Synchronization method for layered time comparative clock in wireless sensor network

Abstract

Disclosed is a layered time comparative clock synchronized method in the wireless sensor network, which belongs to the wireless network technology field. The method comprises the following steps: step one, the network initialization is started, and the network is layered from a basic station / a coordinator according to the signal intensity and the device category; step two, the whole network is divided into outer clock source synchronization and inner clock source synchronization, the nodes are synchronized by adopting the timestamp comparative method, and the upper-level nodes and the lower-level nodes respectively take the outer clock source synchronization and the inner clock source synchronization; step three, the synchronizing cycle and the clock drift parameter are regulated according to previous synchronization effects; step four, the old timestamp is automatically discarded. Compared with prior art, the method can better correspond with the accuracy of the wireless sensor network time synchronization method, and has the advantages of low cost and solidity.

Description

technical field [0001] The invention relates to a method in the technical field of wireless networks, in particular to a method for layered time comparison and clock synchronization in a wireless sensor network. Background technique [0002] In recent years, wireless sensor networks (WSNs) composed of low-power wireless sensors have been widely used. Time synchronization is an important part of WSNs applications. Control message conflicts, data fusion, and node positioning all require clock synchronization between nodes. [0003] Many universities and research institutions at home and abroad have conducted in-depth research on the synchronization technology of wireless sensor networks and proposed a variety of time synchronization methods to meet the application needs of sensor networks from different aspects. So far, more than a dozen implementation methods have been proposed, typically RBS, TPSN, LTS, TS / MS, TSync, DMTS, FTSP, AD, TSS and TDP. Although these methods meet...

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Problems solved by technology

This method has less computational overhead and communication overhead, avoids the estimation of packet processing delay with the greatest randomness, and avoids the possibility that some algorithms may dial back the clock, but this method is only suitable for stable single-hop The network effect is better, and the synchronization accuracy is poor in a large-scale dynamic network, which is obviously not enough for some practical applications

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