Wireless Relay Device for Train Control Information Classification

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Solution Overview

Problem

Existing wireless train control systems face challenges in managing increased train control information packets, leading to bandwidth shortages and potential delays in transmitting critical train control information.

Innovation Solution

A wireless relay device that classifies train control information into immediate and non-immediate categories, generating and transmitting messages accordingly to optimize bandwidth usage and reduce the number of data transfer messages.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If train control information is transmitted to multiple ground wireless devices in advance, then the number of packets increases n times, but the wireless bandwidth becomes insufficient

Engineering Contradiction:

Improvetransmission capacityVSAvoidnumber of packets

Core Design Contradiction:

ProductivityVSQuantity of substance

Solution Approach 1:

The patent segments train control information into two categories: immediate information (sent to currently connected ground wireless devices) and advance information (sent to multiple future ground wireless devices). This segmentation allows differential handling of packet types to manage bandwidth constraints.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent combines multiple advance information packets into a single packet by attaching destination information to existing immediate information packets. This merging reduces the total number of packets transmitted over the wireless line while maintaining the ability to deliver information to multiple destinations.

Inventive Principle:

Principle #5Merging (Combining)

2Productivity

If multiple packets are combined into one packet to reduce packet count, then transmission efficiency improves, but packets must be held for a certain period causing transmission suspension and delay

Engineering Contradiction:

Improvetransmission efficiencyVSAvoidtransmission delay

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The patent applies different quality characteristics to different packet types: immediate information packets are transmitted without delay to ensure real-time control, while advance information packets are combined and transmitted with acceptable delay since they are sent in advance to future destinations. This local differentiation resolves the contradiction between transmission efficiency and time loss.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS12221142B2Wireless relay device, and memory to store program for controlling wireless relay device

Publication Date: 2025.02.11 MITSUBISHI ELECTRIC CORP

AI summary

The wireless relay device according to the present disclosure includes: a reception unit to receive train control information; an information classification unit to classify the train control information into first control information requiring immediacy and second control information not requiring immediacy; a message generation unit to generate one message from the first control information contained in a piece of the train control information and to generate one message from a plurality of pieces of the second control information contained in a plurality of pieces of the train control information; and a transmission unit to transmit the messages generated by the message generation unit. With this configuration, it is possible to reduce the number of the data transfer messages which does not require immediacy while the instantaneous communication for the control information which requires immediacy is maintained.