Abstract: Low energy consumption is one of the important technical requirements of time synchronization algorithm of wireless sensor network. In order to reduce energy consumption, a greatly low energy consumption time synchronization algorithm for wireless sensor network is proposed, named LECTS. This algorithm, which is based on the base mechanism of TPSN, improves in two phases at the same time to reduce energy consumption. In the level discovery phase, it uses the distance between nodes limits part of nodes broadcast to reduce the packets send. Meanwhile, in the synchronization phase, combining unidirectional reference broadcast and pair-wise mechanism, only one node in broadcast domain needs time synchronization, and also greatly reduces the messages. The simulation results show that the algorithm greatly reduces lots of broadcasting packets and exchanges messages for time synchronization of wireless sensor networks, and node density is greater, the energy conservation is more remarkable.

Key words: wireless sensor networks, time synchronization, low energy consumption, limited part of the broadcast, pair-wire time synchronization, reference broadcast synchronization

摘要： 低耗能是无线传感器网络时间同步算法的重要技术要求之一。为了降低同步过程中的能量消耗，提出了一种低能耗LECTS（Low Energy Consumption Time Synchronization）算法。该算法基于TPSN算法的基本思想，在两个阶段同时进行改进来降低能量消耗。在层次发现阶段利用节点之间的距离来限制部分节点广播，降低数据包的发送；在同步阶段结合单向广播和双向报文交换同步机制，也同样降低数据包的发送。通过仿真结果表明，与TPSN算法以及其改进算法STSP算法相比，算法能显著地降低无线传感器网络时间同步的能量消耗，且节点密度越大，节能越显著。

关键词: 无线传感器网络, 时间同步, 低能耗, 限制部分广播, 成对同步, 参照广播同步