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In this paper, we investigate maximum distance separable (MDS) codes basedgroup coded caching in fog radio access networks (F-RANs). The goal is tominimize the average fronthaul rate under nonuniform file popularity. Firstly,an MDS codes and file grouping based coded placement scheme is proposed toprovide coded packets and allocate more cache to the most popular filessimultaneously. Next, a fog access point (F-AP) grouping based coded deliveryscheme 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 areoptimized to fully utilize the gains brought by MDS codes and file grouping.Simulation results show that our proposed scheme obtains significantperformance improvement over several existing caching schemes in terms offronthaul rate reduction.

MDS Codes Based Group Coded Caching in Fog Radio Access Networks