Resource allocation scheme for device-to-device communication underlying LTE downlink network

Future cellular networks such as IMT-Advanced are expected to allow Device-to-Device (D2D) communication as an underlay. During the downlink period, both of the D2D receiver and cellular user will suffer from interference caused by radio resource sharing. In this paper, a joint resource allocation and resource reuse scheme is investigated, in which resource allocation to cellular users is employed on proportional fair algorithm and resource reuse to D2D users is employed on a greedy heuristic algorithm. The greedy heuristic algorithm determines the D2D mode is appropriate or not by path loss comparison, then decreases the interference to cellular user by selection of the minimum channel gain between cellular user and D2D transmitter each time. System simulations in two different scenarios demonstrate that sum throughput of cellular user and D2D pair is improved using the proposed scheme, and the interference to cellular user is under control.