Techniques for low-latency sidelink feedback transmission

A method for wireless communications at a first wireless device, comprising:

• communicating control signaling indicating a plurality of sidelink channels of a sidelink resource pool, a mapping between each sidelink channel of the plurality of sidelink channels to a corresponding feedback channel of a plurality of feedback channels, and a time gap between sidelink channel transmission and feedback transmission with respect to a feedback channel sub-slot of a plurality of feedback channel sub-slots within a slot;
• transmitting a sidelink data message on a first sidelink channel of the plurality of sidelink channels;
• and
• receiving, in accordance with the mapping and the time gap, sidelink feedback information for the sidelink data message in the feedback channel sub-slot of the slot on a first feedback channel of the plurality of feedback channels corresponding to the first sidelink channel.

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

• at least one processor;
• memory coupled with the at least one processor;
• and
• instructions stored in the memory and executable by the at least one processor to cause the apparatus to:
• 7 receive control signaling indicating a plurality of sidelink channels of a sidelink resource pool, a mapping between each sidelink channel of the plurality of sidelink channels to a corresponding feedback channel of a plurality of feedback channels, and a time gap between sidelink channel transmission and feedback transmission with respect to a feedback channel sub-slot of a plurality of feedback channel sub-slots within a slot;
• receive a sidelink data message on a first sidelink channel of the plurality of sidelink channels;
• and
• transmit, in accordance with the mapping and the time gap, sidelink feedback information for the sidelink data message in the feedback channel sub-slot of the slot on a first feedback channel of the plurality of feedback channels corresponding to the first sidelink channel.

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

• at least one processor;
• memory coupled with the at least one processor;
• and
• instructions stored in the memory and executable by the at least one processor to cause the apparatus to:
• communicate control signaling indicating a plurality of sidelink channels of a sidelink resource pool, a mapping between each sidelink channel of the plurality of sidelink channels to a corresponding feedback channel of a plurality of feedback channels, and a time gap between sidelink channel transmission and feedback transmission with respect to a feedback channel sub-slot of a plurality of feedback channel sub-slots within a slot;
• transmit a sidelink data message on a first sidelink channel of the plurality of sidelink channels;
• and
• receive, in accordance with the mapping and the time gap, sidelink feedback information for the sidelink data message in the feedback channel sub-slot of the slot on a first feedback channel of the plurality of feedback channels corresponding to the first sidelink channel.