JP6076518B2 - Communication device and vehicle integrated management system - Google Patents

Description

  The present invention relates to a communication device and a vehicle integrated management system.

  Conventionally, in train formation composed of a plurality of vehicles, communication is performed between the vehicles. Train organization is not generally fixed, but is divided or merged. When the train organization is divided and merged, the communication target devices are also changed. In such a case, for example, in Patent Document 1 below, a static IP (Internet Protocol) address for a wired LAN (Local Area Network) and a static IP address for a wireless LAN are based on a routing table. A technique for converting an IP address is disclosed.

  Also, when train organization is merged by TCMS (Train Control and Monitoring System), the entry for the merge target organization subnet cannot be added to the routing table of ETBN with the routing function of ETBN (Ethernet (registered trademark) Train Backbone Network). . In such a case, the routing table can be updated by using a routing protocol such as OSPF (Open Shortest Pass Fast).

JP 2011-10279 A

  However, OSPF has a complicated protocol. Therefore, there is a problem that resources such as a CPU (Central Processing Unit) are consumed greatly in the communication device. In addition, since OSPF is not created on the assumption of frequent changes, there is a problem that it takes time to converge.

  The present invention has been made in view of the above, and an object thereof is to obtain a communication device and a vehicle integrated management system that can easily update an ETBN routing table in TCMS.

  In order to solve the above-described problems and achieve the object, the present invention is a communication device in which a plurality of communication devices are connected to form a vehicle integrated management system, and is connected to the communication device and is connected to a vehicle or a train. An address generation unit that generates a destination address that is a transmission destination of a packet using subnet identification information that identifies a subnet formed for each, and an entry addition unit that adds information on the destination address to a routing table It is characterized by that.

  According to the present invention, it is possible to easily update the ETBN routing table in TCMS.

FIG. 1 is a diagram illustrating a configuration example of a vehicle integrated management system. FIG. 2 is a diagram illustrating a configuration example of the TBN. FIG. 3 is a flowchart showing a TBN routing table update method. FIG. 4 is a diagram illustrating a configuration example of a TND table. FIG. 5 is a diagram illustrating a configuration example of the routing table.

  Embodiments of a communication apparatus and a vehicle integrated management system according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment.
FIG. 1 is a diagram illustrating a configuration example of a vehicle integrated management system according to the present embodiment. Here, TCMS is assumed. The vehicle integrated management system includes TBNs (Train Backbone Nodes) 1, 2 and 3 which are communication devices. TBN1 is connected to a network of subnet 4, TBN2 is connected to a network of subnet 5, and TBN3 is connected to subnet 6 , 7 are connected. FIG. 1 shows a state where three vehicles or three formations are merged when one TBN is installed in one vehicle or one formation to form one or more subnets. In FIG. 1, the upper side shows the ETB (Ethernet Train Backbones) side, and the lower side shows the ECN (Ethernet Consist Network) side.

  Each of the subnets 4 to 7 performs Ethernet (registered trademark) communication, and one or more end devices (terminals) are connected in one subnet. After merging, in the vehicle integrated management system shown in FIG. 1, it is possible to transmit and receive packets from a terminal in a certain subnet to a terminal in another subnet as the same Ethernet. In each TBN 1 to 3, black circles indicate IP ports. Each of the TBNs 1 to 3 is connected to another TBN through the IP port # 1, and is connected to the subnet side through the IP port # 2. In addition, in FIG. 1, although 3 TBN (1-3) is provided as a vehicle integrated management system, it is an example and it is also possible for TBN to be 2 or 4 or more.

  Next, the configuration of TBN 1 to 3 will be described. FIG. 2 is a diagram illustrating a configuration example of TBN1. As an example, TBN1 will be described, but TBN1 to TBN1-3 have the same configuration. The TBN 1 includes a routing entry update unit 10, a TTDP (Train Topology Discovery Protocol) unit 20, a NAT (Network Address Translation) unit 30, an OS (Operating System) unit 40, and an Ethernet driver unit 50.

  The routing entry update unit 10 adds an entry to the routing table 42 included in the IP unit 41 of the OS unit 40 to be described later and updates the routing table 42 when the TBN 1 of its own device is merged with another TBN. I do.

