JP2016082326A - Communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication system capable of performing efficient distribution and shortening the time until distribution completion when performing simultaneous distribution for 1:n multi-base from a control station to terminal stations via a plurality of paths in the communication system which comprises the control station and a plurality of terminal stations and in which the control station and the terminal stations are connected by a main line and a backup line.SOLUTION: In a communication system which comprises a terrestrial simultaneous notification line (main line 30) and a satellite simultaneous notification line (backup lines 50) and duplexes the simultaneous notification line, a control station 10 includes life-and-death monitoring means 102b for performing life-and-death monitoring of the terrestrial simultaneous notification line while defining the control station itself as a transmission source; use situation monitoring means 102c for grasping use information of the backup line at the terminal station of a distribution destination; and line selection means 102d for selecting a communication path with highest efficiency. The time until the distribution completion is shortened by the communication with the terminal station based on a line selection result in the line selection means.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a communication system comprising a control station and a plurality of terminal stations, and the control station and the terminal stations are connected by a main line and a backup line. The present invention relates to a communication system capable of performing efficient transmission using a free route when performing simultaneous reporting to a base, and shortening the time until transmission is completed.

  Communication systems such as the simultaneous command system for disaster prevention administrative communications are installed in disaster prevention centers (control stations) installed in prefectural offices, etc. in municipalities, for example, firefighting headquarters for disaster countermeasures or river management departments for managing roads and rivers In order to reliably transmit information to multiple terminal stations, a terrestrial broadcast line (main line) and a satellite broadcast line (backup line) are equipped, and the simultaneous broadcast line is duplicated for backup. It is a system with improved reliability by providing a line. In recent years, the number of prefectural governments that have such a system configuration has been increasing.

  Patent Document 1 discloses a communication system suitable for receiving simultaneous notifications in a disaster prevention administrative communication system. Further, in Patent Document 1, in a communication system having a control station and a plurality of terminal stations and connecting the control station and the plurality of terminal stations via a transmission line, the control station includes a plurality of simultaneous command consoles, Each terminal station has a control device that controls signals transmitted from the simultaneous command control device, and a control device that controls information transmitted from the simultaneous command control device. Information transmission device, a storage unit and an operation unit, and the transmission path is used for simultaneous notification of the first general command console among the multiple general command consoles, The simultaneous report information from the second general command console in the general command console is stored in the storage device.

JP 2007-094629 A

As described above, conventionally, when performing a 1: n simultaneous report from the control station to the terminal station, a plurality of routes such as a main line and a backup line have been prepared in order to increase the reliability of communication. It was. However, since it is necessary to prepare different transmission means in order to increase line cost and other problems, the main line tends to be wideband and the backup line tends to be narrowband.
As a result, the number of terminal stations (n) increases, and when the majority of terminal stations can only communicate on the backup line without being able to communicate on the main line due to the influence of a large-scale disaster or the like, It will fall into the state where the time required to complete the communication to all bases increases.

  FIG. 7 is a system configuration diagram showing an example of the configuration of a conventional communication system, where (a) shows a normal case where the main line 30 is normal, and (b) is connected to the terminal station (4). The figure shows a case where a failure occurs in one of the main lines 30, and (c) shows a case where a failure occurs in the main line 30 connected to a plurality of terminal stations (2), (3), (4). Is shown.

  As shown in FIG. 7, the conventional communication system 2 includes a control station 70, a plurality of terminal stations (1) 80-1, a terminal station (2) 80-2, a terminal station (3) 80-3, a terminal station. (4) 80-4 (hereinafter, when terminal station (1) 80-1, terminal station (2) 80-2, terminal station (3) 80-3, and terminal station (4) 80-4 are not distinguished. (Hereinafter simply referred to as a terminal station 80), the control station 70, and each terminal station 80, a main line 30 using a broadband line such as a wide area Ethernet network, a satellite line network via a communication satellite 40, etc. And a backup line 50 using a narrow-band line.

