US 12,457,658 B2
Radio link failure recovery method and corresponding user equipment
Ningjuan Chang, Shanghai (CN); and Takako Hori, Sakai (JP)
Assigned to SHARP KABUSHIKI KAISHA, Sakai (JP)
Appl. No. 17/923,986
Filed by Sharp Kabushiki Kaisha, Sakai (JP)
PCT Filed Apr. 28, 2021, PCT No. PCT/CN2021/090694
§ 371(c)(1), (2) Date Nov. 8, 2022,
PCT Pub. No. WO2021/227881, PCT Pub. Date Nov. 18, 2021.
Claims priority of application No. 202010405241.X (CN), filed on May 13, 2020.
Prior Publication US 2023/0180330 A1, Jun. 8, 2023
Int. Cl. H04W 76/19 (2018.01); H04W 36/00 (2009.01); H04W 76/36 (2018.01)
CPC H04W 76/19 (2018.02) [H04W 36/0079 (2018.08); H04W 76/36 (2018.02)] 3 Claims
OG exemplary drawing
 
1. A radio link failure recovery method performed by a user equipment (UE), the radio link failure recovery method comprising:
initiating a Radio Resource Control (RRC) connection re-establishment procedure based on a handover failure; and
performing a plurality of operations in the RRC connection re-establishment procedure, based on any Dual Active Protocol Stack (DAPS) configured for the UE,
wherein the plurality of operations includes:
resetting Medium Access Control (MAC) for a source base station;
releasing a MAC configuration for the source base station;
for each DAPS bearer, releasing a Radio Link Control (RLC) entity or entities and an associated logical channel or channels for the source base station, and reconfiguring a Protocol Data Aggregation Protocol (PDCP) entity to release the DAPS;
for each signaling radio bearer (SRB), releasing a PDCP entity for the source base station, and releasing an RLC entity and an associated logical channel for the source base station;
releasing a physical channel configuration for the source base station; and
discarding security keys used in the source base station.