A Design Of Time Synchronization Protocol Based On Dynamic Route And Forwarding Certification

Time synchronization is a key technique in large scale wireless sensor networks applications. In terms of the problems that synchronization error accumulation in multi-hop, clock frequency abrupt swinging and network topology changing, a design of time synchronization protocol based on dynamic route and forwarding certification (DRFC-TSP) is proposed in this paper.In the time synchronization process, by every single hop selecting a node with fewer synchronization hops and more stable clock frequency as the reference node to get the best synchronization route, synchronization error accumulation can be inhabited and the impact of clock frequency abrupt swinging to time synchronization precision will be reduced. Also, changes of network topology can be well adapted by dynamical routing that the reference node is updated in every synchronization round. In the forwarding certification process, the qualification of nodes to forward synchronous information outwards will be certificated by information exchanging between neighbor nodes. Only synchronous information of the certificated nodes with better performance can be forwarded. The network traffic can be decreased and the time synchronization precision also can be ensured even with less energy consumption. Feasibility testing in large scale wireless sensor networks is verified on NS2 simulation platform and more performances are validated through single node testing with transplanted DRFC-TSP protocol on experimental platform built with embedded Linux development boards.