JP2006025357A - Two-way communication relay system, repeater, and two-way communication relay method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a two-way communication relay system for repeating signals of a two-way communication system in which a frequency of an uplink channel from a terminal to a center device and a frequency of a downlink channel from the center device to the terminal are multiplexed in a time dividing manner at the same frequency. <P>SOLUTION: There are provided a first communication network 3 including a plurality of terminals 2a-2n; a second communication network 5 including a plurality of other terminals 4a-4m; a center device 1 which is connected to the first communication network 3 and realizes control of communication allocation to the terminals 2a-2n and communication between the terminals; and a repeater which is connected to the first communication network 3 as one terminal, is also connected to the second communication terminal 5 and includes a second memory 71 storing a second destination table having destination information of the terminals 4a-4m, and a control section for relaying and transmission signals between the center device 1 and the terminals 4a-4m while controlling the communication allocation to the terminals 4a-4m. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a bidirectional communication relay system, a repeater, and a bidirectional communication relay method for relaying signals transmitted and received in a bidirectional communication system. For example, the present invention relates to a bidirectional communication relay system, a repeater, and a bidirectional communication relay method for relaying signals of the same frequency, time division multiplexed bidirectional communication system.

  A method of relaying a bidirectional communication system and another bidirectional communication system has been devised (see, for example, Patent Document 1).

  Hereinafter, an example of a conventional bidirectional communication relay system will be described with reference to the drawings.

  FIG. 8 shows the structure of a conventional bidirectional communication relay system.

  A gateway 45 is installed at a portion where the network 41 belonging to the center apparatus 42 and the network 43 belonging to the center apparatus 44 are in contact.

  FIG. 9 is a frequency array diagram assigned for communication in the relay system for bidirectional communication shown in FIG. 51a is an uplink control channel, 51b is a downlink control channel, 52a, 53a... Are uplink communication channels, and 52b, 53b.

  The operation of the conventional bidirectional communication relay system configured as described above will be described below.

  When the terminal 46 belonging to the network 43 communicates with the terminal 47 belonging to the network 41, the terminal 46 first notifies the center device 44 that the communication is to the terminal 47 belonging to the network 41 through the control channel 51a. . Then, the center device 44 informs the gateway 45 of the unused communication channel number, the number of the calling terminal, and the desired terminal number via the control channel 51b. The gateway 45 further relays this information to the center device 42 through the control channel 51a.

  Next, the center apparatus 42 notifies the terminal 47 and the gateway 45 that the communication channels 52a-52b pair and 53a-53b pair are allocated by the control channel 51b. The gateway 45 communicates this information to the center device 44 through the control channel 51a, and the center device 44 informs the terminal 46 through the control channel 51b that the communication channels 52a-52b pair and 53a-53b pair are allocated.

  Thereafter, communication from the terminal 46 to the terminal 47 is transmitted between the terminal 46 and the center apparatus 44 through the communication channel 52 a, and further frequency-converted by the center apparatus 44, and the communication between the center apparatus 44 and the gateway 45 is performed. The time is transmitted through the communication channel 52b. Further, the frequency is converted by the gateway 45 and transmitted between the gateway 45 and the center device 42 through the communication channel 52a. Further, the frequency is converted by the center device 42 and transmitted between the center device 42 and the terminal 47 through the communication channel 52b.

  Similarly, the communication from the terminal 47 to the terminal 46 is transmitted between the terminal 47 and the center apparatus 42 via the communication channel 53a, and further frequency-converted by the center apparatus 42, and the communication between the center apparatus 42 and the gateway 45 is performed. The communication is transmitted through the communication channel 53b. Further, the frequency is converted by the gateway 45 and transmitted between the gateway 45 and the center device 44 through the communication channel 53a. Further, the frequency is converted by the center device 44 and transmitted between the center device 44 and the terminal 46 through the communication channel 53b.

In this way, inter-terminal communication with terminals belonging to other networks is realized in the bidirectional communication network.
Japanese Patent Publication No. 7-95748

  However, the above-described conventional two-way communication relay system is based on the premise that the networks including the center device are relayed, and cannot be relayed to a network that does not include the center device.

  The present invention solves the above-described conventional problems, and provides a bidirectional communication relay system, a repeater, and a bidirectional communication relay method that can be relayed to a network that does not include a center device.

In order to solve the above-described problem, the first aspect of the present invention provides:
A first communication network having a plurality of terminals;
A second communication network having at least one other plurality of terminals;
A first memory connected to the first communication network and storing a first destination table having destination information of the plurality of terminals and the other plurality of terminals; and the plurality of the plurality of terminals belonging to the first communication network A center apparatus having a center control unit that controls communication allocation of the terminals and performs communication between the terminals,
A second destination table connected to the first communication network as one terminal, connected to the second communication network, and having destination information of at least the other terminals belonging to the second communication network And the communication allocation of the plurality of other terminals is extracted, and the information addressed to any one of the plurality of other terminals is extracted from the communication information transmitted from the center apparatus. The information transmitted to the destination terminal and from the information received from any one of the plurality of other terminals, information destined for any other terminal of the other plurality of terminals is extracted and A relay unit having a relay control unit that transmits to a destination terminal and transmits information other than that addressed to any other terminal to the center device,
The first memory is a bidirectional communication relay system in which combination information of the second communication network and the repeater is also stored.

The second aspect of the present invention
The first communication network and the second communication network are networks that perform time division communication in the same frequency band,
The center device performs time allocation of communication with a plurality of terminals belonging to the first communication network and with the repeater,
The relay control unit of the repeater, based on the time allocation of the communication sent from the center device, the time not allocated by the center device to a plurality of other plurality of belonging to the second communication network It is the relay system for bidirectional communication according to the first aspect of the present invention, which is allocated to the time for communication with each terminal.

