Method and device for time and phase synchronization between base stations in network cooperative communication

A method performed by a base station of a wireless communication system, the method comprising:

• transmitting a first reference signal from a first transmission and reception point (TRP) and a second reference signal from a second TRP to a terminal;
• transmitting, to the terminal, terminal report configuration information indicating reporting of a time delay difference between the first reference signal and the second reference signal;
• based on the terminal report configuration information, receiving information on the time delay difference between the first reference signal and the second reference signal from the terminal;
• based on the information on the time delay difference, compensating at least one reference signal of the first reference signal of the first TRP or the reference signal of the second TRP;
• transmitting compensated reference signals from the first TRP and the second TRP to the terminal;
• and
• based on the compensated reference signals, transmitting downlink information to the terminal from the first TRP and the second TRP.

A terminal of a wireless communication system, the terminal comprising:

• a transceiver;
• and
• a controller,
• wherein the controller is configured to:
• measure a first reference signal transmitted from a first transmission and reception point (TRP) of a base station a second reference signal transmitted from a second TRP;
• calculate a time delay difference between the first reference signal and the second reference signal;
• receive, from the base station, terminal report configuration information indicating reporting of the time delay difference between the first reference signal and the second reference signal;
• based on the terminal report configuration information, transmit information on the time delay difference between the first reference signal and the second reference signal to the base station;
• receive reference signals compensated based on the information on the time delay difference between the first reference signal and the second reference signal from the first TRP and the second TRP;
• and
• based on the compensated reference signals, receive downlink information from the first TRP and the second TRP.

A base station of a wireless communication system, the base station comprising:

• a transceiver;
• and
• a controller,
• wherein the controller is configured to:
• transmit, to a terminal, a first reference signal from a first transmission and reception point (TRP) and a second reference signal from a second TRP;
• transmit, to the terminal, terminal report configuration information indicating reporting of a time delay difference between the first reference signal and the second reference signal;
• based on the terminal report configuration information, receive information on the time delay difference between the first reference signal and the second reference signal from the terminal;
• based on the information on the time delay difference, compensate at least one reference signal of the first reference signal of the first TRP or the reference signal of the second TRP;
• transmit compensated reference signals from the first TRP and the second TRP to the terminal;
• and
• based on the compensated reference signals, transmit downlink information to the terminal from the first TRP and the second TRP.