JPH088541B2 - Multi-directional multiplex communication system - Google Patents

Description

The present invention relates to a multi-directional multiplex communication system for performing communication using a demand assignment method in which a call channel is allocated between a master station and a slave station only when a call occurs. More particularly, the present invention relates to a multi-directional multiplex communication system that enables two-way simultaneous communication among three subscribers.

(Prior Art) Conventionally, as means for connecting and accommodating terminal devices such as telephones, which are scattered geographically away from the exchange, to the exchange, the subscriber line from the exchange is once accommodated in the master station and Store the subscriber line in each slave station installed near the terminal device,
The master station and each slave station are connected via a transmission path such as a radio, and each time a call occurs in the terminal device, the terminal device in which the call originates is connected between the slave station and the master station. 2. Description of the Related Art A multi-directional multiplex communication system is used in which a communication channel is assigned to a transmission line, and a switch and a terminal device are connected to perform communication. FIG. 5 shows a configuration example of a conventional multi-directional multiplex communication system. 1
Is a switchboard, 2-1, 2-2, ... 2-9 is a first subscriber line, 3 is a master station, 4-1, 4-2 and 4-3 are slave stations, 5-
1, 5-2, ... 5-9 is the second subscriber line, 6-1 and 6
-2, ... 6-9 is a terminal device, 7-1, 7-2, 7-3
Is a transmission path between the master station and the slave station. FIG. 5 exemplifies a case where three slave stations are connected to a master station via transmission lines and three terminal devices are connected to each slave station via a second subscriber line. There is. Further, FIG. 6 is a diagram showing a conventional example of a frame structure of time division multiplex communication in a transmission line between a master station and each slave station, which is an information transmission channel of a time slot (0) and a time slot (1). To (N) (N is a positive integer).

For example, when a call occurs in the terminal device 6-1, the information transmission channel (0
The call channel allocation request information is transmitted via the (No.). The master station 3 allocates and controls a vacant communication channel from N communication channels, allocates the communication channel (No. 1) to the transmission line 7-1, and sets the communication channel allocation information to the information transmission channel (No. 0). Through the slave station 4-1
Send to. The slave station 4-1 uses the call channel (No. 1) to which the callee connection information (dial signal if the terminal device is a telephone) from the terminal device 6-1 is assigned to the master station 3
Send to. When the other party of the call is, for example, the terminal device 6-9, another vacant call channel, for example, the call channel (No. 2) is assigned in the transmission path 7-3 between the master station 3 and the slave station 4-3. , To connect the terminal device 6-1 to the terminal device 6-9, the master station 3 and the slave stations 4-1 and 4-
A call channel is allocated and secured for the transmission path between the three.

Call destination connection information is sent from the master station 3 to the exchange 1 via the first subscriber line 2-1. In the exchange 1, connection control of the communication line between the terminal devices 6-1 and 6-9 is performed. I,
The first subscriber lines 2-1 and 2-9 are connected to perform communication between the terminal devices 6-1 and 6-9.

As described above, in the multi-directional multiplex communication system,
Only when a call originates in the terminal device, a communication channel is allocated to the transmission path between the master station and the slave station to secure a communication line, and communication between the terminal devices is efficiently performed.

(Problems to be Solved by the Invention) However, in the conventional multi-directional multiplex communication system, a call channel assigned to a master-station / slave-station transmission path in response to a call request sent from one terminal device is There is only one call channel corresponding to the calling terminal device and one call channel corresponding to one callee terminal device. For this reason, two-way simultaneous call between two subscribers is possible, but two-way simultaneous call between three subscribers is not possible, and there is a drawback that it is not possible to satisfy a high level service request.

In order to solve the above problems, an object of the present invention is to allocate one call channel corresponding to a calling terminal device to a transmission path between a master station and a slave station, and to make a first call based on a three-party call request. 2 call channels corresponding to each of the callee terminal device and the second callee terminal device are also assigned, and the call information of the call channel corresponding to the first callee terminal device and the second call channel are assigned in the master station. The call information corresponding to the call terminal corresponding to the second call destination terminal device is combined with the call information corresponding to the call channel corresponding to the call destination terminal device to connect to the call channel corresponding to the call destination terminal device. First, by combining the call information of the call channel corresponding to
Connect to the call channel corresponding to the destination terminal device of
By combining the call information of the call channel corresponding to the calling terminal device and the call information of the call channel corresponding to the first callee terminal device and connecting to the call channel corresponding to the second callee terminal device An object of the present invention is to provide a multi-directional multiplex communication system that enables simultaneous two-way communication between three subscribers.

