JP2019125879A - Communication system and communication method - Google Patents

Abstract

To implement communication between apparatuses in different in-formation networks.SOLUTION: A communication system includes: a communication device for relaying communication between a trunk network for communication between railway vehicle formations and in-formation networks for communication inside the railway vehicle formations; and apparatuses on the in-formation networks. The apparatuses include a transmission unit for transmitting data in which an address showing directed broadcasting to the communication device on the trunk network and a predetermined port number are set. The communication device includes: a determination unit for determining whether or not the predetermined number is set in the data received; and a conversion unit that when it is determined by the determination unit that the predetermined number is set, converts the address showing the directed broadcasting to an address showing directed broadcasting to an apparatus on an in-formation network to which the communication device is to relay communication.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a communication system and a communication method.

  IEC 61375 is known as an international standard for a railway vehicle network using Ethernet (registered trademark). In IEC 61375, an “in-organization network” which is an internal network of a formation or train formation (a group of vehicles formed of one or more vehicles used for trains) and a “core network” connecting the in-formation networks are IEC 61375 -3-4 and IEC 61375-2-5 respectively.

  These standards specify IP (Internet Protocol) address assignment, route search, etc. on the assumption that data will be transmitted from devices on one intra-organization network to devices on another intra-organization network via a backbone network. It is done.

  By the way, for example, in a railway crossing a region, a border or the like, one train may be formed by formation of different railway companies. In such a case, devices on one intra-organization network may not be able to obtain IP addresses of devices on another intra-organization network.

  On the other hand, it is also conceivable to communicate with devices on other intra-organization networks by performing multicast to all devices (or some devices) on other intra-organization networks.

JP 2012-90369 A International Publication No. 2013/027286

  However, many devices on the intra-organization network do not support multicast. This is because the devices installed in the railway vehicle generally have limited usable storage areas, computational resources, and the like.

  Therefore, an embodiment of the present invention aims to realize communication between devices in networks in different formations.

  In order to achieve the above object, the embodiment of the present invention provides communication between a backbone network for communicating between formations of railway vehicles and an intra-formation network for communicating within the formations of railway vehicles. A communication system including a communication device to be relayed and a device on the intra-organization network, wherein the device has an address indicating a directed broadcast for the communication device on the backbone network, and a predetermined port number. A determination unit that determines whether the predetermined port number is set in the received data, and the transmission unit configured to transmit the set data; and the predetermined port number from the determination unit In the organization where the communication device relays communication, indicating that the directed broadcast is set. A conversion unit that converts the address indicated a directed broadcast for devices on Ttowaku, characterized by having a.

  Communication can be realized between devices of different intra-organization networks.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows an example of the whole structure of the network system for rail cars concerning this embodiment. It is a figure showing an example of hardware constitutions of a router concerning this embodiment. It is a figure showing the example of hardware constitutions of the device concerning this embodiment. It is a figure which shows the function structural example of the router which concerns on this embodiment. It is a figure which shows the function structural example of the apparatus which concerns on this embodiment. It is a flowchart (Example 1) which shows the operation example of the apparatus of a transmission origin. It is a flowchart (Example 1) which shows the operation example of the router which exists in the same organization as the apparatus of a transmission origin. It is a flowchart (Example 1) which shows the operation example of the router in organization different from the apparatus of a transmission origin. It is a flowchart (Example 2) which shows the operation example of the apparatus of a transmission origin. It is a flowchart (Example 2) which shows the operation example of the router which exists in the same organization as the apparatus of a transmission origin. It is a flowchart (Example 3) which shows the operation example of the apparatus of a transmission origin. It is a flowchart (Example 3) which shows the operation example of the router which exists in the same organization as the apparatus of a transmission origin.

  Hereinafter, embodiments of the present invention (the present embodiment) will be described in detail with reference to the drawings. In this embodiment, a case will be described in which communication between devices in networks in different formations is realized by using directed broadcast and port forwarding.

<Example of overall configuration>
First, the overall configuration of the railway car network system 1 according to the present embodiment will be described with reference to FIG. FIG. 1 is a diagram showing an example of the entire configuration of the railway car network system 1 according to the present embodiment.

