RSSP-I Dual-System Synchronization for Consistent Safety Data
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Solution Overview
Problem
Existing RSSP-I safety communication protocols fail to maintain data consistency between active and standby systems, leading to inefficient utilization of standby system bandwidth, as data sent by the standby system is not subjected to safety checking and is primarily used for heartbeat data, wasting channel resources.
Innovation Solution
Implementing a dual-system synchronization method where both active and standby machines use 0×01 for protocol interaction types in message headers and 0×82 for message types, and employing redundancy technology to ensure identical data copies are sent by both systems, with the standby system sending data only after validation by the receiving end.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the standby system sends heartbeat data without safety checking, then the system can maintain simple operation and quick response, but the bandwidth utilization of the standby system channel is wasted
Solution Approach 1:
The patent changes the protocol interaction type parameter from 0×02 (heartbeat mode without safety checking) to 0×01 (safety data mode with synchronous time sequence correction) for the standby system. This parameter change enables the standby system to send safety-checked data instead of simple heartbeat data, thereby improving bandwidth utilization while maintaining operational simplicity through automated safety mechanisms
2Device complexity
If the active and standby systems send different data, then the system can maintain simple data transmission protocols, but the data consistency between systems is compromised
Solution Approach 1:
The patent implements a copying mechanism where the standby system receives and stores copies of safety data from the active system, then sends these copied data packets with protocol interaction type 0×01. This ensures both systems transmit identical safety-checked data, maintaining data consistency while the receiving end validates authenticity through synchronous time sequence correction, thus preserving reliability without significantly increasing protocol complexity
3Productivity
If the standby system sends safety-checked data instead of heartbeat data, then the bandwidth utilization is improved, but the system complexity increases
Solution Approach 1:
The patent applies preliminary action by having the standby system pre-receive and store safety data from the active system before needing to transmit. The data is prepared in advance with proper formatting and safety checking already performed, so when the standby system needs to send data, it can do so immediately with protocol interaction type 0×01. This reduces real-time processing complexity while improving bandwidth utilization
Data Source
Figure 1~2
AI summary
A Railway Signal Safety Communication Protocol I (RSSP-I) safety communication method based on dual-system synchronization belongs to the technical field of safety communication, and includes: adopting 0×01 for both main machine and standby machine protocol interaction types in a message header of a Real-time Safety Data (RSD) message, and adopting 0×82 for both message types of a main machine and a standby machine; changing data sent by the main machine and the standby machine into a plurality of copies of completely same data by adopting a redundancy technology; and sending the plurality of copies of completely same data to a receiving end by the main machine and the standby machine. According to the present disclosure, reliability and safety of data transmission are improved.