(Means for Solving the Problem) In order to achieve the above-mentioned object, the multidirectional multiplex communication system of the present invention has the following means configuration.

That is, the multi-directional multiplex communication system of the present invention includes one master station connected to the exchange through the first subscriber line and the second master station.
And one or a plurality of slave stations connected to one or a plurality of terminal devices via a subscriber line of the same and commonly used by each slave station for transmitting information between the master station and the slave stations. The master station and the slave stations are provided with a multiplexed communication signal composed of one or more information transmission channels and a plurality of communication channels assigned to the terminal device each time a call occurs by the demand assignment method. A multidirectional multiplex communication system for transmitting and receiving via a transmission path between
The master station, one or more first subscriber interface means for processing signals input to and output from the exchange via the first subscriber line; and the multiplexed communication signal transmitted by the slave station. Receiving means for receiving via the transmission path; first separating means for separating the multiplexed communication signal into a signal of the information transmission channel and a signal of the communication channel; the information transmission channel Based on the first call channel allocation request information included in the signal of No. 1, the control for assigning the first call channel corresponding to the calling terminal device is performed, and the first call channel in the call channels. Three-party call request information, second call channel allocation request information, and third signal
Based on the call channel assignment request information of the call channel assignment control, the call channel assignment control for performing control to assign the second call channel corresponding to the first callee terminal device and the third call channel corresponding to the second callee terminal device. Means for outputting first callee connection information and second callee connection information contained in the signal of the first call channel to the first subscriber interface means for input to the exchange; Person call destination connection information sending means; call channel separating means for separating call information from the signal of the call channel and outputting it to the corresponding first subscriber interface means; first call channel of the first call channel The second is for the call information, the second call information for the second call channel, and the third call information for the third call channel.
The call information and the third call information are combined to create the first combined call information, the third call information and the first call information are combined to form the second combined call information, and the first call information and the second call information are combined. Call information synthesizing means for generating third combined call information; and, the call information output from the exchange input from the first subscriber interface means is multiplexed into a signal of the corresponding call channel, and The first combined call information is the signal of the first call channel, the second combined call information is the signal of the second call channel, and the third combined call information is the signal of the third call channel. Speech channel multiplexing means for performing multiplexing processing; first multiplexing means for performing multiplexing processing on the signal of the speech channel and the signal of the information transmission channel to generate a multiplexed communication signal; the multiplexed communication signal And a first transmitting unit for transmitting the signal to the slave station via the transmission line, wherein the slave station processes a signal input to and output from the terminal device via the second subscriber line. One or a plurality of second subscriber interface means; second receiving means for receiving the multiplexed communication signal sent from the master station via the transmission path; and transmitting the multiplexed communication signal for the information transmission Second separating means for separating and processing the channel signal and the call channel signal, and separating and processing the call information from the call channel signal to the corresponding second subscriber interface means; The call information output from the terminal device, which is input from the second subscriber interface means, is multiplexed into the corresponding call channel signal, and the call channel signal and the information channel are also multiplexed. Second multiplexing means for performing a multiplexing process on the signal of the communication channel to generate a multiplexed communication signal; second transmitting means for transmitting the multiplexed communication signal to the master station through the transmission path; Based on a call signal output by the terminal device, control is performed to include the first call channel allocation request information in the signal of the information transmission channel, and based on a three-party call request signal output by the terminal device. A call channel assignment request control means for controlling to include the three-party call request information, the second call channel assignment request information, and the third call channel assignment request information in the signal of the first call channel; Control for including the first call destination connection information and the second call destination connection information in the signal of the first call channel based on the first call destination connection signal and the second call destination connection signal output by To And a three-party call destination connection request control means for performing.

(Operation) Next, the operation of the present invention configured as described above will be described.

An information transmission channel and a communication channel are provided between the master station connected to the exchange through the first subscriber line and the slave station connected to the terminal device through the second subscriber line. Communication is performed by transmitting and receiving the configured multiplexed communication signal via a transmission line between the master station and the slave station. The information transmission channel of this multiplexed communication signal is commonly used by each slave station, and the call channel is assigned to the terminal device each time a call is generated by the control of the demand assignment system.
When the terminal device makes a call, a call signal is input to the slave station via the second subscriber line. The call channel assignment request control means of the slave station includes a second multiplexing means so as to include the first call channel assignment request information in the signal of the information transmission channel and send it to the master station based on the calling signal. Control. The second multiplexing means includes the first communication channel allocation request information in the information transmission channel signal, multiplexes the information transmission channel signal and the communication channel signal, and generates a multiplexed communication signal. To the transmission means of.

