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The fifth generation (5G) of cellular systems is introducing Ultra-ReliableLow-Latency Communications (URLLC) services alongside more conventionalenhanced Mobile BroadBand (eMBB) traffic. Furthermore, the 5G cellulararchitecture is evolving from a base station-centric deployment to a fog-likeset-up that accommodates a flexible functional split between cloud and edge. Inthis paper, a novel solution is proposed that enables the non-orthogonalcoexistence of URLLC and eMBB services by processing URLLC traffic at the EdgeNodes (ENs), while eMBB communications are handled centrally at a cloudprocessor as in a Cloud-Radio Access Network (C-RAN) system. This solutionguarantees the low-latency requirements of the URLLC service by means of edgeprocessing, e.g., for vehicle-to-cellular use cases, as well as the highspectral efficiency for eMBB traffic via centralized baseband processing. Bothuplink and downlink are analyzed by accounting for the heterogeneousperformance requirements of eMBB and URLLC traffic and by considering practicalaspects such as fading, lack of channel state information for URLLCtransmitters, rate adaptation for eMBB transmitters, finite fronthaul capacity,and different coexistence strategies, such as puncturing.

Non-Orthogonal Multiplexing of Ultra-Reliable and Broadband Services in Fog-Radio Architectures