Patent ID: 9565008
Date: 2017-02-07
CPC Classifications: H04B,H04L,H04W

Claim:
1. A method for transmitting channel state information for a downlink transmission through an uplink by a user equipment (UE) in a wireless communication system supporting multiple antennas, the method comprising: transmitting, by the UE to an eNB, a rank indicator (RI) and a precoder type indicator (PTI) having a first value of “0” in at least one first subframe, a wideband (WB) first precoding matrix index (PMI) in at least one second subframe, and a WB second PMI and a WB channel quality indicator (CQI) in at least one third subframe; and transmitting, by the UE to the eNB, the RI and the PTI having a second value of “1” in at least one fourth subframe, a WB second PMI and a WB CQI in at least one fifth subframe, and a subband (SB) second PMI and an SB CQI in at least one sixth subframe, wherein the at least one first subframe and the at least one fourth subframe satisfy a same condition configured based on a first reporting period, wherein the at least one second subframe satisfies a condition configured based on a second reporting period, wherein the at least one fifth subframe satisfies a condition configured based on a third reporting period, wherein the WB first PMI indicates precoding matrix candidates applied to the downlink transmission and the WB second PMI indicates one of the precoding matrix candidates, wherein transmission timing of the RI and PTI is configured as an offset value relative to transmission timing of the WB second PMI and WB CQI.