As the standardization of network-assisted device-to- device (D2D) communications by the 3rd Generation Partnership Project progresses, the research community has started to explore the technology potential of new advanced features that will largely impact the performance of 5G networks.

For 5G, D2D is becoming an integrative term of emerging technologies that take advantage of the proximity of communicating entities in licensed and unlicensed spectra. The European 5G research project Mobile and Wireless Communication Enablers for the 2020 Information Society (METIS) has identified advanced D2D as a key enabler for a variety of 5G services, including cellular coverage extension, social proximity and communicating vehicles. In this paper, we review the METIS D2D technology components in three key areas of proximal communications – network-assisted multi-hop, full-duplex, and multi-antenna D2D communications – and argue that the advantages of properly combining cellular and ad hoc technologies help to meet the challenges of the information society beyond 2020.


Gábor Fodor, Ericsson Research, Sandra Roger, Universitat Politecnica de Valencia, Nandana Rajatheva, University of Oulu, Finland, Ben Slimane, Royal Institute of Technology, Stockholm, Tommy Svensson, Chalmers University of Technology, Petar Popovski, Aalborg University, José Mairton B. da Silva Jr., Royal Institute of Technology, Stockholm, Samad Ali, University of Oulu

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Published in: IEEE Access (Volume: 4)

Page(s): 3 288–3 299

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