A method, performed by a terminal in a wireless communication system, of transmitting and receiving data, the method comprising: receiving, from a base station, information for scheduling multiple transmissions, hereinafter referred to as multiple transmission unit scheduling information; receiving, from a base station, information indicating whether demodulation reference signal, DMRS, time bundling is feasible with respect to DMRS information respectively contained in a plurality of transmission units scheduled according to the multiple transmission unit scheduling information; receiving the plurality of transmission units; performing a first channel estimation based on the received DMRS information included in a transmission unit among the plurality of transmission units without performing DMRS time bundling; decoding at least one of data from among data contained in the plurality of transmission units based on the first channel estimation result; when the decoding fails and the information indicates that the DMRS time bundling is feasible, performing the DMRS time bundling on at least two of the DMRS information from among the DMRS information respectively contained in the plurality of transmission units based on at least one of a hybrid automatic request, HARQ, acknowledge, ACK, transmission time, negative acknowledge, NACK, transmission time, a size of a frequency resource of a downlink, DL, physical data channel to which the data scheduled according to the multiple transmission unit scheduling information is assigned, a timing advance value, or a time required for a valid data process; performing a second channel estimation based on the time bundled DMRS information; and decoding the at least one of data from among data contained in the plurality of transmission units based on the second channel estimation result. receiving, from a base station, information for scheduling multiple transmissions, hereinafter referred to as multiple transmission unit scheduling information; receiving, from a base station, information indicating whether demodulation reference signal, DMRS, time bundling is feasible with respect to DMRS information respectively contained in a plurality of transmission units scheduled according to the multiple transmission unit scheduling information; receiving the plurality of transmission units; performing a first channel estimation based on the received DMRS information included in a transmission unit among the plurality of transmission units without performing DMRS time bundling; decoding at least one of data from among data contained in the plurality of transmission units based on the first channel estimation result; when the decoding fails and the information indicates that the DMRS time bundling is feasible, performing the DMRS time bundling on at least two of the DMRS information from among the DMRS information respectively contained in the plurality of transmission units based on at least one of a hybrid automatic request, HARQ, acknowledge, ACK, transmission time, negative acknowledge, NACK, transmission time, a size of a frequency resource of a downlink, DL, physical data channel to which the data scheduled according to the multiple transmission unit scheduling information is assigned, a timing advance value, or a time required for a valid data process; performing a second channel estimation based on the time bundled DMRS information; and decoding the at least one of data from among data contained in the plurality of transmission units based on the second channel estimation result. <EOS>