Life time maximization of wireless sensor network using modified As-Mac protocol

Wireless sensor network (WSN) is a group of wireless nodes where each node consists of transceivers, microcontrollers, electronic sensors and power supply. Usually, the power supply source is battery which is impossible to recharge and reuse. So Energy efficiency is the main task in most wireless sensor network applications for maximizing the life time. MAC protocol is designed to conquer the energy consumption in wireless sensor networking, as most of the power consumption in the sensor node is due to the communication subsystem….. Here, existing AS-MAC protocol is modified to wakeup nodes periodically to receive packets in order to increase the energy efficiency. It is used to coordinate asynchronously the wake up times of neighboring nodes to drain overhearing, contention and delay. Besides, it exploits Low Power Listening (LPL) to minimize the periodic wake up time. Thus it improves the life time.