Research on Synchronization Scheme of Low-duty-cycle MAC Protocols of Sensor Networks
Xianxin Zhong · Jisuanji fangzhen · 2007
It has been proved low-duty-cycle MAC protocols can significantly prolong networks lifetime. However tests showed that many nodes followed two or more schedules in a large multi-hop network,which caused more energy dissipation. At the same time,sleep incurred a latency penalty in a multi-hop network because packets must wait for the next listen period for transmission. A synchronization scheme of sleep schedule was proposed; the sink node is only synchronizer and periodically sends synchronization information,other nodes just follow a schedule and broadcast their schedule,and the neighbor nodes stagger their schedule phase on a multihop path. The proposed synchronization scheme was evaluated through ns-2 simulation on a tree topology. The results show that the scheme accomplishes the goals of reducing energy consumption and latency in sensor networks.