The present disclosure relates to a 5th generation (5G) or pre-5G communication
system for supporting a higher
data transmission rate than a 4th generation (4G) communication
system such as long-term evolution (LTE). Disclosed is a method performed by a terminal that may comprise: receiving configuration information for a CSI report from a
base station; acquiring a channel quality indicator (CQI) table on the basis of the configuration information for the CSI report; and transmitting CSI including a CQI according to the CQI table to the
base station, wherein the CQI table is configured on the basis of a first CQI table of a case where transport
block error probability is 0.1 and a second CQI table for a case where transport
block error probability is 0.00001. The method performed by the terminal may further comprise: receiving configuration information relating to a physical uplink shared channel (PUSCH) or a physical downlink shared channel (PDSCH) from the
base station; identifying a modulation and coding scheme (MCS) table on the basis of the configuration information relating to the PUSCH or PDSCH; and acquiring a transport
block size (TBS) on the basis of the MCS table, wherein the MCS table is configured on the basis of a first MCS table configured by default and a second MCS table configured for low
spectral efficiency (SE) in the base
station.