1. Next Generation Networks (NGN) & the IP Multimedia Subsystem (IMS)
Kevin Sutherland
Manager
Communications Engineering Section
International Training Program
07 September 2006

2. What is NGN?...
A concept for a framework for evolution of network architecture and capabilities, as defined by ITU-T Recommendations
ITU-T SERIES Y: GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS AND NEXT-GENERATION NETWORKS
Next Generation Networks – Frameworks and functional architecture models
Y.2001 (12/2004) General overview of NGN
Y.2011 (10/2004) General principles and general reference model for Next Generation Networks

3. NGN Definition from Y.2001 Next Generation Network (NGN):
a packet-based network able to provide telecommunication services and able to make use of multiple broadband, QoS-enabled transport technologies and in which service-related functions are independent from underlying transport-related technologies.
It enables unfettered access for users to networks and to competing service providers and/or services of their choice. It supports generalized mobility which will allow consistent and ubiquitous provision of services to users.

4. NGN Definition cntd… Practical Description …from ETSI
The convergence of the public switched telephone network, the (PSTN) voice network, the wireless networks (WiFi / WiMAX / GSM / UMTS) and the data networks (Internet)
and broadcasting networks & services ?...
Convergence in the Dictionary
from the Latin verb “convergere”, i.e. to ‘incline’ together
convergence is a coming together of two or more distinct entities or phenomena
Convergence in Technology
the combination of two or more different technologies in a single device – e.g. taking photos with a mobile phone, reading s on a refrigerator, TV on your PC or internet on your TV…

5. Convergence… new multimedia devices
Source:

6. NGN key characteristics
A concept, not just a technology
Use packet-based data transfer (IP, ATM)
Use multiple broadband, QoS enabled transport technologies
Independence of service-related functions from underlying transport-related functions, implying open interfaces
Interworking with legacy networks
Supports generalised mobility, with presence/location information
Unrestricted access by users to different services and/or service providers
Converged services between Fixed/Mobile networks
Meet all Regulatory requirements, e.g. emergency communications, security/privacy, lawful interception etc.

7. Existing Telecommunications
Services
Transport
& Access
Benefits:
Worked well for stand-alone systems
Challenges:
Many Networks = High Operational and Interworking Costs
Slow to introduce new services
Users require different devices for different services
Difficult to integrate new services or technologies
Source: ASTAP05/WS-IP&NGN/13

8. Emerging Telecommunications
Access
Transport
Services
Internet Protocol
Benefits:
Rapid Service Deployment = New Service Revenues
Allow continued growth of the network
Flexible architecture for future growth and new technologies
Allows for competition at individual layers
Challenges:
Legacy policy frameworks are challenged by the emerging telecommunications model throughout the world
Services and access technologies only need to interface to the common transport layer (IP)
Source: ASTAP05/WS-IP&NGN/13

9. Access and Service Independence
video
data
voice
dsl
wi-fi
cable
video
data
voice
dsl
wi-fi
cable
Internet Protocol
IP provides a common interface for access and services
One point of interface simplifies the introduction of new devices and services.
Each service must be integrated to a specific access technology.
With many services converging it becomes complex to integrate single access.
Source: ASTAP05/WS-IP&NGN/13

10. Networks in Transition
Lower cost and innovative services drives network convergence
Toll Bypass
PSTN IP
Corporate
Video
PSTN
Services
Wireless
Voice
WWW
IP Core
Broadcast
CATV
MPEG IP
PSTN
Academic
Corporate
WWW IP
Broadband
1G-2G
GSM
CDMA IP
Source: ASTAP05/WS-IP&NGN/13

11. One schematic view of NGN…
Services
WEB
VoD
MMS
SIP
E911
ASP
Network
ASP
Network
IMS
PSAP
Network
Transport
Core IP/MPLS Networks
Wi-Fi
DSL
GSM
PSTN
DOCSIS
Access
User
Source: ASTAP05/WS-IP&NGN/13

