JP6189149B2 - Information communication system and routing method in information communication system - Google Patents

Description

  Embodiments described herein relate generally to an information communication system that controls data transmission / reception between networks having different bands and a routing method in the information communication system.

  As a conventional communication system, there is a system using information distribution software in a wired network called DDS: Data Distribution Service. In this system, communication can be performed from a sender (publisher) to a plurality of receivers (subscribers). However, such DDS is software that operates on a wired network with sufficient bandwidth, and is not expected to operate on a narrow-band network.

JP 2005-269378 A

  In the conventional communication system, even when a broadband network and a narrow-band network are adjacent to each other, communication using one path is fundamental, and the communication speed is limited to the transmission speed on the narrow-band network side.

  Therefore, in view of the above-described problems of the prior art, the present invention provides an information communication system and a routing method in this communication system that can greatly improve the communication speed even when a broadband network and a narrowband network are adjacent to each other. .

  An information communication system according to an embodiment of the present invention includes a data management server that generates transmission data, and transmission data that is connected to the data management server via a first network and is shared between the first networks. Are divided into a plurality of packet data based on the number of terminals that can be used for transmission, and a plurality of first data transmitting / receiving terminals that respectively transmit the packet data allocated to the terminal based on a predetermined classification rule; , Connected to the first data transmission / reception terminal via a second network whose bandwidth is narrower than that of the first network, and transmitted from the plurality of first data transmission / reception terminals via a plurality of paths, respectively. A second data transmission / reception terminal that receives and combines the packet data and restores the transmission data. .

1 is a block diagram showing an example of the overall configuration of an information communication system according to Embodiment 1 of the present invention. The figure which shows the example of application of the information communication system shown in FIG. The block diagram of the information communication system in FIG. The figure explaining the specific example of the classification rule of the packet data in the 1st data transmission / reception terminal shown in FIG. The block diagram of the information communication system in Embodiment 2 of this invention. The figure which shows the example of application of the information communication system which concerns on the modification of this invention.

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

<Embodiment 1>
FIG. 1 is a block diagram showing an example of the overall configuration of an information communication system according to Embodiment 1 of the present invention. The information communication system shown in FIG. 1 includes a data management server 1, N (N ≧ 2) first data transmission / reception terminals 2, and n (n ≧ 1) second data transmission / reception terminals 3. ing.

  The data management server 1 is a server computer that generates transmission data to be distributed to a lower terminal and supplies the transmission data to the first data transmission / reception terminal 2 via the first network NW1. The first data transmission / reception terminal 2 is connected to the data management server 1 via the first network NW1, and a plurality of transmission data shared between the first networks NW1 is based on the number of terminals that can be used for transmission. The relay terminal transmits the packet data allocated to the own terminal based on a predetermined classification rule.

  The second data transmission / reception terminal 3 is connected to the first data transmission / reception terminal 2 via the second network NW2 whose bandwidth is narrower than that of the first network NW1, and receives data from the plurality of first data transmission / reception terminals 2, respectively. It is a terminal that combines the packet data and restores the transmission data.

  FIG. 2 is a diagram showing an application example of the information communication system shown in FIG. 1, in which the transmission data generated by the data management server 1 passes through the artificial satellite ST and the first data transmission / reception terminal 2 to perform ocean surveys. It is shown that it is distributed to the running body (second data transmitting / receiving terminal 3). FIG. 3 is a block diagram of the information communication system in FIG.

  As shown in FIG. 2, the first data transmission / reception terminal 2 is distributed in the first network NW1 constructed on the water side and communicates wirelessly with the water side device 21 and the water side device 21. An underwater device 22 that is arranged underwater in a state of being connected via a cable and that transmits packet data transmitted from the waterside device 21 side to an underwater vehicle that is the second data transmission / reception terminal 3 using ultrasonic waves. Each has. Here, the waterside device 21 is a marine information provision buoy floating on the water surface, and the underwater device 22 is a sonar device.

  As shown in FIG. 3, the waterside apparatus 21 includes a data reception unit 211, a transmission data division unit 212, a terminal information storage unit 213, a data classification unit 214, a data collection unit 215, a collected data storage unit 216, and data A transmission unit 217 is included.

  The data reception unit 211 receives transmission data distributed from the data management server 1 and stores it in a reception buffer (not shown). The transmission data division unit 212 divides the transmission data received by the data reception unit 211 into a plurality of packet data based on the number of terminals that can be used for transmission. The terminal information storage unit 213 stores information such as the identification information of the terminal itself and the total number of waterside devices 21 present on the first network NW1.

