IMS Architecture and Services

Contents:

The course explains the IMS Architecture and Concepts as it is standardised in 3GPP. Nodes interfaces and protocols for IMS are introduced also concepts for QoS and Charging, PCC are examined. Furthermore IMS/IP based services are explored and explained in detail by showing traces from real-life traffic cases. The course outlines different aspects of Troubleshooting and optimisation issues for service-, creation, Quality, verification and testing. The course provides knowledge of fundamental concepts for different measurement tools and parameters for IP-based services in the Mobile World and IMS through theory combined with hands-on exercises.

Log-File Analysis and Exercises:

Every chapter (when available) and topic covered in the course is described in detail by looking at log-files collected from the live networks.

The exercises include calculation, observation and validation of key parameters and are designed to give more understanding on the topics. No additional equipment needed.

Pre-Requisites:

General knowledge about mobile networks and networking concepts is recommended. For background knowledge, we recommend the APIS course GSM/UMTS/EPS System Overview and TCP/IP in the Mobile Networks.

Network Overview

• General mobile networks architecture

• Introduction to the two major parts of wireless networks: access and core network and their respective functions and characteristics

• Comparison of PS and CS networks as an explanation of the current trend to switch over to IP-based solutions and services

TCP/IP Protocol Suite

• IP addressing and routing (IPv4 & IPv6)

• Functions of Transport Protocols (UDP, TCP and SCTP)

• Applications in IP Protocol Suite (DHCP, RADIUS, DNS, NAT, ...)

Multimedia over IP with SIP

• Codec and codec characteristics

• SIP methods, headers and responses

• SDP attributes with QoS

• RTP and RTCP functions and characteristics

IMS Architecture and Concepts

• Introducing the IP Multimedia Core Network Subsystem, IMS, using Session Initiation Protocol, SIP, for call control

• IMS Procedures, REGISTRATION and INVITATION

• The IMS Architecture

• IMS Concepts (Identities, Service Provisioning, PCC, Mechanisms for controlling bearer resources)

• IMS Interaction with Service Networks

• New nodes, interfaces and protocols including the S-, I-, P-CSCF, BGCF, MRF and the MGCF

IMS Services

For each service the following topics are covered:

• Architecture for service provisioning

• Protocol in use

• Troubleshooting Parameters

• Optimisation Parameters

Presence

• Presence in IMS

• Publishing/Subscribing Presence

• Presence-Enhanced Services

Group Management

• What is Group Management

• XCAP

• Common Policy

• Resource List

• Multimedia Telephony and Service Management

Push to Talk Over Cellular

• PoC Architecture

• PoC Server/Client

• Poc Features (Sessions, Incoming, Simultaneous, Instant, Alert, etc)

• PoC User Plane

Messaging

• IMS Messaging

• Instant Messaging by OMA

• Immediate Messaging/Session Based Messaging

Conferencing

• IMS Conferencing Architecture and Principals

• IMS Conferencing Procedures

• Multimedia Telephony

• SIP and IMS Multimedia Telephony

• ICSI and TAS

• Supplementary Services (Barring, Diversion, Hold, Message wait, etc)

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