适用于大规模超低占空比WSN的时间同步协议

Time synchronization protocol for large-scale & ultra-low duty-cycle WSN

时间同步是无线传感器网络的重要组成部分。在超低占空比休眠机制的无线传感器网络时间同步中,迫切需要解决节点间的时钟漂移问题。目前,仅有少数解决超低占空比无线传感器网络时钟漂移问题的协议。引入同步子层思想,提出一种类根节点协同时间同步协议(TPCRC),采用首先实现同步子层的时间同步,然后实现同步子层间的时间同步,最后达到整个网络时间同步的方式,能有效解决时钟偏差(clock skew)校正后的时钟漂移问题。仿真实验表明,TPCRC能有效解决大规模超低占空比无线传感器网络时间同步中的时钟漂移问题。

Time synchronization is a vital element of wireless sensor network.So the CD(clock drift)of time synchronization need to be solved urgently in the ultra-low duty-cycle WSN.So far,there were just only a few corresponding protocols solving CD problem of large-scale&ultra-low duty-cycle WSN.By introducing synchronization sublayer,this paper proposed a new time synchronization protocol(TPCRC)which realized the time synchronization of synchronization sublayer firstly.Then the synchronization sublayers,ultimately,finished the synchronize of WSN.In this way,the CD problem of the ultra-low duty-cycle sleeping mechanism could be solved effectively after the CS(clock skew)correction.The simulation shows that TPCRC owns high performance at the time synchronization of large-scale&ultra-low duty-cycle WSN with CD.