Time synchronization system and method with multiple synchronization domains, and cross-domain device

A technology for time synchronization and synchronizing equipment, which is applied in time division multiplexing systems, synchronization devices, transmission systems, etc., and can solve problems such as network maintenance difficulties, link asymmetric errors, and long BMC switching time.

Inactive Publication Date: 2014-03-12
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its main defects include: (1) The network hierarchical structure is not clear, which makes the later network maintenance very difficult; (2) The whole network cannot realize GM load sharing and mutual backup; (3) The network is too large, and when a fault occurs, the BMC Long switching time; (4) The synchronization link between GM and terminal equipment (such as base station) is long, which introduces more link asymmetric erro...

Method used

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  • Time synchronization system and method with multiple synchronization domains, and cross-domain device
  • Time synchronization system and method with multiple synchronization domains, and cross-domain device
  • Time synchronization system and method with multiple synchronization domains, and cross-domain device

Examples

Experimental program
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Effect test

Embodiment 1

[0127] This embodiment mainly relates to inter-domain GM backup in a peer-to-peer architecture (Master-Master inter-domain relationship).

[0128] In this embodiment, the time synchronization network is divided into multiple synchronization domains, and GM is deployed in each synchronization domain. There is a peer-to-peer relationship between synchronization domains. Inter-domain PTP packets need to be preprocessed during inter-domain intercommunication, including domain Inter-domain access control checks and inter-domain parameter mapping.

[0129] Specifically, configure the access control list on the cross-domain device, and configure the GM parameter mapping table (equivalent to the local priority function based on the synchronization domain), namely: (1) inter-domain access control, (2) inter-domain parameter mapping- Domain local precedence, specifically:

[0130] 1. If the GM in the synchronization domain is normal, the synchronization device in the domain will prefer...

Embodiment 2

[0169] This embodiment mainly involves the realization of inter-domain link backup and loop avoidance.

[0170] In the present invention, other synchronization domains are abstracted as virtual GM, and the synchronization equipment in this domain is abstracted as virtual BC; that is, the virtual BC is connected to a GM in this domain and a plurality of virtual GMs; as Image 6 shown. Its specific implementation plans include:

[0171] 1. Multiple synchronous links between domains are configured with different priorities to realize inter-domain link protection;

[0172] Among them, the inter-domain link priority is for a certain domain. For example, there are link A and link B in domain 1 and domain 2. For domain 1, the priority of link A is higher than that of link B; but for domain 2 Say, link B priority can be higher than link A;

[0173] For example, you can distinguish the priority of links by configuring different priority 2; you can switch between multiple synchronous...

Embodiment 3

[0186] This embodiment mainly involves cross-domain transfer of time source information.

[0187] The cross-domain transmission of GM information can be adopted but not limited to the following two methods:

[0188] Mode 1, domain-by-field synchronization mode (logic BC)

[0189] The Announce message carries GM parameters, including domain number, source port ID, timestamp, P1, CC, P2, GMid, hop count, and time source type; when passing across domains, the domain number needs to be modified every time a synchronization domain passes through It is the domain number of the synchronization domain currently passed; other parameters remain unchanged; note that the number of hops needs to be increased.

[0190] It should be noted that the prior art believes that the PTP domain is similar to the nature of a VPN, and the domains are isolated from each other; in fact, for the synchronization network, the concept of the PTP domain as an "area synchronization area" is more suitable.

...

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Abstract

The invention discloses a time synchronization system and a method with multiple synchronization domains, and a cross-domain device. The method comprises that: a time synchronization network is divided into multiple synchronization domains, the cross-domain devices are deployed among the synchronization domains, synchronization relations are established among the synchronization domains via the cross-domain devices, and transmission of time source information and protection of time sources are performed among the synchronization domains so that time synchronization is realized among the synchronization domains. The invention brings forward a synchronization framework based on the multiple synchronization domains. The time synchronization network is divided into the multiple synchronization domains so that inter-domain intercommunication is realized, inter-domain synchronization relations are established, cross-domain transmission and inter-domain protection of the time source information are realized and inter-domain loops are avoided. Therefore, problems in the prior art that inter-domain intercommunication and inter-domain protection cannot be realized among the multiple synchronization domains in the time synchronization network are solved.

Description

technical field [0001] The present invention relates to the technical field of packet network synchronization, in particular to a multi-synchronization domain time synchronization system, method and cross-domain equipment. Background technique [0002] With the rapid development of the 3G network, the PTP (Precision Time Protocol, Precision Time Protocol) time synchronization protocol has received more and more attention and is widely used in the packet network. Domestic and foreign operators continue to use the PTP protocol for time synchronization, and gradually replace the method of using GPS (Global Position System, Global Positioning System) for time synchronization. [0003] For the time synchronization network, the synchronization topology uses the BMC (Best Master Clock) algorithm of the PTP protocol to select the source and establish the topology. The idea is to first elect a GM (Grandmaster Clock, grandma Clock), and then complete the topology establishment accord...

Claims

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Application Information

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IPC IPC(8): H04L7/00H04J3/06
CPCH04L7/00H04J3/06H04J3/0641H04J3/0667
Inventor 张君辉何力赵洪广
Owner ZTE CORP
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