Resource reservation and release in sidelink

An apparatus for wireless communications, comprising:

• at least one processor configured to reserve at least one resource from a resource pool comprising a plurality of time-frequency resources allocated for sidelink communications with one or more other apparatuses, wherein reserving the at least one resource results in at least one resource reservation;
• a transmitter configured to transmit control information comprising a first indication of the at least one resource reservation and a second indication of whether the at least one resource reservation is releasable, wherein the second indication indicates whether the at least one resource reserved by the apparatus can be reclaimed by one or more user equipments (UEs) based on the at least one resource being for a feedback based transmission;
• and
• a memory coupled to the at least one processor.

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

• receiving control information comprising (i) a first indication of at least one resource reservation by a second UE from a resource pool comprising a plurality of time-frequency resources available for sidelink communications and (ii) a second indication of whether the at least one resource reservation is releasable, wherein the at least one resource reservation comprises reservation of at least one resource from the resource pool by the second UE, and wherein the second indication indicates whether the at least one resource reserved by the second UE can be reclaimed by the first UE based on the at least one resource being for a feedback based transmission;
• reclaiming the at least one resource reservation based at least in part on the control information;
• and
• selecting a set of resource reservations from the resource pool to use for sidelink communications based on reclaiming the at least one resource reservation.

An apparatus for wireless communication, comprising:

• a receiver configured to receive control information comprising (i) a first indication of at least one resource reservation by another apparatus from a resource pool comprising a plurality of time-frequency resources available for sidelink communications and (ii) a second indication of whether the at least one resource reservation is releasable, wherein the at least one resource reservation comprises reservation of at least one resource from the resource pool by a user equipment (UE), and wherein the second indication indicates whether the at least one resource reserved by the UE can be reclaimed by apparatus based on the at least one resource being for a feedback based transmission;
• at least one processor configured to:
• reclaim the at least one resource reservation based at least in part on the control information;
• and
• select a set of resource reservations from the resource pool to use for sidelink communications based on reclaiming the at least one resource reservation;
• and
• a memory coupled to the at least one processor.