US 12,336,008 B2
Apparatus and method of handling uplink listen before talk (LBT) failures for new radio (NR) systems operating on unlicensed spectrum
Anthony Lee, San Diego, CA (US); Seau S. Lim, Swindon (GB); Youn Hyoung Heo, San Jose, CA (US); Salvatore Talarico, Sunnyvale, CA (US); Yongjun Kwak, Portland, OR (US); Bishwarup Mondal, San Ramon, CA (US); and Carlos H. Aldana, Santa Clara, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Appl. No. 17/440,673
Filed by Apple Inc., Cupertino, CA (US)
PCT Filed May 1, 2020, PCT No. PCT/US2020/031158
§ 371(c)(1), (2) Date Sep. 17, 2021,
PCT Pub. No. WO2020/223692, PCT Pub. Date Nov. 5, 2020.
Claims priority of provisional application 62/841,693, filed on May 1, 2019.
Prior Publication US 2022/0167408 A1, May 26, 2022
Int. Cl. H04W 74/08 (2024.01); H04W 72/04 (2023.01); H04W 72/044 (2023.01); H04W 74/0816 (2024.01); H04W 76/19 (2018.01)
CPC H04W 74/0816 (2013.01) [H04W 72/044 (2013.01); H04W 74/0866 (2013.01); H04W 76/19 (2018.02)] 18 Claims
OG exemplary drawing
 
1. A method of operating a user equipment (UE) in a wireless network, comprising:
identifying a plurality of transmission occasions to be performed by the UE;
performing, by the UE, a plurality of listen before talk (LBT) procedures associated with respective ones of the plurality of transmission occasions;
tracking, by the UE, a number of LBT failures during the performing;
implementing, by the UE, a recovery procedure in response to the number of LBT failures exceeding a predetermined threshold within a predetermined time period; and
adjusting the predetermined threshold based on a number of transmission occasions in the plurality of transmission occasions.