A distributed sensing and medium access algorithm to prolong the lifetime of WSN

Wireless sensor networks (WSNs) as a wide application vise technology are in the center of researcher attention. Because of their characteristics, energy consumption is the main factor for WSN deployment. In this paper we try to propose a distributed scheduling algorithm to extend the network lifetime. Since sensor nodes might generate significant redundant data, in the proposed scheduling algorithm, just predetermined node collaborates in sensing and transmitting phase to prevent similar packets from multiple neighbor nodes. So the number of similar packets which transmitted to the sink is decreased. In addition the scheduling algorithm lead to low collisions and also the retransmission packets is reduced. Since the proposed method is completely distributed the nodes do not suffer from any transmission overhead. The simulation results compare the total delay, collision rate and consumed energy. As depicted in the results the proposed method make the network more energy efficient and also improve the collision rate and end-to-end delay.