对无线传感器网络区域数据聚合有效性的研究

Efficiency of area-based data aggregation in wireless sensor networks

通过抽象出无线传感器网络中区域数据回传的网络模型,定量研究了区域数据聚合的节能条件,证明了先聚合再回传比直接进行数据回传所节省的相对路径长度,如果大于等于数据相关性与源节点个数的比值时,区域数据聚合一定可以节省能耗,并进一步给出了当数据聚合点在网络的不同位置,或数据的空间相关性不同时,区域数据聚合的节能条件。对于无线传感器网络的部署、路由协议的选择及评估数据聚合算法的能量有效性等,均具有一定的参考价值。

By setting up a network modal of data aggregation and using a bit-hop metric to quantify energy costs in wireless sensor networks, we formally analyze the problem of area-based data aggregation and obtain that data aggregation will defirdtely be energy efficient when the relative difference between the average lengths of the two shortest paths, which are from source sensor nodes to the sink and to the aggregation node respectively, is not less than the ratio of data correlation to the number of sottree sensor nodes. Simulation results show that over 50% energy cost can be saved under the given conditions.