CM-MAC: A cognitive MAC protocol with mobility support in cognitive radio ad hoc networks

Cognitive radio ad hoc networks (CRAHNs) have recently been proposed as a way to bring cognitive radio technology to traditional ad hoc networks. An important problem is to design a medium access control (MAC) protocol that addresses the decentralized control and local observation for spectrum management. In this paper, we propose a cognitive MAC protocol with mobility support (CM-MAC) based on Carrier Sense Multiple Access/Collision Avoidance (CSMA/CA) technique, where CM-MAC protocol can respond to the CRs vicinity state to primary exclusive regions. Furthermore, this paper analyzes the throughput performance for the proposed MAC protocol with the consideration of multiple primary user activities and CR node mobility. Our analytical results show that the proposed MAC protocol has desired upper bound of spectrum utilization as well as outperforms the throughput performance of CSMA/CA MAC and statistical channel allocation (SAC) MAC protocols given a certain condition.