Caching gain in interference‐limited wireless networks

Abstract

The authors consider the effect of caching in interference‐limited wireless networks where fading is the dominant channel effect. First, the authors propose a one‐hop transmission strategy for cache‐enabled wireless networks, which is based on exploiting multi‐user diversity gain. Then, they derive a closed‐form result for throughput scaling of the proposed scheme in large networks, which reveals the inherent trade‐off between cache memory size and network throughput. Their results show that substantial throughput improvements are achievable in networks with sources equipped with large cache size, compared with previous works where each transmitter could just store one file. Also, the authors provide extensive simulations through which they analyse network throughput and verify their analytical results. Their simulations suggest that the scaling results also hold true even by introducing correlation between channels, making the results more general.