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A Clock Synchronization Simplified Information Interaction Method Applied to Wireless Sensor Networks

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 and improve work efficiency, method simple effect

Inactive Publication Date: 2018-01-16
NORTH CHINA UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A Clock Synchronization Simplified Information Interaction Method Applied to Wireless Sensor Networks
  • A Clock Synchronization Simplified Information Interaction Method Applied to Wireless Sensor Networks
  • A Clock Synchronization Simplified Information Interaction Method Applied to Wireless Sensor Networks

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Embodiment 1

[0038] In this application, the cluster head side is the master clock, which functions as a reference clock. There can be multiple nodes on the node side. image 3 Is 1 node to be synchronized, Figure 5 For a synchronization information exchange method for multiple nodes to be synchronized, the node-side clock has poor clock stability and requires clock calibration with the cluster head side. In practical applications, usually one cluster head side needs to synchronize clocks with multiple nodes. The cluster head allocates a clock synchronization time period for each node, and completes a synchronization cycle task within this time period.

[0039] Such as Figure 3-4 As shown, the following specifically describes how the invention mentioned in this application completes a complete work cycle, the method flow of a cluster head side and a node clock synchronization, the clock synchronization process in a synchronization cycle is taken as an example for illustration. The method in...

Embodiment 2

[0061] As a preference 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] Such as Figure 5 As shown, when the synchronized information interaction method applied to the clock synchronization simplified information interaction method of the wireless sensor network is applied to multiple nodes, the workload is obviously greatly simplified and the work efficiency is greatly improved.

[0063] Image 6 This is a schematic diagram of the complete effective signal curve of the cluster head side and the node side of the clock synchronization simplified information exchange method applied to the wireless sensor network according to the steps Q1-Q5, and the upper curve is the cluster The radio frequency circuit on the head side sends and receives the signal indication curve. The first wide pulse is the signal indication output by the radio frequency cir...

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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 and streamlined 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 attention and research. [0003] The current clock synchronization technology is usually divided into two types: wired and wireless. Wired clock synchronization technology is a traditional clock synchronization technology, using IEEE1588 precision clock synchronization protocol, such as figure 1 As shown, the accuracy is good and the calculation formula is simple. However, due to the limitations of line laying, difficult maintenance, and inflexible layout, in many application scenarios, it is grad...

Claims

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Application Information

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