Abstract
To reduce the error accumulation of time synchronization in multihops for large-scale wireless sensor networks,a Dynamic Route List based Time Synchronization Protocol(DRL-TSP)is proposed.The protocol uses an available synchronization route list in each node,and allows the node to choose an optimal synchronization route to reduce the error accumulation.An identification called TTA(Time to Available)is used to deal with the synchronization failure and to ensure the reliability of the synchronization process.Experimental results indicate that the synchronization error in single hop is 5.29μs when the optional upper links are 12for each node,and the synchronization error is controlled under 11.10μs within 10hops.Moreover,the nodes of synchronization failure caused by time scale node invalidation are more low than that of Timing-sync Protocol for Sensor Network(TPSN)and close to that of Flooding Time Synchronization Protocol(FTSP).Experimental results show that the proposed protocol has a better performance than the current protocols in precision and reliability.
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