中文摘要：

如何降低无线传感器网络（WSNs）节点的能耗来延长网络寿命是非常重要的,无线网路的性能主要取决于MAC协议,若要降低节点能耗,合理的设计与改进MAC协议就成为一个关键性问题。主要介绍了无线传感器网络中的ZigBee技术发展与应用,针对相关能耗问题,将延迟测量时间同步（DMTS）算法融入到ZigBee网络中,同时引入了基于S-MAC协议机制的周期性侦听/睡眠、碰撞避免等措施对协议进行改进,通过仿真与基本协议进行比较。仿真结果表明：改进的协议能够有效降低网络节点能耗。

英文摘要：

How to reduce the energy consumption of nodes in wireless sensor networks（ WSNs）,extend the life cycle of the network is very important. The performance of WSNs mainly depend on MAC protocol. To reduce energy consumption of nodes,reasonable design and improvement of MAC protocol has become a critical issue.Development and application of ZigBee technology in WSNs mainly introduced. To solve these related issues,delay measurement time synchronization（ DMTS） algorithm is fused into ZigBee networks while mechanism cyclical interception/sleep,collision avoid other measures based on S-MAC protocol is introduced. To improve the protocol,compare with basic protocol by simulation. The simulation results show that energy consumption of node is reduced efficiently by the improved protocol.