The third aspect of the present invention provides
The relay control unit has a communication data memory for holding communication data,
The information addressed to any one of the other terminals received from the center device is extracted and held in the memory for communication data, and at the time allocated for communication with the destination terminal, Send the information to the destination terminal,
Information received from any one of the other plurality of terminals is held in the communication data memory, out of the held information, information addressed to any other terminal of the other plurality of terminals, The information transmitted to the destination terminal at the time allocated for communication with the destination terminal, and information other than that addressed to any other terminal is transmitted to the center apparatus allocated by the center apparatus. It is the relay system for bidirectional communication according to the second aspect of the present invention, which transmits to the center device at the time for communication between the two.

The fourth invention relates to
The center device also transmits a broadcast signal using a frequency band different from the frequency band used for communication with each of a plurality of terminals belonging to the first communication network,
The repeater includes a first connection point connected to the first communication network, a second connection point connected to the second communication network, the first connection point, and the second connection point. Having a connection line connecting the connection points,
The relay control unit is a relay system for bidirectional communication according to a second aspect of the present invention, which is connected to each of the first connection point and the second connection point.

The fifth aspect of the present invention relates to
The repeater is
A first filter that filters a signal of communication data transmitted from the center device between the relay control unit and the first connection point;
A second filter for filtering communication data signals transmitted from a plurality of other terminals belonging to the second communication network between the relay control unit and the second connection point; The relay system for bidirectional communication according to the fourth aspect of the present invention.

The sixth invention relates to
The repeater is the relay system for bidirectional communication according to the fifth aspect of the present invention, further comprising a third filter for filtering the broadcast signal in the middle of the connection line.

The seventh invention relates to
The repeater further includes:
A signal that is arranged between the relay control unit and the first filter and that has been transmitted from the center device that has been filtered by the first filter is demodulated, and is also filtered by the first filter. A first modulation / demodulation unit that modulates a signal to be transmitted to the center device;
It is arranged between the relay control unit and the second filter, and transmitted from any one of the plurality of other terminals belonging to the second communication network filtered by the second filter. A second modulation / demodulation unit that modulates a signal to be transmitted to any one of the other plurality of terminals to be demodulated and to be filtered by the second filter. It is a bidirectional communication relay system of the present invention.

The eighth invention relates to
The frequency of the signal transmitted from the center device to the repeater is different from the frequency of the signal transmitted from the repeater to the center device,
Further, the frequency of a signal transmitted from any one of the plurality of other terminals belonging to the second communication network to the repeater, and any one of the other plurality of terminals from the repeater 2 is a relay system for bidirectional communication according to the second aspect of the present invention, wherein the frequency of a signal to be transmitted is different.

The ninth invention relates to
The first communication network and the second communication network are the relay systems for bidirectional communication according to the first aspect of the present invention, in which each terminal is connected by a coaxial cable and a distributor.

The tenth aspect of the present invention is
A repeater used in the relay system for bidirectional communication according to the first aspect of the present invention,
The relay control unit that is connected to the first communication network as one terminal, is also connected to the second communication network, and controls communication allocation of the plurality of other terminals belonging to the second communication network. It is a repeater.

The eleventh aspect of the present invention is
Connected to a first communication network having a plurality of terminals and a second communication network having at least one other plurality of terminals, and destinations of the plurality of other terminals belonging to at least the second communication network Using a repeater having a memory storing a second destination table with information,
Controlling communication allocation of the other plurality of terminals belonging to the second communication network;
From the communication information sent from the center apparatus that controls communication allocation of the plurality of terminals connected to the first communication network and belongs to the first communication network and performs communication between the terminals. Extracting information addressed to any one of the plurality of other terminals belonging to the communication network 2 and transmitting the information to the destination terminal;
Out of information received from any one of the other plurality of terminals belonging to the second communication network, information destined for any other terminal of the other plurality of terminals is extracted and the destination terminal Sending to
A step of transmitting information other than one addressed to any other terminal among the plurality of other terminals from the information received from any one of the other terminals to the center device. This is a communication relay method.

The twelfth aspect of the present invention is
The center device of the first aspect of the present invention,
A program for causing a computer to function as a center control unit that controls communication assignment of the plurality of terminals belonging to the first communication network and performs communication between the terminals.

The thirteenth aspect of the present invention is
A recording medium carrying the program of the twelfth aspect of the present invention, which is a recording medium usable by a computer.

The fourteenth aspect of the present invention is
Of the repeater of the first aspect of the present invention,
Control communication allocation of the other terminals, extract information addressed to any one of the other terminals from the communication information sent from the center device, and transmit the information to the destination terminal; Further, out of information received from any one of the other plurality of terminals, information destined for any other terminal of the other plurality of terminals is extracted and transmitted to the destination terminal. A program for causing a computer to function as the relay control unit, which transmits information other than that addressed to any of the terminals to the center device.

The fifteenth aspect of the present invention is
A recording medium carrying the program of the fourteenth aspect of the present invention, which is a recording medium usable by a computer.

  According to the present invention, it is possible to provide a bidirectional communication relay system, a repeater, and a bidirectional communication relay method capable of relaying signals of a time division multiplexing bidirectional communication system using the same frequency in the uplink and downlink.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 shows a configuration of a bidirectional communication relay system according to Embodiment 1 of the present invention.

  The bidirectional communication relay system according to the first embodiment is connected to the network 3 connected to the center apparatus 1, the network 5 and the network 81 having no center apparatus, and the network 3 and the network 5. A relay 6 that relays the network, and a relay 80 that is connected to the network 3 and the network 81 and relays these networks are configured. As described above, the bidirectional communication relay system according to the first embodiment is characterized by relaying to a network such as the network 5 or the network 81 that does not include the center device.

