Apparatus and method for transmitting channel state information in a wireless communication system

A user equipment (UE) for transmitting channel state information in a wireless communication system, the UE comprising:

• a downlink reception unit which receives, from a base station, information indicating a linkage between a cell set including a serving cell and a subset including a subframe, and channel-state-information-request information indicating the cell set;
• a channel state information configuration unit which measures a channel state for the subframe on the serving cell, and configures channel state information indicating the measured channel state;
• and
• an uplink transmission unit which transmits the channel state information to the base station.

A method for receiving channel state information by a base station in a wireless communication system, the method comprising the steps of:

• transmitting, to a user equipment (UE), information indicating a linkage between a cell set including a serving cell and a subset including a subframe;
• transmitting, to the UE, channel-state-information-request information indicating the cell set;
• and
• receiving the channel state information from the UE.

A base station for receiving channel state information in a wireless communication system, the base station comprising:

• a downlink transmission unit which transmits, to a user equipment (UE), information indicating a linkage between a cell set including a serving cell and a subset including a subframe, and channel-state-information-request information indicating the cell set;
• a channel-state-information-request generation unit which generates the channel-state-information-request information to be transmitted on a physical downlink control channel (PDCCH);
• and
• an uplink reception unit which receives the channel state information from the UE.

A method for periodically transmitting channel state information by a user equipment (UE) in a wireless communication system, the method comprising the steps of:

• determining whether there exists at least one of a change in the report period of channel state information, a subset change, and an almost blank subframe (ABS) pattern change;
• measuring a channel state for the changed subset if a subset change exists;
• and
• transmitting, to a base station, channel state information indicating the measured channel state, based on the changed report period of channel state information if there exists a change in the report period of channel state information,
• wherein the subset comprises at least one subframe for which the channel state information is to be reported.