US 12,219,419 B2
Conditional handover management
Chih-Hsiang Wu, Taoyuan (TW); and Jing Hsieh, Taipei (TW)
Assigned to GOOGLE LLC, Mountain View, CA (US)
Filed by GOOGLE LLC, Mountain View, CA (US)
Filed on May 20, 2022, as Appl. No. 17/749,554.
Application 17/749,554 is a continuation of application No. 17/765,536, previously published as PCT/US2020/053671, filed on Oct. 1, 2020.
Application 17/765,536 is a continuation of application No. 16/879,977, filed on May 21, 2020, abandoned.
Claims priority of provisional application 62/910,448, filed on Oct. 3, 2019.
Prior Publication US 2022/0279412 A1, Sep. 1, 2022
Int. Cl. H04W 36/24 (2009.01); H04W 24/08 (2009.01); H04W 36/08 (2009.01); H04W 36/36 (2009.01); H04W 74/0833 (2024.01); H04W 76/27 (2018.01); H04W 76/30 (2018.01)
CPC H04W 36/24 (2013.01) [H04W 24/08 (2013.01); H04W 36/362 (2023.05); H04W 74/0833 (2013.01); H04W 76/27 (2018.02); H04W 76/30 (2018.02); H04W 36/08 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A method, in a user device, comprising:
receiving, from a source base station and while the user device is operating in a source cell covered by the source base station, (i) multiple conditional handover configurations, each of which is for a respective candidate target cell of multiple candidate target cells, and (ii) indications of one or more sets of conditions to be satisfied before the user device performs a handover to a candidate target cell included in the multiple candidate target cells;
detecting, by the user device, a communication failure between the user device and the source base station; and
in response to the detecting of the communication failure:
selecting a first new cell that is one of the multiple candidate target cells;
performing, using the respective conditional handover configuration for the first new cell received from the source base station, a conditional handover to the first new cell;
failing a random access procedure with the first new cell; and
subsequent to the failure of the random access procedure with the first new cell:
releasing the multiple conditional handover configurations;
selecting a second new cell that is not one of the multiple candidate target cells; and
performing a radio resource control reestablishment procedure with the second new cell.