A user equipment capable of receiving communications from a cell in a 3GPP wireless communication network comprising at least one base station, the user equipment, UE, comprising: a receiver configured to: receive, from a base station, physical uplink control channel, PUCCH, configuration information via a radio resource control, RRC, signaling, receive , from the base station, downlink control information scheduling downlink data on a physical downlink control channel, PDCCH, and receive, from the base station, the downlink data on a physical downlink shared channel, PDSCH; and a transmitter configured to transmit , to the base station, HARQ-ACK information associated with the downlink data and a PUCCH reference signal, RS, based on a PUCCH resource, wherein a resource index of the PUCCH resource, n PUCCH 1 , is determined by a following equation: n PUCCH 1 = n CCE + N PUCCH 1 , where n CCE is a number of a smallest channel control element, CCE, used for a transmission of the downlink control information, and N PUCCH 1 is a UE-specific resource offset parameter in case that the UE-specific resource offset parameter is configured in the PUCCH configuration information and a cell-specific resource offset parameter configured in the PUCCH configuration information in case that the UE-specific resource offset parameter is not configured in the PUCCH configuration information, wherein the PUCCH RS is generated by a sequence group number u derived from a following equation: u = f gh n s + f ss mod 30 , where f gh ( n s ) is a group hopping pattern and f ss is a sequence-shift pattern, wherein the sequence-shift pattern f ss is determined by a following equation: f ss PUCCH = N mod 30 , where N is a UE-specific RS base sequence parameter if the UE-specific RS base sequence parameter is configured to the UE in the PUCCH configuration information, otherwise N is cell identification information, receive, from a base station, physical uplink control channel, PUCCH, configuration information via a radio resource control, RRC, signaling, receive , from the base station, downlink control information scheduling downlink data on a physical downlink control channel, PDCCH, and receive, from the base station, the downlink data on a physical downlink shared channel, PDSCH; and a transmitter configured to transmit , to the base station, HARQ-ACK information associated with the downlink data and a PUCCH reference signal, RS, based on a PUCCH resource, wherein a resource index of the PUCCH resource, n PUCCH 1 , is determined by a following equation: n PUCCH 1 = n CCE + N PUCCH 1 , where n CCE is a number of a smallest channel control element, CCE, used for a transmission of the downlink control information, and N PUCCH 1 is a UE-specific resource offset parameter in case that the UE-specific resource offset parameter is configured in the PUCCH configuration information and a cell-specific resource offset parameter configured in the PUCCH configuration information in case that the UE-specific resource offset parameter is not configured in the PUCCH configuration information, wherein the PUCCH RS is generated by a sequence group number u derived from a following equation: u = f gh n s + f ss mod 30 , where f gh ( n s ) is a group hopping pattern and f ss is a sequence-shift pattern, wherein the sequence-shift pattern f ss is determined by a following equation: f ss PUCCH = N mod 30 , where N is a UE-specific RS base sequence parameter if the UE-specific RS base sequence parameter is configured to the UE in the PUCCH configuration information, otherwise N is cell identification information, <EOS>