US 12,328,632 B2
Methods for enhanced radio link failure recovery
Amr Mostafa, Munich (DE); Fangli Xu, Beijing (CN); and Zhibin Wu, Los Altos, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Appl. No. 17/785,274
Filed by Apple Inc., Cupertino, CA (US)
PCT Filed Sep. 24, 2021, PCT No. PCT/CN2021/120287
§ 371(c)(1), (2) Date Jun. 14, 2022,
PCT Pub. No. WO2023/044745, PCT Pub. Date Mar. 30, 2023.
Prior Publication US 2023/0276332 A1, Aug. 31, 2023
Int. Cl. H04W 36/30 (2009.01); H04W 36/00 (2009.01); H04W 36/36 (2009.01); H04W 76/20 (2018.01)
CPC H04W 36/305 (2018.08) [H04W 36/00835 (2018.08); H04W 36/362 (2023.05); H04W 76/20 (2018.02)] 20 Claims
OG exemplary drawing
 
1. An apparatus, comprising:
a processor configured to when executing instructions stored in a memory, perform operations comprising:
establishing a radio resource control (RRC) connection with a first cell of a cellular network;
transmitting, to the cellular network, signaling comprising an indication of enhanced radio link failure (RLF) recovery capability;
receiving, from the cellular network, one or more RRC messages comprising configuration information for RLF recovery on the first cell, wherein the configuration information comprises one or more enhanced RLF recovery configurations associated with one or more candidate cells, and wherein each of the one or more enhanced RLF recovery configurations correspond to one or more distinct validity periods configured by the cellular network;
detecting one or more RLFs corresponding to the first cell;
determining, via a connection reestablishment cell selection procedure, that the first cell is a suitable RLF recovery candidate cell of the one or more candidate cells;
applying, in response to detecting the one or more RLFs and determining that the first cell is a suitable RLF recovery candidate cell, the configuration information for the first cell;
transmitting, in response to applying the configuration information, signaling comprising a trigger indicating a RLF recovery to the cellular network; and
re-establishing the RRC connection with the cellular network using the configuration information.