Outage Improvement in Cognitive Relay Networks by Using a Generalized Regional Model

Power control plays significant role in the cognitive network system where secondary users (SUs) co-exist with primary users (PUs), but the interference due to SUs may affect the performance of PUs. The approach of considering the outage probability of PU as quality of service (QoS) constraint, while using the maximization function of secondary user throughput is used in this paper. A generalized regional model is suggested, while using Binary Power Control (BPC) as an example case. The results conclude that under these conditions the cognitive radio relay network (CRRN), where SUs communicate through a cognitive radio base station (CRBS), with three regions (N=3) and three thresholds provides better performance, in terms of more active SUs and outage probability of SUs.