JPH066291A - Time division communication method for mobile body communication - Google Patents

Abstract

PURPOSE:To provide the mobile body communication for riding a time difference telephone signal for taking a difference to a signal of a previous frame subjected to time compression on a time slot of a frame constitution. CONSTITUTION:This method uses each radio base station 30 for covering plural zones, and a barrier exchange 20 for exchanging a communication between the respective sets of mobile radio equipment 100 using a radio channel for riding a large value of a time difference telephone signal compressed and divided in time on a time slot of a frame constitution in order to communicate with the radio base station 30. Since signal power of a time difference telephone signal is remarkably small, and a large multiple load gain can be obtained, therefore, based thereon, the radio base station 30 and the mobile radio equipment 100 can determine a transmitting level, decrease of transmission power and effective utilizing of frequency are enabled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applicable to a system in which a signal having a band characteristic such as a telephone or a data signal is time-divided / time-compressed and then modulated to reduce the redundancy of a transmission signal. The present invention relates to a method for increasing the number of mobile terminals and effectively using frequencies. More specifically, a certain wireless channel is provided, and one of the many mobile wireless devices in the service area is used to set a wireless channel and communicate with the opposite wireless base station. Among, when the other mobile wireless device starts communication with another wireless base station using the same wireless channel, due to the effective use of frequency or radio wave propagation characteristics, respectively, with the mobile wireless device during communication, It is intended to provide a method for improving the effective utilization of frequency by gradually reducing the transmission output while eliminating the adverse influence on the communication with the radio base station, and an economical system using the method. Is.

[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 R
CS89-11 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 "Elucidation of multiple load gain of time division time compression multiple telephone signal and application to FM mobile communication" IEICE Technical Report RCS89-65 March 1990

Reference 4. Ito "Time division time compression multiplexing (T
CM) Multiple load gain of telephone signal ”IEICE Technical Report SST91-58 March 1992

Reference 5. Hayasaka "Introduction to Acoustic Engineering" Published by Nikkan Kogyo Shimbun, March 1978, pages 21-30

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, it is n times faster than the speed of storing it 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 radio receiving circuit having a receiving mixer which 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 Documents 3 and 4, the conventional FDM
The multiple load gain, which is known to be present in (frequency division multiplex) signals, is F even in the time division time compression multiplex (TCM) system.
It is clarified that there is a multiple load gain similar to the DM signal, and its quantification and system operation examples are explained. Then, by using this multiple load gain to deepen the modulation depth of FM, the transmission power can be significantly reduced, and it is expected that the mobile wireless device can achieve significant power saving. Has been reported.

Reference 5 describes in detail the nature of human voice.

FIGS. 15A to 15E show waveforms of vowel sounds a, d, a, o, and u of a voice. The first formant of vowel a in FIG.
z, the second formant is at 2400-3000 Hz. The first formant of vowel d in (b) is 350-55.
0 Hz, the second formant is 1500-2000 Hz,
The third formant is at 2500-3000 Hz, and similarly in the case of the vowel a of (c), 600-800 Hz,
1000-1400Hz, 2700-3100Hz,
In the case of the vowel sound (d), 420 to 500 Hz, 760 to
1000 Hz, 1300 to 2000 Hz, 300 to 480 Hz, 1000 to 1400 H in the case of vowel U of (e)
z, 2000-3000 Hz.

The frequency component that characterizes such a vowel is called a formant. On the other hand, the consonant appears in a transient manner only for a short time, its frequency component is relatively high, and its energy is extremely small. Figure 16 is "CHO"
In the sound waveform of (cho), the part where the amplitude is noticeable is CH
This is the part of the vowel O that follows, and the essential consonant is the fine waveform part that appears at the beginning.

The smallest pronunciational unit that constitutes a word is called a syllable. Most Japanese syllables take the form of (consonant c) + (vowel v), but in foreign languages the structure is complex and typical syllables are (consonant c) + (vowel v) + (consonant c) Such a configuration is adopted. The duration of the syllable is 100-
At 300 ms, the average is 1/8 second and the inter-syllable pause time is 100-200 ms.

Next, the relationship between the energy of voice and the amount of information will be described with reference to FIG. Even if the peak appearing in the waveform of the voice is compressed and removed, the amount of transmitted information does not change much. On the other hand, if the vicinity of 0 of the voice waveform is removed, the amount of information carried will drastically decrease even if a large amplitude area is left as it is. FIG. 17 shows the results of this experiment, in which the horizontal axis represents the amount of removal of the peak or zero portion of the speech waveform, and the vertical axis represents the reduction in word intelligibility caused by such removal.

FIG. 18 clearly shows the removal conditions when the experimental data of FIG. 17 is removed near zero and when the peak is removed. Here, the peak removal amount = 20 log (p ₁ / p ₀ ) (dB) 0 vicinity removal amount = 20 log (p ₂ / p ₀ ) (dB).

