Train Communication System Automates IP Allocation
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Solution Overview
Problem
Manual allocation of unique IP addresses to devices within train formations is labor-intensive and costly, and existing methods struggle to efficiently manage IP address distribution across different train formations.
Innovation Solution
A train communication system that includes a network with communication relay devices and position-information distribution devices, which rewrite position information to allocate unique IP addresses to terminal devices based on their vehicle information and physical ports, ensuring non-overlapping addresses within formations and consistent addresses across similar positions in different formations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual allocation of IP addresses is performed for all devices in train formations, then unique IP addresses can be assigned to each device, but the expense and labor required become excessively high
Solution Approach 1:
Each terminal device automatically determines its own IP address by combining the network address from position information packets with its terminal device ID, eliminating the need for manual IP address allocation by operators
Solution Approach 2:
Position information packets containing network addresses are distributed to terminal devices in advance through communication relay devices, enabling automatic IP address determination when devices start operating
2Adaptability or versatility
If conventional IP address allocation methods are used, then IP addresses can be assigned to devices, but it is difficult to efficiently manage IP addresses across different train formations with consistent addressing
Solution Approach 1:
The IP address is segmented into two parts: the network address from position information packets (common to all devices in the same position across formations) and the terminal device ID (unique to each device), enabling efficient management across different train formations
Solution Approach 2:
The position information packet distribution mechanism serves multiple functions: providing position information for routing and providing network address information for IP address determination, reducing system complexity
Data Source
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AI summary
Provided is a network that is constituted in a train formation; communication relay devices 1-1 to 1-3; terminal devices 5 to 10; and a position-information distribution device 4. The communication relay devices 1-1 to 1-3 rewrite position information from the position-information distribution device 4 to vehicle information indicating positions of vehicles that are provided with the communication relay devices 1-1 to 1-3 and transfer rewritten information. The terminal devices 5 to 10 include an IP-address correspondence table in which IP addresses that are set so as not to overlap with each other for respective types of the terminal devices 5 to 10 and are to be used while corresponding to the vehicle information and connection destination information of the terminal devices correspond to each other. IP addresses to be allocated to the terminal devices 5 to 10 are decided on the basis of the correspondence table and the vehicle information from the communication relay devices 1-1 to 1-3.