Beam failure recovery

A method implemented in a wireless transmit receive unit (WTRU), the method comprising:

• determining that a beam failure condition has occurred, wherein the beam failure condition is associated with transmissions between the WTRU and a network entity;
• identifying a candidate beam for resolving the beam failure condition;
• transmitting a beam failure recovery request to the network entity using a Physical Random Access Channel (PRACH) resource or a Physical Uplink Control Channel (PUCCH) resource, wherein the beam failure recovery request indicates the candidate beam identified by the WTRU;
• and
• receiving a response associated with the beam failure recovery request from the network entity,
• wherein the PRACH resource or the PUCCH resource used to transmit the beam failure recovery request is associated with at least one of a reference signal or a synchronization signal block.

A wireless transmit receive unit (WTRU) comprising:

• a processor configured to:
• determine that a beam failure condition has occurred, wherein the beam failure condition is associated with transmissions between the WTRU and a network entity;
• identify a candidate beam for resolving the beam failure condition;
• transmit a beam failure recovery request to the network entity using a Physical Random Access Channel (PRACH) resource or a Physical Uplink Control Channel (PUCCH) resource, wherein the beam failure recovery request indicates the candidate beam identified by the WTRU;
• and
• receive a response associated with the beam failure recovery request from the network entity, wherein
• the PRACH resource or the PUCCH resource used to transmit the beam failure recovery request is associated with at least one of a reference signal or a synchronization signal block.

A wireless transmit receive unit (WTRU) comprising:

• a processor configured to:
• determine that a beam failure condition has occurred, wherein the beam failure condition is associated with transmissions between the WTRU and a network entity;
• identify a candidate beam for resolving the beam failure condition;
• transmit a beam failure recovery request to the network entity using a Physical Random Access Channel (PRACH) resource or a Physical Uplink Control Channel (PUCCH) resource, wherein the beam failure recovery request indicates the candidate beam identified by the WTRU;
• and
• receive a response associated with the beam failure recovery request from the network entity,
• wherein the processor being configured to determine that the beam failure condition has occurred comprises the processor being configured to monitor at least one of a channel state information-reference signal (CSI-RS) or a synchronization signal block (SSB) to assess whether the beam failure condition has been met.