Performance bounds of prioritized access in coexisting cognitive radio networks

In this paper, we consider two uncoordinated and geographically overlapping Cognitive Radio (CR) networks coexisting together with Primary User (PU) networks. One of the CR networks, the Cognitive Gateway Network (CGN) has higher priority to access the spectrum than the other CR network. We study the achievable rates of both CR networks. The achievable data rate per-node is derived analytically considering various scenarios of spectrum sensing results. The performance bound of spectrum sensing in terms of false alarm probability under prioritized access is also derived. The results of this paper illustrate how the different CR network parameters, such as transmission probability and sensing performance, affect the achievable rate in prioritized overlapping CR networks. Thus it may serve as a guide for practical deployments.