As shown in FIG. 7A, in the normal case where the main line 30 is operating normally, in the conventional communication system 2, the broadcast information is transmitted from the control station 70 to each terminal station 80 through the broadband main line 30. Will be broadcast simultaneously.
Further, as shown in FIG. 7B, when a failure occurs in the main line 30 connected to the terminal station (4) 80-4, in the conventional communication system 2, the control station 70 is connected to the terminal station (1) 80-. 1, broadcast information can be broadcast simultaneously to the terminal station (2) 80-2 and the terminal station (3) 80-3 through the broadband main line 30, but for the terminal station (4) 80-4 Since the communication via the main line 30 is not possible, the control station 70 communicates with the terminal station (4) 80-4 via the backup line 50 and distributes the broadcast information via the backup line 50.

  Further, as shown in FIG. 7C, a failure has occurred in the main line 30 connected to the plurality of terminal stations (2) 80-2, the terminal station (3) 80-3, and the terminal station (4) 80-4. In this case, in the conventional communication system 2, the control station 70 can distribute the broadcast information to the terminal station (1) 80-1 through the broadband main line 30, but the terminal station (2) 80-2, the terminal station (3) Since 80-3 and the terminal station (4) 80-4 cannot communicate via the main line 30, the control station 70 transmits the terminal station (2) 80-2, terminal station ( 3) Communication is performed between 80-3 and the terminal station (4) 80-4, and broadcast information is distributed through the backup line 50.

Next, in the case of FIG. 7C, the time taken to distribute the broadcast information from the control station 70 to the terminal station 80 will be described with reference to FIG. 8. FIG. 8 is a diagram for explaining the time taken to distribute the broadcast information from the control station 70 to the terminal station 80.
FIG. 8 shows a case where the control station 70 and each terminal station 80 are connected to each other by the main line 30 and the backup line 50. The control station 70 is connected to the terminal station (1) 80. Assuming that the distribution over the main line 30 is completed in 1 second and the distribution over the backup line 50 is completed in 5 minutes, the broadcast information is distributed to all the terminal stations 80. It takes about 15 minutes to complete.

However, in the case of FIG. 7C and FIG. 8 described above, there are the following problems.
[1] In the system, it is necessary to contract an expensive backup line 50 having a low communication speed for path redundancy, but a large number of backup line contracts such that the control station 70: terminal station 80 is 1: 1 are costly. However, at most, only a few backup lines could be contracted on the control station 70 side.
[2] Since the backup line 50 has a narrow band, the communication time for one base is long.
[3] Since the backup line 50 is expensive, the risk at the time of failure increases as the number of terminal stations 80 increases due to difficulties such as the provision of the same number of lines as the terminal stations 80 in the control station 70. It was increasing.

  The present invention has been made in view of such conventional circumstances, and includes a control station and a plurality of terminal stations, and a communication system in which the control station and the terminal stations are connected by a main line and a backup line. To provide a communication system capable of performing efficient distribution and shortening the time until the completion of distribution when performing 1: n multi-site simultaneous distribution from a control station to a terminal station through a plurality of routes. Objective.

  In order to achieve the above object, a communication system according to the present invention comprises a control station and at least one terminal station, wherein the control station and the terminal station are connected by a main line and a backup line. The control station is a main line for monitoring a connection state between a simultaneous notification means for performing a simultaneous notification to the terminal station using either the main line or the backup line, and the main line of the terminal station. Monitoring means, backup line usage monitoring means for monitoring the usage status of the backup line of the terminal station, and simultaneous reporting by the simultaneous reporting means based on monitoring results by the main line monitoring means and the backup line usage monitoring means Line selection means for selecting a line to be distributed to the terminal station, and the terminal station distributes from the control station. Data distribution means for transmitting the simultaneous notification to the other terminal station using the backup line, and line status notification means for notifying the control station of the usage status of the backup line used by itself, The control station is characterized in that, when performing the simultaneous notification to the terminal station by the simultaneous notification means, performs a simultaneous notification based on a line selection result by the line selection means.

