Call-level performance evaluation and QoS provisioning in cognitive radio networks

This paper investigates the call-level performance of a cognitive radio network for dynamic spectrum access providing multimedia service to secondary users. The serving system is modeled by a two-dimensional state-transition diagram and a novel approximate but computationally efficient analytical approach for solving its state probabilities is developed. A new precise formula for evaluation of the call dropping probability of the secondary users is derived. Channel limitation as a method for quality of service provisioning is suggested. Extensive simulation experiments are performed to validate the proposed analytical solutions. Numerical results are presented and some insightful conclusions are drawn.