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Method and device for performing clock synchronization between equipment

A clock synchronization and equipment technology, applied in the field of network communication, can solve the problem of low precision and achieve the effect of high precision

Inactive Publication Date: 2010-09-29
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The problem to be solved by the present invention is to provide a method and device for clock synchronization between devices to overcome the defect of low precision of clock synchronization between devices in the prior art

Method used

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  • Method and device for performing clock synchronization between equipment
  • Method and device for performing clock synchronization between equipment
  • Method and device for performing clock synchronization between equipment

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Embodiment Construction

[0025] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0026] The flow of a method for clock synchronization between devices in an embodiment of the present invention is as follows image 3 shown, including the following steps:

[0027] Step s301, using the network clock protocol to perform coarse synchronization of the clocks between the local end and the peer end, and the accuracy of the coarse synchronization is accurate to second level.

[0028] Step s302, the local end initiates a two-way network delay measurement, obtains the time when the opposite end sends the response message, the time when the local end receives the response message, and the two-way frame delay, and uses half of the two-way frame delay as a single ...

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Abstract

The invention discloses a method for performing clock synchronization between equipment, which comprises the steps of: A, performing coarse synchronization on clocks between a home terminal and an opposite terminal by using a network timing protocol; B, initiating bidirectional network time delay measurement by the home terminal, and acquiring TxTimeStampb, RxTimeb and Single-Delay; C, repeating the step B for multiple times, and calculating the mean value of the TxTimeStampb, the mean value of the RxTimeb and average time delay of a unidirectional frame; D, calculating a time correction value; and E, correcting the local current time according to the time correction value. The invention also discloses a device for performing clock synchronization between equipment. The time delay between the equipment through TWO-DM function is calculated for multiple times, so the average time delay of the unidirectional frame between the equipment is acquired; and the local current time is corrected through the local current time of the equipment and the average time delay of the unidirectional frame. Therefore, the clock synchronization between the equipment is realized. The clock synchronization has high accuracy up to nanosecond scale.

Description

technical field [0001] The invention relates to the field of network communication technology, in particular to a method and device for clock synchronization between devices. Background technique [0002] The CFM (Connectivity Fault Management, connection fault management) function can effectively check, isolate and report connectivity faults on the virtual bridge LAN. A very important function in CFM management is ETH-DM (Ethernet Delay Measurement, network delay jitter calculation) function. In the Y.1731 protocol, ETH-DM is divided into TWO-DM (Two-way Delay Measurements, two-way network delay calculation) and ONE-DM (One-way frame Delay Measurement, one-way network delay calculation), which is convenient for managers When managing the network, the delay between two points and the jitter of the data link can be measured as required. [0003] The TWO-DM measurement is accomplished by sending periodic ETH-DM frames to the peer MEP (Maintenance End Point, maintenance bound...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J3/06H04L12/56
CPCH04L43/0864H04L43/0858H04L43/106H04J3/0667
Inventor 李习龙
Owner ZTE CORP
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