关键词: 无线传感器网络, 时间同步, 双向同步, 低能耗, 周期更新系数

Abstract: Concerning the problem that typical time synchronous algorithms used in multi-hop Wireless Sensor Network (WSN) mainly focus on increasing the network synchronization precision, but ignore such issues as the network energy, path hop and error accumulation, a cluster-based and energy-efficient hierarchical time synchronization algorithm was proposed based on a cluster hierarchical network structure. In this algorithm, a cluster node was selected to take a two-way synchronization with the cluster head, and its neighbor nodes achieved bidirectional synchronization indirectly through the passive monitoring mode. In such a way, the number of the packet's transmission was reduced while the digital signature pattern ensured the safety of transmission. In addition, the cycle update coefficient of synchronous group delay was quoted to further reduce the consumption of synchronization packets. The simulation results show that the algorithm reduces the energy consumption and prolongs the network life time, therefore this algorithm has certain practicability.

Key words: Wireless Sensor Network (WSN), time synchronization, bidirectional synchronization, low energy consumption, cycle update coefficient