NGN and IP Multimedia

Next Generation Networks (NGN)&

the IP Multimedia Subsystem (IMS)

Kevin SutherlandManagerCommunications Engineering Section

International Training Program07 September 2006

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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

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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.

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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 emails on a refrigerator, TV on your PC or internet on your TV…

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Convergence… new multimedia devices

Source:http://www.telstra.com.au/abouttelstra/investor/docs/tls366_stratrevjustinmilne.pdf

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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.

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Existing Telecommunications

• 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

Services

Transport & Access

Source: ASTAP05/WS-IP&NGN/13

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Emerging Telecommunications

Services and access technologies only need to interface to the common transport layer (IP)

Access

Transport

ServicesInternet 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


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Access and Service Independence

• Each service must be integrated to a specific access technology.

• With many services converging it becomes complex to integrate single access.

• IP provides a common interface for access and services

• One point of interface simplifies the introduction of new devices and services.

video data voice

dsl wi-fi cable

Internet Protocol

video data voice

dsl wi-fi cable


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Networks in TransitionLower cost and

innovative services drives network convergence

Corporate

Video

PSTN

Services

Wireless

Voice

WWW

IP Core Broadcast

PSTN

Toll Bypass

IP

PSTN

Academic

Corporate

WWW

IP

Broadband

1G-2G

GSM

CDMA

IP

CATV

MPEG

IP


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Core IP/MPLS Networks

User

One schematic view of NGN…

DSL

ASPNetwork

WEB

ASPNetwork

VoD

DOCSIS

IMS

MMS

GSMWi-Fi

Access

Transport

ServicesSIP

PSTN

PSAPNetwork

E911


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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

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Short term issues

NumberingNumbering

Regulation of “Standard Telephone

Service”

Regulation of “Standard Telephone

Service”

Quality of ServiceQuality of

Service

“Next Generation”Longer term issues

EmergencyEmergency

PrivacyPrivacy

SecuritySecurity

CompetitionCompetition

Consumer awarenessConsumer awareness

JurisdictionJurisdiction

Core policy areas:• Consumer issues• Competition• SecurityScope for self-regulation

Policy implications….Source: ASTAP05_WS.IP&NGN-09

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INTEROPERABILITY?

INTEROPERABILITY?

SECURITY? INNOVATION

ACCESS?

Source: ASTAP05_WS.IP&NGN-09

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Access, security & interoperability

E-mail

SME E-commerce

PSTN, NGN, 3GE-bankingE-tax

Office systems

Intranets

E-business, Managed networks, Corporate networks

SMS

National security

SECURITYWiFiWiMAX

IP TV, PVR

INTEROPERABILITY

ACCESSPay TV

spam

Free-to-air &Satellite b/c


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ACCESS INTEROPERABILITY

ConsumerConsumer CompetitionCompetition SecuritySecurity

EmergencyQuality of ServiceRights of redressDirectoriesPrivacyInformationChoiceSpecial needsUniversal service

ConvergenceBundlingBottlenecksInterconnection & accessCarrier selectionNumber portabilityMigrationInvestment

STANDARDS

Critical InfrastructureViruses & firewallsNetwork attackDisaster recoveryLawful InterceptionCybercrimeMisuse

IDENTITY, NUMBERING, ADDRESSING


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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

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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…

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ITU-T Structural model of Functional components

Transport stratum

Service stratum

MediaHandlingFunctions

AccessFunctions

Othernetworks

Othernetworks

CustomerFunctions

TransportUser

Profile Functions

Application Functions

GatewayFunctions

Transport Control Functions

Control

Media

NNIUNI

EdgeFunctions

Network Attachment

Control Functions

Core Transportfunctions

Core TransportFunctions

AccessTransportfunctions

AccessTransportFunctions

Service and ControlFunctions

ServiceUser

Profile Functions

Man

agem

ent F

unct

ions

Ref: http://ties.itu.int/u/fgngn/fgngn/readonly/200504_Geneva/focus_group_reports/FGNGN-MR-0040r1.doc

