轨道交通mmWave移动中继系统中基于联盟博弈的用户关联
Coalition Game based User Association for mmWave Mobile Relay Systems in Rail Traffic Scenarios
摘要：
轨道交通，特别是高速铁路，是发展国民经济、提升旅客体验的重要基础设施。毫米波（mmWave）通信由于其大带宽而被认为是满足高数据率需求的有前途的技术。然而，由于毫米波通信具有高衰减的特点，移动中继（MR）在本文中被认为是。此外，已经提出了全双工（FD）通信以提高频谱效率。然而，由于速度高，以及穿透损耗的问题，乘客在训练上的服务质量较差。因此，一个有效的用户关联方案在毫米波频段的高速铁路是必要的。在本文中，我们研究了毫米波移动中继系统中的用户关联优化问题，其中MR工作在FD模式。为了最大化系统容量，提出了一种基于联盟形成博弈的协作用户关联方法，并设计了一种联盟形成算法来解决这一具有挑战性的NP难题。我们还证明了算法的收敛性和Nashstable性质。大量的仿真结果表明，该方案在各种网络设置下的系统性能。结果表明，所提出的分布式低复杂度的计划实现了一个接近最优的性能，并优于两个基线计划的平均系统吞吐量。
英文摘要：
Rail transportation, especially, high-speed rails (HSR), is an important infrastructure for the development of national economy and the promotion of passenger experience. Due to the large bandwidth, millimeter wave (mmWave) communication is regarded as a promising technology to meet the demand of high data rates. However, since mmWave communication has the characteristic of high attenuation, mobile relay (MR) is considered in this paper. Also, full-duplex (FD) communications have been proposed to improve the spectral efficiency. However, because of the high speed, as well as the problem of penetration loss, passengers on the train have a poor quality of service. Consequently, an effective user association scheme for HSR in mmWave band is necessary. In this paper, we investigate the user association optimization problem in mmWave mobilerelay systems where the MRs operate in the FD mode. To maximize the system capacity, we propose a cooperative user association approach based on coalition formation game, and develop a coalition formation algorithm to solve the challenging NP-hard problem. We also prove the convergence and Nashstable property of the proposed algorithm. Extensive simulations are done to show the system performance of the proposed scheme under various network settings. It is demonstrated that the proposed distributed low complexity scheme achieves a nearoptimal performance and outperforms two baseline schemes in terms of average system throughput.
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