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无线传感器网络中无标度拓扑的动态容错性分析
Dynamic fault-tolerance analysis of scale-free top ology in wireless sensor networks
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摘要: 增强网络的动态容错性对于抵御级联失效具有重要的现实意义。根据无线传感器网络无标度拓扑中节点可变负载和恒定容量的特点建立级联失效模型，在随机节点失效下研究负载参数和拓扑参数对其级联失效容错性的影响规律，解析推导出该网络大规模级联失效的承载极限，同时模拟结果发现该网络的级联失效容错性与其度分布系数和幂指数正相关。这为从参数优化角度抵御随机节点失效下无线传感器网络无标度拓扑级联失效危害提供了依据。Abstract: It is very important in practice to avoid cascading failures by increasing the dynamic fault-tolerance of the network. Firstly, a cascading failure model is proposed in this paper, based on the characteristics of the variable load and the fixed capacity of the nodes in wireless sensor network scale-free topology. Then the influences of the load parameter and topology parameters on the fault tolerance are investigated in the case of cascading failure caused by random failure nodes. Finally the critical value of load for the large-scale cascading failure of network is deduced. Simulation result shows that the network’s cascading failure fault-tolerance is positively related with the degree parameters, coeffcient and power-law exponent. Researches provide regulation to avoid the cascading failure caused by the random failure nodes effectively from optimizing the parameters viewpoint.
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