On selecting duplex-mode and resource allocation strategy in full duplex D2D communication

In this paper, we study merging Device-to-Device (D2D) communication with full-duplex (FD) communications under different resource allocation strategies, i.e., reuse, dedicated and cellular. In reuse strategy, the D2D communication takes place directly between D2D pair sharing the whole resources together with the cellular user, while in dedicated strategy, the direct D2D communication is given half of the resources. Enabling cellular strategy, however, the data of D2D communication goes through the Base Station (BS). In this study, we take into account both FD and half-duplex (HD) modes incorporating into reuse, dedicated and cellular strategies, and formulate the resource allocation problem in a two-tier system. Aiming to maximize the system throughput, we analyze the system adopting different duplex-modes and resource allocation strategies. Simulation results demonstrate that the superiority of FD communication is contingent to self-interference (SI) cancelation factor. Through deriving geographical patterns, we analyze the effect of location of cellular user on mode selection strategy taken by D2D pair to pick the best strategy. The results show that the dedicated strategy is the best choice when the cellular user is close to the D2D pair, while the reuse strategy is dominant, when opposite state holds. Furthermore, the results reveal that the system achieves the maximum throughput under reuse strategy when the cellular user is located close to BS.