US 12,237,906 B2
Methods for msg-B in two-step RACH
Afshin Haghighat, Ile-Bizard (CA); Shahrokh Nayeb Nazar, San Diego, CA (US); Loic Canonne-Velasquez, Dorval (CA); Faris Alfarhan, Montreal (CA); and J. Patrick Tooher, Montreal (CA)
Assigned to InterDigital Patent Holdings, Inc., Wilmington, DE (US)
Appl. No. 17/429,846
Filed by INTERDIGITAL PATENT HOLDINGS, INC., Wilmington, DE (US)
PCT Filed Feb. 13, 2020, PCT No. PCT/US2020/018146
§ 371(c)(1), (2) Date Aug. 10, 2021,
PCT Pub. No. WO2020/168103, PCT Pub. Date Aug. 20, 2020.
Claims priority of provisional application 62/930,911, filed on Nov. 5, 2019.
Claims priority of provisional application 62/908,883, filed on Oct. 1, 2019.
Claims priority of provisional application 62/840,647, filed on Apr. 30, 2019.
Claims priority of provisional application 62/805,084, filed on Feb. 13, 2019.
Prior Publication US 2022/0190906 A1, Jun. 16, 2022
Int. Cl. H04B 7/08 (2006.01); H04L 5/00 (2006.01); H04W 24/08 (2009.01); H04W 24/10 (2009.01); H04W 74/0833 (2024.01); H04W 76/19 (2018.01)
CPC H04B 7/088 (2013.01) [H04L 5/0051 (2013.01); H04W 24/08 (2013.01); H04W 24/10 (2013.01); H04W 74/0841 (2013.01); H04W 76/19 (2018.02)] 14 Claims
OG exemplary drawing
 
1. A method implemented by a wireless transmit receive unit (WTRU) for beam failure recovery (BFR), the method comprising:
receiving information indicating a set of reference signals corresponding to a set of beams;
detecting beam failure associated with transmitting or receiving with a serving cell;
determining information indicating a subset of the set of reference signals based on one or more measurements;
transmitting a first message including a preamble and a payload, wherein the payload includes an index of each reference signal in the subset of the set of reference signals; and
receiving a second message, wherein the second message is a random access response to the first message, wherein the second message includes a physical downlink control channel (PDCCH) transmission addressed to a cell radio network temporary identity (C-RNTI) of the WTRU, wherein the inclusion of the C-RNTI in the second message indicates that beam failure recovery was successful, wherein the second message is monitored for on at least one beam associated with the first message.