Method and apparatus for handling rrc message

A method for handling a Radio Resource Control (RRC) message, comprising:

• receiving, by a User Equipment (UE) from a Control Unit (CU), the RRC message via a source Distributed Unit (DU);
• processing, by the UE, the received RRC message based on a configuration associated with the source DU;
• receiving, by the UE from a gNode (gNB), a Medium Access Control-Control Element (MAC CE) to perform a Lower-layer Triggered Mobility (LTM) from the source DU to a target DU during the processing of the RRC message;
• applying, by the UE, one or more reconfigurations based on the processed RRC message;
• and
• transmitting, by the UE to the gNB, an indication indicating usage of the configuration of the source DU to apply the one or more reconfigurations associated with the RRC message.

An apparatus for handling a Radio Resource Control (RRC) message, comprising:

• a memory;
• and
• at least one processor, comprising processing circuitry, in communication with the memory, wherein at least one processor, individually and/or collectively, is configured to cause the apparatus to:
• receive a Medium Access Control-Control Element (MAC CE) from a gNodeB (gNB);
• perform a Lower-layer Triggered Mobility (LTM) from a source Distributed Unit (DU) to a target DU based on the received MAC CE;
• receive the RRC message from the gNB, via the source DU, while performing the LTM from the source DU to the target DU;
• determine whether the RRC message is received within a specified time duration from the received MAC CE;
• and
• apply one or more reconfigurations associated with the RRC message based on a configuration associated with the target DU,
• wherein a configuration associated with the source DU is stored at the UE after performing the LTM to the target DU.

An apparatus for handling a Radio Resource Control (RRC) message, comprising:

• a memory;
• and
• at least one processor, comprising processing circuitry, in communication with the memory, wherein at least one processor, individually and/or collectively, is configured to cause the apparatus to:
• receive from a Control Unit (CU), the RRC message via a source Distributed Unit (DU);
• process the received RRC message based on a configuration associated with the source DU,
• receive, from a gNode (gNB), a Medium Access Control-Control Element (MAC CE) to perform a Lower-layer Triggered Mobility (LTM) from the source DU to a target DU during the processing of the RRC message;
• apply one or more reconfigurations based on the processed RRC message;
• and
• transmit, to the gNB, an indication indicating usage of the configuration of the source DU to apply the one or more reconfigurations associated with the RRC message.