A Theoretical Scheme to Implement MAC Protocols in VANETs Employing Cognitive Radio

Vehicular communications have the capacity to open up a plethora of service applications and most importantly, increasing road safety by providing warning messages. To enable these features, it is necessary to establish MAC protocols which not only offer good QoS and fairness but also address other concerns of Vehicular Ad-hoc Networks (VANETs). As VANETs pose greater challenges compared to conventional Ad-hoc networks like MANETs, it is required to implement effective medium access schemes which address efficient use of spectrum, minimization of packet delay, as well as authentication, security and prioritized delivery of safety messages. In this paper, we study novel concepts of three recently proposed MAC protocols for VANETs. We provide a theoretical approach in implementing multiple MAC protocols for VANETs, which use cognitive radio technology, by combining some of the novel features proposed in the reviewed protocols.