Paper Title
Comparative Analysis of Sep Variants

Abstract
Energy management is one of the critical parameters in large scale WSN. If an individual node in the network communicates and forwards its data directly to BS, there is a maximum probability of network congestion and data collisions. As the sensor nodes have limited battery power, it will result in energy depletion faster and will degrade the overall network life time. To optimize the network life and management strategies certain goals like, prolonged network life time, scalability, coverage and network simplicity are desirable. To achieve these goals, it is essential to purpose an efficient and scalable network layer protocol. To address above mentioned issues clustering protocol have been proposed by various researcher. Clustering protocols provide the solution to utilize the network energy uniformly to enhance the network life time, maximize the packet delivery ratio and throughput as well clustering of nodes avoids long distance communication of nodes to BS. Many novel techniques have been proposed by the researchers related to heterogeneous sensor networks and have made their best efforts to overcome the challenges and obstacles but somewhere these theoretical proposed protocols lack deficiencies. In this paper we have investigated different variant of SEP which were proposed by various researchers in terms of stable and unstable region and number of cluster head per round. Keywords - HWSN, Energy, Clustering, Heterogeneous, Cluster Head, Residual Energy