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Method, device and system for time synchronization

A time synchronization and time technology, applied in the field of communication, can solve the problems of inability to recover time information and the influence of ACR recovery clock accuracy, and achieve the effect of ensuring accuracy and precise time synchronization

Active Publication Date: 2018-05-04
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, IEEE 1588ACR can only recover clock information, not time information, and the quality of ACR recovered clock is very dependent on the performance of the DOCSIS bearer network, such as transmission delay, jitter, packet loss rate and bandwidth, all of which can affect the accuracy of ACR recovered clock cause serious impact

Method used

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  • Method, device and system for time synchronization
  • Method, device and system for time synchronization
  • Method, device and system for time synchronization

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Embodiment Construction

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0036] figure 1 It is a flow chart of Embodiment 1 of the time synchronization method of the present invention. The method provided in this embodiment can be executed by CMTS equipment, such as figure 1 As shown, specifically, the method provided in this embodiment may include:

[0037] S101. The CMTS device obtains a data stream from a service...

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Abstract

Provided are a time synchronization method, apparatus and system. The method comprises: a CMTS device acquires a data flow from an SNI, extracts a time message from the data flow including the time message and a data message, then sends the time message to a CM via a signalling channel and sends the data message to the CM via a data channel, wherein the signalling channel and the data channel are different in working frequency points. Since the signalling channel transmitting the time message has a fixed processing time delay, there is no time delay variation, and precision of time information in the transmitted time message is guaranteed, so that precise time synchronization in a DOCSIS network can be realized.

Description

technical field [0001] Embodiments of the present invention relate to communication technologies, and in particular to a method, device and system for time synchronization. Background technique [0002] The evolution of mobile networks from macro base stations to micro base stations will become the mainstream construction mode of 4G networks in the future, and cable TV operators have extensive coverage and high-bandwidth external cable factory (Cable outside plant) resources, and are conducting broadband access in the wild It has extensive and mature engineering applications in terms of equipment installation, so it is the best bearer backhaul network for indoor or outdoor deployment of micro base stations. [0003] The current mainstream technology for cable access to the network is Data Over Cable Service Interface Specifications (DOCSIS for short). The communication process with the cable modem terminal (Cable Modem, referred to as: CM) is: the data frame received by the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B3/54H04L7/027
CPCH04B3/54H04L7/027
Inventor 张利
Owner HUAWEI TECH CO LTD