Patent ID: 8923233

Claim:
A method for transmitting channel state information for a downlink transmission through an uplink in a wireless communication system, the method comprising: transmitting a rank indicator (RI) and a precoder type indicator (PTI) according to a first reporting period; when the PTI has a value of 0, transmitting a wideband (WB) first precoding matrix index (PMI) according to a second reporting period shorter than the first reporting period and within the first reporting period, and transmitting a WB second PMI and a WB channel quality indicator (CQI) one time or more within the second reporting period; and when the PTI has a value of 1, transmitting a WB second PMI and a WB CQI according to a third reporting period shorter than the first reporting period and within the first reporting period, and transmitting a subband (SB) second PMI and an SB CQI one time or more within the third reporting period, wherein the SB CQI is transmitted one time or more for full cycles of bandwidth parts (BPs), and wherein the first PMI indicates precoding matrix candidates applied to the downlink transmission and the second PMI indicates one of the precoding matrix candidates.