The second transmitting means modulates the baseband multiplexed communication signal and transmits the high frequency multiplexed communication signal to the master station via the transmission path. The first receiving means of the master station demodulates the high frequency multiplexed communication signal received from the slave station and outputs the baseband multiplexed communication signal to the first separating means. The first separating means separates the multiplexed communication signal into an information transmission channel signal and a communication channel signal. The call channel assignment control means, based on the first call channel assignment request information included in the signal of the information transmission channel, assigns one call channel among the idle call channels to the calling terminal device. Control to assign as a call channel. Also, when the terminal device requests a three-way call,
A three-way call request signal is input to the slave station via the second subscriber line.

The call channel allocation request control means of the slave station is based on the three-party call request signal and is assigned the first and second call channel allocation request information, the second call channel allocation request information, and the third call channel allocation request information. The second multiplexing means is controlled so as to be included in the signal of the communication channel and transmitted to the master station. A multiplexed communication signal including the three-party call request information, the second call channel assignment request information, and the third call channel assignment request information in the signal of the first call channel is output from the second multiplexer, The signal of the first communication channel is separated and inputted to the first separating means via the second transmitting means, the transmission path from the slave station to the master station, and the first receiving means.

The call channel allocation control means, based on the three-party call request information, the second call channel allocation request information, and the third call channel allocation request information included in the first call channel, selects one of the available call channels. Control is performed to assign two call channels as a second call channel corresponding to the first callee terminal device and a third call channel corresponding to the second callee terminal device. Based on the allocation of the second call channel and the third call channel, the slave station prompts the terminal device requesting the three-way call to send out a callee connection signal, and requests the three-way call. The first call destination connection signal and the second output from the terminal device
The call destination connection signal is input to the slave station via the second subscriber line.

The three-party call destination connection request control means of the slave station is assigned the first call destination connection information and the second call destination connection information based on the first call destination connection signal and the second call destination connection signal. The second multiplexing means is controlled so as to be included in the signal of the first communication channel and transmitted to the master station. The multiplexed communication signal is input to the first separating means via the second multiplexing means, the second transmitting means, the transmission path from the slave station to the master station, and the first receiving means, and the first communication channel Signal is separated. The three-party call destination connection information sending means outputs the first call destination connection information and the second call destination connection information included in the signal of the first call channel to the first subscriber interface means, and The one subscriber interface means outputs the signal to the exchange via the first subscriber line. The exchange calls the first callee terminal device and the second callee terminal device. Call information from the terminal device is second
Input to the second subscriber interface means of the slave station via the subscriber line of The second subscriber interface means outputs the call information to the second multiplexing means. The second multiplexing means multiplexes the call information output from the terminal device into a corresponding call channel signal, and multiplexes the call channel signal and the information transmission channel signal to generate a multiplexed communication signal. And outputs it to the second transmitting means. The multiplexed communication signal is input to the first demultiplexing means via the second transmitting means, the transmission path from the child station to the parent station, and the first receiving means,
The information transmission channel signal and the call channel signal are separated. The call channel signal is input to the call channel separating means. The call channel separating means separates the call information from the call channel signal and outputs it to the corresponding first subscriber interface means. Further, the first call information of the first call channel, the second call information of the second call channel, and the third call information of the third call channel are input to the call information combining means. The call information synthesizing unit synthesizes the second call information and the third call information to generate first synthesized call information, and synthesizes the third call information and the first call information to generate second synthesized call information, Also, the first call information and the second call information are combined to generate third combined call information.

On the other hand, the call information from the exchange is input to the first subscriber interface means of the master station via the first subscriber line. The first subscriber interface means outputs the call information to the call channel multiplexing means. The call channel multiplexing means multiplexes the call information output from the exchange with the corresponding call channel signal, and also uses the first combined call information as the first call channel signal and the second combined call information as the second. The signal of the call channel and the third combined call information are multiplexed with the signal of the third call channel, and the signal of the call channel is output to the first multiplexing means. First
The multiplexing means of (1) multiplexes the signal of the communication channel and the signal of the information transmission channel to generate a multiplexed communication signal and outputs it to the first transmitting means. The first transmitting means modulates the baseband multiplexed communication signal and transmits the high frequency multiplexed communication signal to the slave station via the transmission path. The second receiving means of the slave station demodulates the high frequency multiplexed communication signal received from the master station and outputs the baseband multiplexed communication signal to the second separating means. The second separating means separates the multiplexed communication signal into an information transmission channel signal and a call channel signal, and separates the call information from the call channel signal to the corresponding second subscriber interface means. Output. The second subscriber interface means outputs the call information to the terminal device via the second subscriber line.

