Method and apparatus for transmitting channel state information

A user equipment (UE), comprising:

• a radio frequency (RF) unit configured to transmit and receive radio signals;
• and
• a processor connected to the RF unit,
• wherein the processor is configured to transmit first channel information indicating a set of preceding matrices to a base station (BS) periodically,
• transmit second channel information indicating one precoding matrix included in the set of precoding matrices to the BS periodically,
• wherein second channel information transmitted in a specific subframe is determined based on first channel information that has most recently been transmitted before the specific subframe, and
• wherein a channel quality indicator (CQI) transmitted in the specific subframe is calculated based on one precoding matrix specified by the first channel information that has most recently been transmitted before the specific subframe and by the second channel information determined based on the first channel information that has most recently been transmitted before the specific subframe.