期刊
IEEE TRANSACTIONS ON COMMUNICATIONS
卷 68, 期 4, 页码 2308-2323出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCOMM.2019.2962769
关键词
Device-to-device communication; Interference; Libraries; Transmitters; Receivers; Downlink; Measurement; Caching; D2D communication; F-RAN; C-RAN; latency; zero-forcing; interference alignment
资金
- European Research Council (ERC) [694630, 725731]
- European Research Council (ERC) [694630] Funding Source: European Research Council (ERC)
A Fog-Radio Access Network (F-RAN) is studied in which cache-enabled Edge Nodes (ENs) with dedicated fronthaul connections to the cloud aim at delivering contents to mobile users. Using an information-theoretic approach, this work tackles the problem of quantifying the potential latency reduction that can be obtained by enabling Device-to-Device (D2D) communication over out-of-band broadcast links. Following prior work, the Normalized Delivery Time (NDT) - a metric that captures the high signal-to-noise ratio worst-case latency - is adopted as the performance criterion of interest. Joint edge caching, downlink transmission, and D2D communication policies based on compress-and-forward are proposed that are shown to be information-theoretically optimal to within a constant multiplicative factor of two for all values of the problem parameters, and to achieve the minimum NDT for a number of special cases. The analysis provides insights on the role of D2D cooperation in improving the delivery latency.
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