关键词: 无线传感器网络, 成簇算法, 异构, 部署知识

Abstract: Clustering algorithm is a kind of key technique used to reduce energy consumption，which can increase network scalability and lifetime.The performance of clustering algorithm in saving energy for heterogeneous wireless sensor networks is better.A new distributed energy-efficient clustering scheme named DEECUDK for heterogeneous wireless sensor networks is proposed and evaluated.Firstly，the nodes is distributed using deployment knowledge to distribute the energy uniformly in the whole monitor area；secondly，cluster-head are selected mainly by the ratio between the node’s residual energy and residual　covered energy in its monitoring radius，secondarily by the number of its neighbor node.The high initial and residual energy nodes with more neighbors has more chances to be cluster-head than others，the criterion of active nodes is introduced which do not need any cost to reduce the redundant data in a cluster，and then makes the network’s energy consumption uniformly and prolongs the survival time.Compared with existed clustering algorithm in heterogeneous wireless sensor networks，the new scheme has a better performance in survival time and throughout of network through experimental result after simulation.

Key words: wireless sensor networks, clustering algorithm, heterogeneous, deployment knowledge