Receiver Initiated Multi-channel Medium Access Control protocol for Cognitive Radio Network

At present Cognitive Radio Network (CRN) is one of the contemporary research area in order to improve efficiency as well as improve spectrum utilization factor of wireless communication. The impression of profitable CRN (i.e., simultaneous presence of primary and secondary users in licensed bands) is increasing popularity in wireless communication research. In fact fixed unlicensed band is used by wireless users in different networks to complete data communication. However, in practical number of wireless users are increasing day by day and guides this limited bandwidth to a saturation state. In CRN as at the absence of primary user, the secondary users access the channels of licensed bands; thereby the Medium Access Control (MAC) protocol for CRN faces many challenges. The challenges include throughput maximization, channel rendezvous amongst the secondary users, minimize delay, and to keep continuing data transmission without interfering the primary users. A large number of sender initiated MAC protocols have been proposed for CRN to solve these challenging issues. However we argue that efficient channel rendezvous in many scenarios still a major concern in accordance with the rest of the mentioned challenges. In this paper, we have come up with a Receiver Initiated Multi-channel (RIM) Medium Access Control (MAC) protocol named as RIM-MAC exploiting the pseudorandom number channel sequence and hopping method for multi-channel rendezvous amongst the secondary users of CRN. This protocol is efficient scheme for channel rendezvous success rate. We have analyzed and implemented our proposed RIM-MAC protocol, and found that it provides better performance in terms of throughput, rendezvous rate and delay.