[0017]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the system construction example shown in (1), a general description of a mobile communication system using a TCM signal is given, and the system can be constructed by this, but the multiple load gain is not explained. In Documents 3 and 4, the multiple load gain relating to the signal power of the TCM signal is explained. However, when the time-compressed and delimited signal is a telephone signal, it is the change with time for each frame. The multiple load gain obtained by obtaining the difference signal and then using the temporally compressed delimited signal is not clarified.

Further, in Document 5, although the nature of the voice uttered by a person is described in detail, there is no description about a difference signal which is a temporal change in which a telephone signal is divided into time signals. There is an unsolved problem that a method for effectively utilizing the property is not disclosed.

[0019]

[Means for Solving the Problems] Telephone signal is converted to TCM-FM.
At the time of transmission, the telephone signal is compared with the previous frame signal for each frame, and the telephone signal extracted by the time change of the amplitude (hereinafter referred to as the time difference telephone signal) is not immediately transmitted. Comparing multiple difference signals,
There is a change in signal more than the amount specified by the system,
Only if the difference signal has a certain amount of power or more,
The separated signal was temporally compressed, and then the transmitted signal. As a result, the effective utilization of the frequency is improved, and it becomes possible to obtain a larger multiple load gain as the TCM signal than the value disclosed so far.

[0020]

15 and 16 show that when the majority of the duration of the telephone signal is divided into short time intervals (for example, 10 ms),
It shows that the same signal is repeated repeatedly. This indicates that when a telephone signal is divided into time signals and a time difference telephone signal which is a temporal change of the telephone signal is created, the signal component often has an extremely small number of components. When such a time-difference telephone signal is created, the signal component often has an extremely small number of components, so that it is possible to obtain a larger multiple load gain than ever before. In other words, in the TCM signal, it is possible to obtain a new gain, which is the load gain of the time difference telephone signal, in addition to the multiple load gain that has been clarified up to now. Can be obtained, and while keeping interference and interference within the allowable value,
By increasing the modulation degree of FM (PM) modulation, the transmission output can be gradually reduced. Therefore, the amplifier can be easily designed, the rated values of passive circuits such as mixers, resistors, and capacitors can be lowered, and an economical system can be constructed.

[0021]

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

In the following description, the case where the signal is in the analog format is dealt with, and the case where it is in the digital format will be described later.

In FIG. 1, reference numeral 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 switch 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 restoration circuit 138 restores the speed (pitch in the case of an analog signal) of the communication signal, which is a compressed and delimited time difference telephone signal (described in detail later) in the received signal, and outputs a continuous signal. Is input to the telephone unit 101 and the control unit 140.

In the communication signal output from the telephone unit 101, the speed conversion circuit 131 divides the communication signal at predetermined time intervals to obtain a time difference telephone signal and increase its speed (pitch in the case of an analog signal). It is (compressed) and applied to the wireless transmission circuit 132 including the transmission mixer 133 and the transmission unit 134.

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 timings 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. 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 time difference telephone signal is obtained by dividing the signal speed conversion circuit group 51 at predetermined time intervals. , Undergoes speed (pitch) conversion. As for the signal transmitted from the wireless base station 30 to the gateway switch 20, the output of the wireless reception circuit 35 is input to the signal speed restoration circuit group 38 via the signal selection circuit group 39, and speed (pitch) converted, The original telephone signal is restored from the time difference telephone signal and 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 restored by the signal speed restoration circuit group 38 including the signal speed restoration circuits 38-1 to 38-n provided for each channel to restore the signal speed (pitch) of the time difference telephone signal and restore the telephone signal. After that, after being input to the signal processing unit 31 and undergoing 4-line to 2-line conversion,
This output is the communication signals 22-1 to 22- to the gateway switch 20.
sent as n.

Next, the function of the signal speed conversion circuit group 51 (FIG. 3) will be described. By storing input signals such as voice signals and control signals, which are time-difference telephone signals divided into fixed time lengths, in a storage circuit, changing the speed at the time of reading this, and reading at a speed of, for example, 15 times that in the case of storing , It becomes possible to compress the time length of the signal. The principle of time compression of the signal speed conversion circuit group 51 is the same as the case of reproducing a voice recorded by a tape recorder at high speed. In practice, for example, a CCD (Charge Coupled Device) is used.
), BBD (Bucket Brigade Device) 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. "Conversation" Recorder that compresses / expands the time axis of "Nikkei Electronics, July 26, 1976 92-133
page).

