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• W2077975268 abstract "We address the challenge of energy efficiency in hierarchical spectrum sharing networks with dynamic traffic. We consider a primary and a cognitive secondary transmitter–receiver pair, where the secondary transmitter can utilize cooperative transmission to relay primary traffic while superimposing its own information. The secondary user meets a dilemma in this scenario. By choosing cooperation, it can transmit a packet immediately, but it has to bear the additional cost of relaying. Otherwise, it can wait for the primary user to become idle, which increases the queuing delay that secondary packets experience. To solve this dilemma and trade off delay and energy consumption, we propose dynamic cooperative secondary access control that takes the state of the spectrum sharing network into account. We formulate the problem as a Markov decision process and prove the existence of a stationary policy that is average cost optimal. We evaluate reinforcement learning to find optimal transmission strategy when the traffic and link statistics are not known. We demonstrate that dynamic cooperation is necessary for the secondary system to be able to adapt to changing network conditions and show that optimal sequential decision can significantly improve the tradeoff of the energy consumption and the delay." @default.
• W2077975268 created "2016-06-24" @default.
• W2077975268 creator A5052787170 @default.
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• W2077975268 date "2014-11-01" @default.
• W2077975268 modified "2023-09-24" @default.
• W2077975268 title "Dynamic Cooperative Secondary Access in Hierarchical Spectrum Sharing Networks" @default.
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• W2077975268 doi "https://doi.org/10.1109/twc.2014.2333744" @default.
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