Opportunistic multichannel access with decentralized channel state information
Opportunistic multichannel access with decentralized channel state information
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DOI：
10.1002/wcm.2348
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发表时间：
2015-02
期刊：
影响因子：
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通讯作者：
Bo Yang;Yanyan Shen;M. Johansson;Cailian Chen;X. Guan
中科院分区：
文献类型：
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作者：
Bo Yang;Yanyan Shen;M. Johansson;Cailian Chen;X. Guan
研究正交频分多址无线网络中上行链路的多址控制问题。为了避免集中式方法带来的大量信息交换，我们将具有竞争能力约束的分散访问控制问题表述为贝叶斯博弈，将时变信道状态信息映射到竞争策略中。通过利用问题结构，如果观察到的信道增益高于预定阈值，则用户以概率1访问信道的策略被证明是最优的。结果表明，阈值策略的能量消耗不会超过随机化策略。然后将博弈等效地重新表述为以分布式方式寻找阈值的博弈，并建立贝叶斯纳什均衡的存在唯一性。提出了一种基于拉格朗日对偶的分布式算法来逼近唯一平衡点，并证明了该算法是全局稳定的。在齐次系统中，与集中式信道分配方案相比，证明了该方案的性能损失是有界的。与其他建议相反，我们的方法允许异构通道状态信息，并在降低功耗的情况下实现相当的吞吐量。版权所有©2013 John Wiley & Sons， Ltd
This paper considers multiaccess control for the uplink in orthogonal frequency division multiple access wireless networks. To avoid the extensive information exchange associated with centralized approaches, we formulate the decentralized access control problem with the contention power constraint as a Bayesian game, mapping time-varying channel state information into contention strategies. By exploiting the problem structure, a strategy where users access the channels with probability one if the observed channel gain is above a predetermined threshold is shown to be optimal. It is also shown that the energy consumption of the threshold strategy will not exceed that of randomized strategies. The game is then equivalently reformulated as one of finding the threshold value in a distributed manner, and the existence and uniqueness of Bayesian Nash equilibria is established. A distributed algorithm based on Lagrange duality is proposed to approach the unique equilibrium, and the algorithm is shown to be globally stable. In a homogeneous system, the performance loss of the proposed scheme is proved to be bounded compared with a centralized channel allocation scheme. Contrary to other proposals, our method allows for heterogeneous channel state information and achieves a comparable throughput with reduced power. Copyright © 2013 John Wiley & Sons, Ltd.