Configurable transmission timeline for physical sidelink feedback channel

A method of wireless communication performed by a first user equipment, comprising:

• receiving, from a second user equipment and in sidelink control information, an indication of a first time buffer threshold, different from one or more candidate time buffer thresholds configured by a network node for selection by the first UE, associated with providing first sidelink hybrid automatic repeat request feedback on a physical sidelink feedback channel, the first time buffer threshold being based at least in part on a user equipment capability of the first user equipment;
• transmitting, to the second user equipment and in the sidelink control information, one or more indications of:
• a rejection to use the first time buffer threshold, and
• a second time buffer threshold, of the one or more time buffer thresholds, associated with providing the first sidelink hybrid automatic repeat request feedback;
• receiving, from the second user equipment, an indication of an agreement to use the second time buffer threshold;
• transmitting, to the second user equipment, using a first physical sidelink feedback control channel (PSFCH) sequence associated with the first user equipment, and based at least in part on the indication of the agreement, the first sidelink hybrid automatic repeat request feedback,
• the first sidelink hybrid automatic repeat request feedback being transmitted on the physical sidelink feedback channel based at least in part on the second time buffer threshold;
• and
• receiving, from the second user equipment and based at least in part on transmitting the first sidelink hybrid automatic repeat request feedback, the first sidelink hybrid automatic repeat request feedback for a sidelink communication transmitted to the second user equipment;
• and
• transmitting, to the second user equipment, second sidelink hybrid automatic repeat request feedback, using a second PSFCH sequence associated with the second user equipment, based at least in part on:
• receiving the first sidelink hybrid automatic repeat request feedback, and
• a collision between the first sidelink hybrid automatic repeat request feedback, received by the first user equipment and third sidelink hybrid automatic repeat request feedback, received from with a third user equipment.

A method of wireless communication performed by a first user equipment, comprising:

• identifying a first time buffer threshold, a plurality of candidate time buffer thresholds configured by a network node for selection by the first UE, associated with providing first sidelink hybrid automatic repeat request feedback on a physical sidelink feedback channel,
• the first time buffer threshold being based at least in part on a user equipment capability of the first user equipment;
• transmitting an indication of the first time buffer threshold to one or more other user equipment,
• the indication of the first time buffer threshold being included in sidelink control information;
• receiving, from the one or more other user equipment and sidelink control information, one or more indications of:
• a rejection of the first time buffer threshold, and
• a second time buffer threshold, of the plurality of candidate time buffer thresholds, associated with providing the first sidelink hybrid automatic repeat request feedback;
• transmitting, to the one or more other user equipment, using a first physical sidelink feedback control channel (PSFCH) sequence associated with the first user equipment, and based at least in part on the indication of the second time buffer threshold, the first sidelink hybrid automatic repeat request feedback for a sidelink communication received from the one or more other user equipment;
• and
• receiving, from the second user equipment, second sidelink hybrid automatic repeat request feedback, using a second PSFCH sequence associated with the second user equipment, based at least in part on:
• transmitting the first sidelink hybrid automatic repeat request feedback, and
• a collision between the first sidelink hybrid automatic repeat request feedback, transmitted by the first user equipment and third sidelink hybrid automatic repeat request feedback, received from a third user equipment.

A first user equipment for wireless communication, comprising:

• one or more memories;
• and
• one or more processors coupled to the one or more memories, the one or more processors configured to:
• transmit, to a second user equipment and in sidelink control information, an indication of a first time buffer threshold, of a plurality of time buffer thresholds configured by a network node for selection by the first UE, associated with providing first sidelink hybrid automatic repeat request feedback on a physical sidelink feedback channel,
• the first time buffer threshold being based at least in part on a user equipment capability of the first user equipment;
• receive, from the second user equipment and the sidelink control information, one or more indications of:
• a rejection to use the first time buffer threshold, and
• a second time buffer threshold, of the plurality of time buffer thresholds, associated with providing the first sidelink hybrid automatic repeat request feedback;
• transmit, to the second user equipment, an indication of an agreement to use the second time buffer threshold;
• and
• transmit, to the second user equipment, using a first physical sidelink feedback control channel (PSFCH) sequence associated with the first user equipment, and based at least in part on the indication of the agreement, the first sidelink hybrid automatic repeat request feedback for a sidelink communication received from the second user equipment,
• the first sidelink hybrid automatic repeat request feedback being transmitted on the physical sidelink feedback channel based at least in part on the second time buffer threshold;
• and
• receive, from the second user equipment, second sidelink hybrid automatic repeat request feedback, using a second PSFCH sequence associated with the second user equipment, based at least in part on:
• transmitting the first sidelink hybrid automatic repeat request feedback, and
• a collision between the first sidelink hybrid automatic repeat request feedback, transmitted by the first user equipment and third sidelink hybrid automatic repeat request feedback, received from a third user equipment.