- D1 -FT/Networks and Carriers Division ITU-T WORKSHOP on NGN (Geneva 9-10 July 2003)

NGN an architecture for 21st century networks?ITU-T NGN Workshop (Geneva, 9-10 July 2003)Keynote session

Patrice Collet (France Telecom, Director, Network Strategy and

Architecture)

- D2 -FT/Networks and Carriers Division ITU-T WORKSHOP on NGN (Geneva 9-10 July 2003)

FT global network evolution context

A very competitive environmentKeeping network costs as low as possibleFaster return on investment is neededA strong pressure to tariff decrease

PSTN traffic slowly growingShared now between several competitors

A steady data traffic demand growth resulting from Internet traffic demand

Started with dial up accessIncreased with broadband access offers

- D3 -FT/Networks and Carriers Division ITU-T WORKSHOP on NGN (Geneva 9-10 July 2003)

Major network evolution trends (1)A large ADSL deployment :

End 2002 : 2000 mdf (out of 12 000) equipped with DSL serving 21 millions lines 1.4 million users connected

A rapid growth: more than 2 millions users end June 2003Packet backbones deployment

Expansion of ATM network to collect traffic from DSLAMsMore than 400 ATM cross connects (starting from 80 in 1998)

An IP backbone deployed serving around 60 PoP in 30 towns With ADSL a new type of mass market access network is being built

To meet an actual and ready to pay demand: the second time in telecom history after telephone service

- D4 -FT/Networks and Carriers Division ITU-T WORKSHOP on NGN (Geneva 9-10 July 2003)

Major network evolution trends (2)Stable telephone network

Reduced number of core switches from ≈ 900 to less than 600 end 2002Decrease of the number of transit exchanges

To face evolution of interconnection traffic schemeAnd reduce network costs (energy, m², taxes…)

A limited number of new facilities to be implemented (in general IN based)Reduction of software releases to be deployed

A good quality of serviceNo short term obsolescence of switching equipments

But a part of local exchanges are now roughly 20 years old

–Renewal imagined starting in the second part of the decade

Which technology for the future telephone service?TDM network renewal strategy

- D5 -FT/Networks and Carriers Division ITU-T WORKSHOP on NGN (Geneva 9-10 July 2003)

Access network perspectiveThrough its increasing bandwidth, xDSL gives the potential of new services

New multimedia services integrating voice, data & video could be provided,These services are now appearing on the Internet (videophony & videoconference,

streaming of video clips, Web TV, …), but with uncontrolled QoS

xDSL opens the door to residential and SME voice services migration to packet networks

xDSL deployment shapes the future access network architectureADSL, ADSL2+, SDSL, VDSL interfaces provided by the same DSLAMEnd user fiber connection to DSLAM with ATM traffic concentrationIntegration of video functions

Digital TV program broadcasting and channel zapping

In some DSLAM implementations POTS connection are or will be providedDSLAMs as the future “universal” customer connecting unit?

- D6 -FT/Networks and Carriers Division ITU-T WORKSHOP on NGN (Geneva 9-10 July 2003)

NGN as the 21st century network architecture?

What provides NGN concept ?A unified packet transport layer for all types of servicesA session based control architecture

For person to person voice or video services over a packet infrastructure

FT expectations from NGNBe the support of new multimedia services combining voice data and video

To generate new revenue streamsIn addition be the future infrastructure of telephony services

Shared with multimedia servicesTo face the need for renewing PSTN infrastructure (when obsolete)While securing voice revenue stream

Be able to combine Internet services and more traditional communication servicesInterest for NGN focussed on access systems

- D7 -FT/Networks and Carriers Division ITU-T WORKSHOP on NGN (Geneva 9-10 July 2003)

Some requirements for NGN implementation

Need for interoperability between equipment providersCommonly agreed functional and organic architectures neededA set of standardized interfaces and protocols to be agreed upon

Ability to serve several kinds of access networkFixed copper, fiber, wireless..Mobile

An open services architectureStandard interfaces open to third party service providersAllowing for Interaction between Internet access services and other multimedia

servicesProbably more a question of role of actors than a technical issue

An architecture based on UMTS (Release 5/6) architecture principlesIncluding some mobility features at the fixed access: user nomadismProviding minimum service continuity between fixed and mobile access through VHE

- D8 -FT/Networks and Carriers Division ITU-T WORKSHOP on NGN (Geneva 9-10 July 2003)

Some requirements for NGN implementation (2)Need for QoS differentiation

Services like voice, video, need QoS control mechanismsEspecially at the access level

Limited bitrate access shared between several services–upstream ADSL channel for example

Need for bandwidth allocation mechanisms

A set of management functions shared between different servicesSelf-provisioning, usage metering for billing, QoS monitoring, statistics..

A common technology for transport layerIP and MPLS seem the good candidate for such a layer

Large world industrial support and good evolution speedATM for bandwidth sharing on copper to provide QoS to voice and video services

Significant efforts of standardisation/ selection of relevant standards work still to be done

- D9 -FT/Networks and Carriers Division ITU-T WORKSHOP on NGN (Geneva 9-10 July 2003)

Architecture : standardization needs

NB Wireless

BB Wireless

BB Wireline

Service X Service Y

Unified transport :

Open interfaces

Separated control

Management

OSA/WebServices ?

IP/ATM/MPLS ?Bandwidth sharing ?

QoS mechanism ?

H323/SIP ?

FMC ?MGCP/H248 ? Usage

measurement ?

ENUM ?

- D10 -FT/Networks and Carriers Division ITU-T WORKSHOP on NGN (Geneva 9-10 July 2003)

Conclusion

There is an opportunity window for NGN architecture implementationObsolescence of TDM systems started to be deployed in the early 80s

Two key questions:True multimedia capability of this architectureQoS benefits provided by NGN compared with ISP-like architecture

Some challenges:Keep an integrated architecture open enough

To make it capable to quickly and easily evolve

Achieve the necessary industry consensusTo meet the interoperability requirements