Method and apparatus for transmitting channel status information efficiently in a multi-carrier wireless communication system

A method of receiving channel status information in a multi-carrier wireless communication system, the method comprising:

• transmitting a signal on N (N≧2) carriers from a transmitter to a receiver;
• and
• receiving, on M (1≦M≦N) carriers from the receiver to the transmitter, channel status information of the N carriers,
• wherein the channel status information of the N carriers is determined based on the signal transmitted on the N carriers at the receiver, and
• wherein the channel status information of the N carriers are received according to respective channel status information reporting periods and channel status information reporting period offsets of the N carriers.

A user equipment for transmitting channel status information in a multi-carrier wireless communication system, the user equipment comprising:

• a reception module configured to receive a downlink signal from a base station;
• a transmission module configured to transmit an uplink signal to the base station;
• and
• a processor configured to control the user equipment including the reception module and the transmission module,
• wherein the processor receives a downlink signal transmitted on N (N≧2) downlink carriers from the base station through the reception module, determines channel status information of the N downlink carriers based on the received downlink signal, and transmits, on M (1≦M≦N) uplink carriers, the channel status information of the N downlink carriers through the transmission module, and
• wherein the channel status information of the N downlink carriers is transmitted according to respective channel status information reporting periods and channel status information reporting period offsets of the N downlink carriers.

A base station for receiving channel status information in a multi-carrier wireless communication system, the base station comprising:

• a reception module configured to receive an uplink signal from a user equipment;
• a transmission module configured to transmit a downlink signal to the user equipment;
• and
• a processor configured to control the base station including the reception module and the transmission module,
• wherein the processor transmits a downlink signal on N (N≧2) downlink carriers to the user equipment through the transmission module, receives, on M (1≦M≦N) uplink carriers from the user equipment, channel status information of the N downlink carriers through the reception module,
• wherein the channel status information of the N downlink carriers is determined based on the signal transmitted on the N downlink carriers at the user equipment, and wherein the channel status information of the N downlink carriers are received according to respective channel status information reporting periods and channel status information reporting period offsets of the N downlink carriers.