NGN MIGRATION Prof. dr Nataša Gospić, Transport and Traffic Engineering Faculty University...

NGN MIGRATION

Prof. dr Nataša Gospić,Transport and Traffic Engineering Faculty University Belgrade

Regional Workshop on Assistance to the Arab Region for the implementation of Next Generation Networks (NGN)

Cairo (Egypt), 15-16 December 2009

CONTENTS

ITU-D Activities in Migration towards NGN

ITU-T Recommendations Building elements for NGN

development Example scenarios from Rec. Y.2261 Migration Scenarios from ITU-D SG 2

Guidelines

ITU-D ACTIVITIES

SG 1: Telecommunication development strategies and policiesNational telecommunication policies and regulatory strategies which

best enable countries to benefit from the impetus of telecommunications as an engine of economic, social and cultural development.

Finance and economics, including World Trade Organization (WTO) issues, tariff policies, case studies, application of accounting principles as developed by ITU-T Study Group 3, private-sector development and partnership.

SG 2: Development and management of telecommunication services and networks and ICT applications

Methods, techniques and approaches that are the most suitable and successful for service provision in planning, developing, implementing, operating, maintaining and sustaining telecommunication services which optimize their value to users. This work will include specific emphasis on telecommunication network security, mobile communication and communications for rural and remote areas, with particular focus and emphasis on applications supported by telecommunications

The implementation and technical application of information and communication technology, using studies by the others Sectors, taking into account the special requirements of the developing countries

http://www.itu.int/ITU-D/study_groups/index.html

3

ITU-D SG 1 and NGN

Q 6-2/1: Regulatory impact of next-generation next-generation networksnetworks on interconnection

Q 7-2/1: Regulatory policies on universal accessuniversal access to broadband services

Q 10-2/1: Regulation for licensinglicensing and authorization of converging services

Q 12-2/1: Tariff policies, tariff modelsTariff policies, tariff models and methods of determining the costs of services on national telecommunication networks, including next-generation networks

4

ITU-D STUDY GROUP 2 NGN ISSUES Q 18-1/2: Implementation aspects of IMT-2000 and

information-sharing on systems beyond IMT-2000 for IMT-2000 for developing countriesdeveloping countries

Q 19-1/2: Strategy for migration from existing networks to next-generation networks next-generation networks for developing countries

Q 20-1/2: Examination of access technologies for broadband telecommunicationsbroadband telecommunications

5

Guidelines on migration of existing networks to Next-Generation Networking (NGN) for developing countries

Question 19-1/2 of ITU-D Study Group 2 (Study Period 2006-2010)

Migration to NGN is a complex issue and it is not expected that these guidelines provide any comprehensive technical tutorial on this subject.

It will offer basic principles to support the path to full NGN

6

Trends in Telecom Reform

2007: “The Road to Next-Generation Networks (NGN)” includes:

Ch 1: Market trends Ch 2: NGN-A regulation overview Ch 3: NGN Technology Ch 4: FMC Ch 5: Interconnection in an IP-based environment Ch 6: International interconnection, NGN and ICT

development Ch 7: NGN and US Ch 8: Consumer Protection and QoS Ch 9: Enabling environment for NGN Ch 10: Why NGN, Why Now

7

Best Practice Guidelines for Next-Generation Networks (NGNs) Migration

Global Symposium for Regulators (GSR), Dubai, February 2007 refers to: An enabling regulatory regime that fosters

innovation, investment and affordable access to NGNs and facilitates migration to NGNs

Innovative Regulatory Policies Must Be Developed To Facilitate NGNs

http://www.itu.int/ITU-D/treg/bestpractices.html

8

Best Practice Guidelines on Innovative infrastructure sharing strategies to promote affordable access for all

Global Symposium for Regulators (GSR) , Pattaya, Thailand, March 2008

A. Promoting an enabling environment 1. Appropriate Regulatory framework 2. Competition and investment incentives

B. Innovative regulatory strategies and policies to promote infrastructure sharing 1. Reasonable terms and conditions 2. Pricing 3. Efficient use of resources 4. Scarce resources 5. Licensing 6. Conditions for sharing and interconnection 7. Establishing an infrastructure sharing one-stop-shop 8. Improving transparency and information sharing 9. Dispute resolution mechanism 10. Universal access 11. Sharing with other market players and industries

http://www.itu.int/ITU-D/treg/bestpractices.html

9

Other useful information

The 2007 Global Symposium for Regulators Best Practice Guidelines on Next Generation Networks migration, available at http://www.itu.int/ITU-D/treg/bestpractices.html and also a contribution to ITU-D Question 19-1/2 in Document 1/090.

