Train communication system and train-mounted monitoring system

By adopting multiphase orthogonal amplitude modulation technology and dynamic modulation strategy in the train communication system, combined with packet priority transmission and breakpoint retransmission technology, the problem of poor communication channel conditions of heavy-load railway trains is solved, and efficient and reliable data transmission is achieved.

CN119705542APending Publication Date: 2025-03-28SHENHUA RAIL & FREIGHT WAGONS TRANSPORT
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Patent Information

Application Number
CN202411830621.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-12
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

When heavy-loaded railway trains pass through complex geographical environments, the operator's network coverage is uneven, resulting in weak signals and low uplink throughput, affecting the real-time data transmission of the on-board monitoring system. The peak data transmission of different backhaul services may lead to network congestion and affecting service quality.

Method used

A train communication system is designed, and multiphase orthogonal amplitude modulation technology (such as 64-QAM and 16-QAM) is used to dynamically modulate data files according to the communication channel conditions to ensure that the data transmission rate and efficiency are improved under good channel conditions and avoid the increase in bit error rate under bad channel conditions. At the same time, when the data file is larger than the preset threshold, it is split into multiple data packets, transmitted in priority order, and breakpoint retransmission technology is used to handle network interrupts.

Benefits of technology

The data transmission efficiency and reliability of the train communication system are improved, ensuring that communication efficiency is improved evenly and avoiding the increase in bit error rate under different channel conditions, thereby improving communication quality.

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Abstract

The invention provides a train communication system and a train on-board monitoring system. The train communication system comprises an on-board communication subsystem and a ground communication subsystem. The vehicle-mounted communication subsystem is connected with the ground communication subsystem through a wireless communication network; when the communication channel condition judgment result is good, modulating a data file to be transmitted between the vehicle-mounted communication subsystem and the ground communication subsystem by adopting a first multiphase quadrature amplitude modulation technology; when the communication channel condition judgment result is difference, modulating a data file to be transmitted between the vehicle-mounted communication subsystem and the ground communication subsystem by adopting a second multi-phase quadrature amplitude modulation technology; the number of phases of the first multi-phase quadrature amplitude modulation technique is greater than the number of phases of the second multi-phase quadrature amplitude modulation technique. The communication efficiency is improved, and the bit error rate is prevented from being improved.
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