Method and apparatus for supporting reauthentication of dn authorized pdu session and managing pdu session according to change of dn authorization data

A method performed by a second network entity performing a data network authentication, authorization and accounting (DN-AAA) in a mobile communication system, the method comprising:

• identifying an initiation of a re-authentication for a protocol data unit (PDU) session;
• and
• transmitting, to a first network entity performing a session management function (SMF), a data network (DN) authorization profile index for the PDU session, during the re-authentication,
• wherein a message for requesting a policy control for the PDU session is transmitted from the first network entity to a third network entity performing a policy control function (PCF), in case that the transmitted DN authorization profile index changes a DN authorization profile index associated with an authentication for the PDU session, and
• wherein the message includes the transmitted DN authorization profile index.

A first network entity performing a session management function (SMF) in a mobile communication system, the first network entity comprising:

• a transceiver;
• and
• a controller configured to:
• identify an initiation of a re-authentication for a protocol data unit (PDU) session,
• receive, from a second network entity performing a data network authentication, authorization and accounting (DN-AAA) via the transceiver, a data network (DN) authorization profile index for the PDU session, during the re-authentication, and
• transmit, to a third network entity performing a policy control function (PCF) via the transceiver, a message for requesting a policy control for the PDU session, in case that the received DN authorization profile index changes a DN authorization profile index associated with an authentication for the PDU session,
• wherein the message includes the received DN authorization profile index.

A second network entity performing a data network authentication, authorization and accounting (DN-AAA) in a mobile communication system, the second network entity comprising:

• a transceiver;
• and
• a controller configured to:
• identify an initiation of a re-authentication for a protocol data unit (PDU) session, and
• transmit, to a first network entity performing a session management function (SMF) via the transceiver, a data network (DN) authorization profile index for the PDU session, during the re-authentication,
• wherein a message for requesting a policy control for the PDU session is transmitted from the first network entity to a third network entity performing a policy control function (PCF), in case that the transmitted DN authorization profile index changes a DN authorization profile index associated with an authentication for the PDU session, and
• wherein the message includes the transmitted DN authorization profile index.