Call Blocking Probability and Packet Delay in Cognitive Radio Networks

In a cognitive radio network (CRN), an preempted secondary user (SU) is placed in a call level queue to wait for accessing another channel. If the availability of channels is transparent to SUs, packets will be generated during their waiting time and the performance of the CRN will be influenced by which way to handle these packets. In this paper, an analytical model for both call-level and packet-level performance evaluation for SUs in cognitive radio networks is developed. The call level performance measure (i.e. call blocking probability) and the packet level performance measure (i.e. packet delay) can be obtained from the analytical model. Numerical results show that analytical model is consistent with simulation results.