By such measures, the adverse effect on the call quality is considerably reduced.

Now, what kind of time length is preferable for the time piece signal of the TCM signal will be explained. Obviously, it is better that the time length is shorter (for example, 1 msec rather than 10 msec). However, if it is too short, the efficiency in signal processing deteriorates, so there is a fixed limit (about 1 msec). Note that FIG.
Circuit for obtaining the time slot of (b) (signal shaping circuit)
Can be configured by a known technique, and can be installed in the telephone unit 101.

By the above measures, it is possible to increase the effective frequency utilization rate without causing a significant adverse effect on the call quality.

The generation of the time piece signal (transmission side) described with reference to FIGS. 14 and 15 is performed by the transmission signal selector 172 (FIG. 11).
And the transmission signal selection circuit group 72 (FIG. 12) performs restoration of the original signal on the reception side that receives the time piece signal. The reception signal selector 171 (FIG. 11) and the reception signal selection circuit group 71
(FIG. 12).

FIG. 16 and FIG. 17 show concrete circuit configuration diagrams of one embodiment and another embodiment of the transmission signal selector 172 and the reception signal selector 171 used for improving the effective frequency utilization. Has been done.

The transmission signal selector 17 shown in FIG. 16 (a).
2 includes switches SW21 and SW22, a low pass filter LP21 and a high pass filter HP21. Here, a time piece signal is generated from the mobile radio 100B to the radio base station 30B by the time slots SU1a and SU1b so as to transmit half frequency components of only the low band or the high band for each frame.

The transmission signal from the telephone section 101 is switched by the switch S which is switched by the control signal from the control section 140.
It is applied to the low-pass filter LP21 or the high-pass filter HP21 via W21. Those outputs are taken out through the switch SW22 that performs a switching operation in response to a control signal from the control unit 140, and are applied to the speed conversion circuit 131.

From the mobile radio 100B to the radio base station 30B
The signal to be sent to is the time slot SU1a of the 1-a frame of FIG. 13 (b) (corresponding to SD1a of FIG. 15 (b)).
, The transmission signal from the telephone unit 101 is transmitted in the low frequency range (0.
3 to 1.65 kHz), switch S
W21 and SW22 are connected to the terminal a side to connect the time piece signal L1.
Is getting As a result, only useful low-frequency signals (0.3 to 1.65 kHz) are sent from the telephone unit 101 to the speed conversion circuit 131. And the wireless transmission circuit 1
The antenna transmits the time slot SU1a of the frame number 1-a addressed to the radio base station 30B via 32.

In the next 1-b frame, the signal sent from the mobile radio 100B to the radio base station 30B is as shown in FIG.
(B) 1-b frame time slot SU1b
(Corresponding to SD1b in FIG. 15B) is used to convert the transmission signal from the telephone unit 101 into high frequency components (1.65 to 1.55).
3.0kHz), switch SW2
1, SW22 are connected to the terminal b side to obtain the time piece signal H1.

In the next frame, the mobile radio 1
The signal sent from 00B to the wireless base station 30B is as shown in FIG.
(B) 2-a frame time slot SU1a
By using (corresponding to SD1a in FIG. 15B), only the useful low-frequency signal (0.3 to 1.65 kHz) from the telephone unit 101 is a time piece signal as in the case of the 1-a frame. It will be sent as L1.

In the next 2-b frame, the time slot SU1b of the 2-b frame of FIG. 13B (corresponding to SD1b of FIG. 15B) is used as in the case of the 1-b frame. Therefore, only a useful high frequency signal (1.65-3.0 kHz) is sent from the telephone unit 101 as the time piece signal H1.

FIG. 16 (b) shows a reception signal selector 171 for improving the effective utilization of frequency, and the switch S
Included are W11, SW12, a low pass filter LP11 and a high pass filter HP11. Here, the wireless base station 3
A signal from 0B to the mobile wireless device 100B is processed. For example, by using the time slots SD1a and SD1b (FIG. 13) assigned to the mobile radio device 100B, the time band signal L1 of the low frequency component and the time band signal H1 of the high frequency component of the transmitted telephone signal are generated. I am taking it out.

When mobile radio 100B receives time slot SD1a (FIG. 13) of 1-a frame,
6B, the switches SW11 and SW12 of the reception signal selector 171 are connected to the terminal a side by the control signal from the control unit 140, and the speed restoration circuit 138.
Of the input signal from the low frequency component (0.3
˜1.65 kHz), that is, only the signal of the time piece signal L1 (FIG. 14B) passes through the low-pass filter LP11 and is sent to the telephone unit 101. Here, the time piece signal L1
At the same time, the high frequency components (1.65 to 3.0 kHz) of the signal addressed to the other mobile radio included in the time piece signal H2 sent by the same time slot SD1a are:
This is low noise, so it is a low pass filter L.
It is suppressed by P11.