  The repeater 80 has the same configuration as the repeater 6, and the network 81 has the same configuration as the network 5. Therefore, the operations in the repeater 80 and the network 81 are the same as the operations in the repeater 6 and the network 5. Hereinafter, the repeater 6 and the network 5 will be described.

  The network 3 is an example of the first communication network of the present invention, and the networks 5 and 81 are both examples of the second communication network of the present invention.

  Both the network 3 and the network 5 are networks in which communication is performed by time division multiplexing in which communication is performed using the same frequency band.

  The network 3 accommodates a plurality of terminals 2a to 2n, and the network 5 accommodates a plurality of terminals 4a to 4m.

  The center device 1 includes a center device control unit 75 and an all destination table 70. The all destination table 70 includes destination information of all terminals, that is, a plurality of terminals 2 a to 2 n accommodated in the network 3 and a plurality of terminals 4 a to 4 m accommodated in the network 5. Further, the all destination table 70 includes combination information indicating the relation between the repeater and the terminal, such as which terminal belongs to the network connected to which repeater (in the case of FIG. 1, “terminals 4a to 4m are , “Belonging to the network 5 managed by the repeater 6”. Then, the center device control unit 75 allocates communication time in each of the terminals 2a to 2n accommodated in the network 3 based on the all destination table 70, and communicates with each of the terminals 2a to 2n. By interposing between 2a to 2n, communication between the terminals 2a to 2n is realized.

  The all destination table 70 is an example of a first memory in which the first destination table of the present invention is stored. The center device control unit 75 is an example of the center control unit of the present invention.

  The repeater 6 includes a first filter 11, a first modulation / demodulation unit 12, a second filter 13, a second modulation / demodulation unit 14, a third filter 15, a control unit 16, a repeater destination table 71, a communication A data memory 74 is provided. The repeater destination table 71 includes destination information of a plurality of terminals 4 a to 4 m accommodated in the network 5.

  The repeater destination table 71 is an example of a second memory in which the second destination table of the present invention is stored. The control unit 16 is an example of the relay control unit of the present invention.

  The repeater 6 is connected to the network 3 through a first connection terminal 72 and is connected to the network 5 through a second connection terminal 73. The third filter 15 and the first filter 11 are connected to the first connection terminal 72, and the other end of the third filter 15 and the second filter 13 are connected to the second connection terminal 73. It is connected. As shown in FIG. 1, the network 3 and the network 5 are connected inside the repeater 6 via the third filter 15.

  The first connection terminal 72 and the second connection terminal 73 are examples of the first connection point and the second connection point of the present invention, respectively. A wiring portion where the first connection terminal 72 and the second connection terminal 73 are connected via the third filter 15 is an example of the connection line of the present invention.

  FIG. 2 is a frequency array diagram assigned for communication in the bidirectional communication relay system according to the first embodiment. For communication between terminals, a frequency band 21 for communication channels for upper and lower lines different from the frequency band 22 for broadcast channels is used.

  The operation of the relay system for bidirectional communication according to the first embodiment configured as described above will be described below with reference to FIGS.

  First, the case where the center apparatus 1 and the terminals 2a to 2n accommodated in the network 3 perform communication will be described. The terminals 2a to 2n communicate with the center apparatus 1 using the up / down line communication channel 21. The transmission timing of uplink signals from the terminals 2a to 2n to the center apparatus 1 is controlled by the center apparatus 1 so that data collision does not occur. Here, the center apparatus 1 is controlling so that a data collision does not arise by allocating the time which communicates for each terminal 2a-2n.

  Further, downlink signals from the center apparatus 1 to the terminals 2a to 2n are transmitted by broadcast from the center apparatus 1. And when communicating between terminals 2a-2n, communication is performed via the center apparatus 1. FIG.

  Next, a case where the terminals 2a to 2n accommodated in the network 3 communicate with the terminals 4a to 4m accommodated in the network 5 will be described.

  The terminals 2a to 2n communicate with the repeater 6 through the center device 1 using the communication channel 21 for the up / down line. The transmission timing of the uplink signal from the repeater 6 to the center apparatus 1 is controlled by the center apparatus 1 so that no data collision occurs as in the terminals 2a to 2n included in the network 3. A downstream signal from the center apparatus 1 to the repeater 6 is transmitted from the center apparatus 1 by broadcast. That is, in this case, the repeater 6 operates as one terminal accommodated in the network 3 with respect to the center device 1.

  The repeater 6 uses the first filter 11 connected to the first connection terminal 72 connected to the network 3 to filter and select the communication channel 21 for the up / down line, and the first modulation / demodulation unit 12 performs the center selection. The signal received from the apparatus 1 is demodulated.

  Then, the control unit 16 analyzes the destination of the demodulated data output from the first modem unit 12 based on the information in the relay destination table 71. When the destination is the terminal 4 a to 4 m accommodated in the network 5, the data is transferred to the second modem unit 14. The second modulation / demodulation unit 14 modulates the transferred data, filters the uplink / downlink communication channel 21 by the second filter 13, and is accommodated in the network 5 connected to the second connection terminal 73. Transmit to terminals 4a-4m. Downlink signals from the repeater 6 to the terminals 4a to 4m are transmitted from the repeater 6 by broadcast.

  On the other hand, the transmission timing of the uplink signal from the terminals 4a to 4m accommodated in the network 5 to the repeater 6 is controlled by the repeater 6 so that no data collision occurs. The repeater 6 performs control so that data collision does not occur by assigning a transmission time to the repeater 6 for each of the terminals 4a to 4m.

