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.