IMS, What,Why and When?

Publication Date	August 2005
Publisher	ARCchart
Product Type	Report
Pages	80
ISBN Number	not applicable
Product Code	ARC00002

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Summary

The IP Multimedia Subsystem (IMS) is a standard for negotiating connections intended to carry multimedia content over IP (Internet Protocol) networks. The simplicity of this definition belays both the complexity of the standard, and the impact its adoption will have on the telecommunications industry and beyond. By providing a standard communications infrastructure based on the ubiquitous IP transport layer, IMS offers the opportunity to converge voice and data services, as well as video calling and even television. While the standard is proposed and managed by the cellular industry, this report shows that it is the fixed-line and cable TV operators who will be amongst the first to feel the benefits of its adoption. This report provides a detailed examinamination of IMS and how the standard is implemented at the network level. Topics of coverage include:

The network challenges facing operators today
The Mobile applications challenges facing operators today
Evolution of the IMS standard
Elements of an IMS network
The role of SIP
Transitioning to IPv6
IMS applications usage scenarios
IMS and Presense
Security and Roaming in an IMS world
IMS applications on the handset

Answers and opinions are provided with respect to the following essential questions:

What benefits does IMS deliver to network operators?
How will operators transition to a full IMS architecture?
How will networks transition from IPv4 to IPv6
Who is best positioned to manage user identities?
What are the threats facing operators in an all-IP world?
How will roaming between IMS and non-IMS networks work?
What will be the impact of IMS on equipment vendors and network operators?
What new services and business models will IMS facilitate?

Content

1 INTRODUCTION
- 1.1 The need for change
- 1.2 The danger of silo solutions
- 1.3 Customer demands
- 1.4 Future services
2 THE EVOLUTION OF CELLULAR DATA SERVICES
- 2.1 Digital networks
- 2.2 Provisioning IP
  - IP Network infrastructure
  - IP services
  - IP application architecture
- 2.3 IP convergence
  - Mobile identities
3 WHAT IS IMS?
- 3.1 The IMS standard
  - The evolution of IMS
  - Standard ownership bodies
  - Third Generation Partnership Project
  - Third Generation Partnership Project 2
  - Internet Engineering Task Force
  - Open Mobile Appliance
  - GSMA
- 3.2 IMS versions
  - 3GPP2 IMS
  - Release 6, Phase 2
  - Release 7
4 IMS USAGE SCENARIO
- 4.1 Usage scenario break-down
  - Registering on the network
  - Standard voice call
  - Adding video
  - Presence
  - Calling outside the cellular network
  - Instant access to new services
  - Sending a text message
  - The IP Multimedia Subsystem - What, Why and When?
  - Accessing Premium Services
  - Setting Presence information
- 4.2 What can already be done
  - Presence and instant messaging
  - VoIP services
  - Skype
  - Network games
5 SECURITY AND ROAMING
- The ISIM
- UE to the network
- Internal messaging
- Inter-network security
- Stream security
- 5.2 Roaming
6 WHY IMS?
- 6.1 IMS opportunities
  - Cost reduction
  - Faster application roll-out
  - Flexible infrastructure
  - Fixed service integration
7 IMS CONCERNS
- 7.1 Device availability
  - Device application integration
  - Java IMS APIs
- 7.2 Bandwidth overhead
- 7.3 To IPv6 or not to IPv6?
  - Addressing issues
  - The NAT problem
  - Ways of combining IPv4 and IPv6
  - IPv4-only handsets
  - IPv4 and IPv6 in parallel
  - IPv6-only handsets
  - Towards an IPv6 future
  - Summary
  - IP for All
- 7.4 A Question of identity
  - Definition: Identity
  - How many identities?
  - Challenges of Calling Party Pays (CPP)
  - Separate handsets, separate identities
  - Hosting services
  - The IP Multimedia Subsystem - What, Why and When?
  - iv
  - The Future identity market
8 BILLING
- 8.1 Identifying billing models
  - Event based billing
  - Volume based billing
  - Duration based billing
  - Subscription based billing
- 8.2 Implementing billing models
  - Event based billing
  - Volume based billing
  - Duration based billing
  - Subscription based billing
9 IMS AND THE INFRASTRUCTURE VENDORS
- 9.1 Hardware and infrastructure suppliers
  - Infrastructure servers
  - Ericsson
  - Motorola
  - Lucent
  - Nokia
  - Alcatel
  - Siemens
  - Application servers
10 IMS AND THE OPERATORS
- The changing role of the network operator
- 10.2 Mobile Network Operators
  - Messaging revenues
  - Competitive services
  - Cost reduction opportunities
  - Resourcing IP skills
  - Deployment plans
- 10.3 Fixed network operators
  - DSL providers
  - Cable providers
- 10.4 Pure service providers
  - Yahoo
  - Microsoft
  - America Online
- 10.5 Alternative approaches
  - Integrating silo solutions
- 10.6 Summary
  - Service provider or network provider?
  - The IP Multimedia Subsystem - What, Why and When?
  - We don't need to do deals
  - We're a mobile company
  - New profit centres
11 GLOSSARY
- The IP Multimedia Subsystem - What, Why and When?
List of Figures
- Figure 1 - Data contribution to revenues for selected operators: Q1 2005
- Figure 2 - The WAP service model
- Figure 3 - Fixed and mobile IMS network integration
- Figure 4 - Mobile customer roaming into a fixed network
- Figure 5 - Fixed IMS customer roaming to a mobile network
- Figure 6 - Standard's ownership bodies
- Figure 7 - IMS device registration
- Figure 8 - IMS voice call connection
- Figure 9 - Adding video to an IMS connection
- Figure 10 - IMS Presence registration
- Figure 11 - Mobile to fixed calling
- Figure 12 - Accessing premium services
- Figure 14 - Roaming to other IMS networks
- Figure 15 - Network Address Translation
- Figure 16 - IPv6 handsets on an IPv4 network
- Figure 17 - IPv6 connections on an IPv4 network
- Figure 18 - Provider-based aggregation
- Figure 19 - Third-party-based aggregation
- Figure 20 - UE-based aggregation
- Figure 21 - Offline billing (post pay)
- Figure 22 - Online billing (pre pay)
- Figure 23 - A typical operator IMS deployment schedule