Reservation techniques for aggregated sidelink communications

1. A method for wireless communications at a user equipment (UE), comprising:

receiving control signaling indicating an aggregated sidelink resource reservation rule for reserving time-contiguous transmission time intervals;

transmitting, based at least in part on the aggregated sidelink resource reservation rule, a sidelink control reservation message indicating a starting transmission time interval for reserving a plurality of time-contiguous transmission time intervals in a sidelink shared channel and a quantity of the plurality of time-contiguous transmission time intervals reserved for transmission of a plurality of aggregated sidelink messages;

transmitting the plurality of aggregated sidelink messages via the plurality of time-contiguous transmission time intervals of the sidelink shared channel indicated in the sidelink control reservation message; and

receiving a second sidelink control reservation message indicating a second starting transmission time interval for reserving a second plurality of time-contiguous transmission time intervals in the sidelink shared channel and a second quantity of the second plurality of time-contiguous transmission time intervals from a second UE based at least in part on the aggregated sidelink resource reservation rule and the sidelink control reservation message.

2. The method of claim 1 , further comprising:

receiving control signaling that indicates a time duration window associated with the sidelink shared channel and an offset for the time duration window.

3. The method of claim 2 , wherein transmitting the sidelink control reservation message comprises:

transmitting the sidelink control reservation message indicating the starting transmission time interval within the time duration window relative to the offset.

4. The method of claim 3 , wherein transmitting the plurality of aggregated sidelink messages comprises:

transmitting the plurality of aggregated sidelink messages within the time duration window relative to the starting transmission time interval.

5. The method of claim 1 , further comprising:

transmitting the sidelink control reservation message that comprises a quantity of bits selected based at least in part on the starting transmission time interval and the quantity of the plurality of time-contiguous transmission time intervals.

6. The method of claim 5 , wherein the quantity of bits is selected based at least in part on the quantity of the plurality of time-contiguous transmission time intervals satisfying a threshold.

7. The method of claim 1 , further comprising:

transmitting a second sidelink control reservation message indicating a first sidelink message of the plurality of aggregated sidelink messages.

8. The method of claim 7 , wherein the sidelink control reservation message comprises an indication that the sidelink control reservation message is associated with the second sidelink control reservation message.

9. The method of claim 7 , wherein the aggregated sidelink resource reservation rule indicates that the sidelink control reservation message is associated with the second sidelink control reservation message.

10. The method of claim 1 , further comprising:

transmitting the sidelink control reservation message that indicates the starting transmission time interval; and

transmitting a second sidelink control reservation message indicating an ending transmission time interval of the plurality of time-contiguous transmission time intervals, wherein a difference between the starting transmission time interval and the ending transmission time interval indicates the quantity of the plurality of time-contiguous transmission time intervals.

11. The method of claim 1 , further comprising:

transmitting the sidelink control reservation message that indicates the starting transmission time interval and the quantity of the plurality of time-contiguous transmission time intervals with respect to a current transmission time interval index in which the sidelink control reservation message is transmitted in a periodic resource.

12. The method of claim 1 , further comprising:

transmitting the sidelink control reservation message that comprises an indication that the starting transmission time interval and the quantity of the plurality of time-contiguous transmission time intervals are respective to a transmission time interval index of one of a periodic resource or a dynamic resource.

13. The method of claim 1 , wherein receiving the control signaling further comprises:

receiving the control signaling indicating the aggregated sidelink resource reservation rule that indicates a rule for calculating the starting transmission time interval, the quantity of the plurality of time-contiguous transmission time intervals, or both, based at least in part on a configured offset, a time duration window, or both.

14. The method of claim 1 , wherein receiving the control signaling further comprises:

receiving the control signaling indicating the aggregated sidelink resource reservation rule that indicates a rule for calculating the starting transmission time interval, the quantity of the plurality of time-contiguous transmission time intervals, or both, based at least in part on a periodic resource pool.

15. A method for wireless communications at a user equipment (UE), comprising:

receiving control signaling indicating an aggregated sidelink resource reservation rule for reserving time-contiguous transmission time intervals;

receiving a sidelink control reservation message indicating a starting transmission time interval for reserving a plurality of time-contiguous transmission time intervals in a sidelink shared channel and a quantity of the plurality of time-contiguous transmission time intervals reserved for transmission of a plurality of aggregated sidelink messages from a second UE based at least in part on the aggregated sidelink resource reservation rule;

transmitting a second sidelink control reservation message indicating a second starting transmission time interval for reserving a second plurality of time-contiguous transmission time intervals in the sidelink shared channel and a second quantity of the second plurality of time-contiguous transmission time intervals reserved for transmission of a second plurality of aggregated sidelink messages based as least in part on the aggregated sidelink resource reservation rule and the sidelink control reservation message; and

transmitting the second plurality of aggregated sidelink messages via the second plurality of time-contiguous transmission time intervals of the sidelink shared channel.

16. The method of claim 15 , further comprising:

receiving control signaling that indicates a time duration window associated with the sidelink shared channel and an offset of the time duration window.

17. The method of claim 16 , wherein transmitting the second sidelink control reservation message comprises:

transmitting the second sidelink control reservation message indicating the second starting transmission time interval within the time duration window relative to the offset.

18. The method of claim 17 , wherein transmitting the second plurality of aggregated sidelink messages comprises:

transmitting the second plurality of aggregated sidelink messages within the time duration window relative to the second starting transmission time interval.

19. The method of claim 15 , further comprising:

transmitting the second sidelink control reservation message that comprises a quantity of bits selected based at least in part on the second starting transmission time interval and the second quantity of the second plurality of time-contiguous transmission time intervals.

20. The method of claim 19 , wherein the quantity of bits is selected based at least in part on the second quantity of the second plurality of time-contiguous transmission time intervals satisfying a threshold.

21. The method of claim 15 , further comprising:

transmitting a third sidelink control reservation message indicating a first sidelink message of the second plurality of aggregated sidelink messages.

22. The method of claim 21 , wherein the second sidelink control reservation message comprises an indication that the second sidelink control reservation message is associated with the third sidelink control reservation message.

23. The method of claim 21 , wherein the aggregated sidelink resource reservation rule indicates that the second sidelink control reservation message is associated with the third sidelink control reservation message.

24. The method of claim 15 , further comprising:

receiving the sidelink control reservation message that indicates the starting transmission time interval; and

receiving a third sidelink control reservation message indicating an ending transmission time interval of the plurality of time-contiguous transmission time intervals, wherein a difference between the starting transmission time interval and the ending transmission time interval indicates the quantity of the plurality of time-contiguous transmission time intervals.

25. The method of claim 15 , further comprising:

transmitting the second sidelink control reservation message that indicates the second starting transmission time interval and the second quantity of the second plurality of time-contiguous transmission time intervals with respect to a current transmission time interval index in which the second sidelink control reservation message is transmitted in a periodic resource.

26. The method of claim 15 , further comprising:

transmitting the second sidelink control reservation message that comprises an indication that the second starting transmission time interval and the second quantity of the second plurality of time-contiguous transmission time intervals are respective to a transmission time interval index of one of a periodic resource or a dynamic resource.

27. The method of claim 15 , wherein receiving the control signaling further comprises:

receiving the control signaling indicating the aggregated sidelink resource reservation rule that indicates a rule for calculating the second starting transmission time interval, the second quantity of the second plurality of time-contiguous transmission time intervals, or both, based at least in part on a configured offset, a time duration window, or both.

28. The method of claim 15 , wherein receiving the control signaling further comprises:

receiving the control signaling indicating the aggregated sidelink resource reservation rule that indicates a rule for calculating the second starting transmission time interval, the second quantity of the second plurality of time-contiguous transmission time intervals, or both, based at least in part on a periodic resource pool.

29. An apparatus for wireless communications 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 control signaling indicating an aggregated sidelink resource reservation rule for reserving time-contiguous transmission time intervals;

transmit, based at least in part on the aggregated sidelink resource reservation rule, a sidelink control reservation message indicating a starting transmission time interval for reserving a plurality of time-contiguous transmission time intervals in a sidelink shared channel and a quantity of the plurality of time-contiguous transmission time intervals reserved for transmission of a plurality of aggregated sidelink messages;

transmit the plurality of aggregated sidelink messages via the plurality of time-contiguous transmission time intervals of the sidelink shared channel indicated in the sidelink control reservation message; and

receive a second sidelink control reservation message indicating a second starting transmission time interval for reserving a second plurality of time-contiguous transmission time intervals in the sidelink shared channel and a second quantity of the second plurality of time-contiguous transmission time intervals from a second UE based at least in part on the aggregated sidelink resource reservation rule and the sidelink control reservation message.

30. An apparatus for wireless communications 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 control signaling indicating an aggregated sidelink resource reservation rule for reserving time-contiguous transmission time intervals;

receive a sidelink control reservation message indicating a starting transmission time interval for reserving a plurality of time-contiguous transmission time intervals in a sidelink shared channel and a quantity of the plurality of time-contiguous transmission time intervals reserved for transmission of a plurality of aggregated sidelink messages from a second UE based at least in part on the aggregated sidelink resource reservation rule;

transmit a second sidelink control reservation message indicating a second starting transmission time interval for reserving a second plurality of time-contiguous transmission time intervals in the sidelink shared channel and a second quantity of the second plurality of time-contiguous transmission time intervals reserved for transmission of a second plurality of aggregated sidelink messages based as least in part on the aggregated sidelink resource reservation rule and the sidelink control reservation message; and

transmit the second plurality of aggregated sidelink messages via the second plurality of time-contiguous transmission time intervals of the sidelink shared channel.