Patent ID: 8837568

Claim:
A method of transmitting feedback information in a wireless communication system, the method comprising: dividing, by a user equipment (UE), a whole frequency band of a downlink channel into a plurality of subbands; determining, by the UE, a channel quality indicator (CQI) frequency band, a precoding matrix indicator (PMI) frequency band, and a RANK frequency band, the CQI frequency band including M subbands among the plurality of subbands, the PMI frequency band including N subbands, the RANK frequency band including K subbands among the plurality of subbands, M, N, and K being positive integers, N being larger than M, and K being larger than N, wherein N is a multiple integer number of M, and K is a multiple integer number of N; calculating, by the UE, a CQI for the CQI frequency band assuming a use of the precoding matrix indicated by the PMI on the PMI frequency band of the whole frequency band, wherein the CQI has a value reflecting transmission over the CQI frequency band; allocating, by the UE, a CQI allocation unit for transmitting the CQI for the CQI frequency band; allocating, by the UE, a PMI allocation unit for transmitting the PMI for the PMI frequency band; allocating, by the UE, a RANK allocation unit for transmitting the RANK for the RANK frequency band; transmitting, by the UE, the CQI for the CQI frequency band via the CQI allocation unit; transmitting, by the UE, the PMI for the PMI frequency band via the PMI allocation unit; and transmitting, by the UE, the RANK for the RANK frequency band via the RANK allocation unit, wherein a CQI transmission interval is shorter than a PMI transmission interval, and the PMI transmission interval is shorter than a RANK transmission interval.