Spectrum Access Management of Multi-class Secondary Users in Hybrid Cognitive Radio Networks

Abstract

In this paper, a general spectrum access scheme is introduced for multi-class secondary users operating in a hybrid interweave/underlay cognitive radio network. The hybrid channel access mode combines the benefits of interweave transmission (opportunistic access with high throughput) and that of the underlay transmission (anytime transmission with controlled power). Additionally, classifying the SUs helps to meet their different quality of service (QoS) requirements. The proposed scheme tackles three challenges: resolving the contention of the SUs to access the channel, scheduling an arbitrary number of SU classes, and providing a tunable spectrum resources allocation scheme. Specifically, each class of SUs is assigned a number of time slots for exclusive hybrid channel access according to their QoS requirements. The numerical results show the superiority and flexibility of the proposed scheme compared to other related work in literature.