AVB Ethernet Grandmaster Reselection Using Static Tables
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Solution Overview
Problem
Conventional in-vehicle Ethernet communication networks face challenges in rapid time synchronization, particularly when a grandmaster node is absent, leading to increased traffic and prolonged reconfiguration times due to the need for a Best Master Clock Algorithm that compares extensive reference time information across all devices.
Innovation Solution
A method and apparatus that utilize a static grandmaster table to rapidly select a new grandmaster by receiving static announcement messages, constituting a table, and updating it upon reselection, minimizing traffic and synchronization time by using a reduced set of fields and a common time source within the AVB Ethernet network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the Best Master Clock Algorithm is used to select a grandmaster when the current grandmaster is absent, then the network can maintain time synchronization, but the reconfiguration time increases and network traffic increases due to extensive comparison of reference time information across all devices
Solution Approach 1:
The patent applies preliminary action by pre-establishing a static grandmaster table containing reference time information from multiple potential grandmaster candidates during normal operation. When the current grandmaster fails, the system can immediately select a new grandmaster from this pre-prepared table without performing extensive real-time comparisons across all devices, thus reducing reconfiguration time while maintaining synchronization reliability
Solution Approach 2:
The patent applies local quality by maintaining a dedicated static grandmaster table at each network device with pre-collected reference time information from specific candidate devices. This localized storage of critical selection data allows rapid grandmaster reselection without requiring global communication and comparison across the entire network, reducing both reconfiguration time and network traffic
2Reliability
If the Best Master Clock Algorithm is used to select a grandmaster when the current grandmaster is absent, then the network can maintain time synchronization, but the network traffic increases due to extensive comparison of reference time information across all devices
Solution Approach 1:
The patent applies preliminary action by pre-establishing a static grandmaster table containing reference time information from multiple potential grandmaster candidates during normal operation. When the current grandmaster fails, the system can immediately select a new grandmaster from this pre-prepared table without performing extensive real-time comparisons across all devices, thus reducing reconfiguration time while maintaining synchronization reliability
Solution Approach 2:
The patent applies local quality by maintaining a dedicated static grandmaster table at each network device with pre-collected reference time information from specific candidate devices. This localized storage of critical selection data allows rapid grandmaster reselection without requiring global communication and comparison across the entire network, reducing both reconfiguration time and network traffic
Data Source
AI summary
A method for providing time synchronization in a node connected to an Audio Video Bridging (AVB) Ethernet communication network includes steps of receiving static announcement messages from adjacent nodes and constituting a static grandmaster table, reselecting a grandmaster with reference to the static grandmaster table when a synchronization message timer expires, and updating the static grandmaster table according to reselection of the grandmaster. The method may rapidly time synchronization in the Audio Video Bridging (AVB) Ethernet communication network and minimize network load.