Spectrum Sharing with Buffering in Cognitive Radio Networks

Abstract

Cognitive radio network is proposed as the solution to fully utilize the valuable spectrum. In the absence of primary users (PUs), secondary users (SUs) have the same right to use spectrum. With spectrum sharing technique, cognitive radio network access should be coordinated to prevent multiple secondary users colliding. In this paper, we propose a new spectrum sharing scheme with buffering for new SU and interrupted SU. Markov model is developed, and analyzed to derive the performances of the proposed spectrum sharing scheme in both primary system and secondary system. Particularly, the blocking probability, the forced termination probability, the non-completion probability and waiting time are calculated for SUs. Simulation results show that the proposed approach can reduce the blocking probability extremely with very little increased forced termination probability.