On Sensing - Access Tradeoff in Cognitive Radio Networks
In Cognitive Radio Networks (CRNs), the design of an optimal spectrum sensing scheme is an important problem that has recently been drawing consideration attention. Various sensing-related performance tradeoffs have been studied as an efficient means to maximize the secondary network performance. Despite its importance, however, the sensing - access tradeoff - between sensing overhead and the MAC-layer contention among secondary users in accessing the thus-discovered spectrum opportunities - has not yet been accounted for. In this paper, the authors show that the secondary network throughput can be improved significantly by incorporating the sensing - access tradeoff in the design of spectrum sensing.