DocumentCode :
2787841
Title :
Optimal Strategy for QoS Provision under Spectrum Mobility in Cognitive Radio Networks
Author :
Guo, Tao ; Moessner, Klaus
Author_Institution :
Centre for Commun. Syst. Res., Univ. of Surrey, Guildford, UK
fYear :
2012
fDate :
3-6 Sept. 2012
Firstpage :
1
Lastpage :
5
Abstract :
In cognitive radio networks, the arrival of Primary Users (PUs) may force Secondary Users (SUs) to terminate their ongoing sessions or degrade their Quality of Service (QoS) level. Given the time-varying spectrum availability, an immediate challenge arising is to support the QoS of SUs under spectrum mobility. In this paper, we propose an optimal decision-making framework for joint admission control, eviction control and bandwidth adaptation in cognitive radio networks. The problem is formulated as a Semi-Markov Decision Process (SMDP) and the optimal decision for each system state is derived to maximize the long-term network revenue as a function of the spectrum utilization, the SU blocking probability and the bandwidth adaptation cost under the SU dropping probability constraint. It is shown that the derived optimal strategy outperforms the threshold-based channel reservation schemes with/without bandwidth adaptation. And among the schemes with bandwidth adaptation, more performance improvement can be achieved by the proposed one when the bandwidth adaptation cost is taken into account.
Keywords :
Markov processes; bandwidth allocation; channel allocation; cognitive radio; decision making; mobility management (mobile radio); performance evaluation; probability; quality of service; radio spectrum management; telecommunication control; time-varying systems; QoS level; QoS provision; SMDP; SU blocking probability; SU dropping probability constraint; bandwidth adaptation cost; cognitive radio networks; eviction control; joint admission control; long-term network revenue; optimal decision-making framework; optimal strategy; performance improvement; primary users; quality of service level; secondary users; semiMarkov decision process; spectrum mobility; spectrum utilization; threshold-based channel reservation schemes; time-varying spectrum availability; Adaptation models; Admission control; Availability; Bandwidth; Bismuth; Cognitive radio;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Vehicular Technology Conference (VTC Fall), 2012 IEEE
Conference_Location :
Quebec City, QC
ISSN :
1090-3038
Print_ISBN :
978-1-4673-1880-8
Electronic_ISBN :
1090-3038
Type :
conf
DOI :
10.1109/VTCFall.2012.6399317
Filename :
6399317
Link To Document :
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