无线传感器网络分层时戳比较同步法  

Hierarchical clock synchronization via comparison of time stamps for wireless senor network

作　　者：任千里[1] 徐雄[1] 戎蒙恬[1] 刘涛[1] 

机构地区：[1]上海交通大学电子信息与电气工程学院,上海200240

出　　处：《信息技术》2010年第4期7-10,15,共5页Information Technology

基　　金：上海-应用材料研究与发展基金(09700713900)

摘　　要：时间同步技术是无线传感器网络的关键技术。针对无线传感器网络的低功耗、资源有限的特性,在分析一种时戳比较同步法的基础上,提出了一种侧重于节点时钟自准的分层时戳比较同步法。具体阐述了点点同步和层与层之间的同步机制,同时提出通过估计时钟漂移参数从而降低同步次数,减少功耗和流量消耗。Clock synchronization is always key issue on wireless sensor network. In view of the stringent requirement of dissipation and resource,on the ground of a synchronization algorithm via comparison of time stamps,this paper puts forth a hierarchical synchronization algorithm via comparison of time stamps,in which self clock calibration plays an important role.It describes details of peer-to-peer and layer-to-layer synchronization,meanwhile it proposes to decrease the frequency of synchronization through an estimate of the oscillator frequency deviation so as to reduce power dissipation and traffic.

关 键 词：无线传感器网络 时间同步 功耗 时戳比较 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]