DocumentCode :
2412878
Title :
Finding Optimal Action Point for Multi-Stage Spectrum Access in Cognitive Radio Networks
Author :
Li, Bowen ; Yang, Panlong ; Xiang-Yang Li ; Wang, Jinlong ; Wu, Qihui
Author_Institution :
PLA Univ. of Sci. & Technol., Nanjing, China
fYear :
2011
fDate :
5-9 June 2011
Firstpage :
1
Lastpage :
5
Abstract :
A critical challenge in Cognitive Radio Networks (CRN) is to make decision in real-time on accessing and releasing available channels that maximize the spectrum utilization and the overall system throughput. In this work, we make investigations on optimal action point to explore and exploit the frequency-temporal diversity in addition to spectrum availability. By modeling the Rayleigh fading channel under primary user (PU) activity to be a finite state Markov channel (FSMC) with an absorbing state, we formulate this difficulty into a 2-Dimension optimal stopping problem. Further, we´ve proved that, the complexity of the 2D optimal stopping rule can be reduced to one threshold policy, where the optimal character still holds. After properly constructing multi-absorbing-states Markov chain for dynamic analysis, we get the throughput of our strategy accurately. Numerical and simulations results have verified that, our threshold based access/switch strategy gains much more throughput than conventional idle/busy based access/switch strategy at the cost of access delay in most cases.
Keywords :
Markov processes; Rayleigh channels; cognitive radio; 2D optimal stopping rule; CRN; FSMC model; PU protection; Rayleigh fading channel; cognitive radio networks; finite state Markov channel model; frequency-temporal diversity; multiabsorbing-state Markov chain; multistage spectrum access; optimal action point; primary user protection; two-dimension optimal stopping problem; Availability; Fading; Markov processes; Optimized production technology; Sensors; Switches; Throughput;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Communications (ICC), 2011 IEEE International Conference on
Conference_Location :
Kyoto
ISSN :
1550-3607
Print_ISBN :
978-1-61284-232-5
Electronic_ISBN :
1550-3607
Type :
conf
DOI :
10.1109/icc.2011.5962854
Filename :
5962854
Link To Document :
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