Opportunistic Spectrum Access in Cognitive Radio Networks: A Queueing Analytic Model and Admission Controller Design

TitleOpportunistic Spectrum Access in Cognitive Radio Networks: A Queueing Analytic Model and Admission Controller Design
Publication TypeConference Paper
Year of Publication2007
AuthorsRashid, M. M., J. Hossain, E. Hossain, and V. K. Bhargava
Conference NameGlobal Telecommunications Conference, 2007. GLOBECOM '07. IEEE
Pagination4647 -4652
Date Publishednov.
Keywordsadmission controller design, channel allocation, channel quality variation, cognitive radio, cognitive radio networks, control system synthesis, finite state Markov chain, Markov processes, opportunistic channel allocation scheme, opportunistic spectrum access, QoS, queueing analytic model, queueing theory, secondary users, spectrum utilization, statistical analysis, statistical delay, telecommunication congestion control, wireless channels

Cognitive radio (CR) technology is an innovative radio design philosophy in order to increase the spectrum utilization by exploiting the unused spectrum in dynamically changing environments. Specifically, the CR technology will allow a group of potential users (referred to as secondary users) to access available spectrum resources unused by primary users (PUs) for whom the band has been licensed. The spectrum available for secondary users (SUs) depends on PUs' activity in the licensed spectrum. In this paper, we develop a queuing analytic framework to study important performance measures experienced by SUs in a CR network. We study queuing delay and buffer statistics of SUs' packets by modeling PUs' activity as a two state Markov chain and SUs' channel quality variation as a finite state Markov chain (FSMC). In order to allocate available channels among the SUs, an opportunistic channel allocation scheme is considered. The proposed framework facilitates to design an admission controller for SUs' network in order to maintain a given quality service (QoS) requirement which is specified in the form of statistical delay guarantee.


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