MDS Codes Based Group Coded Caching in Fog Radio Access Networks

TL;DR

This paper proposes an MDS code-based group coded caching scheme for fog radio access networks that reduces fronthaul rate by optimizing cache placement and delivery strategies considering nonuniform file popularity.

Contribution

It introduces a novel coded caching scheme combining MDS codes and file grouping, with a closed-form fronthaul rate expression and parameter optimization for improved performance.

Findings

Significant reduction in fronthaul rate compared to existing schemes

Effective utilization of MDS codes and file grouping in caching

Closed-form expression for average fronthaul rate

Abstract

In this paper, we investigate maximum distance separable (MDS) codes based group coded caching in fog radio access networks (F-RANs). The goal is to minimize the average fronthaul rate under nonuniform file popularity. Firstly, an MDS codes and file grouping based coded placement scheme is proposed to provide coded packets and allocate more cache to the most popular files simultaneously. Next, a fog access point (F-AP) grouping based coded delivery scheme is proposed to meet the requests for files from different groups. Furthermore, a closed-form expression of the average fronthaul rate is derived. Finally, the parameters related to the proposed coded caching scheme are optimized to fully utilize the gains brought by MDS codes and file grouping. Simulation results show that our proposed scheme obtains significant performance improvement over several existing caching schemes in terms of fronthaul rate reduction.