JPH04322522A - Time division communication method for mobile radio communication - Google Patents

Abstract

PURPOSE:To utilize a frequency effectively by allocating a telephone signal continuously to a composite signal in the unit of time slots and sending the result as a single signal in the case of communication with plural communication signals (composite signals). CONSTITUTION:The output of a modulator of a transmission section 134 is converted into a signal with a prescribed frequency by a transmission mixer 133 and received by a radio base station. In order to send a signal by using a time slot permitted by a mobile radio equipment 100, a timing generator 142 gives a required timing to a transmission reception interrupt controller 123, a speed conversion circuit 131 and a speed restoration circuit 138 based on a clock signal from a clock recovery device 141 and a control signal from a control section 140. The controller 123 and the generator 142 selecting synthesizers 121-1, 121-2 and changeover switches 122-1, 122-2 in the radio equipment 100 are controlled by the control section 140. Thus, the frequency is effectively utilized and the system is easily and economically operated.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio base station for time-division communication of a radio communication channel in mobile communication and a mobile radio. More specifically, given a radio channel among many radio channels given to the system, one of the many mobile radios in the service area can use it to communicate with the opposing radio base station. When another mobile radio device requests to communicate using the same radio channel while setting up a wireless line and communicating using communication signals, the mobile radio device and the radio base station that are already communicating An independent radio link can be established using the same radio channel between other mobile radios and the radio base station without adversely affecting the communication between the radio base station and the composite signal including telephone, data, and image signals. The present invention relates to a time-division communication system using the same radio channel that enables communication between users.

0002

2. Description of the Related Art A system employing time division time compression multiplexed signals in mobile communication using voice using a small zone system is described in the following literature.

[0003] Literature 1. Ito “Studying mobile phone systems-
Proposal of time-division time compression FM modulation method -” IEICE technical report
RCS89-11 July 1989

[0004] Literature 2. Ito “Studying mobile phone systems-
Study of multiple wave propagation characteristics of time division time compression multiplexing FM system -
“IEICE Technical Report RCS89-47 January 1990

00
05] Literature 3. Ito “Elucidation of the multiple load gain of time division time compression multiplexed telephone signals and its application to FM mobile communications”
IEICE Technical Report RCS89-65 March 1990

0
[006] In other words, in Document 1, a transmission signal (baseband signal) is divided into predetermined time intervals and stored in a memory circuit, and when read out, the signal is read out at a predetermined speed n times faster than the speed at which it is stored in the memory circuit. The time of
read out at a time slot and angle or amplitude modulate the carrier wave with the signal accommodated by this time slot;
A radio receiving circuit having a receiving mixer that communicates with each other, a radio transmitting circuit having a transmitting mixer, and a radio receiving circuit, which are built into a mobile radio device and a radio base station for temporally intermittent transmission and reception. A switch circuit is provided for the synthesizer that applies the voltage to the receiving mixer of the radio transmitter circuit and the synthesizer that applies the voltage to the transmitting mixer of the wireless transmitting circuit, and the output of the synthesizer applied to each is intermittent, and this intermittent state is synchronized with the transmission and reception, and the communication is performed oppositely. The same method of synchronizing intermittent transmission and reception with that of mobile radio equipment is used for the radio base station that uses the mobile radio, and the radio receiving circuit is installed on the receiving side in order to extract only the signals accommodated in the predetermined time slot. The signal obtained by opening and closing, receiving, and demodulating is stored in a memory circuit, and when read out, it is read out at a low speed of 1/n of the speed at which it is stored in this memory circuit, so that the original signal that was transmitted can be used. An example of a system in which a system that can reproduce a certain baseband signal is constructed has been reported.

[0007] Furthermore, in Document 2, the influence of multipath fading that TCM signals receive while transmitting in space is studied, and as a measure to eliminate or reduce this influence, a guard time is set between time slots. I am proposing to do so.

[0008] Furthermore, in Document 3, the multiple load gain, which was known to exist in conventional FDM (frequency division multiplexing) signals, has been found to exist in the time division time compression multiplexing (TCM) system as well. It clarifies the above, and explains its quantification and system operation examples. By using this multiload gain to increase the depth of FM modulation, it is possible to significantly reduce the transmission power, and we have obtained the prospect that it will be possible to significantly reduce power consumption in mobile radio equipment. has been reported.

However, in the ISDN era, there is no explanation in any of the literature about the case where a wireless base station and a mobile wireless device facing each other set up a wireless line and send and receive composite signals using a plurality of communication signals. .

