Channel state information feedback method and apparatus

A method for transmitting channel state information, the method comprising:

• receiving, from an evolved node B (eNB), a signaling message comprising information indicating whether a user equipment (UE) is configured without a precoding matrix indicator (PMI) reporting or not;
• receiving, from the eNB, a channel status information-reference signal (CSI-RS) for the UE;
• and
• transmitting, to the eNB, channel state information comprising a channel quality indicator (CQI) that is calculated based on a codebook which is provided to the UE through a higher-layer signaling, if the information indicates that the UE is configured without the PMI reporting,
• wherein the codebook is based on a number of layers and a number of ports used for CSI reporting.

An apparatus in an evolved node B (eNB) for receiving channel state information, the apparatus comprising:

• a controller configured to:
• transmit, to a user equipment (UE), a signaling message comprising information indicating whether the UE is configured without a precoding matrix indicator (PMI) reporting or not,
• transmit, to the UE, a channel status information-reference signal (CSI-RS) for the UE, and
• receive channel state information comprising a channel quality indicator (CQI) that is calculated based on a codebook which is provided to the UE through a higher-layer signaling, if the information indicates that the UE is configured without the PMI reporting, wherein the codebook is based on a number of layers and a number of ports used for CSI reporting;
• and
• a transceiver configured to receive, from the UE, the channel state information under control of the controller.

An apparatus in a user equipment (UE) for transmitting channel state information, the apparatus comprising:

• a controller configured to:
• receive, from an evolved node B (eNB), a signaling message comprising information indicating whether the UE is configured without a precoding matrix indicator (PMI) reporting or not,
• receive, from the eNB, a channel status information-reference signal (CSI-RS) for the UE, and
• transmit, to the eNB, channel state information comprising a channel quality indicator (CQI) that is calculated based on a codebook which is provided to the UE through a higher-layer signaling, if the information indicates that the UE is configured without the PMI reporting, wherein the codebook is based on a number of layers and a number of ports used for CSI reporting;
• and
• a transceiver configured to:
• transmit, to the eNB, the channel state information under control of the controller.