Abstract: “In this survey paper, various challenges to wireless sensor networks are considered and Clustering as a solution to one of them has been introduced. The wireless sensor network is divided into clusters in order to reduce energy consumption as well as to increase coverage area to larger extent. The various clustering schemes with different parameters and in different environments such as static and mobile are discussed. The fuzzy approach in cluster head selection has overcome uncertainty of wireless sensor network at different levels”

Keywords: wireless sensor network, clustering, cluster head, sensor node, hop, fuzzy approach