JPH05145982A - Time division communication method for private communication network - Google Patents

Abstract

PURPOSE:To avoide the collision of calls by enabling communication between plural private communication networks PN 1 and PN 2 using TCM signals time-base compressed and partitioned into the time slots of frame constitution without inerposing a telephone network for public communication. CONSTITUTION:An interface IF is provided between the PN 1 and the PN 2 provided with a radio base station 30, mobile radio equipment 100 and cable telephone set 200. The time slot of the TCM signal from the PN 1 is turned to a non-TCM, a source signal is restored and turned into a TCM corresponding to the standard of the private communication network PN 2, and the time slot is transmitted to the side of the PN 2. The transmission from the PN 2 to the PN 1 is similarly processed. A terminal is provided with a priority order. Therefore, the collision of calls is avoided while reducing the degradation of transmission quality, reducing transmission time and eliminating burden for charging a telephone network 10 without detouring the telephone network 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection between local communication networks in an era when a large number of local communication networks are used.
Specifically, one private communication network has a large number of wired terminal means and mobile wireless terminals, and a telephone signal used for communication between a mobile wireless terminal or a wired terminal and another mobile wireless terminal or a wired terminal. For example, time division time compression multiplexing (a format in which a time-compressed partitioned signal is time division multiplexed into time slots having a frame structure, hereinafter referred to as T
(Abbreviated as CM) signal, and when the same TCM signal as above is used in other local area communication networks,
The present invention relates to a communication method that enables mutual connection of these two local communication networks.

[0002]

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

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

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

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

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

Reference 5. Ito "Time division time compression multiplexing (T
CM) Construction of on-premises communication network using signals "IEICE Technical Report C
S91-85 October 1991

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

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

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

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

Further, in Reference 5, when a TCM signal is used in addition to a conventional analog or digital signal in a local area communication network having a large number of wired terminals and mobile wireless terminals, sufficient consideration should be given to its application. By T
It explains that it is possible to realize a high-cost internal communication network that fully exhibits the characteristics of CM signals.

[0013]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the system construction example shown in (1), communication is performed using TCM signals in the same system, and when there are a plurality of systems, the operation for interconnecting them is not disclosed. Therefore, when the local communication networks applying the TCM signal try to establish mutual connection, it is necessary to do so via the public communication network interface. However, there are the following problems.

First, the point that the signal transmission path becomes a detour. This may be due to deterioration of signal transmission quality or occurrence of transmission delay. Next, there is a problem of billing (usage fee) associated with using the public communication network, which makes it expensive.

If it becomes possible to directly connect from one local communication network to another local communication network without going through the public communication network,
The above problem is solved.

Further, in order to enable mutual connection between terminals accommodated in different local area communication networks, unless a specific "calling priority" communication procedure (protocol) is set as described later, When terminals that want to communicate with each other call at the same time, signal collision may occur and communication may not be performed smoothly.

[0017]

DISCLOSURE OF THE INVENTION The present invention clarifies the interface conditions and communication procedure conditions required for mutual connection between two local communication networks to which TCM signals are applied. That is, when the parameters of the TCM signal used in each of the two local area networks are clear, the technical problem that occurs in the interface is that the time compression rate of the TCM signal is different. Difference in length Difference in number of multiplexed TCM signals Difference in frame length of TCM signals Difference in signal format of TCM signals, etc. Since direct connection is no longer possible, it is necessary for the interface to convert the frame structure of signals coming from one network to another network into the frame structure used in the incoming private network. , The interface is equipped with the converting means to absorb the difference between the and.

That is, the TCM from one of the local communication networks
The original signal is restored even if the signal is made non-TCM, and the signal is converted to TCM according to the standard (parameter) of the other local area communication network.

[0019]

As a result, even if the parameters of the TCM signal used in each of the two local communication networks are different, the operation at the destination of the signal from one local communication network to the other local communication network is different from that of the destination. It became possible to connect to each other exactly as each operation peculiar to the premises communication network.

In the above-mentioned two local communication networks, the transmission path serving as a signal detour is eliminated because the mutual communication can be directly performed without passing through the public communication network. This is effective in avoiding the possibility of deterioration of signal transmission quality and transmission delay. Next, the problem of billing (usage fee) associated with the use of the public communication network is solved and the communication cost can be reduced.

In order to smoothly execute communication between terminals accommodated in different local area communication networks, for example,
I decided to take one of the following measures. i) One local communication network is the master and the other local communication network is the slave, and priority is given to the introduction of signals from the master local communication network to the slave local communication networks. ii) An ID allocation method common to all terminals accommodated in the two local area communication networks is used, and in the case of a signal collision, one is prioritized over the other by collating the IDs. iii) According to the contents of communication for each call, the display of "priority" and "non-priority" common to the two local area communication networks is given to give priority to the communication of the terminal with high priority.

[0022]

Embodiments of the present invention will be described in the following order. 1. One wireless system (wireless private network)
Example applied to 2. An embodiment in which the present invention is applied to the connection of two private communication networks

1. Embodiment in which the present invention is applied to one wireless system (wireless local area communication network)

1.1. Principle of TCM Signal First, the principle of the TCM signal which plays a major role in the present invention will be described.

