US 12,035,192 B2
Method and apparatus for configuring fallback for each bearer when DAPS handover fails in next-generation mobile communication system
Donggun Kim, Suwon-si (KR); and Soenghun Kim, Suwon-si (KR)
Assigned to Samsung Electronics Co., Ltd., Suwon-si (KR)
Filed by Samsung Electronics Co., Ltd., Suwon-si (KR)
Filed on Jun. 27, 2022, as Appl. No. 17/850,154.
Application 17/850,154 is a continuation of application No. 17/141,629, filed on Jan. 5, 2021, granted, now 11,375,423.
Claims priority of application No. 10-2020-0001601 (KR), filed on Jan. 6, 2020; application No. 10-2020-0010919 (KR), filed on Jan. 30, 2020; application No. 10-2020-0017747 (KR), filed on Feb. 13, 2020; and application No. 10-2020-0024575 (KR), filed on Feb. 27, 2020.
Prior Publication US 2022/0330118 A1, Oct. 13, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04W 36/08 (2009.01); H04W 12/043 (2021.01); H04W 36/00 (2009.01); H04W 80/02 (2009.01)
CPC H04W 36/08 (2013.01) [H04W 12/043 (2021.01); H04W 36/0079 (2018.08); H04W 80/02 (2013.01); H04W 36/00 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method performed by a terminal in a wireless communication system, the method comprising:
determining whether to configure at least one dual active protocol stack (DAPS) bearer based on information for a reconfiguration with synchronization (sync);
establishing, for each signaling radio bearer (SRB), a radio link control (RLC) entity for a target cell group with a same configuration for a source cell group, in case that the at least one DAPS bearer is configured;
establishing, for each SRB, a logical channel for the target cell group with the same configuration for the source cell group;
suspending an SRB for the source cell group;
determining whether the reconfiguration with sync fails;
identifying that the at least one DAPS bearer is configured and a radio link failure is not detected in the source cell group, in case that the reconfiguration with sync fails; and
configuring, for each SRB, a state variable for a packet data convergence protocol (PDCP) entity for the source cell group with a value stored in a PDCP entity for the target cell group in case that a security key is maintained based on the identification.