A user equipment (UE) is disclosed. The UE comprises a processor configured to perform operations comprising receiving a hybrid automatic repeat request process group (HPG) configuration signal from a base station associated therewith, wherein the HPG configuration signal comprises information of a plurality HARQ process groups (HPGs), each HPG comprising one or more HARQ processes of a set of HARQ processes configured for the UE. The operations further comprise receiving a downlink control information (DCI) from the base station, wherein the DCI comprises information that identifies one or more HPGs of the plurality of HPGs, the HARQ-ACK feedback information of which are to be included in a HARQ-ACK feedback signal that is triggered by the DCI. In addition, the operations comprise generating the HARQ-ACK feedback signal comprising the HARQ-ACK feedback information of HARQ processes associated with the one or more HPGs and sending the HARQ-ACK feedback signal to the base station.