A location-aware coded caching scheme is introduced for applications with location-dependent data requests. An example of such an application is a wireless immersive experience, where users are immersed in a three-dimensional virtual world and their viewpoint varies as they move within the application area. As the wireless connectivity condition of the users also varies with their location due to small- and large-scale fading, a non-uniform memory allocation process is used to avoid excessive delivery time in the bottleneck areas. Then, a well-defined location-aware placement and delivery array (LAPDA) is used for data delivery to utilize unicast transmission with a fast converging, iterative linear beamforming process. An underlying weighted max-min transmit precoder design enables the proposed scheme to serve users in poor connectivity areas with smaller amounts of data while simultaneously delivering larger amounts to other users. Unlike previous studies in the literature, our new scheme is not constrained by the number of users or network parameters (users' cache capacity, number of antennas at the transmitter, etc.) and is suitable for large networks due to its linear transceiver structure. Despite non-uniform cache placement, the proposed scheme achieves a coded caching gain that is additive to the multiplexing gain and outperforms conventional symmetric CC schemes with only a moderate degree of freedom (DoF) loss.

翻译：本文提出了一种面向位置感知数据请求应用的位置感知编码缓存方案。典型应用场景为无线沉浸式体验，用户沉浸于三维虚拟世界中，其视点随在应用区域内的移动而变化。由于小尺度与大尺度衰落导致用户的无线连接状况随位置变化，采用非均匀内存分配策略以避免瓶颈区域过长的传输延迟。随后，利用定义明确的位置感知放置与传输数组（LAPDA）进行数据分发，采用快速收敛的迭代线性波束赋形实现单播传输。底层加权最大最小传输预编码器设计使本方案能为处于差连接区域的用户传送较少数据量，同时为其他用户传送更大数据量。与现有文献不同，本方案不受用户数量或网络参数（如用户缓存容量、发射端天线数等）的限制，其线性收发机结构适用于大规模网络。尽管采用非均匀缓存放置，该方案仍能实现与复用增益可加和的编码缓存增益，且仅以适度自由度（DoF）损失优于传统对称编码缓存方案。