CCD exemplified by the signal speed conversion circuit group 51
As described in the above-mentioned document, the circuit using BBD or BBD can be used as it is to realize the time extension function of the signal speed restoration circuit group 38. In this case, the clock and control from the clock generator 41 are performed. This can be realized by receiving a timing signal from a timing generator 42 that generates timing according to a control signal from the unit 40 and setting the reading speed to be slower than the writing 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 after speed (pitch) conversion and time difference signal processing are performed, It is applied to a signal allocation circuit group 52 which allocates a signal for each time slot. The signal allocation circuit group 52 is a buffer memory circuit, which stores the high-speed signals for one segment outputted from the signal speed conversion circuit group 51, and the timing information from the timing generation circuit 42 given by the instruction of the control unit 40. Then, the signal in the buffer memory is read and sent to the wireless transmission circuit 32. As a result, when the communication signals are viewed as channels, they are arranged in series without overlap in time series, and when all the 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 given time slots 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, as shown in the figure, a sync signal and a call signal which is a time difference telephone signal or / and a control signal are accommodated. 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 radio transmission circuit 32, the time slots SD1 to S
A signal forming one frame with Dn is added to the modulation circuit. The time-multiplexed multiplexed signal to be transmitted is
In the wireless transmission circuit 32, after being angle-modulated, it is 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

On the other hand, the signal sent from the mobile radio 100 is received by the antenna section of the radio base station 30 and input to the radio receiving circuit 35. FIG. 4B schematically shows 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. Further, when the contents of each time slot SU1, SU2, ..., SUn are shown in detail, as shown in the lower left of FIG. 4 (b), it is composed of a call signal which is a time difference telephone 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, the waveform of the radio carrier of the uplink radio signal in the time slot is schematically shown in FIG. 6 (c). Similarly, the transmission waveform from the wireless base station 30 to each mobile wireless device 100 is shown in FIG.
As shown in (d).

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

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

As shown in FIG. 3, the control signal from the control unit 40 is applied to the radio transmission circuit 32 in parallel with the output of the signal allocation circuit 52. However, 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 voice signal which is the time difference telephone signal is converted 15 times as described above, the frequency distribution of the signal is expanded to 4.5 kHz to 45 kHz as shown in FIG. 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. 7 shows the case where the control signal is simultaneously transmitted by using the lower frequency band of the voice signal which is the time difference telephone signal. Of these signals, control signal (0.2 to 4.0 kHz) and call 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 the mobile radio 100 This will be described with reference to the flow charts shown in FIGS. 8 and 9.

When the power of the mobile wireless device 100 is turned on, in the wireless receiving circuit 135 of FIG. 2, the wireless receiving circuit 135 is included in the downlink (wireless base station 30 → mobile wireless device 100) wireless channel (referred to as channel CH1). After capturing the control signal,
The radio channel (hereinafter referred to as channel CH1) is in the reception state. This is possible by capturing the sync signal in the time slot SDn shown in FIG. 4 (a). 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 the switch 122.
-1 is also in a state of being tilted down and fixed to the synthesizer 121-1 side.

Therefore, the telephone receiver of the telephone unit 101 is turned off.
When hooked (beginning of call) (S201, FIG. 8), 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.

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 control signal.
If the ID (identification number) of is detected (S202),
The control unit 40 searches for a currently empty time slot. As a result, for example, if the time slot SD1 is vacant, the time slot SDn of the radio channel CH1 is used for the mobile wireless device 100 by the downlink control signal (the mobile wireless device 100 →
The wireless base station 30) SU1 and the corresponding downlink (wireless base station 30 → mobile wireless device 100) SD1 are instructed to be used (S203).

In response to this, the mobile radio 100 shifts to the receivable state at the designated time slot SD1 and SU1 which is the time slot for the uplink radio channel corresponding to the downlink time slot SD1.
(See FIG. 4B). Mobile radio 1
In the control unit 140 of 00, the transmission / reception interrupt controller 12
3 to operate the switches 122-1 and 122-2 (S204). At the same time, a slot switching completion report is sent to the radio base station 30 using the upstream time slot SU1 (S205), and a dial tone is waited for (S206).

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 1, the SU3 and SUn are transmitted as an upstream signal from another mobile wireless device 100 in one frame. 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. 9).

This dial tone corresponds 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 unit 40 of the radio base station 30,
When the call end signal from the mobile wireless device 100 is received, the call end signal is transferred to the gateway switch 20 (S219), the switches 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 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 the mobile wireless device 100 It is assumed that the mobile wireless device 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, for example, SD1 of the downlink time slots of the radio channel CH1 addressed to the mobile wireless device 100, and the mobile wireless device 10 uses the empty slot.
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 call signal to the mobile radio device 100 of its own, the telephone section 101 sounds a ringing tone, and at the same time, 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.

It should be noted that the fact that signal transmission is executed in a good state using this system and that it does not adversely affect other wireless channels in the system is theoretically explained in Reference 2, and is therefore omitted. However, the increase of the multiple load gain of the time difference telephone signal will be described below.