12. Driving forces for NGNs
Europe
Ageing networks in need of new equipment
Cost savings, new services
North America
Cost savings, new services, competitiveness
Operators: IP core conversion, fixed-mobile convergence,
new service offerings (VoIP, IP-TV)
Asia Pacific Region
Mobile users, less investment in legacy infrastructure, new services,
address space limitations, government NGN initiatives
Role-out of new networks in the countries in economic transition
Source: ASTAP05-FR10-PL-30

13. NGN VoIP PSTN Policy implications…. Core policy areas: Consumer issues
Security
Regulation of
“Standard Telephone
Service”
Privacy
Consumer awareness
NGN
Quality of
Service
Numbering
VoIP
Emergency
PSTN
Competition
Jurisdiction
“Next Generation”
Longer term issues
Core policy areas:
Consumer issues
Competition
Security
Scope for self-regulation
Short term issues
Policy implications….
Source: ASTAP05_WS.IP&NGN-09

14. ACCESS? INNOVATION SECURITY? INTEROPERABILITY?
Source: ASTAP05_WS.IP&NGN-09

15. Access, security & interoperability
spam
National security
ACCESS
Pay TV
SME E-commerce
SECURITY
WiFi WiMAX
PSTN, NGN, 3G E-banking
E-tax
Free-to-air & Satellite b/c
E-business, Managed networks,
Corporate networks
SMS
IP TV, PVR
Office systems
INTEROPERABILITY
Intranets
Source: ASTAP05_WS.IP&NGN-09

16. IDENTITY, NUMBERING, ADDRESSING
STANDARDS
ACCESS
INTEROPERABILITY
Consumer
Competition
Security
Emergency
Quality of Service
Rights of redress
Directories
Privacy
Information
Choice
Special needs
Universal service
Convergence
Bundling
Bottlenecks
Interconnection &
access
Carrier selection
Number portability
Migration
Investment
Critical Infrastructure
Viruses & firewalls
Network attack
Disaster recovery
Lawful Interception
Cybercrime
Misuse
Jurisdiction,
collaboration &
standards
IDENTITY, NUMBERING, ADDRESSING
Source: ASTAP05_WS.IP&NGN-09

17. Areas of interest for NGN standards activity
International Telecommunications Union (ITU-T)
Study Groups (SG13 lead SG for NGN)
Telecommunication Standardization Advisory Group (TSAG)
NGN Global Standards Initiative (NGN-GSI), since Jan 2006
Built on NGN 2004 Project, Focus Group (FGNGN)
European Telecommunications Standards Institute (ETSI)
TISPAN, 3GPP / IMS
Internet Engineering Task Force (IETF)
Protocols (IP, SIP, MGCP, ENUM, etc)
Global Standards Collaboration (GSC)
Asia-Pacific Telecommunity (APT)
ATP Standardisation Program (ASTAP), NGN Expert Group
Asia-Pacific Economic Cooperation (APEC) Telecommunications and Information Working Group APEC TEL

18. Defining Standards
Smaller industry fora have helped shape international standards.
IETF have developed many of the core NGN technologies (IP, MPLS, SIP, etc.)
3GPP integrated IP-based technologies into an instantiation of the NGN, IP Multimedia Subsystem (IMS)
Release based (ETSI TISPAN r1, 3GPP r7, ITU NGN r1-3)
ITU involvement is necessary at the international level to define an Evolutionary Framework to help solve interworking, mobility and service definitions issues, but…
There could be more pro-active cooperation between the ‘telco’ and internet stakeholders…

19. ITU-T Structural model of Functional components
Ref:

20. Current coverage of FGNGN Release 1
Ref:

21. ITU-T releases

22. Continuing ITU-T Work NGN Focus Group (FGNGN) scope complete Nov05
Work continues in the various ITU-T Study Groups according to their allocated tasks (Questions)
SG 13 has a continuing (and lead) NGN Role
The ITU-T has announced a “NGN Global Standards Initiative (NGN-GSI)” with the Goal “to further strengthen the ITU-T’s leading role in NGN standard work”

