Apparatus and method for inter-PLMN handover of home routed session in wireless communication system

A method performed by a home-session management function (H-SMF) in a home public land mobile network (HPLMN), the method comprising:

• receiving, from a visited-SMF (V-SMF) in a visited public land mobile network (VPLMN), a protocol data unit (PDU) session update message including a home-routed session breakout (HR-SBO) request message and an identifier (ID) of the VPLMN after an inter-PLMN handover is performed;
• transmitting, to a unified data management (UDM), a subscriber data management (SDM) request message;
• receiving, from the UDM, an SDM response message including an authorization result for the HR-SBO;
• and
• transmitting, to the V-SMF, a PDU session update response message including an authorization result for the HR-SBO.

A visited-session management function (V-SMF) in a visited public land mobile network (VPLMN), the V-SMF comprising:

• a transceiver;
• and
• a controller configured to:
• receive, from an access and mobility management function (AMF) in the VPLMN, a protocol data unit (PDU) session create request message including an indicator for allowing a home-routed session breakout (HR-SBO) and an identifier (ID) of the VPLMN after an inter-public land mobile network (PLMN) handover is performed,
• transmit, to a home-SMF (H-SMF) in a home PLMN (HPLMN), a PDU session update request message including the ID of the VPLMN and an HR-SBO request message, and
• receive, from the H-SMF, a PDU session update response message including an authorization result for the HR-SBO.

A home-session management function (H-SMF) in a home public land mobile network (HPLMN), the H-SMF comprising:

• a transceiver;
• and
• a controller configured to:
• receive, from a visited-SMF (V-SMF) in a visited PLMN (VPLMN), a protocol data unit (PDU) session update message including a home-routed session breakout (HR-SBO) request message and an identifier (ID) of the VPLMN after an inter-public land mobile network (PLMN) handover is performed,
• transmit, to a unified data management (UDM), a subscriber data management (SDM) request message,
• receive, from the UDM, an SDM response message including an authorization result for the HR-SBO, and
• transmit, to the V-SMF, a PDU session update response message including an authorization result for the HR-SBO.