Method for data transmissions and a user equipment (UE) are provided. A method includes the following. A UE receives first downlink control information (DCI), where the first DCI is used for scheduling a first physical downlink shared channel (PDSCH), the first DCI includes a first information field, a value of the first information field includes a specific value or a non-specific value, and the specific value indicates that ACK/NACK information corresponding to the first PDSCH is transmitted according to a later trigger signal. A value or a value range of an identity (ID) of a hybrid automatic repeat request (HARQ) process corresponding to a second PDSCH received after reception of the first PDSCH is determined according to the value of the first information field by the UE.