Apparatus and method for transmitting and receiving signal according to channel state in wireless communication system

A method performed by a base station (BS) in a wireless communication system, the method comprising:

• transmitting, to a user equipment (UE), mapping information between identifiers (IDs) for a channel state and at least one reference signal (RS), wherein the IDs for the channel state correspond to a combination of a reflection pattern of a reconfigurable intelligent surface (RIS) and a transmission beam of the BS;
• transmitting, to the UE, scheduling information including information on a time interval in which the IDs for the channel state are applied;
• transmitting, to the UE, the at least one RS;
• and
• transmitting, to the UE, a downlink signal,
• wherein the downlink signal is associated with a reception beam for the time interval, and
• wherein the reception beam of the UE is identified based on the at least one RS, the mapping information, and the scheduling information.

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

• a transceiver;
• and
• a controller coupled with the transceiver, and configured to:
• receive, from a base station (BS), mapping information between identifiers (IDs) for a channel state and a at least one reference signal (RS), wherein the IDs for the channel state correspond to a combination of a reflection pattern of a reconfigurable intelligent surface (RIS) and a transmission beam of the BS,
• receive, from the BS, scheduling information including information on a time interval in which the IDs for the channel state are applied,
• receive, from the BS, the at least one RS,
• identify a reception beam for the time interval, based on the at least one RS, the mapping information, and the scheduling information, and
• receive, from the BS using the reception beam of the UE, a downlink signal.

A base station (BS) in a wireless communication system, the BS comprising:

• a transceiver;
• and
• a controller coupled with the transceiver, and configured to:
• transmit, to a user equipment (UE), mapping information between identifiers (IDs) for a channel state and a at least one reference signal (RS), wherein the IDs for the channel state correspond to a combination of a reflection pattern of a reconfigurable intelligent surface (RIS) and a transmission beam of the BS,
• transmit, to the UE, scheduling information including information on a time interval in which the IDs for the channel state are applied,
• transmit, to the UE, the at least one RS, and
• transmit, to the UE, a downlink signal,
• wherein the downlink signal is associated with a reception beam for the time interval, and
• wherein the reception beam of the UE is identified based on the at least one RS, the mapping information, and the scheduling information.