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Method, equipment and system for clock synchronization of access network

A technology of clock synchronization and access network, which is applied in the field of communication, can solve the problems of synchronization message delay uncertainty, etc., and achieve the effect of precise time synchronization

Active Publication Date: 2013-03-06
DATANG MOBILE COMM EQUIP CO LTD
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Problems solved by technology

The processing delay of these two layers will introduce the uncertainty of synchronization message delay

Method used

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  • Method, equipment and system for clock synchronization of access network
  • Method, equipment and system for clock synchronization of access network
  • Method, equipment and system for clock synchronization of access network

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Embodiment Construction

[0036] In order to enable those skilled in the art to better understand the solutions of the embodiments of the present invention, the embodiments of the present invention will be further described in detail below in conjunction with the drawings and implementations.

[0037]The access network clock synchronization method in the embodiment of the present invention is also based on the four-message mechanism, but different from the prior art, in order to ensure that the slave clock side in the access network can accurately measure the sending and arrival time of the synchronization management message , to realize accurate master-slave clock time synchronization, the method of the embodiment of the present invention adopts ATM cells to directly transmit synchronization management messages, instead of using Ethernet MAC frames, and stamping time stamps at positions close to the physical layer, also That is to say, the embodiment of the present invention sets the time stamp at the ...

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Abstract

The invention discloses a method, equipment and a system for clock synchronization of an access network. The method comprises the following steps that: an ATM cell transmits a synchronous management message in a mode of asynchronous transmission, and sets a time mark on the ATM layer, wherein the synchronous management message comprises a synchronous message, a follow message, a delay request message and a delay response message; according to the time mark of the synchronous management message, the clock different between a master clock and a slave clock of the access network is obtained by computation; and according to the clock difference, the slave clock and the master clock are synchronized by adjusting the slave clock. By the invention, the time of the master clock and the slave clock can be precisely synchronized.

Description

technical field [0001] The invention relates to a clock synchronization technology in the communication field, in particular to a method, device and system for clock synchronization of an access network. Background technique [0002] In the field of communication, the concept of "synchronization" refers to the synchronization of the clock frequency of each node in the network, and its error should comply with the relevant standards. [0003] At present, in the communication network, the frequency synchronization problem has basically been solved, but the time synchronization has not been well solved. Time synchronization refers to the synchronization of the time and time interval of the clocks of each node in the network and the clocks of each application interface connected through the network with the Coordinated Universal Time (UTC). The time synchronization network is the basis for ensuring time synchronization. The time synchronization network can be formed in a wired ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L7/00H04L12/951H04L47/43
CPCH04J3/0667
Inventor 谢子阳刘贤
Owner DATANG MOBILE COMM EQUIP CO LTD
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