Fig. 3From: Residual energy maximization for NOMA-enabled UAV-assisted data collection network: trajectory optimization and resource allocationUAV trajectory under different data size C. Red line with triangle—C = 1 MB—the optimal UAV trajectory with C = 1 MB; green line with circle—C = 2 MB—the optimal UAV trajectory with C = 2 MB and blue line with diamond—C = 50 MB—the optimal UAV trajectory with C = 50 MB star—IoTDs—the location of IoTDSBack to article page