INPMAC: An Improved Node Power based MAC protocol with Adaptive Listening period

Abstract

Wireless Sensor Networks comprises of a number of elementary devices called motes that are also equipped with some capabilities of sensing, computing and communications that works simultaneously to sense data and send the information at the sink. WSNs are always expected to be operational for a long period of time because the battery is non-replaceable and also non-rechargeable. For this MAC protocols are used as these are energy efficient protocols. These protocols reduces the Energy consumption, idle listening, delay, collisions. In that order the concept of Duty Cycle is taken into consideration. Lesser the Duty cycle, lesser the energy consumption and hence improved lifetime. In this paper, INPMAC protocol is proposed that uses the concept of multi-layering. When the active duration of frame duration is divided into a number of layers and thereby further the active and sleep modes are defined that do not overlap among layers, this technique of reducing the duty cycle is called multi-layering. In this paper, we have used Modified Logarithmic Backoff Algorithm. In simulation results, it is found that the energy consumption per node in case of proposed INPMAC reduces to 25.95% than NPMAC with improvement in Sleeptime, Average Packet Delay, Probability of Collision than NPMAC as 5.8%, 8.4% and 12.2%.