US 12,477,430 B2
Radio (NR) handover, radio link monitoring (RLM), beam failure detection (BFD), and candidate beam detection (CBD) with clear channel assessment (CCA)
Xiang Chen, Campbell, CA (US); Dawei Zhang, Saratoga, CA (US); Huaning Niu, San Jose, CA (US); Jie Cui, San Jose, CA (US); Manasa Raghavan, Sunnyvale, CA (US); Qiming Li, Beijing (CN); and Yang Tang, San Jose, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Sep. 30, 2022, as Appl. No. 17/958,048.
Claims priority of provisional application 63/295,143, filed on Dec. 30, 2021.
Prior Publication US 2023/0217339 A1, Jul. 6, 2023
Int. Cl. H04W 36/38 (2009.01); H04W 36/30 (2009.01); H04W 56/00 (2009.01)
CPC H04W 36/305 (2018.08) [H04W 36/38 (2013.01); H04W 56/004 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A user equipment (UE), comprising:
a transceiver configured to wirelessly communicate with a serving cell; and
a processor communicatively coupled to the transceiver and configured to:
receive, using the transceiver, a handover command to connect to a target cell;
initiate a handover procedure responsive to the handover command;
in response to a listen-before-talk (LBT) failure or the UE performing a beam sweeping operation during the handover procedure, determine a search time and an interruption time uncertainty;
determine a handover delay based on the search time and the interruption time uncertainty;
in response to a time period for performing the handover procedure exceeding the handover delay, cease the handover procedure;
determine an evaluation time period for radio link monitoring (RLM) based on the LBT failure or the UE performing the beam sweeping operation;
use the evaluation time period for an RLM operation;
compare a time period between two closest successful measurements to a threshold; and
in response to the time period between two closest successful measurements exceeding the threshold, reset the evaluation time period and re-determine the evaluation time period.