Method and apparatus for transmitting and receiving channel state information

A communication method of a base station in a mobile communication system, comprising:

• transmitting a control signal to a user equipment, the control signal comprising at least one of:
• a first information element or a second information element;
• and
• receiving a report for channel state information (CSI) from the user equipment,
• wherein if a field of the first information element is set to a predetermined value and a CSI reporting mode determined based on the second information element is a predetermined mode, a codebook is determined based on the CSI reporting mode,
• wherein the report for CSI is generated based on the determined codebook, the CSI comprising at least one of a rank indicator (RI), a first precoding matrix indicator (PMI), or a second PMI.

A communication apparatus of a user equipment, the apparatus comprising:

• a transceiver to communicate with a base station;
• and
• a controller to control:
• receiving a control signal from abase station, the control signal comprising at least one of:
• a first information element or a second information element;
• determining, if a field of the first information element is set to a predetermined value and a channel state information (CSI) reporting mode determined based on the second information element is a predetermined mode, a codebook based on the CSI reporting mode;
• generating a CSI based on the determined codebook, the CSI comprising at least one of a rank indicator (RI), a first precoding matrix indicator (PMI), or a second PMI;
• and
• reporting the generated CSI to the base station.

A communication apparatus of a base station, the apparatus comprising:

• a transceiver to communicate with a user equipment;
• and
• a controller to control transmitting a control signal to a user equipment, the control signal comprising at least one of:
• a first information element or a second information element;
• and
• receiving a report for channel state information (CSI) from the user equipment,
• wherein if a field of the first information element is set to a predetermined value and a CSI reporting mode determined based on the second information element is a predetermined mode, a codebook is determined based on the CSI reporting mode,
• wherein the report for CSI is generated based on the determined codebook, the CSI comprising at least one of a rank indicator (RI), a first precoding matrix indicator (PMI) or a second PMI.