  FIG. 1 shows, as an example, a railway vehicle network system 1 in the case where a train is configured by three formations of a first formation, a second formation, and a third formation. The railway vehicle network system 1 shown in FIG. 1 is composed of a backbone network for each organization and an intra-organization network for each organization. That is, the railway vehicle network system 1 shown in FIG. 1 includes a first organization backbone network and an organization network, a second organization backbone network and an organization network, and a third organization backbone network and an organization network. It is configured.

  Further, in the railway vehicle network system 1 shown in FIG. 1, the network address of the backbone network of each formation is “10.128.0.0”, and the network address of the intra-formation network of each formation is “192.168.0. It shall be 0 ". The network address of the intra-organization network may be different for each organization.

  Each organization includes the router 10, the device 20, the HUB 30, the HUB 40, and the coupler 50.

  The router 10 is a communication device that relays data (hereinafter referred to as “communication data”) between the backbone network and the in-organization network. The router 10 is assigned an IP address on the backbone network side and an IP address on the organization side network.

  For example, in the router 10 included in the first formation of the railway vehicle network system 1 shown in FIG. 1, the IP address “10.128.0.101” on the backbone network side and the IP address “192 on the formation network side” And “168.0.1” is assigned.

  Similarly, for example, in the router 10 included in the second formation of the railway vehicle network system 1 shown in FIG. 1, the IP address “10.128.0.102” on the backbone network side and the IP on the intra-formation network side The address "192.168.0.1" is assigned.

  Similarly, for example, in the router 10 included in the third formation of the railway vehicle network system 1 shown in FIG. 1, the IP address “10.128.0.103” on the backbone network side and the IP side on the intra-formation network side The address "192.168.0.1" is assigned.

  It is assumed that these routers 10 are set as default gateways in the organization network of the organization in which the router 10 is included.

  In the railway vehicle network system 1 shown in FIG. 1, although one router 10 is included in each formation, the present invention is not limited to this. Each organization may include two or more routers 10. However, for example, even when two or more routers 10 are included in a certain organization, the router 10 set as a default gateway is one of the two or more routers 10. .

  The devices 20 are various devices or devices that implement various functions of the vehicle. As the device 20, for example, a control device for controlling the brake, a control device for controlling the speed of the vehicle, a control device for controlling the air conditioner, a control device for controlling the opening and closing of the door, a control device for controlling the display of the liquid crystal panel, auxiliary There are various control devices such as a power supply device, a broadcasting device, a destination indicator, and a control central device.

  Each device 20 is assigned an IP address in the intra-organization network. For example, in the intra-organization network of the first organization, the device 20 to which the IP address "10.128.0.11" is assigned, and the device 20 to which the IP address "192.128.0.12" is assigned, The device 20 to which the IP address “192.128.0.21” is assigned and the device 20 to which the IP address “192.128.0.22” is assigned are included.

  Similarly, for example, the device 20 to which the IP address "10.128.0.31" is assigned and the device to which the IP address "192.128.0.32" is assigned to the intra-organization network of the second organization 20, a device 20 to which the IP address "192.128.0.41" is assigned, and a device 20 to which the IP address "192.128.0.42" is assigned.

  Similarly, for example, the device 20 to which the IP address "10.128.0.51" is assigned and the device to which the IP address "192.128.0.52" is assigned to the intra-organization network of the third organization 20, a device 20 to which the IP address “192.128.0.61” is assigned, and a device 20 to which the IP address “192.128.0.62” is assigned.

  Although the example shown in FIG. 1 shows the case where there is no device 20 to which the same IP address is assigned among the intra-organization networks, the present invention is not limited thereto, and the same IP address may be used between the intra-organization networks. There may be a device 20 assigned. That is, it is preferable that there is no device 20 to which the same IP address is assigned at least on the same in-organization network.

  The HUB 30 is a device that relays communication data from the device 20 or communication data to the device 20 in the intra-organization network of each organization. In the railway vehicle network system 1 shown in FIG. 1, although one HUB 30 is included in each formation network, it is not limited to this. Each intra-organization network may include two or more HUBs 30 or may not include the HUB 30.

