Rani,“Improvement in energy efficiency of Wireless Sensor Network

Now days the use of Wireless Sensor Network (WSN) has arisen extremely. The main requirement of wireless sensor network is to extend the network lifetime and energy efficient routing, data gathering and aggregation protocols that representing large-scale environment. Hierarchical clustering protocols have been used for energy efficient routing in wireless sensor networks. In WSN, the sensor nodes have a limited processing, and storage capabilities and transmission range, as well as energy resources also limited. Routing protocols maintain the routes in the network and ensure reliable multi-hop communication under limited resources. WSNs use clustering for achieving scalable and efficient communications. Clusters are organized and select a cluster head for each cluster. Cluster head nodes have great importance in these network topologies because these nodes are communication and coordination hubs. In this paper a detailed description about HEED is provided, as well as comparison with other hierarchical routing protocols as LEACH and PEGASIS. KEYWORDS: Wireless sensor network, routing protocol, clustering