论文标题
利用随机位置的障碍物，以大规模部署智能表面
Exploiting Randomly-located Blockages for Large-Scale Deployment of Intelligent Surfaces
论文作者
论文摘要
下一代无线网络的有前途的技术之一是可重新配置的智能表面（RISS）。该技术提供了平面表面，能够操纵撞击信号的反射波，从而导致更可控制的无线环境。这种技术的一种潜在用例是在没有直接LOS渠道的移动用户和基站（BSS）之间提供间接视线（LOS）链接。充当通信链接（例如建筑物或树木）的障碍物的对象可以配备RISS，以通过提供额外的间接LOS-LINK来提高蜂窝网络的覆盖范围。在本文中，我们使用随机几何形状的工具来研究RISS大规模部署对蜂窝网络性能的影响。特别是，我们使用Line Boolean模型对障碍物进行建模。对于此设置，我们研究了将障碍物的子集用RISS配备的如何增强细胞网络的性能。我们首先得出盲点与总面积的比率。接下来，我们得出了典型的移动用户使用RIS与BS关联的概率。最后，我们得出了典型用户及其相关BS之间路径损失的概率分布。我们从提出的分析中汲取了多个有用的系统级见解。例如，我们表明RISS的部署高度改善了BSS的覆盖区域。此外，我们表明，为了确保盲点与总面积的比率低于10^5，当阻塞的密度为300块/km^2至490 riss/km^2时，RISS的所需密度从仅6 RISS/km2增加。
One of the promising technologies for the next generation wireless networks is the reconfigurable intelligent surfaces (RISs). This technology provides planar surfaces the capability to manipulate the reflected waves of impinging signals, which leads to a more controllable wireless environment. One potential use case of such technology is providing indirect line-of-sight (LoS) links between mobile users and base stations (BSs) which do not have direct LoS channels. Objects that act as blockages for the communication links, such as buildings or trees, can be equipped with RISs to enhance the coverage probability of the cellular network through providing extra indirect LoS-links. In this paper, we use tools from stochastic geometry to study the effect of large-scale deployment of RISs on the performance of cellular networks. In particular, we model the blockages using the line Boolean model. For this setup, we study how equipping a subset of the blockages with RISs will enhance the performance of the cellular network. We first derive the ratio of the blind-spots to the total area. Next, we derive the probability that a typical mobile user associates with a BS using an RIS. Finally, we derive the probability distribution of the path-loss between the typical user and its associated BS. We draw multiple useful system-level insights from the proposed analysis. For instance, we show that deployment of RISs highly improves the coverage regions of the BSs. Furthermore, we show that to ensure that the ratio of blind-spots to the total area is below 10^5, the required density of RISs increases from just 6 RISs/km2 when the density of the blockages is 300 blockage/km^2 to 490 RISs/km^2 when the density of the blockages is 700 blockage/km^2.
