Online Edge Caching in Fog-Aided Wireless Network
Seyyed Mohammadreza Azimi, Osvaldo Simeone, Avik Sengupta, Ravi, Tandon

TL;DR
This paper analyzes online caching strategies in fog radio access networks, focusing on minimizing delivery latency amid time-varying content popularity, and compares reactive and proactive caching schemes to offline benchmarks.
Contribution
It introduces an analytical framework for online caching in F-RANs, characterizing long-term delivery latency and comparing different caching strategies.
Findings
Reactive caching outperforms offline schemes in dynamic environments.
Proactive caching reduces long-term latency with accurate popularity prediction.
Analytical results match numerical simulations, validating the proposed models.
Abstract
In a Fog Radio Access Network (F-RAN) architecture, edge nodes (ENs), such as base stations, are equipped with limited-capacity caches, as well as with fronthaul links that can support given transmission rates from a cloud processor. Existing information-theoretic analyses of content delivery in F-RANs have focused on offline caching with separate content placement and delivery phases. In contrast, this work considers an online caching set-up, in which the set of popular files is time-varying and both cache replenishment and content delivery can take place in each time slot. The analysis is centered on the characterization of the long-term Normalized Delivery Time (NDT), which captures the temporal dependence of the coding latencies accrued across multiple time slots in the high signal-to- noise ratio regime. Online caching and delivery schemes based on reactive and proactive caching…
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Taxonomy
TopicsCaching and Content Delivery · Cooperative Communication and Network Coding · Opportunistic and Delay-Tolerant Networks