A telephone signal (0.3 to 3 kHz), for example, 10
After cutting at msec intervals (this is called a time segment), these signals are stored in a memory circuit and then read out at a high speed of 10 times, for example, they are compressed into 1msec time segments. , A packet-like signal having a signal frequency component of 3 to 30 kHz is obtained. As a result of this signal processing, the remaining 9/10 time resulting from the time compression of 10 times is used for the telephone signal (compressed) of another call (TCM signal). Therefore, when viewed from the transmitting end, 10 different compressed audio signals are transmitted in a time division manner. In the case of wired transmission, the obtained TCM signal is amplified to an appropriate level and then sent out to the transmission line. For wireless systems,
The fixed radio base station FM (frequency modulates) the TCM signal and sends it out from the antenna. The receiving unit of the mobile radio that received this radio signal extracts only the specified packet-shaped signal in each frame, amplifies it to an appropriate level, demodulates it with a frequency discriminator, and lowers it to 1/10 When read with, the original signal is restored.

1.2. Embodiment in which the present invention is applied to one wireless system (wireless local area communication network)

FIG. 1 shows a conceptual block diagram when the present invention is applied to two local communication networks PN1 and PN2.
Since the two local communication networks PN1 and PN2 have the same configuration, the local communication network PN1 will be representatively described.

The telephone network 10 which is a general public communication network is connected to a private branch exchange 17-1 generally called PBX, and a radio base station 30-1-1 connected to the private branch exchange 17-1 in the private branch communication network PN1. Through 30-1-i, it is possible to communicate with mobile radios 100-1-1 through 100-1-n. The private branch exchange 17-1 has a wired telephone 200-1.
-1-200-1-p are also connected and can also communicate with the telephone network 10. Further, since the private branch exchange 17-1 has a star-shaped network structure in the private branch network PN1, many mobile wireless devices 100 and many telephones 200 included in the private branch network PN1. Any combination of these can be used for communication.

When the private network PN1 side and the private network PN2 side communicate with each other, both private branch exchanges 17-1 and 17-
This is done via an interface IF for connecting the two.

FIG. 2 shows one wireless base station 30 as a representative of the wireless system of one local area communication network PN1 to which the TCM signal which is a main function of the present invention is applied. The operation principle will be described.

Now, in the system to which the present invention is applied, the analog telephone signal is converted to TC in order to explain its principle.
The case of using after converting to M will be described.

In FIG. 2, reference numeral 10 is a general telephone network, and 17 is a private branch exchange (PBX) for switching and connecting the telephone network 10 and a wireless system. Reference numeral 30 is a wireless base station, which has an interface with the private branch exchange 17, a circuit for converting the speed of signals, a circuit for allocating and selecting time slots, a control unit, etc. for setting and releasing a wireless line. In addition, the mobile radio 100 (100-1 to 100-
n) has a wireless transmission / reception circuit for exchanging wireless signals with the wireless communication circuit. Here, between the private branch exchange 17 and the radio base station 30, there are transmission lines for transmitting the communication signals 22-1 to 22-n including the communication signals of the communication channels CH1 to CHn and the control signals. The private branch exchange 17 is connected to the private branch communication network PN2 via an interface IF.

FIG. 3 illustrates the principle of the present invention.
The circuit configuration of the mobile wireless device 100 that communicates with the wireless base station 30 is shown. Received signals such as control signals and call signals received by the antenna unit enter the wireless reception circuit 135 including the reception mixer 136 and the reception unit 137, and the output communication signal is the speed restoration circuit 138 and the control unit 140.
Is input to 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 compressed and delimited communication signal in the received signal and inputs it to the telephone unit 101 and the control unit 140 as a continuous signal. ing.

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

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

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

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

FIG. 4 shows a radio base station 30 for explaining the principle of the present invention. The n-channel communication signals 22-1 to 22-n with the private branch exchange 17 are connected to a signal processing unit 31 that forms an interface on a transmission line.

The communication signals 22-1 to 22-n sent from the private branch exchange 17 are input to the signal processing unit 31 of the radio base station 30. The signal processing unit 31 is provided 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 private branch exchange 17 is sent to the signal speed conversion circuit group 51. The output signal from the signal speed restoration circuit group 38 is transmitted to the private branch exchange 17 in the signal processing unit 31 using the same transmission path as the input signal. The input signal from the private branch exchange 17 is input to the signal speed conversion circuit group 51 including many signal speed conversion circuits 51-1 to 51-n, and the speed (pitch) conversion is performed at predetermined time intervals. receive. The signal transmitted from the radio base station 30 to the private branch exchange 17 is the radio reception circuit 3
The output of No. 5 is input to the signal speed restoration circuit group 38 via the signal selection circuit group 39, speed (pitch) converted, and input to the signal processing unit 31.

The control of the radio receiving circuit 35 or the output of a call signal is input to a signal selection circuit group 39 including signal selection circuits 39-1 to 39-n for selecting a signal for each time slot, and here, each call channel is selected. Call signals are separated corresponding to CH1 to CHn. This output is input to the signal processing unit 31 after being restored in the signal speed (pitch) by the signal speed restoring circuit group 38 including the signal speed restoring circuits 38-1 to 38-n provided for each channel. After receiving the 4-wire / 2-wire conversion, this output is transmitted to the private branch exchange 17 as a communication signal 22-.
1 to 22-n.

