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

1. A method for performing wireless communication by a device, the method comprising:

triggering resource selection in a slot; and

based on the triggering:

determining a time interval of a selection window from the slot based on a remaining packet delay budget (PDB),

wherein the selection window includes Y candidate slots;

performing partial sensing of slots related to the selection window;

selecting at least one resource for sidelink (SL) transmission within the selection window;

transmitting, to a second device through a physical sidelink control channel (PSCCH), a first sidelink control information (SCI) for scheduling of a physical sidelink shared channel (PSSCH) and a second SCI; and

transmitting, to the second device through the PSSCH, the second SCI and data;

wherein, based on a number of slots, L, from the slot and before a first slot of the Y candidate slots of the selection window being smaller than a predetermined minimum number of slots configured for the partial sensing, the selecting the at least one resource comprises:

a) randomly selecting the at least one resource within the selection window, or

b) selecting the at least one resource within the Y candidate slots based on the sensing for the L slots from the slot and before the first slot of the Y candidate slots of the selection window,

wherein the Y is a positive integer, and

wherein the L is a positive integer.

2. The method of claim 1 ,

wherein the L slots are L slots belonging to a resource pool, located from the slot in which the resource selection is triggered.

3. The method of claim 2 ,

wherein a number of slots belonging to the resource pool between the slot and the first slot of the Y candidate slots of the selection window is smaller than the predetermined minimum number of slots.

4. The method of claim 1 ,

wherein the first slot of the Y candidate slots is located after a first processing time and a second processing time from a last slot of the L slots.

5. The method of claim 4 ,

wherein the first processing time is a time required for the first device to process a result of the sensing, and

wherein the second processing time is a time required for the first device to select the at least one resource based on the result of the sensing.

6. The method of claim 1 , further comprising:

obtaining an SL discontinuous reception (DRX) configuration including information related to an active time of the second device.

7. The method of claim 6 ,

wherein the at least one resource includes at least one first resource selected within the active time and at least one second resource selected outside the active time.

8. The method of claim 7 ,

wherein a ratio between a number of the at least one first resource and a number of the at least one second resource is configured for the first device.

9. The method of claim 7 ,

wherein a minimum number of the at least one first resource or a number of the at least one second resource is configured for the first device.

10. The method of claim 1 ,

wherein a minimum number of the Y candidate slots is configured for the first device.

11. The method of claim 1 ,

wherein, based on the L being greater than or equal to the predetermined minimum number of slots for the sensing, the selecting the at least one resource comprises selecting the at least one resource based on the sensing for the L slots from the slot and before the first slot of the Y candidate slots of the selection window, and

wherein the Y candidate slots are selected by the first device so that the L is greater than or equal to the predetermined minimum number of slots for the sensing.

12. The method of claim 1 ,

wherein the predetermined minimum number of slots is configured for the first device.

13. The method of claim 1 ,

wherein the predetermined minimum number of slots is configured for the first device through a resource pool configuration.

14. The method of claim 1 , wherein the first slot of the Y candidate slots of the selection window is a first occurring slot of the Y candidate slots of the selection window.

15. A first device configured to perform wireless communication, the first device comprising:

one or more memories storing instructions;

one or more transceivers; and

one or more processors connected to the one or more memories and the one or more transceivers, wherein the one or more processors execute the instructions to:

trigger resource selection in a slot; and

based on the trigger:

determine a time interval of a selection window from the slot based on a remaining packet delay budget (PDB),

wherein the selection window includes Y candidate slots;

perform partial sensing of slots related to the selection window;

select at least one resource for sidelink (SL) transmission within the selection window;

transmit, to a second device through a physical sidelink control channel (PSCCH), a first sidelink control information (SCI) for scheduling of a physical sidelink shared channel (PSSCH) and a second SCI; and

transmit, to the second device through the PSSCH, the second SCI and data;

wherein, based on a number of slots, L, from the slot and before a first slot of the Y candidate slots of the selection window being smaller than a predetermined minimum number of slots configured for the partial sensing, the at least one resource is:

randomly selected within the selection window, or

selected within the Y candidate slots based on the sensing for the L slots from the slot and before the first slot of the Y candidate slots of the selection window,

wherein the Y is a positive integer, and

wherein the L is a positive integer.

16. The first device of claim 15 ,

wherein the L slots are L slots belonging to a resource pool, located from the slot in which the resource selection is triggered.

17. The first device of claim 16 ,

wherein a number of slots belonging to the resource pool between the slot and the first slot of the Y candidate slots of the selection window is smaller than the predetermined minimum number of slots.

18. The first device of claim 15 ,

wherein a first slot of the Y candidate slots is located after a first processing time and a second processing time from a last slot of the L slots.

19. The first device of claim 18 ,

wherein the first processing time is a time required for the first device to process a result of the sensing, and

wherein the second processing time is a time required for the first device to select the at least one resource based on the result of the sensing.

20. The first device of claim 15 ,

wherein a minimum number of the Y candidate slots is configured for the first device.

21. The first device of claim 15 , wherein the first slot of the Y candidate slots of the selection window is a first occurring slot of the Y candidate slots of the selection window.

22. A processing device configured to control a first device performing wireless communication, the processing device comprising:

one or more processors; and

one or more memories operably connected to the one or more processors and storing instructions, wherein the one or more processors execute the instructions to:

trigger resource selection in a slot; and

based on the trigger:

determine a time interval of a selection window from the slot based on a remaining packet delay budget (PDB),

wherein the selection window includes Y candidate slots;

perform partial sensing of slots related to the selection window;

select at least one resource for sidelink (SL) transmission within the selection window;

transmit, to a second device through a physical sidelink control channel (PSCCH), a first sidelink control information (SCI) for scheduling of a physical sidelink shared channel (PSSCH) and a second SCI; and

transmit, to the second device through the PSSCH, the second SCI and data;

wherein, based on a number of slots, L, from the slot and before a first slot of the Y candidate slots of the selection window being smaller than a predetermined minimum number of slots configured for the partial sensing, the at least one resource is:

randomly selected within the selection window, or

selected within the Y candidate slots based on the sensing for the L slots from the slot and before the first slot of the Y candidate slots of the selection window,

wherein the Y is a positive integer, and

wherein the L is a positive integer.

23. The processing device of claim 22 , wherein the first slot of the Y candidate slots of the selection window is a first occurring slot of the Y candidate slots of the selection window.