RAM: Resource Allocation in Mobility for Device-to-Device Communications

As one of the key technologies of the Long Term Evolution (LTE)-Advanced networks, Device-to-Device (D2D) communication meets the requirement for higher data rate with the increase of local communication services. But it has to deal with new interference between cellular network and D2D devices. Several schemes have been proposed to cancel or mitigate such interference by proper power control or resource allocation. However, there is little discussion about the resource allocation considering user mobility. In this paper, RAM, a novel three-step resource allocation scheme, is proposed that makes D2D communications adapt well to the user mobility. In this solution, it first performs admission control based on the velocity judgment and then selects proper resource allocation mode for each admissible D2D pair, which includes the dedicated resource mode and the reused resources mode. The last step is to select the suitable cellular user (CU) partners for each admissible D2D pair in the reused resources mode. Simulation results show that RAM balances the velocity and user throughput and D2D mean throughput gain could improve 3Mbps compared with the dedicated resource mode.