Method and apparatus for performing handover in wireless communication system
A method, performed by a terminal, in a wireless communication system is provided. The method includes receiving, from a source base station, a radio resource control (RRC) reconfiguration message including data radio bearer (DRB) configuration information, wherein the DRB configuration information includes an identifier of a DRB and an indicator for a dual active protocol stack (DAPS) handover, and in case that the DRB configuration information includes service data adaptation protocol (SDAP) configuration information, and completion of a random access to a target base station is indicated by a target medium access control (MAC) entity for the target base station, reconfiguring a SDAP entity based on the SDAP configuration information.
1. A method performed by a terminal in a wireless communication system, the method comprising:
receiving, from a source base station, a control message for a handover, the control message including information indicating that a data radio bearer (DRB) is configured for a dual active protocol stack (DAPS) handover; and
in case that an uplink data switching is requested from an upper layer, indicating, by a packet data convergence protocol (PDCP) entity for the DRB, a PDCP data volume excluding a PDCP Control protocol data unit (PDU) associated with the source base station, to a medium access control (MAC) entity for a target base station and indicating, by the PDCP entity for the DRB, a PDCP data volume of the PDCP Control PDU associated with the source base station, to a MAC entity for the source base station.
2. The method of claim 1 , wherein the PDCP Control PDU associated with the source base station includes an interspersed robust header compression (ROHC) feedback associated with the source base station.
3. The method of claim 1 , further comprising:
in case that the uplink data switching is not requested from the upper layer, indicating, by the PDCP entity for the DRB, a PDCP data volume, to the MAC entity for the source base station.
4. The method of claim 1 , wherein a PDCP duplication is deactivated for the DRB.
5. The method of claim 1 , further comprising:
triggering, by the MAC entity for the target base station, a buffer status reporting (BSR) based on the PDCP data volume excluding the PDCP Control PDU associated with the source base station.
6. The method of claim 1 , further comprising:
triggering, by the MAC entity for the source base station, a buffer status reporting (BSR) based on the PDCP data volume of the PDCP Control PDU associated with the source base station.
7. The method of claim 1 , wherein the uplink data switching is requested from the upper layer when a random access procedure is successfully performed on the target base station.
8. A terminal in a wireless communication system, the terminal comprising:
a transceiver; and
at least one processor configured to:
receive via the transceiver, from a source base station, a control message for a handover, the control message including information indicating that a data radio bearer (DRB) is configured for a dual active protocol stack (DAPS) handover, and
in case that an uplink data switching is requested from an upper layer, indicate, by a packet data convergence protocol (PDCP) entity for the DRB, a PDCP data volume excluding a PDCP Control protocol data unit (PDU) associated with the source base station, to a medium access control (MAC) entity for a target base station and indicate, by the PDCP entity for the DRB, a PDCP data volume of the PDCP Control PDU associated with the source base station, to a MAC entity for the source base station.
9. The terminal of claim 8 , wherein the PDCP Control PDU associated with the source base station includes an interspersed robust header compression (ROHC) feedback associated with the source base station.
10. The terminal of claim 8 , wherein the processor is further configured to:
in case that the uplink data switching is not requested from the upper layer, indicate, by the PDCP entity for the DRB, a PDCP data volume, to the MAC entity for the source base station.
11. The terminal of claim 8 , wherein a PDCP duplication is deactivated for the DRB.
12. The terminal of claim 8 , wherein the processor is further configured to:
trigger, by the MAC entity for the target base station, a buffer status reporting (BSR) based on the PDCP data volume excluding the PDCP Control PDU associated with the source base station.
13. The terminal of claim 8 , wherein the processor is further configured to:
trigger, by the MAC entity for the source base station, a buffer status reporting (BSR) based on the PDCP data volume of the PDCP Control PDU associated with the source base station.
14. The terminal of claim 8 , wherein the uplink data switching is requested from the upper layer when a random access procedure is successfully performed on the target base station.