Dynamic Spectrum Access in heterogeneous unlicensed wireless networks
International Journal of Autonomous and Adaptive Communications Systems
Spectrum sharing in wireless networks via QoS-aware secondary multicast beamforming
IEEE Transactions on Signal Processing
Distributed spectrum sensing and access in cognitive radio networks with energy constraint
IEEE Transactions on Signal Processing
Price of anarchy for cognitive MAC games
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Secondary user friendly TDMA scheduling for primary users in cognitive radio networks
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Throughput analysis of a randomized sensing scheme in cell-based ad-hoc cognitive networks
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Throughput Analysis of the Intermittent DCF for Opportunistic Spectrum Access
Wireless Personal Communications: An International Journal
Game theoretical approaches for transport-aware channel selection in cognitive radio networks
EURASIP Journal on Wireless Communications and Networking
Computers and Operations Research
Spectrum sensing and power/rate control in CDMA cognitive radio networks
International Journal of Communication Systems
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The spectrum of deployed wireless cellular communication systems is found to be underutilized, even though licensed spectrum is at a premium. To efficiently utilize the bandwidth left unused in a cellular system, the primary system (PRI), we propose an overlaid ad hoc secondary network (ASN) architecture, with the ASN operating over the resources left unutilized by the PRI. Our basic design principle is that the ASN operates in a nonintrusive manner and does not interact with the PRI. In this article we present the ad hoc secondary medium access control (AS-MAC) protocol to enable PRI-SEC interoperation, address a number of technical challenges pertinent to this networking environment, and evaluate the performance of the AS-MAC. In a single-hop ASN the AS-MAC transparently utilizes 75 percent of the bandwidth left unused by the PRI, while in multihop ASNs, due to spatial reuse, the AS-MAC can utilize up to 132 percent of the idle PRI resources in our experiments.