针对经典时间同步算法应用于无线传感器网络时主要是提高同步精度而忽略网络能耗的问题,提出了一种基于分簇的高能效无线传感器网络时间同步算法.该算法基于分簇的网络拓扑结构,基站与簇首采用改进的双向同步机制传播同步消息包,簇首与簇内节点采用双向同步机制与被动监听相结合的方式完成时间同步,减少了消息包传输的数量,同时设计了同步分组延迟的周期更新因子,进一步减少了报文开销.仿真结果证明:该机制能减少同步报文开销,降低网络能量消耗,保证良好的同步精度.%Aiming at the problem of typical time synchronous algorithms used in wireless sensor networks mainly focus on increasing network synchronization precision but ignore the network energy consumption,a cluster-based energy-efficient time synchronization algorithm for wireless sensor networks is proposed.This algorithm is based on cluster network topology structure,base station and cluster heads use improved bidirectional synchronization mechanism to spread the synchronization message packets,cluster heads and cluster nodes use bidirectional synchronization mechanism combined with passive listener to complete time synchronization which reduces number of transmission message packets and periodic update factor of synchronous packet delay is designed,and further reduce message overhead.Simulation results show that the scheme can reduce the energy consumption and synchronous packets overhead in networks as well as ensure high synchronization precision.
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