0010

[Problems to be Solved by the Invention] For example, when a wireless base station and a mobile wireless device facing each other set up a wireless line and communicate using multiple communication signals such as telephone and fax, the conventional method uses the same frame. The two time slots within are used. Then, in order to set up a communication path, the telephone and fax signals would be processed as separate communication signals, so it would be as if the operation was necessary to set up a communication path for two independent mobile radio devices. . In addition, a guard time is provided between adjacent time slots to avoid the negative effects of radio wave propagation, and this leaves an issue to be resolved in that the frequency cannot be used effectively. Ta.

[0011]

[Means for solving the problem] When a radio base station and a mobile radio device facing each other set up a radio line and communicate using multiple communication signals such as telephone and fax (hereinafter abbreviated as composite signal), A time slot assigned to one signal is assigned as a unit, and multiple time slots that are adjacent to each other are assigned to a composite signal continuously without guard time, which is then transmitted to each other as a single signal. It was to be.

0012

[Operation] A wireless base station and a large number of mobile wireless devices exist within its service area, and in order for any number of mobile wireless devices to be able to communicate with the wireless base station, one wireless channel is Selecting a time slot for composite communication that is divided into a plurality of time slot series and in which one or a plurality of these time slot series are combined into one time slot by eliminating the guard time, A system that can communicate using this was constructed. When a mobile radio device desiring composite communication requests communication with a radio base station, the new mobile radio device requesting communication is given a time slot sequence on the radio channel already in use. By eliminating the guard time and giving one unused time slot or a plurality of adjacent time slots as a time slot for composite communication to enable communication with the wireless base station, a large number of It has become possible to carry out communications without interfering with each other's communications and without adversely affecting one's own communications.

[0013]

[Example] The system to which the invention is applied is ISDN (Integrate), which is expected to be introduced worldwide in the future.
dService of Digital Network
Ork comprehensive service digital network). IS
Communication terminals for the DN system include not only telephones but also non-telephone terminals such as facsimile, image, and data terminals. Although the signal format used in ISDN systems is digital, analog signal formats are effective for systems to which the present invention is applied. It is an analog telephone signal (frequency band 0.3-3.0
kHz), multiple load gain can be obtained. Therefore, when a digital telephone signal (64 kbit/sec) is input to this system, it is effective to perform digital-to-analog (D-A) conversion. It is also effective to perform signal conversion on digital signals other than telephone signals to compress the frequency band. This is because analog format signals have higher frequency efficiency than digital format signals. However, there is no problem in using the digital signal format as is in this system. Note that if a signal that has undergone digital-to-analog (D-A) conversion at the input section of this system is output to another network, the reverse conversion to the above, that is, the analog-to-digital (A-D) conversion must be performed. If this is done, the interface will match the general ISDN network.

As explained above, the signals to which the present invention is applied are wide-ranging, such as telephone calls, images, and data, but a single analog telephone signal is sufficient to explain the principle.
This case will be explained below.

FIGS. 1, 2, and 3 show a system configuration for explaining an embodiment of the present invention.

In FIG. 1, 10 is a general telephone network, and 20 is a gateway exchange for connecting the telephone network 10 and a wireless system. 30 is a wireless base station, which includes an interface with the gateway exchange 20, a circuit for converting signal speeds, a circuit for allocating and selecting time slots, a control unit, etc., and is responsible for setting and canceling wireless lines. , has a wireless transmitting/receiving circuit for exchanging wireless signals with the mobile wireless devices 100 (100-1 to 100-n). Here, between the barrier switch 20 and the radio base station 30, there is a transmission line that transmits communication signals 22-1 to 22-n including communication signals of communication channels CH1 to CHn and control signals.

FIG. 2 shows a circuit configuration of a mobile radio device 100 that communicates with a radio base station 30. Received signals such as control signals and call signals received by the antenna section are sent to the wireless receiving circuit 13 including a receiving mixer 136 and a receiving section 137.
5, and the output communication signal is sent to 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 recovery circuit 138, the control section 140, and the timing generator 142.

The speed restoration circuit 138 restores the speed (pitch in the case of an analog signal) of the compressed and segmented communication signal in the received signal and inputs it as a continuous signal to the terminal section 102 and the control section 140. are doing.

FIG. 3 shows details of the terminal section 102, which is composed of various terminals. Figure (a) is 2
NTT's INS64, which is the ISDN for public telephone lines in Japan, consists of two telephones T1 and T2.
In terms of service, this corresponds to using two telephone lines (64+64kb/sec) out of 64+64+16kb/sec.

FIG. 3(b) shows telephone T (64 kb/sec
), facsimile terminal F (64 kb/sec), and data processing terminal D (16 kb/sec), and all signals of the INS64 service are used.