  The HUB 40 is an apparatus for relaying communication data from the router 10 or communication data to the router 10 in the backbone network of each organization. In the railway vehicle network system 1 shown in FIG. 1, although one HUB 40 is included in each backbone network, the present invention is not limited to this. Each backbone network may or may not include two or more HUBs 40. The coupler 50 is a device for connecting between the backbone networks of each organization.

  The configuration of the railway vehicle network system 1 shown in FIG. 1 is an example, and may be another configuration. For example, the railway vehicle network system 1 may be configured with a first formation and a second formation, or may be configured with a plurality of four or more formations.

  Hereinafter, when the router 10 included in the first organization, the router 10 included in the second organization, and the router 10 included in the third organization are distinguished, “router 10-1”, “router 10- 2 ”and“ router 10-3 ”. Also, in the case of distinguishing the device 20 included in the first formation, the device 20 included in the second formation, and the device 20 included in the third formation, “device 20-1”, “device 20-2 And “apparatus 20-3”.

<Hardware configuration example>
Next, the hardware configuration of the router 10 and the device 20 according to the present embodiment will be described.

«Router 10»
First, the hardware configuration of the router 10 according to the present embodiment will be described with reference to FIG. FIG. 2 is a diagram showing an example of the hardware configuration of the router 10 according to the present embodiment.

  As shown in FIG. 2, the router 10 according to this embodiment communicates with a central processing unit (CPU) 11, a random access memory (RAM) 12, a read only memory (ROM) 13, an external I / F 14, and An I / F 15 and an auxiliary storage device 16 are provided. These pieces of hardware are communicably connected by a bus 17.

  The CPU 11 is an arithmetic device that implements control and functions of the entire router 10 by reading programs and data from the ROM 13 and the auxiliary storage device 16 onto the RAM 12 and executing processing.

  The RAM 12 is a volatile semiconductor memory that temporarily holds programs and data. The ROM 13 is a non-volatile semiconductor memory that can hold programs and data even after the power is turned off.

  The external I / F 14 is an interface with an external device. The external device is, for example, a recording medium 14a. The router 10 can read and write the recording medium 14 a via the external I / F 14. The recording medium 14a includes, for example, an SD memory card, a USB memory, and the like.

  The communication I / F 15 is an interface for communicating with other routers 10, devices 20, and the like. The communication I / F 15 includes a communication interface on the backbone network side and a communication interface on the organization side network.

  The auxiliary storage device 16 is a non-volatile memory storing programs and data, and is, for example, a hard disk drive (HDD) or a solid state drive (SSD). The programs and data stored in the auxiliary storage device 16 include an operating system (OS) which is basic software for controlling the entire router 10 and application software which provides various functions on the OS.

  The router 10 according to the present embodiment can realize various processes to be described later by having the above-described hardware configuration. However, the hardware configuration of the router 10 is not limited to the example shown in FIG. The router 10 may be realized by, for example, a large-scale integrated circuit (LSI) or the like.

«Device 20»
Next, the hardware configuration of the device 20 according to the present embodiment will be described with reference to FIG. FIG. 3 is a diagram showing an example of the hardware configuration of the device 20 according to the present embodiment.

  As shown in FIG. 3, the device 20 according to the present embodiment includes an MPU (Micro Processing Unit) 21, a RAM 22, a ROM 23, and a communication I / F 24. These pieces of hardware are communicably connected by a bus 25.

  The MPU 21 is an arithmetic device that implements control and functions of the entire device 20 by reading programs and data from the ROM 23 or the like onto the RAM 22 and executing processing.

  The RAM 22 is a volatile semiconductor memory that temporarily holds programs and data. The ROM 23 is a non-volatile semiconductor memory that can hold programs and data even after the power is turned off.

  The communication I / F 24 is an interface for communicating with the router 10 and other devices 20 and the like.

  The device 20 according to the present embodiment can realize various processes to be described later by having the above-described hardware configuration.

