Method and device for uplink communication in non-terrestrial network

A method of operating a terminal, the method comprising:

• transmitting, by a processor of the terminal, to a base station and through a satellite, information indicating a maximum transmit power of the terminal;
• receiving, by the processor, from the base station and through the satellite, scheduling information generated based on communication qualities predicted considering a first length of a feeder link between the base station and the satellite connected to the base station, a second length of a service link between the satellite and the terminal connected to the satellite, and the maximum transmit power;
• and
• performing, by the processor, uplink communication with the base station based on the scheduling information.

A base station comprising a processor, wherein the processor causes the base station to perform:

• predicting, by the processor, a first length of a feeder link between the base station and a satellite connected to the base station;
• predicting, by the processor, a second length of a service link between the satellite and a terminal connected to the satellite;
• predicting, by the processor, a first communication quality for the feeder link considering the first length;
• predicting, by the processor, a second communication quality for the service link considering the second length;
• generating, by the processor, scheduling information based on the first communication quality and the second communication quality;
• transmitting, by the processor, the scheduling information to the terminal through the satellite;
• and
• performing, by the processor, uplink communication with the terminal based on the scheduling information.