A location-aware multi-antenna coded caching scheme is proposed for applications with location-dependent data requests, such as wireless immersive experience, where users are immersed in a three-dimensional virtual world. The wireless connectivity conditions vary as the users move within the application area motivating the use of a non-uniform cache memory allocation process to avoid excessive delivery time for users located in wireless bottleneck areas. To this end, a location-aware placement and delivery array (LAPDA) is designed for cache-aided multiantenna data delivery with a fast converging, iterative linear beamforming process. The 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. Our new scheme is suitable for large networks due to its linear transceiver structure and it is not constrained by the number of users, cache size, or the number of antennas at the transmitter, unlike the existing schemes. Despite non-uniform cache placement, the proposed scheme still achieves a significant degree of coded caching gain that is additive to the multiplexing gain and greatly outperforms the conventional symmetric CC schemes in terms of both average and 95-percentile delivery time.

翻译：针对位置相关数据请求的应用场景（如无线沉浸式体验中用户沉浸于三维虚拟世界），提出了一种位置感知的多天线编码缓存方案。随着用户在应用区域内移动，无线连接条件会发生变化，因此需要采用非均匀缓存内存分配过程，以避免为位于无线瓶颈区域的用户带来过长的传输时延。为此，设计了一种位置感知放置与分发阵列（LAPDA），用于缓存辅助的多天线数据传输，并结合快速收敛的迭代线性波束赋形过程。其底层的加权最大-最小发射预编码器设计，使得所提方案能够向连接条件较差的用户传输较少数据量，同时向其他用户传输更大量数据。得益于线性收发机结构，本方案适用于大规模网络，且不像现有方案那样受限于用户数量、缓存大小或发射天线数量。尽管采用了非均匀缓存放置，所提方案仍能实现显著的编码缓存增益，该增益可与复用增益叠加，并在平均传输时延和95百分位传输时延方面显著优于传统对称编码缓存方案。