US 11,895,695 B2
System and method for beam failure recovery request by user equipment
Muhammad Nazmul Islam, Littleton, MA (US); Bilal Sadiq, Basking Ridge, NJ (US); Sony Akkarakaran, Poway, CA (US); Linhai He, San Diego, CA (US); Sundar Subramanian, San Diego, CA (US); and Juergen Cezanne, Ocean Township, NJ (US)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Feb. 13, 2019, as Appl. No. 16/275,009.
Claims priority of provisional application 62/631,398, filed on Feb. 15, 2018.
Prior Publication US 2019/0254064 A1, Aug. 15, 2019
Int. Cl. H04W 74/00 (2009.01); H04B 7/06 (2006.01); H04B 7/08 (2006.01); H04B 17/318 (2015.01); H04L 41/0654 (2022.01); H04W 76/18 (2018.01); H04W 76/19 (2018.01); H04L 43/0817 (2022.01); H04W 56/00 (2009.01); H04W 74/04 (2009.01); H04W 74/08 (2009.01); H04B 7/04 (2017.01); H04W 16/00 (2009.01); H04W 72/21 (2023.01)
CPC H04W 74/004 (2013.01) [H04B 7/04 (2013.01); H04L 43/0817 (2013.01); H04W 16/00 (2013.01); H04W 56/001 (2013.01); H04W 72/21 (2023.01); H04W 74/04 (2013.01); H04W 74/0883 (2013.01); H04W 76/19 (2018.02)] 30 Claims
OG exemplary drawing
 
1. A method of wireless communication by a user equipment (UE), the method comprising:
determining whether to use a contention-free random access channel (RACH) procedure with a dedicated preamble or a contention-based RACH procedure for beam failure recovery with a base station based on receiving a RACH configuration from the base station for at least one of the contention-free RACH procedure with the dedicated preamble or the contention-based RACH procedure;
performing, based on detection of a failure of a serving beam through which the UE communicates with the base station, the determined one of the contention-free RACH procedure with the dedicated preamble or the contention-based RACH procedure for the beam failure recovery, wherein the dedicated preamble is determined using a beam corresponding to a reference signal, wherein the reference signal is selected based on a power metric associated with the reference signal.