Abstract: The disclosure relates to a method and device for a channel state information (CSI) report including beam information in a wireless communication system supporting an RIS. A method performed by a BS in a wireless communication system supporting an RIS includes configuring a CSI-RS group based on at least one of an RIS reflection pattern to be applied to an RIS device or a transmission beam of the BS, transmitting, to a UE, configuration information for a CSI report related to a transmission beam for the BS to transmit a CSI-RS to the UE based on the configured CSI-RS group, and receiving a CSI report related to the transmission beam from the UE receiving the CSI-RS for each CSI-RS group.

Abstract: The present disclosure relates to a method and device for communication by a base station in a wireless communication system supporting multiple reconfigurable intelligent surface (RIS) devices. According to an embodiment A method for operating a base station, the method comprises selecting at least two reference reconfigurable intelligent surface (RIS) devices for estimating a position of a user equipment (UE) from among a plurality of RIS devices, estimating position information about the UE using the selected at least two reference RIS devices, receiving an uplink pilot signal of the UE through the selected at least two reference RIS devices; and estimating a multi-RIS channel for the plurality of RIS devices based on the uplink pilot signal of the UE and the estimated position information about the UE.

Abstract: The present disclosure relates to a 5G communication system or a 6G communication system for supporting higher data rates beyond a 4G communication system such as LTE. The disclosure provides a method performed by a UE. The method includes receiving mapping information between a combination of a reflection pattern and a transmission beam of a BS and an RS from the BS; receiving scheduling information including information on a channel state corresponding to the combination of the reflection pattern and the transmission beam of the BS; identifying a reception beam based on at least one RS received from the BS, the mapping information, and the scheduling information; and receiving a downlink signal from the BS through the reception beam. The reflection pattern is related to an RIS.

Abstract: The disclosure relates to a fifth generation (5G) or sixth generation (6G) communication system for supporting a higher data transmission rate. An electronic device is provided. The electronic device includes a reconfigurable intelligent surface (RIS) including multiple reflection elements, and a communication node electrically connected to the RIS, wherein the communication node includes a transceiver and at least one processor configured to control the multiple reflection elements. The communication node is configured to receive a time estimation value (TES) associated with a propagation delay and a control signal from a base station of a first network, perform, based on the time estimation value and the control signal, early switching into an uplink reflection pattern at a second time point earlier than a preconfigured first time point, so as to reflect a signal, which is transmitted from a terminal.