NDLI: Optimal Primary-Secondary User Cooperation Policies in Cognitive Radio Networks

Content Provider	IEEE Xplore Digital Library
Author	Chatzidiamantis, N.D. Matskani, E. Georgiadis, L. Koutsopoulos, I. Tassiulas, L.
Copyright Year	2002
Abstract	In cognitive radio networks, secondary users (SUs) may cooperate with the primary user (PU) so that the success probability of PU transmissions are improved, while SUs obtain more transmission opportunities. However, SUs have limited power resources and, therefore, they have to take intelligent decisions on whether to cooperate or not and at which power level, to maximize their throughput. Cooperation policies in this framework require the solution of a constrained Markov decision problem with infinite state space. In our work, we restrict attention to the class of stationary policies that take randomized decisions of an SU activation and its transmit power in every time slot based only on spectrum sensing. Assuming infinitely backlogged SUs queues, the proposed class of policies is shown to achieve the maximum throughput for the SUs, while significantly enlarging the stability region of PU queue. The structure of the optimal policies remains the same even if the assumption of infinitely backlogged SU queues is relaxed. Furthermore, the model is extended for the case of imperfect channel sensing. Finally, a lightweight distributed protocol for the implementation of the proposed policies is presented, which is applicable to realistic scenarios.
Starting Page	3443
Ending Page	3455
Page Count	13
File Size	633294
File Format	PDF
ISSN	15361276
Volume Number	14
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Wireless communication Sensors Optimization Throughput Markov processes Queueing analysis Wireless sensor networks distributed implementation Opportunistic cooperation resource allocation imperfect sensing
Content Type	Text
Resource Type	Article
Subject	Applied Mathematics Electrical and Electronic Engineering Computer Science Applications

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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