面向接入回传一体化的毫米波空地网络建模与分析

无人机(UAV)作为空中基站有望成为传统地面网络的有力补充，以提供灵活覆盖和容量增强的解决方案。然而，大多现有研究忽略空中基站的无线回传这一实际因素对网络性能和用户体验的影响。为此，考虑接入回传一体化的空地毫米波蜂窝网络场景，其中无人机提供热点流量传输服务，地面基站(TBS)提供无人机回传链路并且服务非热点区域用户，以及接入和回传采用正交资源分配方法。针对该场景，提取地面基站、无人机和用户的空间分布特性，以及不同链路信号的传播特性，该文采用随机几何理论建立与之匹配的毫米波空地网络模型，推导了非热点用户的接入链路覆盖率和热点用户的接入回传链路的联合覆盖率。进一步地，基于地面基站和无人机的负载特性分析，推导了两种用户的速率覆盖率以及总体用户性能。基于所提分析框架，该文研究了关键系统参数，如接入链路频谱分配比例、无人机密度和热点用户密度等对用户性能的影响。

Modeling and Analysis of Millimeter-wave Air-terrestrial Networks with Integrated Access and Backhaul

A millimeter-wave air-terrestrial network with integrated access and backhaul is considered to investigate the impact of the Unmanned Aerial Vehicle (UAV) wireless backhaul on the network performance and user experience, where UAVs provide hotspot traffic services, Terrestrial Base Stations (TBSs) provide UAV backhaul links and serve users in non-hotspot areas, and a spectrum partitioning resource allocation method is considered for the access and backhaul links. For this scenario, a stochastic geometry-based framework is established to model the millimeter wave air-ground network, and derive the coverage probabilities of both users. Furthermore, based on the load analysis of TBSs and UAVs, the rate coverage performances are provided as well as the overall user performance. Based on the proposed analytical framework, the impacts of key system parameters, such as access link spectrum allocation ratio, UAV, and hotspot user densities, on user performance are studied.