Method, apparatus and system for time synchronization

Abstract

The embodiment of the invention discloses a method, a device and a system for time synchronization, relates to the communication field, and can ensure that a slave node can quickly achieve time synchronization with a host node when local time of the host node is adjusted. The method for time synchronization comprises the following steps: receiving a time adjustment message transmitted by the host node, wherein the time adjustment message carries time adjustment information and a time adjustment serial number of the host node; and synchronously adjusting the local time of the slave node according to the time adjustment information and the time adjustment serial number. The other method for time synchronization comprises the following steps: detecting that whether the local time of the host node is adjusted or not; and sending the time adjustment message to the slave node when adjustment occurrence of the local time of the host node is detected. The time adjustment message carries the time adjustment information and the time adjustment serial number of the host node.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to a time synchronization method, device and system. Background technique [0002] With the development of wireless 3G (3rd Generation, third-generation digital communication), the need for frequency and phase synchronization between base stations becomes more and more urgent. In order to realize the end-to-end time synchronization of the mobile bearer network, the IEEE1588 standard is introduced into the communication field, and by defining the PTP 1588 (Precision Time Protocol, Precision Time Protocol) message, the single-node nanometer-level time accuracy is realized. Within the coverage of the network, the ingress and egress ports of each network device add time stamps of the time of entering and leaving the network device to the PTP 1588 message, so as to realize time synchronization between base stations. [0003] The time synchronization method in the prior art ...

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Problems solved by technology

[0004] In the process of realizing the above-mentioned time synchronization, the inventors found at least the following problems in the prior art: each time the slave node receives a time stamp synchronization message, by obtaining the time adjustment amount of the master node, it is judged whether it is necessary to adjust the local time of the slave node. Time, the calculation is complex and consumes a lot of system resources. At the same time, in the process of calculating the synchronization time adjustment of the master node, the time adjustment of the master node is determined through information interaction with the master node, which increases the transmission of interactive information on the transmission link. time, prolonging the acquisition time of the time adjustment amount, causing the slave node to fail to achieve time synchronization with the master node in time

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