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Automatic protection switching method for main and auxiliary time sources

An automatic protection switching, time source technology, applied in electrical components, wireless communications, synchronization devices, etc., to improve performance self-healing ability and reduce recovery time.

Active Publication Date: 2014-07-30
BEIJING UNIV OF POSTS & TELECOMM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is: in the time synchronization network, when the working reference time source node fails or performance drops, how to quickly switch to the backup reference time source to realize the fast automatic protection switching of the relevant time synchronization link

Method used

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  • Automatic protection switching method for main and auxiliary time sources
  • Automatic protection switching method for main and auxiliary time sources
  • Automatic protection switching method for main and auxiliary time sources

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Embodiment 1

[0044] The new working reference time source node directly transmits the time synchronization information to the original working reference time source node through the first backup synchronization link, and the original working reference time source node distributes the time synchronization information to the downstream slaves according to the synchronization link before switching clock node. Such as Figure 5 As shown, it is a schematic diagram of a reference time source switching and related time synchronization link switching provided in this embodiment. The actual time synchronization bearer network can be a Synchronous Digital Hierarchy (SDH), Optical Transport Network (OTN) or Packet Transport Network (PTN) etc. Figure 5A is the working reference time source node, BITS_W injects time information, and provides time synchronization information for B slave clock node and C slave clock node through link 1; D is the backup reference time source node, BITS_P injects time in...

Embodiment 2

[0046] The new working reference time source node can distribute time synchronization information to downstream slave clock nodes through the planned backup synchronization link connected to it, that is, the second backup synchronization link. Such as Figure 6 As shown, it is a schematic diagram of a reference time source switching and related time synchronization link switching provided in this embodiment, and the actual time synchronization bearer network may be SDH, OTN, or PTN. Figure 6 A is the working reference time source node, BITS_W injects time information, and provides time synchronization information for B slave clock node and C slave clock node through link 1; D is the backup reference time source node, BITS_P injects time information, A and After D switches, D provides time synchronization information for slave clock nodes B and C through link 2. At this time, link 2 is a short path from D to B and C.

[0047] The purpose of the two switching strategies in the...

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Abstract

The invention discloses an automatic protection switching method for main and auxiliary time sources. The automatic protection switching method comprises the steps of: S1. sending a switch request to a backup reference time source node by an original operational reference time source; S2. switching the backup reference time source node to a new operational reference time source and judging the type of the switching request, if the switching request is the reference time source switching, executing S3 and if the switching type is synchronization link switching, executing S4; S3. starting a first backup synchronization link between two time source nodes by the original operational reference time source node and sending time synchronization information to a downstream auxiliary clock node through the link and the original synchronization link by the new operational reference time source node; and S4. starting a second backup synchronization link of the downstream auxiliary clock node by the new operational reference time source node and sending the time synchronization information to the downstream auxiliary clock node through the link. According to the automatic protection switching method, the reference time source and relative time synchronization link can be switched rapidly, so that the recovery time of the time synchronization information is shortened effectively.

Description

technical field [0001] The invention relates to the technical field of automatic protection switching of a time synchronization network, in particular to a method for automatic protection switching of active and standby time sources. Background technique [0002] The time synchronization network provides time synchronization information to the telecommunication network, so that the time of the telecommunication equipment is consistent. For 3G systems using TDD, such as CDMA2000, TD-SCDMA and the corresponding versions of WiMAX, strict time synchronization is required in technologies such as preventing interference between time slots, detecting adjacent cells and switching cells. The traditional time synchronization solution configures each base station with Global Positioning System (GPS) or Beidou Satellite Navigation System (BD) equipment. However, considering cost and other aspects, it has become a development trend to use ground transmission networks to transmit time syn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W24/04H04W56/00
Inventor 王立芊杨鹏飞陈雪闫峥孙曙和陈江峰
Owner BEIJING UNIV OF POSTS & TELECOMM