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Method and related systems and modules for synchronizing clocks by separately transmitting first and second data via at least one time distribution protocol

A data and time technology, applied in the field of data packet network), can solve the problems of client clock stability and lack of time accuracy

Inactive Publication Date: 2015-08-19
ALCATEL LUCENT SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, the lack of stability of low-cost client clocks can adversely affect time accuracy during reconfiguration times / delays of synchronous topologies

Method used

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  • Method and related systems and modules for synchronizing clocks by separately transmitting first and second data via at least one time distribution protocol
  • Method and related systems and modules for synchronizing clocks by separately transmitting first and second data via at least one time distribution protocol

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Experimental program
Comparison scheme
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Embodiment Construction

[0037] The present invention aims to provide a method and related system (S) for synchronizing a client clock (CC) of a client communication node (N2) with a master clock (MC) in a data packet network.

[0038] In the following description, by way of example only, a packet data network (or PSN) is considered to be a mobile network comprising communication nodes, such as base stations, to be synchronized. However, the invention is not limited to this type of data packet network. In fact, the invention relates to any type of data packet network or packet switched network (PSN).

[0039] As described above, the present invention provides a method for synchronizing a client clock (CC) of a client communication node (N2) with a master clock (MC) in a data packet network comprising communication nodes.

[0040] figure 1 A part of a data packet network is shown, which includes a source communication node N1, a client communication node N2 and five intermediate communication nodes I...

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PUM

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Abstract

A method is intended for synchronizing a client clock (CC) of a client communication node (N2) with a master clock (MC) in a data packet network. This method comprises the steps of: i) transmitting first data representative of timing information of the master clock (MC) from a source communication node (N1) to the client communication node (N2) via a time distribution protocol, ii) transmitting second data representative of a frequency reference correlated to the timing information from a chosen communication node (N3) to the client communication node (N2) via a time distribution protocol, and iii) differentiating the transmitted first and / or second data into the client communication node (N2) to synchronize the client clock (CC) with the master clock (MC) by means of the timing information and / or frequency reference represented by the differentiated first and second data.

Description

technical field [0001] The present invention relates to data packet networks (or packet switched networks (PSNs)), more precisely clock synchronization in data packet networks. Background technique [0002] As is known to those of ordinary skill in the art, certain (strict) client applications running on client communication nodes require precise clock references to function correctly. This is especially the case for certain mobile network applications (eg for base station synchronization). [0003] This precise clock reference can be provided by an accurate and highly stable client clock installed on the considered client communication node. However, such client clocks are usually very expensive. [0004] Another approach consists in transmitting timing information representing a very precise master clock from a source communication node to a client communication node (connected to a data packet network), e.g. via a time distribution protocol such as IETF NTPV4 (Network T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J3/06
CPCH04J3/0664H04J3/0641H04L7/00H04J3/06H04L9/40
Inventor M·勒帕莱克J·L·费兰特
Owner ALCATEL LUCENT SAS