Time synchronization method and device

Abstract

The invention discloses a time synchronization method and device which are applied to a PTP (precision time protocol) time synchronization network so as to shorten the time spent in switching the communication port states of each device and guarantee the stability of the PTP time synchronization network. The method comprises the following steps: receiving announce messages with GM (game master) identification information by a BC (boundary clock) device; when the GM identification information in announce messages of the elder generation at the present moment is determined to be different from the GM identification information in announce messages of the elder generation at the previous moment, controlling communication ports in a non-Master state at the present moment to switch to a Master state directly; and when the GM identification information carried by the announce messages of the elder generation at the present moment is determined to be same as the GM identification information carried by the announce messages of the elder generation at the previous moment, controlling the ports in the non-Master state to enter into a Pre-master state.

Description

technical field [0001] The invention relates to synchronous communication network technology, in particular to a clock synchronization method and equipment. Background technique [0002] In the communication network, the time synchronization network is an indispensable part, and different services have different requirements for time synchronization. Among them, the most stringent requirements come from wireless communication networks, and the development of wireless technology increasingly requires high-precision time synchronization for wireless communication networks. With the rapid development of 3G network, the bearer network as the basic network of wireless communication network has begun to evolve from traditional circuit switching to packet switching. There are two types of feasible ways to realize the transmission of frequency synchronization signals and time synchronization signals in packet networks. The first is the synchronization technology based on the physic...

AI Technical Summary

Problems solved by technology

Due to the existence of the Pre-Master state, in the PTP time synchronization network, it takes too long for each device to switch the state of the communication port, which is not conducive to the stability of the PTP time synchronization network.

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