Abstract: Wireless sensor networks (WSNs) consist of sensor nodes. These sensor nodes are powered by battery to communicate with each other. Energy efficiency is the vital issue in wireless sensor networks. Various Routing techniques have been evolved to maximize network lifetime, throughput and scalability. LEACH is one of the hierarchical clustering protocols widely used in WSNs. The goal of this paper is to provide brief overview of some LEACH variants.

Keywords: Wireless Sensor Network, LEACH, Hierarchical routing, cluster based routing.