title   
  

Optimal scheduling and power allocation in cooperate-to-join cognitive radio networks

Karaca, Mehmet and Khalil, Karim and Ekici, Eylem and Erçetin, Özgür (2013) Optimal scheduling and power allocation in cooperate-to-join cognitive radio networks. IEEE/ACM Transactions on Networking, 21 (6). pp. 1708-1721. ISSN 1063-6692 (Print) 1558-2566 (Online)

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Official URL: http://dx.doi.org/10.1109/TNET.2012.2230187

Abstract

In this paper, optimal resource allocation policies are characterized for wireless cognitive networks under the spectrum leasing model. We propose cooperative schemes in which secondary users share the time slot with primary users in return for cooperation. Cooperation is feasible only if the primary system’s performance is improved over the non-cooperative case. First, we investigate a scheduling problem where secondary users are interested in immediate rewards. Here, we consider both infinite and finite backlog cases. Then, we formulate another problem where the secondary users are guaranteed a portion of the primary utility, on a long term basis, in return for cooperation. Finally, we present a power allocation problem where the goal is to maximize the expected net benefit defined as utility minus cost of energy. Our proposed scheduling policies are shown to outperform non-cooperative scheduling policies, in terms of expected utility and net benefit, for a given set of feasible constraints. Based on Lyapunov Optimization techniques, we show that our schemes are arbitrarily close to the optimal performance at the price of reduced convergence rate.

Item Type:Article
Uncontrolled Keywords:Cognitive radios, Lyapunov optimization, opportunistic scheduling, resource allocation, spectrum leasing
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5101-6720 Telecommunication
ID Code:23811
Deposited By:Özgür Erçetin
Deposited On:10 Jan 2014 15:35
Last Modified:10 Jan 2014 15:35

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