FIG. 3(c) shows telephone T (64 kb/sec
), image terminal G (64 kb/sec), and data processing terminal D (16 kb/sec), and in this case as well, all signals of the INS64 service are used.

As described above, the terminal section 102 to which the present invention is applied is composed of various terminals, but each function will be explained below by representing the case of only one telephone.

The communication signal output from the terminal section 102 is processed by a speed conversion circuit 131, which divides the communication signal into predetermined time intervals and increases (compresses) the speed (pitch in the case of an analog signal). The signal is applied to a wireless transmission circuit 132 including a transmission mixer 133 and a transmission section 134.

The output of the modulator included in the transmitting section 134 is converted to a predetermined radio frequency by the transmitting mixer 133,
The signal is transmitted from the antenna section and received by the wireless base station 30. In order to send a radio signal to the radio base station 30 using a time slot that is permitted to be used by the mobile radio device 100, timing information from the timing generator 142 shown in FIG. It is necessary that the

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

The mobile radio 100 further includes synthesizers 121-1 and 121-2, and a changeover switch 122.
-1, 122-2 and selector switch 122-1, 122
-2, the transmitter/receiver intermittent controller 123 and timing generator 142 are included, and the synthesizer 121-1, 121-2, the transmitter/receiver intermittent controller 123, and the timing generator 142 are the control unit. 140. Each synthesizer 121
-1 and 121-2 are supplied with a reference frequency from the reference crystal oscillator 120.

A radio base station 30 is shown in FIG. N-channel communication signal 22-1 with gateway switch 20
22-n are connected to the signal processing section 31 which forms an interface through a transmission path.

Now, the communication signals 22-1 to 22-n sent from the barrier exchange 20 are input to the signal processing section 31 of the radio base station 30. The signal processing section 31 is equipped with an amplifier for compensating for transmission loss, and also performs so-called 2-wire to 4-wire conversion. That is, the input signal and the output signal are mixed and separated, and the input signal from the barrier switch 20 is sent to the signal speed conversion circuit group 51. Further, the output signal from the signal speed restoration circuit group 38 is transmitted to the barrier exchange 20 by the signal processing section 31 using the same transmission path as the input signal. Among 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 speed (pitch) conversion is performed at predetermined time intervals. receive. Also, the signal transmitted from the wireless base station 30 to the barrier switch 20 is transmitted to the wireless receiving circuit 3.
The output of No. 5 is inputted to the signal speed restoration circuit group 38 via the signal selection circuit group 39, speed (pitch) converted, and inputted to the signal processing section 31.

Now, the control of the radio reception circuit 35 or the output of the call signal is performed by the signal selection circuit group 3 including signal selection circuits 39-1 to 39-n that select signals for each time slot.
9, where the speech signals are separated corresponding to each speech channel CH1 to CHn. This output undergoes signal speed (pitch) restoration in a signal speed restoration circuit group 38 including signal speed restoration circuits 38-1 to 38-n provided for each channel, and then is input to the signal processing section 31. , 4 line-2
After undergoing line conversion, this output is sent to the barrier switch 20 as communication signals 22-1 to 22-n.

Next, the function of the signal speed conversion circuit group 51 will be explained.

[0031] Input signals such as audio signals and control signals divided into a certain length of time are stored in a storage circuit, and when read out, the speed is changed, and the signal is read out at a speed that is, for example, 15 times faster than when it is stored. It becomes possible to compress the time length. The principle of the signal speed conversion circuit group 51 is the same as when playing back audio recorded by a tape recorder at high speed.
geCoupled Device ),BBD(Bu
cket Brigade Device) can be used, and the memory used in television receivers and tape recorders that compress or expand the time axis of conversations can be used (Reference: Kosaka et al.
A tape recorder that compresses and expands the time axis of conversations.”
Nikkei Electronics July 26, 1976
92-133).

CCD exemplified by signal speed conversion circuit group 51
As described in the above-mentioned document, a circuit using a BBD can also be used as it is for the signal speed restoration circuit group 38, and in this case, the clock from the clock generator 41 and the control signal from the control section 40 can be used as is. Upon receiving a timing signal from a timing generator 42 that generates timing,
This can be achieved by making the reading speed slower than the writing speed.

The control or audio signals outputted from the barrier switch 20 via the signal processing section 31 are input to the signal speed conversion circuit group 51, and after being subjected to speed (pitch) conversion processing, are converted into time slots. It is applied to a signal allocation circuit 52 that allocates signals separately.

