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A Fog-Radio Access Network (F-RAN) is studied in which cache-enabled EdgeNodes (ENs) with dedicated fronthaul connections to the cloud aim at deliveringcontents to mobile users. Using an information-theoretic approach, this worktackles the problem of quantifying the potential latency reduction that can beobtained by enabling Device-to-Device (D2D) communication over out-of-bandbroadcast links. Following prior work, the Normalized Delivery Time (NDT) --- ametric that captures the high signal-to-noise ratio worst-case latency --- isadopted as the performance criterion of interest. Joint edge caching, downlinktransmission, and D2D communication policies based on compress-and-forward areproposed that are shown to be information-theoretically optimal to within aconstant multiplicative factor of two for all values of the problem parameters,and to achieve the minimum NDT for a number of special cases. The analysisprovides insights on the role of D2D cooperation in improving the deliverylatency.

How Much Can D2D Communication Reduce Content Delivery Latency in Fog Networks with Edge Caching?