23. The ETSI NGN Vision
Mobile/Fixed Convergence, based on the “IMS” platform
A multi-service, multi-protocol, multi-access, IP based network - secure, reliable and trusted
Multi-services: delivered by a common QoS enabled core network.
Multi-access: diverse connectivity networks; fixed and mobile terminals, (Mobile, xDSL, etc)
Not one network, but different networks that interoperate seamlessly
Mobility / Nomadicity of both users and devices
“My communications services”
anywhere, any terminal, anytime
>>> all of this leads to a true Next Generation Network
Source: ASTAP05-WP.IP&NGN-08_ETSI

24. What is IMS? IP Multimedia Subsystem as defined by 3GPP
3GPP IMS standards define a network domain dedicated to the control and integration of multimedia services.
IMS is defined by 3GPP from Release 5 onwards (2002)
3GPP2 equivalent of IMS is the MMD (MultiMedia Domain), fully interoperable with 3GPP IMS
IMS builds on IETF protocols
Based upon SIP, SDP, COPs and Diameter protocols
3GPP have enhanced these IETF protocols for mobility
IMS in short
Open-systems architecture that supports a range of IP-based services over the PS domain, employing both wireless and fixed access technologies

25. What does IMS provide? Services and Control Media Mixing
Adds call session control to the packet network (GPRS)
enables peer-to-peer real-time services - such as voice, video – over a packet-switched domain
scalable common service control (based on SIP) gives the ability to manage parallel user services
Media Mixing
Ability to pick and mix various multimedia flows in single or multiple sessions
Can handle real-time voice, video, data
Connectivity Network Independence
Provides access to IP based services independent of the underlying connectivity technology (mobile / fixed)
IMS is based upon an open standard with a strong evolutionary advantage
IMS architecture & SIP may be easily extended to provide for new services

26. IMS basic components UE Visited Network Home Network SLF AS HSS P-CSCF
CSCF – Call State Control Functions P – Proxy I – Interrogating S – Serving UE – User Equipment SLF- Subscriber Location Function HSS- Home Subscriber Server AS – Application Server
SLF
HSS AS
Diameter Protocol
SIP Protocol UE
P-CSCF
I-CSCF
S-CSCF
GGSN
Gateway GPRS Support Node
Session control services
Registration
AS interaction
Charging etc.
First Point of Contact
Privacy Control & QoS Authorisation
Local Services: Emergency & Local Numbering
Access Point to Network
Hides Topology & Configuration
Visited
Network
Home
Network
Source: ASTAP05-WP.IP&NGN-08_ETSI

27. IMS Architecture

28. Why IMS in NGN? - ETSI’s view
The IP Multimedia Subsystem generally fulfills the NGN requirements for conversational services
For managed, carrier operated telecom. networks
With Release 6, IMS becomes applicable to a range of access network types (3G RAN, WLAN)
For the benefit of the whole telecommunications industry
IMS is being proclaimed as the architecture of choice for converging networks (mobile – fixed), as well as voice and multimedia
It is predicted that IMS will enable IP to gradually replace circuit switched voice
Operators who own both fixed and mobile networks want to consolidate their networks
Growing IMS market, will encouraging greater usage and creation of new IP based services
Open interfaces allow for a wider choice of IMS suppliers
Market stimulation, decreasing costs (thanks to shared development/deployment costs)
Source: ASTAP05-WP.IP&NGN-08_ETSI

29. NGN Releases
Both ITU-T and ETSI are planning a series of phased “Releases” of NGN standards. For the ITU-T: -
A Release is a method of prioritizing by identifying a set of services to be addressed in a certain time frame. The ITU-T NGN-FG should progress the work to define the service requirements and capabilities needed to realize the services in addition to defining other associated capabilities as needed to facilitate a NGN in a first Release. The adoption of a release-based approach will not prevent other work, such as the development of more generic (release independent) capabilities, and the collation of services, requirements and issues for later releases.