Next, the function of the signal speed conversion circuit group 51 will be described. The input signal such as a voice signal or a control signal, which is divided into a certain time length, is stored in a storage circuit, and the speed is changed when reading the input signal, and the read signal is read at a speed of, for example, 15 times that of the storage time. Can be compressed. The principle of the signal speed conversion circuit group 51 is tape
This is the same as when a voice recorded by a recorder is reproduced at high speed. In practice, for example, a CCD (Charge Coupled
Device) and 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. “ Tape recorder that compresses / expands the time axis of conversation "Nikkei Electronics July 26, 1976 92-133
page).

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

The control or voice signal output from the private branch exchange 17 via the signal processing unit 31 is input to the signal speed conversion circuit group 51, and after the speed (pitch) conversion processing is performed, the time slot It is applied to a signal allocation circuit 52 which separately allocates signals.

The signal allocating circuit 52 is a buffer memory circuit, which outputs 1 signal output from the signal speed converting circuit group 51.
A high-speed signal corresponding to a delimiter is stored in memory, the signal in the buffer memory is read out by the timing information from the timing generation circuit 42 given by the instruction of the control unit 40, and the signal is sent to the wireless transmission circuit 32. As a result, when the communication signals are viewed as channels, they are arranged in series without overlap in time series, and when all the communication signals or control 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. S in FIG. 5 (a)
Dn, SD2, ..., SDn indicate that the speed-converted communication signals are assigned to each time slot. Here, in one time slot, a synchronizing signal and a call signal or / and a control signal are accommodated as shown in the figure. When the call signal is not installed, an empty slot signal is added to the call signal portion only with the synchronization signal, or in some systems, no signal including the carrier wave is transmitted. In this way, as shown in FIG. 5A, in the wireless transmission circuit 32, a signal forming one frame in the time slots SD1 to SDn is added to the modulation circuit. The multiplex signals time-serialized to be transmitted are angle-modulated in the wireless transmission circuit 32, and then transmitted to the space from the antenna section.

Regarding the transmission of the control signal between the radio base station 30 and the mobile radio 100 prior to the telephone call when making or receiving a telephone call, regardless of whether the telephone signal is in the band or out of the band. It is possible. FIG. 6 shows these frequency relationships. That is, in the figure (a), the out-of-band signal is illustrated, and 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. 6B shows an example of the in-band signal, which is used at the time of incoming and outgoing calls. In the above examples, tone signals are used. However, by increasing the number of tone signals or modulating the tones to form subcarrier signals, it is possible to transmit various types of signals at high speed.

Although the above is the case of the analog signal, when the digital data signal is used as the control signal, it is also possible to digitally encode the voice signal and time-division multiplex both of them for transmission. FIG. 7 shows the circuit configuration in this case. FIG. 7 shows an example in which the voice signal is digitized by the digital encoding circuit 91, and the data signal and the data signal are multiplex-converted by the multiplex conversion circuit 92 and applied to the modulation circuit included in the wireless transmission circuit 32. However, for digital data signals, the analog signal multiple load gain, which will be described later, does not normally exist, so this point must be noted in the system design. Then, if the opposite receiver receives the signal and the demodulation circuit performs the reverse operation to that shown in FIG. 7, the audio signal and the control signal can be separately taken out.

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. 5B schematically shows this 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. 5B, it is composed of a call signal and / or a control signal. However, the synchronization signal can be omitted depending on the case where the distance between the mobile wireless device 100 and the wireless base station 30 is small or the signal speed. Further, when the waveform of the radio carrier of the uplink radio signal of FIG. 5B in a time slot is schematically shown, FIG.
It becomes like (c). Similarly, the downlink transmission waveform from the wireless base station 30 to each mobile wireless device 100 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 the inverse conversion of the speed conversion circuit 131 (FIG. 3) in the mobile radio device 100 on the transmission side, whereby the original signal is faithfully reproduced and transmitted to the private branch exchange 17. 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 with the adjacent radio channel.

As shown in FIG. 4, 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, also in the mobile wireless device 100, as shown in FIG. 3, the circuit configuration required when the communication path is one channel among the functions of the wireless base station 30.

Original signal, eg voice signal (0.3 kHz-
A frequency distribution of 3.0 kHz) on the output side when the signal speed conversion circuit group 51 (FIG. 4) is passed is as shown in FIG. That is, if the audio signal is converted 15 times as described above, the frequency distribution of the signal is as shown in FIG.
It means that the frequency is expanded to 4.5 kHz to 45 kHz. Although the frequency distribution of the signal is expanded here, it should be noted that the shape of the waveform simply undergoes a similarity transformation in which the frequency axis is stretched, and the waveform itself does not change.

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

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

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 for the private branch exchange 17 via the signal processing unit 31.

The calling operation of the mobile radio 100 will be described with reference to the flow charts shown in FIGS.

When the power of the mobile wireless device 100 is turned on, in the wireless receiving circuit 135 of FIG. 3, 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). Start capturing control signals. If the system is provided with multiple radio channels, i) the radio channel showing the maximum received input field ii) the radio channel indicated by the control signals contained in the radio channel iii) Within the radio channel , The wireless channel (hereinafter referred to as channel CH1) is being received according to the procedure defined in the system, such as the channel having an empty time slot. This is possible by capturing the sync signal in the time slot SDn shown in FIG. 5 (a). In the control unit 140, the synthesizer 121-1
To the switch 1 so as to generate a local oscillation frequency that enables reception of the radio channel CH1.
22-1 is also in a state of being tilted down and fixed to the synthesizer 121-1 side.

