US 12,068,909 B2
Beam failure recovery
Kyle Jung-Lin Pan, Saint James, NY (US); Fengjun Xi, San Diego, CA (US); Afshin Haghighat, Ile-Bizard (CA); and Moon-il Lee, Melville, NY (US)
Assigned to SONY GROUP CORPORATION, Tokyo (JP)
Filed by Sony Group Corporation, Tokyo (JP)
Filed on Jun. 28, 2023, as Appl. No. 18/215,198.
Application 18/215,198 is a continuation of application No. 17/391,071, filed on Aug. 2, 2021, granted, now 11,722,361.
Application 17/391,071 is a continuation of application No. 16/475,735, granted, now 11,082,286, issued on Aug. 3, 2021, previously published as PCT/US2018/012563, filed on Jan. 5, 2018.
Claims priority of provisional application 62/519,614, filed on Jun. 14, 2017.
Claims priority of provisional application 62/500,884, filed on May 3, 2017.
Claims priority of provisional application 62/454,486, filed on Feb. 3, 2017.
Claims priority of provisional application 62/443,382, filed on Jan. 6, 2017.
Prior Publication US 2023/0344701 A1, Oct. 26, 2023
Int. Cl. H04L 41/0654 (2022.01); H04B 7/06 (2006.01); H04B 7/08 (2006.01); H04L 5/00 (2006.01); H04W 56/00 (2009.01); H04W 72/21 (2023.01); H04W 72/23 (2023.01); H04W 74/0833 (2024.01)
CPC H04L 41/0654 (2013.01) [H04B 7/0695 (2013.01); H04B 7/088 (2013.01); H04L 5/0048 (2013.01); H04W 56/001 (2013.01); H04W 72/21 (2023.01); H04W 72/23 (2023.01); H04W 74/0833 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method Implemented in a wireless transmit receive unit (WTRU), the method comprising:
determining, based on a channel state Information-reference signal (CSI-RS) or a synchronization signal block (SSB), that a beam failure condition has occurred, wherein the beam failure condition is associated with transmissions between the WTRU and a network entity;
transmitting a beam failure recovery request to the network entity using a Physical Random Access Channel (PRACH) resource, wherein the beam failure recovery request indicates a candidate beam Identified by the WTRU,
wherein the beam failure recovery request is sent if the candidate beam has been identified by measuring beam quality on at least one of the CSI-RS or the SSB being above a threshold for resolving the beam failure condition, the PRACH resource used to transmit the beam failure recovery request being associated with at least one of a reference signal or a synchronization signal block; and
receiving a response associated with the beam failure recovery request from the network entity by monitoring a physical downlink control channel (PDCCH) and reporting or indicating to a higher layer if the WTRU does not receive a response within a time window.