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Fog Radio Access Network (F-RAN) architectures can leverage both cloudprocessing and edge caching for content delivery to the users. To this end,F-RAN utilizes caches at the edge nodes (ENs) and fronthaul links connecting acloud processor to ENs. Assuming time-invariant content popularity, existinginformation-theoretic analyses of content delivery in F-RANs rely on offlinecaching with separate content placement and delivery phases. In contrast, thiswork focuses on the scenario in which the set of popular content istime-varying, hence necessitating the online replenishment of the ENs' cachesalong with the delivery of the requested files. The analysis is centered on thecharacterization of the long-term Normalized Delivery Time (NDT), whichcaptures the temporal dependence of the coding latencies accrued acrossmultiple time slots in the high signal-to-noise ratio regime. Online edgecaching and delivery schemes are investigated for both serial and pipelinedtransmission modes across fronthaul and edge segments. Analytical resultsdemonstrate that, in the presence of a time-varying content popularity, therate of fronthaul links sets a fundamental limit to the long-term NDT of F- RANsystem. Analytical results are further verified by numerical simulation,yielding important design insights.

Online Edge Caching and Wireless Delivery in Fog-Aided Networks with Dynamic Content Popularity