Method and device for transmitting data in non-terrestrial network

A base station comprising at least one processor, wherein the at least one processor causes the base station to perform:

• allocating a reference signal (RS) corresponding to each of a first satellite and a second satellite;
• controlling the first satellite and the second satellite to transmit an RS and data corresponding to each satellite to a user equipment (UE);
• receiving an RS measurement report message from the UE;
• determining a transmission mode among a single transmission mode for transmitting data via one of the first satellite and the second satellite or a diversity transmission mode for transmitting data via both the first satellite and the second satellite, based on the received RS measurement report message;
• and
• transmitting data to the UE based on the determined transmission mode,
• wherein the RS measurement report message includes a first time delay and a first Doppler shift based on a first RS received through a first link via the first satellite and a second time delay and a second Doppler shift based on a second RS received through a second link via the second satellite.