Method and apparatus for sidelink communication managements

1. A method of wireless communications performed by a user equipment (UE), the method comprising:

performing a first Medium Access Control (MAC) procedure on a first radio access interface for a first Sidelink (SL) connection, which is on a second radio access interface, between the UE and a target UE of a first destination; and

releasing or canceling the first MAC procedure in a case that the UE is indicated to perform an MAC reset operation associated with the first SL connection based on at least one triggering event associated with the target UE and the second radio access interface,

wherein the first radio access interface is one of a New Radio (NR) Uu interface or an Evolved Universal Terrestrial Radio Access (E-UTRA) Uu interface associated with at least one serving cell, and the second radio access interface is one of an NR PC5 interface or an E-UTRA PC5 interface.

2. The method of claim 1 , wherein the MAC reset operation associated with the first SL connection is indicated by a Radio Resource Control (RRC) entity of the UE, and the at least one triggering event comprises at least one of:

receiving, by the RRC entity of the UE, a message indicating an SL specific reset instruction from the target UE; or

determining, by the RRC entity of the UE, that an SL Radio Link Failure (RLF) event associated with the first destination has been detected on the second radio access interface.

3. The method of claim 1 , wherein the first MAC procedure comprises at least a Buffer Status Report (BSR) procedure associated with the first SL connection between the UE and the target UE.

4. The method of claim 1 , wherein the first MAC procedure comprises at least a Scheduling Request (SR) procedure associated with the first SL connection between the UE and the target UE.

5. The method of claim 1 , further comprising:

performing a second MAC procedure on the first radio access interface for a second SL connection, which is on the second radio access interface, between the UE and a second target UE of a second destination; and

maintaining the second MAC procedure in a case that the UE is indicated to perform the MAC reset operation associated with the first SL connection based on the at least one triggering event associated with the target UE and the second radio access interface.

6. The method of claim 5 , wherein the second MAC procedure comprises at least a Buffer Status Report (BSR) procedure associated with both the first SL connection between the UE and the target UE and the second SL connection between the UE and the second target UE.

7. The method of claim 5 , wherein the second MAC procedure comprises at least a Scheduling Request (SR) procedure associated with both the first SL connection between the UE and the target UE and the second SL connection between the UE and the second target UE.

8. A user equipment (UE) for performing wireless communications, the UE comprising:

one or more non-transitory computer-readable media storing one or more computer-executable instructions; and

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

perform a first Medium Access Control (MAC) procedure on a first radio access interface for a first Sidelink (SL) connection, which is on a second radio access interface, between the UE and a target UE of a first destination; and

release or cancel the first MAC procedure in a case that the UE is indicated to perform an MAC reset operation associated with the first SL connection based on at least one triggering event associated with the target UE and the second radio access interface,

wherein the first radio access interface is one of a New Radio (NR) Uu interface or an Evolved Universal Terrestrial Radio Access (E-UTRA) Uu interface associated with at least one serving cell, and the second radio access interface is one of an NR PC5 interface or an E-UTRA PC5 interface.

9. The UE of claim 8 , wherein the MAC reset operation associated with the first SL connection is indicated by a Radio Resource Control (RRC) entity of the UE, and the at least one triggering event comprises at least one of:

receiving, by the RRC entity of the UE, a message indicating an SL specific reset instruction from the target UE; or

determining, by the RRC entity of the UE, that an SL Radio Link Failure (RLF) event associated with the first destination has been detected on the second radio access interface.

10. The UE of claim 8 , wherein the first MAC procedure comprises at least a Buffer Status Report (BSR) procedure associated with the first SL connection between the UE and the target UE.

11. The UE of claim 8 , wherein the first MAC procedure comprises at least a Scheduling Request (SR) procedure associated with the first SL connection between the UE and the target UE.

12. The UE of claim 8 , wherein the at least one processor is further configured to execute the one or more computer-executable instructions to:

perform a second MAC procedure on the first radio access interface for a second SL connection, which is on a second radio access interface, between the UE and a second target UE of a second destination on the second radio access interface; and

maintain the second MAC procedure in a case that the UE is indicated to perform the MAC reset operation associated with the first SL connection based on the at least one triggering event associated with the target UE and the second radio access interface.

13. The UE of claim 12 , wherein the second MAC procedure comprises at least a Buffer Status Report (BSR) procedure associated with both the first SL connection between the UE and the target UE and the second SL connection between the UE and the second target UE.

14. The UE of claim 12 , wherein the second MAC procedure comprises at least a Scheduling Request (SR) procedure associated with both the first SL connection between the UE and the target UE and the second SL connection between the UE and the second target UE.