Therefore, the telephone of the telephone section 101 is turned off.
When hooked (beginning of call) (S201, FIG. 10), FIG.
The synthesizer 121-2 receives the control signal from the control unit 140 so as to generate the local oscillation frequency that enables the 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 transmitted by the frequency band shown in FIG. 9 using, for example, the time slot SUn.

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

To capture the time slot SUn,
Specifically, the following method is used. As shown in FIG. 5A, the control signal transmitted from the radio base station 30 includes a synchronization signal and a control signal that follows the synchronization signal. The mobile wireless device 100 receives the synchronization signal and the frame synchronization. Will be possible. Further, the control signal includes control information such as a currently used time slot and an unused time slot (empty time slot display). Depending on the system, the time slot SDi (i = 1,
2, ..., N) may contain only a sync signal and a call signal when they are used by other communication, but even in such a case, an unused time slot usually has a sync signal and a control signal. A signal is included, and by receiving this control signal, it is possible to know which time slot the mobile radio device 100 should use to send the calling signal.

When all the time slots are in use, it is impossible to make a call on this radio channel and it is necessary to sweep and search another radio channel.
In another system, there is a case where an empty slot is not displayed in any time slot, and at this time, the following audio multiplexed signals SD1, SD2, ..., SD
It is necessary to search for the presence of n one after another to check for empty time slots.

Returning to the present discussion, the mobile radio 100, which has received the control information sent from the radio base station 30 by any of the above methods, sends out the call control signal at which time slot. Whether or not it should be possible can be determined by including the transmission timing. Therefore, assuming that the uplink signal time slot SUn is an empty slot, this empty time slot is used, and a call control signal is transmitted to extract the required timing from the response signal from the radio base station 30. As a result, a burst control signal can be transmitted.

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

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

As a result, for example, time slot SD
1 is available, the time slot SDn of the radio channel CH1 is used for the mobile radio device 100 by the downlink control signal (time slot uplink (mobile radio device 10)).
0 → Radio base station 30) SU1, and the corresponding downlink (radio base station 30 → mobile radio 100) SD1 is instructed using the time slot SDn (S203). In response to this, the mobile wireless device 100 shifts to a state in which it can be received in the instructed time slot SD1 and also is a time slot SU for the uplink radio channel corresponding to the downlink time slot SD1.
1 (see FIG. 5B) is selected. At this time, in the control unit 140 of the mobile wireless device 100, the transmission / reception interruption controller 1
23 to operate the switches 122-1 and 122-2.
Is started (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 shown in FIG. 8 (c). In addition to the time slot SU1, the radio base station 30 receives SU as an uplink signal from another mobile radio 100.
3 and SUn are sent in one frame. In the wireless base station 30 that has received the slot switching completion report (S207), the mobile wireless device 100 is addressed to the private branch exchange 17.
The calling signal is sent out together with the ID of (S208). On the other hand, the private branch exchange 17 detects the ID of the mobile wireless device 100 (S209) and sends a dial tone to the wireless base station 3
0 (S210, FIG. 11). This dial tone is transferred to the mobile wireless device 100 by the wireless base station 30 (S211), and the mobile wireless device 100 confirms that the communication path of the wireless section 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 private branch exchange 17 as a dial signal via the signal processing unit 31 (S21).
4).

When the private branch exchange 17 receives this dial signal and confirms that the called telephone is the telephone 200 under its own control (private branch exchange 17) (S215),
A ringing tone is sent to the called telephone (telephone 200) (S216). When the telephone 200 receives this ringing tone, the ringing tone sounds (S217). So telephone 20
When the receiver of 0 is hung / off (S218), the private branch exchange 17 confirms this, and turns on the switches included therein (S219), and the mobile radio 100, the radio base station 30, and the private branch exchange 17 A communication path is set between the telephones 200 via.

The input signal from the private branch exchange 17 (initial control signal, call signal if a call is started) 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. The state of the time slot SD1 of the downlink radio carrier is shown in FIG. 8 (d).

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 telephone 200 housed in the private branch exchange 17 (S220, FIG. 12).

The end of the call is the telephone section 101 of the mobile radio 100.
By hooking the handset of (S221),
The end signal and the on-hook signal from the control unit 140
The signal is sent from the wireless transmission circuit 132 to the wireless base station 30 via the speed conversion circuit 131 (S222), the control unit 140 stops the operation of the transmission / reception on / off controller 123, and the switches 122-1 and 122- 2 is fixed to the output terminals of the synthesizers 121-1 and 121-2, respectively.

On the other hand, in the control section 40 of the radio base station 30,
Upon receiving the call-end signal from the mobile wireless device 100, the call-end signal is transferred to the private branch exchange 17 (S223), the private branch exchange 17 turns off the switch of the switch group (not shown), and sends the call-end signal to the telephone set 200. To end the call (S2
25). At the same time, the signal selection circuit group 39 in the radio base station 30
And the signal allocation circuit group 52 is opened. The telephone 200 that receives the call termination signal (S226) confirms the call termination and ends the call (S227).

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.

Next, the operation of receiving a call to the mobile wireless device 100 will be described. The mobile wireless device 100 is in a standby state with the power turned on. In this case, as described in the calling operation 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.

