Feedback method and apparatus for use in mobile communication system

A method for receiving channel state information (CSI) by a base station, the method comprising:

• transmitting, to a user equipment (UE), feedback configuration information including information on a plurality of channel state information reference signals (CSI-RSs) for channel measurement;
• transmitting, to the UE, a first CSI-RS and a second CSI-RS;
• and
• receiving, from the UE, a channel quality indicator (CQI) for N antenna ports, the CQI being generated based on the information on the plurality of CSI-RSs,
• wherein N is a natural number, and
• wherein the N antenna ports are determined based on the information on the plurality of CSI-RSs, and a number of the N antenna ports is a sum of a first number of antenna ports for the first CSI-RS and a second number of antenna ports for the second CSI-RS.

A user equipment (UE) for transmitting channel state information (CSI), the UE comprising:

• a transceiver;
• and
• a controller, which is coupled to the transceiver, configured to control to:
• receive, from a base station, feedback configuration information including information on a plurality of channel state information reference signals (CSI-RSs) for channel measurement,
• receive, from the base station, a first CSI-RS and a second CSI-RS,
• generate a channel quality indicator (CQI) for N antenna ports based on the information on the plurality of CSI-RSs,
• wherein the N antenna ports are determined based on the information on the plurality of CSI-RSs, and transmit, to the base station, the CQI for the N antenna ports, and a number of the N antenna ports is a sum of a first number of antenna ports for the first CSI-RS and a second number of antenna ports for the second CSI-RS, and
• wherein N is a natural number.

A base station for receiving channel state information (CSI), the base station comprising:

• a transceiver;
• and
• a controller, which is coupled to the transceiver, configured to control to:
• transmit, to a user equipment (UE), feedback configuration information including information on a plurality of channel state information reference signals (CSI-RSs) for channel measurement,
• transmit, to the UE, a first CSI-RS and a second CSI-RS, and
• receive, from the UE, a channel quality indicator (CQI) for N antenna ports, the CQI being generated based on the information on the plurality of CSI-RSs,
• wherein N is a natural number, and
• wherein the N antenna ports are determined based on the information on the plurality of CSI-RSs, and a number of the N antenna ports is a sum of a first number of antenna ports for the first CSI-RS and a second number of antenna ports for the second CSI-RS.