A coordinated channel reservation MAC protocol for dynamic spectrum access networks
WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
Physical layer bootstrapping protocol for cognitive radio networks
CCNC'10 Proceedings of the 7th IEEE conference on Consumer communications and networking conference
Transmission power regulation in cooperative cognitive radio systems under uncertainties
ISWPC'10 Proceedings of the 5th IEEE international conference on Wireless pervasive computing
Blind Signal Separation for Cognitive Radio
Journal of Signal Processing Systems
Coordinated Non-Sensing MAC Protocol in Dynamic Spectrum Access Networks
Wireless Personal Communications: An International Journal
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Opportunistic spectrum access (OSA) is a promising new spectrum management approach that will allow coexistence of both licensed and opportunistic users in each spectrum band, potentially decreasing the spectrum licensing costs for both classes of users. However, this has significant implications on the QoS experienced by the licensed and opportunistic spectrum users. In this article we investigate how tolerant to secondary user activity a licensed user should be so as to provide dependable communication with sufficient QoS to an opportunistic user. We also look at key multichannel MAC features for such OSA networks proposed in the literature, and discuss how the design of control channel management affects the QoS of opportunistic users as a function of the tolerance of licensed users. We quantify the trade-off between dependability of the OSA network and the dependability of licensed users. The main conclusion is that opportunistic users can indeed achieve good QoS, as long as the licensed users are not highly active. For example, in one of the scenarios we studied, opportunistic users can achieve a delay below 100 ms if licensed user activity stays below 30 percent.