A method for a communication apparatus to transmit control information using an Acknowledgement/Negative Acknowledgement, AN, channel selection scheme, the method comprising: transmitting a complex value via a Physical Uplink Control Channel, PUCCH, resource based on an identified AN state set and a mapping rule of Table 1 below, wherein the identified AN state set is for a plurality of cells including a primary cell, PCell, and one or more secondary cell, Scell, the identified AN state set including Hybrid Automatic Repeat reQuest Acknowledgement, HARQ-ACK,, HARQ-ACK for a Primary Cell, PCell, and HARQ-ACK, HARQ-ACK for a Secondary Cell, SCell, Table 1 PCell SCell PUCCH resource Complex value PCell SCell #1 SCell #2 PCell HARQ-ACK SCell #1 HARQ-ACK SCell #2 HARQ-ACK SCell #3 HARQ-ACK ACK ACK ACK ACK 2 nd PUCCH resource -1 ACK NACK/DTX ACK ACK 3 rd PUCCH resource -j NACK/DTX ACK ACK ACK 2 nd PUCCH resource -j NACK/DTX NACK/DTX ACK ACK 4 th PUCCH resource -1 ACK ACK ACK NACK/DTX 2 nd PUCCH resource j ACK NACK/DTX ACK NACK/DTX 3 rd PUCCH resource 1 NACK/DTX ACK ACK NACK/DTX 2 nd PUCCH resource 1 NACK/DTX NACK/DTX ACK NACK/DTX 4 th PUCCH resource j ACK ACK NACK/DTX ACK 3 rd PUCCH resource -1 ACK NACK/DTX NACK/DTX ACK 3 rd PUCCH resource j NACK/DTX ACK NACK/DTX ACK 4 th PUCCH resource -j NACK/DTX NACK/DTX NACK/DTX ACK 4 th PUCCH resource 1 ACK ACK NACK/DTX NACK/DTX 1 st PUCCH resource -1 ACK NACK/DTX NACK/DTX NACK/DTX 1 st PUCCH resource j NACK/DTX ACK NACK/DTX NACK/DTX 1 st PUCCH resource -j NACK DTX NACK/DTX NACK/DTX 1 st PUCCH resource 1 DTX NACK NACK/DTX NACK/DTX 1 st PUCCH resource 1 NACK NACK NACK/DTX NACK/DTX 1 st PUCCH resource 1 DTX DTX NACK/DTX NACK/DTX No transmission wherein HARQ-ACK and denote ACK/NACK/DTX responses to transport blocks of the PCell, and HARQ-ACK and denote ACK/NACK/DTX responses to transport blocks of the SCell, and wherein "ACK" represents a positive acknowledgement, "NACK" represents a negative acknowledgement, "DTX" represents a discontinuous transmission, and "NACK/DTX" represents "NACK" or "DTX". transmitting a complex value via a Physical Uplink Control Channel, PUCCH, resource based on an identified AN state set and a mapping rule of Table 1 below, wherein the identified AN state set is for a plurality of cells including a primary cell, PCell, and one or more secondary cell, Scell, the identified AN state set including Hybrid Automatic Repeat reQuest Acknowledgement, HARQ-ACK,, HARQ-ACK for a Primary Cell, PCell, and HARQ-ACK, HARQ-ACK for a Secondary Cell, SCell, Table 1 PCell SCell PUCCH resource Complex value PCell SCell #1 SCell #2 PCell HARQ-ACK SCell #1 HARQ-ACK SCell #2 HARQ-ACK SCell #3 HARQ-ACK ACK ACK ACK ACK 2 nd PUCCH resource -1 ACK NACK/DTX ACK ACK 3 rd PUCCH resource -j NACK/DTX ACK ACK ACK 2 nd PUCCH resource -j NACK/DTX NACK/DTX ACK ACK 4 th PUCCH resource -1 ACK ACK ACK NACK/DTX 2 nd PUCCH resource j ACK NACK/DTX ACK NACK/DTX 3 rd PUCCH resource 1 NACK/DTX ACK ACK NACK/DTX 2 nd PUCCH resource 1 NACK/DTX NACK/DTX ACK NACK/DTX 4 th PUCCH resource j ACK ACK NACK/DTX ACK 3 rd PUCCH resource -1 ACK NACK/DTX NACK/DTX ACK 3 rd PUCCH resource j NACK/DTX ACK NACK/DTX ACK 4 th PUCCH resource -j NACK/DTX NACK/DTX NACK/DTX ACK 4 th PUCCH resource 1 ACK ACK NACK/DTX NACK/DTX 1 st PUCCH resource -1 ACK NACK/DTX NACK/DTX NACK/DTX 1 st PUCCH resource j NACK/DTX ACK NACK/DTX NACK/DTX 1 st PUCCH resource -j NACK DTX NACK/DTX NACK/DTX 1 st PUCCH resource 1 DTX NACK NACK/DTX NACK/DTX 1 st PUCCH resource 1 NACK NACK NACK/DTX NACK/DTX 1 st PUCCH resource 1 DTX DTX NACK/DTX NACK/DTX No transmission wherein HARQ-ACK and denote ACK/NACK/DTX responses to transport blocks of the PCell, and HARQ-ACK and denote ACK/NACK/DTX responses to transport blocks of the SCell, and wherein "ACK" represents a positive acknowledgement, "NACK" represents a negative acknowledgement, "DTX" represents a discontinuous transmission, and "NACK/DTX" represents "NACK" or "DTX".