Beam source assistance information

An apparatus comprising at least one processor;

• and at least one memory storing instruction that, when executed by the at least one processor, cause the apparatus, which is configured to communicate on a source transmission configuration indication state, to:
• receive, from a network using the source transmission configuration indication state, a configuration for a state switch from the source transmission configuration indication state to a target transmission configuration indication state;
• determine that the apparatus is operated in a high-speed train frequency range 2 (HST FR2) scenario;
• determine whether or not the target state is among active transmission configuration indication states;
• determine a state switch delay based on determining that the apparatus is operated in the HST FR2 scenario and based on determining whether or not the target state is among the active transmission configuration indication states;
• perform the state switch within the determined state switch delay;
• and
• based on receiving an indication that a one-time uplink timing adjustment is allowed, apply the one-time uplink timing adjustment after the state switch.