<Example of functional configuration>
Next, functional configurations of the router 10 and the device 20 according to the present embodiment will be described.

«Router 10»
First, the functional configuration of the router 10 according to the present embodiment will be described with reference to FIG. FIG. 4 is a diagram showing an example of a functional configuration of the router 10 according to the present embodiment.

  As shown in FIG. 4, the router 10 according to the present embodiment includes a first communication unit 101, a port forwarding unit 102, and a second communication unit 103. These units are realized by processing that one or more programs installed in the router 10 cause the CPU 11 to execute.

  The first communication unit 101 receives communication data from the intra-organization network side and transmits the communication data to the intra-organization network side.

  The port forwarding unit 102 performs port forwarding on communication data received by the first communication unit 101 or the second communication unit 103. That is, port forwarding unit 102 determines whether the port number set in the communication data received by first communication unit 101 or second communication unit 103 is a predetermined port number determined in advance. Do. When the port forwarding unit 102 determines that the port number set in the communication data received by the first communication unit 101 or the second communication unit 103 is a predetermined port number, the port forwarding unit 102 sets it as the communication data. Convert the destination IP address (destination IP address) that has been sent to an address indicating directed broadcast. Hereinafter, the predetermined port number is also referred to as "port number A".

  The second communication unit 103 receives communication data from the backbone network side, and transmits communication data to the backbone network side.

«Device 20»
Next, the functional configuration of the device 20 according to the present embodiment will be described with reference to FIG. FIG. 5 is a diagram showing an example of a functional configuration of the device 20 according to the present embodiment.

  As shown in FIG. 5, the device 20 according to the present embodiment includes a communication data creation unit 201 and a communication unit 202. These units are realized by processing that one or more programs installed in the device 20 cause the MPU 21 to execute.

  The communication data creation unit 201 creates communication data to be transmitted to the device 20 of another intra-organization network.

  The communication unit 202 transmits the communication data generated by the communication data generation unit 201 and receives the communication data transmitted from the router 10 of the same intra-organization network.

<Operation example>
Hereinafter, operations of the router 10 and the device 20 included in the railway car network system 1 according to the present embodiment will be described. In each of the embodiments described below, as an example, the device 20 of the transmission source is a certain device 20-1 on the intra-organization network of the first organization, and the device 20 of the transmission destination is on the intra-organization network of the second organization. And all the devices 20-3 on the intra-organization network of the third organization.

Example 1
In the first embodiment, by performing port forwarding on communication data relayed from the backbone network to the intra-organization network, the device 20 on the intra-organization network in the first organization is in the organization of the second organization and the third organization. A case of communicating with the device 20 on the network will be described.

  First, an operation example of the transmission source device 20-1 will be described with reference to FIG. FIG. 6 is a flowchart (first embodiment) showing an operation example of the transmission source device 20-1.

  The communication data creation unit 201 creates communication data in which the port number A and the address indicating the directed broadcast of the backbone network are respectively set as the destination port number and the destination IP address (step S101).

  More specifically, the communication data creation unit 201 sets an address indicating directed broadcast of the backbone network to the destination IP address of the IP header, and the port number A indicates the destination of the UDP (User Datagram Protocol) header. Create communication data set in the port number. Here, for example, when the network address of the backbone network is “10.128.0.0”, the address indicating directed broadcast of this backbone network is “10.128.255.255”.

  The above step S101 is executed, for example, when communication between the device 20-1 and the device 20 on another intra-organization network is required. Such a case differs depending on the type of the device 20 etc. However, for example, when control of the air conditioner becomes necessary, when it becomes necessary to open and close the door, various controls can be made by connecting with other formations. When it becomes necessary etc. are mentioned.

  The communication data created in step S101 described above includes, for example, data for the device 20 of the transmission destination. Although the content of such data varies depending on the type of the transmission destination device 20 and the content of the control command to the device 20, for example, in the case of control of an air conditioner, a command for operating or terminating the air conditioner may be mentioned. .

  Next, the communication unit 202 transmits the communication data created by the communication data creation unit 201 (step S102).

