We study an urban wireless network in which cache-enabled UAV-Access points (UAV-APs) and UAV-Base stations (UAV-BSs) are deployed to provide higher throughput and ad-hoc coverage to users on the ground. The cache-enabled UAV-APs route the user data to the core network via either terrestrial base stations (TBSs) or backhaul-enabled UAV-BSs through an xHaul link. First, we derive the association probabilities in the access and xHaul links. Interestingly, we show that to maximize the line-of-sight (LoS) unmanned aerial vehicle (UAV) association, densifying the UAV deployment may not be beneficial after a threshold. Then, we obtain the signal to interference noise ratio (SINR) coverage probability of the typical user in the access link and the tagged UAV-AP in the xHaul link, respectively. The SINR coverage analysis is employed to characterize the successful content delivery probability by jointly considering the probability of successful access and xHaul transmissions and successful cache-hit probability. We numerically optimize the distribution of frequency resources between the access and the xHaul links to maximize the successful content delivery to the users. For a given storage capacity at the UAVs, our study prescribes the network operator optimal bandwidth partitioning factors and dimensioning rules concerning the deployment of the UAV-APs.
翻译:我们研究一个城市无线网络,在该网络中部署缓存式无人驾驶飞行器(UAV-APs)和无人驾驶飞行器(UAV-BS)协会,以向地面用户提供更高的输送量和临时热量覆盖;缓存式无人驾驶飞行器(UAV-BS)将用户数据通过地面基地站(TBS)或反光自动驾驶无人驾驶飞行器(UAV-AV-BS)连接到核心网络;首先,我们通过XHaul链接,通过缓存式无人驾驶飞行器(UAV)连接点和无人驾驶飞行器(UAV)连接点的关联概率来得出相关数据;有趣的是,我们显示最大限度地扩大无人驾驶飞行器(UAV)的部署力度在门槛之后可能没有好处;然后,我们获得信号,通过连接连接点的典型用户的噪音率覆盖率和在XHaul链接中贴上标记的UAVA-A-A-A-A的覆盖度,通过联合考虑成功进入的可能性和XHaul传输机(LAAAAAAAAAA)交付网的成功访问和成功发送能力的交付能力,我们对AAAAAAAA的频率流流流流流流流流流流数据进行了最优化的频率流数据流流与交付数据进行最优化的分布。