With the above operation, two-way simultaneous call between three subscribers becomes possible.

(Example) Next, the Example of this invention is described with reference to drawings.

FIG. 1 is a block diagram of a master station of a multi-directional multiplex communication system according to an embodiment of the present invention. 1 is an exchange, 2-1, 2-2, ... 2
-M is a first subscriber line corresponding to each terminal device when there are M (M is a positive integer) terminal device, 3 is a master station, 11 is a first subscriber line 2-1 , 2-2, ... and 1-M for interfacing with 2-M, 11-1, 11-2, ... 11-M are components of the first interface means 11 for making and receiving calls. A subscriber interface unit for inputting / outputting call connection information such as call termination and call information, 12 is a first transmitting / receiving means for transmitting / receiving a multiplexed communication signal to / from a slave station via a transmission path, 12-1 is a slave station Modulator that modulates the baseband multiplexed communication signal to be sent to the intermediate frequency signal (IF signal), 12-2 receives the multiplexed communication signal from the slave station and receives the baseband multiplexed communication from the IF signal A demodulation section for demodulating into a signal, 12-3 is an antenna section, and 12-4 is a high frequency version of the IF signal from the modulation section 12-1. Wave signal (RF signal) is converted to the antenna section 12-3 and the RF signal from the antenna section 12-3 is converted.
A common antenna unit for converting to an IF signal and connecting to the demodulation unit 12-2, 13 multiplexes a signal to be sent to the slave station into a predetermined signal structure corresponding to each of the information transmission channel and the communication channel, and first Of the first transmission / reception means 12 to receive the multiplexed communication signal transmitted from the slave station from the first transmission / reception means 12 and separate the signals into required signals corresponding to the information transmission channel and the communication channel. Chemical separation means, 13
-1 is a subscriber interface unit 11-1, 11-2, ...
, And 11-M, and a concentrating multiplexer / demultiplexer for multiplexing and separating call information for a call channel, 13
Reference numeral -2 is a multiplexing unit for multiplexing signals of information transmission channels such as the first call channel allocation information and outputting multiplexed communication signals having a time division multiplex communication frame structure on the transmission path to the modulation unit 12-1. -3 is a demultiplexing unit that demultiplexes the signal of the information transmission channel such as the first call channel allocation request information from the demodulated multiplexed communication signal output from the demodulation unit 12-2, and 14 is the demultiplexing unit 13-2 and the demultiplexing unit. 13-3 is connected to the control unit 13-3 to control signals of the information transmission channel and the like, and the line-concentration demultiplexing unit
13-1 control of call channel allocation and subscriber interface sections 11-1, 11-2, ... And 11
-A main control unit that performs management control of the entire system including connection control with M, 15 is a signal input from the main control unit 14, and is the first call specified by the terminal device requesting a three-way call. The destination connection information and the second call destination connection information are sent to the subscriber interface units 11-1, 11-2, ... Or 11-M.
It is a three-party call destination connection information sending unit for sending to the exchange 1 via the.

In the present embodiment, the subscriber interface units 11-1 to 11-M serve as the first subscriber interface means, the first transmitting / receiving means 12 serves as the first transmitting means and the second receiving means, and The concentrating / multiplexing / separating unit 13-1 is a speech channel multiplexing unit, a speech channel separating unit and a speech information synthesizing unit, the multiplexing unit 13-2 is a first multiplexing unit, and a separating unit.
13-3 is the first separating means, and the three-party call destination connection information sending unit
Reference numerals 15 respectively correspond to three-party call destination connection information transmitting means. Further, the main control unit 14 includes a communication channel allocation control means.

