Abstract
This chapter studies and develops cognitive MAC protocols in OSA networks for secondary users (SUs) to access temporarily idle frequency-slots of a licensed frequency band, taking into account the time-varying and dynamic behavior of primary users (PUs). Aiming to reduce the effects of collision between PUs and SUs due to the PU random return, a transmission strategy is proposed for SUs to dynamically hop over multiple idle frequency slots, each with an adaptive activity factor to be determined. Taking into account the spectrum sharing among SUs, the dynamic PU activity and channel characteristics, the SU activity factor optimization problem is formulated for maximizing the overall SU throughput. Based on the dual decomposition method, the optimal MAC algorithm is presented. Subsequently, a fully distributed learning-based OSA algorithm is developed in which each SU independently adapts its activity factors to the optimal values over time by learning other SUs' behavior from locally available information. The convergence and convergence rate that characterize its asymptotic behavior and efficiency are analyzed.
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Derakhshani, M., Le-Ngoc, T. (2014). Cognitive MAC Designs: Hopping Transmission Strategy. In: Cognitive MAC Designs for OSA Networks. SpringerBriefs in Electrical and Computer Engineering. Springer, Cham. https://doi.org/10.1007/978-3-319-12649-4_3
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DOI: https://doi.org/10.1007/978-3-319-12649-4_3
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