A UE-RRC layer may receive an RRC reconfiguration message with reconfiguration sync information element (IE) or mobility control information from a base station. Based on the RRC reconfiguration message, the UE may perform a random access procedure to a base station indicated in the reconfiguration sync IE or mobility control information in the RRC reconfiguration message. Based on the random access procedure being successfully completed, the UE may send an RRC reconfiguration complete message to the base station. The UE and the base station may consider sending/receiving the RRC reconfiguration complete message successfully as reconfiguration with sync completion. The reconfiguration with sync completion may include at least one of handover completion or PSCell addition for cell group addition.