LTE Train Control Redundancy with Four IP Channels
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Solution Overview
Problem
The LTE wireless communication technology lacks redundancy, leading to unsuitability for SIL4-level safety requirements in train control systems, experiences uneven network coverage and instability, and is influenced by other user usage patterns, hindering its application in moving block train control systems.
Innovation Solution
A dual-radio, dual-antenna redundancy system is implemented using different operator networks, establishing four IP channels with Subset037 and SM4 cryptography for secure communication, ensuring redundancy and stability even in single-failure scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If LTE public network is used for train control system, then data rate and coverage are improved, but redundancy and reliability deteriorate
Solution Approach 1:
The system divides the communication architecture into multiple independent segments: dual radios (Radio 1 and Radio 2), dual antennas (Antenna 1 and Antenna 2), and multiple IP channels (IP channel 1, IP channel 2, IP channel 3, IP channel 4). This segmentation ensures that failure of one segment does not compromise the entire system, providing redundancy while maintaining high data rates through LTE technology.
Solution Approach 2:
The system implements prior cushioning by establishing redundant communication paths before failures occur. The dual-radio dual-antenna configuration with four independent IP channels provides pre-configured backup pathways, ensuring that if one radio or antenna fails, communication continuity is maintained without interruption to train control operations.
2Area of stationary object
If single-standard public network is used, then network coverage is improved, but network stability deteriorates
Solution Approach 1:
The communication system is segmented into multiple independent radio interfaces and IP channels, allowing diversification of network standards and operators. This enables the system to leverage multiple public networks simultaneously, expanding coverage while mitigating the instability of any single network through redundant pathways.
3Device complexity
If LTE public network is used, then system complexity is reduced, but security level deteriorates
Solution Approach 1:
The system achieves SIL4 safety level by segmenting the communication into four independent IP channels through dual-radio dual-antenna configuration. This segmentation provides inherent redundancy that meets safety requirements without requiring complex additional safety systems, as the independent channels naturally provide fault tolerance.
Solution Approach 2:
The system changes the parameter of communication redundancy from single-channel to multi-channel (four IP channels), transforming the LTE public network into a safety-critical system. This parameter change enables the use of standard LTE technology while achieving the required SIL4 safety level through quantitative redundancy.
Data Source
AI summary
The present invention relates to an LTE public network redundant system in a moving-block train control system and a communication method. The system is used for realizing communication connection between a vehicle-mounted device and a trackside device, characterized in that the LTE public network redundant system comprises a first radio station, a second radio station, a first antenna and a second wire, wherein the vehicle-mounted device is connected to the first radio station and the second radio station at the same time, the first radio station is connected to both the first antenna and the second wire; and the second radio station is connected to both the first antenna and the second wire, so that four IP channels are constructed. Compared with the prior art, the present invention has the advantages of ensuring the redundancy and security of wireless communication, etc.