Low-overhead time synchronization method based on receivers under start network

A technology of time synchronization and star network, applied in the direction of time division multiplexing system, electrical components, multiplexing communication, etc., can solve the problems of high overhead, inefficient message interaction strategy overhead, poor real-time performance, etc., to achieve Low overhead, elimination of time stamp data transmission delay, low overhead effect

Inactive Publication Date: 2015-07-01
SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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Problems solved by technology

If a two-way time synchronization algorithm such as TPSN is used, a large amount of limited TDMA time slot resources need to be allocated additionally to transmit two-way time stamp data between the AP and the node, and the overhead is large and the real-time performance is poor.
If the RBS algorithm is used, its inefficient packet interaction strategy also costs a lot

Method used

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  • Low-overhead time synchronization method based on receivers under start network
  • Low-overhead time synchronization method based on receivers under start network
  • Low-overhead time synchronization method based on receivers under start network

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Embodiment Construction

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0030] The method of the invention is applied in the factory automation wireless network, and the network is a star network based on IEEE802.11 single-hop BSS structure.

[0031] The inventive method comprises the following steps:

[0032] Such as figure 1As shown, the factory automation wireless star network unit includes: access point AP and field node. Among them, the field nodes are responsible for collecting various parameters related to factory automation; the access point AP is responsible for forwarding the data collected by the field nodes to the main control computer through the distributed network.

[0033] All nodes in the network must maintain a local internal timer TSF (Timing Synchronization Function). In the present invention, the clock pulse of the TSF timer is set to 1us. The AP is the clock source of the entire network, ...

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Abstract

The invention relates to the industrial wireless network technology, in particular a low-overhead time synchronization method based on receivers under a star network. By sufficiently considering the application feature of an automatic star wireless network, the time synchronization method provided by the invention comprises the following steps: using a clock source device in the star network as one of receivers by using synchronized thought between the receivers based on IEEE STD 802.11-2007 standard and TDMA mechanism, comparing a receiving time value of the clock source device with that of a slave clock device so that the slave clock device can obtain an accurate time deviation value. Through the adoption of the method disclosed by the invention, the influence from transmission delay to timestamp data is eliminated, the target of precise time synchronization in the premise of high efficiency and low-overhead is realized.

Description

technical field [0001] The invention relates to industrial wireless network technology, in particular to a receiver-based low-overhead time synchronization method under a star network. Background technique [0002] Industrial wireless network technology is another hot technology in the field of industrial control after fieldbus. It is a revolutionary technology that reduces the cost of industrial measurement and control systems and improves the application range of industrial measurement and control systems. It is also a new growth point for industrial automation products in the next few years. At present, the application of industrial wireless network technology in the field of high-speed factory automation has become another focus of international wireless network technology competition after the industrial wireless network technology for process automation. Compared with the traditional wired bus technology, the factory automation wireless network not only has the advanta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J3/06
Inventor 梁炜杨雨沱张晓玲刘帅于海斌
Owner SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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