GSR Discussion Paper on NGN Interconnection and Access, prepared by Scott Marcus, available online at http://www.itu.int/ITU-D/treg/Events/Seminars/GSR/GSR07/discussion_papers/JScott_Marcus_Interconnection_IP-based.pdf

Scott Marcus presentation to GSR 2007 http://www.itu.int/ITU-D/treg/Events/Seminars/GSR/GSR07/Documents_presentations/Session_III%20Scott%20Marcus_interconnect.pdf

Workshop on NGN Interconnection in the Arab Region, Manama, Bahrain, May 2007, all presentations available at http://www.itu.int/ITU-D/treg/Events/Seminars/2007/Bahrain/agenda.html

TREG link to NGN resources at http://www.itu.int/ITU-D/treg/related-links/links-docs/NGN.html Other Resources on NGN Interconnection The European Regulators’ Group Opinion on Regulatory Principles of Next Generation Access

http://erg.ec.europa.eu/doc/publications/erg07_16rev2_opinion_on_nga.pdf The Future of IP Interconnection, 29 January 2008, WIK Consulting,

http://ec.europa.eu/information_society/policy/ecomm/doc/library/ext_studies/future_ip_intercon/ip_intercon_study_final.pdf

NGN UK website http://www.ngnuk.org.uk/

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15-16 December 2009 Regional Workshop on NGN,Cairo, Egypt

Series Y.2… related NGN RecommendationsY.2000–Y.2099 Frameworks and functional architecture models

Y.2100–Y.2199 Quality of Service and performance

Y.2200–Y.2249 Service aspects: Service capabilities and service architecture

Y.2250–Y.2299 Service aspects: Interoperability of services and networks in NGN

Y.2300–Y.2399 Numbering, naming and addressing

Y.2400–Y.2499 Network management

Y.2500–Y.2599 Network control architectures and protocols

Y.2600–Y.2699 dealing with future packet based networks

Y.2700–Y.2799 Security

Y.2800–Y.2899 Generalized mobility

Y.2900–Y.2999 dealing with the carrier grade open environment

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NGN

ITU-T Recommendation Y.2001 defined NGN as “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.”

From a technology perspective, NGN is based on: a new architecture that modifies both the core and access

parts of a telecommunication network and changes the way it delivers services to end-users.

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Separation of services from transport in NGN

N G N tr a n sp o rt

N G N se r v ice s

e .g ., v o ic e te le ph o n y se rv ice s ( au d io , fa x , e tc .)

e .g ., D a ta s erv ic es (W W W , e -m ai l, e tc .)

e .g ., V ide o s erv ic es (T V, m o v ie , e tc .)

C O -C S , C O -P S a nd C L P S la ye r te c hn o lo g ie s

NGN STRATUMS

U ser p lan e

C o n tro l p la ne

M a n a gem ent p la n e

N G N service stra tum

U ser p lan e

C o n tro l p la ne

M a n a gem ent p la n e

N G N tra n sp o rt s tra tu m

NGN service stratum: That part of the NGN which provides the user functions that transfer service-related data and the functions that control and manage service resources and network services to enable user services and applications. User services may be implemented by a recursion of multiple service layers within the service stratum.

NGN transport stratum: That part of the NGN which provides the user functions that transfer data and the functions that control and manage transport resources to carry such data between terminating entities. The data so carried may itself be user, control and/or management information. Dynamic or static associations may be established to control and/or manage the information transfer between such entities. An NGN transport stratum is implemented by a recursion of multiple layer networks as described in ITU-T Recommendations G.805 and G.809. From an architectural perspective, each layer in the transport stratum is considered to have its own user, control and management planes.

Coverage of ITU-T NGN Release 1

Resource and Admission Control Functions

RACF

Network AccessAttachment Functions

NAAF

Other M ultimedia Components …

Streaming Services

Application Functions

Core transport Functions

Access Transport Functions

NGN Terminals

CustomerNetworks

UserProfile

Functions

Oth

er Netw

ork

s

LegacyTerminals

GW

PSTN / ISDN Emulation

IP M ultimedia 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

NGN architecture described in ITU-T Y.2012

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MIGRATION-EVOLUTION TO NGN

From ITU-T specification Y.2261: PSTN/ISDN Evolution to NGN

“Evolution to NGN: A process in which whole or parts of the existing networks are replaced or upgraded to the corresponding NGN components providing similar or better functionality, while attempting to maintain the services provided by the original network and the possibility of additional capabilities”

Migration to NGN synonymous to evolution to NGNTo help migration of legacy networks to NGN at least voice based services, NGN provides two capabilities.

