A Service-differentiated Based Adaptive MAC Protocol for Cognitive Radio Networks
Guangyue Lu · Telecommunication Engineering · 2013
To improve the access efficiency of secondary users(SU) and consider their QoS requirements at the same time,a service-differentiated based adaptive Media Access Control(MAC) protocol is proposed for cognitive radio networks.Specifically,real time services determine the best spectrum sensing time aiming at minimizing the spectrum access time,while users with non-real time services select proper spectrum sensing time to obtain maximum throughput.Combined with service arriving rate and scheduling policy,different services adopt slotted Aloha for medium access.Theoretical analysis and simulation results demonstrate that the proposed MAC protocol can adaptively adjust optimal spectrum sensing time for different type of services,so as to achieve higher spectrum utilization rate and ensure user′s Quality of Service(QoS) as well.