Telephone 2 housed in private branch exchange 17
It is assumed that an incoming call signal to the mobile wireless device 100 arrives at the wireless base station 30 from 00 via the private branch exchange 17. 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. 4) through the signal allocation circuit group 52, similarly to the voice signal. Then the control unit 4
At 0, an empty slot of the downlink time slots of the radio channel CH1 addressed to the mobile radio 100, for example, SD1
Is used to send out an ID signal of the mobile wireless device 100 + an incoming call signal display signal + a time slot use signal (for transmission from the mobile wireless device 100, SU1 corresponding to SD1 is used, for example). Mobile radio 100 that receives this signal
Then, from the receiving unit 137 of the wireless receiving circuit 135 to the control unit 1
40 is transmitted. The control unit 140 confirms that this signal is an incoming call signal to the mobile wireless device 100 of its own, so that the telephone unit 101 sounds a ringing tone and at the same time waits at the instructed time slot SD1, SU1. The transmission / reception gating controller 123 is operated as described above, and the switches 122-1 and 122-2 are turned on and off. Thus, the call is ready to be made.

The above description is for the mobile radio 1 for telephone communication.
00 was an incoming / outgoing call operation for the wired telephone 200 accommodated in the same private network as the wired telephone 2
The incoming and outgoing call operation of 00 is simpler than that of the mobile wireless device 100 which is a wireless telephone because there is no need to acquire a wireless channel. Further, the call originating / receiving operation of the non-telephone terminal is possible in the same manner as above.

2. Embodiment in which the present invention is applied to the connection of two private communication networks First, the function of the interface IF in FIG. 1 will be described.

The standards (parameters) of the TCM signals possessed by the two local communication networks PN1 and PN2 are assumed as follows. Time compression ratio of TCM signal r ₁ r ₂ Time length of TCM signal Time length of signal t ₁ t ₂ TCM signal multiplex number n m TCM signal frame length Signal format of T ₁ T ₂ TCM signal

The interface IF has the following functions. That is, the parameters r ₁ of the TCM signals described above are converted to r ₂ , t ₁ is converted to t ₂ , n is converted to m, and T ₁ is converted to T ₂ with respect to a signal that enters from the local area communication network PN1 to PN2. That is, the parameters of the local area communication network PN1 are converted into the unique parameters of the local area network PN2. On the other hand, with respect to a signal that enters the local communication network PN1 from the local communication network PN1, the above items 1 to 3 are converted into parameters unique to the local communication network PN1.

A specific circuit configuration for executing the following conversion will be described below. The operation principle of this circuit is, in one word, after reproducing the original signal from the TCM signal input from the local area network PN1, the TCM signal is created again using the standard (parameter) specific to the local area network PN2. While transmitting to the private branch exchange 17-2 of the private branch network PN2,
After reproducing the original signal from the TCM signal input from the local area communication network PN2, the TCM signal is created again using the TCM conversion parameter unique to the local area network PN1.
1 to the private branch exchange 17-1.

FIG. 13 shows a circuit configuration diagram of an embodiment of the interface IF. Since the configuration is symmetrical on the left and right of the alternate long and short dash line in the center of FIG. 13, a detailed circuit configuration diagram of the right half circuit is shown in FIG. The operation will be described with reference to FIGS. 13 and 14.

A local communication network P on the right side of FIGS. 13 and 14.
T sent from N1 to the local communication network PN2 on the left
Suppose a CM signal comes in. This signal is received by the signal receiving circuit 3
After being received at 35a and amplified to an appropriate level, one part goes to the control section 340a and the clock regenerator 341a, and the other part goes to many signal selection circuits 339a, eg five.
Signal selection circuit 33 including -1 to 339a-5 (FIG. 14)
9a respectively. As for the signal sent to the control unit 340a, a control signal included in the signal is extracted and used as control information necessary for control. Clock regenerator 3
When the signal is sent to 41a, the clock included in the signal is reproduced there and sent to the control section 340a and the timing generation circuit 342a, respectively.
The latter are each used for timing generation. It is natural that the system parameters of the local area communication network PN1 are used for the operation of each of these units.

The signal sent to the signal selection circuit group 339a is subjected to the same signal processing as that described in the signal selection circuit group 39 of FIG. 4, and then many, for example, five signal speed restoration circuits 338a- 1-338a-5 (see FIG. 1
4) It is sent to the signal speed restoration circuit group 338a. The operation of the signal speed restoration circuit group 338a is also similar to that already described for the signal speed restoration circuit group 38 in FIG. 4, in which processing is performed and the transmitted original signal is reproduced.
Therefore, again, T according to the system parameter of the local area communication network PN2
Signal speed conversion circuit group 351b for undergoing CM conversion processing
Sent to.

The control unit 340a has been used up to this point.
The operation of the signal speed conversion circuit group 351b is managed by the control unit 340b. That is, the operation of the control unit 340b is controlled by the control signal included in the TCM signal sent from the private network PN2 on the left side of FIG. 13 to the private network PN1. TC from the local communication network PN2
The M signal is received by the signal receiving circuit 335b and amplified to an appropriate level, then part of it is sent to the control section 340b and the clock regenerator 341b, and the other is sent to the signal selection circuit group 339b. As for the signal sent to the control unit 340b, the control signal included in the signal is taken out and used as control information necessary for control. When the signal is sent to the clock regenerator 341b, the clock included in the signal is regenerated, and the clock is sent to the control unit 340b and the timing generation circuit 342b, respectively, the former for control operation and the latter for timing generation. Used respectively.

