Methods and apparatuses for ta acquisition failure and preamble transmission collision

A centralized unit (CU) of a base station, comprising:

• at least one memory;
• and
• at least one processor coupled with the at least one memory and configured to cause the CU to:
• transmit a request to a candidate distributed unit (DU) of the base station,
• wherein the request includes identifier (ID) information of one or more candidate cells;
• receive a response corresponding to the request from the candidate DU, wherein
• the response is associated with a cell switching procedure;
• and
• transmit first configuration information to a user equipment (UE) via a source DU of the base station based on the response.

A user equipment (UE), comprising:

• at least one memory;
• and
• at least one processor coupled with the at least one memory and configured to cause the UE to:
• receive radio resource control (RRC) configuration information associated with one or more candidate cells related to a cell switching procedure;
• and
• receive a first indication to trigger a timing advance (TA) acquisition procedure or a TA re-acquisition procedure to a first candidate cell within the one or more candidate cells before performing the cell switching procedure.

A processor for wireless communication, comprising:

• at least one controller coupled with at least one memory and configured to cause the processor to:
• receive radio resource control (RRC) configuration information associated with one or more candidate cells related to a cell switching procedure;
• and
• receive a first indication to trigger a timing advance (TA) acquisition procedure or a TA re-acquisition procedure to a first candidate cell within the one or more candidate cells before performing the cell switching procedure.