Train Network Directory Based Routing Table Update

Solution Overview

Problem

The existing routing table update methods, such as OSPF, are complex and resource-intensive, leading to prolonged convergence times and inefficiencies in updating routing tables for Train Control and Monitoring Systems (TCMS) during train formation splits or mergers.

Innovation Solution

A communication apparatus for a car integrated management system that includes an entry extraction unit, an address generation unit, and an entry addition unit to simplify the update process by extracting information from the Train Network Directory table, generating destination and next hop addresses, and adding IP port information to the routing table, facilitating easy updates during train formation changes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If OSPF routing protocol is used to update routing table, then routing table can be updated during train formation changes, but CPU resource consumption increases considerably and convergence time becomes long

Engineering Contradiction:

Improverouting table update capabilityVSAvoidCPU resource consumption

Core Design Contradiction:

Adaptability or versatilityVSUse of energy by moving object

Solution Approach 1:

The patent extracts only the essential routing information needed for train formation changes from the complex OSPF protocol, implementing a simplified routing update mechanism that retrieves necessary routing data from TND table without processing the full OSPF protocol suite, thereby reducing CPU resource consumption while maintaining routing update capability

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The routing update process is segmented into distinct functional units: TND table management, routing table extraction, and selective update operations. This segmentation allows the system to process only relevant routing information during train formation changes rather than processing the entire routing protocol, reducing overall computational burden

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If OSPF routing protocol is used to update routing table, then routing table can be updated during train formation changes, but convergence time becomes long

Engineering Contradiction:

Improverouting table update capabilityVSAvoidconvergence time

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The system pre-establishes the TND (Train Network Directory) table containing all necessary routing information before train formation changes occur. This preliminary organization of routing data allows for rapid extraction and update during actual formation changes, eliminating the need for time-consuming protocol negotiations and convergence processes

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent extracts only the essential routing information needed for train formation changes from the complex OSPF protocol, implementing a simplified routing update mechanism that retrieves necessary routing data from TND table without processing the full OSPF protocol suite, thereby reducing CPU resource consumption while maintaining routing update capability

Inventive Principle:

Principle #2Taking out (Extraction)

3Reliability

If complex routing protocol is implemented in TCMS, then routing functionality is complete, but device complexity increases

Engineering Contradiction:

Improverouting functionalityVSAvoidprotocol complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts only the essential routing information needed for train formation changes from the complex OSPF protocol, implementing a simplified routing update mechanism that retrieves necessary routing data from TND table without processing the full OSPF protocol suite, thereby reducing CPU resource consumption while maintaining routing update capability

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The TND (Train Network Directory) table serves as an intermediary structure that pre-organizes routing information, acting as a mediator between the simplified routing update mechanism and the underlying network topology. This intermediary allows the system to achieve complete routing functionality through simple extraction and update operations rather than complex protocol processing

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS11323284B2Communication apparatus, car integrated management system, and routing table update method

Publication Date: 2022.05.03 MITSUBISHI ELECTRIC CORP

AI summary

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.