Next, the time slot S of the 1-b frame
When the mobile wireless device 100B receives D1b (FIG. 13),
In the time slot SD1b, as shown in FIG. 14 (b), a high-frequency time piece signal H addressed to the mobile wireless device 100B.
1 and the low-frequency time piece signal L2 addressed to another mobile radio device are included, the switches SW11 and SW12 are connected to the terminal b side by the control signal from the control unit 140 in FIG. 16 (b). , The signal included in the high-frequency time piece signal H1 (1.65 to 3.0 kHz) by the high-pass filter HP11.
Only z is passed, and the signal included in the low-frequency time piece signal L2 addressed to another mobile radio that is a noise component is suppressed.

The radio base station 30 receives the next 2-a frame.
Time slot SD1 from B to mobile radio 100B
When a is sent (FIG. 13), the switches SW11 and SW12 are connected to the terminal a side by the control signal from the control unit 140, and the same operation as in the case of the 1-a frame is performed, and the low range Only the frequency component (L1) is taken out without noise and sent to the telephone unit 101.

Further, when the time slot SD1b is sent from the radio base station 30B to the mobile radio 100B in the next 2-a frame (FIG. 13), the time slot SD1b is transmitted in the same manner as in the case of the 1-b frame. Signal H1 (Fig. 14 (b))
The high-frequency signal (1.65-3.0 kHz) included in is taken out without noise and sent to the telephone unit 101.

The above is the description of the operation performed by the reception signal selector 171 and the transmission signal selector 172 of the mobile radio device 100B for one telephone signal. Hello ISDN
The present invention is also useful in the case of having two telephone terminals such as a telephone terminal. This will be described with reference to FIGS. 17 (a) and 17 (b).

FIG. 17A corresponds to FIG. 16A, and has two telephone terminals, namely, telephone units 101-1 and 10-1.
Transmit signal selector 172 suitable for having 1-2
The detailed structure of B is shown. In the 1-a frame, the telephone signal from the telephone terminal 101-1 is the transmission signal selector 172B.
The switches SW23 and SW22 are connected to the terminal a side. As a result, the output from the telephone unit 101-1 is in the low frequency range (0.3 to 1.6) in the transmission signal selector 172B.
It is limited to only 5 kHz) and is sent to the speed conversion circuit 131. Then, the signal is transmitted from the antenna to the wireless base station 30B via the wireless transmission circuit 132. At the same time as this, the telephone unit 101-2 which is another telephone terminal
The output from (not shown in FIG. 11) is high frequency (1.65-3.0 kHz) in the transmission signal selector 172B.
It will be sent to the speed conversion circuit 131.

Next, in frame 1-b, the switches SW23 and SW22 of the transmission signal selector 172B are connected to the terminal b.
The telephone unit 101 is connected to the telephone
Telephone signals from -1 are in the high frequency range (1.65-3.0 kHz)
However, it is sent to the speed conversion circuit 131, respectively.

In the next 2-a frame, the same operation as that of the 1-a frame is performed, and thereafter, the same operation as that of the 1-b and 1-a frames is alternately repeated.

Next, from the radio base station 30B to the ISDN telephone terminal, two telephone units 101-are used as telephone terminals.
The operation of the reception signal selector 171B for the two frequency band limited telephone signals transmitted to the mobile wireless device 100B having the number 1 and 101-2 is the same as the frequency band limitation of FIG. It will be easily understood from the description of the operation of the reception signal selector 171 with respect to one telephone signal that is generated.

The operation of the reception signal selection circuit group 71 and the transmission signal selection circuit group 72 provided in the radio base station 30B will be described below with reference to FIG.

The incoming line (outgoing line) from the gateway exchange 20 of FIG. 1 is twice (2n) as compared with FIG. Hereinafter, it is assumed that the mobile wireless device 100B has two telephone units 101-1 and 101-2 as telephone terminals such as an ISDN telephone terminal. First, an input signal from the gateway switch 20 is converted from 2 lines to 4 lines by the signal processing unit 31, and then signals for each 2 lines of transmission are converted into transmission signal selection circuits 72-1 of the transmission signal selection circuit group 72. 72-2, ..., 72-n. The operation of the transmission signal selection circuit group 72 is
The transmission signal selector 172 of the mobile wireless device 100B (see FIG. 17).
The operation is similar to that of (a)) (detailed view of the transmission signal selection circuit group 72 is omitted). However, when the telephone units 101-1 and 101-2 of FIG. 17A have two telephone inputs (for example, in the case of the transmission signal selection circuit 72-1, the upper and lower two telephone inputs are used) and the speed conversion is performed. It is necessary to replace the circuit 131 with the signal speed conversion circuit group 51 and the like.

