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Admission Control and Packet Scheduling in a Cognitive Radio Network with Spectrum Underlay

In this paper we study quality-of-service (QoS) provisioning in an ad hoc cognitive radio network with spectrum underlay. Both streaming traffic and non-real-time (nrt) data traffic are considered. An admission control scheme is first proposed based on relatively static information such as path loss and average interference levels in order to guarantee the average throughput of each connection. Outage performance of the streaming traffic and throughput of the nrt traffic are managed through slot-by-slot packet transmission scheduling, which opportunistically takes advantage of the randomly varying channel and interference conditions. Numerical results demonstrate that very small outage probability can be achieved for the streaming traffic, and the non-real-time connections receive throughput higher than the minimum required.