Now, the operation of the signal speed conversion circuit group 351b, which is controlled by the control unit 340b, is performed by the system parameter used in the private network PN2. That is, the operation of the signal speed conversion circuit group 351b is similar to that of the signal speed conversion circuit group 51 described above. The time compression ratio of the signal is r ₂ instead of r ₁ , and the signal speed restoration circuit group 338 a
The original audio signal (the same applies to the image and data signals) is reconstructed from the original audio signal and separated. This is done at t ₂ instead of the time length t ₁ of the time piece signal. This output is sent to the signal allocation circuit group 352b and undergoes the same signal processing as the signal allocation circuit group 52 of FIG. The signal processing here is
The number of multiplexed TCM signals is n, and the frame length of the TCM signals is T ₂ instead of T ₁ . As the guard time length, the value used in the local area network PN2 is used. This output is sent to the signal transmission circuit 332b. In the signal transmission circuit 332b, amplification is performed in order to compensate for the level required for signal reception of the private branch exchange 17-2 of the private branch network PN2, and control signals similar to those used in the private branch network PN2, etc. Is added. As a result, TCM
All the signal formats of the signals will be unified to the local area network PN2.

Although the above description is for the TCM signal sent from the local communication network PN1 to the local communication network PN2, conversely the same applies to the TCM signal sent from the local communication network PN2 to the local communication network PN1. Signal conversion is performed. However, in this case, the operation of each unit is performed with a value obtained by exactly reversing the method parameter.

Also in the signal speed conversion circuit group 351a and the signal allocation circuit group 352a, as shown in FIG. 14, a large number of signal speed conversion circuit groups 351a-1 such as five signal speed conversion circuit groups 351a-1.
To 351a-5 and signal assignment circuit groups 352a-1 to 352a-1.
52a-5 is included.

FIG. 15 shows a situation in which time slots are exchanged via the interface IF between the private network PN1 and PN2. Here, the case where the number of multiplexing is 5 out of the functions of the interface IF is shown. This value is an example and may be any value. Further, the positions of the five time slots in the frame are set at the beginning of the frame, but this is also an example, and the positions may be set at arbitrary positions. However, each local communication network PN1, PN
Both have the same frame structure of the TCM signal used in each network.
Slots should be used for network connections without using them, except when traffic is congested.

The local area communication networks PN1 and PN2 shown in FIG.
The system parameters of are shown in the following cases. i) Time compression rate of TCM signal ... PN1
Is higher than PN2 ii) Time length of time piece of TCM signal ... Assume that it is the same iii) Multiplex number of TCM signal ... PN
It is assumed that 1 is higher than PN2. Iv) Frame length of TCM signal ・ ・ ・ ・ ・ ・ Assumed to be the same v) Signal format of TCM signal ・ ・ ・ Control signal is inserted in each time slot Assuming

In FIG. 15, TC on the local communication network PN1 side
Since the compression rate of the M signal is higher than that on the private network PN2 side, the time slots S1-1 to S on the private communication network PN1 side.
1-5 and time t ₁ having a width of S21-1 to S21-5 is the time slot S12-1 on the side of the private network PN2.
~ S12-5 and S2-1 to S2-5 width time t ₂
Is smaller than. When the time slots S1-1 to S1-5 from the local communication network PN1 are sent to the local communication network PN2, the time slots S12-1 to S12-5 are sent.
And the time slot S from the local communication network PN2 side
When 2-1 to S2-5 are sent to the local area network PN1 side, they are converted into time slots S21-1 to S21-5.
However, since the time compression rate of the signal, the location of the allocated time slot, or the number of multiplexed TCM signals are different between the two internal communication networks PN1 and PN2, a slight signal delay occurs at the interface IF, but this does not stop. I don't get it. However, this amount of delay is generally smaller than the amount of delay that occurs when connecting through the public telephone network 10, so the advantage of the present invention does not change.

As a result of the operation of the interface IF, each operation in the local communication network PN2 of a signal to enter from the local communication network PN1 to the local communication network PN2 is performed by the local communication network P.
The operation of each signal peculiar to N2 is exactly the same as that of each signal. On the other hand, each operation in the local communication network PN2 that gets into the local communication network PN1 from the local communication network PN2 is exactly the same as each operation unique to the local communication network PN2. Communication between the local communication network PN1 and the local communication network PN2 is completely possible.

Next, two local communication networks PN1 and PN2
The operation of making and receiving calls across (FIG. 1) will be described. 16 to 18 show a flow of operations when one of the mobile wireless devices 100 housed in the private branch exchange 17-1 calls the wired telephone 200 housed in the private branch exchange 17-2. .. The mobile wireless device 100 is off-hook (S30
1, FIG. 16) to the wireless base station 30 transferring the dial signal (S314, FIG. 17) is the same as steps S201 to S214 shown in FIGS. 10 and 11.

The private branch exchange 17-1 which received the dial signal from the radio base station 30 checks the content (ID) of the incoming dial signal, and as a result, the called telephone 200 is accommodated in the private branch exchange 17-2. Interface (I) because it recognizes that it is a telephone that is being used (315).
An incoming call signal is sent to the private branch exchange 17-2 via F (FIG. 1) (S316).

