Hybrid automatic repeat request (HARQ) codebook enhancement and physical uplink control channel (PUCCH) resource determination with sidelink feedback forwarding

A An apparatus for wireless communications at a first user equipment (UE), comprising:

• one or more memories comprising instructions;
• and
• one or more processors configured to execute the instructions and cause the apparatus to:
• receive, from a network entity, a downlink control information (DCI) that schedules resources for at least one physical sidelink shared channel (PSSCH) transmission from the first UE to a second UE;
• transmit data to the second UE via the at least one PSSCH transmission using the scheduled resources;
• receive, from the second UE, an acknowledgment feedback for the at least one PSSCH transmission in a first slot associated with a first feedback timing value, wherein the first feedback timing value indicates a first number of slots between reception of the acknowledgment feedback and transmission of the acknowledgment feedback;
• receive at least one downlink transmission from the network entity in a second slot associated with a second feedback timing value, wherein the second feedback timing value indicates a second number of slots between reception of the at least one downlink transmission and transmission of a feedback for the at least one downlink transmission, and wherein different feedback timing values associated with the first slot and the second slot correspond to a third slot;
• select at least one codebook entry for providing the feedback for the at least one downlink transmission and the acknowledgment feedback for the at least one PSSCH transmission in the third slot;
• and
• transmit the at least one codebook entry to the network entity via at least one physical uplink control channel (PUCCH) transmission in the third slot.

A non-transitory computer-readable medium comprising computer-executable instructions that, when executed by one or more processors of a first user equipment (UE), cause the first UE to perform a method of wireless communications, comprising:

• receiving, from a network entity, a downlink control information (DCI) that schedules resources for at least one physical sidelink shared channel (PSSCH) transmission from the first UE to a second UE;
• transmitting data to the second UE via the at least one PSSCH transmission using the scheduled resources;
• receiving, from the second UE, an acknowledgment feedback for the at least one PSSCH transmission in a first slot associated with a first feedback timing value, wherein the first feedback timing value indicates a first number of slots between reception of the acknowledgment feedback and transmission of the acknowledgment feedback;
• receiving at least one downlink transmission from the network entity in a second slot associated with a second feedback timing value, wherein the second feedback timing value indicates a second number of slots between reception of the at least one downlink transmission and transmission of a feedback for the at least one downlink transmission, and wherein different feedback timing values associated with the first slot and the second slot correspond to a third slot;
• selecting at least one codebook entry for providing the feedback for the at least one downlink transmission and the acknowledgment feedback for the at least one PSSCH transmission in the third slot;
• and
• transmitting the at least one codebook entry to the network entity via at least one physical uplink control channel (PUCCH) transmission in the third slot.