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Method and system for realizing high precision time synchronization among SDH equipment

A technology for SDH equipment and time synchronization, which is applied in the field of communication and can solve problems such as the inability to synchronize high-precision time of SDH equipment

Inactive Publication Date: 2009-11-18
ZTE CORP
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  • Abstract
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  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a method and system for realizing high-precision time synchronization between SDH equipment, so as to solve the problem that the existing high-precision time synchronization between SDH equipment cannot be carried out, and get rid of the dependence on GPS

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  • Method and system for realizing high precision time synchronization among SDH equipment
  • Method and system for realizing high precision time synchronization among SDH equipment
  • Method and system for realizing high precision time synchronization among SDH equipment

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Embodiment Construction

[0085] The technical solution of the present invention will be described in more detail below with reference to the drawings and embodiments.

[0086] The basic idea of ​​the present invention is: the SDH device as the slave clock and the SDH device as the master clock use the idle bytes of the segment overhead of the SDH frame to interact with PTP messages, and after calculating the time difference with the master clock, use the time difference to correct The slave clock completes the high-precision time synchronization between SDH devices.

[0087] Such as figure 1 As shown, in the SDH frame structure, the length of each frame of STM-N (Synchronous Transport Module, N=1, 4, 16, 64) is 9 rows and 270×N columns. And each frame is composed of SOH (Section Overhead, section overhead), PAYLOAD (information payload, including POH (Path Overhead, channel overhead)), and AU PTR (Administrative Unit Pointer).

[0088] The frame header overhead of STM-N is 9×N columns. In the frame heade...

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Abstract

A method for realizing high precision time synchronization among synchronous digital hierarchy (SDH) equipment includes the step: a piece of SDH equipment as a slave clock and a piece of SDH equipment as a master clock use the idle bytes in section overhead of an SDH frame to conduct the interaction of PTP messages, the time difference between the slave clock and the master clock is calculated and the time difference is utilized to calibrate the slave clock. And a system for realizing high precision time synchronization among SDH equipment includes: the SDH equipment as the slave clock and the SDH equipment as the master clock. The slave clock uses the idle bytes in section overhead of the SDH frame to conduct the interaction of PTP messages with the master clock and calculates the time difference with the master clock, and then the time difference is used to calibrate the slave cock. The master clock uses the idle bytes in section overhead of the SDH frame to conduct the interaction of PTP messages with the slave clock. The adoption of the method and the system can ensure that the high precision time synchronization among the SDH equipment is realized and satisfy the requirements of all mobile communication systems at the present stage.

Description

Technical field [0001] The present invention relates to the field of communications, in particular to a method and system for realizing high-precision time synchronization between SDH (Synchronous Digital Hierarchy) devices. Background technique [0002] In mobile communications, it is required that the frequency or time deviation between base stations must be kept within a certain range, which is the so-called synchronization, so as to avoid the phenomenon of users being dropped when switching between base stations and affecting users. For GSM (Global System for Mobile Communications, Global System for Mobile Communications) / WCDMA (Wideband Code Division Multiple Access, Wideband Code Division Multiple Access) networks, only the frequency synchronization between base stations needs to be ensured; for CDMA (Code Division Multiple Access) , Code Division Multiple Access) / TD-SCDMA (Time Division-Synchronous Code Division Multiple Access, Time Division Synchronous Code Division Mult...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J3/06
CPCH04J3/065
Inventor 赵凯邵贵阳徐正霞
Owner ZTE CORP
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