Method of transmitting or receiving uplink control information in wireless communication system and apparatus for the same

1. A method of transmitting uplink control information by a user equipment (UE) in which a plurality of cells are configured, the method comprising:

receiving, by the UE, downlink data through at least one cell of the plurality of cells;

selecting, by the UE, one cell-group from a plurality of cell-groups, such that the at least one cell, through which the downlink data is received, is entirely included in the selected cell-group;

determining, by the UE, a payload length of hybrid automatic repeat and request (HARQ)-acknowledgement (ACK) information in accordance with the selection of the cell-group;

attaching, by the UE, a cyclic redundancy check (CRC) indicating the selected cell-group to the HARQ-ACK information when the payload length of the HARQ-ACK information is longer than 22-bits; and

transmitting the HARQ-ACK information by piggybacking the HARQ-ACK information to a physical uplink shared channel (PUSCH),

wherein a cell-group indexed as “i” is completely included in a cell-group indexed as “(i+1)”, where “i” is positive integer smaller than a total number of the plurality of cell-groups, and

wherein, when the at least one cell through which the downlink data is received belongs to two or more cell-groups among the plurality of cell groups, the UE selects a lowest indexed cell-group having a smallest number of cells among the two or more cell-groups.

2. The method according to claim 1 , wherein different cell-groups having a same number of cells among the plurality of cell-groups are distinguished from each other by applying a cell-group specific CRC mask to the CRC of the HARQ-ACK information.

3. The method according to claim 1 , wherein the one cell-group is selected based on a downlink assignment index (DAI) included in downlink control information for scheduling the downlink data.

4. The method according to claim 3 , wherein the one cell-group is a cell-group having a smallest number of cells among cell-groups having at least “N” cells, where “N” is a number indicated by a value of the DAI.

5. The method according to claim 1 , wherein a channel coding scheme is determined based on a sum of the payload length of the HARQ-ACK information and a length of the CRC.

6. A user equipment (UE) in which a plurality of cells are configured, comprising:

a receiver configured to receive downlink data through at least one cell of the plurality of cells;

a processor operatively connected to the receiver, the processor being configured to:

select one cell-group from a plurality of cell-groups, such that the at least one cell through which the downlink data is received is entirely included in the selected cell-group,

determine a payload length of hybrid automatic repeat and request (HARQ)-acknowledgement (ACK) information in accordance with the selection of the cell-group, and

attach a cyclic redundancy check (CRC) indicating the selected cell-group to the HARQ-ACK information when the payload length of the HARQ-ACK information is longer than 22-bits; and

a transmitter operatively connected to the processor, the transmitter being configured to transmit the HARQ-ACK information by piggybacking the HARQ-ACK information to a physical uplink shared channel (PUSCH),

wherein a cell-group indexed as “i” is completely included in a cell-group indexed as “(i+1)”, where “i” is positive integer smaller than a total number of the plurality of cell-groups, and

wherein, when the at least one cell through which the downlink data is received belongs to two or more cell-groups among the plurality of cell groups, the UE selects a lowest indexed cell-group having a smallest number of cells among the two or more cell-groups.