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Method and device for selecting time synchronization sources

A technology of time synchronization and reference time, which is applied in the field of communication, can solve problems such as unclear source selection mechanism, and achieve the effect of improving flexibility and rationality

Active Publication Date: 2013-03-06
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The source selection and protection mechanism (i.e. the extended BMC algorithm) of carrier-class time synchronization is still under study, and it is one of the key issues of G.8275.1, but the specific source selection mechanism has not yet been clarified

Method used

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  • Method and device for selecting time synchronization sources
  • Method and device for selecting time synchronization sources
  • Method and device for selecting time synchronization sources

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Select the clock source according to the priority of the parameters. The priority of the parameters is sorted from high to low: time synchronization link symmetry index, PRC quality level, PRTC quality level, whether PRC and PRTC are located on the same device, port clock priority of the device Parameters, packet delay change indicators.

[0064] That is to say, it is considered that the symmetry index of the synchronization link is the most important, and the symmetry indexes of all the synchronization links are compared first, and the bidirectional physical link carrying the time synchronization message is preferentially selected as a consistent synchronization link. If multiple synchronization links have the same symmetry index, compare the PRC quality levels of the multiple synchronization paths, and select the path with the highest PRC quality level as the synchronization path. If there are multiple paths with the same PRC quality level, compare their PRTC quality ...

Embodiment 2

[0066] Set weights for each parameter, calculate the sum of the weights of each clock source, and select the clock source with the highest sum of weights.

[0067] For example, take the four parameters of PRC quality level, PRTC quality level, whether PRC and PRTC are located on the same device, and the port clock priority parameter of this device as an example: different weight points can be assigned to the quality level of the PRC, and the higher the quality level The higher the weight score, for example: QL-PRC has a weight of 4, QL-SSU-A has a weight of 3, QL-SSU-B has a weight of 2, and QL-SEC / QL-EEC1 has a weight of 1 , the weight of QL-DNU is divided into 0. Then assign different weight points to the quality level of the PRTC. The higher the quality level, the higher the weight point. For example, the weight point of the PRTC with a precision of 25ns is 5, the weight point of a PRTC with a precision of 100ns is 4, and the precision is . The weight of the 250ns PRTC is ...

specific Embodiment 1

[0072] according to figure 2 A specific implementation method of this program is described.

[0073] In step 201, the GM device obtains the respective quality levels and positional relationships of the PRC and PRTC it is connected to, writes them into an announce message and sends it.

[0074] Step 202, the BC or SC device judges whether the announce message indicates that the upstream BC device has failed to lock the clock source, and if so, the BC or SC device does not select the GM and time synchronization path corresponding to the announce message, otherwise execute the step 203.

[0075] Step 203, the BC or SC device adds the port clock priority information configured by itself according to the three parameter information written by the GM carried in the announce message, and the symmetry index and PDV index of the synchronous link detected by itself, Source selection or protection switching is performed using the same source selection rules (relative order method or w...

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Abstract

The invention discloses a method and a device for selecting time synchronization sources. The method includes: allowing a boundary clock device or a slave clock device to select sources according to any parameters of clock sources, such as primary reference clock source quality level, primary reference time source quality level, co-existence or no co-existence of primary reference clock sources and primary reference time sources in a device, device port clock priority parameter, message delay change indicator, and time synchronization link symmetry indicator. The method and device are applicable to time-synchronized source selection schemes, multiple relevant parameters can be fully utilized to select sources, and accordingly source selection reasonability is improved. A protection mechanism is also achieved for a time synchronization network and used for protecting switching, certain special faults of the time synchronization network can be timely sensed and treated, interaction between a clock synchronization network and the time synchronization network is supported, flexibly in switching the time synchronization network is improved and time synchronization performance is protected from influence.

Description

technical field [0001] The present invention relates to the communication field, in particular to a time synchronization source selection method and device. Background technique [0002] With the rapid development of mobile communication network technologies (including 3G and 4G technologies), clear and high-precision requirements are put forward for time synchronization of mobile backhaul networks based on Packet Transport Network (PTN) technology. [0003] The current time synchronization is mainly realized through the IEEE1588v2 protocol, also known as the PTP protocol. The source selection and protection mechanism of the PTP protocol are realized through the Best Master Clock (BMC for short) algorithm. [0004] In the telecommunications network, there is already a standard specification for frequency synchronization using IEEE 1588v2 - G.8265.1. Its source selection and protection mechanism (extended BMC algorithm) still uses the traditional Synchronous Digital Hierarch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J3/06
CPCH04J3/0667H04J3/0641
Inventor 夏靓赵洪广
Owner ZTE CORP
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