Journal
IEEE TRANSACTIONS ON COGNITIVE COMMUNICATIONS AND NETWORKING
Volume 9, Issue 3, Pages 593-603Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCCN.2023.3237578
Keywords
Sensors; Channel estimation; Change detection algorithms; Dynamic spectrum access; Protocols; Probability; Synchronization; multi-armed bandit; non-stationary environment; Thompson sampling
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In dynamic spectrum access (DSA), unlicensed secondary users (SUs) estimate the idle probabilities of primary channels and opportunistically access the channel with the highest idle probability for transmission. This paper investigates DSA in non-stationary environments, proposing Thompson sampling based methods for both single-SU and multi-SU scenarios. The proposed methods outperform existing ones in terms of successful transmission ratio in various network settings.
In dynamic spectrum access (DSA), unlicensed secondary users (SUs) estimate the idle probabilities of primary channels by using historical sensing results and opportunistically access the channel with the highest idle probability for transmission. Due to the rapid traffic changes and irregular user mobility, primary channels can be highly dynamic and their idle probabilities are generally time-varying. In this paper, we investigate DSA in non-stationary environments. Specifically, we consider two channel state models, i.e., the non-stationary Bernoulli model with a time-varying mean and the non-stationary Markovian model with a time-varying transition matrix. For the single-SU scenario, we propose a Thompson sampling based method with a change detection technique, which is capable of detecting the variations of channel statistics and adjusting the channel access strategy accordingly. For the multi-SU scenario, we propose a Thompson sampling based collision alleviation method to coordinate the transmissions of SUs, which does not need any prior protocol or information exchange among SUs. Numerical results show that the proposed methods outperform the existing ones in terms of successful transmission ratio in various network settings.
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