A method of transmitting uplink control information, UCI, in a wireless access system supporting carrier aggregation, CA, the method performed by a user equipment, UE, comprising: performing channel coding with respect to the UCI according to a payload size of the UCI including channel quality information, CQI; performing rate matching with respect to the channel coded UCI for a physical uplink control channel, PUCCH, format 3 resource in a Long-Term Evolution, LTE, wireless system; characterized in that, when the payload size of the UCI is equal to or less than 11 bits, the channel coding is performed by using a (32, 0) RM code, and the rate matching with 48 bits with respect to the channel coded UCI for the PUCCH format 3 is performed, and the rate matched UCI is transmitted based on the PUCCH format 3, when the payload size of the UCI is greater than 11 bits, the channel coding is performed by using two (32, O) RM codes, wherein even bits of the UCI o 0,o 1,o 2,..., o 2x┌O/2┐-1) or, alternatively, bits o 0,o 1,..., o of the UCI are allocated to a first (32, O) RM code of the two RM codes and are encoded and rate matched such that first output bits represented as b 1 0, b 1 1, b 1 2,..., b 1 23 are obtained and wherein odd bits of the UCI o 1,o 3,o 5,..,ο 2x(└O/2┘-1)+1 or, alternatively, bits o ┌O/2┐, o ┌O/2┐ +1,...,o O-1 of the UCI are all to a second (32, O) RM code of the two RM codes and are encoded and rate matched such that second output bits represented as b 2 0, b 2 1, b 2 2,..., b 2 23 are obtained and interleaving is performed during combining the first output bits and the second output bits, wherein the combined bits are represented as b 0 1, b 0 2, b 1 1, b 1 2, b 2 1, b 2 2, ⋯, b 23 1, b 23 2, and the combined bits are transmitted based on the PUCCH format 3, and 'O' is the payload size of the UCI. performing channel coding with respect to the UCI according to a payload size of the UCI including channel quality information, CQI; performing rate matching with respect to the channel coded UCI for a physical uplink control channel, PUCCH, format 3 resource in a Long-Term Evolution, LTE, wireless system; characterized in that, when the payload size of the UCI is equal to or less than 11 bits, the channel coding is performed by using a (32, 0) RM code, and the rate matching with 48 bits with respect to the channel coded UCI for the PUCCH format 3 is performed, and the rate matched UCI is transmitted based on the PUCCH format 3, when the payload size of the UCI is greater than 11 bits, the channel coding is performed by using two (32, O) RM codes, wherein even bits of the UCI o 0,o 1,o 2,..., o 2x┌O/2┐-1) or, alternatively, bits o 0,o 1,..., o of the UCI are allocated to a first (32, O) RM code of the two RM codes and are encoded and rate matched such that first output bits represented as b 1 0, b 1 1, b 1 2,..., b 1 23 are obtained and wherein odd bits of the UCI o 1,o 3,o 5,..,ο 2x(└O/2┘-1)+1 or, alternatively, bits o ┌O/2┐, o ┌O/2┐ +1,...,o O-1 of the UCI are all to a second (32, O) RM code of the two RM codes and are encoded and rate matched such that second output bits represented as b 2 0, b 2 1, b 2 2,..., b 2 23 are obtained and interleaving is performed during combining the first output bits and the second output bits, wherein the combined bits are represented as b 0 1, b 0 2, b 1 1, b 1 2, b 2 1, b 2 2, ⋯, b 23 1, b 23 2, and the combined bits are transmitted based on the PUCCH format 3, and 'O' is the payload size of the UCI.