  Further, in the communication system described above, when a failure occurs in connection of a plurality of the terminal stations with the main line, the control station, with respect to the terminal station that does not have a failure in the main line, A simultaneous notification is made using the main line, and a failure is reported to the terminal station in which a failure has occurred in the main line using the backup line, or a failure has occurred in the main line. It is preferable to instruct the terminal station that is not present to make a simultaneous report using the backup line.

  In the communication system described above, the main line is a wideband line using a wide area Ethernet (registered trademark) network, and the backup line is a narrowband satellite line for performing wireless communication via a communication satellite. preferable.

  According to the present invention, in a communication system composed of a control station and a plurality of terminal stations and connected between the control station and the terminal stations by a main line and a backup line, 1: n from the control station to the terminal station. When performing multi-site simultaneous distribution over multiple routes, efficient distribution can be performed and the time to complete distribution can be shortened.

It is a block diagram which shows an example of a structure of the communication system which concerns on one Embodiment of this invention. It is a figure for demonstrating the relationship of the radio | wireless carrier of the communication satellite used by this invention. It is a figure which shows the frame structure of the transmission signal used by this invention. It is a figure which shows an example of the terminal station condition management table with which the control station | game 10 is provided. In the communication system according to an embodiment of the present invention, it is a diagram showing a connection state of the main line and the backup line when a failure occurs in the main line. It is explanatory drawing for demonstrating operation | movement of the communication system in the state shown in FIG. It is a system block diagram which shows an example of a structure of the conventional communication system. It is a figure for demonstrating the time concerning distribution of the simultaneous alert information from the control station 70 to the terminal station 80. FIG.

Hereinafter, a communication system according to an embodiment of the present invention will be described.
A communication system according to an embodiment of the present invention is installed, for example, from a disaster prevention center (control station) installed in a prefectural office or the like to a fire department headquarters for disaster countermeasures in a municipality or a river management section that manages roads and rivers. In order to ensure that information is transmitted to multiple terminal stations, a terrestrial broadcast line (main line) and a satellite broadcast line (backup line) are equipped, and the simultaneous line is duplicated to provide a backup line. In the communication system provided, the control station is a life and death monitoring means for monitoring the life and death of the terrestrial broadcast line using itself as a transmission source, a usage status monitoring means for grasping the usage information of the backup line of the terminal station of the distribution destination, Line selection means for selecting the most efficient communication path with reference to information on life and death monitoring means and usage status monitoring means, and the terminal station based on the line selection result in the line selection means By carrying out the communication between, in which it is possible to shorten the time until the distribution completion.

[System configuration of communication system]
A system configuration of a communication system according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing an example of the configuration of a communication system according to an embodiment of the present invention.
In FIG. 1, 10 is a control station installed in a disaster prevention center such as a prefectural office, and 20-1, 20-2,... 20-8 are terminal stations installed in a fire department or river management department. Is shown. Note that the terminal station 20 is collectively referred to as a terminal station. Since the terminal station (2) 20-2, the terminal station (3) 20-3,..., The terminal station (8) 20-8 has the same configuration as the terminal station (1) 20-1, The configuration is omitted. Reference numeral 30 denotes a transmission line installed on the ground, for example, a broadband main line such as a wide area Ethernet (registered trademark) network or an optical transmission line. Reference numeral 40 denotes a communication satellite. Reference numeral 50 denotes a narrow-band backup line such as a satellite line network for performing wireless communication via the communication satellite 40. In the present embodiment, a case where the backup line 50 is a single line will be described as an example.

