Network coding schemes for D2D communications based relaying for cellular coverage extension

Abstract

Althoughnetwork-assisted device-to-device (D2D) communications are known to improve the spectral and energy\ud efficiency of proximal communications, the performance of cooperative D2D schemes in licenced spectrum is less understood\ud when employed to extend the coverage of cellular networks. In this paper, we study the performance of D2D-based\ud range extension in terms of sum rate and power efficiency when a relaying user equipment (UE) helps to improve the coverage\ud for cell edge UEs. In our design, the relaying UE may have own traffic to transmit and receive to/from the cellular\ud base station (BS) and can operate either in amplify-and-forward (AF) or decode-and-forward (DF) modes and can make\ud use of either digital or analogue physical (PHY) layer network coding. In this rather general setting, we propose mode\ud selection, resource allocation and power control schemes and study their performance by means of system simulations.\ud We find that the performance of the DF scheme with network coding is superior both to the traditional cellular and the\ud AF-based relaying schemes, including AF with two-slot or three-slot PHY layer network codin

Coverage Optimization with a Dynamic Network of Drone Relays

“…These modes have been widely studied in literature. Researchers have studied crucial matters in current networks, such as spectral efficiency, power efficiency, Quality-of-Service (QoS) [21], cellular coverage [22], network offloading [23], etc. Each mode enjoys technological properties and offers clearly distinct medium access opportunities, which originates a discussion about which D2D mode fits better in a cellular network [20].…”