Communication apparatus, car integrated management system, and routing table update method

Patent metadata

Field	Value
Publication number	US-11323284-B2
Application number	US-201415304959-A
Country	US
Kind code	B2
Filing date	Apr 21, 2014
Priority date	Apr 21, 2014
Publication date	May 3, 2022
Grant date	May 3, 2022

Abstract

A car integrated management system has a plurality of communication apparatuses, each including: an extraction unit to extract entries from a table; an address unit to generate a destination address of a packet, using information to identify a subnet connected to each of the communication apparatuses, and to generate a next hop address that indicates an address of a transfer destination to which the packet is to be transferred, using information to identify each of the communication apparatuses, the subnet identification information and the communication apparatus identification information being included in entry extracted by the extraction unit; an acquisition unit to acquire information about an IP port to be used for sending the packet to a communication apparatus at the next hop address; and an entry addition unit to add information about the destination address, the next hop address, and the IP port to a routing table.

First claim

The invention claimed is:

1. A communication apparatus for a car integrated management system including a plurality of communication apparatuses connected to each other, each of the plurality of communication apparatuses being associated with a respective car or train formation, the communication apparatus comprising:
a processor configured to:
in response to the communication apparatus being merged with other communication apparatuses, of the plurality of communication apparatuses, as a result of merger of the car or train formation associated with the communication apparatus with the car or train formation associated with the other communication apparatuses,
merge a plurality of TND (Train Network Delivery) tables associated with the communication apparatus and the other communication apparatuses to form a merged TND table; and
update a routing table for the communication apparatus by:
evaluating each entry of the merged TND table, wherein entries associated with the communication apparatus are maintained separate from the routing table;
based on the evaluation of one or more entries of the merged TND table, generating a destination address as a delivery destination of a packet by use of a subnet identifier for identifying a subnet of a plurality of subnets, wherein each subnet is specific to a single respective car or train formation, wherein the destination address is different from an address for any of the plurality of communication apparatuses; and
adding information about the destination address to the routing table.

2. A communication apparatus for a car integrated management system including a plurality of communication apparatuses connected to each other, the communication apparatus comprising:
a processor configured to:
in response to the communication apparatus being merged with other communication apparatuses, of the plurality of communication apparatuses, as a result of merger of the car or train formation associated with the communication apparatus with the car or train formation associated with the other communication apparatuses,
merge a plurality of TND (Train Network Delivery) tables associated with the communication apparatus and the other communication apparatuses to form a merged TND table; and
update a routing table for the communication apparatus by:
evaluating each entry of the merged TND table, wherein entries associated with the communication apparatus are maintained separate from the routing table;
based on the evaluation of one or more entries of the merged TND table, generating a destination address as a delivery destination of a packet by use of a subnet identifier for identifying a subnet of a plurality of subnets, wherein each subnet is specific to a single respective car or train formation, wherein the destination address is different from an address for any of the plurality of communication apparatuses;
generating a next hop address that indicates an address of a transfer destination communication apparatus to which the packet is to be transferred from its own apparatus, based on communication apparatus identification information and an address translation table for translating Ethernet train backbones addresses to Ethernet Consist Network addresses; and
adding the destination address and the next hop address to the routing table.

3. The communication apparatus according to claim 2 , wherein the processor is further configured to:
refer to information of entry from the merged TND table, wherein
the subnet identifier is included in the information of entry.

4. The communication apparatus according to claim 3 , wherein the processor is further configured to:
acquire information about an IP (Internet Protocol) port to be used for sending the packet to the communication apparatus at the next hop address.

5. The communication apparatus according to claim 4 , wherein the processor is further configured to:
add the information about the IP port to the routing table.

6. A car integrated management system to which a plurality of communication apparatuses according to claim 1 are connected.

7. A car integrated management system to which a plurality of communication apparatuses according to claim 2 are connected.

8. A car integrated management system to which a plurality of communication apparatuses according to claim 5 are connected.

9. A routing table update method in a communication apparatus for a car integrated management system including a plurality of communication apparatuses connected to each other, each of the plurality of communication apparatuses being associated with a respective car or train formation, the method comprising:
in response to the communication apparatus being merged with other communication apparatuses, of the plurality of communication apparatuses, as a result of merger of the car or train formation associated with the communication apparatus with the car or train formation associated with the other communication apparatuses,
merging a plurality of TND (Train Network Delivery) tables associated with the communication apparatus and the other communication apparatuses to form a merged TND table; and
updating a routing table for the communication apparatus by:
evaluating each entry of the merged TND table, wherein entries associated with the communication apparatus are maintained separate from the routing table;
based on the evaluation of one or more entries of the merged TND table, generating a destination address as a delivery destination of a packet by use of a subnet identifier for identifying a subnet of a plurality of subnets, wherein each subnet is specific to a single respective car or train formation, wherein the destination address is different from an address for any of the plurality of communication apparatuses; and
adding information about the destination address to the routing table.

10. A routing table update method in a communication apparatus for a car integrated management system including a plurality of communication apparatuses connected to each other, the method comprising:
in response to the communication apparatus being merged with other communication apparatuses, of the plurality of communication apparatuses, as a result of merger of the car or train formation associated with the communication apparatus with the car or train formation associated with the other communication apparatuses,
merging a plurality of TND (Train Network Delivery) tables associated with the communication apparatus and the other communication apparatuses to form a merged TND table; and
updating a routing table for the communication apparatus by:
evaluating each entry of the merged TND table, wherein entries associated with the communication apparatus are maintained separate from the routing table;
based on the evaluation of one or more entries of the merged TND table, generating a destination address as a delivery destination of a packet by use of a subnet identifier for identifying a subnet of a plurality of subnets, wherein each subnet is specific to a single respective car or train formation, wherein the destination address is different from an address for any of the plurality of communication apparatuses;
generating a next hop address that indicates an address of a transfer destination communication apparatus to which the packet is to be transferred from its own apparatus, based on communication apparatus identification information and an address translation table for translating Ethernet train backbones addresses to Ethernet Consist Network addresses; and
adding the destination address and the next hop address to the routing table.

11. The routing table update method according to claim 10 , further c

Assignees

• Mitsubishi Electric Corp

Inventors

• Ogawa Yuji
• Hamada Yuji

Classifications

• B61L15/0036 Primary

  Conductor-based, e.g. using CAN-Bus, train-line or optical fibres · CPC title

• B61L15/0081

  On-board diagnosis or maintenance · CPC title

• H04B3/60

  Systems for communication between relatively movable stations, e.g. for communication with lift (H04B3/54 takes precedence) · CPC title

• H04L49/351

  for local area network [LAN], e.g. Ethernet switches · CPC title

• H04L49/25

  Routing or path finding in a switch fabric · CPC title