Coded sidelink feedback for improved reliability

An apparatus for wireless communications at a first user equipment, comprising:

• at least one processor;
• and
• at least one memory coupled with the at least one processor, with instructions stored in the at least one memory, when the instructions are executed by the at least one processor, individually or in any combination, cause the apparatus to:
• transmit at least one sidelink message via one or more sidelink channels;
• receive a first sidelink feedback message via a first feedback resource of a physical sidelink feedback channel occasion the first sidelink feedback message comprising a first subset of feedback bits indicating a plurality of acknowledgements or negative acknowledgements corresponding to the at least one sidelink message;
• and
• receive at least two additional sidelink feedback messages via respective feedback resources, a first additional sidelink feedback message comprising both the first subset of feedback bits received via the first sidelink feedback message and a second subset of feedback bits included in a second sidelink feedback message, wherein the first subset of feedback bits are encoded with the second subset of feedback bits using an erasure coding function.

An apparatus for wireless communications at a wireless device, comprising:

• at least one processor;
• and
• at least one memory coupled with the at least one processor, with instructions stored in the at least one memory, when the instructions are executed by the at least one processor, individually or in any combination, cause the apparatus to:
• monitor for a first sidelink feedback message comprising a first subset of feedback bits indicating a plurality of acknowledgements or negative acknowledgements corresponding to a first sidelink message and a second sidelink feedback message comprising a second subset of feedback bits indicating a plurality of acknowledgements or negative acknowledgements corresponding to a second sidelink message;
• and
• transmit an additional sidelink feedback message via a feedback resource, the additional sidelink feedback message comprising both the first subset of feedback bits and the second subset of feedback bits, wherein the first subset of feedback bits are encoded with the second subset of feedback bits using an erasure coding function.

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

• generating a plurality of feedback bits corresponding to sidelink messages received via one or more sidelink channels, the plurality of feedback bits indicating a respective plurality of acknowledgements or negative acknowledgements for the sidelink messages;
• transmitting a first sidelink feedback message via a first feedback resource of a physical sidelink feedback channel occasion, the first sidelink feedback message comprising a first subset of feedback bits of the plurality of feedback bits;
• and
• transmitting at least two additional sidelink feedback messages via respective feedback resources, a first additional sidelink feedback message comprising both the first subset of feedback bits transmitted via the first sidelink feedback message and a second subset of feedback bits of the plurality of feedback bits included in a second sidelink feedback message, wherein the first subset of feedback bits are encoded with the second subset of feedback bits using an erasure coding function.