US 12,439,303 B2
Method of failure handling in conditional handover
Lianhai Wu, Chaoyang (CN); Bingchao Liu, Changping District (CN); Haiming Wang, Xicheng District (CN); Jie Shi, Haidian District (CN); and Jing Han, Chaoyang District (CN)
Assigned to Lenovo (Beijing) Ltd., Beijing (CN)
Appl. No. 17/791,786
Filed by Lenovo (Beijing) Ltd., Beijing (CN)
PCT Filed Jan. 10, 2020, PCT No. PCT/CN2020/071473
§ 371(c)(1), (2) Date Jul. 8, 2022,
PCT Pub. No. WO2021/138905, PCT Pub. Date Jul. 15, 2021.
Prior Publication US 2023/0059975 A1, Feb. 23, 2023
Int. Cl. H04W 4/00 (2018.01); H04W 36/00 (2009.01); H04W 36/30 (2009.01); H04W 36/36 (2009.01); H04W 48/20 (2009.01)
CPC H04W 36/0079 (2018.08) [H04W 36/305 (2018.08); H04W 36/362 (2023.05); H04W 48/20 (2013.01); H04W 36/00838 (2023.05)] 15 Claims
OG exemplary drawing
 
1. A method performed by a user equipment (UE), the method comprising:
receiving a conditional handover (CHO) configuration;
initiating a re-establishment procedure if one of a plurality of first conditions is met, wherein the plurality of first conditions comprises a radio link failure (RLF), a CHO failure, and a handover (HO) failure;
performing a cell selection procedure;
releasing a PCell configuration if no CHO candidate cell is configured, attemptCHO is not configured, it is not a first cell selection after failure, or a cell without the CHO configuration is selected through the cell selection procedure;
performing a CHO procedure if a cell selected through the cell selection procedure is configured with the CHO configuration; and
performing the re-establishment procedure if the selected cell is not configured with the CHO configuration.