  Here, an address “10.128.255.255” indicating a directed broadcast of the backbone network is set as the destination IP address of the communication data created in step S101 above. Therefore, the communication unit 202 transmits the communication data created in step S101 described above to the router 10-1 in the same organization (that is, the default gateway of the first organization in the organization network).

  Next, an operation example of the router 10 (that is, the router 10-1 in the same organization as the transmission source device 20-1) that receives the communication data transmitted by the device 20-1 in the above step S102 This will be described with reference to FIG. FIG. 7 is a flowchart (first embodiment) showing an operation example of the router 10-1 in the same organization as the transmission source device 20-1.

  First, the first communication unit 101 receives communication data from the device 20 on the same organization network (step S201). That is, the first communication unit 101 receives the communication data transmitted from the device 20-1 in step S102 of FIG.

  Next, the second communication unit 103 transmits the communication data received by the first communication unit 101 to all the other routers 10 on the backbone network (step S202). That is, the destination IP address set in the communication data received by the first communication unit 101 in step S201 above is the address "10.128.255.255" indicating directed broadcast of the backbone network. Therefore, the second communication unit 103 transmits the communication data to all the other routers 10 (router 10-2 and router 10-3) of the backbone network. At this time, the second communication unit 103 simultaneously transmits the communication data to all other routers 10 of the backbone network by directed broadcast.

  Subsequently, an operation example of the router 10 (that is, the router 10-2 and the router 10-3 in another organization) that receives the communication data transmitted in the above step S202 will be described with reference to FIG. . FIG. 8 is a flowchart (first embodiment) showing an operation example of the router 10-2 and the router 10-3 in a different organization from the device 20-1 of the transmission source.

  First, the second communication unit 103 receives communication data from another router 10 on the backbone network (step S301). That is, the second communication unit 103 receives the communication data transmitted from the router 10-1 in step S202 of FIG.

  Next, the port forwarding unit 102 determines whether the port number set as the destination port number of the communication data received by the second communication unit 103 is port number A (step S302).

  When it is determined in step S302 that the port number set in the destination port number of the communication data is port number A, the port forwarding unit 102 determines the IP address set in the destination IP address of the communication data. Are converted into an address indicating a directed broadcast of the intra-organization network (step S303).

  For example, the port forwarding unit 102 of the router 10-2 sets the IP address set in the destination IP address of the communication data to an address “192.168.0” indicating a directed broadcast of the network in the second organization. Convert to .255 ".

  Similarly, for example, the port forwarding unit 102 of the router 10-3 sets the IP address set as the destination IP address of the communication data to an address “192. Convert to 168.0.255 ".

  Next, the first communication unit 101 transmits the communication data received by the second communication unit 103 to all the devices 20 on the intra-organization network (step S304).

  For example, the first communication unit 101 of the router 10-2 transmits the communication data received by the second communication unit 103 to all the devices 20 on the intra-organization network of the second organization.

  Similarly, for example, the first communication unit 101 of the router 10-3 transmits the communication data received by the second communication unit 103 to all the devices 20 on the intra-organization network of the third organization.

  As a result, the devices 20 on the first intra-organization network can communicate with the devices 20 on the other intra-organization network. The communication data transmitted by the device 20 on the intra-organization network of the first organization is received by all the devices 20 on the intra-organization network of another organization.

  Note that, for example, when it is desired to communicate with only a specific type of device 20 among the devices 20 on the intra-organization network of another organization, the transmission source device 20 identifies the type, etc. May be generated and transmitted. Then, the device 20 that has received the communication data may discard the communication data if the type identified by the identification information included in the communication data is different from the type of the device 20 itself.

  On the other hand, when it is not determined in step S302 that the port number set as the destination port number of the communication data is port number A, the first communication unit 101 sets the destination IP address of the communication data. The communication data is transmitted to the device 20 indicated by the selected IP address (step S305).

  As described above, in the first embodiment, the device 20 (the device 20 of the transmission source) sets the predetermined port number A and the address indicating the directed broadcast of the backbone network to the destination port number and the destination IP address, respectively. Generate and send the set communication data. Then, each router 10 on the backbone network converts the destination IP address of the received communication data into an address indicating a directed broadcast of the in-organization network.