30. ETSI - TISPAN
TISPAN in an ETSI technical committee, dealing with fixed networks and the migration from circuit switched networks to packet-based networks (Telecoms & Internet converged Services & Protocols for Advanced Networks (TISPAN)
TISPAN is responsible for all aspects of standardization for present and future converged networks including NGN
TISPAN also deals with service aspects, architectural aspects, protocol aspects, QoS studies, security related studies, mobility aspects within fixed networks, using existing and emerging technologies.

31. TISPAN NGN Architecture
PSTN/ISDN Emulation to support legacy terminals
IMS
TISPAN xDSL Connectivity Network
Access
Network Attachment
Subsystem
(SIP -
based)
IP Multimedia Subsystem (
Core IMS )
PSTN/ISDN emulation Subsystem P
Resource Control S
Subsystem T N
Access Transport
Network
Core Transport Network IP
Source: ASTAP05-WP.IP&NGN-08_ETSI

32. ETSI TISPAN NGN Roadmap
Towards a converged Wireline and Wireless NGN …
Release 1
Release 2
Release 3
xDSL,
WLAN
Fully
Nomadic
???
FTTx
2004
2005
2006
2007
2008
2009
2010
Release 1: bringing multimedia services
Limited mobility/user-controlled roaming
xDSL access focus; Access Network Attachment Subsystem
Release 2 optimizing access resource usage
According to user subscription profile and service use
Corporate users specific requirements …
Release 3 introducing full (inter-domain) nomadicity
Higher bandwidth access (VDSL, FTTH, Wi-MAX …)
Source: ASTAP05-WP.IP&NGN-08_ETSI

33. TISPAN NGN Rel-1 Scope Described in DTR/TISPAN-00001-NGN-R1
Release-1 completed Dec.2005
Major service capabilities
Real time conversational services (Voice & Videotelephony)
Messaging (Instant Messaging, MMS), Presence Management
Legacy services emulation enabling legacy PSTN/ISDN migration towards NGN
Content delivery such as VOD, Video Streaming, TV-Channel distribution (IPTV)
Network Architecture basis
xDSL access prime focus, also WLAN

34. ‘Home Networking’ standards development
due to the evolution of digital technology (e.g. media coding, Internet), home networks have evolved towards a complex set of devices supporting services and applications in the home-based business, information, entertainment and security/control areas
various standards bodies are developing standards for Home Networking applications in this converged environment
Home Networks have a role in Next Generation Networking
standards bodies have resolved to collaborate and promote the development of harmonized Home Networking standards and related networking standards.

35. NGN Consumer Access – Multiple Broadband Access Options
Games Console
Cable
Live Content
Ethernet
Video on Demand
802.11b/g
Router
Eth.
DTV Tuner
xDSL
Broadband Access
Ethernet
Set-top Box
Residential
Gateway
Fiber
Home
Security
Second Line
VoIP
Notebook
Home Shopping
PDA

36. Integrated networks, content, and entertainment systems
The Future Home…
DSL/Cable or MSO
Telephone
Wireless
camera
media
gateway
NAS for
MP3 & Video Content
Integrated networks, content,
and entertainment systems
Managed Security
Managed Voice
Managed Wireless
PTT
Cable Operator

37. In closing… NGN is a concept, not just a technology.
NGN is an attempt by operators to provide a single technology platform into the future to support converged services
NGN is a global initiative, coordinated by the ITU-T 
Robust and open standards are essential to the long term success of IMS and NGN
Not everyone likes or agrees with the NGN concept – especially large parts of the ‘internet community’
Regulators will have an interesting time trying to manage what is likely to become a standards/systems battle between various players

38. Links ITU-T NGN GSI http://www.itu.int/ITU-T/ngn/index.phtml
ETSI TISPAN
IETF
APT/ASTAP
GSC
DCITA -

39. Thank you for your attention
Questions ?...