基于综合故障的无线传感器网络无标度容错拓扑模型研究

A scale-free fault tolerant topology model in wireless sensor network for toleration of comprehensive fault

针对无线传感器网络实际应用中遇到的环境损毁和能量耗尽的问题,本文首先对网络综合故障进行建模,获取满足综合故障容忍能力和网络生命期双重需求的网络节点度和节点度上限值的取值规律,并结合由无标度特征导出的两者关系,从而求得最优节点度上限值,最终引入关于节点度上限值的适应度函数,提出了容忍环境损毁和能量耗尽综合故障的无标度容错拓扑演化模型.仿真实验结果表明,该模型演化生成的无标度拓扑对环境损毁和能量耗尽具有较好的容错性,并能够有效地延长网络生命期.

A wireless sensor network in practice often suffers from environment damage and energy depletion. In order to solve the problem, this paper establishes a comprehensive fault model first. Then according to the demand for comprehensive fault tolerance ability and network lifetime, a relationship between the network node degree and the maximum node degree is obtained. And the relational expression between the two kinds of node degrees derived from the scale-free characteristics is acquired. Thus the optimal maximum node degree can be solved. Finally, based on the fitness function for the maximum node degree introduced, a scale-free fault tolerant topology evolution model is put forwarded which can effectively tolerate comprehensive fault. Simulation results show that the scale-free topology obtained has strong fault tolerance for environment damage and energy depletion. And it also can effectively prolong the network lifetime.