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The IMS AAA Server is a multi-protocol, AAA server that enables 2G/3G GSM/UMTS mobile operators to support 3GPP WLAN services including UMA (Unlicensed Mobile Access), Femtocell and IMS (Release 6) based I-WLAN. The IMS AAA Server performs SIM-based (Subscriber Identity Module) authentication, subscription authorization, and accounting (AAA) in 3GPP WLAN Interworking environments where the primary subscriber database is a Home Subscriber Server (HSS).

This chapter covers the following topics:

The IMS AAA Server supports both the RADIUS and Diameter protocols which are both industry standard methods for providing authentication, authorization, and accounting (AAA) services:

The IMS AAA Server performs the AAA functions of the 3GPP AAA Server/Proxy referenced in 3GPP TS 23.234: 3GPP System to Wireless Local Area Network (WLAN) Interworking; System Description in networks that support IMS Release 6.

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