FIG. 2 is a block diagram of a slave station of the multidirectional multiplex communication system according to the embodiment of the present invention. 4-1 is a slave station, 5-1, 5-2, 5-
3 is a second subscriber line, and 6-1, 6-2 and 6-3 are slave stations 4-1 via the corresponding second subscriber lines 5-1, 5-2 and 5-3. Terminal device 16 connected to the second subscriber line 5-1, second interface means 5-2 and 5-3, and second interface means 16-1, 16-2,
16-3 is a subscriber interface unit for converting the signal speed and inputting / outputting call information, 16-4, 16-5, 16-
6 is a call information detection unit that detects call information such as call origination (off-hook), end call (on-hook), and three-party call request (for example, special number or hooking), and 17 is multiplexed communication with the master station via a transmission line. Second transmitting / receiving means for transmitting / receiving a signal, 17-1 is a modulator for modulating a baseband multiplexed communication signal to be sent to the master station into an IF signal, and 17-2 is a multiplexed communication signal from the master station. Then, a demodulation section for demodulating the IF signal into a baseband multiplexed communication signal, 17-3 is an antenna section, 17-4 is a modulation section 17-
Convert the IF signal from 1 into an RF signal and send it to the antenna section 17-3.
RF signal from antenna 17-3 is converted to IF signal and demodulator
An antenna shared unit connected to 17-2, 18 multiplexes a signal to be sent to the master station into a predetermined signal structure corresponding to each of the information transmission channel and the communication channel, and outputs the multiplexed signal to the second transmission / reception unit 17, The second multiplexing / separating means 18-1 receives the multiplexed communication signal sent from the master station from the second transmitting / receiving means 17 and separates it into required signals corresponding to the information transmission channel and the communication channel, respectively. A multiplexer that multiplexes call information for a call channel and signals of an information transmission channel such as first call channel allocation request information into a predetermined signal configuration on a transmission path and outputs a multiplexed communication signal to a modulator 17-1. , 18-2 separates the call information for the call channel from the demodulated multiplexed communication signal output from the demodulation unit 17-2 for each terminal device, and also the information transmission channel such as the first call channel allocation information. A separating unit for separating the signal of the channel, 19 is a call information detecting unit 16-4, 16-5 or 16-
6 to receive the call signal from the first call channel allocation request information via the information transmission channel, and also to receive the three-party call request signal, the first call destination connection signal and the second call destination connection signal. , The control of the multiplexing unit 18-1 so as to send the corresponding information to the master station via the first call channel assigned to the terminal device requesting the three-way call, and the separation unit 18-2. Based on the first call channel allocation information from the subscriber interface unit 16-1, 16-2 or 16-3 connected to the terminal device requesting a three-party call Control for the multiplexing unit 18-1 and the demultiplexing unit 18-2 so as to connect to the communication channel, and information from the slave station to the terminal device is sent to the subscriber interface units 16-1, 16-2 or 16-3. Control to send via Is a slave station control unit that performs the management control of only the slave station.

In this embodiment, the subscriber interface units 16-1 to 16-3 serve as the second subscriber interface means, the second transmitting / receiving means 17 serves as the second transmitting means and the second receiving means, and The multiplexing unit 18-1 corresponds to the second multiplexing unit, and the demultiplexing unit 18-2 corresponds to the second demultiplexing unit. The slave station control unit 19 includes a call channel allocation request control means and a three-party call destination connection request control means.

FIG. 3 is a diagram showing operations of a master station and a slave station in response to a three-way call request from a terminal device.

FIG. 4 is a diagram showing call channel allocation on the frame structure of time division multiplex communication on the transmission path between the master station and the slave station in the multidirectional communication system of the embodiment of the present invention. The frame structure is a time slot. Same as information transmission channel (0) and time slot (1) (N)
This is similar to the conventional frame structure shown in FIG. 6 except that it is composed of N call channels of (1). ) To (N) all three call channels, for example, call channel (I),
A call channel (No. J) and a call channel (No. K) are assigned.

Referring to FIG. 1, FIG. 2, FIG. 3 and FIG.
The operation of the multidirectional multiplex communication system according to the embodiment of the present invention will be described.

