A Service Differentiation Based Adaptive p-persistent MAC Scheme

This paper proposes an adaptive p-persistent MAC scheme, named DSA-MAC (differentiation service based adaptive MAC scheme), for WSN to provide the QoS guaranteed differentiation services. The proposed scheme introduces a new parameter, persistent factor, and combines with the dynamic adjustment of parameters, whose optimal value can dynamically follow the change of the load based on the network status. At the same time, the transmission probability of each priority class can be updated by optimal persistent factor to achieve the channel utilization close to its optimal value. Simulation results show that DSA-MAC can achieve much higher throughput and have shorter delay than standard CSMA/CA based DCF in all different WSN environments, and is simple and easy to implement