  The repeater 6 uses the second filter 13 connected to the second connection terminal 73 connected to the network 5 to filter and select the communication channel 21 for the up / down line, and the second modem unit 14 selects the network 5. Demodulate the signals received from the terminals 4a to 4m accommodated therein.

  Then, the control unit 16 analyzes the destination of the demodulated data output from the second modem unit 14 based on the information in the relay destination table 71.

  When the destination analyzed by the control unit 16 is the terminals 4 a to 4 m included in the network 5, the received data is stored in the communication data memory 74. The control unit 16 then transfers the stored data to the second modulation / demodulation unit 14 after the data reception is completed. The second modulation / demodulation unit 14 modulates the transferred data, filters the uplink / downlink communication channel 21 by the second filter 13, and transmits it to any one of the destination terminals 4a to 4m. Thus, for communication between the terminals 4 a to 4 m accommodated in the network 5, the repeater 6 does not transfer the communication data to the center device 1, and does not transfer between the terminals via the repeater 6. Make communication. That is, the repeater 6 operates as a center device for communication between the terminals 4 a to 4 m accommodated in the network 5.

  When the destination analyzed by the control unit 16 is other than the terminals 4 a to 4 m included in the network 5, the data is transferred to the first modem unit 12. The first modulation / demodulation unit 12 modulates the transferred data, filters the uplink / downlink communication channel 21 by the first filter 11, and transmits it to the center device 1. Here, the control unit 16 performs control so that the timing at which the first modem unit 12 transmits a signal to the network 3 and the timing at which the second modem unit 14 transmits a signal to the network 5 do not overlap each other. Since the transmission timing from the repeater 6 to the center device 1 is determined by the center device, the control unit 16 assigns the transmission time from the terminals 4a to 4m to the repeater 6 so as not to overlap the transmission time. To control.

  Next, the operation of the third filter 15 of the repeater 6 will be described.

  The third filter 15 connects the network 3 and the network 5 to each other, filters the broadcast channel 22, and the signal of the broadcast channel 22 transmitted from the center device 1 is sent to the terminals 2 a to 2 n accommodated in the network 3. In addition, it is provided so as to be transmitted to the terminals 4a to 4m accommodated in the network 5. All terminals in the network 3 and the network 5 can receive the broadcast channel 22 transmitted from the center apparatus 1 by broadcast.

  By providing the third filter 15, it is possible to reduce mutual signal interference even when the transmission / reception timings of the first modulation / demodulation unit 12 and the second modulation / demodulation unit 14 overlap. Furthermore, by making the characteristics of the third filter 15 close to ideal, it is possible to overlap these transmission / reception timings.

  Next, the communication timing between the devices in the bidirectional communication relay system according to the first embodiment will be described.

  FIG. 3 shows the relationship of the communication time zones between the devices in the bidirectional communication relay system of the first embodiment.

25 is the time zone of the upstream signal from the terminals 2a to 2n to the center device 1, 26 is the time zone of the downstream signal from the center device 1 to the terminals 2a to 2n, and 27 is the relay device 6 to the terminals 4a to 4m. , The time zone of the upstream signal from the terminals 4a to 4m to the repeater 6, and the time zone of the upstream signal from the repeater 6 to the center device 1 are shown. FIG.
As shown in FIG. 4, the time zones 25 to 29 are controlled so as not to overlap each other so as not to cause a collision of each communication.

  Of these communication time zones, the time zones 25, 26, and 29 are assigned by the center apparatus 1. Then, the information of these time zones allocated by the center apparatus 1 is transmitted to the repeater 6, and the repeaters 6 27 and 28 are not overlapped with the 25, 26, and 29 time zones based on the information. Allocate a time zone. In this way, control is performed so that communication times between the devices do not overlap.

  Next, an example of processing of transmission destination information in the header part for realizing communication between devices in the bidirectional communication relay system according to the first embodiment will be described.

  FIG. 4 shows transmission destination information in the header part in communication between devices in the bidirectional communication relay system of the first embodiment.

  4 (1) shows the destination information of the header part in the communication between the terminal 2a and the terminal 2n belonging to the network 3, and (2) shows the destination of the header part in the communication between the terminal 2a and the terminal 4a belonging to the network 5. (3) shows the destination information of the header part in the communication between the terminal 4a and the terminal 4m belonging to the network 5, respectively.

  The transmission data includes “final destination information” that is finally transmitted, in addition to the transmission destination information in the header portion. This “final destination information” may be included in the header portion, or may be included in a portion other than the header portion of the transmission data. The control unit 16 of the center device 1 and the repeater 6 rewrites and transfers the transmission destination information in the header part according to the content of the “final destination information”, and finally transmits it to the device of the “final destination information”. Transmit data.

  When transmitting transmission data between the terminal 2a and the terminal 2n belonging to the network 3, as shown in (1) of FIG. 4, the terminal 2a first sets “terminal 2n” in “final destination information”. The transmission data is transmitted to the center device 1 with the transmission destination of the header portion as the “center device”. Since the “final destination information” is “terminal 2n”, the center device 1 that has received this transmission data from the terminal 2a changes the transmission destination of the header part to “terminal 2n” and transmits the transmission data to the terminal 2n. To do. Similarly, when transmitting transmission data from the terminal 2n to the terminal 2a, the transmission data is transmitted via the center device 1 in the same manner.

  In the case where transmission data is communicated between the terminal 2a belonging to the network 3 and the terminal 4a belonging to the network 5, as shown in (2) of FIG. 4, first, the terminal 2a displays “terminal 4a” in the “final destination information”. ”Is set, the transmission destination of the header is set to“ center device ”, and the transmission data is transmitted to the center device 1. Since the “final destination information” is “terminal 4a”, the center device 1 that has received this transmission data from the terminal 2a changes the transmission destination of the header part to “relay” and transfers the transmission data to the repeater 6. Forward. The repeater 6 that has received the transmission data transferred from the center device 1 changes the transmission destination of the header part to “terminal 4a” and changes the transmission data because the “final destination information” is “terminal 4a”. It transmits to the terminal 4a.

