Evolution to NGN - ITU · ITU-T Workshop on NGN (jointly organized with IETF) Geneva, 1-2 May2005...

International Telecommunication Union

ITU-T Workshop on NGN (jointly organized with IETF)Geneva, 1-2 May 2005

Evolution to NGNEvolution to NGN

Ghassem KoleyniNortel Networks

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Evolution & Revolution

Evolution (Migration)

A gradual process of change and development

Abrupt (Revolution)

A rapid process of change and development

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What is Expected of the Evolution to NGN -I

o Scalabilityo Higher reliability and trustworthiness o Higher resiliencyo Securityo Robustnesso Performanceo Ubiquity o Simplified authentication and billing

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What is Expected of the Evolution to NGN -II

o Richness in content and applicationo Common services infrastructure o Simplified service deploymento Higher capacityo Interoperable o Operable between Fixed, Mobile, Copper,

Fibre, Wireless…….o Multimedia

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What is Expected of the Evolution to NGN -IIIo Mix of traditional circuit switched

communication services and IP serviceso End-to-end interactivityo User control o Affordable

To achieve these expectations there is a need for:

Compliance of Networks to Sets of Globally Recognized Open Standards

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FGNGN Evolution Working Group (WG6)

Where, at present, sets of drafts on the evolution of PSTN/ISDN to NGN are being produced

To prepare a set of standards to drive the evolution of existing networks towards NGN, taking into consideration that there are potentially different approaches. This work is undertaken based on aspect of network evolution and interworking principles.

Our mandate:

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WG6 Activities

o Evolution of networks to NGN o PSTN/ISDN emulationo PSTN/ISDN simulationo Mixture of emulation and simulationo Interworking between PSTN/ISDN and

Simulated PSTN/ISDNo Emulation and Simulation when PBXs are

involved

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Evolution of Networks to NGN

Major investment has been made in existing networks. Today’s mix of technologies has produced different life span and thus amortization times for different parts of the networks. Thus, complete replacement of the legacy networks to NGN is neither advisable nor possible. So, a phased approach needs to be considered.

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Note on the following configurations

oThe following are a subset of scenarios presently under discussion in FGNGN. The relationship between the entities identified in the scenarios and those defined in the NGN framework architecture is work in progress

oThe intent is to use existing protocols to advantage. Protocol extensions or evolution would continue to be handled as they are today.

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A Step-by-Step Evolution Scenario -I

voicesignalingVoIP

BEARER AND SIGNALING TRAFFIC FROM OTHER OPERATOR’S PSTN/ISDN

Packet BasedNetworkUAM UAM

RUAM RUAM

PSTN network

RUAMTE TE TE

TE TE TE

PSTN network

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A Step-by-Step Evolution Scenario -II

TE TE TE

PSTN network

LE TE TE LE AN

PSTN network

Packet BasedNetwork

CSTGSG

VoIPsignaling

BEARER AND SIGNALING TRAFFIC FROM OTHER OPERATOR’S PSTN/ISDN

Packet BasedNetwork

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PSTN/ISDN Emulation & Simulation

EmulationoProvision of PSTN/ISDN service capabilities and interfaces using adaptation to an IP infrastructure.

SimulationoProvision of PSTN/ISDN-like service capabilities using session control over IP interfaces and infrastructure

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PSTN/ISDN Emulation

Originating legacy terminal

Terminating legacy terminal

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PSTN/ISDN Simulation

Originating network

Originating Subscriber’s

home network

End system

Terminating Subscriber’s

home network

Terminating network

End system

Core Transit network

NGN NGN NGN NGN NGN NGN NGN

IF3 IF4 IF4 IF3 IF2 IF1

Originating Transit network

Terminating Transit network

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Combination of PSTN/ISDN Emulation & Simulation

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Interworking Between PSTN/ISDN and Simulated PSTN/ISDN

Terminating Subscriber’s

home network

Terminating network

ISDN/PSTN

IFy IF4 IF1

NGN NGN NGN NGN

Terminating Transit network

Core Transit network

IF3 IF2 IFx

End System End System

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PSTN/ISDN Simulation Involving PBXs

Originating network

NGN NGN NGN

Originating subscriber’ s

home network

Terminating subscriber’s

home network

Terminating network

IF2 IF3 IF2 IF1

NGN PBX

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So, NGN Would Be!

EvolvedNetwork

UbiquitousAnywhere,

Anytime

MultimediaIntegrated voice, video and data

SecureTrustworthy

Network

Interactiveend-to-end

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And Finally….

The future is an access- and location-independent, secure, packet-based telecommunications infrastructure that synergistically delivers on maximizing the strengths of both the Internet and the Legacy Infrastructures

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List of Acronyms

AG Access GatewayAN Access NetworkCS Call ServerISDN Integrated Services Digital NetworkLE Local ExchangePBX Private Branch ExchangePSTN Public Switched Telephone NetworkQoS Quality of ServiceRUAM Remote User Access ModuleSG Signalling GatewayTE Transit ExchangeTG Transit GatewayUAM User Access Module

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Thank you for your attention

Evolution to NGN - ITU · ITU-T Workshop on NGN (jointly organized with IETF) Geneva, 1-2 May2005...

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Transcript of Evolution to NGN - ITU · ITU-T Workshop on NGN (jointly organized with IETF) Geneva, 1-2 May2005...

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