Fundamental Latency Limits for D2D-Aided Content Delivery in Fog\n Wireless Networks

2018/01/02 by Roy Karasik, Osvaldo Simeone, Karasik, Roy +3
Computer Science · Engineering · #Advanced MIMO Systems Optimization #Caching and Content Delivery #Cooperative Communication and Network Coding #FOS: Computer and information sciences #Information Theory (cs.IT)

paper · pdf · doi:10.48550/arxiv.1801.00754

openalex publication_date 2018/01/02 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

Device-to-Device (D2D) communication can support the operation of cellular\nsystems by reducing the traffic in the network infrastructure. In this paper,\nthe benefits of D2D communication are investigated in the context of a\nFog-Radio Access Network (F-RAN) that leverages edge caching and fronthaul\nconnectivity for the purpose of content delivery. Assuming offline caching,\nout-of-band D2D communication, and an F-RAN with two edge nodes and two user\nequipments, an information-theoretically optimal caching and delivery strategy\nis presented that minimizes the delivery time in the high signal-to-noise ratio\nregime. The delivery time accounts for the latency caused by fronthaul,\ndownlink, and D2D transmissions. The proposed optimal strategy is based on a\nnovel scheme for an X-channel with receiver cooperation that leverages tools\nfrom real interference alignment. Insights are provided on the regimes in which\nD2D communication is beneficial.\n

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