Method and apparatus for controlling activation of RLC layers in wireless communication system
Provided is a method of performing communication by using a plurality of Radio Link Control (RLC) entities in a wireless communication system, the method including: receiving a packet duplication configuration for a radio bearer from a base station (BS) via a Radio Resource Control (RRC) message; configuring a plurality of RLC entities including one primary RLC entity and one or more secondary RLC entities which correspond to a preset Packet Data Convergence Protocol (PDCP) entity, based on the packet duplication configuration; and receiving a Medium Access Control Control Element (MAC CE) for controlling activation or deactivation of the one or more secondary RLC entities from among the plurality of configured RLC entities.
1. A method, performed by a user equipment (UE), the method comprising:
receiving, from a base station (BS), a first message configuring a Packet Data Convergence Protocol (PDCP) duplication for a radio bearer;
configuring a primary Radio Link Control (RLC) entity and one or more secondary RLC entities for the PDCP duplication; and
receiving, from the BS, a second message related to a deactivation of the PDCP duplication;
in case that the PDCP duplication is deactivated for the radio bearer, identifying whether a split secondary RLC entity is configured among the one or more secondary RLC entities; and
in case that the split secondary RLC entity is configured, transmitting a PDCP Protocol Data Unit (PDU) based on either the primary RLC entity or the split secondary RLC entity.
2. The method of claim 1 , wherein the first message includes information indicating a Logical Channel Identifier (LCID) of the split secondary RLC entity for fallback to a split bearer operation.
3. The method of claim 1 , wherein the primary RLC entity is associated with a first cell group and the split secondary RLC entity is associated with a second cell group different than the first cell group.
4. The method of claim 1 , wherein the primary RLC entity is not deactivated and all of the one or more secondary RLC entities are deactivated.
5. The method of claim 1 , further comprising:
discarding one or more duplicated PDCP PDUs in the one or more secondary RLC entities.
6. A method performed by a base station (BS), the method comprising:
transmitting, to a user equipment (UE), a first message configuring a Packet Data Convergence Protocol (PDCP) duplication for a radio bearer, wherein the first message is associated with a primary Radio Link Control (RLC) entity and one or more secondary RLC entities being configured for the PDCP duplication in the UE;
transmitting, to the UE, a second message related to a deactivation of the PDCP duplication; and
in case that the PDCP duplication is deactivated for the radio bearer and a split secondary RLC entity is configured among the one or more secondary RLC entities, receiving, from the UE, a PDCP Protocol Data Unit (PDU) which is transmitted based on either the primary RLC entity or the split secondary RLC entity.
7. The method of claim 6 , wherein the first message includes information indicating a Logical Channel Identifier (LCID) of the split secondary RLC entity for fallback to a split bearer operation.
8. The method of claim 6 , wherein the primary RLC entity is associated with a first cell group and the split secondary RLC entity is associated with a second cell group different than the first cell group.
9. The method of claim 6 , wherein the primary RLC entity is not deactivated and all of the one or more secondary RLC entities are deactivated.
10. The method of claim 6 , wherein one or more duplicated PDCP PDUs in the one or more secondary RLC entities are discarded.
11. A user equipment (UE) in a wireless communication system, the UE comprising:
a transceiver; and
a controller configured to:
receive, from a base station (BS) via the transceiver, a first message configuring a Packet Data Convergence Protocol (PDCP) duplication for a radio bearer,
configure a primary Radio Link Control (RLC) entity and one or more secondary RLC entities for the PDCP duplication, and
receive, from the BS via the transceiver, a second message related to a deactivation of the PDCP duplication,
in case that the PDCP duplication is deactivated for the radio bearer, identifying whether a split secondary RLC entity is configured among the one or more secondary RLC entities, and
in case that the split secondary RLC entity is configured, transmitting a PDCP Protocol Data Unit (PDU) based on either the primary RLC entity or the split secondary RLC entity.
12. The UE of claim 11 , wherein the first message includes information indicating a Logical Channel Identifier (LCID) of the split secondary RLC entity for fallback to a split bearer operation.
13. The UE of claim 11 , wherein the primary RLC entity is associated with a first cell group and the split secondary RLC entity is associated with a second cell group different than the first cell group.
14. The UE of claim 11 , wherein the primary RLC entity is not deactivated and all of the one or more secondary RLC entities are deactivated.
15. The UE of claim 11 , wherein the controller is further configured to:
discard one or more duplicated PDCP PDUs in the one or more secondary RLC entities.
16. A base station (BS) in a wireless communication system, the BS comprising:
a transceiver; and
a controller configured to:
transmit, to a user equipment (UE) via the transceiver, a first message configuring a Packet Data Convergence Protocol (PDCP) duplication for a radio bearer, wherein the first message is associated with a primary Radio Link Control (RLC) entity and one or more secondary RLC entities being configured for the PDCP duplication in the UE,
transmit, to the UE via the transceiver, a second message related to a deactivation of the PDCP duplication, and
in case that the PDCP duplication is deactivated for the radio bearer and a split secondary RLC entity is configured among the one or more secondary RLC entities, receive, from the UE via the transceiver, a PDCP Protocol Data Unit (PDU) which is transmitted based on either the primary RLC entity or the split secondary RLC entity.
17. The BS of claim 16 , wherein the first message includes information indicating a Logical Channel Identifier (LCID) of the split secondary RLC entity for fallback to a split bearer operation.
18. The BS of claim 16 , wherein the primary RLC entity is associated with a first cell group and the split secondary RLC entity is associated with a second cell group different than the first cell group.
19. The BS of claim 16 , wherein the primary RLC entity is not deactivated and all of the one or more secondary RLC entities are deactivated.
20. The BS of claim 16 , wherein one or more duplicated PDCP PDUs in the one or more secondary RLC entities are discarded.