The control station 10 includes a simultaneous command console 101, a simultaneous notification control device 102, a control device 103, a satellite earth station device 104, and a storage device 107. The simultaneous command console 101 includes an operation unit 101, a display unit 101 b, a command microphone 105 and a FAX (fax transceiver) 106. The storage device 107 has a terminal station status management table 1030 described later.
Each terminal station 20 includes a satellite earth station device 201 (a general term for satellite earth station devices 201-1, 201-2,... 201-8), a control device 202 (control devices 202-1, 201-2, .., 202-8), voice simultaneous receiver 203 (generic name of voice simultaneous receivers 203-1, 203-2,... 203-8) and FAX (fax transceiver) 204 (FAX 204- 1, 204-2,... 204-8). Note that the voice simultaneous reception unit 203 and the FAX (fax transceiver) 204 are also referred to as output devices. The control devices 103 and 202 have a line connection control function, and perform switching between the main line 30 and the backup line 50.

For the broadcast information, the operator operates the operation unit 101a of the general command console 101 of the control station 10 to activate the general command console 101, and uses the following lines as a terminal station as voice, fax, and data for the general report. 20 is delivered.
The terrestrial broadcast line is, for example, a signal conversion apparatus (not shown) of each terminal station 20 via a multiplex line 112 and a main line 30 connected from the control device 103 to a time division multiplexing apparatus (not shown). ) Through the path connected to the control device 202. Since transmission of signals by time division multiplexing is well known in the art, description thereof will be omitted.
In addition, the backup line 50, which is a satellite broadcast line, uses the broadcast information output from the control device 103 of the control station 10 via the communication satellite 40 from the satellite earth station device 104 and the satellite earth station of the terminal station 20. The route delivered to the device 202 is taken.

  Here, the backup line 50 which is a satellite line will be described. The backup line 50 is transmitted in accordance with a transmission method defined by, for example, the standard LASCOM (Local Authorities Satellite Communications Organization) STD-302. FIG. 2 shows the relationship between the radio carrier frequencies defined in L ASCOM STD-302. The downlink radio carrier ft from the control station 10 to the terminal station 20 via the communication satellite 40 is ft1, ft2 in the 14 GHz band. ,... Are recognized, and the uplink radio carrier fr from the terminal station 20 to the control station 10 via the communication satellite 40 is 12.25 GHz band, and fr1, fr2,. The wireless carriers ft1, ft2,... And the wireless carriers fr1, fr2,... Each have a bandwidth of 25 kHz. One or several waves are permitted for use in the simultaneous command system for disaster prevention administrative communication in each prefecture. For example, a pair wave of the downlink radio carrier ft1 and the uplink radio carrier fr1 is allocated as the simultaneous instruction radio carrier. Further, the signal multiplexing and the format in the transmission path are configured as shown in FIG. It is assumed that time elapses from left to right. As shown in FIG. 3, the transmission signal is composed of repeated frames, and one frame is composed of 20 ms and 700 symbols. S is a synchronization word and is composed of a 32-bit pattern. B and D indicate the data area of the baseband signal. The B channel is multiplexed as a 640-bit block and the D channel is multiplexed as a 20-bit block. This signal is scrambled and further added with a postamble P (8 bits). For example, error correction coding is performed at a coding rate of ½ to form a data stream of P and Q2 columns. Output from the control device 104.

  The simultaneous command system for disaster prevention administrative communication described above is also used as an individual communication line. This is defined, for example, in the standard LASCOM STD-301. However, the wireless carrier to be used is a wireless carrier different from the wireless carrier used in the broadcast. The voice signal is transmitted with a baseband signal of 32 kbps, the facsimile is transmitted with a voice signal band of 4.8 kbps at the maximum, and the data is transmitted with data of 4.8 kbps or lower in the voice signal band through a modem. However, detailed description is omitted.

  The broadcast information sent from the control station 10 from the ground broadcast line or the satellite broadcast line is supplied to the control device 202 of the terminal station 20, and the voice of the broadcast is sent to the voice simultaneous receiver 203. Is output as Further, the fax for simultaneous notification is output by FAX 204. In addition, in the case of data etc., it is once recorded on the memory | storage means 202c of the control apparatus 202, and is displayed on a display part (not shown) etc. as needed.