  The routing entry update unit 10 extracts an entry extraction unit 11 that extracts information described in each entry from a TND (Train Network Directory) table 21 included in the TTDP unit 20 described later, and the entry extracted by the entry extraction unit 11 Using the described information, the address generation unit 12 that generates the destination address and the next hop address described in the routing table 42, and the IP port information connected to the TBN side that is the packet transfer destination from the OS unit 40 are acquired. IP port information acquisition unit 13 and entry addition to add destination address, next hop address information generated by address generation unit 12 and IP port information acquired by IP port information acquisition unit 13 to routing table 42 Unit 14.

  The TTDP unit 20 includes a TND table 21. The TTDP unit 20 updates the TND table 21 by TTDP protocol processing and adds information on other TBNs to the TND table 21 when the TBN 1 of its own device is merged with other TBNs. When a plurality of TBNs are merged, each TBN holds the TND table 21 having the same content by executing the same protocol processing in the TTDP unit 20.

  The NAT unit 30 includes a NAT conversion table that records information for address conversion from an ECN side address to an ETB side address and from an ETB side address to an ECN side address. The address generation unit 12 of the routing entry update unit 10 refers to the NAT conversion table when generating an address.

  The OS unit 40 controls the operation of the TBN 1. The OS unit 40 includes an IP unit 41 including a routing table 42 used in packet transfer processing. The routing table 42 is a table in which information on the next hop address indicating the next TBN and the IP port information indicating the IP port that outputs the packet is registered according to the destination address of the packet to be transferred.

  The Ethernet driver unit 50 controls Ethernet communication with a subnet connected to another TBN and the TBN 1 of its own device.

  Next, the update process of the routing table 42 in the routing entry update unit 10 when the TBN 1 is merged with the other TBNs 2 and 3 will be described. FIG. 3 is a flowchart showing a method for updating the routing table of TBN1. First, in TBN1, the entry extraction unit 11 of the routing entry update unit 10 sets the entry to be extracted from the TND table 21 to 0 (step S1), refers to the TND table 21 of the TTDP unit 20, and extracts the entry as an extraction target. Information on entry 0 is extracted (step S2).

  FIG. 4 is a diagram illustrating a configuration example of the TND table 21. The TND table 21 records information such as CstUUID, CNid, subnetid, ETBNid, and CstOrientation for each entry. In the present embodiment, information of subnetid and ETBNid is used. Each entry shows the relationship between the TBN having the ETBNid described in the corresponding entry and the connected subnet.

  The entry extraction unit 11 checks whether or not the ETBNid in the extracted entry information matches the ETBNid indicating the own device (step S3). As described above, after merging, each TBN holds the TND table 21 having the same contents. Therefore, the TND table 21 includes the contents of the own device. The entry extraction unit 11 excludes entries corresponding to the own apparatus from being subject to update processing because the routing table 42 need not be updated. When referring to ETBNid = 05 of entry 0, the entry extraction unit 11 matches the ETBNid of its own device (step S3: Yes), so the process of steps S4 to S7 is omitted and the process proceeds to step S8. The entry extraction unit 11 increments the entry to be extracted from the TND table 21 when information extraction is not performed for all entries in the TND table 21 (step S8: No) (step S9). Specifically, the entry extraction unit 11 changes the entry to be extracted from 0 to 1, and returns to step S2.

  The entry extraction unit 11 refers to the TND table 21 of the TTDP unit 20 and extracts information on entry 1 as an entry extraction target (step S2). The entry extraction unit 11 checks whether or not the ETBNid in the extracted entry information matches the ETBNid indicating the own device (step S3). The entry extraction unit 11 refers to ETBNid = 06 of the entry 1 and confirms that it does not match the ETBNid of its own device (step S3: No). The entry extraction unit 11 notifies the address generation unit 12 of information on the extracted entry.

  Next, upon receiving notification of entry information from the entry extraction unit 11, the address generation unit 12 obtains subnetid = 6 information, which is subnet identification information, of the entry 1 information extracted by the entry extraction unit 11. The destination address is generated by using it (step S4). Specifically, the address generation unit 12 refers to the NAT conversion table of the NAT unit 30, and for the following address (1) in which the ETB side address “10.128.0.0/18” is expressed in binary number, In the portion corresponding to the 6-digit “s” shown in the following address (2), “000110” in which subnetid = 6 is expressed in binary is inserted to obtain the following address (3).

(1) 00001010.10000000.00000000.00000000 / 18
(2) 0000110.10.000 ssss. ss000000000000000 / 18
(3) 00001010.10000001.1,000,000,000,000 / 18

  The address generation unit 12 sets “10.1298.18.0/18” obtained by converting the address (3) to a decimal number as the destination address for the entry 1.

