US 12,262,414 B2
Beamforming failure detection and recovery in high mmwave systems
Oghenekome Oteri, San Diego, CA (US); Yushu Zhang, Beijing (CN); Huaning Niu, San Jose, CA (US); Weidong Yang, San Diego, CA (US); Sigen Ye, Whitehouse Station, NJ (US); Haitong Sun, Cupertino, CA (US); Chunxuan Ye, San Diego, CA (US); Chunhai Yao, Beijing (CN); Hong He, San Jose, CA (US); Wei Zeng, Saratoga, CA (US); and Dawei Zhang, Saratoga, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Appl. No. 17/441,267
Filed by Apple Inc., Cupertino, CA (US)
PCT Filed Oct. 16, 2020, PCT No. PCT/CN2020/121485
§ 371(c)(1), (2) Date Sep. 20, 2021,
PCT Pub. No. WO2022/077437, PCT Pub. Date Apr. 21, 2022.
Prior Publication US 2023/0239924 A1, Jul. 27, 2023
Int. Cl. H04W 74/08 (2024.01); H04L 5/00 (2006.01); H04W 74/04 (2009.01); H04W 74/0816 (2024.01); H04W 76/19 (2018.01)
CPC H04W 74/0816 (2013.01) [H04L 5/0051 (2013.01); H04W 74/04 (2013.01); H04W 76/19 (2018.02)] 20 Claims
OG exemplary drawing
 
1. An access node (AN) for scheduling transmission of a plurality of reference signals over a plurality of downlink communication beams, the AN comprising:
a physical layer (PHY) circuitry configured to wirelessly communicate with a user equipment (UE); and
a processor configured to:
schedule a plurality of transmissions of the plurality of reference signals over the plurality of downlink communication beams,
perform a Listen before talk (LBT) procedure to monitor a portion of a spectrum, the LBT procedure is to:
identify a first channel occupancy time (COT) and a second COT where the portion of the spectrum is free from other transmissions,
generate an indication of a LBT Failure where the portion of the spectrum is occupied by one or more other transmissions,
transmit, using the PHY circuitry, a first transmission of the plurality of reference signals from among the plurality of transmissions over the plurality of downlink communication beams during the first COT,
ignore a second transmission of the plurality of reference signals from among the plurality of transmissions that is scheduled to be transmitted during the LBT Failure, and
transmit, using the PHY circuitry, a third transmission of the plurality of reference signals from among the plurality of transmissions over the plurality of downlink communication beams during the second COT.