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中文摘要：
媒体接入控制协议（MAC）是影响无线传感器网络能量效率的重要方面，S—MAC是其中具有代表性的方案。但S—MAC无法实现时间调度表的全网同步，只能形成多个在局部范围内同步的簇，簇间边界节点相对于内部节点能量消耗要快。针对这一问题提出了一种改进的MAC方案，利用定位应用中所需的节点间距离信息逐步合并各个簇，消除边界节点，提高能量效率，改善网络连通性，延长网络使用寿命。
英文摘要：
S- MAC is one of the most efficient Media Access Control （MAC） protocols which influence the energy efficiency of WSN significantly. But there is no global synchronization of the schedules in S- MAC. Nodes form clusters, in which the nodes synchronize locally. The energy of boundary nodes between dusters is depleted faster than that of the inner nodes. An improved scheme making full use of RSSI which is available for localization is presented to solve the problem. The global synchronization is achieved, the clusters incorporate and the boundary nodes disappear. The energy efficiency in MAC and the connectivity of networks are improved.
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