  Further, the simultaneous notification control device 102 of the control station 10 includes a distribution status management unit 102a, a main line monitoring unit 102b, a line use monitoring unit 102c, and a line selection unit 102d. The distribution status management means 102a monitors the reception status of the broadcast information distributed from the control station 10 to each terminal station 20, and registers and manages the reception status in the terminal station status management table 1030 described later. The main line monitoring unit 102b monitors the connection status from the control station 10 to each terminal station 20 via the main line 30, and registers the connection status in the terminal station status management table 1030. The line usage monitoring unit 102 c monitors the usage status of the backup line 50 of each terminal station 20 and registers the usage status in the terminal station status management table 1030. The line selection unit 102d refers to the connection status of the main line 30 and the usage status of the backup line 50 registered in the terminal station status management table 1030, and selects a line when distributing the broadcast information to each terminal station 20. And the control unit 103 is notified of the result. Also, the line selection unit 102d instructs the terminal station 20 with the normal main line 30 to distribute the broadcast information to the other terminal stations 20 with the main line 30 abnormal using the backup line 50. .

  Here, FIG. 4 is a diagram illustrating an example of a terminal station status management table provided in the control station 10. As shown in FIG. 4, the terminal station status management table 1030 includes a terminal station number 1031, a main line connection status 1032, a simultaneous notification reception confirmation result 1033, and a backup line usage status 1034.

  The control device 202 of the terminal station 20 includes distribution data receiving means 202a, line status notifying means 202b, storage means 202c, and data distribution means 202d. The distribution data receiving unit 202a receives the broadcast information distributed from the control station 10 and transmits a response signal to the control station 10 when the broadcast information is received. The line status notifying unit 202b notifies the control station 10 of the usage status of the backup line 50. The storage unit 202c records the broadcast message information distributed from the control station 10 in a recording unit (not shown). If the broadcast message information is data, the storage unit 202c stores the broadcast unit 202c according to an instruction from the operation unit 205. From the storage unit and displayed on a display unit (not shown).

[Operation of communication system]
Next, the operation of the communication system according to an embodiment of the present invention will be described with reference to FIGS. FIG. 5 is a diagram showing a connection state between the main line and the backup line when a failure occurs in the main line in the communication system according to the embodiment of the present invention. A connection state is shown, (b) is a figure for demonstrating the delivery time which delivers broadcast information to all the terminal stations from the control station 10. FIG. FIG. 6 is an explanatory diagram for explaining the operation of the communication system in the state shown in FIG.
In this embodiment, as shown in FIG. 5A, the terminal station (2) 20-2, the terminal station (3) 20-3, the terminal station (4) 20-4, and the terminal station (6) 20-6. A failure occurs in the main line 30 of the terminal station (7) 20-7 and the terminal station (8) 20-8, and broadcast information cannot be distributed from the control station 10 via the main line 30. It has become. In FIG. 6, the solid line arrow indicating the connection status between the control apparatus 103 and the terminal station 20 represents the main line 30, and the broken line arrow represents the backup line 50.

As shown in FIG. 6, first, an idle signal is transmitted from the simultaneous command console 101 to the simultaneous notification control device 102, for example, at intervals of 10 seconds (step S101). The broadcast notification control device 102 transmits the received idle signal to the control device 103, and instructs the terminal station 20 to transmit the broadcast notification information on both the main line 30 and the backup line 50 (step S102).
For the terminal station (1) 20-1, the terminal station (2) 20-2,..., The terminal station (8) 20-8, the control device 103 is, for example, the terminal station (1) 20-1, Station (2) 20-2,... The terminal number of terminal station (8) 20-8 (or the ID of the terminal station) is attached, and both the main line 30 and the backup line 50 are connected to 1 An idle signal is transmitted at intervals of ˜2 seconds (step S103). For transmitting information from the broadcast control device 102 to the terminal station (1) 20-1, terminal station (2) 20-2,..., Terminal station (8) 20-8, the terminal station (1) 20-1, terminal station (2) 20-2,..., Terminal station (8) Since the terminal number (or terminal station ID) of 20-8 is attached and transmitted, Description of terminal numbers (or terminal station IDs) of terminal stations (1) 20-1, terminal stations (2) 20-2,..., Terminal stations (8) 20-8 will be omitted.