This signal allocation circuit 52 is a buffer memory circuit, and the signal
The delimited high-speed signals are stored in memory, and the signals in the buffer memory are read out using timing information from the timing generation circuit 42 given in accordance with instructions from the control section 40, and sent to the wireless transmission circuit 32. As a result, when communication signals are viewed in terms of channels, they are arranged in series without overlapping in chronological order, and when all of the control signals or communication signals described below are implemented, they appear as if they were continuous signal waves. become.

The above-mentioned signals are sent to the wireless transmission circuit 32. The state of this compressed signal is shown in FIG. 5 and will be explained.

The output signals of the signal speed conversion circuit group 51 are input to a signal allocation circuit 52, and time slots are assigned in a predetermined order. SD of Fig. 5(a)
1, SD2, . . . , SDn indicate that the speed-converted communication signals are allocated to each time slot. Here, one time slot accommodates a synchronization signal and a control signal or/and a communication signal as shown in the figure. If a speech signal is not implemented, only a synchronization signal is used and an empty slot signal is added to the speech signal portion, or depending on the system, no signal is transmitted at all, including the carrier wave. In this way, Figure 5
As shown in (a), in the wireless transmission circuit 32,
A signal forming one frame is applied to the modulation circuit in time slots SD1 to SDn. The time-series multiplexed signal to be transmitted is angularly modulated in the radio transmission circuit 32, and then sent out into space from the antenna section.

Regarding the transmission of control signals between the radio base station 30 and the mobile radio device 100 prior to the telephone call when making or receiving a telephone call, whether within the telephone signal band or outside the telephone signal band is used. It is possible. FIG. 6 shows these frequency relationships. That is, in FIG. 4A, an example of an out-of-band signal is shown, and a low frequency side (250 Hz) or a 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. 6B shows an example of an in-band signal, which is used when making and receiving calls. The above examples were all tone signals, but by increasing the number of tone signals or modulating the tone to create a subcarrier signal, it is possible to transmit many types of signals at high speed.

The above was a case of analog signals, but if a digital data signal is used as a control signal, it is also possible to digitally encode the audio signal and time-division multiplex the two for transmission. , the circuit configuration in this case is shown in FIG. FIG. 7 shows an example of a case where an audio signal is digitized by a digital encoding circuit 91, the audio signal is multiplexed with a data signal by a multiplex conversion circuit 92, and the resultant signal is applied to a modulation circuit included in the wireless transmission circuit 32. However, for digital data signals, analog signal multiload gain, which will be described later, usually does not exist, so this point must be taken into account when designing the system. The audio signal and the control signal can be extracted separately by receiving the signal with the opposing receiver and performing the operation opposite to that shown in FIG. 7 in the demodulation circuit.

On the other hand, the signal sent from the mobile radio device 100 is received by the antenna section of the radio base station 30 and input to the radio reception circuit 35. FIG. 5B schematically shows this upstream input signal. That is, time slots SU1, SU2, . Further, the contents of each time slot SU1, SU2, ..., SUn are shown in detail as shown in the lower left of FIG. 5(b).
and) control signals. However, if the distance between mobile radio device 100 and radio base station 30 is small or depending on the signal speed, it is possible to omit the synchronization signal. Further, the waveform of the radio carrier wave of the uplink radio signal in FIG. 5(b) within a time slot is schematically shown in FIG. 8(c). Similarly, the downstream transmission waveform from the wireless base station 30 to each mobile radio device 100 in FIG. 5(a) is as shown in FIG. 8(d).

Now, among the input signals that have arrived at the radio base station 30, the control signal is immediately applied to the control section 40 from the radio reception circuit 35. However, depending on the magnitude of the speed conversion rate, it is also possible to apply the signal to the control unit 40 from the output of the signal speed restoration circuit group 38 after performing the same processing as the call signal. Further, a call signal is applied to a signal selection circuit 39. The signal selection circuit group 39 includes a control section 4
A timing signal from a timing generation circuit 42 that generates a predetermined timing is applied in response to an instruction from a control signal from 0, and a synchronization signal, a speech signal, or a control signal is separated and output for each time slot SU1 to SUn.

Each of these signals is processed by the signal speed restoration circuit 38.
is input to. This circuit has the function of inversely converting the speed conversion circuit 131 (FIG. 2) in the mobile radio device 100 on the transmitting side, and as a result, the original signal is faithfully reproduced and transmitted to the gateway exchange 20. Become.

[0042] The required transmission band of the signal in the present invention will be explained below.

As shown in FIG. 4, the control signal from the control section 40 is applied to the wireless transmission circuit 32 in parallel with the output of the signal allocation circuit 52. However, depending on the size of the speed conversion rate, the signal allocation circuit 5
It is also possible to add the output of 2 to the wireless transmission circuit 32. Next, as shown in FIG. 2, the mobile radio device 100 also has a circuit configuration required when one of the functions of the radio base station 30 is a communication path.

