Research Of Routing Protocol In Wireless Sensor Network

Wireless sensor network is a new research area of modern communication network.It can be described as an ad hoc system consisting of a collective of networked sensor nodes designed to intercommunicate via wireless radio.Wireless sensor network which is utilized in a broad foreground is able to instantly monitor,collect and process various information of envirement.Recent advances in sensor technology, micro-electromechanical systems,modern network technology and wireless communications have motivated the development of Wireless sensor network.In this dissertation,the conceptions, key technologies and the structure of wireless sensor network are presented briefly.Wireless sensor network consists of a large quantity of sensor nodes whose power, calculation ability and bandwidth are so limited that traditional wireless routing protocol is not suitable for it.Then we give the classification of the wireless sensor network and summarize the characteristic comparison of several kinds of existing protocols.Researching cluster-based routing protocol of wireless sensor network is the main part of this work. LEACH is selected to be the research target as the representative of the cluster-based routing protocols.The selection of cluster heads plays the leading role in wireless sensor network routing protocols.The former LEACH algorithms aim for adapting to clusters and rotating cluster heads. The selection of clusters depends on probability events. In every round, the cluster heads are determined randomly and the number of clusters can be different. LEACH protocol cannot promise to construct the clusters in reason. We bring forward some improvements to LEACH protocol.The improved LEACH periodically selects cluster heads according to their position and residual energy.Through simulation results, it is proved that the improved algorithms can achieve good performance in terms of system lifetime.