At this time, as shown by x in FIG. 6, the terminal station (2) 20-2, the terminal station (3) 20-3, the terminal station (4) 20-4, the terminal station (6) 20-6, Since a failure has occurred in the main line 30 of the terminal station (7) 20-7 and the terminal station (8) 20-8, only the terminal station (1) 20-1 and the terminal station (5) 20-5 are Then, an idle signal reception response can be transmitted to the control device 103 via the main line 30 (step S104). Also, the terminal station (1) 20-1, the terminal station (2) 20-2,..., The terminal station (8) 20-8 sends an idle signal reception response to the control device 103 via the backup line 50. Is transmitted (step S105).
Each terminal station 20 transmits to the control device 103, together with the reception response of the idle signal, information about the usage status of its own backup line 50 by the line status notifying means 202b.

Based on the reception response of the idle signal transmitted from each terminal station 20 and the usage status information of the backup line 50, the control device 103 controls the notification of the main line connection status and the backup line usage status of each terminal station 20. The device 102 and the simultaneous command console 101 are notified (step S106).
The simultaneous notification control device 102 registers the main line connection status and backup line usage status of each terminal station 20 transmitted from the control device 103 in the terminal station status management table 1030 (step S107).

  In this state, when an emergency such as an earthquake occurs, emergency information is reported from the Japan Meteorological Agency or the like to the disaster prevention center where the control station 10 is installed. Therefore, the person in charge of the control station 10 operates the operation unit 101a of the general command console 101 to transmit a general notification calling signal to the general notification control apparatus 102 (step S108). The broadcast control device 102 refers to the terminal station status management table 1030, selects an optimum line for each terminal station 20, and transmits the line selection information to the control device 103 (step S109). Here, the line selection means 102d of the simultaneous notification control device 102 first uses the main line for the terminal station (1) 20-1 and the terminal station (5) 20-5 in which the main line 30 is normal. And instruct the terminal station (2) 20-2 to transmit the broadcast information using the backup line 50.

  Based on the line selection information transmitted from the simultaneous notification control apparatus 102, the control apparatus 103, as shown in FIG. 5B, via the main line 30, the terminal station (1) 20-1 and the terminal station (5 ) While delivering the broadcast information to 20-5, the broadcast information is distributed to the terminal station (2) 20-2 via the backup line 50 (step S110).

In the terminal station (1) 20-1 and the terminal station (5) 20-5, when the broadcast information is received, the distribution data receiving means 202a of the control device 202 notifies the control device 103 via the main line 30. An information reception response is transmitted (step S111).
The control device 103 notifies the broadcast notification control device 102 and the broadcast command console 101 of the reception result of the broadcast notification information based on the broadcast notification information reception response transmitted from each terminal station 20.

  The broadcast notification control apparatus 102 registers the broadcast report information reception result of each terminal station 20 transmitted from the control apparatus 103 in the terminal station status management table 1030 (step S112). Here, the simultaneous notification control apparatus 102 registers the terminal station (1) 20-1 and the terminal station (5) 20-5 in the terminal station status management table 1030 as reception confirmed.

  Next, since the terminal station (1) 20-1 and the terminal station (5) 20-5 have received reception confirmation and the backup line usage status is empty, the line selection unit 102d of the simultaneous notification control apparatus 102 has Broadcast information is transmitted to the terminal station (3) 20-3 and the terminal station (8) 20-8 using the backup lines 50 of the terminal station (1) 20-1 and the terminal station (5) 20-5. An instruction is given (step S113).

