NeXt generation/dynamic spectrum access/cognitive radio wireless networks: a survey
Computer Networks: The International Journal of Computer and Telecommunications Networking
Accurate available bandwidth estimation in IEEE 802.11-based ad hoc networks
Computer Communications
Cooperative cognitive radio with priority queueing analysis
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Delay analysis for cognitive radio networks with random access: a fluid queue view
INFOCOM'10 Proceedings of the 29th conference on Information communications
Optimal spectrum sensing framework for cognitive radio networks
IEEE Transactions on Wireless Communications
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Given the highly variable physical layer characteristics in cognitive radio sensor networks (CRSN), it is indispensable to provide the performance analysis for cognitive radio users for smooth operations of the higher layer protocols. Taking into account the dynamic spectrum access, this paper formulates the two fundamental performance metrics in CRSN; bandwidth and delay. The performance is analyzed for a CSMA-based medium access control protocol that uses a common control channel for secondary users (SUs) to negotiate the wideband data traffic channel. The two performance metrics are derived based on the fact that SUs can exploit the cognitive radio to simultaneously access distinct traffic channels in the common interference region. This feature has not been exploited in previous studies in estimating the achievable throughput and delay in cognitive radio networks. Performance analysis reveals that dedicating a common control channel for SUs enhances their aggregated bandwidth approximately five times through the possibility of concurrent transmissions on different traffic channels and reduces the packet delay significantly.