Recently, as a consequence of the COVID-19 pandemic, dependence on telecommunication for remote working and telemedicine has significantly increased. In cellular networks, incorporation of Unmanned Aerial Vehicles (UAVs) can result in enhanced connectivity for outdoor users due to the high probability of establishing Line of Sight (LoS) links. The UAV's limited battery life and its signal attenuation in indoor areas, however, make it inefficient to manage users' requests in indoor environments. Referred to as the Cluster centric and Coded UAV-aided Femtocaching (CCUF) framework, the network's coverage in both indoor and outdoor environments increases via a two-phase clustering for FAPs' formation and UAVs' deployment. First objective is to increase the content diversity. In this context, we propose a coded content placement in a cluster-centric cellular network, which is integrated with the Coordinated Multi-Point (CoMP) to mitigate the inter-cell interference in edge areas. Then, we compute, experimentally, the number of coded contents to be stored in each caching node to increase the cache-hit ratio, Signal-to-Interference-plus-Noise Ratio (SINR), and cache diversity and decrease the users' access delay and cache redundancy for different content popularity profiles. Capitalizing on clustering, our second objective is to assign the best caching node to indoor/outdoor users for managing their requests. In this regard, we define the movement speed of ground users as the decision metric of the transmission scheme for serving outdoor users' requests to avoid frequent handovers between FAPs and increase the battery life of UAVs. Simulation results illustrate that the proposed CCUF implementation increases the cache hit-ratio, SINR, and cache diversity and decrease the users' access delay, cache redundancy and UAVs' energy consumption.
翻译:最近,由于COVID-19大流行,对远程工作和远程医疗对电信的依赖明显增加。在蜂窝网络中,整合无人驾驶航空飞行器(UAVs)可以提高室外用户的连通性,因为建立Sight线(LOS)链接的可能性很大。由于无人驾驶航空飞行器(UAVs)的电池寿命有限,而且其信号在室内地区的衰减,因此无法有效地管理用户在室内环境中的多样化要求。被称为集群中心点和编码UAV帮助的Femtocaching(CCUF)框架,网络在室内和室外环境中的覆盖面都通过FAPs的编队和UAVs部署的两阶段集群组合而增加。在这方面,我们提议在集束型手机网络中放置编码内容,与协调多点(COMP)相结合,以减轻边缘地区的细胞间干扰。然后,我们计算、实验性地将编码内容储存在每一个正在加速的服务器用户的移动速度上,从而增加FAVALs的存取速度, IMFS-S-S-SIMFI 的用户的存取结果。 向不同的数据库用户表示, 和存储-IMFSIMFIFI-S-real-redial-de-de-de-de-de-de-lide-de-de-lide-lide-lide-lipping list-list-list-lipping lipping the lipping the list-lippinging the listal listal-de lipping the licude listeutal lidal liction lical lical liction liction-de lical lical-de lical-deal-de lical-deal-de lidal-de li lictionsal lical lictionsal-de liction lictions listedal listedal-de listedal lidal-de lidal-de list list listal-de listal-de listal listal-de listal-toal-de del