One of this is “Emulation” which supports provision of PSTN/ISDN service capabilities and interfaces using adaptation to an NGN infrastructure using IP.

The other is “Simulation” which supports provision of PSTN/ISDN-like service capabilities using session control over IP interfaces and infrastructure.

EMULATION/SIMULATION

To help migration of legacy networks to NGN at least voice based services, NGN provides two capabilities:

“Emulation” which supports provision of PSTN/ISDN service capabilities and interfaces using adaptation to an NGN infrastructure using IP.

“Simulation” which supports provision of PSTN/ISDN-like service capabilities using session control over IP interfaces and infrastructure.

BUILDING ELEMENTS FOR NGN DEVELOPMENT

COUNTRY’S POLICY AND STRATEGY FOR BROADBAND REGULATORY POLICY

MACRO AND MICRO LEGACY REGULATION?

OPERATORS BUSINESS MODELES MIGRATION OF FIXED/MOBILE NETWORKS OR BOTH TOWARDS NGN USER DATA BASE AND USER’S DEMANDS BUSINESS CUSTOMERS INTERNATIONAL TRAFFIC AND VoIP

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STAKEHOLDERS’ EXPECTATIONS

OPERATOR AND SERVICE PROVIDERS Want that:

Investment is optimized, OPEX is cut NGN architecture leads to satisfactory QoS across multiple interconnected NGN Continuity of services offered to end-users Improvements in network architectures , easy maintenance. Simplification and harmonization of services through single interface/multiple devices Quick time to market for new service

USERS Will benefit from the ability of network operators and service providers to provide guaranteed QoS of voice services

on NGN New services Cost reduction by sourcing voice and data Want to switch between different communication devices

MANUFACTURERS Want to know that currently available terminals are suitable for use with NGN services Confirmation of network architecture suitability will give guidance of the required performance of routers and media

gateways.

REGULATOR Want to have a better assurance that users are not adversely affected as PSTN services migrate to NGN Preserve competition

NETWORK OPERATORS/ SERVICE PROVIDERS,

- Where and how to start?-

PSTN optimization and consolidation? From NGNs drivers?

CAPEX and OPEX reduction Revenue generation and protection FMC IMS NG Access.

Following examples from developed countries? Have EVOLUTIONARY OR REVOLUTIONARY APROACH? Have TOP-DOWN or BOTTOM-UP APPROACH

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NETWORK OPERATORS, SERVICE PROVIDERS, CONTENT DEVELOPERS

BUSINESS OPPORTUNITIES

NGN remains the only way to preserve gradually declining revenues

Foster innovation dynamic New services/substitution and service differentiation Market share protection and possible growth Saving on network maintenance, personnel, IT and power

consumption (ITU figures: Network maintenance ~30%, Personnel ~30-40%, IT cost ~40%, Power consumption ~40%)

Network consolidation requires less physical assets (e.g. real estate ~40% saving)

Economies coming from IP

NETWORK OPERATORS, SERVICE PROVIDERS, CONTENT DEVELOPERS,

-Business risk-

High investment required: core – justified by cost savings and relatively low risk access –big demand uncertainties, major investment

before demand are clear, type of regulation Simultaneous investment in NGN in fixed and mobile Uncertainty about business model Entrance of third party may diminish incumbent

revenues Technical challenges New legal environment and return of investment

MIGRATION

CORE NETWORK DOMAIN rather easy to set up the migration plan

ACCESS NETWORK DOMAIN complex impact of the service provision not recommended to choose one specific

technology to replace any legacy access network systems

Generic view of Core Network migration to NGN

TDM

Packet core

NGN (ALL IP based)

ITU-T RECOMMENDATIONS

Recs Y.2261, Y.2262 and Y.2271 provides some functional guidelines for NGN migration with a focus on emulating existing PSTN/ISDN network

Example scenarios from Rec. Y.2261 Call Server (SoftSwitch) based approach of

the Core network with three variants (scenarios): Scenario 1: Migration starts from Local

Exchanges (LE) Scenario 2: Migration starts from Transit

Exchanges (TE) Scenario 3: One-step approach

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Scenario 1: Migration from LE

Step 1 Some of the LEs are replaced by Access Gateways (AG) controlled by a Call

Server (CS). Access elements originally connected to the removed LEs, are now directly

connected to AGs : PABXs and Access Nodes (AN). User Access Modules Functionality (UAM) assumed by AG and CS. Trunking Media Gateways (TMG) and Signaling Gateways (SG) are deployed

for interconnection between the PSN and the TEs of the legacy network as well as other operators' PSTNs/ISDNs.

