System and method of HARQ-ACK timing and PUCCH resource determination for ultra-low latency PDSCH transmission

A base station (BS), comprising:

• one or more non-transitory computer-readable media storing one or more instructions;
• and
• at least one processor coupled to the one or more non-transitory computer-readable media and configured to execute the one or more instructions to cause the BS to:
• determine first Hybrid Automatic Repeat Request-Acknowledgment (HARQ-ACK) feedback timing of a first HARQ-ACK feedback used for a first physical downlink shared channel (PDSCH) transmission;
• determine second HARQ-ACK feedback timing of a second HARQ-ACK feedback used for a second PDSCH transmission;
• determine a first physical uplink control channel (PUCCH) resource for the first HARQ-ACK feedback;
• and
• determine a second PUCCH resource for the second HARQ-ACK feedback;
• receive at least a first HARQ-ACK bit based on the first HARQ-ACK feedback timing and the first PUCCH resource;
• and
• receive at least a second HARQ-ACK bit based on the second HARQ-ACK feedback timing and the second PUCCH resource, wherein:
• the first HARQ-ACK feedback timing is determined by a first PDSCH-to-HARQ-timing indicator field in first Downlink Control Information (DCI),
• the first PDSCH-to-HARQ-timing indicator field corresponds to a value of a first radio resource control (RRC) configured table,
• the second HARQ-ACK feedback timing is determined by a second PDSCH-to-HARQ-timing indicator field in second DCI,
• the second PDSCH-to-HARQ-timing indicator field corresponds to a value of a second RRC configured table,
• the first PDSCH-to-HARO-timing indicator field corresponding to the value of the first RRC configured table indicates a number of symbols or a number of sub-slots after the first PDSCH transmission,
• the first RRC configured table and the second RRC configured table are different RRC configured tables,
• the first PUCCH resource is selected from a first PUCCH resource set based on a first ACK resource indicator field in the first DCI,
• the second PUCCH resource is selected from a second PUCCH resource set based on a second resource indicator field in the second DCI,
• the first PUCCH resource set and the second PUCCH resource set are configured separately, and
• the first PUCCH resource set is for ultra-reliable low-latency communication (URLLC) and the second PUCCH resource set is for enhanced mobile broadband (eMBB).