Performance Analysis of a Delay-Tolerable Cognitive Radio Network

Abstract

Abstract-In this paper, we analyze the performance of a delay-tolerable cognitive radio network at the call level, where secondary users detect and opportunistically access the channel resources when no primary users present. An ongoing secondary user using a channel may switch to another channel with some routing probability (due to the presence of a primary call) or leaves the channel (due to service completion) with some other probability. If the target channel is being used at that time, the secondary call will be placed in the queue of the channel. The queued secondary calls will reconnect back to the system when the channel becomes available. We develop a queueing network model for the system and solve the equilibrium system states by the generating function technique. Numerical results are presented to show the impact of system parameters on the performance metrics.