arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1902.06353cs.ITcs.LGeess.SPmath.IT
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共享频谱信道分配的分布式学习算法

Distributed Learning for Channel Allocation Over a Shared Spectrum

Bar-Ilan University(巴伊兰大学);BITS Pilani(比尔拉科学技术学院皮拉尼分校);Nanyang Technological University(南洋理工大学)

S. M. Zafaruddin, Ilai Bistritz, Amir Leshem, Dusit Niyato

摘要:

信道分配是将信道分配给用户的任务,使得某些目标(例如,和速率)被最大化。在诸如蜂窝网络的集中式网络中,该任务由基站执行,基站从用户收集信道状态信息(CSI)并计算最优解。在诸如ad-hoc和设备到设备(D2 D)网络之类的分布式网络中,不存在基站,并且在用户之间传送全局CSI是昂贵的或根本不切实际的。当CSI是时变的并且用户未知时,用户面临着在线学习信道统计信息并收敛到良好信道分配的挑战。这引入了具有多个决策者的多臂强盗(MAB)场景。如果两个或两个以上的用户选择相同的信道,则会发生冲突,并且他们都获得零奖励。我们提出了一种分布式信道分配算法,每个用户运行并收敛到最优分配,同时实现了O \left(\log T \right)的顺序最优遗憾。该算法是基于载波侦听多址接入(CSMA)实现的分布式拍卖算法。它不需要用户之间的任何信息交换。用户只需要一次观察一个信道,并感知该信道上是否有传输,而无需解码传输或识别传输用户。我们使用模拟的LTE和5G信道演示了我们的算法的性能。

英文摘要:

Channel allocation is the task of assigning channels to users such that some objective (e.g., sum-rate) is maximized. In centralized networks such as cellular networks, this task is carried by the base station which gathers the channel state information (CSI) from the users and computes the optimal solution. In distributed networks such as ad-hoc and device-to-device (D2D) networks, no base station exists and conveying global CSI between users is costly or simply impractical. When the CSI is time varying and unknown to the users, the users face the challenge of both learning the channel statistics online and converge to a good channel allocation. This introduces a multi-armed bandit (MAB) scenario with multiple decision makers. If two users or more choose the same channel, a collision occurs and they all receive zero reward. We propose a distributed channel allocation algorithm that each user runs and converges to the optimal allocation while achieving an order optimal regret of O\left(\log T\right). The algorithm is based on a carrier sensing multiple access (CSMA) implementation of the distributed auction algorithm. It does not require any exchange of information between users. Users need only to observe a single channel at a time and sense if there is a transmission on that channel, without decoding the transmissions or identifying the transmitting users. We demonstrate the performance of our algorithm using simulated LTE and 5G channels.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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