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Providing wireless coverage to high-rise buildings using UAVs

机译：使用无人机为高层建筑提供无线覆盖

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Unmanned aerial vehicles (UAVs) can be used as aerial wireless base stations when cellular networks go down. Prior studies on UAV-based wireless coverage typically consider an Air-to-Ground path loss model, which assumes that the users are outdoor and they are located on a 2D plane. In this paper, we propose using a single UAV to provide wireless coverage for indoor users inside a high-rise building under disaster situations (such as earthquakes or floods), when cellular networks are down. First, we present a realistic Outdoor-Indoor path loss model and describe the tradeoff introduced by this model. Then, we study the problem of efficient UAV placement, where the objective is to minimize the total transmit power required to cover the entire high-rise building. The formulated problem is non-convex and is generally difficult to solve. To that end, we consider two cases of practical interest and provide the efficient solutions to the formulated problem under these cases. In the first case, we aim to find the minimum transmit power such that an indoor user with the maximum path loss can be covered. In the second case, we assume that the locations of indoor users are symmetric across the dimensions of each floor.
机译：当蜂窝网络故障时，无人飞行器（UAV）可以用作空中无线基站。先前基于无人机的无线覆盖范围的研究通常会考虑空对地路径损耗模型，该模型假设用户位于室外且位于2D平面上。在本文中，我们建议使用单个无人机在蜂窝网络故障的灾难情况下（例如地震或洪水）为高层建筑内的室内用户提供无线覆盖。首先，我们提出了一个现实的室外-室内路径损耗模型，并描述了该模型引入的折衷方案。然后，我们研究有效放置无人机的问题，其目的是使覆盖整个高层建筑所需的总发射功率最小化。提出的问题是非凸的，通常很难解决。为此，我们考虑了两个具有实际意义的案例，并为这些案例下提出的问题提供了有效的解决方案。在第一种情况下，我们的目标是找到最小的发射功率，从而可以覆盖路径损耗最大的室内用户。在第二种情况下，我们假设室内用户的位置在每个楼层的尺寸上都是对称的。

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