应用于事件检测的无线传感器网络节点死活状态的研究

Study on Node Dead & Alive States in Event-detection Wireless Sensor Networks

针对应用于事件检测的无线传感器网络的特点,在大量实验的基础上,分析了单个节点因能量消耗而死亡的全过程;根据节点工作的受限程度定义了节点的亚死亡状态和死亡状态,提出一种基于Heartbeat机制的节点亚死亡状态检测方法。该方法采用邻居监测方法检测节点是否处于沉默期,并参考节点自测电压值与重启现象判断其是否进入了亚死亡状态。同时给出节点死亡的判断公式。实验表明,该方法是有效的,降低了误判,为事件检测无线传感器网络的实际应用提供了支持。

Based on experiments, the paper analyzed power-exhausting process of a node in event-detection wireless sensor networks （WSN）. It defined two states-dead state and alive state of a node, according to node work limitation. What is more, it proposed a detection method of node sub-death state based on heartbeat mechanism, which employs neighbor node monitoring method to detect if a node is on silent state. With the method,sub-death state was determined by voltage value and restart of a node. A formula of node death was presented. Experiment results show that the method is effective, and the rate or incorrect state judgment is reduced. It supports the applications of event-detection WSN.