(3) Multiple load gain of time difference telephone signal (3.1) Multiple load gain for analog telephone signal The multiple load gain in the system which does not use the time difference telephone signal is given by reference 3, but as in the present invention. , If an analog telephone signal is divided into time piece signals and a time difference telephone signal that is a differential signal is created from time piece signals that are temporally adjacent to each other, and a TCM signal is used in the system, a larger value than before is obtained. Multiple load gains with are obtained. It will be explained below that the utilization of this greatly contributes to the improvement of the effective use of the frequency of the system and the economical efficiency.

Now, referring to the reference 3, the T-multiple
The multiplex load gain (denoted by α dB) of the analog telephone signal (maximum frequency f _h ) converted into CM (frame length T) is given by the following equation. N ′ multiplex FDM (frequency division multiplex)
It is known to be the same as that of signals. n '= n / (2Tf _h )

Next, the features of the case where a TCM signal is created from an analog phone signal based on a time difference phone signal will be described. FIG. 10A is a diagram of FIG.
The signal "a" shown in FIG. 10A is shown, and FIG. 10B shows an example of the time difference telephone signal generated from the signal using the temporally adjacent time piece signals. That is, FIG.
The vowel "i" of 0 (a) (total time is about 220 ms) is 10
The signal is cut every ms to make a time piece signal.
The time difference telephone signals are created and arranged in a line.
However, it is assumed that the pulse noise generated at the time of shifting from one time piece signal to the next time piece signal is removed. Figure 1
5, FIG. 16 and FIG. 10 reveal the following.

1) The amplitude of the time difference telephone signal becomes large only when the short-time amplitude width change of the original telephone signal is large, and the amplitude is extremely small at other times.

2) Since the time length of the time piece signal is about 1 to 30 ms, the time length is suitable for catching a minute change in the audio signal. As is clear from FIG. 15 and FIG. 16, except for a part of temporally adjacent time piece signals, the signal waveforms thereof are almost the same.

3) Therefore, the following can be generally said as the characteristics of the time difference telephone signal generated by using the time piece signals which are temporally adjacent to each other. First, 50% or more is almost no signal, that is, an empty signal containing no component. Most of the remaining 50% or less have a small signal power except some.

4) The empty signal has no power, and the power in one frame of the TCM signal obtained by time-compressing the time piece signal containing only a small signal power is as follows. That is, in a frame containing many of these signals, 1
TC which did not create a time difference telephone signal when measuring the average power of each part of the frame every / (2Tf _h ) time
The average power measured every 1 / (2Tf _h ) time of the M signal is greatly reduced. This value is estimated to be about 1/10 or less.

Further, in the present invention, even if a time difference telephone signal is created, not all of them are transmitted (although all time difference telephone signals are transmitted, there is a considerable effect, but by the method explained below, More effective). That is, the electric powers of these plural time difference telephone signals were measured, and only those having an amount equal to or more than the amount determined by the system were set as temporally compressed separated signals, and then set as transmission signals. As a result, the redundancy included in the transmission signal is significantly reduced, the effective utilization of frequency is improved, and the multiple load gain is significantly increased.

If the time-difference telephone signal of a quantity less than the amount determined by the system is an empty signal, it is possible not to transmit any signal including the wireless carrier wave.

Next, the multiple load gain of the TCM signal composed of the time difference telephone signal used as the transmission signal by the above method will be obtained. The multiple load gain occurs due to the following two reasons.

Multiple load gain with reduced power of staggered telephone signals

Multiple load gain due to not transmitting low level time difference telephone signals

, Results in the problem of finding the distribution of the power of the time difference telephone signal.

To be precise, it is necessary to create a time difference telephone signal similar to that shown in FIG. 10 (b) for many voice signals based on FIGS. 15 and 16 and obtain the distribution thereof or to conduct an experiment. Yes, but I will omit it here and make an estimation. If 20% of the staggered telephone signals exceed the amount defined by the system (15% in this case), the average power of these staggered telephone signals is expected to be 25%, which would be the safe side. As a result, as a whole, it is 1/2 of the TCM signal when the time difference telephone signal is not created.
It is estimated (actually smaller) that the power will be 0 or less.

Next, a method of creating the time difference telephone signal described above and a method of transmitting only the time difference telephone signal having a constant power will be described with reference to FIG. FIG. 11 is a block diagram of the speed restoration circuit 13 in the configuration of the mobile wireless device 100 shown in FIG.
8 shows the internal configurations of the telephone unit 101 and the speed conversion circuit 131, respectively.

In FIG. 11, the radio receiving circuit 1 is shown from the right side.
The compressed time difference telephone signal (difference signal) from 35 is input. This input signal is timed by switch 165.
It is input to and stored in the telephone signal storage circuit 161-1 or 161-2 for each slot (one for each TCM frame). The terminals a and b of the switch 165 are
The timing of the switching of is switched by a signal from the timing generator 142. The signal stored here is then read and restored to the original telephone signal rate by the time expansion circuit 162-1 or 162-2. Then, this restored telephone signal is still in the form of a time difference telephone signal, and by switching the terminals a and b of the switch 166-1 or 166-2 (this timing also depends on the signal from the timing generator 142). It is input to the reproduction circuit 163-1 or 163-2. Here, the time-difference telephone signal (difference signal) is added to the signal in the time slot of the frame immediately before that, and the original telephone signal for one frame is reproduced. Then, by switching the terminals a and b of the switch 167 (this timing also depends on the signal from the timing generator 142), the output of the telephone signal reproducing circuit 163-1 or 163-2 is alternately taken out, and the telephone unit 10
1 to the receiving circuit 106.

