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Time synchronization method and system

A time synchronization and time technology, applied in the field of synchronization, can solve problems such as increased delay measurement error, branch unit output clock jump, synchronization time information offset, etc., to achieve the effect of improving accuracy and reducing transmission drift.

Active Publication Date: 2008-08-20
HUAWEI TECH CO LTD
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Problems solved by technology

In this way, after the signal of the branch circuit passes through the desynchronization circuit of the master and slave clock devices, a phase transition process will occur, so the output clock of the branch circuit unit will jump, resulting in a deviation of the synchronization time information
At the same time, since the drift of the SDH 2Mbits branch can reach 18μs, the accuracy of time synchronization of this method is low
In addition, the free time slot for writing time request information in the receiving and sending 2Mbits service data streams of the slave clock device side is the same, but there may be a large deviation in phase between the receiving and sending time slots, which will cause Increased delay measurement error, resulting in reduced accuracy of time synchronization
Therefore, this method is not suitable for applications that require high time synchronization accuracy, such as accuracy below 10 μs

Method used

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Embodiment Construction

[0027] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] The time synchronization method provided by the embodiment of the present invention is that the master node sends synchronization time information to the slave node through the segment overhead; the slave node adjusts its own time to achieve time synchronization according to the synchronization time information carried in the segment overhead received.

[0029] The method for time synchronization in the embodiment of the present invention will be described in detail below by taking the SDH system as an example.

[0030] figure 2 Shown is a frame structure diagram of an SDH signal in the prior art, such as figure 2 As shown, the SDH signal, that is, the Synchronous Transport Module (STM-N, Synchronous Transport Module N), consists of 9×270×N bytes, and N is consistent with the N in STM-N, indicating that the signal consists of N sync...

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Abstract

The present invention discloses a time synchronism method, includes master node transmits synchronization time information to sub-node by segment spending; sub-node adjusts self time to reach time synchronism by receiving synchronization time information carried by sect spending. The present invention also discloses a time synchronism system. Time synchronism accuracy can be improved by using the invention.

Description

technical field [0001] The present invention relates to synchronization technology, in particular to a time synchronization method and system. Background technique [0002] In a time synchronization system, if the time synchronization accuracy cannot meet the system's accuracy requirements, the time synchronization system may not work properly. [0003] For example, Code Division Multiple Access (CDMA, Code Division Multiple Access) wireless base station is a network-wide clock synchronization system, all mobile terminals (MS, Mobile Station) and base transceiver stations (BTS, Base Transceiver Station) in the system It needs to be synchronized with the base station controller (BSC, BaseStation Controller) in time, that is, all terminal equipment and base station equipment in the CDMA system must keep the same time absolutely, so as to ensure the normal operation of MS switching, data transmission and other services. If the MS, BTS and BSC are not synchronized in time, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/26H04B7/216H04J3/06
CPCH04B1/707H04J3/065H04J3/1611
Inventor 张庆
Owner HUAWEI TECH CO LTD
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