TERMINAL DEVICE, METHOD IMPLEMENTED BY THE TERMINAL DEVICE, BASE STATION AND METHOD IMPLEMENTED BY THE BASE STATION IN A WIRELESS COMMUNICATION SYSTEM

Abstract

The invention relates to a terminal device, a method performed by a terminal device, a base station, and a method performed by a base station in a wireless communication system. The method performed by a terminal device comprises the following steps: receiving, from the base station, configuration information reporting channel state information (CS1), configuration information reporting CS1 comprising first information indicating at least one CSI parameter configured with wideband reporting or subband reporting and second information indicating the set of subbands to which CS1 is reported, wherein the case where wideband reporting is configured, at least one CSI parameter is reported for the entire set of subbands and in the case where subband reporting is configured, at least one CS1 parameter is reported for each subband of the set of subbands; Identify the first CSI part and the second CS1 part for the set of subbands based on the first and second pieces of information;and transmits, to the base station, the CS1 report comprising the first and second CSI portions, where the first CSI portion includes channel quality information (CQI) and information on the number of non-zero coefficients, where the second CSI portion includes the precoding matrix indicator (PMI), where the payload size of the second CSI portion is linked to the first CSI portion, and where the first and second CSI portions are encoded separately.