A method performed by a user equipment (UE) in a wireless communication system comprises: receiving, from a base station, downlink control information (DCI) including a downlink assignment indicator (DAI); receiving, from the base station, data on a first physical downlink shared channel (PDSCH) based on the DCI; receiving, from the base station, data on a second PDSCH based on a semi-persistent scheduling (SPS); generating first HARQ-ACK bit information including first HARQ-ACK information for the data received on the first PDSCH based on the DAI; generating second HARQ-ACK bit information including second HARQ-ACK information for the second PDSCH; and transmitting, to the base station, third HARQ-ACK bit information including the first HARQ-ACK bit information and the second HARQ-ACK bit information on a physical uplink control channel (PUCCH), wherein the second HARQ-ACK bit information is located at the end of the third HARQ-ACK bit information, and wherein the DAI is associated with a number of at least one pair of serving cell and an occasion in which PDSCH transmission is present, and is indexed in ascending order of serving cell index, and then in ascending order of occasion index.