The transmission signal selection circuit 72-1 has a function of transmitting one of the upper and lower two telephone input signals to the signal speed conversion circuit 51-1 according to the control signal of the control section 40. That is, in FIG.
The time slot SD1a of the a frame is the radio base station 3
The signal is transmitted from 0B to the mobile wireless device 100B. With respect to this signal, the transmission signal selection circuit 72-1 turns on the signal in the low frequency range (0.3 to 1.65 kHz) for the upper signal of the two input signals according to the control signal of the control unit 40. Higher frequencies (1.65-3.0k) for lower signals
(Hz) signal is turned on, and the signal speed conversion circuit 5
After passing through 1-1, the signal allocation circuit 52-1 and the like, the signal is sent from the wireless transmission circuit 32 to the mobile wireless device 100B via the antenna. In the next 1-b frame, the transmission from the radio base station 30B to the mobile radio 100B is performed by the transmission signal selection circuit 72-1 by the control signal of the control unit 40 with respect to the upper signal of the two incoming signals. , High range (1.65-3.0kH
z) signal is turned on, and the lower signal is in the low range (0.3
A signal of up to 1.65 kHz) is turned on, passes through the signal speed conversion circuit 51-1 and the signal allocation circuit 52-1 and then is sent from the wireless transmission circuit 32 to the mobile wireless device 100B via the antenna. ..

In the next 2-a frame, again the previous 1-
The transmission state in the a frame is set. That is, the transmission signal selection circuit 72-1 turns on the low-frequency (0.3 to 1.65 kHz) signal for the upper signal of the two input signals,
High range (1.65 to 3.0 kHz) for lower signals
The signal of turns on. Hereinafter, the same operation as the 1-a and 1-b frames is alternately repeated.

Although the operation of the transmission signal selection circuit group 72 has been described above, the operation of the reception signal selection circuit group 71 of FIG. 12 will be described below. In this case, the reception signal selection circuit group 7
The operation of No. 1 is the reception signal selector 17 of the mobile wireless device 100B.
The operation is almost the same as that of 1B (FIG. 17B). (Detailed view of the reception signal selection circuit group 71 is omitted). However, in FIG.
The output to the telephone units 101-1 and 101-2 in (b) is 2
Individual telephone outputs (for example, the upper and lower two telephone outputs in the case of the reception signal selection circuit 71-1) and the speed restoration circuit 13
It is necessary to replace 8 with the signal speed restoration circuit 38 and the like.

The signal incoming to the radio base station 30B is as shown in FIG.
It becomes like 3 (b). In FIG. 13B, 1-a
The time slot SU1a of the frame is the mobile radio 10
The signal is transmitted from 0B to the wireless base station 30B.
This signal is transmitted to the wireless reception circuit 35, the signal selection circuit 39-1,
After passing through the signal speed restoration circuit 38-1 and undergoing the processing already described, it is inputted to the reception signal selection circuit 71-1. The operation of the reception signal selection circuit 71-1 is controlled by the control signal of the control unit 40 so that the output of this circuit is low for the signal of the upper output line of the two output lines to the signal processing unit 31. Signal in the range (0.3 to 1.65 kHz) is turned on, and for the signal on the lower outgoing line, the signal in the high range (1.65 to 3.0 kHz) is turned on and the reception signal is selected. Circuit group 7
Signal shaping circuit provided in 1 (circuit having the function of FIG. 15B described in the telephone section 101, but not shown)
After the signal is shaped by using the dummy signal and the communication quality is improved, the signal is input to the signal processing unit 31.

In the next 2-a frame, again the previous 1-a
It becomes the same as the transmission state in the frame. That is, for the signal of the output line on the upper side, the low frequency range (0.3 to 1,65 kHz)
The signal of z) is turned on, and for the signal of the lower outgoing line, the high frequency (1.65-3.0 kHz) signal is turned on. Hereinafter, the same operation as the 1-b and 1-a frames is alternately repeated.

By the system operation described above, the number of telephone lines usable in the system is doubled, and moreover,
Since the frequency bandwidth used is the same as that of the conventional system, it can be seen that the effective frequency utilization is doubled.