Original signal, for example, an audio signal (0.3 kHz
~3.0kHz) is the signal speed conversion circuit group 51 (Figure 4)
The frequency distribution on the output side when passing through is shown in FIG. That is, if the audio signal is converted 15 times as described above, the frequency distribution of the signal will be expanded to 4.5 kHz to 45 kHz, as shown in FIG. Although the frequency distribution of the signal is expanded here, it must be noted that the waveform form is simply subjected to a similarity transformation in which the frequency axis is stretched, and the waveform itself remains unchanged.

Now, FIG. 9 shows a case where the control signals are simultaneously transmitted using the lower frequency band of the audio signal. Of this signal, the control signal (0.2 to 4.0
kHz) and a speech signal CH1 (4.5-45 kHz, designated as SD1) is accommodated in a time slot, e.g. SD1. The same applies to the audio signals accommodated in the other time slots SD2 to SDn.

That is, time slot SDi (i=
2, 3,...,n) are control signals (0.2 to 4.0kHz
) and a communication signal CHi (4.5 to 45 kHz) are accommodated. However, the signals in each time slot are arranged in chronological order, and the signals in multiple time slots are not applied to the wireless transmission circuit 32 at the same time. In addition, the above control signals are not implemented when a time slot for control signals is provided at the beginning of the frame, and when the lower frequency band is used for other signals, the frequency of the communication signal Near the band (4.1-4.4kHz
z or 46 to 46.5 kHz).

Now, from the mobile radio device 100, the radio base station 3
0 is input to the radio reception circuit 35, a part of its output is input to the control unit 40, and the rest is sent to the signal speed restoration circuit group 38 via the signal selection circuit 39. . After the latter control signal undergoes speed conversion (conversion to a low speed signal) that is completely opposite to that at the time of transmission, it is transmitted to the general telephone network 10.
The signal speed is the same as that used in the signal processing section 31, and is sent to the barrier switch 20 via the signal processing section 31.

For communication using TCM signals according to the present invention, each time slot SD1 to SDn, SU1 to SUn
It is not necessarily necessary to provide a guard time as shown in FIG. 5 in between. However, in order to eliminate the influence of timing deviations of synchronization signals and delayed waves due to multiple waves on radio wave propagation, guard times may be provided between time slots as shown in FIG. 5. The specific value of the guard time varies depending on the system to which it is applied, but for example, for an indoor mobile phone system, it is 0.1 to 0.5 μs.
5 to 10 μsec is appropriate for EC and car telephones.

The above description is based on the terminal unit 1 to which the present invention is applied.
02 was a case where there was only one telephone. The system operation when the terminal unit 102 is composed of various terminals will be described below.

In FIG. 2, when a composite signal is sent from the radio base station 30 to the mobile radio device 100, this signal is received by the radio reception circuit 135 and sent to the speed restoration circuit 138.
The signal will be input to each designated terminal shown in FIG. 3 according to the identification signal inserted in each time slot. On the other hand, in the composite signal sent from the mobile radio device 100 to the radio base station 30, the terminal unit 102
After inserting an identification signal indicating the type of the other terminal,
After being transmitted to the speed conversion circuit 131 and undergoing speed conversion,
The signal is sent to the wireless transmission circuit 132 and transmitted to the wireless base station 30 via the antenna.

FIG. 10 shows the frame structure in this case. There are n time slots within one frame. In FIG. 10(a), SD1 to SDm are 1
This is for the telephone of the machine, and this has already been explained. Time slot numbers SDm+1 to SDn are for composite signals. The time slots for composite signals are generally written large because the amount of signal information is large;
For example, in the case of two telephones T1 and T2 shown in FIG. 3A, the time length of one time slot is twice the length of each frame SD1 to SDm.

Downlink time slot S in FIG. 10(a)
As shown in the figure, Dm+1 represents an example in which a speech (telephone) signal, an image signal, and a data signal are integrated and implemented. Note that a control signal may be temporarily inserted into the data signal portion. The upstream time slot SUm+1 in FIG. 10(b) is also the downstream time slot SD.
This is the same as m+1. However, while the former has a guard time installed between the two time slots, the latter does not have this. Therefore, when looking at the entire frame,
Since no guard time is installed, the frame length can be shortened and frequencies can be used more effectively. Figure 3
In the composite signal shown in (b), the time length of one time slot is the same as in the case shown in (a).

