Techniques for configuring multiple frequency domain opportunities for sidelink feedback

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

• transmitting, to a second UE, a control message including a configuration of a plurality of feedback channel occasions in a plurality of sub-bands of an unlicensed radio frequency spectrum band, the plurality of feedback channel occasions for feedback associated with a transmission and corresponding to a first sidelink data channel in a first sub-band of the unlicensed radio frequency spectrum band;
• transmitting, to the second UE, the transmission over the first sidelink data channel in the first sub-band of the unlicensed radio frequency spectrum band, the plurality of feedback channel occasions associated with the transmission transmitted to the second UE over the first sidelink data channel in the first sub-band, the UE operable to receive, from the second UE, the feedback associated with the transmission using one or more of the plurality of feedback channel occasions;
• and
• receiving, from the second UE, the feedback associated with the transmission over one or more feedback channel occasions of the plurality of feedback channel occasions based at least in part on a listen-before-talk for each of the plurality of feedback channel occasions, wherein the listen-before-talk for each of the plurality of feedback channel occasions is based at least in part on the configuration of the plurality of feedback channel occasions.

An apparatus for wireless communication at a user equipment (UE), comprising:

• a processor;
• memory coupled with the processor;
• and
• instructions stored in the memory and executable by the processor to cause the apparatus to:
• receive, from a second UE, a control message including a configuration of a plurality of feedback channel occasions for transmitting feedback associated with a transmission, the plurality of feedback channel occasions corresponding to a first sidelink data channel in a first sub-band of an unlicensed radio frequency spectrum band;
• receive, from the second UE, the transmission over the first sidelink data channel in the first sub-band of the unlicensed radio frequency spectrum band;
• perform, based at least in part on the configuration of the plurality of feedback channel occasions, a listen-before-talk for each of the plurality of feedback channel occasions, the plurality of feedback channel occasions associated with the transmission received from the second UE over the first sidelink data channel in the first sub-band, the plurality of feedback channel occasions in a plurality of sub-bands, the UE operable to transmit, to the second UE, the feedback associated with the transmission using one or more of the plurality of feedback channel occasions;
• and
• transmit, to the second UE, the feedback associated with the transmission over one or more feedback channel occasions of the plurality of feedback channel occasions based at least in part on performing the listen-before-talk for each of the plurality of feedback channel occasions.

An apparatus for wireless communication at a user equipment (UE), comprising:

• a processor;
• memory coupled with the processor;
• and
• instructions stored in the memory and executable by the processor to cause the apparatus to:
• transmit, to a second UE, a control message including a configuration of a plurality of feedback channel occasions in a plurality of sub-bands of an unlicensed radio frequency spectrum band, the plurality of feedback channel occasions for feedback associated with a transmission and corresponding to a first sidelink data channel in a first sub-band of the unlicensed radio frequency spectrum band;
• transmit, to the second UE, the transmission over the first sidelink data channel in the first sub-band of the unlicensed radio frequency spectrum band, the plurality of feedback channel occasions associated with the transmission transmitted to the second UE over the first sidelink data channel in the first sub-band, the UE operable to receive, from the second UE, the feedback associated with the transmission using one or more of the plurality of feedback channel occasions;
• and
• receive, from the second UE, the feedback associated with the transmission over one or more feedback channel occasions of the plurality of feedback channel occasions based at least in part on a listen-before-talk for each of the plurality of feedback channel occasions, wherein the listen-before-talk for each of the plurality of feedback channel occasions is based at least in part on the configuration of the plurality of feedback channel occasions.