A method for transmitting an uplink data channel by a user equipment based on Demodulation Reference Signal, DMRS, sharing in a wireless communication system, the method comprising: receiving, from a base station, first downlink control information, DCI, for scheduling the uplink data channel in an n-th subslot, receiving, from the base station, second DCI for scheduling the uplink data channel in an n+k-th subslot, wherein k is one, and transmitting, to the base station, the uplink data channel, wherein the first DCI comprises information for a first Demodulation Reference Signal, DMRS, pattern, information for a cyclic shift, information for an Interleaved Frequency Division Multiple Access, IFDMA, comb, information for resource allocation, information for a precoding, and/or information for a number of layers related to the uplink data channel, wherein the second DCI comprises information for a second Demodulation Reference Signal, DMRS, pattern, the information for a cyclic shift, the information for an Interleaved Frequency Division Multiple Access, IFDMA, comb, the information for resource allocation, the information for a precoding, and/or the information for a number of layers related to the uplink data channel, wherein the first DMRS pattern indicates DMRS pattern in the n-th subslot and the n+k-th subslot based on the DMRS sharing, wherein when the first DMRS pattern indicates DMRS transmission in a first symbol of the n+k-th subslot and the second DMRS pattern does not indicate DMRS transmission in the first symbol of the n+k-th subslot, the uplink data channel is transmitted based on the first DCI and the second DCI is discarded by the user equipment, wherein when both the first DMRS pattern and the second DMRS pattern indicates DMRS transmission in the first symbol of the n+k-th subslot, and at least one of the information for the cyclic shift, the information for the IFDMA comb, the information for the resource allocation, the information for the precoding, and/or the information for the number of layers is inconsistent between the first DCI and the second DCI, the uplink data channel is transmitted based on the first DCI and the second DCI is discarded by the user equipment, and wherein the n-th subslot and the n+k-th subslot comprise, respectively, two or three Orthogonal Frequency Division Multiplexing, OFDM, symbols. receiving, from a base station, first downlink control information, DCI, for scheduling the uplink data channel in an n-th subslot, receiving, from the base station, second DCI for scheduling the uplink data channel in an n+k-th subslot, wherein k is one, and transmitting, to the base station, the uplink data channel, wherein the first DCI comprises information for a first Demodulation Reference Signal, DMRS, pattern, information for a cyclic shift, information for an Interleaved Frequency Division Multiple Access, IFDMA, comb, information for resource allocation, information for a precoding, and/or information for a number of layers related to the uplink data channel, wherein the second DCI comprises information for a second Demodulation Reference Signal, DMRS, pattern, the information for a cyclic shift, the information for an Interleaved Frequency Division Multiple Access, IFDMA, comb, the information for resource allocation, the information for a precoding, and/or the information for a number of layers related to the uplink data channel, wherein the first DMRS pattern indicates DMRS pattern in the n-th subslot and the n+k-th subslot based on the DMRS sharing, wherein when the first DMRS pattern indicates DMRS transmission in a first symbol of the n+k-th subslot and the second DMRS pattern does not indicate DMRS transmission in the first symbol of the n+k-th subslot, the uplink data channel is transmitted based on the first DCI and the second DCI is discarded by the user equipment, wherein when both the first DMRS pattern and the second DMRS pattern indicates DMRS transmission in the first symbol of the n+k-th subslot, and at least one of the information for the cyclic shift, the information for the IFDMA comb, the information for the resource allocation, the information for the precoding, and/or the information for the number of layers is inconsistent between the first DCI and the second DCI, the uplink data channel is transmitted based on the first DCI and the second DCI is discarded by the user equipment, and wherein the n-th subslot and the n+k-th subslot comprise, respectively, two or three Orthogonal Frequency Division Multiplexing, OFDM, symbols.