Network Time Synchronization Using Grandmaster Identity to Break Loops
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Solution Overview
Problem
The presence of Timing Loops in networks with network devices capable of performing time synchronization in both in-band and out-of-band modes complicates time synchronization, especially in complex networks, and existing methods to break these loops are not easily compatible with existing protocols.
Innovation Solution
A time synchronization method that includes sending out-of-band time synchronization information with a grandmaster clock identity of the first node, allowing nodes to break timing loops by synchronizing with preferred nodes based on this identity and in-band information, without introducing new parameters, using existing protocols like 1PPS+TOD and PTP.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If network devices perform time synchronization in both in-band mode and out-of-band mode, then time synchronization capability is improved, but timing loops are generated in the network
Solution Approach 1:
The patent implements a feedback mechanism where nodes send out-of-band time synchronization information including grandmaster clock identity to neighboring nodes. This feedback allows nodes to detect whether they are the grandmaster or slave, enabling them to adjust their synchronization behavior accordingly and avoid forming timing loops while maintaining dual-mode synchronization capability
Solution Approach 2:
The patent introduces dynamic role assignment where nodes can switch between master and slave roles based on the grandmaster clock identity received in out-of-band synchronization information. This dynamic adjustment allows the system to adapt to different network configurations and prevent timing loops without sacrificing synchronization versatility
2Object-generated harmful factors
If existing methods to break timing loops are implemented, then timing loops are reduced, but compatibility with existing protocols is worsened
Solution Approach 1:
The patent makes the out-of-band time synchronization information serve multiple functions: it not only provides time synchronization but also carries the grandmaster clock identity for role detection and timing loop prevention. This multi-functionality approach breaks timing loops without requiring separate protocol extensions, maintaining compatibility with existing 1PPS+TOD and PTP protocols
Data Source
AI summary
Embodiments of the present disclosure relate to the technical field of communications, and provide a time synchronization method applied to a first node provided with at least one output port connected to an input port of a second node via an out-of-band synchronization link and at least one additional output port connected to a third node via an in-band synchronization link, and the method includes: sending out-of-band time synchronization information to the second node via the out-of-band synchronization link, with the out-of-band time synchronization information including a grandmaster clock identity of the first node. The embodiments of the present disclosure further provide a time synchronization method applied to a second node, a first node, a second node, and a network.