  As a result, the device 20 of the transmission source can transmit communication data to the device 20 on the intra-organization network of another organization. For this reason, even if the device 20 of the transmission source can not obtain the IP address of the device 20 on the in-organization network of the other organization, the device 20 with the other on-organization network in the other organization can be obtained. It will be possible to communicate between them.

  In addition, as described above, for example, when the identification data for identifying the type of the device 20 is included in the communication data, the device 20 that has received the communication data includes communication data that includes identification information of a type different from its own type. You can discard it.

(Example 2)
In the first embodiment, the case where port forwarding is performed on communication data relayed from the backbone network to the intra-organization network (steps S302 and S303 in FIG. 8) has been described. In the second embodiment, a case is also described in which port forwarding is also performed on communication data relayed from the intra-organization network to the backbone network.

  First, an operation example of the transmission source device 20-1 will be described with reference to FIG. FIG. 9 is a flowchart (second embodiment) showing an operation example of the transmission source device.

  The communication data creation unit 201 sets communication data in which the port number A and the IP address of the router 10 on the in-organization network (IP address on the in-organization network) are set as the destination port number and the destination IP address. Are created (step S401).

  More specifically, the communication data creation unit 201 sets the IP address "192.168.0.1" on the intra-organization network side of the router 10-1 included in the first organization as the destination IP address of the IP header. At the same time, communication data in which the port number A is set to the destination port number of the UDP header is created.

  Next, the communication unit 202 transmits the communication data created by the communication data creation unit 201 (step S402).

  Here, the destination IP address of the communication data created in step S401 described above includes the IP address “192.168. On the intra-organization network of the router 10-1 included in the same organization as that of the device 20-1 of the transmission source. 0.1 "is set. Therefore, the communication unit 202 transmits the communication data created in step S401 above to the router 10-1 in the same organization.

  Next, an operation example of the router 10 (that is, the router 10-1 in the same organization as the transmission source device 20-1) that receives the communication data transmitted by the device 20-1 in step S402 above will be described. This will be described with reference to FIG. FIG. 10 is a flowchart (second embodiment) showing an operation example of the router 10-1 in the same organization as the device 20-1 of the transmission source.

  First, the first communication unit 101 receives communication data from the device 20 on the same organization network (step S501). That is, the first communication unit 101 receives the communication data transmitted from the device 20-1 in step S402 in FIG.

  Next, the port forwarding unit 102 determines whether the port number set as the destination port number of the communication data received by the first communication unit 101 is the port number A (step S502).

  When it is determined in step S502 that the port number set in the destination port number of the communication data is port number A, the port forwarding unit 102 determines the IP address set in the destination IP address of the communication data. Is converted into an address indicating a directed broadcast of the backbone network (step S503).

  Next, the second communication unit 103 transmits the communication data received by the first communication unit 101 to all the other routers 10 on the backbone network (step S504). For example, the second communication unit 103 of the router 10-1 communicates with the first communication unit 101 for the router 10-2 included in the second organization and the router 10-3 included in the third organization. Send data

  Thereafter, the router 10-2 included in the second organization and the router 10-3 included in the third organization perform the operation described in FIG. Thereby, the device 20-1 on the in-organization network of the first formation can communicate with the device 20 on the in-organization network of the second formation and the device 20 on the in-organization network of the third formation.

  On the other hand, if it is determined in step S502 that the port number set as the destination port number of the communication data is not the port number A, the router 10-1 ends the process. In this case, the router 10-1 may discard the communication data received by the first communication unit 101.

  As described above, in the second embodiment, the device 20 (the transmission source device 20) sets the predetermined port number A and the IP address of the router 10 in the same organization as the destination port number and the destination IP address, respectively. And transmit the communication data. Then, the router 10 in the same organization as the transmission source device 20 converts the IP address set in the destination IP address into an address indicating a directed broadcast of the backbone network. As a result, as in the first embodiment, the device 20 of the transmission source can transmit communication data to the device 20 on the intra-organization network of another organization.