  The data classification unit 214 classifies and holds the packet data divided by the transmission data division unit 212 based on a predetermined classification rule, and outputs the packet data to the corresponding underwater device 22. The data collection unit 215 collects measurement data transmitted from the second data transmission / reception terminal 3 via the measurement data reception unit 222 of the underwater device 22 and stores it in the collection data storage unit 216. The data transmission unit 217 reads the collected data from the collected data storage unit 216 and transmits it to the data management server 1.

  The underwater device 22 includes a divided data transmission unit 221 and a measurement data reception unit 222. The divided data transmission unit 221 transmits the divided data (packet data) input from the waterside device 21 (data classification unit 214) to the second underwater data transmission / reception terminal 3 (underwater vehicle) by ultrasonic communication. The measurement data receiving unit 222 receives measurement data transmitted by the second data transmitting / receiving terminal 3 (underwater vehicle) and outputs the measurement data to the water-side device 21.

  The second data transmitting / receiving terminal 3 (underwater vehicle) has a divided data receiving unit 301, a divided data combining unit 302, a measurement processing unit 303, and a measured data transmitting unit 304. The divided data receiving unit 301 receives the divided data transmitted by the divided data transmitting units 221 of the plurality of underwater devices 22. The divided data reception unit 301 has a function of detecting packets once stored in a reception buffer (not shown) so as not to hold the same packets, and deleting unnecessary data. The divided data combining unit 302 performs the decoding and data combination of the plurality of divided data (packet data) received from the plurality of underwater devices 22 by the divided data receiving unit 301 based on a predetermined communication protocol. Restore. Further, the divided data combining unit 302 checks whether or not the received packet stored in the reception buffer can be decoded, and discards the packet that cannot be decoded.

  When the transmission data restored in the divided data combining unit 302 includes control information related to the measurement process, the measurement processing unit 303 drives the screw based on this control information to move the body in water, The measurement process is performed using a sensor (not shown), and the processing result is output as measurement data. The measurement data transmission unit 304 transmits the measurement data output from the measurement processing unit 303 to the underwater device 22 using ultrasonic waves.

  FIG. 4 is a diagram for explaining a specific example of the packet data classification rule in the first data transmitting / receiving terminal 2 shown in FIG. Here, when the number of terminals m that can be used for transmission is 6, and the transmission data is divided into 12, the MOD (remainder) is taken by the number of terminals m, and packet data is classified for each data having the same value. For example, if the packet classification number corresponding to the terminal identifier A of the first data transmission / reception terminal 2 is 1, the first data transmission / reception terminal 2 (waterside) is calculated according to the calculation result of 1 MOD 6 = 1 and 7 MOD 6 = 1. The device 21) holds the first and seventh packet data corresponding to the terminal identifier of the own terminal and the packet classification number. And after holding data in each terminal, as shown in FIG. 2, packet data is transmitted toward the water from six of the underwater devices 22 of the terminal identifiers A to F. As described above, since the six paths A to F can be used for the place where the communication is normally performed by one path, the communication speed is increased six times.

  As described above, according to the information communication system according to the present embodiment, even when a broadband network and a narrowband network are adjacent to each other, packets are transmitted using a plurality of routes from the broadband network side to the narrowband network side. Since data can be distributed and transmitted, efficient communication can be realized.

<Embodiment 2>
As described in the first embodiment, the second data transmitting / receiving terminal 3 receives the packet transmitted from the first data transmitting / receiving terminal 2. However, since transmission / reception is performed by a narrow-band wireless network, not all transmitted packets are necessarily received, and only a part of them is received in many cases. Therefore, the present embodiment is characterized in that transmission data can be decoded when a predetermined number of packets or more are obtained by a communication method using forward error correction (FEC).

  FIG. 5 is a block diagram of an information communication system according to Embodiment 2 of the present invention. In addition, since the code | symbol which is common in the code | symbol used in Embodiment 1 has shown the same object, description is abbreviate | omitted and the difference from Embodiment 1 is demonstrated in detail below.

  As shown in FIG. 5, the transmission data division unit 212 includes a payload packet generation unit 212 a that generates a payload packet from transmission data distributed from the data management server 1, and a payload packet generated by the payload packet generation unit 212 a. A compensation packet generation unit 212b that generates a compensation packet is included. The transmission data division unit 212 generates, for example, 10 compensation packets for 5 payload packets by Reed-Solomon coding.

  In addition, by sharing transmission data between the data management server 1 and the first data transmission / reception terminal 2 connected to the broadband network NW1, the compensation packet is randomly selected and transmitted on each path to the water. Unlike the first embodiment, the data classifying unit classifies packet data transmitted from its own terminal based on terminal information and a predetermined classification rule because of the configuration for transmitting packet data to the second transmitting / receiving terminal 3 through a plurality of paths. 214 is omitted.

