A Self-Synchronization Method for Wireless Sensor Networks

Abstract

The invention relates to a self-synchronizing method of a wireless sensor network. The self-synchronizing method is characterized in that on the basis of the conception of distributed diffusion, a group of main nodes and diffusion nodes for local diffusion execution are selected dynamically at each round according to the node energy and distribution and the average transmission delay; node average clocks of the main node region are diffused to neighboring nodes within the hop count n; the neighboring nodes average all the received average clocks of the main node region to update local clocks; and different main nodes and diffusion nodes are selected at many rounds and mutual diffusion is executed, and the node clocks are synchronized to the average block of the network node approximately. According to the invention, synchronously consumed energy is dispersed to all nodes of the network. The adaptation is good, the reliability is high, and the algorithm is simple. The synchronization parameter can be adjusted according to the network application demand; and thus the method is especially suitable for synchronization of a large-scale sensor network.

Description

technical field [0001] The invention relates to a self-synchronization method of a wireless sensor network, belonging to the technical field of wireless sensor networks. Background technique [0002] Many sensor network applications require the entire network node to maintain a relatively consistent time, especially in the application of large-scale sensor networks such as target tracking and intrusion monitoring. Data fusion can make judgments and predictions on the position and speed of moving targets; energy saving is a key issue in the application of sensor networks. When designing the MAC layer protocol of the network, from the perspective of improving energy efficiency, the clock synchronization of the entire network It also has an important role in energy saving, so the global synchronization of the sensor network is an important supporting technology in the application of the sensor network. [0003] A variety of network clock synchronization protocols have been pro...

AI Technical Summary

Problems solved by technology

However, in a multi-hop large-scale sensor network, the synchronization error of the two protocols increases proportionally with the increase in the number of hops between the node and the root node that provides standard time services, and the synchronization process needs to be extended with the expansion of the network scale. take longer

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