A method and apparatus for harq-ack sub-codebook combination

An apparatus, comprising:

• a receiving circuitry;
• a transmitting circuitry;
• and
• a processor coupled to the receiving circuitry and the transmitting circuitry configured to cause the apparatus to:
• receive a first downlink control information (DCI) format for scheduling a physical downlink shared channel (PDSCH) transmission in a first PDSCH group, wherein the first DCI format includes an indicator for requesting that first hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback corresponding to the first PDSCH group and second HARQ-ACK feedback corresponding to a second PDSCH group are to be transmitted in a same HARQ-ACK codebook, and the PDSCH transmission is a last PDSCH transmission in the first PDSCH group received by the apparatus before transmission of the HARQ-ACK feedback corresponding to the first PDSCH group;
• and
• transmit a HARQ-ACK codebook, wherein the HARQ-ACK codebook includes at least two parts, a first part of the HARQ-ACK codebook comprises HARQ-ACK information bits for the first PDSCH group, and a second part of the HARQ-ACK codebook comprises HARQ-ACK information bits for the second PDSCH group.

An apparatus, comprising:

• a receiving circuitry;
• a transmitting circuitry;
• and
• a processor coupled to the receiving circuitry and the transmitting circuitry configured to cause the apparatus to:
• transmit, to a user equipment (UE), a first downlink control information (DCI) format for scheduling a physical downlink shared channel (PDSCH) transmission in a first PDSCH group, wherein the first DCI format includes an indicator for requesting that first hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback corresponding to the first PDSCH group and second HARQ-ACK feedback corresponding to a second PDSCH group are to be transmitted in a same HARQ-ACK codebook, and the PDSCH transmission is a last PDSCH transmission in the first PDSCH group transmitted by the apparatus before reception of the HARQ-ACK feedback corresponding to the first PDSCH group;
• and
• receive, from the UE, a HARQ-ACK codebook, wherein the HARQ-ACK codebook includes at least two parts, a first part of the HARQ-ACK codebook comprises HARQ-ACK information bits for the first PDSCH group, and a second part of the HARQ-ACK codebook comprises HARQ-ACK information bits for the second PDSCH group.