US 12,256,454 B2
Failure handling for secondary cell
Fangli Xu, Beijing (CN); Chunhai Yao, Beijing (CN); Clive E. Rodgers, Palo Alto, CA (US); Dawei Zhang, Saratoga, CA (US); Haijing Hu, Los Gatos, CA (US); Haitong Sun, Cupertino, CA (US); Wei Zeng, Saratoga, CA (US); Yuqin Chen, Beijing (CN); Yushu Zhang, Beijing (CN); and Zhibin Wu, Los Altos, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Appl. No. 17/755,483
Filed by Apple Inc., Cupertino, CA (US)
PCT Filed Nov. 4, 2019, PCT No. PCT/CN2019/115258
§ 371(c)(1), (2) Date Apr. 29, 2022,
PCT Pub. No. WO2021/087644, PCT Pub. Date May 14, 2021.
Prior Publication US 2024/0172310 A1, May 23, 2024
Int. Cl. H04W 76/19 (2018.01); H04W 16/28 (2009.01); H04W 72/1263 (2023.01); H04W 72/56 (2023.01); H04W 74/0833 (2024.01)
CPC H04W 76/19 (2018.02) [H04W 16/28 (2013.01); H04W 72/1263 (2013.01); H04W 72/56 (2023.01); H04W 74/0833 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method, comprising:
at a user equipment (UE) connected to a wireless network and operating in a carrier aggregation (CA) state comprising a first connection to a primary cell and a second connection to a secondary cell:
determining a beam failure has occurred for the second connection; and
initiating a beam failure recovery (BFR) operation, wherein the BFR operation comprises:
transmitting, to the wireless network, a number of dedicated failure scheduling requests;
starting a timer when the transmission of the number of dedicated failure scheduling requests begins;
identifying that the timer expires before the BFR operation is successful;
releasing all sounding reference signals (SRS) in response to the identifying;
releasing configured uplink grants in response to the identifying;
initiating a random access channel (RACH) procedure with the primary cell in response to the identifying; and
transmitting, to the wireless network, a BFR Medium Access Control (MAC) Control Element (CE).