A User equipment, UE, configured to communicate with a base station apparatus, the UE comprising: a receiving unit configured to receive downlink control information, DCI, in a physical downlink control channel, PDCCH, and receive a radio resource control, RRC, signaling in a physical downlink shared channel, PDSCH; a control unit configured to acquire the DCI and the RRC signaling from the receiving unit and generate a hybrid automatic repeat request-acknowledgment, HARQ-ACK, corresponding to the PDSCH that the receiving unit receives in a second downlink slot, wherein the end point of the second downlink slot is included in a first uplink slot n; a mapping unit configured to map a physical uplink control channel, PUCCH, in a first uplink slot n+k based on a unit of a slot duration for each of first uplink slots; and a transmitting unit configured to transmit the HARQ-ACK in the PUCCH after receiving the HARQ-ACK from the mapping unit, and transmit UE capability indicating that a transmission using a plurality of subcarrier spacings is supported, wherein first information is included in the DCI and/or the RRC signaling, the first information being timing information for a transmission of the HARQ-ACK, the RRC signaling includes second information regarding subcarrier spacing of the PDSCH and third information regarding subcarrier spacing of the PUCCH, and the second information and the third information are configured independently of each other, the transmitting unit is configured to transmit the HARQ-ACK in the first uplink slot n+k, the control unit is configured to configure index k to be a number of the first uplink slots based on the first information and by using, as the unit of the slot duration for each of the first uplink slots, a duration of the first uplink slot n+k for the PUCCH to transmit the HARQ-ACK, a first duration for each of the first uplink slots is dependent on the third information, a second duration of the second downlink slot for the PDSCH is dependent on the second information, and a quantity of a first plurality of orthogonal frequency domain multiplexing, OFDM, symbols included in each of the first uplink slots is the same as a quantity of a second plurality of OFDM symbols included in the second downlink slot, wherein a first length for each of the first plurality of OFDM symbols is different from a second length for each of the second plurality of OFDM symbols. a receiving unit configured to receive downlink control information, DCI, in a physical downlink control channel, PDCCH, and receive a radio resource control, RRC, signaling in a physical downlink shared channel, PDSCH; a control unit configured to acquire the DCI and the RRC signaling from the receiving unit and generate a hybrid automatic repeat request-acknowledgment, HARQ-ACK, corresponding to the PDSCH that the receiving unit receives in a second downlink slot, wherein the end point of the second downlink slot is included in a first uplink slot n; a mapping unit configured to map a physical uplink control channel, PUCCH, in a first uplink slot n+k based on a unit of a slot duration for each of first uplink slots; and a transmitting unit configured to transmit the HARQ-ACK in the PUCCH after receiving the HARQ-ACK from the mapping unit, and transmit UE capability indicating that a transmission using a plurality of subcarrier spacings is supported, wherein first information is included in the DCI and/or the RRC signaling, the first information being timing information for a transmission of the HARQ-ACK, the RRC signaling includes second information regarding subcarrier spacing of the PDSCH and third information regarding subcarrier spacing of the PUCCH, and the second information and the third information are configured independently of each other, the transmitting unit is configured to transmit the HARQ-ACK in the first uplink slot n+k, the control unit is configured to configure index k to be a number of the first uplink slots based on the first information and by using, as the unit of the slot duration for each of the first uplink slots, a duration of the first uplink slot n+k for the PUCCH to transmit the HARQ-ACK, a first duration for each of the first uplink slots is dependent on the third information, a second duration of the second downlink slot for the PDSCH is dependent on the second information, and a quantity of a first plurality of orthogonal frequency domain multiplexing, OFDM, symbols included in each of the first uplink slots is the same as a quantity of a second plurality of OFDM symbols included in the second downlink slot, wherein a first length for each of the first plurality of OFDM symbols is different from a second length for each of the second plurality of OFDM symbols.