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 |
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.
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