On Design of Opportunistic Spectrum Access in the Presence of Reactive Primary Users

Opportunistic spectrum access (OSA) is a key technique enabling the secondary users (SUs) in a cognitive radio (CR) network to transmit over the "spectrum holes" unoccupied by the primary users (PUs). In this paper, we focus on the OSA design in the presence of reactive PUs, where PU'...

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Bibliographic Details
Published in:IEEE transactions on communications 2013-07, Vol.61 (7), p.2678-2691
Main Authors: Che, Yue Ling, Zhang, Rui, Gong, Yi
Format: Article
Language:English
Subjects:
Access methods and protocols, osi model
Applied sciences
Channels
Cognitive radio
Complexity theory
Decisions
dynamic programming
Exact sciences and technology
Interference
Markov analysis
Markov processes
Maximization
Opportunistic spectrum access
Optimization
partially observable Markov decision process (POMDP)
Plutonium
Policies
Radiocommunication specific techniques
Radiocommunications
reactive primary user
Receivers
Sensors
Studies
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Teleprocessing networks. Isdn
Throughput
Transmission and modulation (techniques and equipments)
Transmitters
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Summary:Opportunistic spectrum access (OSA) is a key technique enabling the secondary users (SUs) in a cognitive radio (CR) network to transmit over the "spectrum holes" unoccupied by the primary users (PUs). In this paper, we focus on the OSA design in the presence of reactive PUs, where PU's access probability in a given channel is related to SU's past access decisions. We model the channel occupancy of the reactive PU as a 4-state discrete-time Markov chain. We formulate the optimal OSA design for SU throughput maximization as a constrained finite-horizon partially observable Markov decision process (POMDP) problem. We solve this problem by first considering the conventional short-term conditional collision probability (SCCP) constraint. We then adopt a long-term PU throughput (LPUT) constraint to effectively protect the reactive PU transmission. We derive the structure of the optimal OSA policy under the LPUT constraint and propose a suboptimal policy with lower complexity. Numerical results are provided to validate the proposed studies, which reveal some interesting new tradeoffs between SU throughput maximization and PU transmission protection in a practical interaction scenario.
ISSN:0090-6778
1558-0857
DOI:10.1109/TCOMM.2013.050813.120877