AGs and TMGs are all controlled by the CS.

Step 2 Remaining LEs are replaced by the AGs, Transit Exchanges (TE)s are removed and their control functions are

performed by CS. TMGs and SGs are deployed for interconnection between PSTN and other

operators' PSTNs/ISDNs. AGs and TMGs are all controlled by the CS.

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LE

LE

TE TE TE

PABX PABX

PABX PABX

UAM

UAM

UAM

UAM

AN AN

AN

PSTN/ISDN

AN LE

LE

PABX

AN AN

Packet Switched Network

AG PABX

AG

AG

LE TE

PABX PABX

UAM UAM

AN AN

PSTN/ISDN

LE TE TE

TMG

SG CS

PABX PABX

PABX

AN

AN

AN

AN


AG

CS

AG

PABX

AG

AG

Voice Signalling Data

Bearer and Signalling traffic from other operator’s PSTN

SG TMG

TMG

Scenario 1

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Scenario 2: Migration from TE

Step 1 All TE functions are performed by the TMGs and the SGs under the control of

the CS. LEs are connected to the Packet Switched Network (PSN) via TMGs and SGs. TMGs & SGs are deployed for interconnection between PSN and other

operators’ PSTNs/ISDNs. AGs & TMGs are all controlled by CS.

Step 2 All LEs are replaced by AG controlled by CS Access elements originally connected to the removed LEs, are now directly

connected to AGs : PABXs and Access Nodes (AN). User Access Modules Functionality (UAM) assumed by AG and CS. TMGs & SGs are deployed for interconnection between PSN and other

operators’ PSTNs/ISDNs. AGs & TMGs are all controlled by CS.

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LE

LE

TE TE TE

PABX PABX

PABX PABX

UAM

UAM

UAM

UAM

AN AN

AN

PABX PABX

PABX

UAM

UAM UAM

AN

AN

AN

AN

PSTN/ISDN


PABX

AN LE

LE

SG


SG

LE

LE LE

LE SG

UAM

PABX PABX

PABX

AN AN


AG

PABX

AG



SG

AG AG

AG

AG

TMG

CS

CS

TMG

TMG TMG

Scenario 2

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Scenario 3: One-Step Approach

LEs are replaced by the AGs and their functions are transferred to the AGs and the CS.

All access elements such as user access modules (UAMs), remote user access modules (RUAMs), and private automatic branch exchanges (PABXs) are connected to access gateways (AGs).

The access networks (ANs) are either replaced by the access gateways (AGs) or are connected to packet based network (PBN) through the AGs.

Transit gateways (TMGs) under the control of the call server (CS), and the signalling gateways (SGs), are deployed to replace the TE functions and provide interconnection between PSN and other operators’ PSTNs/ISDNs.

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LE

LE

TE TE TE

PABX PABX

PABX PABX

UAM

UAM

UAM

UAM

AN AN

AN

PSTN/ISDN

AN LE

LE

PABX PABX

PABX

AN AN


AG

PABX

AG



SG

AG AG

AG

AG

TMG

CS Scenario 3

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IMS-based evolution to NGN

LE

LE

LE

LE

TE TE TE

PABX PABX

PABX PABX

UAM

UAM

UAM

UAM

AN

AN

AN

AN

AG

PABX

PABX

AN

AN

PSTN/ISDN


TMG SG

Voice VoIP Signalling

IMS

AG

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NGN DEVELOPMENT IN DEVELOPING COUNTRIES NGN development is linked to national broadband policy

More broadband, better NGN Denmark, N. Korea, Iceland

Lacking in many developing countries Low penetration rates Incumbent dominance Economy is not ICT based

Evolutionary paths different in developing and developed countries: Affordability and access Degree of competition Pace and manner of reform

Leverage opportunities? Who will be driver: Policy makers, Regulator, Operators, Customers

ITU-D SG 2 Q.19-1/2: Guidelines for Migration of Existing Networks to Next-Generation Networks (NGN) for Developing Countries

1. Technological development

2. NGN as a today’s solution

3. NGN Technologies

4.Migration to NGN

5. Review from NGN Deployment

6.Regulatory challenges raised by NGN migration

7. Status of NGN Migration and further work

Doc: ITU-D/2/190Rev.2-E

CONTENTS

MIGRATION SCENARIOS

Using emulation and/or simulation of NGN, there are various ways of migration from legacy network to NGN. This should be decided according to the each country or provider situation.