  Conversely, when transmitting transmission data from the terminal 4a belonging to the network 5 to the terminal 2a belonging to the network 3, the terminal 4a first sets “terminal 2a” in the “final destination information” and transmits the header part. The transmission data is transmitted to the repeater 6 with the destination as the “repeater”. The repeater 6 that has received this transmission data from the terminal 4a changes the transmission destination of the header part to “center device” and transmits the transmission data to the center device 1 because the “final destination information” is “terminal 2a”. Forward. The center device 1 that has received the transmission data transferred from the repeater 6 changes the transmission destination of the header part to “terminal 2a” because the “final destination information” is “terminal 2a”, and transmits the transmission data. It transmits to the terminal 2a.

  When transmitting transmission data between the terminal 4a and the terminal 4m belonging to the network 5, as shown in (3) of FIG. 4, first, the terminal 4a sets “terminal 4m” in “final destination information”. The transmission data is transmitted to the repeater 6 by setting the transmission destination of the header part as “relay”. The repeater 6 that has received this transmission data from the terminal 4a changes the transmission destination of the header part to “terminal 4m” and transmits the transmission data to the terminal 4m because the “final destination information” is “terminal 4m”. To do. Similarly, when transmitting transmission data from the terminal 4m to the terminal 4a, the transmission data is also transmitted via the repeater 6. As described above, regarding communication between terminals belonging to the network 5, the transmission data is not transmitted to the center apparatus 1 but is transferred by being returned by the repeater 6. That is, in this case, the repeater 6 plays a role of transmission control as a center device.

  The above-described method in which the center device 1 and the repeater 6 rewrite and transfer the transmission destination information in the header part is an example of the processing method of the bidirectional communication relay system according to the first embodiment, and other methods. It may be realized with.

  As described above, the bidirectional communication relay system according to the first embodiment accommodates the center device 1, the network 3 accommodating the plurality of terminals 2a to 2n, and the plurality of terminals 4a to 4m. The other network 5 and the repeater 6 which connects the network 3 and the network 5 are provided. The repeater 6 includes a first filter 11 for filtering the signal of the network 3, a first modulation / demodulation unit 12 for modulating / demodulating the signal extracted by the first filter 11, and a signal of the network 5. A second filter 13 for wave generation, a second modulation / demodulation unit 14 for modulating / demodulating the signal extracted by the second filter 13, a third filter 15 for connecting the network 3 and the network 5 to each other, and a first modulation / demodulation The control part 16 which processes the data input / output to the part 12 and the 2nd modulation / demodulation part 14 is provided. Thereby, the reception data of the first modem unit 12 becomes transmission data of the second modem unit 14, the reception data of the second modem unit 14 becomes transmission data of the first modem unit 12, and the first modem unit. The timing at which the signal 12 is transmitted to the network 3 and the timing at which the second modulation / demodulation unit 14 transmits the signal to the network 5 are controlled so as not to overlap each other, and the signal transmitted from the first modulation / demodulation unit 12 and the second Since the timing at which the signals transmitted from the modem unit 14 are simultaneously synchronized is prevented, the signals of the networks 3 and 5 can be relayed by preventing the signals from colliding with each other via the third filter. become able to.

(Embodiment 2)
Hereinafter, a bidirectional communication relay system according to a second embodiment of the present invention will be described with reference to the drawings. The configuration of the bidirectional communication relay system of the second embodiment is the same as the configuration of the bidirectional communication relay system of the first embodiment, as shown in FIG. Further, the frequency band to be used is the same as that in the first embodiment, and the frequency arrangement diagram in the bidirectional communication relay system of the second embodiment is as shown in FIG.

  The two-way communication relay system according to the second embodiment is different from the first embodiment only in the transmission / reception timing in the repeater 6, and the other parts are the same. The transmission / reception timing in the repeater 6 of the bidirectional communication relay system according to the second embodiment will be described below.

  FIG. 5 shows the flow of transmission data between the devices in the bidirectional communication relay system of the second embodiment. FIG. 6 shows the transmission / reception timing of each transmission data.

  Reference numerals 31a to 31d denote transmission data and signal timing related to the network 3 shown in FIG. 1, and reference numerals 32a to 32c denote transmission data and signal timing related to the network 5.

  5 and 6, 31a is a downlink signal from the center apparatus 1, 31b is an uplink signal from the terminal 2a, 31c is an uplink signal from the terminal 2n, and 31d is an uplink signal from the repeater 6. . On the other hand, 32a is a downlink signal from the repeater 6, 32b is an uplink signal from the terminal 4a, and 32c is an uplink signal from the terminal 4m. In addition, the transmission data of the filled-in part of FIG. 6 has shown the transmission data which the relay device 6 transmits / receives.

  The operation of the transmission / reception timing of the repeater 6 in the relay system for bidirectional communication according to the second embodiment will be described below.

  First, the operation | movement and timing of the signal between each apparatus in the case of transmitting to the terminals 4a-4m accommodated in the network 5 from the center apparatus 1 are demonstrated.

  In FIG. 1, the repeater 6 receives a downlink signal 31 a from the center apparatus 1. The control unit 16 filters and selects the communication channel 21 for the up / down line using the first filter 11 connected to the first connection terminal 72 connected to the network 3, and the first modulation / demodulation unit 12 selects the center. The signal received from the apparatus 1 is demodulated.