(Example 3)
The first embodiment and the second embodiment have been described in the case where communication data is transmitted to the devices 20 of all other formations different from the formation in which the transmission source device 20 is included. In the third embodiment, a case will be described in which communication data is transmitted to the device 20 included in a specific formation among all other formations different from the formation in which the transmission source device 20 is included. Hereinafter, the case of transmitting communication data to the device 20 of the third organization will be described as an example of a specific organization.

  First, an operation example of the transmission source device 20-1 will be described with reference to FIG. FIG. 11 is a flowchart (third embodiment) illustrating an operation example of the transmission source device 20-1.

  The communication data creation unit 201 creates communication data in which the port number A and the IP address on the backbone network side of the router 10 included in a specific organization are set as the destination port number and the destination IP address, respectively (Step S601).

  More specifically, the communication data creation unit 201 sets the IP address "10.168.0.103" on the backbone network side of the router 10-3 included in the third organization as the destination IP address of the IP header. At the same time, the communication data in which the port number A is set to the destination port number of the UDP header is created.

  In the third embodiment, the transmission source device 20 needs to obtain in advance the IP address on the backbone network side of the router 10 included in a specific organization. Such an IP address may be acquired from, for example, the router 10 included in the same organization. However, for example, instead of the IP address on the backbone network side of the router 10 included in a specific organization, identification information (for example, an organization number or the like) for identifying the specific organization may be used.

  Next, the communication unit 202 transmits the communication data created by the communication data creation unit 201 (step S602).

  Here, in the destination IP address of the communication data created in step S601 above, the IP address “10.168.0 on the backbone network side of the router 10-3 included in an organization different from that of the device 20-1 of the transmission source. .103 "is set. Therefore, the communication unit 202 transmits the communication data created in step S601 above to the router 10-1 in the same organization.

  Next, an operation example of the router 10 (that is, the router 10-1 in the same organization as the transmission source device 20-1) that receives the communication data transmitted by the device 20-1 in step S602 above will be described. This will be described with reference to FIG. FIG. 12 is a flowchart (third embodiment) illustrating an operation example of the router in the same organization as the transmission source device.

  First, the first communication unit 101 receives communication data from the device 20 on the same organization network (step S701). That is, the first communication unit 101 receives the communication data transmitted from the device 20-1 in step S602 in FIG.

  Next, the second communication unit 103 transmits the communication data to the router 10 indicated by the IP address set in the destination IP address of the communication data received by the first communication unit 101 (step S702). ). That is, the second communication unit 103 transmits the communication data to the router 10-3 included in the third organization.

  After that, the router 10-3 included in the third organization performs the operation described in FIG. As a result, the devices 20 on the intra-organization network in the first organization can communicate with the devices 20 on the intra-organization network in the third organization.

  As described above, in the third embodiment, the device 20 (the device 20 of the transmission source) transmits the predetermined port number A and the IP address of the router 10 included in the specific organization as the destination port number and the destination IP address. Communication data set in is generated and transmitted. Then, the router 10 in the same organization transmits the communication data to the router 10 included in the particular organization. Thereby, in the router 10 included in the specific organization, the destination IP address of the communication data is converted into an address indicating a directed broadcast of the in-organization network of the specific organization. As a result, the transmission source device 20 can transmit communication data to the device 20 on the in-organization network of another specific formation.

  The present invention is not limited to the above specifically disclosed embodiments, and various modifications and changes are possible without departing from the scope of the claims.

1 Network System for Railway Vehicles 10 Router 20 Equipment 30, 40 HUB
Reference Signs List 50 coupler 101 first communication unit 102 port forwarding unit 103 second communication unit 201 communication data creation unit 202 communication unit

Claims (6)

