NeXt generation/dynamic spectrum access/cognitive radio wireless networks: a survey
Computer Networks: The International Journal of Computer and Telecommunications Networking
Cognitive radio: brain-empowered wireless communications
IEEE Journal on Selected Areas in Communications
Dynamic spectrum access in open spectrum wireless networks
IEEE Journal on Selected Areas in Communications
Performance Evaluation of Secondary Users Operating on a Heterogeneous Spectrum Environment
Wireless Personal Communications: An International Journal
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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.