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Duration: 3 days onsite or 5 mornings online

Diameter is the successor to RADIUS and the current AAA (Authentication / Authorization / Accounting) protocol used in many telecommunication environments like IMS and SAE. Especially its highly flexible approach, real-time credit-control, and the additional support of various interfaces make it the preferred AAA solution in today’s mobile networks. It is used on a variety of interfaces for numerous functions like subscriber/location information transport, negotiation of bearer establishment or charging.

Within this course you get a good understanding of the Diameter protocol and its application in mobile networks. The focus is mainly on LTE/SAE and IMS.

Target Group

The course is addressed to technical staff to get a good overview about the DIAMETER protocol and its use in mobile networks.

Course Content

Register 1 - Introduction

DIAMETER overview 

• Introduction to AAA
• Comparison RADIUS / DIAMETER
  • Limitations of RADIUS
  • DIAMETER as single protocol in packet based networks
• DIAMETER functions overview
  • Registration
  • Quality Control
  • Charging
• DIAMETER protocol structure overview
  • Base protocol
  • Application protocols

Network comparison today – future

• Overview of legacy mobile networks (2G/3G/4G)
  • Network architecture and interfaces
  • Legacy protocols in use
• Overview of future mobile networks (all IP infrastructure)
  • Network architecture and interfaces
  • Use of DIAMETER in future networks
  • LTE: MME, HSS, P-GW, PCRF, OCS, EIR
  • 2G/3G packet: GGSN, eRADIUS
  • IMS: CSCF, HSS, SLF, Charging GW
  • DIAMETER terminology

Register 1 - Registration

Registration overview

• Mobile network architecture, interfaces and protocols
• General registration view
• Application Protocol for Registration

Registration message structure and message flow

• Example message structure “Authentication Information Request (AIR)”
• Example message flow MME – HSS
• Message formats in detail
  • AIR / AIA (Authentication)
  • ULR / ULA (Update)
  • CLR /CLA (Cancel)
• Message command description
• Capability Exchange, Device Watchdog, Disconnect Peer
• Re-Authentication, Abort Session, Session Termination

Error handling

• General principles
• Result code AVP
  • Informational
  • Success
  • Protocol Errors
  • Transient Failures
  • Permanent Failures

DIAMETER on the Gi interface

• 2G / 3G network overview
• eRADIUS for AAA

IMS specific DIAMETER registration

• IMS network architecture, interfaces and protocols
• Example message flow CSCF – HSS
• Message formats in detail
  • UAR / UAA (User)
  • MAR / MAA (Multimedia)
  • LIR / LIA (Location)
  • RTR / RTA (Registration Termination)

Register 3 - DIAMETER Routing

Components of DIAMETER architecture

• Routing based on DIAMETER
• DIAMETER connections and sessions
• DIAMETER Routing Agent (DRA)
• Specific DIAMETER Agents
  • Relay Agent
  • Proxy Agent
  • Redirect Agent
  • Translation Agent

DIAMETER load sharing and redundancy

• SCTP / TCP as layer 4 protocols
• SCTP signalling paths
• DIAMETER gateway functionalities – Signalling Transfer Point
• Routing bases on base and application protocol
• Application protocol translation
• Multi homing and load sharing scenarios
• Redundancy scenarios
• Security aspects
• Signalling example MME – DRA – HSS

Roaming

• DIAMETER non-Roaming / Roaming scenarios
• DIAMETER Roaming Gateway

Register 4 - Quality Control

Quality control overview

• Mobile network architecture, interfaces and protocols
• PCRF as central policy and charging controller

Quality control message structure and message flow

• Example message structure “Credit control request – initial (CCR–initial)”
• Example message flow PDN-GW – PCRF
• Message formats in detail
  • CCR / CCA (Credit Control)
  • Initial / update / termination

Quality control signalling in LTE

• Complete picture of message exchange
• Gx interface / application

Quality control signalling in IMS

• Complete picture of message exchange
• Rx interface / application

Register 5 - Charging

DIAMETER charging overview

• Mobile charging architecture, interfaces and protocols
• Charging in LTE and IMS
• Online charging (Gy interface)
• Charging gateway via Ga interface for offline charging
• Example message flow

Diameter credit control application (DCCA)

• DCCA basics
• DCCA architecture model
• Credit control messages (CCR / CCA)

Session based credit control

• General principles
• Credit control for multiple services within a session

One time event

• Direct debiting
• Balance check
• Refund

Credit control AVPs and result codes

• Credit control AVPS
• Result code AVP values

DCCA supplementary

• Failure handling
• Tariff time change

IMS Charging

• IMS charging network architecture, interfaces and protocols
• Charging control function
• ACR / ACA (Accounting)

Certification

Certificates are given to all participants at the end of the course about the successful completion.