US 12,132,552 B2
Beam failure recovery using contention based random access
Fangli Xu, Beijing (CN); Dawei Zhang, Saratoga, CA (US); Haijing Hu, Beijing (CN); Yuqin Chen, Shenzhen (CN); Haitong Sun, Irvine, CA (US); and Wei Zeng, San Diego, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Aug. 23, 2022, as Appl. No. 17/893,356.
Application 17/893,356 is a continuation of application No. 17/051,149, granted, now 11,695,463, previously published as PCT/CN2018/093359, filed on Jun. 28, 2018.
Prior Publication US 2022/0399929 A1, Dec. 15, 2022
Int. Cl. H04B 7/06 (2006.01); H04W 74/0833 (2024.01); H04W 76/19 (2018.01); H04W 76/27 (2018.01); H04W 80/02 (2009.01); H04W 88/08 (2009.01)
CPC H04B 7/0695 (2013.01) [H04B 7/0617 (2013.01); H04W 74/0833 (2013.01); H04W 76/19 (2018.02); H04W 76/27 (2018.02); H04W 80/02 (2013.01); H04W 88/08 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A wireless device, comprising:
an antenna;
a radio operably coupled to the antenna; and
a processor operably coupled to the radio, wherein the wireless device is configured to:
receive beam configuration information for a cellular link, wherein the beam configuration information indicates one or more beams for downlink communications from a cellular base station;
detect beam failure for a first beam;
transmit a random access preamble to the cellular base station as part of a contention based random access procedure based at least in part on the beam failure for the first beam;
receive a random access response scheduling transmission of a message 3 of the contention based random access procedure; and
transmit the message 3 to the cellular base station, wherein the message 3 includes a media access control (MAC) control element (CE) (MAC CE) indicating the beam failure.