A method performed by a user equipment (130-1, 130-2, 130-3, 130-4, 130-5, 130-6, 1110), UE, for transmitting data for a wireless communication system, the method comprising steps of: receiving (S530, S700) information on a repeated transmission number of physical uplink shared channel, PUSCH, regarding uplink data from a base station (110-1, 110-2, 110-3, 120-1, 120-2, 1100); configuring (S540, S710) a plurality of PUSCHs corresponding to the repeated transmission number of the PUSCH; and sequentially transmitting the plurality of PUSCHs within one slot, wherein the plurality of PUSCHs include a first PUSCH and a second PUSCH, wherein the one slot includes a first mini-slot and a second mini-slot each of which consists of at least one orthogonal frequency division multiplexing, OFDM, symbol, wherein the first PUSCH is transmitted (S550, S720) in the first mini-slot and the second PUSCH is transmitted (S560, S730) in the second mini-slot, wherein the uplink data is transmitted through each of the first PUSCH transmission and the second PUSCH transmission, wherein a first frequency resource for the first PUSCH transmission and a second frequency resource for the second PUSCH transmission are differently changed within one slot, wherein, the repeated transmission of the PUSCH is performed either based on an uplink grant or without the uplink grant, characterized in that the repeated transmission number of UL data, the information on the time/frequency resource to be used upon repeated transmission and the MCS applied to each transmission upon repeated transmission are indicated via the use of downlink control information, DCI, signalling received from the base station (110-1, 110-2, 110-3, 120-1, 120-2, 1100) when the repeated transmission of the PUSCH is performed based on an UL grant and via the use of radio resource control, RRC, signalling received from the base station (110-1, 110-2, 110-3, 120-1, 120-2, 1100) when the repeated transmission of the PUSCH is performed without the UL grant. receiving (S530, S700) information on a repeated transmission number of physical uplink shared channel, PUSCH, regarding uplink data from a base station (110-1, 110-2, 110-3, 120-1, 120-2, 1100); configuring (S540, S710) a plurality of PUSCHs corresponding to the repeated transmission number of the PUSCH; and sequentially transmitting the plurality of PUSCHs within one slot, wherein the plurality of PUSCHs include a first PUSCH and a second PUSCH, wherein the one slot includes a first mini-slot and a second mini-slot each of which consists of at least one orthogonal frequency division multiplexing, OFDM, symbol, wherein the first PUSCH is transmitted (S550, S720) in the first mini-slot and the second PUSCH is transmitted (S560, S730) in the second mini-slot, wherein the uplink data is transmitted through each of the first PUSCH transmission and the second PUSCH transmission, wherein a first frequency resource for the first PUSCH transmission and a second frequency resource for the second PUSCH transmission are differently changed within one slot, wherein, the repeated transmission of the PUSCH is performed either based on an uplink grant or without the uplink grant, characterized in that the repeated transmission number of UL data, the information on the time/frequency resource to be used upon repeated transmission and the MCS applied to each transmission upon repeated transmission are indicated via the use of downlink control information, DCI, signalling received from the base station (110-1, 110-2, 110-3, 120-1, 120-2, 1100) when the repeated transmission of the PUSCH is performed based on an UL grant and via the use of radio resource control, RRC, signalling received from the base station (110-1, 110-2, 110-3, 120-1, 120-2, 1100) when the repeated transmission of the PUSCH is performed without the UL grant.