  Upon receiving this instruction, the control apparatus 103 uses the main line 30 so that the terminal station (1) 20-1 uses the backup line 50 to the terminal station (3) 20-3 and the terminal station (5) 20-5 backs up. The terminal 50 (8) 20-8 is instructed to transmit the broadcast information using the line 50 (step S114). At this time, the control device 103 may transmit the broadcast information to the terminal station (1) 20-1 and the terminal station (5) 20-5, or information specifying the broadcast command information transmitted in step S110. You may transmit to a terminal station (1) 20-1 and a terminal station (5) 20-5.

When the terminal station (1) 20-1 and the terminal station (5) 20-5 receive the above instruction, the terminal station (3) 20-3 and the terminal station (8) 20- 8 using its own backup line 50 (steps S115 and S116).
Here, in this embodiment, it is assumed that transmission of broadcast information using the main line 30 is completed in a few seconds, and transmission of broadcast information using the backup line 50 is completed in 5 minutes. At this time, the terminal station (2) 20-2 to which the control device 103 has transmitted the broadcast information using the backup line 50 in step S110 notifies the broadcast information reception response using the backup line 50 ( Step S117). Based on the broadcast message reception response from the terminal station (2) 20-2 received via the backup line 50, the control device 103 notifies the broadcast message control device 102 and the broadcast command console 101 of the reception result of the broadcast information. To do.

  The terminal station (3) 20-3 that has received the broadcast information from the terminal station (1) 20-1 via the backup line 50 receives the broadcast information, and then receives the broadcast information from the terminal station (1) 20-1 via the backup line 50. A broadcast information reception response is transmitted to 20-1 (step S118). The terminal station (1) 20-1 having received the broadcast information reception response from the terminal station (3) 20-3 controls the broadcast information reception response of the terminal station (3) 20-3 via the main line 30. 103 and the simultaneous command notification device 102. Similarly, the terminal station (5) 20-5 transmits a simultaneous notification information reception response (step S119) from the terminal station (8) 20-8 to the control device 103 and the simultaneous command notification device 102.

  Upon receiving these broadcast notification information reception responses, the broadcast notification control apparatus 102 appropriately registers the broadcast notification reception status in the terminal station status management table 1030 and notifies the broadcast command console 101 (step S120).

  Thereafter, similar to the processing in steps S113 to S120 described above, broadcast information is sent to the remaining terminal stations (4) 20-4, terminal stations (6) 20-6, and terminal stations (7) 20-7. Transmit (steps S121 to S128). Note that the control device 103 transmits broadcast information to the terminal station (6) 20-6 using the backup line 50 of the control station 10.

Therefore, as shown in FIG. 5B, first, the control station 10 completes communication to the terminal station (1) 20-1 and the terminal station (5) 20-5 on the main line 30. Further, the control station 10 communicates with the terminal station (2) 20-2 and the terminal station (6) 20-6 in which the main line 30 is unusable through the backup line 50 as in the conventional case.
The communication between the terminal station (1) 20-1 and the terminal station (5) 20-5 has already been completed at that time, and the backup lines of the terminal station (1) 20-1 and the terminal station (5) 20-5 have been completed. Since the terminal station (1) 20-1 is also available, the terminal station (1) 20-1 uses the backup line 50 of the terminal station (1) 20-1 to the terminal station (3) 20-3 and the terminal station (4) 20-4 that have not been distributed. Control to start communication. At the same time, the terminal station (5) 20-5 starts communication to the terminal station (8) 20-8 and the terminal station (7) 20-7 that have not been distributed using its own backup line 50. Control to do. As in the prior art, the control station 10 uses its own backup line 50 for the terminal station (2) 20-2 to the terminal station (4) 20-4 and the terminal station (6) 20-6 to the terminal station (8) 20. Although it takes about 30 minutes to transmit the simultaneous notification information to -8 in order, according to this configuration, communication to all the terminal stations 20 can be completed in about 10 minutes.