For example, when the terminal device 6-1 makes a call (off-hook), the call signal is transmitted via the second subscriber line 5-1 to the slave station 4-.
1 to the second interface means 16. Second
The interface means 16 is a subscriber interface unit
16-1, 16-2 and 16-3, and call information detector 16-4, 16-5 and 16-6,
The call signal from the terminal device 6-1 is detected by the call information detection unit 16-4 and output to the slave station control unit 19. The slave station control unit 19 that has received the calling signal requires the second demultiplexing unit 18 to send the first call channel allocation request information to the master station 3 via the information transmission channel (No. 0). It outputs and controls the signal. The second multiplexer / demultiplexer 18 is a multiplexer 18-
1 and a demultiplexing unit 18-2, and a multiplexing unit 18-
Under the control of the slave station control unit 1, reference numeral 1 is a modulation unit 17 which is a constituent element of the second transmission / reception means 17 for a multiplexed communication signal containing the first call channel allocation request information in the information transmission channel (No. 0). Output to -1. The second transmitting / receiving means 17 is a modulator
17-1, a demodulation unit 17-2, an antenna unit 17-3 and an antenna sharing unit 17-4. The baseband multiplexed communication signal input to the modulating unit 17-1 is modulated and shared by the antenna. It is transmitted to the master station 3 via the section 17-4 and the antenna section 17-3.

The multiplexed communication signal sent from the slave station 4-1 via the transmission path is received by the first transmitting / receiving means 12 of the master station 3. The first transmission / reception means 12 is composed of a modulation unit 12-1, a demodulation unit 12-2, an antenna unit 12-3 and an antenna common unit 12-4, and the antenna unit 12-3 and the antenna common unit 12-4 are connected to each other. The baseband multiplexed communication signal received and demodulated by the demodulation section 12-2 via the above is output to the first demultiplexing means 13. First
The demultiplexing and demultiplexing means 13 includes a line concentrating demultiplexing demultiplexing unit 13-1, a demultiplexing unit 13-2, and a demultiplexing unit 13-3.
Reference numeral 13-3 denotes the first call channel allocation request information sent from the slave station 4-1 via the information transmission channel (No. 0) after demultiplexing the multiplexed communication signal input from the demodulation unit 12-2. Is output to the main control unit 14.

At this time, if at least one of the call channels (number 1) to the same (number N) is vacant, the main control unit 14 allocates the first call channel, for example, the call channel (number I). , And outputs the first call channel allocation information to the multiplexing unit 13-2, puts it on the information transmission channel (No. 0), and transmits the multiplexed communication signal to the modulation unit 12-1 and the antenna shared unit 12-4. And it transmits to the slave station 4-1 via the antenna section 12-3. Master station 3 via transmission line
The multiplex communication signal sent from the slave station 4-1 is received by the second transmitting / receiving means 17 of the slave station 4-1. The multiplexed communication signal received and demodulated via the antenna section 17-3, the antenna common section 17-4 and the demodulation section 17-2 is separated by the separation section 18-2 and is processed into the information transmission channel (No. 0). The included first call channel allocation information is input to the slave station control unit 19. The slave station control unit 19 of the slave station 4-1 which has received the first call channel allocation information causes the calling terminal device 6-1 to send the second subscriber line 5-.
Subscriber interface unit 16-connected via 1
The second demultiplexing means 18 is controlled so as to connect 1 to the assigned first communication channel (No. I). That is, the signal of the first communication channel (No. I) in the multiplexing unit 18-1 and the demultiplexing unit 18-2 is input / output to / from the terminal device 6-1 via the subscriber interface unit 16-1.

In addition, the slave station control unit 19 which has received the first call channel allocation information, the subscriber interface unit 16-1 and the second
The first dial tone is transmitted to the terminal device 6-1 via the subscriber line 5-1 of FIG. 1 to notify the subscriber that the call channel has been assigned. In this state, the subscriber who requests the three-way call makes a three-way call request by a special number or hooking. Via the call information detector 16-4, the three-party call request signal, the second call channel assignment request information, and the third call channel assignment request information are assigned via the first call channel (No. I). Then, the multiplexing unit 18-1 is controlled so as to be transmitted to the master station 3. Via the second transmission / reception means 17 of the slave station 4-1 and the transmission path from the slave station 4-1 to the master station 3 and the first transmission / reception means 12 and the first demultiplexing means 13 of the master station 3. After receiving the three-party call request information, the second call channel allocation request information, and the third call channel allocation request information, the main control unit 14 receives the call channel (No. 1).
If two more call channels of the same (N) are available, the second call channel, for example, call channel (J) and the third call channel, for example, call channel (K) are assigned. A multiplexing unit for the second call channel assignment information and the third call channel assignment information
Output to 13-2. The multiplexing unit 13-2 multiplexes the second call channel assignment information and the third call channel assignment information so as to send them to the slave station via the first call channel (No. I).

