An Improved Method for Clock Synchronization Supermaster Clock Hot Backup

A main clock and hot backup technology, applied in the field of communication network, can solve problems such as clock oscillation, achieve the effect of retaining flexibility, reducing link oscillation time, and shortening the time required for re-election

Active Publication Date: 2021-04-16
ZHEJIANG LAB
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Problems solved by technology

[0008] The purpose of the present invention is, in order to improve the stability and reliability of the time synchronization of the industrial Internet, in the abnormal situation that the super master clock in the network is unavailable, the hot backup method of the redundant clock is used to solve the problems caused by other time-aware systems in the traditional network. The clock oscillation problem caused by re-election of the super master clock

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  • An Improved Method for Clock Synchronization Supermaster Clock Hot Backup
  • An Improved Method for Clock Synchronization Supermaster Clock Hot Backup
  • An Improved Method for Clock Synchronization Supermaster Clock Hot Backup

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Embodiment Construction

[0023] Aiming at the stability problem of clock synchronization after TSN network changes, the invention proposes a new hot backup method of sub-domain division and redundant super master clock selection. The method of the present invention is realized by providing a complete set of supermaster clock failure detection and hot backup clock selection and activation schemes in a network without topology detection, and the specific steps are:

[0024] Step 1: After the network reaches stability for the first time, the time-aware system with super-master clock qualification obtains the step size from the system to the super-master clock. If the BMCA algorithm is enabled in the network, it can obtain the smallest stepsRemoved in the system port Participate in the algorithm as a step size.

[0025] And according to the network scale and characteristics, a new sub-domain division method is given. According to the distance between the time-aware system and the super-master clock, when ...

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Abstract

The invention discloses an improved time synchronization super master clock hot backup method, which belongs to the technical field of communication networks. Based on the idea of ​​the original hot backup clock, this method quickly identifies and processes the abnormalities in the time synchronization network through a new method of sub-domain division and redundant master clock selection. The method of the present invention is based on the backup clock selection method of the hot backup method in IEEE802.1AS-Rev, and is used to improve the clock jitter caused by network topology changes, and can be used to reduce the reselection of the super master clock due to topology changes in the network. clock oscillates.

Description

technical field [0001] The invention relates to the technical field of communication networks, in particular to an improved hot backup method for a clock synchronization master clock. Background technique [0002] Compared with the traditional Internet, industrial networks have higher requirements for network certainty and stability. The IEEE802.1AS protocol standard specifies the time synchronization method in the TSN network - by electing a super master clock in the network, other devices are aligned with the clock time to ensure the time error of the entire network. In this way, the error of two adjacent time-aware systems can be controlled at the ns level. [0003] IEEE802.1AS stipulates the selection rules of the super master clock in the network, that is, the BMCA algorithm. The advantages of the BMCA algorithm are: [0004] 1. The algorithm is flexible and can cope with various network topology changes; [0005] 2. The algorithm does not require prior human interve...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J3/06H04L12/24
CPCH04J3/0635H04L41/0823
Inventor 庞宏俐王延松吴少勇
Owner ZHEJIANG LAB
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