The left side of FIG. 11 shows the internal structure of the telephone section 101, which includes a control section 140 and a telephone control circuit 105.
Control signals are exchanged between the two. Also, the receiving circuit 1
06 and the transmission circuit 107 operate by receiving a signal from the clock regenerator 141.

The internal structure of the speed conversion circuit 131 is shown in the lower part of FIG. 11, and the telephone signal output from the transmission circuit 107 of the telephone unit 101 is stored in the telephone signal by the switch 175 for each frame of the telephone signal. It is input to the circuit 171-1 or 171-2 and stored therein. The timing of switching the terminals a and b of the switch 175 is performed by a signal from the timing generator 142. The signal stored here is read out and the difference signal generating circuit 172-1 or 172-2 is generated by switching the terminals a and b of the switch 176-1 or 176-2 (this timing also depends on the signal from the timing generator 142). The telephone signal is converted into a time difference telephone signal which is subtracted (differential) from the telephone signal of the immediately preceding frame. Then, a part of the converted time difference telephone signal is input to the time compression circuit 173-1 or 173-2, and another part is input to the signal level measuring device 181. Whether or not a part of the time difference telephone signal is actually applied to the time compression circuits 173-1 and 173-2 requires that the level of the time difference telephone signal is equal to or higher than a certain level, and this is determined. Is a signal level measuring device 181. The signal level measuring device 181 measures the level of the time difference telephone signal, and when it recognizes that it is above a certain level, the switch control section 18
The control signal is sent to No. 3, and the switch 178-1 is controlled so as to fall to the a side, and the switch 178-2 is controlled so as to fall to the b side. Further, the signal level measuring device 181 is the level information generator 182.
To the control unit 140 and the time compression circuits 173-1 and 173 from the level information generator 182.
-2. Upon receiving this information, the control unit 140 can control the wireless transmission circuit 132 to stop the transmission of the wireless signal including the wireless carrier wave. On the other hand, the signals sent to the time compression circuits 173-1 and 173-2 include a signal notifying the receiving side that the level of the time difference telephone signal is below a certain level. However, when using this signal, it is necessary to continue the transmission of the wireless signal using the wireless carrier wave.

Now, the time compression circuits 173-1 and 173-
The time difference telephone signal applied to No. 2 switches the terminals a and b of the switch 177 (this timing also applies to the timing generator 14).
2)) for each time slot of the TCM signal (one for each TCM frame unit)
To the wireless transmission circuit 132.

In the radio transmission circuit 132 (FIG. 2), the signal is frequency-modulated at the signal level in consideration of the multiple load gain and then sent to the transmission mixer 133. The TCM-converted telephone signal frequency-modulated by the transmission mixer 133 becomes one modulated signal wave having a designated carrier frequency, and is transmitted from the antenna to the radio base station 30.

Next, the operation of the radio base station 30 will be described. Among the configurations of the radio base station 30 shown in FIG. 3, the internal configurations of the signal speed restoration circuit group 38 and the signal speed conversion circuit group 51 are different from each other except that signals are transmitted and received simultaneously with a large number of mobile wireless devices. For example, it has substantially the same functions as the speed restoration circuit 138 and the speed conversion circuit 131 of the mobile wireless device 100.

As is clear from the above description, the method for creating the time difference telephone signal is easy, and if it is introduced into an actual system, it is possible to obtain a multiple load gain of about 20 dB or more. It can be used to reduce transmission power.

(3.2) Multiplex Load Gain for Digital Signal The increase in multiplex load gain due to the time difference telephone signal already explained in (3.1) is applied not only to an analog telephone signal but also to a digital signal in general. It is possible and described below.

In FIG. 1, communication signals 22-1 to 22 that flow on the transmission line between the gateway switch 20 and the radio base station 30.
-N and the output signal or input signal from the telephone unit 101 in FIG. 2 are in the digital signal format, the signal processing in the circuits shown in FIGS.
Only points different from analog signals will be described below.

If the communication signal output from the telephone unit 101 is a digital signal, the digital signal format is input to the speed conversion circuit 131. Telephone signal storage circuits 171-1, 171-2 and difference signal creation circuit 172 of FIG.
-172-2-2, signal level measuring device 181, level information generator 182, time compression circuit 173-1, 173-2
Etc., the signal processing can be performed by making the best use of the characteristics of the digital signal format. The signal level measuring device 181 may measure the power level in an analog manner like an analog telephone signal, but if the number of pulses of a digital signal is measured and this number exceeds a certain number, the switch 178 -1 (or 178-2) may be tilted to the a side (or b side).

