2019/04/02 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.1904.01256
openalex publication_date 2019/04/02 · openalex created_date 2022/07/26 · openalex updated_date 2026/07/28
A Fog-Radio Access Network (F-RAN) is studied in which cache-enabled Edge\nNodes (ENs) with dedicated fronthaul connections to the cloud aim at delivering\ncontents to mobile users. Using an information-theoretic approach, this work\ntackles the problem of quantifying the potential latency reduction that can be\nobtained by enabling Device-to-Device (D2D) communication over out-of-band\nbroadcast links. Following prior work, the Normalized Delivery Time (NDT) --- a\nmetric that captures the high signal-to-noise ratio worst-case latency --- is\nadopted as the performance criterion of interest. Joint edge caching, downlink\ntransmission, and D2D communication policies based on compress-and-forward are\nproposed that are shown to be information-theoretically optimal to within a\nconstant multiplicative factor of two for all values of the problem parameters,\nand to achieve the minimum NDT for a number of special cases. The analysis\nprovides insights on the role of D2D cooperation in improving the delivery\nlatency.\n