一种基于Ad hoc网络测距的时钟同步协议

Ad hoc网络是一种特殊的无线移动通信系统,具有无中心、多跳等特点.结合无线传感器网络时钟同步协议RBS、TPSN和有线网络DOCSIS协议,提出了一种适合Ad hoc网络的时钟同步协议.先在Ad hoc网络上建立具有层次性的全网络结构后,以发送广播时钟同步信号的方式实现全网络节点的时钟相对同步,并通过周期性和突发性的双向测距实现和维护主从时钟节点之间精确的时间同步,以满足实际应用的要求.仿真实验表明,该时钟同步协议能满足不同时钟同步精度要求下的Ad hoc网络应用,具有低功耗和高可靠性的特点.

A time synchronization protocol based on Ad hoe ranging

Ad hoe network is a special kind of wireless mobile communication system, with no center, multi-hop and so on. This paper presents a time synchronization protocol which is suitable for Ad hoe networks, according to the time synchronization protocol for wireless sensor networks (RBS, TPSN) and DOCSIS for cable networks. Firstly, the system must establish a hierarchy of the whole network structure off Ad hoe network, and then send a broadcast time synchronization signal in order to achieve all the network nodes time synchronization. Through two-way periodic or sudden ranging, the system realizes and maintains the precision time synchronization between the master-slave nodes to meet the requirements of the practical applications. Simulation results show that the time synchronization protocol can meet the different time synchronization accuracy requirements in the Ad hoe network applications with low power consumption and high reliability.