论文标题
通过HAPS-RIS超越细胞通信
Beyond-Cell Communications via HAPS-RIS
论文作者
论文摘要
城市区域中不断增加的用户和新服务可以导致地面基站（BSS）变得超载，因此，一些用户无法获得。更复杂的是，城市地区的用户可能会面临严重的阴影和障碍，这意味着某些用户没有获得所需的服务质量（QoS）。由可重新配置智能表面（RIS）的能源和成本优势以及高空平台站（HAPS）的优势，包括其宽阔的足迹和强烈的视线（LOS）链接，我们建议使用Risaid haps来为陷入困境的用户提供服务。更具体地说，我们建议通过配备RIS（HAPS-RIS）的HAPS专用控制站（CS）为滞留的用户提供服务。通过这种方法，用户不受其所属细胞服务的限制；因此，我们将这种方法称为“超越细胞交流”。正如我们在本文中所展示的那样，超越细胞通信与传统的地面网络同时起作用，以支持未发现或无关的用户。引入了基于不同网络目标的用户的最佳传输功率和RIS单元分配策略。数值结果证明了拟议的超越细胞沟通方法的好处。此外，结果提供了有关不同优化目标及其与最低服务质量（QoS）和网络资源（例如传输功率和反射器数量）的相互作用的见解。
The ever-increasing number of users and new services in urban regions can lead terrestrial base stations (BSs) to become overloaded and, consequently, some users to go unserved. Compounding this, users in urban areas can face severe shadowing and blockages, which means that some users do not receive a desired quality of service (QoS). Motivated by the energy and cost benefits of reconfigurable intelligent surfaces (RIS) and the advantages of high altitude platform stations (HAPS), including their wide footprint and strong line-of-sight (LoS) links, we propose a solution to service the stranded users using the RISaided HAPS. More specifically, we propose to service the stranded users by a dedicated control station (CS) via a HAPS equipped with RIS (HAPS-RIS). Through this approach, users are not restricted from being serviced by the cell they belong to; hence, we refer to this approach as beyond-cell communication. As we demonstrate in this paper, beyond-cell communication works in tandem with legacy terrestrial networks to support uncovered or unserved users. Optimal transmit power and RIS unit assignment strategies for the users based on different network objectives are introduced. Numerical results demonstrate the benefits of the proposed beyond-cell communication approach. Moreover, the results provide insights into the different optimization objectives and their interplay with minimum quality-of-service (QoS) and network resources, such as transmit power and the number of reflectors.
