US 12,262,255 B2
Operation method and apparatus of protocol layer device for efficient handover in wireless communication system
Donggun Kim, Suwon-si (KR)
Assigned to Samsung Electronics Co., Ltd., Suwon-si (KR)
Appl. No. 17/755,774
Filed by SAMSUNG ELECTRONICS CO., LTD., Suwon-si (KR)
PCT Filed Nov. 6, 2020, PCT No. PCT/KR2020/015528
§ 371(c)(1), (2) Date May 6, 2022,
PCT Pub. No. WO2021/091315, PCT Pub. Date May 14, 2021.
Claims priority of application No. 10-2019-0141259 (KR), filed on Nov. 6, 2019.
Prior Publication US 2022/0394581 A1, Dec. 8, 2022
Int. Cl. H04W 36/18 (2009.01); H04W 36/00 (2009.01)
CPC H04W 36/0033 (2013.01) [H04W 36/0055 (2013.01); H04W 36/185 (2023.05)] 14 Claims
OG exemplary drawing
 
1. A method performed by 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 including configuration information indicating reconfiguration with sync, identification information of a bearer, and dual active protocol stack (DAPS) configuration information indicating that the bearer is configured as a DAPS bearer;
reconfiguring a packet data convergence protocol (PDCP) entity of the UE for the bearer based on the first RRC reconfiguration message;
in case that a random access to the target base station is successfully completed, requesting, by an RRC entity of the UE, the PDCP entity to switch uplink data;
in case that the uplink data switching being requested, identifying whether a PDCP protocol data unit (PDU) is a PDCP data PDU or a PDCP control PDU;
in case that the PDCP PDU is the PDCP control PDU, identifying whether the PDCP control PDU is associated with the source base station or the target base station; and
in case that the PDCP control PDU is associated with the source base station, submitting, by the PDCP entity, the PDCP control PDU to a radio link control (RLC) entity associated with the source base station.