Mobility management for RRC_INACTIVE user equipment

A base station for a radio access network (RAN) based notification area (RNA) update, the base station comprising:

• at least one memory storing a set of instructions;
• and
• at least one processor coupled to the at least one memory, the at least one processor configured to execute the set of instructions to:
• transmit first identification information of a second cell to a radio resource control (RRC)_INACTIVE user equipment (UE) in an RRC_INACTIVE state, the first identification information including a RAN area identity (ID) of the second cell and a cell ID of the second cell;
• and
• receive, from the RRC_INACTIVE UE in the RRC_INACTIVE state, second identification information of a first cell during a 4-step random access procedure of an RNA update procedure with the RRC_INACTIVE UE in the RRC_INACTIVE state, wherein
• a Message 3 (MSG3) of the 4-step random access procedure includes the second identification information.

A user equipment (UE) in a radio resource control (RRC)_INACTIVE state for performing a radio access network (RAN) based notification area (RNA) update, the UE comprising:

• at least one memory storing a set of instructions;
• and
• at least one processor coupled to the at least one memory, the at least one processor configured to execute the set of instructions to:
• receive a first list of RAN area identities (IDs) from a first cell;
• receive first identification information broadcast by a second cell, the first identification information including a RAN area ID of the second cell and a cell ID of the second cell;
• and
• perform a 4-step random access procedure with the second cell to transmit second identification information to the second cell after determining that the RAN area ID of the second cell does not belong to the first list of RAN area IDs, wherein
• a Message 3 (MSG3) of the 4-step random access procedure includes the second identification information.