Further, the main controller 14 instructs the concentrator multiplexer / demultiplexer 13-1 to use the first call channel (I
No.), the second call channel (No. J), and the third call channel (No. K) are controlled to be separately processed. The concentrator multiplexer / demultiplexer 13-1 combines the second call information of the second call channel (No. J) and the third call information of the third call channel (No. K) to obtain the first combined call information. Generated and connected to the first call channel (No. I) in the downstream frame structure, and the third call information of the third call channel (K number) and the first call information of the first call channel (No. I) To generate the second combined call information and connect it to the second call channel (No. J) in the downlink frame structure, and the first call information and the second call channel of the first call channel (No. I). The second call information (No. J) is combined with the second call information (No. K) to generate downlink third combined call information, and the downlink third combined call information is connected and multiplexed.

The second call channel allocation information and the third call channel allocation information are the first demultiplexing means 13 and the first transmitting / receiving means 12 of the master station and the transmission path from the master station 3 to the slave station 4-1. It is input to the slave station control unit 19 via the second transmitting / receiving means 17 and the second demultiplexing means 18 of the slave station 4-1. Upon receiving the second call channel allocation information, the slave station control unit 19
Subscriber interface section 16-1 and second subscriber line 5
The second dial tone is sent to the terminal device 6-1 via -1 to prompt the subscriber to dial the first call destination. The dial signal, which is the first call destination connection information from the subscriber, is input to the slave station control unit 19 via the call information detection unit 16-4, and the slave station control unit 19 outputs the first call destination connection information. The multiplexing unit 18-1 is controlled so as to be transmitted to the master station 3 via the already assigned first call channel (No. I), and the third unit is provided to the subscriber interface unit 16-1.
Controls the transmission of dial tone of. The subscriber interface unit 16-1 sends a third dial tone to the terminal device 6-1 to prompt the subscriber to dial the second call destination.

Hereinafter, the second call destination connection information is also sent to the master station 3 via the first call channel (No. I) through the same route as the first call destination connection information.

The first call destination connection information and the second call destination connection information sent from the slave station 4-1 via the first call channel (No. I) are input to the main control unit 14 of the master station 3 and The control unit 14 outputs the call destination connection information (dial signal) to the three-party call destination connection information sending unit 15. The three-party call destination connection information sending unit 15 sends the call destination connection information (dial signal) to the exchange 1 via the subscriber interface unit 11-1. The exchange 1 calls the first callee terminal device and the second callee terminal device and sends a ringing tone to the terminal device 6-1.

On the other hand, the first callee terminal device and the second callee that received the call
In the slave station to which the callee terminal device belongs, the same call channel connection as that of the terminal device 6-1 which has made the three-party call request is made by the incoming call information and the three-party call request information sent from the master station.

(Effects of the Invention) As described above, in the multi-directional multiplex communication system of the present invention, the first call channel corresponding to the calling terminal device is assigned and the first call channel is sent in response to the three-party call request. Second call channel and third call channel corresponding to each of the callee terminal device and the second callee terminal device, that is, three call channel assignments are made and transmission between the master station and the slave station is performed. Secure a communication line on the street,
In the master station, the call information of the second call channel and the third call information
And the call information of the call channel of No. 3 are combined and connected to the first call channel, and the call information of the third call channel and the call information of the first call channel are combined and connected to the second call channel. A third call by combining call information of the first call channel and call information of the second call channel.
By connecting to the call channel of, the two-way simultaneous call among the three subscribers can be performed, and there is an effect that it is possible to satisfy a high level service request.

[Brief description of drawings]

FIG. 1 is a block diagram of a master station of a multidirectional multiplex communication system of an embodiment of the present invention, FIG. 2 is a block diagram of a slave station of a multidirectional multiplex communication system of an embodiment of the present invention, and FIG. FIG. 4 is an operation diagram of a master station / slave station in response to a person call request, FIG. 4 is a call channel allocation diagram on a frame configuration of time division multiplex communication in an embodiment of the present invention, and FIG. 5 is a configuration diagram of a conventional multidirectional multiplex communication system, FIG. 6 is a frame configuration diagram of conventional time division multiplex communication. 1 ... Switch, 2-1,2-2, to 2-9 ... First subscriber line, 3 ... Parent station, 4-1,4-2,4-3 ... Slave station, 5- 1,5
-2, ~ 5-9 ... second subscriber line, 6-1, 6-2, ~ 6-
9 ... Terminal device, 7-1, 7-2, 7-3 ... Transmission line, 11 ...
First interface means 11-1, 11-2, to 11-M ...
... subscriber interface section, 12 ... first transmitting / receiving means, 12-1, modulation section, 12-2 ... demodulation section, 12-3 ...
Antenna part, 12-4 ... Antenna common part, 13 ... First demultiplexing means, 13-1 ... Concentrating line demultiplexing part, 13-2.
Multiplexing unit, 13-3 ... Separation unit, 14 ... Main control unit, 15 ...
Three-party call destination connection information sending unit, 16 ... Second interface means, 16-1,16-2,16-3 ... Subscriber interface unit, 16-4,16-5,16-6 ... Call Information detector, 17 ……
2nd transmission / reception means, 17-1 ... Modulation section, 17-2 ... Demodulation section, 17-3 ... Antenna section, 17-4 ... Antenna section, 18
...... Second demultiplexing / separating means, 18-1 ...... Multiplexing unit, 18-
2 ... Separation section, 19 ... Slave station control section.

