Asymmetric Coded Caching for Multi-Antenna Location-Dependent Content Delivery

Efficient usage of in-device storage and computation capabilities are key solutions to support data-intensive applications such as immersive digital experience. This paper proposes a location-dependent multi-antenna coded caching -based content delivery scheme tailored specifically for wireless immersive viewing applications. First, a memory assignment phase is performed where the content relevant to the identified wireless bottleneck areas are incentivized. As a result, unequal fractions of location-dependent multimedia content are cached at each user. Then, a novel packet generation process is carried out given asymmetric cache placement. During the subsequent delivery phase, the number of packets transmitted to each user is the same, while the sizes of the packets are proportional to the corresponding location-dependent cache ratios. Finally, each user is served with location-specific content using joint multicast beamforming and multi-rate modulation scheme that simultaneously benefits from global caching and spatial multiplexing gains. Numerical experiments and mathematical analysis demonstrate significant performance gains compared to the state-of-the-art.