Method and device for controlling duplicate packet transmission in wireless communication system

1. A terminal for controlling packet duplication in a wireless communication system, the terminal comprising:

a transceiver; and

at least one processor coupled to the transceiver and configured to:

receive a duplication activation/deactivation information associated with a plurality of secondary Radio Link Control (RLC) entities for a Data Radio Bearer (DRB) as a format of Medium Access Control (MAC) Control Element (CE); and

in case that the duplication activation/deactivation information associated with the plurality of the secondary RLC entities for the DRB indicates duplication activation of at least one secondary RLC entity from the plurality of the secondary RLC entities for the DRB, duplicate a first Packet Data Convergence Protocol (PDCP) packet for the at least one secondary RLC entity, and deliver the duplicated first PDCP packet to the at least one secondary RLC entity,

wherein the duplication activation/deactivation information associated with the plurality of the secondary RLC entities for the DRB includes an identity of the DRB and a plurality of RLC fields for the DRB, and

wherein the plurality of the RLC fields for the DRB indicate activation or deactivation status of PDCP duplication for the plurality of the secondary RLC entities.

2. The terminal of claim 1 , wherein the at least one processor is further configured to:

transmit, to a base station, capability information indicating whether to support duplication transmission by using more than two RLC entities.

3. The terminal of claim 1 , wherein the at least one processor is further configured to:

receive, from a base station, PDCP configuration information including a duplication field associated with the plurality of the secondary RLC entities via a Radio resource control (RRC) signaling;

identify at least one RLC entity that is used for packet duplication transmission from among the plurality of the secondary RLC entities, based on the duplication field associated with the plurality of the secondary RLC entities; and

duplicate a second PDCP packet for the identified at least one RLC entity, and deliver the duplicated second PDCP packet to the identified at least one RLC entity.

4. The terminal of claim 3 ,

wherein the duplication field associated with the plurality of the secondary RLC entities indicates ‘true’ for a first secondary RLC entity and ‘false’ for a second secondary RLC entity, and

wherein the at least one processor is further configured to:

activate the first secondary RLC entity based on the duplication field associated with the plurality of the secondary RLC entities, and

deactivate the second secondary RLC entity based on the duplication field associated with the plurality of the secondary RLC entities.

5. The terminal of claim 3 , wherein the duplication field associated with the plurality of the secondary RLC entities includes an index determined based on a logical channel identifiers (IDs) of the plurality of the secondary RLC entities.

6. The terminal of claim 1 ,

wherein the plurality of the RLC fields for the DRB are identified by ascending order of logical channel identifiers (IDs) in an order of a master cell group, MCG, and a secondary cell group, SCG.

7. The terminal of claim 1 ,

wherein the plurality of the RLC fields for the DRB include a first RLC field for a first secondary RLC entity, and

wherein the at least one processor is further configured to:

in case that the first RLC field is set to 1 , activate the first secondary RLC entity for PDCP duplication; and

in case that the first RLC field is set to 0 , deactivate the first secondary RLC entity for PDCP duplication.

8. The terminal of claim 1 , wherein a primary RLC entity cannot be deactivated.

9. The terminal of claim 1 , wherein the at least one processor is further configured to:

indicate, by a PDCP entity, a deactivated secondary RLC entity to discard all duplicated PDCP packets.

10. The terminal of claim 1 , wherein the at least one processor is further configured to:

receive, from a base station, logical channel configuration information including information associated with at least one cell used by a logical channel, and

determine not to apply the information associated with the at least one cell used by the logical channel when none or only one of the plurality of the secondary RLC entities remains activated.

11. The terminal of claim 1 , wherein the at least one processor is further configured to:

receive, from a base station, logical channel configuration information including information associated with a cell restriction mapped with a logical channel, and

wherein the cell restriction is not applied when none or only one of the plurality of the secondary RLC entities remains activated in a cell group regardless of the information associated with the cell restriction mapped with the logical channel.

12. A method, performed by a terminal, for controlling packet duplication in a wireless communication system, the method comprising:

receiving a duplication activation/deactivation information associated with a plurality of secondary Radio Link Control (RLC) entities for a Data Radio Bearer (DRB) as a format of Medium Access Control (MAC) Control Element (CE); and

in case that the duplication activation/deactivation information associated with the plurality of the secondary RLC entities for the DRB indicates duplication activation of at least one secondary RLC entity from the plurality of the secondary RLC entities for the DRB, duplicating a first Packet Data Convergence Protocol (PDCP) packet for the at least one secondary RLC entity, and deliver the duplicated first PDCP packet to the at least one secondary RLC entity,

wherein the duplication activation/deactivation information associated with the plurality of the secondary RLC entities for the DRB includes an identity of the DRB and a plurality of RLC fields for the DRB, and

wherein the plurality of the RLC fields for the DRB indicate activation or deactivation status of PDCP duplication for the plurality of the secondary RLC entities.

13. The method of claim 12 , further comprising:

transmitting, to a base station, capability information indicating whether to support duplication transmission by using more than two RLC entities.

14. The method of claim 12 , further comprising:

receiving, from a base station, PDCP configuration information including a duplication field associated with the plurality of the secondary RLC entities via a Radio resource control (RRC) signaling;

identifying at least one RLC entity that is used for packet duplication transmission from among the plurality of the secondary RLC entities, based on the duplication field associated with the plurality of the secondary RLC entities;

duplicating a second PDCP packet for the identified at least one RLC entity; and

delivering the duplicated second PDCP packet to the identified at least one RLC entity.

15. The method of claim 14 ,

wherein the duplication field associated with the plurality of the secondary RLC entities indicates ‘true’ for a first secondary RLC entity and ‘false’ for a second secondary RLC entity, and

wherein the method further comprises:

activating the first secondary RLC entity based on the duplication field associated with the plurality of the secondary RLC entities; and

deactivating the second secondary RLC entity based on the duplication field associated with the plurality of the secondary RLC entities.

16. The method of claim 12 ,

wherein the plurality of the RLC fields for the DRB are identified by ascending order of logical channel identifiers (IDs) in an order of a master cell group, MCG, and a secondary cell group, SCG.

17. The method of claim 12 ,

wherein the plurality of the RLC fields for the DRB includes a first RLC field for a first secondary RLC entity, and

the method further comprising:

in case that the first RLC field is set to 1, activating the first secondary RLC entity for PDCP duplication; and

in case that the first RLC field is set to 0, deactivating the first secondary RLC entity for PDCP duplication.

18. The method of claim 12 , wherein a primary RLC entity cannot be deactivated.

19. The method of claim 12 , further comprising:

receiving, from a base station, logical channel configuration information including information associated with at least one cell used by a logical channel; and

determining not to apply the information associated with the at least one cell used by the logical channel when none or only one of the plurality of the secondary RLC entities remains activated.

20. The method of claim 12 , comprising:

receiving, from a base station, logical channel configuration information including information associated with a cell restriction mapped with a logical channel,

wherein the cell restriction is not applied when none or only one of the plurality of the secondary RLC entities remains activated in a cell group regardless of the information associated with the cell restriction mapped with the logical channel.