Network clock synchronous device, system and method

A technology of network clock and synchronization device, applied in the field of communication, can solve the problems of high cost, difficult integration of synchronization equipment and business equipment operation and maintenance system, etc., and achieve the effect of eliminating drift.

Inactive Publication Date: 2007-09-26
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantage of this solution is that the cost is too high, and there are certain difficulties in the integration of the operation and maintenance system of the synchronization equipment and the business equipment

Method used

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  • Network clock synchronous device, system and method
  • Network clock synchronous device, system and method
  • Network clock synchronous device, system and method

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Embodiment Construction

[0034] The core idea of ​​the present invention is: obtain time from superior time server through NTP (Network Transfer Protocol), because time server does not have time drift, what NTP introduces by the change of network responsiveness in IP network transmission process is only jitter, and local oscillator The drift is mainly generated, and its own jitter can be ignored. The drift of the local oscillator can be calculated according to the time information obtained at different times, and the drift of the local clock can be eliminated by adjusting the frequency adjuster to finally meet the clock synchronization requirements of business equipment.

[0035] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further elaborated below in conjunction with the accompanying drawings.

[0036] As shown in Fig. 3, it is the network clock synchronization system of the present invention. The network clock synchro...

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Abstract

The invention discloses a network time synchronization device, system and method, the method includes following steps: step A: the business device sends the time request to at least one time sever at intervals of time; step B: compares the time samples returned by the time sever, choose the time sample to calculate the time difference between the local time and the time sever; step C: according to obtained time difference data to adjust the frequency regulator in the business device, and locks the time of superior time sever. Using the invention, it can obtain the time information of superior time sever via the transmission network, and according to the time information obtained in different time it can calculate the shift of local oscillator, and it can eliminate the local time shift by adjusting the frequency regulator to satisfy the requirement for the time of business device.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a network clock synchronization device, system and method. Background technique [0002] Good network synchronization performance has a great impact on telecommunications services, and poor synchronization often brings a series of problems; in wireless networks, synchronization problems are particularly important, such as poor voice quality, high call drop rate, low handover success rate, and inability to access And many other problems are mostly related to poor network synchronization performance. The transmission network mode is constantly evolving, from the initial TDM (Time Division Multiplexing, time division multiplexing) to ATM (Asynchronous Transfer Mode, asynchronous transfer mode) to IP. Since the terminal devices generally located in the network, such as base stations, have different specific access methods, and the number of terminals is relatively large. Cons...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L7/00H04L7/027
CPCH04J3/0644
Inventor 张庆
Owner HUAWEI TECH CO LTD
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