Relay Node Priority Queues for Accurate Time Synchronization
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Solution Overview
Problem
The use of time synchronization non-compatible Ethernet switches in vehicle communication systems leads to transmission delays and reduced accuracy due to the mixing of time synchronization messages with other messages in the transmission queue, causing improper synchronization between the time synchronization master and slave.
Innovation Solution
Implementing a relay node with multiple transmission queues, where one queue prioritizes time synchronization messages over others, ensuring higher transmission priority for time synchronization messages, thereby minimizing residence time and maintaining synchronization accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If time synchronization non-compatible Ethernet switches are used to reduce hardware cost, then manufacturing cost is reduced, but time synchronization accuracy deteriorates due to message mixing in transmission queues
Solution Approach 1:
The transmission queue is segmented into multiple priority levels. Time synchronization messages are placed in high-priority queues while other messages use lower-priority queues. This segmentation prevents mixing of time-critical messages with regular traffic, maintaining synchronization accuracy without requiring expensive specialized hardware switches.
2Measurement precision
If time synchronization messages are prioritized in transmission queues, then time synchronization accuracy is improved, but device complexity increases due to multiple queues and priority control
Solution Approach 1:
The relay node is designed with multi-functionality, serving both as a standard network switch and as a time synchronization bridge. By implementing priority queue management in the relay node's existing transmission control architecture, the system achieves time synchronization accuracy improvement without adding separate dedicated hardware or complex external control systems.
3Speed
If multiple transmission queues with priority control are implemented, then time synchronization message transmission speed is improved, but device complexity increases
Solution Approach 1:
The relay node automatically performs priority-based queue management for time synchronization messages without requiring external intervention or complex configuration. The system self-manages the separation and prioritization of messages through integrated queue control logic, reducing operational complexity while maintaining high transmission speed for time-critical messages.
Data Source
AI summary
A time synchronization communication system includes a plurality of nodes transmit and receive a time synchronization message via a communication network. The plurality of nodes include a first time synchronization end station, a second time synchronization end station, and a relay node that relays the time synchronization message. The relay node includes a plurality of ports that communicate with the first time synchronization end station and the second time synchronization end station, each of the plurality of ports has a plurality of transmission queues.