US 12,231,981 B2
Method and device for performing handover in wireless communication system
Donggun Kim, Suwon-si (KR); and Soenghun Kim, Suwon-si (KR)
Assigned to Samsung Electronics Co., Ltd., Suwon-si (KR)
Appl. No. 17/774,006
Filed by Samsung Electronics Co., Ltd., Suwon-si (KR)
PCT Filed Nov. 5, 2020, PCT No. PCT/KR2020/015382
§ 371(c)(1), (2) Date May 3, 2022,
PCT Pub. No. WO2021/091248, PCT Pub. Date May 14, 2021.
Claims priority of application No. 10-2019-0141264 (KR), filed on Nov. 6, 2019; and application No. 10-2019-0152233 (KR), filed on Nov. 25, 2019.
Prior Publication US 2022/0386182 A1, Dec. 1, 2022
Int. Cl. H04W 36/08 (2009.01); H04W 36/00 (2009.01); H04W 36/18 (2009.01)
CPC H04W 36/087 (2023.05) [H04W 36/0064 (2023.05); H04W 36/185 (2023.05)] 15 Claims
OG exemplary drawing
 
1. A method of operating a user equipment (UE) in a wireless communication system, the method comprising:
receiving, from a source base station, a first radio resource control (RRC) reconfiguration message indicating handover, the first RRC reconfiguration message including data radio bearer (DRB) configuration information, the DRB configuration information including an indicator indicating a dual active protocol stack (DAPS) is configured for at least one DRB;
in case that the indicator indicates the DAPS is configured for at least one DRB, generating a medium access control (MAC) entity for a target base station;
configuring the MAC entity for the target base station based on MAC configuration information included in the first RRC reconfiguration message indicating the handover;
suspending a signaling radio bearer (SRB) for the source base station;
establishing or configuring an SRB for the target base station;
receiving a second RRC reconfiguration message from the target base station; and
in case that the second RRC reconfiguration message received from the target base station includes an indicator for release of the source base station, releasing an RLC entity for the source base station for the at least one DRB.