A communication device for relaying communication between a backbone network for communicating between formations of railway vehicles and an intra-formation network for communicating within the formations of railway vehicles; A communication system included,
The device is
The transmitter has a transmitter configured to transmit data in which an address indicating a directed broadcast to a communication device on the backbone network and a predetermined port number are set.
The communication device is
A determination unit that determines whether the predetermined port number is set in the received data;
When it is determined by the determination unit that the predetermined port number is set, an address indicating the directed broadcast is used as a directed broadcast for the device on the intra-organization network where the communication device relays communication. A conversion unit for converting to an address shown;
The communication system characterized by having. A communication device for relaying communication between a backbone network for communicating between formations of railway vehicles and an intra-formation network for communicating within the formations of railway vehicles; A communication system included,
The device is
It has a transmission unit for transmitting first data in which an address indicating a communication device for relaying communication between the organization network including the device and the backbone network and a predetermined port number are set,
The communication device is
A determination unit that determines whether the predetermined port number is set in the first data when the first data is received;
When it is determined by the determination unit that the predetermined port number is set, second data obtained by converting an address indicating the communication device into an address indicating directed broadcast for the communication device on the backbone network A converter that generates
Have
The determination unit is
When the second data is received, it is determined whether the predetermined port number is set in the second data,
The conversion unit is
When it is determined by the determination unit that the predetermined port number is set, an address indicating a directed broadcast for a communication device on the backbone network is used as an address on the intra-organization network in which the communication device relays communication. Translate to an address indicating directed broadcast to the device,
A communication system characterized by A communication device for relaying communication between a backbone network for communicating between formations of railway vehicles and an intra-formation network for communicating within the formations of railway vehicles; A communication system included,
The device is
There is a transmitter configured to transmit data in which an address indicating another communication device different from the communication device for relaying communication between the organization network including the device and the backbone network and a predetermined port number are set. And
The communication device is
A determination unit that determines whether the predetermined port number is set in the received data;
When it is determined by the determination unit that the predetermined port number is set, an address indicating the other communication device is directed to a device on the intra-organization network where the other communication device relays communication. A conversion unit for converting to an address indicating a broadcast;
The communication system characterized by having. A communication device for relaying communication between a backbone network for communicating between formations of railway vehicles and an intra-formation network for communicating within the formations of railway vehicles; A communication method in a communication system included, comprising
The device is
Performing a transmission procedure of transmitting data in which an address indicating a directed broadcast to a communication device on the backbone network and a predetermined port number are set;
The communication device is
A determination procedure of determining whether the predetermined port number is set in the received data;
If it is determined from the determination procedure that the predetermined port number is set, an address indicating the directed broadcast is directed broadcast to a device on the intra-organization network where the communication device relays communication. Conversion procedure to convert to the address shown
A communication method characterized by performing. A communication device for relaying communication between a backbone network for communicating between formations of railway vehicles and an intra-formation network for communicating within the formations of railway vehicles; A communication method in a communication system included, comprising
The device is
Performing a transmission procedure for transmitting first data in which an address indicating a communication device for relaying communication between the organization network including the device and the backbone network and a predetermined port number are set,
The communication device is
A determination procedure of determining whether the predetermined port number is set in the first data when the first data is received;
When it is determined from the determination procedure that the predetermined port number is set, second data obtained by converting an address indicating the communication device into an address indicating directed broadcast for the communication device on the backbone network Conversion procedure to generate
Run
The determination procedure is
When the second data is received, it is determined whether the predetermined port number is set in the second data,
The conversion procedure is
If it is determined from the determination procedure that the predetermined port number is set, an address indicating a directed broadcast for the communication device on the backbone network is an address on the intra-organization network where the communication device relays communication. Translate to an address indicating directed broadcast to the device,
A communication method characterized by A communication device for relaying communication between a backbone network for communicating between formations of railway vehicles and an intra-formation network for communicating within the formations of railway vehicles; A communication method in a communication system included, comprising
The device is
Execute a transmission procedure to transmit data in which an address indicating another communication device different from the communication device that relays communication between the organization network including the device and the backbone network and a predetermined port number are set And
The communication device is
A determination procedure of determining whether the predetermined port number is set in the received data;
If it is determined from the determination procedure that the predetermined port number is set, an address indicating the other communication device is directed to the device on the intra-organization network where the other communication device relays communication. A conversion procedure for converting to an address indicating a broadcast;
A communication method characterized by performing.

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