Design of device-to-device decision schemes for intra-eNB traffic in LTE networks

In LTE networks, even if two communicating UEs are closed enough, the traffic must go around core network. If Device-to-Device (D2D) communications used, two nearby UEs can directly exchange data, rather than passing core network to reduce loading of core network. However, D2D communications are not always gaining benefit. This paper proposes two mechanisms, namely Capacity-based scheme and Delay-based scheme, to assist the decision-making between D2D and Cellular transmission. Simulation results show that the proposed D2D mechanisms not only reduce the transmission delay but also improve the throughput compared to conventional mechanism.