NeXt generation/dynamic spectrum access/cognitive radio wireless networks: a survey
Computer Networks: The International Journal of Computer and Telecommunications Networking
Performance Analysis of Cognitive Radio Networks against Secondary User's Policies
ICIS '09 Proceedings of the 2009 Eigth IEEE/ACIS International Conference on Computer and Information Science
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
What and how much to gain by spectrum agility?
IEEE Journal on Selected Areas in Communications
Dynamic spectrum allocation based on cognitive radio for QoS support
Proceedings of the 13th ACM international conference on Modeling, analysis, and simulation of wireless and mobile systems
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In a cognitive radio network (CRN), instead of direct leaving, an interrupted secondary user is suspended to wait for accessing another channel in a call level queue. The policy for handling the packets generated by the secondary user during the suspending period can be either delaying or discarding. According to these two packet level policies, the queue is separated into two parts, delay queue and discard queue. The paper mainly analyzes the performance of a CRN with such a two-part call level queue. Here, a Markov model is proposed to derive the formulas for packet loss ratio, packet delay, spectrum utilization and throughput. Numerical results show that theoretical models are consistent with simulation results. The major observations are summarized below. (i) Both packet loss ratio and throughput increase while the packet delay decreases with the increase of the delay queue length. (ii) Adopting different delay queue length does not cause much difference in CRN's spectrum utilization, but has a large effect on throughput. (iii) The performance is bounded when the arrival rate goes into infinitely high.