Deploying drone mounted base stations (DBSs) can quickly recover communications of mobile users (MUs) in a disaster struck area. That is, DBSs can act as relay nodes to transmit data from remote working base stations (which are located out of the disaster struck area) to MUs. Since DBSs could be deployed very close to MUs, the access link data rates between DBSs and MUs are well provisioned. However, DBSs may be far away from the remote working base stations, and thus the backhaul link data rate between a DBS and the remote working base station could be throttled. Free Space Optics (FSO), which has been demonstrated to provision high speed point-to-point wireless communications, can be leveraged to improve the capacity of the backhaul link. Since FSO requires line-of-sight between a DBS and a remote working macro base station, DBSs have to be carefully deployed. In this paper, we design a QoS awaRe dronE base Station plaCement and mobile User association stratEgy (RESCUE) in the context of FSO based drone assisted mobile access networks to jointly optimize the DBS deployment, MU association, and bandwidth allocation such that the number of served MUs in the disaster struck area is maximized. The performance of RESCUE is validated via extensive simulations.

中文翻译：

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基于 FSO 的无人机辅助紧急通信移动接入网络

部署无人机基站（DBS）可以快速恢复受灾地区移动用户（MU）的通信。也就是说，DBS 可以充当中继节点，将数据从远程工作基站（位于受灾地区之外）传输到 MU。由于 DBS 可以部署在非常靠近 MU 的位置，DBS 和 MU 之间的接入链路数据速率得到了很好的配置。然而，DBS可能远离远程工作基站，因此DBS和远程工作基站之间的回程链路数据速率可能被节流。自由空间光学 (FSO) 已被证明可提供高速点对点无线通信，可用于提高回程链路的容量。由于 FSO 需要 DBS 和远程工作宏基站之间的视线，必须谨慎部署 DBS。在本文中，我们在基于 FSO 的无人机辅助移动接入网络的背景下设计了 QoS 感知的无人机基站部署和移动用户关联策略（RESCUE），以共同优化 DBS 部署、MU 关联和带宽分配，使得灾区服务的动车组最大化。RESCUE 的性能通过广泛的模拟得到验证。