Resource reservation signaling for aperiodic reservations

1. An apparatus for wireless communication at wireless device, comprising:

a memory; and

at least one processor coupled to the memory, the at least one processor and the memory being configured to:

transmit sidelink control information (SCI) indicating an aperiodic resource reservation and indicating a time gap between aperiodic resource reservations based at least in part on supplemental bits that include one or more bits that support information about a periodic resource reservation; and

transmit aperiodic sidelink messages based on the aperiodic resource reservation and the indicated time gap between the aperiodic resource reservations.

2. The apparatus of claim 1 , wherein the at least one processor is configured to transmit the aperiodic sidelink messages on a resource pool that supports the periodic resource reservation.

3. The apparatus of claim 1 , wherein the supplemental bits include bits that support a backward indication of a previous resource for the periodic resource reservation.

4. The apparatus of claim 1 , wherein the supplemental bits include a first number of bits if a resource reservation is for a single reservation per transmission and includes a second number of bits if the resource reservation is for multiple reservations per transmission.

5. The apparatus of claim 1 , wherein the supplemental bits include at least one bit that supports indicating that a resource reservation is periodic or aperiodic.

6. The apparatus of claim 1 , wherein the time gap is indicated with a combination of the supplemental bits that support the periodic resource reservation and bits for time gap signaling.

7. The apparatus of claim 1 , wherein at least one bit of the SCI indicates a codepoint for a non-periodic reservation.

8. A method of wireless communication at a wireless device, comprising:

transmitting sidelink control information (SCI) indicating an aperiodic resource reservation and indicating a time gap between aperiodic resource reservations based at least in part on supplemental bits that include one or more bits that support information about a periodic resource reservation; and

transmitting aperiodic sidelink messages based on the aperiodic resource reservation and the indicated time gap between the aperiodic resource reservations.

9. The method of claim 8 , wherein the aperiodic sidelink messages are transmitted on a resource pool that supports the periodic resource reservation.

10. The method of claim 8 , wherein the supplemental bits include bits that support a backward indication of a previous resource for the periodic resource reservation.

11. The method of claim 8 , wherein the supplemental bits include a first number of bits if a resource reservation is for a single reservation per transmission and includes a second number of bits if the resource reservation is for multiple reservations per transmission.

12. The method of claim 8 , wherein the supplemental bits include at least one bit that supports indicating whether a resource reservation is periodic.

13. The method of claim 8 , wherein the time gap is indicated with a combination of the supplemental bits that support the periodic resource reservation and bits for time gap signaling.

14. The method of claim 8 , wherein at least one bit of the SCI indicates a codepoint for a non-periodic reservation.

15. An apparatus for wireless communication at a wireless device, comprising:

a memory; and

at least one processor coupled to the memory, the at least one processor and the memory being configured to:

receive sidelink control information (SCI) indicating an aperiodic resource reservation and indicating a time gap between resources for the aperiodic resource reservation based at least in part on supplemental bits that include one or more bits that support information about a periodic resource reservation; and

exclude resources of the aperiodic resource reservation from a set of candidate resources based on the aperiodic resource reservation and the indicated time gap between the aperiodic resource reservations.

16. The apparatus of claim 15 , wherein the memory and the at least one processor are further configured to:

transmit a resource reservation for resources that do not overlap the aperiodic resource reservation indicated in the SCI.

17. The apparatus of claim 15 , wherein the supplemental bits include at least one bit that supports a backward indication of a previous resource for the periodic resource reservation.

18. The apparatus of claim 15 , wherein the supplemental bits include a first number of bits if a resource reservation is for a single reservation per transmission and includes a second number of bits if the resource reservation is for multiple reservations per transmission.

19. The apparatus of claim 15 , wherein the supplemental bits include at least one bit that supports indicating that a resource reservation is periodic.

20. The apparatus of claim 15 , wherein the time gap is indicated with a combination of the supplemental bits and additional bits for time gap signaling.

21. The apparatus of claim 15 , wherein at least one bit of the SCI indicates a codepoint for a non-periodic reservation.

22. A method of wireless communication at a wireless device, comprising:

receiving sidelink control information (SCI) indicating an aperiodic resource reservation and indicating a time gap between resources for the aperiodic resource reservation based at least in part on supplemental bits that include one or more bits that support information about a periodic resource reservation; and

excluding resources of the aperiodic resource reservation from a set of candidate resources based on the aperiodic resource reservation and the indicated time gap between the aperiodic resource reservations.

23. The method of claim 22 , further comprising:

transmitting a resource reservation for resources that do not overlap the aperiodic resource reservation indicated in the SCI.

24. The method of claim 22 , wherein the supplemental bits include at least one bit that supports a backward indication of a previous resource for the periodic resource reservation.

25. The method of claim 22 , wherein the supplemental bits include a first number of bits if a resource reservation is for a single reservation per transmission and includes a second number of bits if the resource reservation is for multiple reservations per transmission.

26. The method of claim 22 , wherein the supplemental bits include at least one bit that supports indicating that the resource reservation is periodic.

27. The method of claim 22 , wherein the time gap is indicated with a combination of the supplemental bits and additional bits for time gap signaling.

28. The method of claim 22 , wherein at least one bit of the SCI indicate a codepoint for a non-periodic reservation.