A User Equipment, UE (102, 1002, 1102, 1602), comprising: a processor; memory in electronic communication with the processor; instructions stored in the memory, the instructions being executable to: receive a UE-specific radio resource control, RRC, message from a base station (160, 1060, 1160, 1760), the RRC message including a configuration to indicate a cell as a primary secondary cell, PSCell, or a secondary primary cell, SPCell, for a second group among multiple cell groups, each of which is constituted by one or more serving cells; wherein a cell configured with a physical uplink control channel, PUCCH, which is included in a first group of the multiple cell groups is a primary cell, PCell, and a cell configured with a PUCCH, which is included in the second group of the multiple cell groups is the PSCell or the SPCell, wherein the PSCell or the SPCell is used for a random access procedure between the UE (102, 1002, 1102, 1602) and the base station (160, 1060, 1160, 1760), and wherein one or more hybrid automatic repeat request acknowledgements, HARQ-ACKs, for the first group are mapped to the PUCCH on the PCell and one or more hybrid automatic repeat request acknowledgements, HARQ-ACKs, for the second group are mapped to the PUCCH on the PSCell or the SPCell, the instructions being further executable to: decode a physical downlink control channel, PDCCH, with a cyclic redundancy check, CRC, scrambled by a random access radio network temporary identifier, RA-RNTI, in a common search space on the PCell; and decode a physical downlink control channel, PDCCH, with a cyclic redundancy check, CRC, scrambled by a random access radio network temporary identifier, RA-RNTI, in a common search space on the PSCell or the SPCell. a processor; memory in electronic communication with the processor; instructions stored in the memory, the instructions being executable to: receive a UE-specific radio resource control, RRC, message from a base station (160, 1060, 1160, 1760), the RRC message including a configuration to indicate a cell as a primary secondary cell, PSCell, or a secondary primary cell, SPCell, for a second group among multiple cell groups, each of which is constituted by one or more serving cells; wherein a cell configured with a physical uplink control channel, PUCCH, which is included in a first group of the multiple cell groups is a primary cell, PCell, and a cell configured with a PUCCH, which is included in the second group of the multiple cell groups is the PSCell or the SPCell, wherein the PSCell or the SPCell is used for a random access procedure between the UE (102, 1002, 1102, 1602) and the base station (160, 1060, 1160, 1760), and wherein one or more hybrid automatic repeat request acknowledgements, HARQ-ACKs, for the first group are mapped to the PUCCH on the PCell and one or more hybrid automatic repeat request acknowledgements, HARQ-ACKs, for the second group are mapped to the PUCCH on the PSCell or the SPCell, the instructions being further executable to: decode a physical downlink control channel, PDCCH, with a cyclic redundancy check, CRC, scrambled by a random access radio network temporary identifier, RA-RNTI, in a common search space on the PCell; and decode a physical downlink control channel, PDCCH, with a cyclic redundancy check, CRC, scrambled by a random access radio network temporary identifier, RA-RNTI, in a common search space on the PSCell or the SPCell. receive a UE-specific radio resource control, RRC, message from a base station (160, 1060, 1160, 1760), the RRC message including a configuration to indicate a cell as a primary secondary cell, PSCell, or a secondary primary cell, SPCell, for a second group among multiple cell groups, each of which is constituted by one or more serving cells; wherein a cell configured with a physical uplink control channel, PUCCH, which is included in a first group of the multiple cell groups is a primary cell, PCell, and a cell configured with a PUCCH, which is included in the second group of the multiple cell groups is the PSCell or the SPCell, wherein the PSCell or the SPCell is used for a random access procedure between the UE (102, 1002, 1102, 1602) and the base station (160, 1060, 1160, 1760), and wherein one or more hybrid automatic repeat request acknowledgements, HARQ-ACKs, for the first group are mapped to the PUCCH on the PCell and one or more hybrid automatic repeat request acknowledgements, HARQ-ACKs, for the second group are mapped to the PUCCH on the PSCell or the SPCell, the instructions being further executable to: decode a physical downlink control channel, PDCCH, with a cyclic redundancy check, CRC, scrambled by a random access radio network temporary identifier, RA-RNTI, in a common search space on the PCell; and decode a physical downlink control channel, PDCCH, with a cyclic redundancy check, CRC, scrambled by a random access radio network temporary identifier, RA-RNTI, in a common search space on the PSCell or the SPCell. decode a physical downlink control channel, PDCCH, with a cyclic redundancy check, CRC, scrambled by a random access radio network temporary identifier, RA-RNTI, in a common search space on the PCell; and decode a physical downlink control channel, PDCCH, with a cyclic redundancy check, CRC, scrambled by a random access radio network temporary identifier, RA-RNTI, in a common search space on the PSCell or the SPCell.