Abstract: “Wireless sensor network (WSNs) are networks of distributed autonomous device that can sense or monitor physical or environmental condition cooperatively. The WNS application can be classified in different categories: monitoring, alerting, healthcare assistance, and actuating, among others. In this environment where in a round of communication each of the sensor nodes has data to send to a base station, it is important to minimize the total energy consumed by the system in a round so that the system lifetime is maximized. With the use of data fusion and aggregation techniques, while minimizing the total energy per round, if power consumption per node can be balanced as well, a near optimal data gathering and routing scheme can be achieved in terms of network lifetime. So far, besides the conventional protocol of direct transmission, two elegant protocols called LEACH and PEGASIS have been proposed to maximize the lifetime of a sensor network. In this paper, we propose two new algorithms”

Keywords: Energy Efficiency, Data fusion and Aggregation, PEGASIS, LEACH, PEDAP.