Three different types of migration scenarios are introduced as a framework consideration but other possibility should not be limited: Overlay Scenario Replace Scenario Mixed Scenario

PSTN

NGN

EmulationPSTN

NGN NGN

Emulation

PSTN

NGN

OVERLAY SCENARIOO

OverlayNGN structure

Expansion of NGN usage

Replacement of remaining infrastructure

Starting point

PSTN

Infrastructure Users

legacy

legacy

NGN legacy

legacy

PSTN

PSTN

Integration oflegacy users

NGN

NGN

NGN

PSTN

NGN NGNFinal stage⑥

NGN

NGN

•NGN will be deployed and operate jointly with PSTN/ISDN. NGN will occupy more portions while PSTN/ISDN will continuously decrease and finally migration to NGN.•Useful in the case of country or operator who have well stable or new PSTN/ISDN infrastructure

Infrastructure Replacement Scenario

Infrastructurereplacement

New serviceintroduction


Expansionphase

Starting point

PSTN


legacy

NGN

NGN

NGN legacy

EmulationNGN (IMS)

Emulation

NGN

Emulation

NGN (IMS)


legacy

legacy

•NGN emulation will widely use to support voice oriented services but keeping the legacy terminal such as black phone. So end user could not recognize the change of technology behind their terminal.•Useful in the case of country or operator who does not have enough PSTN/ISDN infrastructures, so it is already lack of connectivity to support voice services

Mixed Scenario

•Uses both overlay and emulation, so at the beginning some of PSTN user connection will replace by NGN emulation while other PSTB users will keep their PSTN connections•Useful in the case of country or operator who place in the middle stage which means some parts of PSTN/ISDN need to replacement but other parts of PSTN/ISDN still good status such as well stable or with new PSTN/ISDN infrastructure

Partial Infrastructurereplacement

New serviceintroduction


Expansionphase

Starting point

PSTN


legacy

NGN

legacy

IMS

PSTN

NGN (IMS)

NGN (IMS)

Emulation

NGN

NGN


legacy

legacy

ITU-D Guidelines for Migration of Existing Networks to NGN for Developing Countries-

A vast majority of developing countries are aware of NGN migration and the challenge it raises;

Many countries already introduced some components of NGN architecture within their networks like VoIP with softswitches or the introductrion of national IP backbones; some have even migrated a significant part of their legacy voice architecture to NGN;

Still, what characterizes many developing countries is the lack of Broadband access – especially in its wireline form (DSL, Fiber,…) – with respect to developed countries;

Lack of Broadband access results in marginal if inexistent use of new NGN services – like IPTV and multimedia communication – in many developing countries;

Many developing countries also view the new NGN architecture as being complex with competing standard bodies (3GPP, TISPAN, ITU,…) and fear that this

15-16 December 2009 Regional Workshop on NGN, Cairo, Egypt

Developing countries

Developing countries should be encourage to take a part in international effort to develop best migration path to NGN.

Mr. Roberto Viola, General Director of the Italian Regulator (AGCOM)

“If we wait for private capital to flow in the direction of NGN we might wait in certain parts of Europe for decades. The question that rises is whether you should wait for the car makers to build the highways. Telecom operators might for example leverage from regional governments and municipalities investing in optical fibers and other basic infrastructures”. (EETT NEWSLETTER, ISSUE Ν° 17 \ JULY 2008)

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15-16 December 2009 Regional Workshop on NGNCairo, Egypt

THANK YOU FOR YOUR ATTENTION!

Prof. dr Natasa GospicProf. dr Natasa GospicUniversity BelgradeUniversity Belgrade

Tel: +381 11 3091310Email [email protected]

NGN MIGRATION Prof. dr Nataša Gospić, Transport and Traffic Engineering Faculty University...

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