Method for aperiodic feedback of channel state information in a wireless access system supporting multi-carrier aggregation

A method for receiving an aperiodic feedback in a wireless access system supporting multicarrier aggregation, the method comprising:

• transmitting, by an evolved Node-B (eNB) to a user equipment (UE), a radio resource control RRC signal including information indicating two or more downlink component carriers (DL CCs);
• transmitting, by the eNB to the UE, an uplink grant including a carrier indicator field and a request field, the request field indicating that an aperiodic feedback is triggered for the two or more DL CCs;
• and
• receiving, by the eNB from the UE, a physical uplink shared channel (PUSCH) via an uplink CC indicated by the carrier indicator field, the PUSCH including the aperiodic feedback for the two or more DL CCs indicated by the information.

An apparatus for transmitting aperiodic feedback in a wireless access system supporting multicarrier aggregation, the apparatus comprising:

• a transmitter;
• a receiver;
• and
• a processor that controls the receiver to:
• receive, from an eNB, a radio resource control (RRC) signal including information indicating two or more downlink component carriers (DL CCs);
• and
• receive, from the eNB, un uplink grant including a carrier indicator field and a request field, the request field indicating that an aperiodic feedback is triggered for the two or more DL CCs;
• and
• the transmitter to transmit, to the eNB, a physical uplink shared channel (PUSCH) via an uplink CC indicated by the carrier indicator field, the PUSCH including the aperiodic feedback for the two or more DL CCs indicated by the information.

An apparatus for receiving an aperiodic feedback in a wireless access system supporting multicarrier aggregation, the apparatus comprising:

• a transmitter;
• a receiver;
• and
• a processor that controls the transmitter to:
• transmit, to a UE, a radio resource control (RRC) signal including information indicating two or more downlink component carriers (DL CCs);
• and
• transmit, to the UE, an uplink grant including a carrier indicator field and a request field, the request field indicating that an aperiodic feedback is triggered for the two or more DL CCs, and
• the receiver to receive, from the UE, a physical uplink shared channel (PUSCH) via an uplink CC indicated by the carrier indicator field, the PUSCH including the aperiodic CSI feedback for the two or more DL CCs indicated by the information.