Next, the system to which the present invention is applied is characterized in that composite signals such as telephone and fax signals are processed as one signal. Conventional methods use two or more time slots within the same frame when communicating using multiple communication signals. Then, in order to set up a communication channel, signals such as telephone calls and fax signals are processed as separate communication signals, so the operation for setting up two or more independent communication channels in the mobile radio device 100 is as if the operation were to be performed as separate communication signals. It was necessary. For this reason, high communication control capabilities were required. If this ability was not high, there was a risk of loss of control when communication traffic was congested. By the way, when the present invention is applied, the requirement for communication control capability is reduced to almost the level of a conventional system, making system operation easier and more economical.

Next, the call originating and receiving operations of the system according to the present invention will be explained. However, regarding this operation, there is no major difference in system operation between composite signals and single signals, so the description will be made using the case of a single telephone signal.

(1) Diagram 11 of calling from mobile radio device 100
This will be explained using the flowchart shown in FIG.

When the power of the mobile radio device 100 is turned on, the radio receiving circuit 135 in FIG. Start capturing control signals. If the system is provided with multiple radio channels, i) the radio channel exhibiting the highest received input field ii)
(iii) A wireless channel instructed by a control signal included in the wireless channel (iii) A channel with an empty time slot among the time slots in the wireless channel, etc. CH1) is in the receiving state. This is possible by capturing the synchronization signal within time slot SDn shown in FIG. 5(a). In the control unit 140, the synthesizer 121-1
A control signal is sent to switch 1 to generate a local frequency that enables reception of wireless channel CH1.
22-1 is also tilted and fixed to the synthesizer 121-1 side.

Therefore, the telephone in the terminal section 102 is turned off.
When hooking (starting calling) (S201, Figure 11), Figure 2
The synthesizer 121-2 receives from the control unit 140 a control signal that generates a local frequency that enables transmission of the wireless channel CH1. Further, the switch 122-2 is also turned toward the synthesizer 121-2 side and becomes fixed. Next, the calling control signal output from the telephone unit 101 is sent out using the wireless channel CH1. This control signal is transmitted using the frequency band shown in FIG. 9, for example, using time slot SUn.

This control signal is sent in time slot S.
Since the signal is limited to Un and is sent in bursts and no signals are sent during other time periods, it does not adversely affect other communications. However, if the speed of the control signal is relatively slow or the amount of information in the signal is large and cannot be accommodated in one time slot, the control signal may be transmitted at the same time in one frame later or in the next frame. Sent using slots.

This control signal is transmitted in time slot S.
Since the signal is limited to Un and is sent in bursts and no signals are sent during other time periods, it does not adversely affect other communications. However, if the speed of the control signal is relatively slow or the amount of information in the signal is large and cannot be accommodated in one time slot, the control signal may be transmitted at the same time in one frame later or in the next frame. Sent using slots.

To capture time slot SUn,
Specifically, the following method is used. As shown in FIG. 5(a), the control signal transmitted from the radio base station 30 includes a synchronization signal and a control signal following it, and the mobile radio device 100 receives this, thereby achieving frame synchronization. It becomes possible. Additionally, this control signal includes information on currently used time slots and unused time slots (empty time slots).
Contains control information such as slot display). In some systems, time slots SDi (i=1, 2,
..., n) is used by other communications,
In some cases, it only contains a synchronization signal and a call signal;
Even in such a case, the unused time slots usually contain a synchronization signal and a control signal, and by receiving these control signals, the mobile radio 100 determines which time slot to use to send the calling signal. It is possible to know whether to send the .

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

Now, the call control signal from the mobile radio device 100 is successfully received by the radio base station 30, and the mobile radio device 100
Suppose that the ID (identification number) of is detected (S202),
The control unit 40 searches for a currently vacant time slot. The time slot given to the mobile radio device 100 may be SUn, but a search is performed just to be sure. This is to accommodate simultaneous calls from other mobile radios in addition to the mobile radio 100, and to provide time slots suitable for service types and service classifications.

As a result, for example, time slot SD
1 is vacant, the time slot SDn of the radio channel CH1 is used for the mobile radio device 100, and the time slot upstream (mobile radio device 10
0→radio base station 30) SU1, and the corresponding downlink (radio base station 30→mobile radio device 100) SD1 are instructed to be used (S203). In response, the mobile radio device 100 transitions to a state in which it can receive data in the instructed time slot SD1, and at the same time, the mobile radio device 100 shifts to a state in which it can receive data in the instructed time slot SD1, and at the same time, the mobile radio device 100 shifts to a state in which it can receive data in the instructed time slot SD1, and also transmits the time slot SU1 (FIG. 5), which is the time slot for the uplink radio channel corresponding to the downlink time slot SD1. b) Select ). At this time, in the control unit 140 of the mobile radio device 100, the transmission/reception intermittent controller 123 is operated, and the switch 122-1 is activated.
and 122-2 to start operating (S204). At the same time, a slot switching completion report is sent to the wireless base station 30 using uplink time slot SU1 (S205);
Wait for dial tone to be sent (S206)
.

