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Course outline

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Contents

IMS as a generic platform designed to control and handle a variety of services accessible over several possible access networks is explained. The course does shortly introduce the different possible IP IMS as a generic platform designed to control and handle a variety of services accessible over several possible access networks is explained. The course shortly introduces the different possible IP Connectivity Access Networks (IP-CANs) that IMS can handle, but is mainly access-agnostic. There is a definite focus on the mobile access option from the 3GPP standards – mainly 4G and 5G – with mainly the telephony (VoLTE/Vo5G) service used as an example.

The course presents the benefits of deploying IMS control: service availability and subscription verification, session handling, security, charging. Session establishment, modification, and release, together with the policy management for resources within the used IP-CAN are discussed. Mobility-related and roaming considerations for mobile/nomadic devices are also presented.

Note: This course is not delivered with the FoldOut methodology.

Prerequisites

GenGeneral technical knowledge of the fixed and mobile telecommunication technology is beneficial.

IMS Architecture

  • Roles and functions of IMS Core, Policy Manager (PM), Subscription Database (SD)
  • Role and functions of the different types of Call Session Control Functions (CSCF): Proxy CSCF, Interrogating CSCF, Serving CSCF
  • Interaction with non-IMS networks: roles and functions of Signalling Gateway (SG), Border Gateway (BGW), Media Gateway (MGW), Breakout Gateway Control Function (BGCF), Media Gateway Control Function (MGCF)
  • User Equipment (UE) and Application Server (AS) as Application endpoints
  • Basic IMS connectivity scenarios: UE ↔ AS, AS ↔ AS, IMS ↔ non-IMS user
  • Responsibilities of IMS Core functions in roaming scenarios

IMS Procedures

  • IMS Subscription identification: IMS Public User Id (IMPU), IMS Private User ID (IMPI)
  • Service handling settings: Service Profile, initial Filter Criteria
  • IMS Signalling: Session Initiation Protocol (SIP), Diameter and HTTP protocols
  • Basic IMS traffic cases: IMS Registration, Originating and Terminating Session Setup
  • Establishment of User Plane resources with the support of the Policy Manager

Policy Management in IMS

  • Policy and Charging Control in IMS, PCC
  • Roles of the Policy Manager, especially the Policy and Charging Rules Function (PCRF) and Policy Control Function (PCF), including the division into Home and Visited network responsibilities in roaming scenarios
  • Quality of Service Class Identifier (QCI) and 5G Quality of Service Identifier (5QI) values for resource definition in 4G and 5G as the IP-CAN

IMS Security

  • Security procedures for UE authentication and authorization: IPCAN security, 5G slice security, IMS security,
  • IMS Authorization and Key Agreement (AKA) as the IMS access security

This course presents the architecture and functionalities of the IP Multimedia Subsystem (IMS) as defined in the current R17 3GPP standards.

Interested in IMS Architecture?

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