Methods and apparatuses for SL carrier aggregation enhancement

1. A user equipment (UE), comprising:

one or more non-transitory computer-readable media having computer-executable instructions embodied thereon;

at least one processor coupled to the one or more non-transitory computer-readable media, and configured to execute the computer-executable instructions to:

receive, through a serving cell of a first Radio Access Technology (RAT), a sidelink resource configuration of a second RAT;

determine first validity area information associated with the first RAT and second validity area information associated with the second RAT, the first validity area information and the second validity area information being associated with different frequency carriers;

identify a validity area of the sidelink resource configuration based on the first validity area information and the second validity area information.

2. The UE of claim 1 , wherein the at least one processor is further configured to execute the computer-executable instructions to:

access a sidelink resource associated with the validity area after the validity area is identified as valid.

3. The UE of claim 1 , wherein the first validity area information is associated with a first Public Land Mobile Network (PLMN) identity (PLMNidentity) in a PLMNidentity list or a first Non-Public Network (NPN) identity (NPNidentity) in a NPNidentity list, wherein the PLMNidentity list and the NPNidentity list are broadcast by the serving cell.

4. The UE of claim 1 , wherein the second validity area information is associated with at least one of one or more SL transmission resource pools, one or more SL reception resource pools, and one or more exceptional transmission resource pools.

5. The UE of claim 1 , wherein the first RAT is a 5 th Generation New Radio (5G NR) RAT.

6. The UE of claim 1 , wherein the sidelink resource configuration of the second RAT is for Long Term Evolution (LTE) Vehicle to Everything (V2X) sidelink communication associated with an Evolved Universal Terrestrial Radio Access (E-UTRA) RAT.

7. The UE of claim 1 , wherein the sidelink resource configuration of the second RAT is received through system information broadcast by the serving cell of the first RAT.

8. The UE of claim 1 , wherein the validity area of the sidelink resource configuration is composed of at least one system information area identifier (systemInformationAreaID) broadcast by the serving cell of the first RAT.

9. The UE of claim 8 , wherein a first validity area of the first RAT is composed by the cell identity of the serving cell of the first RAT, when the sidelink resource configuration is not indicated by the systemInformationAreaID broadcast by the serving cell or the systemInformationAreaID is absent from the system information broadcast by the serving cell.

10. The UE of claim 1 , wherein the sidelink resource configuration associated with the validity area is invalidated by the UE after the UE moves out of either a first validity area associated with the first validity area information or a second validity area associated with the second validity area information.

11. A method by a user equipment (UE), the method comprising:

receiving, through a serving cell of a first Radio Access Technology (RAT), a sidelink resource configuration of a second RAT;

determining first validity area information associated with the first RAT and second validity area information associated with the second RAT, the first validity area information and the second validity area information being associated with different frequency carriers;

identifying a validity area of the sidelink resource configuration based on the first validity area information and the second validity area information.

12. The method of claim 11 , further comprising:

accessing a sidelink resource associated with the validity area after the validity area is identified as valid.

13. The method of claim 11 , wherein the first validity area information is associated with a first Public Land Mobile Network (PLMN) identity (PLMNidentity) in a PLMNidentity list or a first Non-Public Network (NPN) identity (NPNidentity) in a NPNidentity list, wherein the PLMNidentity list and the NPNidentity list are broadcast by the serving cell.

14. The method of claim 11 , wherein the second validity area information is associated with at least one of one or more SL transmission resource pools, one or more SL reception resource pools, and one or more exceptional transmission resource pools.

15. The method of claim 11 , wherein the first RAT is a 5 th Generation New Radio (5G NR) RAT.

16. The method of claim 11 , the sidelink resource configuration of the second RAT is for Long Term Evolution (LTE) Vehicle to Everything (V2X) sidelink communication associated with an Evolved Universal Terrestrial Radio Access (E-UTRA) RAT.

17. The method of claim 11 , wherein the sidelink resource configuration of the second RAT is received through system information broadcast by the serving cell of the first RAT.

18. The method of claim 11 , wherein the validity area of the sidelink resource configuration is composed of at least one system information area identifier (systemInformationAreaID) broadcast by the serving cell of the first RAT.

19. The method of claim 18 , wherein a first validity area of the first RAT is composed by the cell identity of the serving cell of the first RAT, when the sidelink resource configuration is not indicated by the systemInformationAreaID broadcast by the serving cell or the systemInformationAreaID is absent from the system information broadcast by the serving cell.

20. The method of claim 11 , wherein the sidelink resource configuration associated with the validity area is invalidated by the UE after the UE moves out of either a first validity area associated with the first validity area information or a second validity area associated with the second validity area information.