Next, control signals for system control operation will be described. In this case, since it is considered that the control signal also adopts the digital signal format, the band of FIG. 7 showing the spectrum of the analog telephone signal cannot be used. Figure 1
2 shows a circuit for multiplexing a digital telephone signal and a digital control signal. The audio signal is digitally encoded by the digital encoding circuit 91, and the control signal, which is a data signal, is subjected to multiplex conversion by the multiplex conversion circuit 92 and applied to the modulation circuit included in the wireless transmission circuit 32. Then, by receiving the signals with the receivers opposite to each other and performing the operation opposite to that shown in FIG. 12 in the demodulation circuit, it is possible to separately extract the audio signal and the control signal.

(4) Peak Suppression Effect of Time Difference Signal by Syrabic Compressor As described in (3), the time difference telephone signal has its power level (to be precise, a large number of time difference telephone signals are selected and Since the levels are averaged) are generally low, this has substantially increased the signal's multiple load gain. However, it is generally true that the time difference telephone signal has a low power level, and the power level or peak value of a particular time difference telephone signal is the maximum of the original time piece signal that creates the time difference telephone signal. It has almost the same value as the power level. Also, the maximum value of the peak voltage value of the time difference telephone signal is
It has almost the same value as the maximum value of the original time piece signal. However, it is assumed that the phases of the main waves (formants) of the signals included in the time piece signals that are adjacent to each other are adjusted to be the same phase.

Therefore, as described in (3), the level of the signal is increased to a value determined by the difference between the reduced level of the time difference telephone signal and the power level of the original signal, and then the amplitude modulator. Or, when it is added to the angle modulator, there is no particular problem with a normal time difference telephone signal, but with a specific time difference telephone signal, the power level or peak voltage value that it has is large, so it adversely affects other radio channels such as radio interference. there is a possibility.

The above problem can be eliminated by a silavic compressor (compressor), which is inserted before the amplitude modulator or the angle modulator of the radio transmitter to which the time difference telephone signal is applied. This makes it possible to achieve the purpose.

The operation of the Syrabic compressor will be described below. It is widely used in mobile communication transmitters. On the other hand, the receiver uses a Syrabic expander as a circuit that makes a pair with the compressor, and both are called a Syrabic compander.

Syrabic compander is a general term for a combination of a compressor (compressor) and an expander (expander). What is used in analog voice communication is one that operates according to the envelope level of voice, and is currently widely used. Used (Hereinafter, the word syracic is omitted).

In the present invention, a compander similar to the one described above is used for compression and decompression of signals in the vicinity of the peak value of the TCM signal and its level to improve the amplitude characteristic. The specific system configuration and operation will be described below.

FIG. 13 shows an embodiment in which a compander is applied to the mobile radio device 100. The difference from the speed conversion circuit 131 shown in FIG. 11 is that the compressor 17 in FIG.
4-1 and 174-2 are switches 178-1 and 178-2.
It is inserted between the difference signal generation circuits 172-1 and 172-2 and the time compression circuits 173-1 and 173-2 via the, and the amplitude of the time difference telephone signal is compressed here. An example of the compression characteristic received at this time is shown in FIG.

Since the compressor characteristic of FIG. 14 gives an output of n ^1/2 with respect to the input signal n, it is called 1/2 compression. That is, when the input level changes by 10 dB, the output level changes by 5 dB. Therefore, the distribution of the amplitude characteristic of the audio signal is 1/2 in decibels. Therefore, when coming into the wireless transmission circuit 132, the signal distribution is 1/2 in decibel as compared with the case where the compression is not performed by the compressors 174-1 and 174-2.

Now, assume that the amplitude-compressed signal is transmitted from the radio base station 30 from the antenna and received by the mobile radio 100. 13 is different from the configuration of the speed restoration circuit 138 shown in FIG. 11 in the configuration of the mobile wireless device 100.
As described above, the time-compressed time difference telephone signal of the received signal passes through the telephone signal storage circuits 161-1 and 161-2 via the switch 165 as described above, and then expander 164-1. 164-2 is input. This input signal undergoes conversion according to the expander characteristic of FIG. That is, the input level is 5 dB
When it changes, the output level changes by 10 dB. As a result, as shown in the center of FIG. 14, the overall characteristic is that the voice input change on the transmitting side is 1 dB, and the input change to the telephone section 101 on the receiving side is also 1 dB, so that the original signal is faithfully reproduced. The outputs of the expanders 164-1 and 164-2 are the time expansion circuits 162-1 and 162-2 and the switch 1 respectively.
Telephone signal reproduction circuit 163 via 66-1 and 166-2
-1,163-2.

