Methods and apparatuses of a mobility robustness optimization mechanism for a conditional handover procedure

Abstract

Embodiments of the present application relate to methods and apparatuses for a mobility robustness optimization (MRO) mechanism for a conditional handover (CHO) procedure. According to an embodiment of the present application, a method can include: receiving CHO configuration information for a user equipment (UE), wherein the CHO configuration information is associated with one or more CHO candidate cells and includes a set of execution conditions corresponding to the one or more CHO candidate cells; performing a handover (HO) procedure associated with a target cell, in response to receiving a handover command from a source cell or performing a CHO procedure associated with a CHO candidate cell, in response to meeting an execution condition of the CHO candidate cell; starting a timer for HO procedure or CHO procedure; and in response to successfully accessing the target cell or the CHO candidate cell, stopping the timer and transmitting assistant information to the target cell or the CHO candidate cell. In response to failing to perform the HO procedure or the CHO procedure, the UE performs a re-establishment procedure and selects one cell. If the selected cell is CHO candidate cell, the UE performs a CHO procedure and stores the information regarding whether an execution condition for each of the one or more CHO candidate cells is met or not.