The private branch exchange 17-2 receives the incoming call signal and inspects the contents (ID). As a result, it is confirmed that the telephone 200 being called is the telephone 200 housed in the private branch exchange 17-2 itself. Because it recognizes, the telephone 20
A call signal is sent to 0 (S317). The telephone 200 receives this calling signal and sounds a ringing tone. When the handset of the telephone 200 is hung / off (S31
9), this information is sent to the private branch exchange 17-2 to turn on a group of switches (not shown),
This information is transferred to the private branch exchange 17-1 (S32).
0).

Upon receiving this hang-off information, the private branch exchange 17-1 turns on the switch group (not shown) included therein (S321). Thus, a communication path is set between the mobile wireless device 100 and the telephone 200, and a communication is started (S322, FIG. 18).

The telephone call unit 101 of the mobile radio 100 is used for ending the call.
This is done by hooking up the telephone at step S32 (S32
3), an on-hook signal and a call end signal are sent to the radio base station 30 (S324). The radio base station 30 confirms the termination of the call, and sends the on-hook signal and the termination signal to the private branch exchange 17-.
1 is transferred (S325). Private branch exchange 17-1
Then, turn off the switches included in the switch and turn on the private branch exchange 1.
An end signal is sent to 7-2 via the interface IF (S327). Upon receiving the call end signal, the private branch exchange 17-2 turns off the switches included therein (S
328), and sends an end signal to the telephone 200 (S32).
9). The telephone 200 receives the call end signal, confirms the call end, and ends the call (S340).

Next, in order to enable smooth interconnection between terminals accommodated in different local communication networks, a specific "calling priority" communication procedure (protocol) as described above must be set. I have to. That is, if the called telephones among the terminals wishing to communicate with each other call the third party at the same time, a signal collision occurs, and the calling telephone and the called telephone cannot communicate smoothly. ..

Therefore, one of the following measures is taken. One local communication network is used as a master and the other local communication network is used as a slave, and priority is always given to the introduction of signals from the master local communication network to the slave local communication networks. An ID allocation method common to all terminals accommodated in the two local area communication networks is used, and when signals collide, one is prioritized over the other by collating the IDs. Depending on the contents of the communication for each call, the display of "priority" and "non-priority" common to one local area communication network is given to give priority to the communication of the terminal having a high "priority".

19 to 22 show the operation when the mobile wireless device 100 starts the calling operation to the telephone 200, while the telephone 200 starts the simultaneous calling operation to the third party. It shows the flow. Then, the mobile wireless device 10
0 is a terminal having a high “priority” with respect to the telephone 200 for any of the above reasons.

The mobile radio 100 is off-hook (S40
1, FIG. 19) and then the private branch exchange 17-1 sends an incoming call signal to the private branch exchange 17-2 (S416, FIG. 20).
The operation up to step S301 of FIG. 16 and FIG.
It is the same as the operation up to S316. At this time, the telephone 200 being called from the mobile wireless device 100 is off-hook to call the third party (S417, FIG. 2).
0), since the private branch exchange 17-2 detects the ID of the telephone 200 (S418), it sends a dial tone to the telephone 200 (S419). When the telephone 200 receives the dial tone (S420), it sends a dial signal (S421). Upon receiving this, the private branch exchange 17-2 inspects the incoming dial signal (ID) (S422).

At that time, the private branch exchange 17-2 receives the incoming call signal from the private branch exchange 17-1 (S42).
3). That is, a call collision occurs. Private branch exchange 17-2
Then, the ID of the called telephone 200 is compared with the ID of the mobile radio 100 housed in the private branch exchange 17-1 (S
424, FIG. 21). When it is confirmed that the terminal has a high “priority” for any of the above reasons (S425Y), the telephone 200 is abandoned (rejected) to make an incoming call from the mobile wireless device 100. Is accepted (call path is set) (S42)
6). Therefore, the private branch exchange 17-1 is notified of the decision, and the private branch exchange 17-2 turns on the switch group (S427). The private branch exchange 17-2 that received this notification also turns on the group of switches (S428), the communication path between the mobile wireless device 100 and the telephone 200 is set, and the communication is started (S429).

If the telephone set 200 recognizes that it is a terminal having a "higher priority" than the mobile radio set 100 (S425N), the private branch exchange 17-1 receives an incoming call from the mobile radio set 100 to the telephone set 200. A request signal for giving up is transmitted (S430, FIG. 22). At this time, the private branch exchange 17-1 transmits a busy tone to the mobile wireless device 100 via the wireless base station 30 (S431 to S43).
4). Mobile radio 100 that receives this busy tone
Then, give up the calling operation and hang on (S435, S435).
S436). On the other hand, the telephone 200 is a private branch exchange 17-2.
The call origination operation is continued via (S437).

By adopting the "priority communication method" as described above, signal collision can be prevented in advance, and communication can be smoothly performed between the calling telephone and the called telephone.

