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Diameter and Diameter Roaming

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Presentation from December 18, 2002 on Diameter and it's use in 3G networks

Presentation from December 18, 2002 on Diameter and it's use in 3G networks


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  • 1. Diameter and Diameter Roaming John Loughney Research Manager Nokia Research Center john.loughney@nokia.com1 © NOKIA diam-roam.PPT/ 18 December 2002 / John A. Loughney
  • 2. AAA & Diameter • Next generation Authentication, Authorization & Accounting protocol • Consists of base specification and applications • MIP • Network Access Server (Dial-up / PPP / SLIP environment) • SIP Services • Accounting Extensions2 © NOKIA diam-roam.PPT/ 18 December 2002 / John A. Loughney
  • 3. Standard RADIUS Model3 © NOKIA diam-roam.PPT/ 18 December 2002 / John A. Loughney
  • 4. Diameter Roaming4 © NOKIA diam-roam.PPT/ 18 December 2002 / John A. Loughney
  • 5. How It Works • The user requests service from the remote ISP, which in tern requests the user’s credentials. • The user submits ID, password and address of his home- agent. The remote server performs mutual authentication with the home-agend and forwards the user’s credentials. • The home-agent accepts the user’s credentials and then tells the remove ISP to grant access to the user. • Subsequently, the two ISPs update their call accounting records.5 © NOKIA diam-roam.PPT/ 18 December 2002 / John A. Loughney
  • 6. AAA Elements • Diameter Node • A host that implements the Diameter protocol, and acts either as a Client, Agent or Server. • Broker • A business term used in AAA infrastructures. A broker is either a relay, proxy or redirect agent, and operated by roaming consortiums. • Diameter Agent • A host that provides either relay, proxy, redirect or translation services. • Diameter Client • A device at the edge of the network that performs access control. An example of a Diameter client is a Network Access Server (NAS) or a Foreign Agent (FA). • Diameter Peer • Node to which a given Diameter Node has a direct transport connection. • Diameter Server • A server that handles authentication, authorization and accounting requests for a particular realm.6 © NOKIA diam-roam.PPT/ 18 December 2002 / John A. Loughney
  • 7. Diameter Connections and Sessions Server relay Server Peer connection A Peer connection B User session X7 © NOKIA diam-roam.PPT/ 18 December 2002 / John A. Loughney
  • 8. Translation of RADIUS to Diameter RADIUS Req Diameter Req Translation Home NAS RADIUS Ans Agent Diameter Req Server8 © NOKIA diam-roam.PPT/ 18 December 2002 / John A. Loughney
  • 9. Diameter Proxy Example local service home service provider provider Primary Primary Proxy Home Server Server Network Access Server Backup Backup Proxy Home Server Server9 © NOKIA diam-roam.PPT/ 18 December 2002 / John A. Loughney
  • 10. Diameter Extensibility • Diameter tries to preserve Radius -like flexibility • Diameter base commands and AVPs defined in the base spec • Diameter extension can define new commands and AVPs. • Examples are: • NASREQ • MOBILE-IP • 3GPP Credit Control • 3GPP Multimedia Application • New AVPs can be added10 © NOKIA diam-roam.PPT/ 18 December 2002 / John A. Loughney
  • 11. AAA-SIP in 3GPP Rel. 5 Diameter SLF HSS AS Sh Diameter ISC Dx Cx Cx Diameter Gm Mr Mw Mw UE P- I- S- MRFC CSCF CSCF CSCF Megaco Compression Mi COPS for Go SIP MRFP Policy Control GGSN Mj BGCF MGCF SGW SIP SIP-ISUP Megaco Mc Visited Home Domain Domain MGW11 © NOKIA diam-roam.PPT/ 18 December 2002 / John A. Loughney
  • 12. Work to Do • Diameter Base Specification just submitted. • Diameter Mobile IPv4 Application nearly ready (needed by 3GPP2). • Diameter NASREQ Application nearly ready. • CMS Security Application, needed for e2e security • AAA Key Distribution • SIP-AAA Requirements • Diameter Mobile IPv6 Application • Diameter Multimedia Application (3GPP rel. 6) • Diameter Credit Control Application (3GPP rel. 6)12 © NOKIA diam-roam.PPT/ 18 December 2002 / John A. Loughney
  • 13. Summary • Integrating different access technologies (3G, WLAN, DSL, Dial-up): • increases the potential for increasing subscribers. • increases accesses to services. • Integrating/harmonizing signaling: • harmonizes network infrastructure. • simplifies network management. • simplifies charging/billing. • simplifies the user experience.13 © NOKIA diam-roam.PPT/ 18 December 2002 / John A. Loughney
  • 14. More Info • http://www.diameter.org/ • I will be heading an NRC program • Access Independent AAA Infrastructure14 © NOKIA diam-roam.PPT/ 18 December 2002 / John A. Loughney