Cache-Aided Full-Duplex Small Cells

TL;DR

This paper demonstrates that cache-aided full-duplex small-cell networks significantly improve network performance and reduce interference by leveraging local content popularity and simultaneous communication with users and backhaul nodes.

Contribution

It introduces a novel caching model for full-duplex small cells based on local popularity and analyzes the resulting throughput gains over cache-free systems.

Findings

Notable throughput improvements observed with cache-aided full-duplex deployment.

Reduced interference footprint in cache-aided full-duplex small-cell networks.

Numerical results validate theoretical performance enhancements.

Abstract

Caching popular contents at the edge of the network can positively impact the performance and future sustainability of wireless networks in several ways, e.g., end-to-end access delay reduction and peak rate increase. In this paper, we aim at showing that non-negligible performance enhancements can be observed in terms of network interference footprint as well. To this end, we consider a full-duplex small-cell network consisting of non-cooperative cache-aided base stations, which communicate simultaneously with both downlink users and wireless backhaul nodes. We propose a novel caching model seeking to mimic a geographical policy based on local files popularity and calculate the corresponding cache hit probability. Subsequently we study the performance of the considered network in terms of throughput gain with respect to its cache-free half-duplex counterpart. Numerical results corroborate our theoretical findings and highlight remarkable performance gains when moving from cache-free to cache-aided full-duplex small-cell networks.