Fig. 5

a Time scheduling under different C. b Minimum residual energy of NOMA and OMA under different bandwidth W. Red line with circle in a—C = 20 Mb—the time scheduling—under C = 20 MB; blue line with triangle in a—C = 60 Mb—the time scheduling—under C = 60 MB; blue line with circle in b—OMA (W = 15 MHz)—the OMA scheduling—under W = 15 MHz; red line with circle in b—NOMA(W = 15 MHz)—the NOMA scheduling—under W = 15 MHz; blue line with triangle in b—OMA(W = 5 MHz)—the OMA scheduling—under W = 5 MHz and red line with triangle in b—NOMA(W = 5 MHz)—the NOMA scheduling—under W = 15 MHz