[0064] The radio carrier wave time of this upstream radio signal
The state of slot SU1 is shown in FIG. 8(c). In addition to the time slot SU1, the radio base station 30 also receives SU as an uplink signal from another mobile radio device 100.
3 and SUn are included in one frame and sent. Upon receiving the slot switching completion report (S207), the wireless base station 30 sends the mobile wireless device 100 to the gateway switch 20.
A calling signal is sent together with the ID (S208). On the other hand, the gateway switch 20 detects the ID of the mobile radio 100, turns on the necessary switches among the switch groups included in the barrier switch 20 (S209), and dials the
The tone is sent to the wireless base station 30 (S210, FIG. 12
). This dial tone is transferred by the wireless base station 30 to the mobile wireless device 100 (S211), and the mobile wireless device 100 confirms that the communication path has been set (S2
12).

[0065] When transitioning to this state, the mobile radio device 100
Since a dial tone is heard from the handset of the telephone T included in the terminal section 102 of the telephone T, transmission of a dial signal begins. This dial signal is speed-converted by a speed conversion circuit 131, and sent from a radio transmission circuit 132 including a transmission section 134 and a transmission mixer 133 to an uplink time slot S.
It is sent using U1 (S213). Thus, the transmitted dial signal is transmitted to the wireless receiving circuit 3 of the wireless base station 30.
Received at 5.

[0066] This radio base station 30 has already responded to the calling signal from the mobile radio device 100 and has determined the time and date to be used.
At the same time, the signal selection circuit group 39 and signal allocation circuit group 52 of the wireless base station 30 are operated to receive the uplink time slot SU1 and to receive the downlink time slot SU1.
The state has shifted to the state where the signal of slot SD1 is transmitted. Therefore, the dial signal transmitted from the mobile radio device 100 is transmitted to the signal selection circuit 39-1 of the signal selection circuit group 39.
After passing through the signal speed restoration circuit group 38, the original transmission signal is restored and transferred to the gateway exchange 20 as a call signal 22-1 via the signal processing unit 31 (S21
4) A call path to the telephone network 10 is set (S215)
.

On the other hand, the input signal (initial control signal, call signal when a call is started) from the barrier switch 20 undergoes speed conversion at the signal speed conversion circuit group 51 in the wireless base station 30, and then is sent to the signal allocation circuit. Signal assignment circuit 52-1 of group 52
gives time slot SD1. Then, the time signal of the wireless channel downstream from the wireless transmission circuit 32 is
It is transmitted to mobile radio device 100 using slot SD1. The state of time slot SD1 of this downlink radio carrier wave is shown in FIG. 8(d).

[0068] In the mobile radio device 100, the radio channel CH
1 time slot SD1, it is on standby for reception and is received by the radio reception circuit 135, 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 T included in the terminal section 102. Thus, a call is started between the mobile radio device 100 and a regular telephone within the regular telephone network 10 (S216).

[0069] The end of the call is at the terminal section 102 of the mobile radio device 100.
By on-hooking the handset of the telephone T included in the telephone (S217), the end-of-call signal and the on-hook signal from the control unit 140 are transmitted from the wireless transmission circuit 132 to the wireless base station via the speed conversion circuit 131. 30 (S218), and the control unit 140 sends it to the transmission/reception intermittent controller 1.
23 is stopped, and switches 122-1 and 122-2 are fixed to the output ends of synthesizers 121-1 and 121-2, respectively.

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

In the above explanation, the exchange of control signals between the radio base station 30 and the mobile radio device 100 was explained as not passing through the signal conversion circuit group 51, the signal speed restoration circuit group 38, etc.; For the convenience of
Communication can be carried out without any problem even through the signal processing section 31 or the signal processing section 31.

(2) Incoming call to mobile radio device 100 The mobile radio device 100 is on standby with the power turned on. In this case, as explained in the section regarding the call origination from the mobile radio device 100, the mobile radio device 100 is in a waiting state to receive a downlink control signal of the radio channel CH1 in accordance with the procedure defined by the system.

