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Device-to-Device communications represent a paradigm shift in cellularnetworks. In particular, analytical results on D2D performance for offloadingand relay are very promising, but no experimental evidence validates theseresults to date. This paper is the first to provide an experimental analysis ofoutband D2D relay schemes. Moreover, we design DORE, a complete framework forhandling channel opportunities offered by outband D2D relay nodes. DOREconsists of resource allocation optimization tools and protocols suitable tointegrate QoS-aware opportunistic D2D communications within the architecture of3GPP Proximity-based Services. We implement DORE using an SDR framework toprofile cellular network dynamics in the presence of opportunistic outband D2Dcommunication schemes. Our experiments reveal that outband D2D communicationsare suitable for relaying in a large variety of delay-sensitive cellularapplications, and that DORE enables notable gains even with a few active D2Drelay nodes.

DORE: An Experimental Framework to Enable Outband D2D Relay in Cellular Networks