摘要
时间同步作为无线传感器网络的关键技术之一,对整个网络的工作和发展有着至关重要的作用。提出了基于层次结构的传感器网络时钟同步协议(TPSN)改进算法:在层次建立阶段采取等级广播,在同步阶段采取直接双向和间接双向相结合的时间同步方式,获得相对较少的报文开销和系统维护开销;进行了时间频率偏移校正,以保证节点的时间同步精度。仿真实验结果表明,该算法不仅提高了网络的同步精度,也节约了网络的能量消耗,更加满足实际应用的需求。
Time synchronization is one of the key technologies for wireless sensor networks,and it plays an irreplaceable role for the work and development of the entire wireless sensor network.This paper proposed an improved Timing-sync Protocol for Sensor Networks（TPSN） algorithm based on hierarchy.This algorithm took level-broadcast in phase of level establishment,and a combined active and inactive two-way synchronization algorithm was used in phase of time synchronization,obtaining a relatively small cost of packet and system maintenance.This improved algorithm carried out time-frequency offset correction,and ensured the accuracy of the node.The improved TPSN algorithm not only enhances the accuracy of synchronization,but also saves the energy consumption for the network.
出处
《计算机应用》
CSCD
北大核心
2012年第6期1513-1515,1551,共4页
journal of Computer Applications
基金
辽宁省教育厅科学科研基金资助项目(L2010168)
关键词
无线传感器网络
时间同步
传感器网络时钟同步协议
频率偏移
等级广播
双向同步
Wireless Sensor Network（WSN）
time synchronization
Timing-sync Protocol for Sensor Networks（TPSN）
frequency offset
level-broadcast
two-way synchronization
