Method and apparatus for registration and protocol data unit session establishment for onboarding of user equipment in mobile communication system

An access and mobility management function (AMF) in a mobile communication system for registering a user equipment (UE) and establishing a session in a standalone non-public network (SNPN), the AMF comprising:

• a transceiver configured to communicate with other network functions of the SNPN and the UE;
• a memory;
• and
• at least one processor,
• wherein the at least one processor is configured to:
• receive, from the UE through a base station, a registration request message including an onboarding indication, an onboarding subscriber concealed identifier (SUCI) set to SNPN onboarding, and default UE credentials,
• select a session management function (SMF) to establish a restricted protocol data unit (PDU) session for remote provisioning of the UE,
• transmit, to the selected SMF, a PDU session establishment request message,
• receive, from the selected SMF, a PDU session establishment response message including information indicating PDU session establishment acceptance and a PDU session identifier (ID), and
• transmit, to the UE through the base station, a message indicating UE registration and PDU session establishment acceptance.