Method and device for RIS automatic setup

A method by a reconfigurable intelligent surface (RIS) in a wireless communication system, the method comprising:

• receiving a request for channel estimation from an RIS controller (RC);
• identifying incident beams incident from a base station to the RIS;
• transmitting channel information about an incident beam having a largest reception strength among the incident beams to the RC;
• receiving information about an optimal RIS mode derived by a user equipment (UE) through the RC;
• and
• setting the RIS as the optimal RIS mode.

A user equipment (UE) in a wireless communication system, the UE comprising:

• a transceiver;
• and
• at least one processor configured to:
• receive reconfigurable intelligent surface (RIS) information from an RIS controller (RC) through the transceiver,
• identify an incident beam incident on the UE,
• provide information about the identified incident beam to the RC through the transceiver and request information about candidate RIS modes,
• receive the information about the candidate RIS modes through the transceiver,
• perform probing on the candidate RIS modes,
• derive a final RIS mode among the candidate RIS modes using a result of the probing, and
• transmit, through the transceiver, information about the final RIS mode to an RIS through the RC.

A reconfigurable intelligent surface (RIS) in a wireless communication system, the RIS comprising:

• a transceiver;
• and
• at least one processor configured to:
• receive a request for channel estimation from an RIS controller (RC) through the transceiver,
• identify incident beams incident from a base station to the RIS,
• transmit, through the transceiver, channel information about an incident beam having a largest reception strength among the incident beams to the RC,
• receive, through the transceiver, information about a final RIS mode derived by a user equipment (UE) through the RC, and
• set the RIS as the final RIS mode.