Nested conditional mobility procedures

A source master node (S-MN), comprising:

• a transceiver;
• a memory comprising instructions;
• and
• one or more processors configured to execute the instructions and cause the S-MN to:
• transmit, via the transceiver, configuration information configuring a user equipment (UE) for conditional handover (CHO) from the S-MN to a target master node (T-MN) and for conditional primary secondary cell (PSCell) addition or change (CPAC);
• participate in a nested procedure based on an evaluation of conditions for both CHO and CPAC by the UE in accordance with the configuration information;
• and
• notify one or more T-MNs of at least one target secondary node (T-SN) cell identity upon initialization or completion of a CPAC procedure, wherein:
• the configuration information configures the UE to perform the nested procedure by performing the CPAC procedure if the evaluation of the conditions indicates the CPAC procedure is triggered before a CHO procedure, without regard to a radio link failure (RLF) at the S-MN.

A method for wireless communications at a user equipment (UE), comprising:

• receiving configuration information configuring the UE for conditional handover (CHO) from a source master node (S-MN) to a target master node (T-MN) and for conditional primary secondary cell (PSCell) addition or change (CPAC);
• and
• performing a nested procedure based on an evaluation of conditions for both CHO and CPAC in accordance with the configuration information, the performing the nested procedure comprises:
• performing a CPAC procedure, if the evaluation of the conditions indicates the CPAC procedure is triggered before a CHO procedure, without regard to a radio link failure (RLF) at the S-MN;
• performing the CPAC procedure even if the evaluation of the conditions indicates the CHO procedure is triggered;
• performing the CHO procedure if the evaluation of the conditions indicates the CHO procedure is triggered while the CPAC procedure is in progress;
• and
• recovering a primary cell (PCell) using master cell group (MCG) failure information if the RLF is detected during the CPAC procedure.

An apparatus for wireless communications, comprising:

• a memory comprising instructions;
• and
• one or more processors configured to execute the instructions and cause the apparatus to:
• receive configuration information configuring the apparatus for conditional handover (CHO) from a source master node (S-MN) to a target master node (T-MN) and for conditional primary secondary cell (PSCell) addition or change (CPAC);
• and
• perform a nested procedure based on an evaluation of conditions for both CHO and CPAC in accordance with the configuration information, wherein the one or more processors are configured to cause the apparatus to:
• perform a CPAC procedure if the evaluation of the conditions indicates the CPAC procedure is triggered before a CHO procedure, without regard to a radio link failure (RLF) at the S-MN;
• perform the CPAC procedure even if the evaluation of the conditions indicates the CHO procedure is triggered;
• and
• recover a primary cell (PCell) using master cell group (MCG) failure information if the RLF is detected during the CPAC procedure.

An apparatus for wireless communications, comprising:

• a memory comprising instructions;
• and
• one or more processors configured to execute the instructions and cause the apparatus to:
• receive configuration information configuring the apparatus for conditional handover (CHO) from a source master node (S-MN) to a target master node (T-MN) and for conditional primary secondary cell (PSCell) addition or change (CPAC);
• and
• perform a nested procedure based on an evaluation of conditions for both CHO and CPAC in accordance with the configuration information, wherein the one or more processors being configured to cause the apparatus to:
• perform a CPAC procedure if the evaluation of the conditions indicates the CPAC procedure is triggered before a CHO procedure, without regard to a radio link failure (RLF) at the S-MN;
• and
• recover a primary cell (PCell) using master cell group (MCG) failure information if the RLF is detected during the CPAC procedure.

A source master node (S-MN), comprising:

• a transceiver;
• a memory comprising instructions;
• and
• one or more processors configured to execute the instructions and cause the S-MN to:
• transmit, via the transceiver, configuration information configuring a user equipment (UE) for conditional handover (CHO) from the S-MN to a target master node (T-MN) and for conditional primary secondary cell (PSCell) addition or change (CPAC);
• participate in a nested procedure based on an evaluation of conditions for both CHO and CPAC by the UE in accordance with the configuration information;
• and
• notify one or more T-MNs of at least one target secondary node (T-SN) cell identity upon initialization of a CPAC procedure, wherein the configuration information configures the UE to perform the nested procedure by:
• initiating the CPAC procedure, if the evaluation of the conditions indicates the CPAC procedure is triggered before a CHO procedure;
• and
• prioritizing the CHO procedure, if the evaluation of the conditions subsequently indicates the CHO procedure is triggered after the CPAC procedure.