Claims (1)

[Claims] 1. A master station connected to a switchboard via a first subscriber line, and one or a plurality of terminal stations connected to one or more terminal devices via a second subscriber line. A call is originated to the terminal device by one or more information transmission channels, which are composed of a slave station and are commonly used by each slave station for information transmission between the master station and the slave station, and a demand assignment method. In a multi-directional multiplex communication system for transmitting and receiving a multiplexed communication signal composed of a plurality of communication channels allocated for each communication via a transmission line between the master station and the slave station, the master station And one or more first subscriber interface means for processing signals to and from the exchange via the first subscriber line; and the transmission of the multiplexed communication signal sent by the slave station. First to receive over the road Receiving means; first separating means for separating the multiplexed communication signal into a signal of the information transmission channel and a signal of the communication channel; a first communication channel included in the signal of the information transmission channel The first corresponding to the calling terminal device based on the allocation request information
Control for allocating the other communication channels, and the three-party call request information, the second call channel allocation request information, and the third call channel allocation included in the signal of the first call channel among the call channels. Call channel allocation control means for controlling, based on request information, a second call channel corresponding to the first callee terminal device and a third call channel corresponding to the second callee terminal device; A three-party call destination connection for outputting the first call destination connection information and the second call destination connection information contained in the signal of the first call channel to the first subscriber interface means for inputting to the exchange. Information transmission means; a call channel that separates call information from the call channel signal and outputs it to the corresponding first subscriber interface means Second call information for the first call information of the first call channel, the second call information of the second call channel, and the third call information of the third call channel. The third call information is combined to form the first combined call information, the third call information and the first call information are combined to form the second combined call information, and the first call information and the second
Call information synthesizing means for synthesizing call information to generate third synthesized call information; multiplexing processing of call information output from the exchange input from the first subscriber interface means to a corresponding signal of the call channel And also the first
The composite call information is multiplexed with the signal of the first call channel, the second composite call information with the signal of the second call channel, and the third composite call information with the signal of the third call channel. Speech channel multiplexing means for processing; first multiplexing means for multiplexing the speech channel signal and the information transmission channel signal to generate a multiplexed communication signal; A first transmitting means for transmitting to the slave station via a transmission line; wherein the slave station processes a signal input / output to / from the terminal device via the second subscriber line Or a plurality of second subscriber interface means; second receiving means for receiving the multiplexed communication signal transmitted from the master station via the transmission path; and the multiplexed communication signal of the information transmission channel Signal and Second separating means for separating and processing into a signal of the call channel, and separating and processing call information from the signal of the call channel and outputting to the corresponding second subscriber interface means; Communication information output from the terminal device input from the user interface means is multiplexed into the corresponding communication channel signal, and the communication channel signal and the information channel signal are multiplexed to perform multiplexed communication. Second multiplexing means for generating a signal; second transmitting means for transmitting the multiplexed communication signal to the master station via the transmission path; based on a calling signal output from the terminal device, The control for including the first call channel allocation request information in the signal of the information transmission channel is performed, and based on the three-party call request signal output from the terminal device, three parties Talk request information and the second
Communication channel allocation request control means for controlling to include the communication channel allocation request information and the third communication channel allocation request information in the signal of the first communication channel;
A first call destination connection signal and a second call destination connection signal output from the terminal device.
A three-party call destination connection request control means for performing control to include the first call destination connection information and the second call destination connection information in the signal of the first call channel based on the call destination connection signal of. A multi-directional multiplex communication system comprising: