Method and apparatus for selecting resources based on partial sensing in NR V2X

1. A method for performing wireless communication based on partial sensing by a first device, the method comprising:

selecting Y slots including a plurality of sidelink (SL) resources within a selection window;

performing sensing for at least one slot related to the Y slots; and

determining at least one first SL transmission resource based on a resource reservation period and the sensing for the at least one slot,

wherein the first device is allowed to perform a re-evaluation procedure or a pre-emption procedure only for resources not later than a last resource among the plurality of SL resources initially selected within each period, and

wherein a pattern of the Y slots initially selected is used in the re-evaluation procedure or the pre-emption procedure triggered for each period.

2. The method of claim 1 , wherein the first device is not allowed to perform the re-evaluation procedure or the pre-emption procedure for resources after the last resource among the plurality of SL resources initially selected within each period.

3. The method of claim 1 , wherein the at least one slot is at least one slot before the resource reservation period configured for a resource pool from the Y slots or at least one slot before a multiple of the resource reservation period configured for the resource pool from the Y slots.

4. The method of claim 1 , wherein, based on the re-evaluation procedure or the pre-emption procedure being triggered in a first slot within a first period among a plurality of periods, the re-evaluation procedure or the pre-emption procedure is performed after the first slot in the first period and before the last resource among the plurality of SL resources initially selected.

5. The method of claim 1 , wherein, based on the re-evaluation procedure or the pre-emption procedure being triggered in a first slot within a first period among a plurality of periods, a plurality of resources to be subjected to the re-evaluation procedure or the pre-emption procedure are a plurality of resources included in N slots after the first slot among the Y slots initially selected.

6. The method of claim 1 , further comprising:

reselecting the at least one first SL transmission resource as at least one second SL resource after the last resource, based on the re-evaluation procedure or the pre-emption procedure within a first period among a plurality of periods.

7. The method of claim 6 , wherein the first device is allowed to perform the re-evaluation procedure or the pre-emption procedure only for resources not later than the last resource among the plurality of SL resources initially selected within a second period after the first period, regardless of reselection for the at least one first SL transmission resource within the first period.

8. The method of claim 6 , wherein the first device is not allowed to perform the re-evaluation procedure or the pre-emption procedure for resources after the last resource among the plurality of SL resources initially selected within a second period after the first period, regardless of reselection for the at least one first SL transmission resource within the first period.

9. The method of claim 1 , further comprising:

performing continuous partial sensing from a second slot located after a first slot to a third slot, based on the re-evaluation procedure or the pre-emption procedure being triggered in the first slot within a first period among a plurality of periods.

10. The method of claim 9 ,

wherein the second slot is a slot before M slots from a fourth slot located after the first slot among the Y slots initially selected within the first period, and

wherein M is a positive integer.

11. The method of claim 10 , wherein M is 31.

12. The method of claim 9 ,

wherein the third slot is a slot before K slots from the fourth slot located after the first slot among the Y slots initially selected within the first period, and

wherein K is a positive integer.

13. The method of claim 12 , wherein K is a number of slots for processing of the first device.

14. The method of claim 9 ,

wherein a length of a time window for the continuous partial sensing is a value obtained by subtracting a number of slots for processing of the first device from M, and

wherein M is a positive integer.

15. The method of claim 1 , wherein whether it is allowed to perform the re-evaluation procedure or the pre-emption procedure for a resource selected based on random selection is configured for the first device for each resource pool.

16. The method of claim 1 , wherein, in the pre-emption procedure, a pre-emption priority value related to transmission of a device requiring power saving is different from a pre-emption priority value related to transmission of a device not requiring power saving.

17. The method of claim 1 , wherein, based on reselecting the at least one first SL transmission resource as at least one second SL resource not belonging to the Y slots within a first period among a plurality of periods, the pattern of the Y slots initially selected is used in the re-evaluation procedure or the pre-emption procedure triggered for a second period.

18. A first device adapted to perform wireless communication based on partial sensing, the first device comprising:

at least one transceiver;

at least one processor; and

at least one memory connected to the at least one processor and storing instructions that, based on being executed, cause the first device to perform operations comprising:

selecting Y slots including a plurality of sidelink (SL) resources within a selection window;

performing sensing for at least one slot related to the Y slots; and

determining at least one first SL transmission resource based on a resource reservation period and the sensing for the at least one slot,

wherein the first device is allowed to perform a re-evaluation procedure or a pre-emption procedure only for resources not later than a last resource among the plurality of SL resources initially selected within each period, and

wherein a pattern of the Y slots initially selected is used in the re-evaluation procedure or the pre-emption procedure triggered for each period.

19. A processing device adapted to control a first device performing wireless communication based on partial sensing, the processing device comprising:

at least one processor; and

at least one memory connected to the at least one processor and storing instructions that, based on being executed, cause the first device to perform operations comprising:

selecting Y slots including a plurality of sidelink (SL) resources within a selection window;

performing sensing for at least one slot related to the Y slots; and

determining at least one first SL transmission resource based on a resource reservation period and the sensing for the at least one slot,

wherein the first UE is allowed to perform a re-evaluation procedure or a pre-emption procedure only for resources not later than a last resource among the plurality of SL resources initially selected within each period, and

wherein a pattern of the Y slots initially selected is used in the re-evaluation procedure or the pre-emption procedure triggered for each period.