Method and apparatus for handling beam sensing for sidelink resource in a wireless communication system

1. A method for a UE (User Equipment) to perform sidelink transmission, comprising:

the UE performs sensing on a second direction or beam;

the UE receives or detects a control signaling on the second direction or beam from a second UE, wherein the control signaling schedules a transmission of the second UE in a resource pool, and wherein the resource pool comprises one or more time and/or frequency candidate resources;

the UE excludes one or more second time and/or frequency candidate resources associated with the transmission of the second UE, and selects a resource from remaining time and/or frequency candidate resources in the resource pool; and

the UE performs a sidelink transmission on the selected resource on a first direction or beam, which has a different direction than the second direction or beam.

2. The method of claim 1 , further comprising:

the UE performs sensing on the first direction or beam; and

the resource is selected based on at least sensing result of the second direction or beam and the first direction or beam.

3. The method of claim 2 , wherein

the UE receives or detects another control signaling on the first direction or beam from a third UE, wherein the another control signaling schedules another transmission of the third UE in the resource pool; and

the UE excludes one or more first time and/or frequency candidate resources associated with the another transmission, and selects the resource from remaining time and/or frequency candidate resources in the resource pool.

4. The method of claim 2 , wherein the UE performs the sidelink transmission on the selected resource in the resource pool.

5. The method of claim 1 , wherein a relative angular difference between the second direction or beam and the first direction or beam is at least larger than X degrees, wherein X is any of 30, 60, 90, 120, or 150.

6. The method of claim 1 , wherein the second direction or beam comprises the opposite direction of the first direction or beam.

7. The method of claim 1 , wherein an angular width of sensing region on the second direction is the same or wider than an angular width of transmission region on the first direction, and/or an angular width of the second beam is the same or wider than an angular width of the first beam.

8. The method of claim 1 , wherein the UE performs energy sensing on the second direction or beam to derive a metric for each candidate resource respectively, and the UE performs time and/or frequency resource selection with selecting the candidate resources with a smaller metric.

9. The method of claim 1 , wherein the resource is selected based on at least sensing result of the second direction or beam.

10. The method of claim 1 , wherein the one or more second time and/or frequency candidate resources associated with the transmission of the second UE are resource(s) of next scheduled transmission(s) indicated by the control signaling, and/or

wherein reference signal received power of the control signaling is larger than a threshold.

11. A method of a UE (User Equipment) to perform sidelink transmission, comprising:

the UE performs sensing on a second direction or beam and a first direction or beam, wherein the second direction or beam has a different direction than the first direction or beam;

the UE selects a resource in a resource pool based on the sensing result of the second direction or beam and the first direction or beam,

wherein the resource pool comprises one or more time and/or frequency candidate resources, and the UE receives or detects a first control signaling on the first direction or beam from another UE, wherein the first control signaling schedules a first transmission of the another UE in the resource pool, the UE excludes one or more first time and/or frequency candidate resources associated with the first transmission, and

wherein the UE performs energy sensing on the second direction or beam to derive a metric for each candidate resource, and

the UE performs time and/or frequency resource selection with selecting the candidate resources with a smaller metric from remaining time and/or frequency candidate resources in the resource pool after the exclusion; and

the UE performs a sidelink transmission on the resource on the first direction or beam.

12. The method of claim 11 , wherein the second direction or beam comprises the opposite direction of the first direction or beam.

13. The method of claim 11 , wherein an angular width of sensing region on the second direction is the same or wider than an angular width of transmission region on the first direction, and/or an angular width of the second beam is the same or wider than an angular width of the first beam.

14. The method of claim 11 , wherein:

the UE receives or detects a second control signaling on the second direction or beam from a second UE, wherein the second control signaling schedules a second transmission of the second UE in the resource pool; and

the UE excludes one or more second time and/or frequency candidate resources associated with the second transmission in the resource pool.

15. The method of claim 11 , wherein the UE performs the sidelink transmission on the selected resource in the resource pool.

16. A UE (User Equipment), comprising:

a memory; and

a processor operatively coupled with the memory, wherein the processor is configured to execute program code to:

perform sensing on a second direction or beam;

receive or detect a control signaling on the second direction or beam from a second UE, wherein the control signaling schedules a transmission of the second UE in a resource pool, and wherein the resource pool comprises one or more time and/or frequency candidate resources;

exclude one or more second time and/or frequency candidate resources associated with the transmission of the second UE, and selects a resource from remaining time and/or frequency candidate resources in the resource pool; and

perform a sidelink transmission on the selected resource on a first direction or beam, which has a different direction than the second direction or beam.

17. The UE of claim 16 , wherein the processor is further configured to execute program code to:

perform sensing on the first direction or beam; and

select the resource based on at least sensing result of the second direction or beam and the first direction or beam.

18. The UE of claim 17 , wherein

the UE receives or detects another control signaling on the first direction or beam from a third UE, wherein the another control signaling schedules another transmission of the third UE in the resource pool; and

the UE excludes one or more first time and/or frequency candidate resources associated with the another transmission, and selects the resource from the remaining time and/or frequency candidate resources in the resource pool.

19. The UE of claim 16 , wherein the one or more second time and/or frequency candidate resources associated with the transmission of the second UE are resource(s) of next scheduled transmission(s) indicated by the control signaling, and/or

wherein reference signal received power of the control signaling is larger than a threshold.

20. The UE of claim 16 , wherein the second direction or beam comprises the opposite direction of the first direction or beam.