  Then, the control unit 16 stores the demodulated data output from the first modulation / demodulation unit 12 in the communication data memory 74 and analyzes the destination of the demodulated data based on the information in the relay destination table 71. When the destination is the terminal 4 a to 4 m accommodated in the network 5, the transmission data stored in the communication data memory 74 is transferred to the second modulation / demodulation unit 14 at a timing that does not overlap with the timing of other transmission data. . The second modulation / demodulation unit 14 modulates the transferred data, filters the uplink / downlink communication channel 21 by the second filter 13, and is accommodated in the network 5 connected to the second connection terminal 73. The downlink signal 32a is transmitted to the terminals 4a to 4m. The downlink signal 32a from the repeater 6 to the terminals 4a to 4m is transmitted from the repeater 6 by broadcast.

  Here, the control unit 16 transmits the downlink signal 32a to the terminals 4a to 4m in the communication time zone not assigned by the center device 1, so that the transmission timing of the downlink signal 32a does not overlap with other communication timings. I am doing so. In FIG. 6, the downlink signal 32a is transmitted between the uplink signals 32b and 32c from the terminal 2a and the terminal 2n at a time not allocated by the center apparatus 1, so that the downlink signal 32a is converted into the uplink signal 32b. And 32c so as not to overlap with the communication timing. Since the repeater 6 has previously received information on the communication time allocated for communication by the center device from the center device, the control unit 16 can control in this way.

  Next, the operation and timing of signals between the devices when transmitting to the center device 1 from the terminals 4a and 4m accommodated in the network 5 will be described.

  The transmission timing of the upstream signals 32b and 32c from the terminals 4a and 4m accommodated in the network 5 to the repeater 6 is controlled by the repeater 6 so that no data collision occurs. The control unit 16 of the repeater 6 controls the terminal 4a and the terminal 4m to allocate a transmission time to the repeater 6 so that no data collision occurs.

  The repeater 6 uses the second filter 13 connected to the second connection terminal 73 connected to the network 5 to filter and select the communication channel 21 for the up / down line, and the second modem unit 14 selects the network 5. Demodulate the signals received from the terminals 4a and 4m accommodated in.

  Then, the control unit 16 stores the demodulated data output from the second modulation / demodulation unit 14 in the communication data memory 74 and analyzes the destination of the demodulated data based on the information in the relay destination table 71.

  When the destination analyzed by the control unit 16 is other than the terminals 4 a to 4 m included in the network 5, the control unit 16 transfers the data stored in the communication data memory 74 to the first modem unit 12. The first modulation / demodulation unit 12 modulates the transferred data, filters the uplink / downlink communication channel 21 by the first filter 11, and transmits the uplink signal 31 d to the center apparatus 1. Similar to the transmission timing of the terminals 2a to 2n included in the network 3, the transmission timing of the upstream signal 31d from the repeater 6 to the center device 1 is assigned by the center device 1 so that no data collision occurs. Done and controlled. That is, the control unit 16 transfers the data stored in the communication data memory 74 to the first modulation / demodulation unit 12 so that the upstream signal 31d is transmitted to the center device 1 at the transmission timing assigned by the center device 1. To do.

  On the other hand, when the destination analyzed by the control unit 16 is the terminals 4a to 4m included in the network 5, the timing is not shown in FIG. 6, but in the communication data memory 74 as in the first embodiment. The stored data is transferred to the second modem unit 14. The second modulation / demodulation unit 14 modulates the transferred data, filters the uplink / downlink communication channel 21 by the second filter 13, and sends the downlink signal 32a to any one of the destination terminals 4a to 4m. Send. Since the control unit 16 transmits the downlink signal 32a using a time zone not assigned by the center device 1, the transmission timing of the downlink signal 32a does not overlap with other communication timings.

  Thus, since the control part 16 allocates and controls communication time so that transmission / reception with the terminals 6a-4m which belong to the network 5, and the repeater 6 may be performed in the time slot | zone not allocated by the center apparatus 1. The timing at which the first modem unit 12 transmits the signal 31d to the network 3 and the timing at which the second modem unit 14 transmits the signal 32a to the network 5 are controlled so as not to overlap each other. In addition, the timing at which the first modem unit 12 receives the signal 31a from the center apparatus 1 and the timing at which the second modem unit 14 transmits the signal 32a to the network 5 are controlled so as not to overlap each other. Become. The timing at which the second modem unit 14 receives the signals 32b and 32c from the terminals 4a and 4m and the timing at which the first modem unit 12 transmits the signal 31d to the network 3 are controlled so as not to overlap each other. Will be.

  As described above, the bidirectional communication relay system according to the second embodiment accommodates the center device 1, the network 3 that accommodates the plurality of terminals 2a to 2n, and the plurality of terminals 4a to 4m. The other network 5 and the repeater 6 which connects the network 3 and the network 5 are provided. The repeater 6 includes a first filter 11 for filtering the signal of the network 3, a first modulation / demodulation unit 12 for modulating / demodulating the signal extracted by the first filter 11, and a signal of the network 5. A second filter 13 for wave generation, a second modulation / demodulation unit 14 for modulating / demodulating the signal extracted by the second filter 13, a third filter 15 for connecting the network 3 and the network 5 to each other, and a first modulation / demodulation The control part 16 which processes the data input / output to the part 12 and the 2nd modulation / demodulation part 14 is provided. Thereby, the reception data of the first modem unit 12 becomes transmission data of the second modem unit 14, the reception data of the second modem unit 14 becomes transmission data of the first modem unit 12, and the first modem unit. The timing at which 12 transmits the signal 31d to the network 3 and the timing at which the second modem unit 14 transmits the signal 32a to the network 5 are controlled so as not to overlap each other. The timing at which the first modem unit 12 receives the signal 31a from the center apparatus 1 and the timing at which the second modem unit 14 transmits the signal 32a to the network 5 are controlled so as not to overlap each other. The timing at which the second modem unit 14 receives the signals 32b and 32c from the terminals 4a and 4m and the timing at which the first modem unit 12 transmits the signal 31d to the network 3 are controlled so as not to overlap each other. . By being controlled in this way, it is possible to avoid collision between the transmission and reception signals via the third filter, and to relay the signals of the network 3 and the network 5.