In the above description, the case where the wireless base station 30 transmits and the mobile wireless device 100 receives is explained, but the same applies when the mobile wireless device 100 transmits and the wireless base station 30 receives. That is, also in the radio base station 30, a compander similar to that included in the mobile radio device 100 shown in FIG. 13 is installed at a position corresponding to the insertion position in the mobile radio device 100.

By applying the compander described above, it is possible to eliminate or reduce the possibility that the amplitude of a time difference telephone signal having a large signal level is compressed and adversely affects other radio channels such as radio interference.

As described with reference to FIGS. 17 and 18, it is also known that even if the peak level signal component of the telephone signal is removed, the effect on the intelligibility of the signal is considerably small. Therefore, the compression degree of the compander is large, and its characteristics change over time,
Even if the reproduction of the peak-level signal component becomes unsatisfactory, the influence on the signal is considerably reduced. This is advantageous in increasing the substantial multiple load gain due to the use of companders. That is, it is estimated that an increase in multiple load gain of 10 dB or more can be expected with 1/2 compression, and 15 dB or more can be expected with 1/4 compression, and it is more advantageous to increase the compression degree.

(5) Peak suppression effect of time difference telephone signal by band-pass filter In (4), the peak suppression effect of time difference telephone signal by compander was explained, but the target of peak suppression is analog telephone signal, It has no effect on the signal. Therefore, as will be described below, it will be described below that the peak suppression effect can be exerted regardless of the digital / analog signal even by a bandpass filter (not shown) inserted in the radio output stage. As an example, a T signal in which an analog telephone signal converted into a time difference telephone signal is multiplexed 10
Take a CM signal. In this case, the frequency band of the signal is 3 kHz to 30 kHz (the frequency band of the time difference telephone signal is the same). Further, it is assumed that carrier frequencies of 10 waves are arranged at intervals of 125 kHz.

This TCM signal is FM, and its modulation deviation amount is 1.75 × 5 = 8.75 rad. (Rms, 10kH
z sine wave). In the above equation, x5 is used because the power reduction of the signal due to the conversion into the time difference telephone signal is utilized for increasing the modulation shift amount. As a result, in the high-level time difference telephone signal as described above, the frequency shift of the FM modulated signal becomes extremely large. In concrete terms,
Of the effective signal components included in the sidebands of the modulated wave, the approximate maximum frequency f _p is f _p = 30 + 100 = 130 (kHz). Therefore, it may cause adverse effects such as radio interference on adjacent radio channels. Become. To prevent this, a band pass filter may be inserted in the output stage of the wireless modulated wave. The required pass band width B of the band pass filter would then be B = ± 50 kHz.

As a result of inserting the band pass filter, the peak signal component of the time difference telephone signal is suppressed. However, as described above, even if the peak level signal component of the telephone signal is removed,
Since the influence on the intelligibility of the signal is small, there is no problem.

Incidentally, one analog telephone signal is carried on one carrier frequency in use, that is, so-called SCPC (Sing
In the le Channel Per Carrier (IDC) method, an IDC (Instanteneous Deviation Control) is inserted before the FM of the signal. This is because when the signal input to the modulator has an excessive level, the level is suppressed to prevent adverse effects such as radio interference on adjacent radio channels. However, since the application of IDC causes distortion noise in the signal, a method of reducing the power level of the signal by creating a time difference telephone signal, such as the method of the present invention, is desirable. Then a compander or bandpass filter should be applied. Of course, these applications also cause distortion noise in the signal, but since the occurrence probabilities of the peak level of the signal are greatly different, the influence on the signal is reduced, and the superiority of the present invention becomes clear.
Of course, the application of IDC is also possible in the present invention.

The above is the case of an analog telephone signal, but the case of a digital signal will be described. In this case, even if the shift amount of the modulation is large compared to the analog telephone signal, the distortion (error rate in this case) exerted on the own signal is not so large. The reason is as follows.

When the deviation amount of the modulation of the digital signal is large, it is less likely to be adversely affected by the radio interference from the adjacent radio channel. Conversely, adverse effects such as radio interference from the own radio channel are reduced.

By creating the time difference digital signal,
The number of pulses existing in the signal is relatively small, and even if the deviation amount of the modulation of the signal is large, the probability of adverse effects such as radio interference on adjacent radio channels is reduced.

In the above description, a telephone signal is used as an example for both analog and digital signals. However, the signal is not necessarily limited to a telephone signal, and a general analog or digital signal may be used. If there is redundancy, the redundancy is reduced by creating the time difference signal, and the same effect as above can be expected. Further, it is apparent that the efficiency of signal transmission is further improved by selecting and transmitting only the signal having a large signal component among the time difference signals.

(6) Measures against error signal In addition to creating the time difference telephone signal as described above,
Furthermore, if only a signal having a large signal component is selected and transmitted from the time difference signals, the signal receiving side cannot completely restore the transmitted signal, but it can be used within a range that does not cause any practical problems. However, among the time difference telephone signals,
If you select only signals with large signal components and continue to transmit,
Error signals may accumulate on the signal receiving side. There are the following measures against this.

