Transmission configuration indicator state indication for inter-distributed unit layer 1/layer 2-triggered mobility

An apparatus for wireless communications at a target distributed unit (DU), comprising:

• one or more memories storing processor-executable code;
• and
• one or more processors coupled with the one or more memories and operable to execute the code to cause the apparatus to:
• transmit a plurality of reference signals associated with a plurality of transmission configuration indicator (TCI) states;
• receive, from a source DU, an indication of a first set of one or more candidate TCI states from the plurality of TCI states for a dynamic cell switch of a user equipment (UE) from a source cell of the source DU to a target cell of the target DU;
• and
• transmit, to the source DU, a control message indicating a resource allocation that identifies one or more resources reserved for the UE to perform the dynamic cell switch.

An apparatus for wireless communications at a user equipment (UE), comprising:

• one or more memories storing processor-executable code;
• and
• one or more processors coupled with the one or more memories and operable to execute the code to cause the apparatus to:
• receive, from a source distributed unit (DU), a control message instructing the UE to perform a random access procedure via a target cell of a target DU, the control message indicating a first transmission configuration indicator (TCI) state for transmission of a first random access preamble of the random access procedure;
• transmit, to the target DU, the first random access preamble via the target cell of the target DU in accordance with the first TCI state;
• perform a dynamic cell switch from a source cell of the source DU to the target cell of the target DU;
• and
• transmit, in accordance with the first TCI state, a second random access preamble based at least in part on the dynamic cell switch.