US 12,143,876 B2
Method for radio link failure recovery and user equipment
Ningjuan Chang, Shanghai (CN); and Renmao Liu, Shanghai (CN)
Assigned to SHARP KABUSHIKI KAISHA, Sakai (JP)
Appl. No. 17/628,161
Filed by SHARP KABUSHIKI KAISHA, Sakai (JP)
PCT Filed Jul. 22, 2020, PCT No. PCT/CN2020/103471
§ 371(c)(1), (2) Date Jan. 18, 2022,
PCT Pub. No. WO2021/013170, PCT Pub. Date Jan. 28, 2021.
Claims priority of application No. 201910670623.2 (CN), filed on Jul. 23, 2019.
Prior Publication US 2022/0322173 A1, Oct. 6, 2022
Int. Cl. H04W 36/00 (2009.01); H04W 36/08 (2009.01)
CPC H04W 36/00837 (2018.08) [H04W 36/0058 (2018.08); H04W 36/08 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A user equipment (UE), comprising:
transmitting circuitry; and
a processor configured to, upon initiation of a radio resource control (RRC) connection reestablishment procedure, perform at least one action, wherein
the at least one action includes determining whether a conditional handover configuration is configured or not, and
the at least one action includes suspending all radio bearer(s) (RBs) except a signaling radio bearer 0 (SRB0) if the UE is not configured with the conditional handover configuration, wherein
the processor is further configured to perform a cell selection, and
the processor and the transmitting circuitry are configured such that:
if (i) the RRC connection reestablishment procedure is triggered by detecting a radio link failure of a master cell group (MCG) or a reconfiguration with sync failure of the MCG, (ii) the UE is enabled with a conditional handover link recovery function, and (iii) a selected cell is a conditional handover candidate cell indicated by a reconfigurationWithSync information element (IE) in the conditional handover configuration that is stored, the processor performs a handover according to the stored conditional handover configuration associated with the selected cell, and
otherwise, the UE performs one or more actions, wherein
the one or more actions include suspending, by the processor, all the RBs, except the SRB0, if the UE is configured with the conditional handover configuration, and
the one or more actions include initiating, by the transmitting circuitry, a transmission of an RRC Reestablishment Request message.