Beam failure recovery and related timing determination techniques

A method for wireless communication by a network entity, comprising:

• receiving a beam failure recovery request (BFRQ) message on a second cell indicating a failure of a beam on a first cell;
• sending a beam failure recovery response (BFRR) message on the second cell;
• determining, based on a first subcarrier spacing (SCS) of the first cell and a second SCS of a second cell, a duration starting from sending of the BFRR message until using a default beam for communications with a user equipment (UE) on the first cell;
• and
• communicating with the UE on the first cell, using the default beam, after the determined duration.

An apparatus for wireless communication, comprising:

• at least one processor coupled with a memory, the memory comprising code executable by the at least one processor to cause the apparatus to:
• detect failure of a beam associated with a first cell;
• send a beam failure recovery request (BFRQ) message on a second cell;
• receive a beam failure recovery response (BFRR) message on the second cell;
• and
• determine, based on a first subcarrier spacing (SCS) of the first cell and a second SCS of a second cell, a duration starting from reception of the BFRR message until using a default beam for communications on the first cell.

An apparatus for wireless communication, comprising:

• at least one processor coupled with a memory, the memory comprising code executable by the at least one processor to cause the apparatus to:
• receive a beam failure recovery request (BFRQ) message on a second cell indicating a failure of a beam on a first cell;
• send a beam failure recovery response (BFRR) message on the second cell;
• determine, based on a first subcarrier spacing (SCS) of the first cell and a second SCS of a second cell, a duration starting from sending of the BFRR message until using a default beam for communications with a user equipment (UE) on a first cell;
• and
• communicate with the UE on the first cell, using the default beam, after the determined duration.