  As described above, according to the communication system according to the embodiment of the present invention, the control station is composed of a plurality of terminal stations, and the control station and the terminal stations are connected by the main line and the backup line. In a communication system, when performing 1: n multi-site simultaneous delivery from a control station to a terminal station through a plurality of routes, efficient delivery can be performed, and the time until delivery is completed can be shortened.

It should be noted that the configuration and operation of the above-described embodiment are examples, and it goes without saying that the embodiment can be appropriately modified and executed without departing from the spirit of the present invention.
For example, in the above-described embodiment, the wireless communication system in which both the main line and the backup line are wireless lines has been described as an example. However, either the main line or the backup line may be a wired line. Both may be wired lines.
In the above-described embodiment, the idle signal is transmitted using both the main line 30 and the backup line 50. However, only the main line 30 is used as an idle signal for confirming the line connection state. May be.

1: communication system, 2: communication system, 10: control station, 20-4: terminal station (4), 20-5: terminal station (5), 20-6: terminal station (6), 20-7: terminal Station (7), 20-8: Terminal station (8), 30: Main line, 40: Communication satellite, 50: Backup line, 70: Control station, 80: Terminal station, 80-1: Terminal station (1), 80-2: terminal station (2), 80-3: terminal station (3), 80-4: terminal station (4), 101: simultaneous command console, 101a: operation unit, 101b: display unit, 102: simultaneous report Control device, 102a: Distribution status management means, 102b: Main line monitoring means, 102c: Line use monitoring means, 102d: Line selection means, 103: Control device, 104: Satellite earth station device, 105: Command microphone, 106 : FAX, 107: storage device, 112: multiple line, 20 , 201-2,... 201-8: Satellite earth station device, 202, 202-1, 201-2,... 202-8: Control device, 202a: Distribution data receiving means, 202b: Line status notifying means 202c: storage means, 202d: data distribution means, 203, 203-1, 203-2,... 203-8: simultaneous voice receiver, 204, 204-1, 204-2,. 8: FAX, 205, 205-1, 205-2,... 205-8: Controller, 1030: Terminal station status management table, 1031: Terminal station number, 1032: Main line connection status, 1033: Broadcast notification received Confirmation result 1034: Backup line usage status.

Claims (3)

In a communication system composed of a control station and at least one terminal station, wherein the control station and the terminal station are connected by a main line and a backup line,
The control station
Simultaneous notification means for performing simultaneous notification to the terminal station using either the main line or the backup line;
Main line monitoring means for monitoring the connection status of the terminal station with the main line;
Backup line usage monitoring means for monitoring the usage status of the backup line of the terminal station;
Line selection means for selecting a line for delivering the simultaneous notification by the simultaneous notification means to the terminal station based on the monitoring result by the main line monitoring means and the backup line usage monitoring means,
The terminal station
Data distribution means for transmitting the simultaneous notification distributed from the control station to other terminal stations using the backup line;
Line status notifying means for notifying the control station of the usage status of the backup line used by itself,
The communication station according to claim 1, wherein the control station performs simultaneous notification based on a line selection result by the line selection means when performing the simultaneous notification to the terminal station by the simultaneous notification means.   The communication system according to claim 1, wherein when a failure occurs in connection with the main line of a plurality of the terminal stations, the control station, for the terminal station that does not have a failure in the main line, While making a simultaneous report using the main line and making a simultaneous report using the backup line to the terminal station in which a failure has occurred in the main line, or a failure has occurred in the main line A communication system characterized by instructing the terminal station that has not been broadcasted simultaneously using the backup line. 3. The communication system according to claim 1, wherein the main line is a broadband line using a wide area Ethernet (registered trademark) network, and the backup line is a narrow band satellite line for performing wireless communication via a communication satellite. A communication system characterized by being.