一种无线传感网络的跨层节能同步机制

减少射频空闲监听可以有效延长无线传感网络的寿命,但不恰当的同步机制会降低协议的节能效果,增加转发时延.分析了现有节能同步机制存在的问题,基于传感网络的特点提出了一种高效的跨层节能同步机制,实现了通信协议与同步机制的有机结合.通过集中发送和交错休眠,减少了节点的同步开销和休眠时延,提高了协议的节能效果;同时同步包的周期扩散为路由层提供了必要的信息,进一步降低了协议的系统开销.最后在一个树状网络上进行了验证.

A Cross-Layer Synchronization Scheme of Wireless Sensor Networks

It has been proved reducing the idle listening of radio can significantly prolong networks lifetime;however,the unreasonable listen scheme caused more energy dissipation and delay.A cross-layer synchronization scheme is proposed based on the character of wireless sensor networks,which integrate the synchronization scheme with energy-efficiency communication protocols.The sink node uniquely broadcasts synchronization information,the neighbor nodes stagger their schedule phase on a multihop path.The cost of synchronization,transmission delay,and energy consumption of node is reduced.At the same tine,the synchronization packet is periodically diffused provides the topology information for the route protocol.The proposed synchronization scheme is finally evaluated through ns-2 simulation on a tree topology.