This disclosure provides systems, devices, apparatus, and methods, including computer programs encoded on storage media, for ACK/NACK-triggered communications with a UE based on multiple ACK/NACK bits in HARQ feedback from a UE. The UE may receive a configuration for a resource, monitor for one or more PDSCH transmissions, and transmit an uplink transmission including HARQ feedback carrying multiple NACK or ACK bits for the one or more PDSCH transmissions. The UE may transmit or receive communication in the resource based on a trigger in the HARQ feedback for transmission or reception of the communication in the resource.