Method and apparatus for beam management in communication system having extra-large scale multiple input and multiple output

A method of a base station, comprising:

• receiving, through beam sweeping over an entire antenna array of an extra-large scale multiple input multiple output (XL-MIMO) antenna, a first signal including a reference signal (RS) from a terminal;
• measuring a first reference signals received power (RSRP) of the first signal to acquire information on scatterer(s);
• transmitting the information on the scatterer(s) to the terminal;
• determining a number of estimation stages for XL-MIMO antenna estimation;
• transmitting information on the determined number of estimation stages to the terminal;
• performing a first procedure of hierarchically estimating visibility regions (VRs) of the XL-MIMO antenna by the number of estimation stages for each scatterer of the scatterer(s);
• and
• performing a second procedure of determining base station beams to be used with the terminal in one or more VRs,
• wherein the information on the scatterer(s) includes a scatterer identifier and a terminal beam index corresponding to each scatterer.

A terminal comprising at least one processor,

• wherein the at least one processor is configured to:
• transmit, to a base station, a first signal including a terminal beam index for each beam and a first reference signal (RS) by performing beam sweeping of terminal beams;
• receive, from the base station, information on scatterer(s) existing on a communication path between the terminal and the base station;
• receive, from the base station, information on a number of estimation stages for antenna estimation;
• perform, with the base station, a first procedure of hierarchically estimating visibility regions (VRs) of antennas of the base station by the number of estimation stages for each scatterer of the scatterer(s);
• and
• perform, with the base station, a second procedure of determining base station beams to be used in each of the VRs,
• wherein the information on the scatterer(s) includes a scatterer identifier and a terminal beam index corresponding to each scatterer.