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Wireless meshed network low-spending high-precision time synchronization process for industry monitoring

A technology of time synchronization and time, which is applied in the direction of synchronization devices, data exchange networks, and communication between multiple stations. It can solve the problems that the synchronization accuracy cannot meet the needs of industrial applications, and achieve the effect of low overhead and improved accuracy.

Active Publication Date: 2008-05-07
SHENYANG ZHONGKE AOWEI SCI & TECH CO LTD
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Problems solved by technology

[0009] Aiming at the problem that low overhead is required for battery power supply, and the synchronization accuracy achieved by a relatively low synchronization cycle is difficult to meet the needs of industrial applications, the purpose of this invention is to propose a low-overhead high-precision time synchronization method for wireless Mesh networks for industrial monitoring

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  • Wireless meshed network low-spending high-precision time synchronization process for industry monitoring
  • Wireless meshed network low-spending high-precision time synchronization process for industry monitoring
  • Wireless meshed network low-spending high-precision time synchronization process for industry monitoring

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the embodiments and accompanying drawings.

[0027] The present invention specifically operates as follows:

[0028] 1) Record the precise time stamp of message sending and receiving at the MAC layer: select sending node A in the network (that is, a node that can accurately obtain physical time, such as a gateway node) as the time source, and use one-way transfer mode and fixed time Interval (such as: the present embodiment is 30 minutes), periodic broadcast time synchronization beacon (time synchronization beacon TSB); In order to improve the synchronization accuracy, record the global timestamp carried by the time synchronization beacon at the MAC layer;

[0029] 2) Construct a time stamp pair: after receiving the time synchronization beacon issued by the time source, the receiving node B (that is, the node in the broadcast domain of the time source) records the arrival time of the time synchron...

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Abstract

The invention belongs to the field of wireless network communication, in particular to a high-precision time synchronization method for realizing a node and a time reference source in a wireless mesh network. The main technical points are: record the precise time stamp of message sending and receiving at the MAC layer; the receiving node that needs to be synchronized collects the time synchronization beacons periodically released by the time source, and after receiving several time synchronization beacons, uses statistical methods to establish The relational equation of the local time and the global time at the time synchronization beacon sending node eliminates the influence of the clock crystal frequency offset on the time synchronization accuracy; during the operation of the network, the parameters of the relational equation are updated online. By adopting the method of the invention, the time uncertainty in the synchronization process can be eliminated to the greatest extent, and the synchronization overhead can be reduced.

Description

technical field [0001] The invention belongs to the field of wireless network communication, in particular to a high-precision time synchronization method for realizing a node and a time reference source in a wireless mesh (Mesh) network. Background technique [0002] Mesh is a new type of wireless network structure that has emerged in recent years. In this network structure, each node can act as a router and form a multi-hop wireless communication network through cooperative transmission with multiple nodes. The advantages of low-cost, robust, flexible and easy-to-use Mesh network make it one of the main topologies of wireless communication systems for industrial monitoring applications. [0003] Network time synchronization is the basis of cooperative transmission and one of the key technologies for building wireless mesh networks. The time synchronization of wireless Mesh networks for industrial monitoring faces the following challenges: 1. The low-cost requirements of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L7/00H04L12/26H04L29/08H04B7/26
Inventor 曾鹏于海斌尚志军
Owner SHENYANG ZHONGKE AOWEI SCI & TECH CO LTD
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