Method and apparatus for managing cag related procedure in wireless communication network

A method for performed by a user equipment (UE), in a wireless communication network, the method comprising:

• receiving, from an access and mobility management function (AMF) entity, a non-access stratum (NAS) message including a CAG information list for a change of CAG information;
• and
• replacing an existing CAG information list stored in the UE with the received CAG information list, in case that a serving public land mobile network (PLMN) of the UE is a home PLMN (HPLMN), and
• replacing only CAG information associated with the serving PLMN, other than CAG information that is not associated with the serving PLMN, in the existing CAG information list stored in the UE with CAG information associated with the serving PLMN in the received CAG information list, in case that the serving PLMN is a visitor PLMN (VPLMN) other than the HPLMN.

An access and mobility management function (AMF) entity in a wireless communication network, the AMF entity comprising:

• a communicator;
• a memory;
• and
• a controller coupled to the communicator and the memory, and configured to:
• receive, from an unified data management (UDM) entity belonging to a home public land mobile network (HPLMN), a closed access group (CAG) information list for a change of CAG information, and
• transmit, to user equipment (UE), the CAG information list based on the CAG information,
• wherein the CAG information list comprises a complete CAG subscription information associated with a plurality of PLMNs, in case that a serving PLMN of the UE is the HPLMN, and
• wherein the CAG information list comprises CAG subscription information associated with the serving PLMN only, in case that the serving PLMN of the UE is a visitor PLMN (VPLMN) other than the HPLMN.

A user equipment (UE) in a wireless communication network, the UE comprising:

• a communicator;
• a memory;
• and
• a controller coupled to the communicator and the memory , and configured to:
• receive, from an access and mobility management function (AMF) entity, a non-access stratum (NAS) message including a CAG information list for a change of CAG information, and
• replace an existing CAG information list stored in the UE with the received CAG information list, in case that a serving public land mobile network (PLMN) of the UE is a home PLMN (HPLMN), and
• replace only CAG information associated with the serving PLMN, other than CAG information that is not associated with the serving PLMN, in the existing CAG information list stored in the UE with CAG information associated with the serving PLMN in the received CAG information list, in case that the serving PLMN is a visitor PLMN (VPLMN) other than the HPLMN.