(4) Call Traffic Congestion Countermeasures The measures for improving the frequency effective utilization rate which have already been described in (3) are as follows.
Explain that it can be a countermeasure against traffic congestion. Less than,
This will be described with reference to FIG.

As described above, in the figure, among the frequency components of the telephone signal (frequency component 0.3 to 3.0 kHz),
It is presumed that the effective frequency utilization of the system will be twice as high as that of the conventional one, because the one having a frequency of 1.65 to 3.0 kHz is filtered by the low-pass filter and then the time piece signal L1 is created. It will get worse. The effective frequency utilization of frames in an actual system is as follows. The maximum frequency of the time piece signal L1 is the same as before even if the time compression is doubled as compared with the conventional case. Therefore, the time width of the time slot in which the time piece signal L1 should be accommodated is half that of the conventional case. Therefore, if the frame length is maintained at the conventional value and the time width of the guard time between time slots is set to 1/2 of the conventional value, the number of time slots that can be accommodated in one frame structure is doubled.

From the above, it has been clarified that if the time piece signal L1 in which the frequency component of the telephone signal is reduced to half is used, the frequency effective utilization rate is double that of the conventional one. Further, the multiple load gain also increases by 3 dB or more, and the transmission power can be reduced. First, in the case of the radio base station 30B, when the communication traffic of the system is normal in FIG. 12, the configuration of the reception signal selection circuit group 71 and the transmission signal selection circuit group 72 is the input / output circuit (upper input / output line of this circuit). It is as if it were directly connected by wire (not shown). Also, the signal speed restoration circuit group 3
The restoration speed of 8 is 1 / n times, and the conversion speed of the signal speed conversion circuit group 51 is n.

Now, the operation of the system when the call traffic in the system gradually increases will be described. First, in accordance with a control signal from the control unit 40, the signal selection circuit 39-1 of the signal selection circuit group 39, the signal speed restoration circuit 38-1 of the signal speed restoration circuit group 38, and the signal allocation circuit 52-1 of the signal allocation circuit group 52. The processing speed of the signal speed conversion circuit 51-1 of the signal speed conversion circuit group 51 is doubled. As a result, as long as the transmission / reception from the radio base station 30B to / from the mobile radio 100B is related to the reception signal selection circuit 71-1 of the reception signal selection circuit group 71 and the transmission signal selection circuit 72-1 of the transmission signal selection circuit group 72, the conventional 2 Signals flow in and out at twice the speed (2n). At this time, regarding the reception signal selection circuit 71-1 of the reception signal selection circuit group 71, 1.65-3.
After filtering the high-frequency signal of 0 kHz with a bandpass filter, the original telephone signal is ready to be taken out, and 2
Each of the input / output circuits is in the operating state.

Regarding the transmission signal selection circuit 72-1 of the transmission signal selection circuit group 72, the high frequency signal of 1.65 to 3.0 kHz among the frequency components of the telephone signal is filtered by the band pass filter. After that, the time piece signal L1 is generated, and the two input / output circuits of this circuit are also in the operation state.

The control unit 1 shown in FIG. 11 is instructed by the mobile radio 30B that communicates with the radio base station 30B.
In 40, the “halving of transmission / reception signals” of the reception signal selector 171 and the transmission signal selector 172 is executed,
It is possible to cope with the increase in call traffic of the system. If the call traffic further increases, the signal selection circuit 39 of the signal selection circuit group 39 of the radio base station 30B.
-2, the signal speed restoration circuit 38 of the signal speed restoration circuit group 38
-2, the signal allocating circuit 52-2 of the signal allocating circuit group 52, the processing speed of the signal speed converting circuit 51-2 of the signal speed converting circuit group 51 is also doubled, and the received signal selecting circuit 71 of the receiving signal selecting circuit group 71. As far as the -1, 71-2 and the reception signal selection circuits 72-1 and 72-2 of the transmission signal selection circuit group 72 are concerned, signals come in and go out at twice the speed (2n).

Due to the above measures, increase in call traffic is
Even if it doubles as compared with the case where the measures according to the present invention are not taken,
Communication within the system will be carried out smoothly, and a large measure of call traffic congestion will be possible.

[0125]

As is clear from the above description, the TCM
In the range where the communication quality in the communication system using signals is hardly deteriorated, the effective utilization of frequency is improved, and it is also extremely effective as a countermeasure against communication traffic congestion. Therefore, the effect of the present invention is extremely large.

[Brief description of drawings]

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

FIG. 2 is a circuit configuration diagram for explaining a basic operation of a mobile wireless device used in the system of the present invention.