  Next, usage examples of the bidirectional communication relay system of the present invention will be described.

  FIG. 7 shows a schematic diagram when the bidirectional communication relay system of the present invention is applied to a train.

  A train is usually equipped with a network of coaxial cables for each vehicle. According to the present invention, it is possible to construct a relay system for bidirectional communication that effectively utilizes this existing coaxial cable network.

  Reference numerals 63, 64, and 65 in FIG. 7 denote coaxial networks provided in each train vehicle. As shown in FIG. 7, the center apparatus 1 is connected to the coaxial network 63, and the repeaters 61 and 62 of the present invention are provided between the coaxial networks 63-64 and between the coaxial networks 64-65, respectively. The bidirectional communication relay system of the present invention can be configured. In this way, by utilizing the existing coaxial networks 63, 64, 65, it is possible to construct a relay system for bidirectional communication that is easy to construct and inexpensive.

  Further, according to the present invention, it is possible to construct a relay system for bidirectional communication that integrates a plurality of buildings of an apartment. Normally, condominiums have a coaxial network in each building. This coaxial network is configured by connecting a coaxial cable and a distributor such as CATV. By connecting the center devices and connecting the networks of each building with the repeater of the present invention, it is possible to construct a bidirectional communication relay system that integrates a plurality of buildings in the apartment. Since an existing coaxial network can be used, a relay system for two-way communication can be constructed easily and inexpensively.

  In addition to these, if there are a plurality of coaxial networks, a relay system for bidirectional communication can be easily constructed by relaying them using the method of the present invention.

  In each embodiment, the network 3 and the network 5 use the communication channel for the upper and lower lines having the same frequency. However, the frequency within the frequency band of the communication channel for the upper and lower lines is used separately, and the network 3 and the network 5 are used. The upper and lower communication channels may be different in frequency.

  Further, in each embodiment, the combination of the network and the repeater that does not include the center device has been described in two sets as illustrated in FIG. 1, but those connected to the network 3 that includes the center device 1 are described. The combination may be one set or three or more sets.

  The program of the present invention is a program for causing a computer to execute the function of the center control unit of the above-described center device of the present invention, and is a program that operates in cooperation with the computer.

  The recording medium of the present invention is a recording medium carrying a program for causing a computer to execute the function of the center control unit of the above-described center device of the present invention, and the program readable and read by the computer Is a recording medium used in cooperation with the computer.

  The program of the present invention is a program for causing a computer to execute the function of the relay control unit of the repeater of the present invention described above, and is a program that operates in cooperation with the computer.

  The recording medium of the present invention is a recording medium carrying a program for causing a computer to execute the function of the relay control unit of the above-described repeater of the present invention, and the program readable and read by the computer Is a recording medium used in cooperation with the computer.

  Further, one usage form of the program of the present invention may be an aspect in which the program is recorded on a computer-readable recording medium and operates in cooperation with the computer.

  Further, the recording medium includes a ROM and the like.

  The computer of the present invention described above is not limited to pure hardware such as a CPU, and may include firmware, an OS, and peripheral devices.

  As described above, the configuration of the present invention may be realized by software or hardware.

  As described above, the present invention filters the communication channel of a bidirectional communication system for the purpose of relaying the same frequency, time division multiplexed bidirectional communication system to another bidirectional communication system. Two-way communication with each other via another filter that filters the broadcast channel of the bidirectional communication system by providing a control unit for controlling data transfer between the two modulation / demodulation units. This was realized by connecting the system.

  It can be used in the same frequency, time division multiplexing wired communication relay system.

Configuration diagram of relay system for bidirectional communication according to Embodiment 1 of the present invention Frequency allocation diagram of relay system for bidirectional communication according to Embodiment 1 of the present invention The figure which shows the relationship of the communication time slot | zone between each apparatus in the relay system for bidirectional | two-way communication of Embodiment 1 of this invention. The figure which shows the transmission destination information of the header part at the time of communication between each apparatus in the relay system for bidirectional | two-way communication of Embodiment 1 of this invention. The figure which shows the flow of the transmission data between each apparatus in the relay system for bidirectional | two-way communication of this Embodiment 2. The figure which shows the transmission / reception timing between each apparatus in the relay system for bidirectional | two-way communication of Embodiment 2 of this invention. Schematic diagram when the relay system for bidirectional communication of the present invention is applied to a train Configuration diagram of a conventional two-way communication relay system Frequency allocation diagram of conventional two-way communication relay system

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Center apparatus 2a-2n Terminal 3 Network 4a-4m Terminal 5, 81 Network 6, 80 Repeater 11 1st filter 12 1st modem part 13 2nd filter 14 2nd modem part 15 3rd filter 16 Control unit 21 Up and down channel communication channel 22 Broadcast channel 31a Downlink signal 31b, 31c, 31d Uplink signal 32a Downlink signal 32b, 32c Uplink signal 41 Network 42 Center device 43 Network 44 Center device 45 Gateway 51a Uplink control channel 51b Downlink control channel 52a, 53a, ... Uplink communication channel 52b, 53b, ... Downlink communication channel 70 All destination table 71 Relay destination table 72 First connection terminal 73 Second connection terminal 74 Memory for communication data 75 Center unit controller

Claims (15)

