Method and apparatus for a sidelink transmission

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

transmitting, to a base station, a request for one or more sidelink transmissions between the UE and one or more destinations;

transmitting, to the base station, information comprising a quality of service of the one or more sidelink transmissions;

receiving scheduling information from the base station, wherein the scheduling information is based on the quality of service of the one or more sidelink transmissions and comprises an indicator indicating a grant for a selected sidelink transmission between a destination among the one or more destinations and the UE, the indicator comprises an index corresponding to the destination, the index is mapped to a UE destination identifier (ID) or a group ID, and the scheduling information further comprises a resource which is scheduled for the UE to transmit data; and

transmitting the data to the destination using the resource scheduled for the UE.

2. The method of claim 1 , wherein the request comprises a list of identifiers of the one or more destinations of the one or more sidelink transmissions.

3. The method of claim 1 , wherein the request comprises a buffer size report of the one or more sidelink transmissions.

4. The method of claim 3 , wherein the buffer size report comprises a destination index, a logical channel group identifier, and a buffer size of each of the one or more sidelink transmissions.

5. The method of claim 1 , wherein the scheduling information is carried in downlink control information.

6. The method of claim 1 , wherein the index is used by the UE to retrieve identifier of the destination.

7. The method of claim 6 , wherein the index is further used by the UE to retrieve identifying information of a session corresponding to the destination, wherein the session is at least one of a unicast session, a groupcast session, and a broadcast session.

8. The method of claim 6 , wherein the identifier of the destination is retrieved by the UE from at least one of:

a list of identifiers of the one or more destinations transmitted in the request, and

a buffer size report transmitted in the request.

9. The method of claim 1 , wherein the resource is a mini-slot for a sidelink transmission.

10. A method performed by a base station, the method comprising:

receiving, from a user equipment (UE), a request for one or more sidelink transmissions between the UE and one or more destinations;

receiving, from the UE, information comprising a quality of service of the one or more sidelink transmissions;

selecting a sidelink transmission from the one or more sidelink transmissions, wherein the selected sidelink transmission is between a destination among the one or more destinations and the UE;

determining scheduling information based on the quality of service of the one or more sidelink transmissions; and

transmitting the scheduling information, wherein the scheduling information comprises an indicator indicating a grant for the selected sidelink transmission, the indicator comprises an index corresponding to the destination, the index is mapped to a UE destination identifier (ID) or a group ID, and the scheduling information further comprises a resource which is scheduled for the UE to transmit data.

11. The method of claim 10 , wherein the request comprises a list of identifiers of the one or more destinations of the one or more sidelink transmissions.

12. The method of claim 10 , wherein the request comprises a buffer size report of the one or more sidelink transmissions.

13. The method of claim 12 , wherein the buffer size report comprises a destination index, a logical channel group identifier, and a buffer size of each of the one or more sidelink transmissions.

14. The method of claim 10 , wherein the scheduling information is carried in downlink control information.

15. The method of claim 10 , wherein the index is used by the UE to retrieve an identifier of the destination.

16. A user equipment (UE), comprising:

at least one memory; and

at least one processor coupled with the at least one memory and configured to cause the UE to:

transmit, to a base station, a request for one or more sidelink transmissions between the UE and one or more destinations;

transmit, to the base station, information comprising a quality of service of the one or more sidelink transmissions;

receive scheduling information from the base station, wherein the scheduling information is based on the quality of service of the one or more sidelink transmissions and comprises an indicator indicating a grant for a selected sidelink transmission between a destination among the one or more destinations and the UE, the indicator comprises an index corresponding to the destination, the index is mapped to a UE destination identifier (ID) or a group ID, and the scheduling information further comprises a resource which is scheduled for the UE to transmit data; and

transmit the data to the destination using the resource scheduled for the UE.

17. A base station, comprising:

at least one memory; and

at least one processor coupled with the at least one memory and configured to cause the base station to:

receive, from a user equipment (UE), a request for one or more sidelink transmissions between the UE and one or more destinations;

receive, from the UE, information comprising a quality of service of the one or more sidelink transmissions;

select a sidelink transmission from the one or more sidelink transmissions, wherein the selected sidelink transmission is between a destination among the one or more destinations and the UE;

determine scheduling information based on the quality of service of the one or more sidelink transmissions; and

transmit the scheduling information, wherein the scheduling information comprises an indicator indicating a grant for the selected sidelink transmission, the indicator comprises an index corresponding to the destination, the index is mapped to a UE destination identifier (ID) or a group ID, and the scheduling information further comprises a resource which is scheduled for the UE to transmit data.