Robust Transmission Scheduling for UAV-Assisted Millimeter-Wave Train-Ground Communication System

With the explosive growth of mobile data, demand high-speed railway (HSR) passengers for broadband wireless access services urgently needs support ultra-high-speed scenario communication. Millimeter-wave (mmWave) can achieve high data transmission rates, but it is accompanied by propagation loss and vulnerability to blockage. To address this issue, developments directional antennas unmanned aerial vehicles (UAVs) enhance robustness mmWave train-ground communication system. In paper, we propose a UAV MRs relay assistance (UMRA) algorithm effectively overcome link blockage, which maximize number flows on premise meeting QoS requirements channel qualities. First, formulate mixed integer nonlinear programming (MINLP) problem trajectory design scheduling in full-duplex (FD) mode. Then, UMRA, decision based graph theory are proposed, make good tradeoff between computation complexity system performance. Extensive simulation results show that suitable position will greatly improve performance UMRA close optimal solution. Compared with other two existing benchmark schemes, quality large-area completed throughput.