  On the other hand, the second data transmitting / receiving terminal 3 decodes the packet data received from the first data transmitting / receiving terminal 20 (underwater device 22). The divided data combining unit 302 of the second data transmitting / receiving terminal 3 can decode the original packet by arranging the same number of packets as the payload out of the total of the payload and the compensation packet. The decoding method uses erasure correction. An error position is specified by regarding a missing portion of the payload as a packet loss, and then the missing portion is compensated by the received compensation packet.

  As described above, according to the information communication system according to the present embodiment, all the packet data transmitted by the first data transmitting / receiving terminal 2 on the broadband network side cannot be received by the second data transmitting / receiving terminal 3 on the narrowband network side. Even so, since the transmission data can be restored from the received packet data, communication can be performed reliably.

  Since forward error correction (FEC) is used, transmission data is shared between the data management server 1 and the first data transmission / reception terminal 2 connected to the first broadband network NW1, while the underwater side The packet data can be transmitted to the second data transmitting / receiving terminal 3 through a plurality of routes by randomly selecting and transmitting the compensation packet.

<Modification>
In the above-described embodiment, the case where the broadband first network NW1 is constructed on the water side and the narrow-band second network NW2 is constructed on the water side has been described. However, the range to which the present invention can be applied is not limited to this. FIG. 6 is a diagram illustrating an application example of the information communication system according to the modification of the present invention. Here, a broadband wired network is constructed between the main island where the data management server 1 is installed and the three islands A to C where the first data transmission / reception terminal 2 is installed on the island. A narrow-band wireless network is constructed between the island and island D. Even in such a case, similarly to the above-described embodiment, the transmission data is divided among the A to C islands, and distributed to a plurality of routes to the second data transmitting / receiving terminal 3 arranged on the remote island (D island). By transmitting, it becomes possible to significantly improve the communication speed than before.

  As mentioned above, although some embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

NW1 ... first network, NW2 ... second network, 1 ... data management server,
2 ... 1st data transmission / reception terminal, 3 ... 2nd data transmission / reception terminal,
21 ... Water side device, 22 ... Underwater side device,
211: Data reception unit, 212: Transmission data division unit, 212a: Payload packet generation unit, 212b ... Compensation packet generation unit, 213 ... Terminal information storage unit, 214 ... Data classification unit, 215 ... Data collection unit, 216 ... Collected data Storage unit, 217 ... data transmission unit, 221 ... divided data transmission unit, 222 ... measurement data reception unit,
301: Divided data receiving unit 302: Divided data combining unit 303: Measurement processing unit 304: Measurement data transmitting unit

Claims (4)

A data management server for generating transmission data;
The transmission data connected to the data management server via the first network and shared between the first networks is divided into a plurality of packet data based on the number of terminals usable for transmission, A plurality of first data transmitting / receiving terminals respectively transmitting the packet data allocated to the terminal based on the classification rule;
The band is connected to the first data transmission / reception terminal via a second network whose bandwidth is narrower than that of the first network, and is transmitted from the plurality of first data transmission / reception terminals via a plurality of paths, respectively. A second data transmission / reception terminal that receives and combines packet data and restores the transmission data;
An information communication system comprising: When the first network is constructed on the water side and the second network is constructed on the underwater side, the plurality of first data transmitting / receiving terminals are:
A water-side device disposed on the first network side and performing wired or wireless communication;
An underwater side device that is arranged in water in a state connected to the waterside device via a wire, and transmits the packet data transmitted from the waterside device side to the second data transmitting / receiving terminal by ultrasonic waves,
The information communication system according to claim 1, further comprising: The first data transmission / reception terminal includes:
A payload packet generator for creating a payload packet from the transmission data;
A compensation packet generation unit that generates a compensation packet from the payload packet generated by the payload packet generation unit, and
3. The information according to claim 1, wherein the second data transmitting / receiving terminal restores the transmission data by receiving the same number of packets as the payload packets out of the total of the payload packets and the compensation packets. Communications system. A routing method in an information communication system for controlling data transmission / reception between networks having different bands,
The number of terminals that can be used for transmission by a plurality of first data transmitting / receiving terminals connected to a data management server that generates transmission data via the first network. Dividing into a plurality of packet data based on
Each of the plurality of first data transmitting / receiving terminals transmitting the packet data allocated to the terminal based on a predetermined classification rule;
The second data transmission / reception terminal connected to the first data transmission / reception terminal via the second network whose bandwidth is narrower than that of the first network has received from the plurality of first data transmission / reception terminals, respectively. Combining packet data and restoring the transmitted data;
A routing method in an information communication system, comprising:

Images