The Advents of Device-to-Device Relaying for Massively Loaded 5G Networks

In one of the several manifestations, 5G networks are required to accommodate a massive number of devices; an order of magnitude compared to today's networks. At the same time, 5G networks will have to observe stringent latency constraints. To that end, one problem that is posed as a potential showstopper is extreme congestion over random access resources in the cellular uplink. Indeed, congestion drags along delay problems. In this paper, the use of network-orchestrated device-to-device (D2D) relaying is advocated for the mitigation of random access congestion. In particular, it is shown that D2D relaying reduces access delay only at high device densities but is rather an overkill for lower densities. For the sake of an objective evaluation, the overhead of device clustering protocols must be accounted for. As such, this paper provides protocol designers with benchmarks on how much protocol overhead can be tolerated. The feasibility of D2D relaying is demonstrated via extensive system-level simulations run on a super computer and based on a foundation of real-life networks parameters.

Gharbieh M, Bader A, ElSawy H, Alouini M-S, Adinoyi A (2017) The Advents of Device-to-Device Relaying for Massively Loaded 5G Networks. GLOBECOM 2017 - 2017 IEEE Global Communications Conference. Available:

This work was funded by STC under grant RGC/3/2374-01-01.

Institute of Electrical and Electronics Engineers (IEEE)

GLOBECOM 2017 - 2017 IEEE Global Communications Conference

Conference/Event Name
2017 IEEE Global Communications Conference, GLOBECOM 2017


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