  Next, the address generation unit 12 generates a next hop address using information of ETBNid = 06, which is identification information of the TBN (communication device), of the information of the entry 1 extracted by the entry extraction unit 11 (Step S1). S5). Specifically, the address generation unit 12 refers to the NAT conversion table of the NAT unit 30 and adds ETBNid to the portion corresponding to the 6-digit “t” shown in the address (4) below with respect to the address (1). “000110”, in which = 06 is expressed in binary, is inserted to obtain the following address (5).

(4) 00001010.10000000.00000000.00tttttt / 18
(5) 00001010.10000000.00000000.00000110 / 18

  The address generation unit 12 sets “10.128.0.6/18” obtained by converting the address (5) to a decimal number as the next hop address for the entry 1.

  Next, the IP port information acquisition unit 13 receives the next hop address “10.128.0.6/ generated by the address generation unit 12 from the IP port information managed by the OS unit 40 from the OS unit 40. The information of the IP port to which the TBN corresponding to “18” is connected is acquired (step S6). As shown in FIG. 1, since each TBN 1 to 3 is connected to another TBN through the IP port # 1, the IP port information acquisition unit 13 acquires information about the IP port # 1.

  The entry adding unit 14 configures one entry using the destination address generated by the address generating unit 12, the next hop address information, and the IP port information acquired by the IP port information acquiring unit 13, The entry information is added to the routing table 42 (step S7).

  FIG. 5 is a diagram illustrating a configuration example of the routing table 42. The routing table 42 registers destination address, next hop address, and interface information for each entry. Specifically, the entry adding unit 14 stores, in the routing table 42, the entry “xx1”, the destination address “10.129.128.0/18”, and the next hop address “10.128.0.6/ “18” is added (registered) to “# 1” indicating IP port # 1 as an interface.

  The routing entry update unit 10 performs the above routing table update processing until information on all entries in the TND table 21 is extracted. If not implemented (step S8: No), as described above, the entry extraction unit 11 increments the entry to be extracted from the TND table 21 (step S9), and returns to step S2. On the other hand, when the information is extracted for all entries (step S8: Yes), the routing entry update unit 10 ends the update process of the routing table 42.

  In the routing entry update unit 10, when the routing table 42 is updated for entries 0 to 3 in the TND table 21 shown in FIG. 4, as shown in FIG. Information of entry “xx1” corresponding to entry 1, entry “xx2” corresponding to entry 2 of TND table 21, and entry “xx3” corresponding to entry 3 of TND table 21 can be added.

  In the present embodiment, in the routing entry update unit 10, a configuration for extracting an entry in the TND table 21, a configuration for generating a destination address and a next hop address, a configuration for acquiring IP port information, and an entry in the routing table 42 However, this is only an example, and the present invention is not limited to this. For example, the configuration for generating an address and the configuration for adding an entry to the routing table 42 may be one configuration.

  As described above, according to the present embodiment, in TBN, which is a communication device constituting the vehicle integrated management system, when train formation is merged, TCMS extracts entry information from the TND table. The destination address and the next hop address are generated using the information described in the extracted entry, and the IP port information corresponding to the next hop address is acquired, and the destination address, the next hop address, and the IP port information are obtained. It was decided to add it as an entry in the routing table. Thereby, in TBN, the routing table of ETBN can be updated by simple processing.

  As described above, the communication device and the vehicle integrated management system according to the present invention are useful for communication in train formation, and are particularly suitable for combining train formations.

  1, 2, 3 TBN (communication device), 4, 5, 6, 7 subnet, 10 routing entry update unit, 11 entry extraction unit, 12 address generation unit, 13 IP port information acquisition unit, 14 entry addition unit, 20 TTDP Part, 21 TND table, 30 NAT part, 40 OS part, 41 IP part, 42 routing table, 50 Ethernet driver part.

Claims (3)

A communication device in which a plurality of communication devices are connected to form a vehicle integrated management system,
An address generation unit that connects to the communication device and generates a destination address that is a transmission destination of a packet by using subnet identification information that identifies a subnet formed for each vehicle or train.
An entry addition unit for adding information of the destination address to a routing table;
A communication apparatus comprising: A communication device in which a plurality of communication devices are connected to form a vehicle integrated management system,
Using the communication device identification information for identifying the communication device, an address generation unit that generates a next hop address indicating an address of a communication device of a transfer destination that transfers a packet from the own device;
An entry adding unit for adding the next hop address to a routing table;
A communication apparatus comprising:   A vehicle integrated management system, wherein a plurality of communication devices according to claim 1 or 2 are connected.

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