International Journal of Engineering and Technology

Wireless sensor network is a kind of ad-hoc network where enormous number of nodes are distributed to monitor physical and habitat conditions.These are generally of autonomous type. WSN has been a difficult job to implement widely for some applications because of its energy consumption, challenges in environmental conditions etc. To extend the lifetime of WSN the LEACH protocol is implemented by forming clusters for routing in a large scale network. LEACH protocol utilises the technique of selecting the cluster head through random rotations of a local cluster to distribute evenly the energy load among the wireless sensor network. In cluster communication distributed nodes transmit data packets to its cluster head through intermediate nodes. Below a threshold energy level these nodes loses its energy and packets get dropped. In the proposed system an amendment in LEACH protocol in order to extend the lifetime of entire network and to avoid the data loss an alternative node is made to replace the original. This increases the number of data packets delivered to the base station.