Wireless sensor network is composed of large number of sensor nodes (SNs) and one or more sink nodes also called as base stations (BS) to which data is to be transmitted. These sensor nodes are associated with limited battery power and wireless communication which are deployed to collect useful information from the field. Gathering this sensed information in cost effective manner at base station is task of research.Earliest proposed techniques were directly transmitting data to base station which was further improved by collecting and aggregating the data in sensor network which increased...