FIG. 3 is a circuit configuration diagram for explaining a basic operation of a radio base station used in the system of the present invention.

FIG. 4 is a time slot structure diagram for explaining a basic operation used in the system of the present invention.

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

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

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

FIG. 8 is a spectrum diagram showing spectra of a call signal and a control signal.

FIG. 9 is a flow chart showing a basic operation flow of the system according to the present invention.

10 is a flow chart showing a flow of basic operation of the system according to the present invention together with FIG. 9.

FIG. 11 is a circuit configuration diagram of a specific example of a mobile wireless device used in the system of the present invention.

FIG. 12 is a circuit configuration diagram of a specific example of a radio base station used in the system of the present invention.

FIG. 13 is a time slot structure diagram for explaining a specific example of a time slot used in the system of the present invention.

FIG. 14 is a time slot contents diagram showing the contents of the embodiment of the time slot shown in FIG.

FIG. 15 is a time slot content diagram showing the contents of another embodiment of the time slot shown in FIG.

16 is a circuit diagram of an embodiment of a transmission signal selector and a reception signal selector for creating and restoring the time slots shown in FIGS. 14 and 15. FIG.

FIG. 17 is a circuit diagram of another embodiment of a transmission signal selector and a reception signal selector for creating and restoring the time slots shown in FIGS. 14 and 15.

[Explanation of symbols]

 10 telephone network 20 barrier exchange 22-1 to 22-2n communication signal 30 radio base station 31 signal processing unit 32 radio transmission circuit 35 radio reception circuit 38 signal speed restoration circuit group 38-1 to 38-n signal speed restoration circuit 39 signal Selection circuit group 39-1 to 39-n Signal selection circuit group 40 Control unit 41 Clock generator 42 Timing generation circuit 51 Signal speed conversion circuit group 51-1 to 51-n Signal speed conversion circuit 52 Signal allocation circuit group 52-1 -52-n signal allocation circuit 71 reception signal selection circuit group 71-1 to 71-n reception signal selection circuit 72 transmission signal selection circuit group 72-1 to 72-n transmission signal selection circuit 91 digital encoding circuit 92 multiplex conversion circuit 100, 100-1 to 100-n Mobile radio 101 Telephone section 120 Reference crystal oscillator 121-1 and 121-2 Synthesizer The 122-1 and 122-2 switches 123 transmission / reception gating controller 131 speed conversion circuit 132 wireless transmission circuit 133 transmission mixer 134 transmission unit 135 wireless reception circuit 136 reception mixer 137 reception unit 138 speed restoration circuit 141 clock regenerator 171 reception signal selection 172 Transmission signal selector H1, H2, L1, L2 Time piece signal HP1, HP2 High pass filter LP1, LP2 Low pass filter SW11-SW13, SW21-SW23 switch

Claims (2)

[Claims] 1. A radio base means (30), each of which covers a plurality of zones to form a service area, and a frame structure for moving across the plurality of zones and communicating with the radio base means. Mobile communication using barrier switching means (20) for exchanging communication with each mobile radio means (100) using radio channels carrying time-compressed delimited signals in time slots In the time division communication method, the frequency band of the signal of the first communication, which is one of the communication, is divided into a low frequency band and a high frequency band, and a time piece signal (L1, H
1) is created, and the frequency band of the signal of the second communication different from the first communication is divided into a low frequency band and a high frequency band, and a time piece signal (L2, H2)
In one of the time slots, a low-frequency time piece signal (L1) of the first communication and a high-frequency time piece signal (H2) of the second communication are placed, and In one of the time slots, a high frequency time segment signal (H1) of the first communication and a low frequency time segment signal (L2) of the second communication are placed. Time division communication method. 2. A radio base means (30) for covering a plurality of zones to form a service area, and a frame structure for moving across the plurality of zones and communicating with the radio base means. Mobile communication using barrier switching means (20) for exchanging communication with each mobile radio means (100) using radio channels carrying time-compressed delimited signals in time slots In the time division communication method, the frequency band of the signal of the first communication, which is one of the communication, is divided into a low frequency band, an intermediate frequency band, and a high frequency band to generate a time piece signal, The frequency band of the signal of the second communication, which is another one of the above, is divided into a low band, a middle band, and a high band to create a time piece signal. The frequency band of the signal of the communication of 3 is low range, middle range, and high range. A time segment signal is created by dividing the signal into three parts, and one is selected for each communication from among the three types of time segment signals of the low to mid band and high band of the first to third signals. A time division communication method for mobile communication, wherein the time band signals of the low band, the middle band, and the high band are selected and placed on one of the time slots.