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无线传感器网络是由传感器节点和汇聚节点组成的以数据为中心的无线网络.汇聚节点根据一个或多个源节点传送的采集数据对事件进行监测和判断,而数据传输的可靠性直接影响到监测和判断的准确性.在无线传感器网络中,一方面,网络拓扑结构是动态变化的,数据传输的可靠性与网络拓扑结构有关;另一方面,网络中的传感器节点是能量受限的,因此传输的可靠性还与节点的能量密切相关.针对无线传感器网络的特点,给出了无线传感器网络的传输可靠性概念,提出一种传输可靠性度量,分别在有数据融合和无效据融合两种情况下,对网络节点的能耗情况进行了分析,获得了网络节点正常工作的概率随时间的变化关系,并导出数学表达式,用于计算节点所产生的数据包成功传输给汇聚节点的概率,从而获得了求整个网络传输可靠性的计算方法.
Wireless sensor network is a data-centric wireless network consisting of sensor nodes and sink nodes, which monitor and judge the events according to the collected data transmitted by one or more source nodes, and the reliability of data transmission directly affects the monitoring And the accuracy of judgment.In wireless sensor networks, on the one hand, the network topology is dynamically changing, and the reliability of data transmission is related to the network topology; on the other hand, the sensor nodes in the network are energy-limited, therefore The reliability of transmission is also closely related to the energy of nodes.According to the characteristics of WSNs, the concept of transmission reliability of WSNs is given, and a metric of transmission reliability is proposed, which includes two kinds of data fusion and invalid data fusion The energy consumption of the network node is analyzed and the probability of the normal working of the network node changing with time is obtained and the mathematical expression is derived for calculating the probability that the data packet generated by the node is successfully transmitted to the sink node , So as to get the calculation method to get the whole network transmission reliability.