name: AAA
full_form: Authentication Authorisation Accounting
context: shall have assurance of the origin of this information. The exact details of how to achieve this are not covered in this specification. The HSS shall check if there is a 3GPP AAA Server already registered to serve for this subscriber. In case the HSS detects that another 3GPP AAA Server has already registered for this subscriber, it shall provide the current 3GPP AAA Server with the previously registered 3GPP AAA Server address. The authentication signalling is then routed to the previously registered 3GPP AAA Server with Diameter-specific mechanisms, e.g., the current 3GPP AAA Server transfers the previously registered 3GPP AAA Server address to the 3GPP AAA proxy or the AAA entity in the trusted non-3GPP access network, or the current 3GPP AAA Server acts as a AAA proxy and forwards the authentication message to the previously registered 3GPP AAA Server. 11. Void. NOTE 8: Void. 12. New keying materials MSK and EMSK are derived from CK' and IK' according to RFC 5448 [23]. NOTE 9: The
description: The Authentication, Authorization, Accounting (AAA) Server is a network function responsible for managing user authentication, authorization, and accounting in the 3GPP network. It plays a crucial role in ensuring secure access to network resources by verifying user identities and permissions.
explanation: AAA is classified as a Network Function based on its role in handling user authentication, authorization, and accounting within the network.
section_title: 6.2	Authentication and key agreement for trusted access
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