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

1. A method of a User Equipment (UE), the method comprising:

receiving a control signaling which schedules a resource of a first transmission, wherein the control signaling informs and/or indicates that the scheduled resource is not kept for a next transmission;

performing energy sensing for candidate resources, wherein one or more resources associated with the scheduled resource of the first transmission is not utilized for energy sensing;

receiving a second control signaling which schedules a resource of a second transmission, wherein the second control signaling informs and/or indicates that the scheduled resource of the second transmission is a periodic transmission; and

excluding a candidate resource associated with the scheduled resource of the second transmission, wherein one or more resources associated with the scheduled resource of the second transmission is not utilized for energy sensing.

2. The method of claim 1 , further comprising:

performing energy sensing on one or more resources associated with the candidate resources, wherein the one or more resources not excluded by the control signaling are utilized for energy sensing.

3. The method of claim 1 , wherein the one or more resources associated with the scheduled resource of the first transmission not utilized for energy sensing further comprises previous resource or resources associated with the scheduled resource of the first transmission and/or the resource of the first transmission, and wherein the previous resource or resources associated with the scheduled resource of the first transmission means the resource or resources before the scheduled resource of the first transmission have the same frequency resources as the scheduled resource of the first transmission, and include the time difference on one or multiple times of a time period from the scheduled resource of the first transmission.

4. The method of claim 3 , wherein the time period is indicated and/or derived based on a previous control signaling which schedules the previous resource when there is a previous resource of a previous transmission before the scheduled resource of the first transmission and the previous resource is associated with the scheduled resource of the first transmission.

5. The method of claim 1 , wherein the one or more resources associated with the scheduled resource of the second transmission not utilized for energy sensing further comprises the previous resource or resources associated with the scheduled resource of the second transmission and/or the resource of the second transmission, and the previous resource or resources associated with the scheduled resource of the second transmission means the resource or resources before the scheduled resource of the second transmission have the same frequency resources as the scheduled resource of the second transmission, and include the time difference on one or multiple times of a time period from the scheduled resource of the second transmission.

6. The method of claim 1 , wherein an energy sensing result of the one or more resources associated with the scheduled resource of the first transmission and/or the previous resource or resources associated with the scheduled resource of the first transmission is set as zero.

7. The method of claim 1 , wherein a latter resource or resources associated with the scheduled resource of the first transmission is utilized for energy sensing, wherein the latter resource or resources associated with the scheduled resource of the first transmission means the resource or resources after the scheduled resource of the first transmission have the same frequency resources as the scheduled resource of the first transmission, and include the time difference on one or multiple times of a time period from the scheduled resource of the first transmission.

8. The method of claim 1 , wherein the control signaling informs and/or indicates that the scheduled resource is not kept for the next transmission means that the scheduled transmission is not a periodic transmission.

9. The method of claim 1 , wherein the energy sensing means that the UE performs a Received Signal Strength Indicator (RSSI) measurement.

10. A method of a User Equipment (UE), the method comprising:

receiving a signaling that indicates a candidate resource is clear, wherein the signaling is a control signaling which schedules a resource of a first transmission and informs and/or indicates that the scheduled resource is not kept for the next transmission, and the indicated candidate resource is a candidate resource which is associated with the resource of the first transmission;

performing energy sensing for candidate resources;

selecting valid resources from the candidate resources based on an energy sensing result of one or more candidate resources, wherein the indicated candidate resource is considered a valid resource;

performing a transmission on at least one of the valid resources;

receiving a second control signaling which schedules a resource of a second transmission, wherein the second control signaling informs and/or indicates that the scheduled resource of the second transmission is a periodic transmission; and

excluding a candidate resource associated with the scheduled resource of the second transmission, wherein one or more resources associated with the scheduled resource of the second transmission is not utilized for energy sensing.

11. The method of claim 10 , wherein performing energy sensing for candidate resources does not include the indicated candidate resource.

12. The method of claim 10 , wherein the signaling is a control signaling which schedules a resource of a first transmission and informs and/or indicates that the scheduled first transmission is not a periodic transmission, and the indicated candidate resource is a candidate resource which is associated with the resource of the first transmission.

13. The method of claim 10 , wherein the indicated candidate resource further comprises a frequency resource of the scheduled first transmission, and the indicated candidate resource include the time difference on one or multiple times of a time period from the resource of the scheduled first transmission.

14. The method of claim 10 , wherein performing energy sensing for candidate resources means to derive a metric for the candidate resources, and wherein the metric of the indicated candidate resource is set as a specific value.

15. The method of claim 14 , wherein the specific value is zero or the smallest value among the derived metrics for the candidate resources.