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Clock synchronization simplified information exchange method applied to wireless sensor network

A wireless sensor and information interaction technology, applied in wireless communication, synchronization device, network topology, etc., can solve the problems of synchronization delay uncertainty, large system message overhead, etc., to reduce synchronization message overhead, improve work efficiency, and facilitate Achieved effect

Inactive Publication Date: 2015-09-16
NORTH CHINA UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the problems of the existing wireless sensor network clock synchronization technology, such as the uncertainty of the synchronization delay and the large system message overhead, the purpose of the embodiments of the present invention is to provide a clock applied to the wireless sensor network with a small synchronization delay and a small synchronization message overhead. The synchronous streamlined information interaction method, combined with the IEEE1588 precise clock synchronization protocol and the IEEE802.15.4 wireless sensor network protocol, omits at least two information sending and receiving cycles during each time synchronization process, and can be applied to distributed devices such as smart grids, distributed Synchronous Clock Establishment and Punctuality of Monitoring and Control System

Method used

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  • Clock synchronization simplified information exchange method applied to wireless sensor network
  • Clock synchronization simplified information exchange method applied to wireless sensor network
  • Clock synchronization simplified information exchange method applied to wireless sensor network

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Embodiment 1

[0038] In this application document, the cluster head side is the master clock, which acts as a reference clock, and there can be multiple nodes on the node side. image 3 is a node to be synchronized, Figure 5 It is a synchronization information interaction method for multiple nodes to be synchronized, the clock stability of the node side is poor, and clock calibration with the cluster head side is required. In practical applications, usually a cluster head needs to perform clock synchronization with multiple nodes, and the cluster head allocates a clock synchronization time period for each node, and completes a synchronization cycle task within this time period.

[0039] like Figure 3-4 As shown, the following specifically explains how the invention mentioned in this application completes a complete working cycle, the method flow of a cluster head side and a node clock synchronization, and the clock synchronization process within a synchronization cycle as an example. The ...

Embodiment 2

[0061] As an optimization of the above technical solution, this method can also be applied to a practical scenario where one cluster head side corresponds to multiple node sides to perform clock calibration.

[0062] like Figure 5 As shown, when the clock synchronization simplified information interaction method applied to the wireless sensor network is applied to multiple nodes, the workload is obviously greatly simplified and the work efficiency is greatly improved.

[0063] Figure 6 It is a schematic diagram of the complete and effective signal curves of the cluster head side and the node side of the clock synchronization streamlined information interaction method applied to the wireless sensor network according to the steps Q1-Q5 for each time synchronization provided by the embodiment of the present invention. The upper curve is the cluster Head-side radio frequency circuit sending and receiving signal indication curve, the first wide pulse is the signal indication out...

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Abstract

The invention provides a clock synchronization simplified information exchange method applied to a wireless sensor network. The method comprises steps: a cluster head side sends a message and records a time stamp t1, and a node side receives the message and records a time stamp t2; the node side sends and feeds back the message adn records a time stamp t3; the cluster head side receives the feedback message and records a time stamp t4; the cluster head side combines the time stamps t1 and t4 into a data packet and sends the data packets to the node side; according to the time stamps t2 and t3 and t1 and t4 analyzed from the data packet, the node side calculates clock offset for local clock calibration. The method is simple, synchronization time is greatly reduced, realization is convenient, an IEEE1588 accurate clock synchronization protocol and an IEEE802.15.4 wireless sensor network protocol are combined, at least two message sending and receiving times are saved during each time synchronization process, reliability is high, and the working efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of clock synchronization in a wireless sensor network, in particular to a clock synchronization simplified information interaction method applied to a wireless sensor network. Background technique [0002] Accurate clock synchronization technology is widely used in more and more technical fields such as smart grid and other distributed equipment, distributed monitoring and control systems, and has become the focus of people's attention and research. [0003] Current clock synchronization technologies are generally classified into wired and wireless. Wired clock synchronization technology is a traditional clock synchronization technology, using IEEE1588 precise clock synchronization protocol, such as figure 1 As shown, the accuracy is good and the calculation formula is simple, but due to the limitations of line laying, maintenance difficulties, and inflexible layout, it is gradually being replaced by wirele...

Claims

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Application Information

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IPC IPC(8): H04W56/00H04W84/18
Inventor 邢志强曲洪权张常年冯良
Owner NORTH CHINA UNIVERSITY OF TECHNOLOGY
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