Channel status information feedback method and apparatus for a distributed antenna mobile communication system

A method performed by a base station in a mobile communication system, the method comprising:

• transmitting, to a terminal, first measurement configuration information;
• receiving, from the terminal, reference signal received power (RSRP) information which is obtained by first reference signals based on the first measurement configuration information, the first reference signals being associated with a cell serving the terminal;
• determining a set of second reference signals to be measured based on the RSRP information, the second reference signals being associated with the cell serving the terminal;
• transmitting, to the terminal, second measurement configuration information including the set of second reference signals;
• and
• receiving, from the terminal, channel state information (CSI) which is obtained by the second reference signals based on the second measurement configuration information.

A terminal in a mobile communication system, the terminal comprising:

• a transceiver;
• and
• a controller configured to:
• receive, from a base station via the transceiver, first measurement configuration information,
• measure first reference signals for obtaining reference signal received power (RSRP) information based on the first measurement configuration information, the first reference signals being associated with a cell serving the terminal,
• transmit, to the base station via the transceiver, the RSRP information,
• receive, from the base station via the transceiver, second measurement configuration information including a set of second reference signals to be measured, the second reference signals being associated with the cell serving the terminal and being determined based on the RSRP information,
• measure the second reference signals for obtaining channel state information (CSI) based on the second measurement configuration information, and
• transmit, to the base station via the transceiver, the CSI.

A base station in a mobile communication system, the base station comprising:

• a transceiver;
• and
• a controller configured to:
• transmit, to a terminal via the transceiver, first measurement configuration information,
• receive, from the terminal via the transceiver, reference signal received power (RSRP) information which is obtained by first reference signals based on the first measurement configuration information, the first reference signals being associated with a cell serving the terminal,
• determine a set of second reference signals to be measured based on the RSRP information, the second reference signals being associated with the cell serving the terminal,
• transmit, to the terminal via the transceiver, second measurement configuration information including the set of second reference signals, and
• receive, from the terminal via the transceiver, channel state information (CSI) which is obtained by the second reference signals based on the second measurement configuration information.