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Current coverage of FGNGN Release 1

Resource and Admission Control Functions

RACF

Network AccessAttachment Functions

NAAF

Other Multimedia Components …

Streaming Services

Application Functions

Core transport Functions

Access Transport Functions

NGN Terminals

CustomerNetworks

UserProfile

Functions

Oth

er N

etw

ork

s

LegacyTerminals

GW

PSTN / ISDN Emulation

IP Multimedia Component

NNITransport Stratum

Service Stratum

UNI

Edge Functions

Access Functions

Service and

Control Functions

Customer and Terminal Functions

QoSAspects and one part of Control aspect(IP QoSsignaling Requirement) A part of

Release 1 coverage

Ref: http://ties.itu.int/u/fgngn/fgngn/readonly/200504_Geneva/focus_group_reports/FGNGN-MR-0040r1.doc

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ITU-T releases

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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”

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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 NetworkSource: ASTAP05-WP.IP&NGN-08_ETSI

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• 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

What is IMS?

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• Services and Control– 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

What does IMS provide?

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VisitedNetwork

UE

HomeNetwork

ASSLFHSS

GGSN

S-CSCFP-CSCF I-CSCF

Session control services

Registration

AS interaction

Charging etc.

Access Point to Network

Hides Topology & Configuration

First Point of Contact

Privacy Control & QoS

Authorisation

Local Services: Emergency &

Local Numbering

Diameter ProtocolSIP Protocol

IMS basic componentsCSCF – Call State Control FunctionsP – ProxyI – InterrogatingS – ServingUE – User EquipmentSLF- Subscriber Location FunctionHSS- Home Subscriber ServerAS – Application Server

Gateway GPRS Support Node

Source: ASTAP05-WP.IP&NGN-08_ETSI

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IMS Architecture

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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

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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.

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ETSI - TISPAN• TISPAN in an ETSI technical committee,

dealing with fixed networksand the migration from circuit switched networksto 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.

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TISPAN NGN Architecture

AccessNetwork AttachmentSubsystem

PSTN

Access TransportNetwork Core Transport Network

IMS

IP

(SIP -based)IP Multimedia Subsystem

(Core IMS )

Resource ControlSubsystem

TISPAN xDSL Connectivity Network

PSTN/ISDN emulationSubsystem

PSTN/ISDN Emulation to support legacy terminals


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ETSI TISPAN NGN Roadmap

2006

Towards a converged Wireline and Wireless NGN …

Release 3

2007 2008

Release 1 Release 2

200920052004

xDSL,WLAN FTTx Fully

Nomadic

• 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 …)

???

2010


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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

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‘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.

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NGN Consumer Access – Multiple Broadband Access

Options

xDSLEthernet

Home Shopping

Eth.DTV Tuner

Second Line VoIP

Residential Gateway

Live Content

Video on Demand

Games Console

NotebookNotebook

PDAPDAB

road

ban

d A

cces

s

Cable

HomeSecurity

Fiber

802.11b/gRouter

Set-top BoxE

ther

ne

t

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The Future Home…

DSL/Cable or MSOTelephone

Wireless camera

Wireless media

gateway

NAS for MP3 & Video

Content

Integrated networks, content,and entertainment systems

Managed Security

Managed Voice

Managed Wireless

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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

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Links

• ITU-T NGN GSI http://www.itu.int/ITU-T/ngn/index.phtml• ETSI TISPAN

http://portal.etsi.org/portal_common/home.asp?tbkey1=TISPAN

• IETF http://www.ietf.org/• APT/ASTAP

http://www.aptsec.org/Program/ASTAP/EG/NGN/index.htm• GSC http://www.gsc.etsi.org/• DCITA - http://www.dcita.gov.au

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Thank you for your attention

• Questions ?...

Documents

NGN and IP Multimedia