基于权重的NPCHS-Leach协议簇头选取策略优化研究

Leach协议的提出很大程度上延长了网络的生命周期，但簇头的选取并未考虑当前节点剩余能量和节点分布情况，导致网络能量消耗不平衡。改进的簇头选择协议NCHS-Leach（Novel Cluster Head Selecting Leach）存在没有考虑节点当选簇头次数以及节点距离基站的距离等问题。据此，该文提出了改进协议—基于权值的簇头选取NPCHS-Leach（Novel Power Clus?ter Head Selecting Leach）协议，在选取簇头节点时综合考虑节点的剩余能量、距离、节点成为簇头的次数以及侦听密度，优化簇头节点选取策略延长网络生命周期。通过MATLAB工具软件随机建立的网络拓扑模拟NPCHS-Leach协议、Leach协议以及NCHS-Leach协议的运行，其仿真结果表明该协议比NCHS-Leach协议延长网络生命周期40~50％。

An Optimal Clustering Selection Strategy Study on the Weighted NCHS-Leach Protocol

The Leach protocol has been proposed to much extend the life cycle of the network,but the selection of cluster heads has not considered the present residual energy of nodes and nodes distribution,which leads to unbal?anced energy consumption of the network. Its improved NCHS-Leach protocol has exist several problems,such as it does not consider the number of a node being elected cluster head node and the distance from the base station to clus?ter head node. Accordingly,this paper proposes an improved protocol,the NPCHS-Leach protocol,which comprehen?sively considers nodes’residual energy,the distance from the base station to the cluster head node,the number of a node being a cluster head and listen density to optimize the selection strategy of cluster head node to extend the net?work life cycle while selecting the cluster head nodes. Through a network topology established randomly by MATLAB simulates the operation of NPCHS-Leach protocol,Leach protocol and NCHS-Leach protocol,the simulation results show that NPCHS-Leach protocol can extend 40-50%of the network life cycle more than NCHS-Leach protocol.