Systems, devices, and methods for packet data convergence protocol packet data unit duplication

1. A first base station (BS) in a secondary cell group (SCG) associated with a user equipment (UE), the first BS comprising:

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

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, from a second BS in a master cell group (MCG) associated with the UE, a request for a configuration for packet data convergence protocol (PDCP) data duplication;

generate a mapping configuration for the PDCP data duplication in the SCG after receiving the request; and

transmit, to the UE, the mapping configuration.

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

configure, based on the mapping configuration, a set of allowed serving cells in the SCG for receiving one or more duplicated PDCP packets, the set of allowed serving cells including at least one primary secondary cell (PSCell) and one or more secondary cells (SCells) of the SCG.

3. The first BS of claim 2 , wherein the mapping configuration provides mapping rules between a set of logical channels and the set of allowed serving cells.

4. The first BS of claim 2 , wherein the mapping configuration provides a set of serving cell indices corresponding to the set of allowed serving cells for receiving the one or more duplicated PDCP packets.

5. The first BS of claim 4 , wherein a serving cell index in the set of serving cell indices that has a value of zero is mapped to the PSCell in the SCG that corresponds to at least one logical channel through which the UE is allowed to deliver the one or more duplicated PDCP packets.

6. The first BS of claim 1 , wherein the mapping configuration for the PDCP data duplication includes information of at least one physical radio resource block on a set of allowed serving cells for receiving one or more duplicated PDCP packets from the UE.

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

transmit, to the UE, a PDCP data duplication activation message to activate at least one logical channel corresponding to at least one radio bearer of the UE to deliver one or more duplicated PDCP packets.

8. The first BS of claim 7 , wherein the at least one processor is further configured to execute the computer-executable instructions to:

receive, from the UE, the one or more duplicated PDCP packets in the at least one logical channel corresponding to the at least one radio bearer of the UE.

9. The first BS of claim 1 , the at least one processor is further configured to execute the computer-executable instructions to:

transmit, to the UE, a PDCP data duplication deactivation message to stop the UE from applying one or more allowed serving cells in the SCG to the at least one logical channel.

10. The first BS of claim 1 , wherein the second BS further transmits, to the UE, a second mapping configuration for PDCP data duplication in the MCG.

11. A method performed by a first base station (BS) in a secondary cell group (SCG) associated with a user equipment (UE), the method comprising:

receiving, from a second BS in a master cell group (MCG) associated with the UE, a request for a configuration for packet data convergence protocol (PDCP) data duplication;

generating a mapping configuration for the PDCP data duplication in the SCG after receiving the request; and

transmitting, to the UE, the mapping configuration.

12. The method of claim 11 , further comprising:

configuring, based on the mapping configuration, a set of allowed serving cells in the SCG for receiving one or more duplicated PDCP packets, the set of allowed serving cells including at least one primary secondary cell (PSCell) and one or more secondary cells (SCells) of the SCG.

13. The method of claim 12 , wherein the mapping configuration provides mapping rules between a set of logical channels and the set of allowed serving cells.

14. The method of claim 12 , wherein the mapping configuration provides a set of serving cell indices corresponding to the set of allowed serving cells for receiving the one or more duplicated PDCP packets.

15. The method of claim 14 , wherein a serving cell index in the set of serving cell indices that has a value of zero is mapped to the PSCell in the SCG that corresponds to at least one logical channel through which the UE is allowed to deliver the one or more duplicated PDCP packets.

16. The method of claim 11 , wherein the mapping configuration for the PDCP data duplication includes information of at least one physical radio resource block on a set of allowed serving cells for receiving one or more duplicated PDCP packets from the UE.

17. The method of claim 11 , further comprising:

transmitting, to the UE, a PDCP data duplication activation message to activate at least one logical channel corresponding to at least one radio bearer of the UE to deliver one or more duplicated PDCP packets.

18. The method of claim 17 , further comprising:

receiving, from the UE, the one or more duplicated PDCP packets in the at least one logical channel corresponding to the at least one radio bearer of the UE.

19. The method of claim 11 , further comprising:

transmitting, to the UE, a PDCP data duplication deactivation message to stop the UE from applying one or more allowed serving cells in the SCG to the at least one logical channel.

20. The method of claim 11 , wherein the second BS further transmits, to the UE, a second mapping configuration for PDCP data duplication in the MCG.