In the above description, the local communication networks PN1, PN
The TCM signals used in Section 2 have been described assuming only analog telephone signals. Moreover, although the wireless system has been described as a representative, the present invention can be similarly applied to a wired telephone system. However, it is obvious that the wired telephone system does not require a conversion circuit for converting to a radio signal and a conversion circuit for converting from a radio signal. The above is for simplifying the explanation, and it is not necessary to limit the analog telephone signal. That is, a signal obtained by converting a non-telephone signal such as an image or a facsimile into a TCM signal is also applicable, and may be a digital data signal. Due to the operation of the interface IF, the signal to enter from the private network PN1 to the private network PN2 is the private network P
The signal format used in N2, and the private network PN
The signals from 2 to PN1 are converted into the signal format used in the local area network PN1.

[0110]

As is apparent from the above description, in the two local area communication networks, it is possible to directly communicate from one side to the other side without passing through the public communication network interface. The problem of detours can be eliminated, the possibility of signal transmission quality deterioration and the occurrence of transmission delays are alleviated, and then the problem of billing (use fee) associated with the use of public communication networks disappears. Since it is possible to prevent the collision of signals, which is a problem in the communication across the premises communication networks, it is possible to smoothly operate the line.
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 when the present invention is applied to two local area communication networks.

FIG. 2 is a configuration diagram of only a wireless system of one local area communication network for explaining the principle of the present invention.

FIG. 3 is a circuit configuration diagram of a mobile wireless device for explaining the principle of the present invention.

FIG. 4 is a circuit configuration diagram of a radio base station for explaining the principle of the present invention.

FIG. 5 is a time slot structure diagram for explaining time slots used in the system of FIGS. 1 to 4;

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

FIG. 7 is a circuit configuration diagram for multiplexing a voice signal and a data signal.

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

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

FIG. 10 is a flow chart showing a flow of a calling operation of the mobile wireless device in the system according to the present invention.

11 is a flow chart showing the flow of a calling operation of the mobile wireless device in the system according to the present invention together with FIG. 10.

FIG. 12 is a flow chart showing a flow of a calling operation of the mobile wireless device in the system according to the present invention, together with FIG. 10 and FIG. 11.

13 is a circuit configuration diagram of an interface which is an important component of FIG.

FIG. 14 is a detailed circuit configuration diagram of an interface portion of FIG.

FIG. 15 is a time slot structure diagram exchanged between two local communication networks via an interface.

FIG. 16 is a flow chart showing a flow of an incoming / outgoing call operation across two local area communication networks.

FIG. 17 is a flow chart showing a flow of an incoming / outgoing call operation across two local communication networks together with FIG. 16.

FIG. 18 is a flow chart showing a flow of an incoming / outgoing call operation across two local area communication networks together with FIGS. 16 and 17;

FIG. 19 is a flow chart showing a flow of an incoming / outgoing call operation when a call collision occurs in the system according to the present invention.

FIG. 20 is a flow chart showing a flow of an incoming / outgoing call operation when a call collision occurs in the system according to the present invention, together with FIG. 19;

FIG. 21 is a flow chart showing, together with FIGS. 19 and 20, a flow of an incoming / outgoing call operation when a call collision occurs in the system according to the present invention.

22 is a flow chart showing a flow of an incoming / outgoing call operation in the case where a call collision occurs in the system according to the present invention, together with FIG. 19, FIG. 20 and FIG. 21.

[Explanation of symbols]

 10 telephone network 17 private branch exchange 20 barrier exchange 22-1 to 22-n communication signal 30 radio base station 31 signal processing unit 32 radio transmission circuit 38 signal speed restoration circuit group 39 signal selection circuit group 40 control unit 41 clock generator 42 timing Generation circuit 51 Signal speed conversion circuit group 52 Signal allocation circuit group 91 Digital encoding circuit 92 Multiplex conversion circuit 100, 100-1 to 100-n Mobile radio 101 Phone section 120 Reference crystal oscillator 121-1, 121-2 Synthesizer 122 -1,122-2 Switch 123 Transmission / reception gating controller 131 Speed conversion circuit 132 Radio transmission circuit 133 Transmission mixer 134 Transmission section 135 Radio reception circuit 136 Reception mixer 137 Reception section 138 Speed restoration circuit 141 Clock regenerator 200 Telephone 332 Signal transmission circuit 335 Signal receiving circuit 338 Signal speed restoration circuit group 339 Signal selection circuit group 340 Control unit 341 Clock regenerator 342 Timing generation circuit 351 Signal speed conversion circuit group 352 Signal allocation circuit group IF interface PN Private network

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI Technical display location H04M 7/00 A 7117-5K H04Q 3/58 103 9076-5K 7/04 A 8523-5K

Claims (1)

[Claims] 1. A first and a second, each of which includes at least one of a plurality of wired terminals and a mobile wireless terminal.
In each of the local communication network means, a signal which is time-compressed and divided into time slots of frame structure based on the respective standards is used, and the time of the frame structure from the first local communication network means is used. The original signal is decompressed by decompressing it in time into slots and decompressing the decompressed signal into a time slot having a frame structure according to the standard of the second local area network means. A compressed and delimited signal is created and transmitted to the second local communication network means, and a signal that is temporally compressed and delimited into a frame-structured time slot from the second local communication network means is also generated. And a signal that is decompressed temporally from the restored signal to a time slot having a frame structure according to the standard of the first local area network means to create a signal. A time division communication method in a private network for transmitting to the second private network means, wherein one terminal of the wired terminal and the mobile radio terminal included in the first and second private communication network means When another terminal makes a call to the terminal that is making the call, the time division communication method in the private network for performing the call processing based on a predetermined priority. .