[0073] An incoming call signal from the general telephone network 10 to the mobile radio device 100 via the barrier switch 20 is transmitted to the radio base station 30.
Suppose you arrive at These control signals are transmitted as communication signals 22 to the control section 40 (FIG. 4) via the signal rate conversion circuit group 51 and the signal allocation circuit group 52, similarly to the voice signals. Then, the control unit 40 uses an empty slot among the downlink time slots of the radio channel CH1 addressed to the mobile radio device 100, for example, SD1, to control the mobile radio device 100.
ID signal + incoming call signal display signal + time slot usage signal (for example, SD
1) is sent. In the mobile radio device 100 that receives this signal, it is transmitted from the receiving section 137 of the radio receiving circuit 135 to the control section 140. Control unit 14
0 confirms that this signal is an incoming call signal to its own mobile radio 100, so the telephone unit 101 makes a ring tone and at the same time waits at the designated time slots SD1 and SU1. Transmission/reception intermittent controller 12
3, and the switches 122-1, 122
-2 starts turning on and off. In this way, the state has shifted to a state in which calls can be made.

Next, the calling operation in the case of a composite signal will be explained. In this case, it is necessary to decide in advance what kind of communication will be performed with the other party's terminal. For example, when using a telephone and facsimile, a request signal for communication using the telephone and facsimile is added together with the ID (identification number) of the other party's terminal. After performing this preliminary operation, the call communication transmission button (corresponding to off-hook on a telephone) on the terminal unit 102 is turned on. This call control signal is sent to the wireless base station 30.
11 and the ID (identification number) of the mobile radio device 100 is detected.
There is no big difference from what was explained in 2. However, when setting up a communication path with the receiving terminal by sending a dial signal (S213), in the case of a composite signal, both telephone and facsimile communication paths are set up, and the two signals sent on the receiving side are separated. However, it is necessary to separate them into telephone and facsimile terminals. To achieve this separation, it is possible to use the first half of the time slot for telephone and the second half for facsimile, but to avoid errors, the transmitting side adds an identification signal to the telephone and facsimile signals, and the receiving side adds an identification signal to the telephone and facsimile signals. It is safe to use a method to decipher it.

[0075]

[Effects of the Invention] As is clear from the above explanation, if the present invention is applied to a system that includes non-telephone terminals such as telephones, facsimiles, images, data, etc. as communication terminals in the ISDN era, which is expected to be introduced worldwide in the future. For example, they can be used simultaneously using the same communication line. In this case, the effects of the present invention are extremely significant because the frequency can be used effectively and the system operation is easy and economical without requiring advanced communication control capabilities.

[Brief explanation of the drawing]

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

FIG. 2 is a circuit configuration diagram of an embodiment of a mobile radio device used in the system of the present invention.

FIG. 3 is a circuit configuration diagram showing various embodiments of a terminal section, which is one of the components of FIG. 2;

FIG. 4 is a circuit configuration diagram of an embodiment of a wireless base station used in the system of the present invention.

FIG. 5 is a time slot structure diagram for explaining time slots used in the system of the present invention.

FIG. 6 is a spectrum diagram showing the spectrum of a call signal and a control signal.

FIG. 7 is a circuit configuration diagram for multiplexing audio signals and data signals.

FIG. 8 is a waveform diagram showing radio signal waveforms of time slots.

FIG. 9 is a spectrum diagram showing spectra of time-compressed speech signals and control signals.

FIG. 10 is a time slot structure diagram for explaining another embodiment of the time slot used in the system of the present invention.

FIG. 11 is a flow chart showing the flow of operation of the system according to the present invention.

FIG. 12 is a flow chart showing the operation flow of the system according to the present invention in conjunction with FIG. 11;

[Explanation of symbols]

10 Telephone network 20 Gateway exchanges 22-1 to 22-n Communication signal 30 Radio base station 31 Signal processing section 32 Radio transmission circuit 35 Radio reception circuit 38 Signal speed restoration circuit group 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 section 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 79-1 ~ 79-n Low-pass filter 91 Digital encoding circuit 92 Multiplex conversion circuit 100, 100-1 ~ 100-n Mobile radio device 102
Terminal unit 120 Reference crystal oscillator 121-1, 121-2 Synthesizer 122-1,
122-2 Switch 123 Transmission/reception intermittent controller 131 Speed conversion circuit 132 Wireless transmission circuit 133 Transmission mixer 134 Transmission section 135 Wireless reception circuit 136 Reception mixer 137 Receiving section 138 Speed recovery circuit 141 Clock regenerator

Claims (1)

[Claims] 1. Each wireless base means (30) each covering a plurality of zones to form a service area;
each mobile radio means (100) using a radio channel carrying temporally compressed delimited signals in time slots of a frame structure for moving across said plurality of zones and communicating with said radio base means; In the time division communication method for mobile communication using barrier exchange means (20) for exchanging communications between - A time-division communication method for mobile communications that controls multiple slots so that they can be used all at once without providing a guard time between them.