Author(s): Gagandeep Kaur1, Kartik Sharma2

Wireless Sensor Network is a multihop network in which large number of homogeneous sensor nodes connected wirelessly for collection of data. But for this transmission, there are some constraints like energy efficiency and life of network. The life of network is depending on life of sensor node. Several solutions are proposed for energy efficiency and life of network. Nowadays clustering algorithms are designed for reduction of energy and traffic into network. We have read many routing protocols that are developed from leach and save energy up to some extent. Some of them are discussed in this paper.