Techniques for handling hybrid automatic repeat request-acknowledgment (harq-ack) codebook size mismatch

A network entity, comprising:

• one or more memories storing processor-executable code;
• and
• one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the network entity to:
• output, to a user equipment (UE), one or more downlink messages;
• obtain, from the UE, an uplink control information message comprising hybrid automatic repeat request (HARQ) information corresponding to respective downlink messages of the one or more downlink messages, the HARQ information comprising one bit or two bits;
• and
• decode the HARQ information of the uplink control information message in accordance with a sequence cyclic shift value corresponding to a payload size of a zero-padded HARQ bit sequence comprising two bits or three bits, wherein the zero-padded HARQ bit sequence comprises the HARQ information received via the uplink control information message and one or more zero-padding bits implied by the network entity.

A method for wireless communications at a user equipment (UE), comprising:

• receiving, from a network entity, one or more downlink messages;
• generating hybrid automatic repeat request (HARQ) information corresponding to respective downlink messages of the one or more downlink messages, the HARQ information comprising one bit or two bits;
• generating an uplink control information message by appending one or more zero-padding bits to the HARQ information to generate a zero-padded HARQ bit sequence based at least in part on the HARQ information comprising one or two bits, wherein a payload size of the zero-padded HARQ bit sequence comprises two bits based at least in part on the HARQ information comprising one bit, or three bits based at least in part on the HARQ information comprising one bit or two bits;
• and
• transmitting the uplink control information message in accordance with a sequence cyclic shift value corresponding to the payload size of the zero-padded HARQ bit sequence.

A method for wireless communications at a network entity, comprising:

• outputting, to a user equipment (UE), one or more downlink messages;
• obtaining, from the UE, an uplink control information message comprising hybrid automatic repeat request (HARQ) information corresponding to respective downlink messages of the one or more downlink messages, the HARQ information comprising one bit or two bits;
• and
• decoding the HARQ information of the uplink control information message in accordance with a sequence cyclic shift value corresponding to a payload size of a zero-padded HARQ bit sequence comprising two bits or three bits, wherein the zero-padded HARQ bit sequence comprises the HARQ information received via the uplink control information message and one or more zero-padding bits implied by the network entity.