Method for a terminal to transmit channel state information to a base station in a radio communication system, and device for same

A method of transmitting a rank indicator (RI) to a serving base station at a user equipment in a wireless communication system, the method comprising:

• mapping at least one periodic RI and at least one aperiodic RI to a physical uplink shared channel (PUSCH) of a subframe, if a report on the at least one periodic RI and a report on the at least one aperiodic RI occur in a same subframe;
• and
• transmitting the at least one periodic RI and the at least one aperiodic RI to the serving base station,
• wherein the at least one periodic RI and the at least one aperiodic RI are separately time first mapped to resource elements corresponding to a pre-defined symbol of the subframe,
• wherein the at least one aperiodic RI corresponds to at least one component carrier configured in each of the serving base station and a neighboring base station for a coordinated multi point (CoMP) transmission of the serving base station and the neighboring base station,
• wherein the at least one periodic RI corresponds to at least one component carrier configured in the serving base station for a non-CoMP transmission, and
• wherein mapping the at least one periodic RI and the at least one aperiodic RI comprises performing the time first mapping of the at least one periodic RI to the resource elements corresponding to the pre-defined symbol in a descending order of a subcarrier index, after performing the time first mapping of the at least one aperiodic RI to the resource elements corresponding to the pre-defined symbol of the subframe in the descending order of the subcarrier index.