Since it is estimated that the amount of error signal does not become so large in about 10 to 20 frames, it is not necessary to perform this removal frequently. Therefore, it suffices to perform removal once every 30 to 100 frames.

The error signal is integrated, and this is
It is added to the signal to be transmitted once every 100 frames and then transmitted.

For every 10 to 50 frames, not the time difference telephone signal but the original telephone signal (the time piece signal itself)
Is transmitted, and thereafter, the purpose is achieved by taking a method such as transmitting a predetermined time difference telephone signal.

[0120]

As is apparent from the above description, in the TCM system using the analog or digital signal, by using the time difference telephone signal described in detail in the present text, the multiple load gain of the TCM signal is inherently possessed by the TCM signal. It is possible to make the value larger than the value of, and further, if all the time difference telephone signals are not transmitted as signals to be actually transmitted and only the time difference telephone signals having a constant power are limited, a larger multiple load gain can be obtained. It has become possible to obtain. In addition, we have clarified a concrete method to suppress the component of the time difference telephone signal at the peak level, and it is also possible to avoid adverse effects such as radio interference on adjacent radio channels, so that many terminals can be accommodated. 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 waveform diagram showing a radio signal waveform of a time slot.

FIG. 7 is a spectrum diagram showing spectra of a call signal and a control signal.

FIG. 8 is a flow chart showing a flow of basic operation of the system according to the present invention.

9 is a flow chart showing a flow of basic operation of the system according to the present invention together with FIG. 8.

10 is a waveform diagram showing a time difference signal waveform (b) used in the present invention obtained from the signal waveform (a) of FIG.

11 is a circuit configuration diagram showing an operation principle of a speed restoration circuit, a telephone unit, and a speed conversion circuit which are the constituent elements of FIG.

FIG. 12 is a circuit configuration diagram for multiplexing a voice signal and a data signal.

13 is a circuit configuration diagram of a speed restoration circuit, a telephone unit and a speed conversion circuit in which a compressor and an expander are added to the circuit of FIG.

FIG. 14 is a characteristic diagram showing input / output characteristics of a compressor and an expander.

FIG. 15 is a waveform diagram of a vowel.

FIG. 16 is a waveform diagram of consonant + vowel (cho).

FIG. 17 is a characteristic diagram showing information transmission amount characteristics when peaks are removed from a telephone signal and when the vicinity of 0 is removed.

FIG. 18 is a waveform diagram showing waveforms when removing peaks and when removing near zero in FIG.

[Explanation of symbols]

10 telephone network 20 barrier exchange 22-1 to 22-n communication signal 30 radio base station 31 signal processing unit 32 radio transmission circuit 35 radio reception circuit 38 signal speed restoration circuit group 38-1 to 38-n signal speed restoration circuit 39 signal Selection circuit group 39-1 to 39-n Signal selection circuit group 40 Control unit 41 Clock generator 42 Timing generation circuit 51 Signal speed conversion circuit group 51-1 to 51-n Signal speed conversion circuit 52 Signal allocation circuit group 52-1 ˜52-n signal allocation circuit 91 digital encoding circuit 92 multiplex conversion circuit 100, 100-1 to 100-n mobile radio device 101 telephone unit 120 reference crystal oscillator 121-1, 121-2 synthesizer 122-1, 122-2 Switch 123 Transmission / reception gating controller 131 Speed conversion circuit 132 Wireless transmission circuit 133 Transmission mixer 134 Transmission unit 135 Radio reception circuit 136 Reception mixer 137 Reception unit 138 Speed restoration circuit 141 Clock regenerator 161-1, 161-2 Telephone signal storage circuit 162-1, 162-2 Time expansion circuit 163-1, 163-2 Telephone signal Reproduction circuit 164-1, 164-2 Expander 165, 166-1, 166-2, 167 Switch 171-1, 171-2 Telephone signal storage circuit 172-1, 172-2 Difference signal creation circuit 173-1, 173 -2 time compression circuit 174-1, 174-2 compressor 175, 176-1, 176-2, 177, 178-
1,178-2 Switch 181 Signal level measuring device 182 Level information generator 183 Switch control unit

Claims (1)

[Claims] 1. A radio base means (30) each of which covers a plurality of zones to form a service area, and a frame structure for moving across the plurality of zones and communicating with the radio base means. Mobile communications using barrier exchange means (20) for exchanging communications with each mobile radio means (100) using radio channels carrying time-compressed delimited signals in time slots. In the time division communication method, the difference signal, which is a temporal change amount, is obtained for each frame of the temporally compressed segmented signal, and the difference signal whose level exceeds a predetermined value is temporally compressed. Mobile communication means for determining the level of a radio signal used for communication between the radio base means and the mobile radio means based on the multiple load gain obtained by setting the divided signal as Time division communication method.