A first communication network having a plurality of terminals;
A second communication network having at least one other plurality of terminals;
A first memory connected to the first communication network and storing a first destination table having destination information of the plurality of terminals and the other plurality of terminals; and the plurality of the plurality of terminals belonging to the first communication network A center apparatus having a center control unit that controls communication allocation of the terminals and performs communication between the terminals,
A second destination table connected to the first communication network as one terminal, connected to the second communication network, and having destination information of at least the other terminals belonging to the second communication network And the communication allocation of the plurality of other terminals is extracted, and the information addressed to any one of the plurality of other terminals is extracted from the communication information transmitted from the center apparatus. The information transmitted to the destination terminal and from the information received from any one of the plurality of other terminals, information destined for any other terminal of the other plurality of terminals is extracted and A relay unit having a relay control unit that transmits to a destination terminal and transmits information other than that addressed to any other terminal to the center device,
The bidirectional communication relay system, wherein the first memory also stores combination information of the second communication network and the repeater. The first communication network and the second communication network are networks that perform time division communication in the same frequency band,
The center device performs time allocation of communication with a plurality of terminals belonging to the first communication network and with the repeater,
The relay control unit of the repeater, based on the time allocation of the communication sent from the center device, the time not allocated by the center device to a plurality of other plurality of belonging to the second communication network The bidirectional communication relay system according to claim 1, wherein the relay system is assigned to a time for communication with each terminal. The relay control unit has a communication data memory for holding communication data,
The information addressed to any one of the other terminals received from the center device is extracted and held in the memory for communication data, and at the time allocated for communication with the destination terminal, Send the information to the destination terminal,
Information received from any one of the other plurality of terminals is held in the communication data memory, out of the held information, information addressed to any other terminal of the other plurality of terminals, The information transmitted to the destination terminal at the time allocated for communication with the destination terminal, and information other than that addressed to any other terminal is transmitted to the center apparatus allocated by the center apparatus. The relay system for bidirectional communication according to claim 2, wherein transmission is performed to the center device at a time for communication between the two. The center device also transmits a broadcast signal using a frequency band different from the frequency band used for communication with each of a plurality of terminals belonging to the first communication network,
The repeater includes a first connection point connected to the first communication network, a second connection point connected to the second communication network, the first connection point, and the second connection point. Having a connection line connecting the connection points,
The relay system for bidirectional communication according to claim 2, wherein the relay control unit is connected to each of the first connection point and the second connection point. The repeater is
A first filter that filters a signal of communication data transmitted from the center device between the relay control unit and the first connection point;
A second filter for filtering communication data signals transmitted from a plurality of other terminals belonging to the second communication network between the relay control unit and the second connection point; The relay system for bidirectional communication according to claim 4.   The bidirectional relay system according to claim 5, wherein the repeater further includes a third filter that filters the broadcast signal in the middle of the connection line. The repeater further includes:
A signal that is arranged between the relay control unit and the first filter and that has been transmitted from the center device that has been filtered by the first filter is demodulated, and is also filtered by the first filter. A first modulation / demodulation unit that modulates a signal to be transmitted to the center device;
It is arranged between the relay control unit and the second filter, and transmitted from any one of the plurality of other terminals belonging to the second communication network filtered by the second filter. And a second modulation / demodulation unit that modulates a signal to be transmitted to any one of the other plurality of terminals to be demodulated and to be filtered by the second filter. The relay system for bidirectional communication as described. The frequency of the signal transmitted from the center device to the repeater is different from the frequency of the signal transmitted from the repeater to the center device,
Further, the frequency of a signal transmitted from any one of the plurality of other terminals belonging to the second communication network to the repeater, and any one of the other plurality of terminals from the repeater The relay system for bidirectional communication according to claim 2, wherein the frequency of the signal transmitted to is different.   2. The bidirectional communication relay system according to claim 1, wherein each terminal of the first communication network and the second communication network is connected by a coaxial cable and a distributor. A relay device used in the bidirectional communication relay system according to claim 1,
The relay control unit that is connected to the first communication network as one terminal, is also connected to the second communication network, and controls communication allocation of the plurality of other terminals belonging to the second communication network. Having a repeater. Connected to a first communication network having a plurality of terminals and a second communication network having at least one other plurality of terminals, and destinations of the plurality of other terminals belonging to at least the second communication network Using a repeater having a memory storing a second destination table with information,
Controlling communication allocation of the other plurality of terminals belonging to the second communication network;
From the communication information sent from the center apparatus that controls communication allocation of the plurality of terminals connected to the first communication network and belongs to the first communication network and performs communication between the terminals. Extracting information addressed to any one of the plurality of other terminals belonging to the communication network 2 and transmitting the information to the destination terminal;
Out of information received from any one of the other plurality of terminals belonging to the second communication network, information destined for any other terminal of the other plurality of terminals is extracted and the destination terminal Sending to
A step of transmitting information other than one addressed to any other terminal among the plurality of other terminals from the information received from any one of the other terminals to the center device. Communication relay method. The center device according to claim 1,
A program for causing a computer to function as a center control unit that controls communication assignment of the plurality of terminals belonging to the first communication network and performs communication between the terminals.   A recording medium carrying the program according to claim 12 and usable by a computer. The repeater of claim 1.
Control communication allocation of the other terminals, extract information addressed to any one of the other terminals from the communication information sent from the center device, and transmit the information to the destination terminal; Further, out of information received from any one of the other plurality of terminals, information destined for any other terminal of the other plurality of terminals is extracted and transmitted to the destination terminal. A program for causing a computer to function as the relay control unit, which transmits information other than that addressed to any of the terminals to the center device. 15. A recording medium carrying the program according to claim 14 and usable by a computer.

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