Presentation on theme: "Cairo (Egypt), December 2009"— Presentation transcript:
1 Cairo (Egypt), 15-16 December 2009 NGN MIGRATIONProf. dr Nataša Gospić,Transport and Traffic Engineering FacultyUniversity BelgradeRegional Workshop on Assistance to the Arab Region for the implementation of Next Generation Networks (NGN)Cairo (Egypt), December 2009
2 CONTENTS ITU-D Activities in Migration towards NGN ITU-T RecommendationsBuilding elements for NGN developmentExample scenarios from Rec. Y.2261Migration Scenarios from ITU-D SG 2 Guidelines
3 ITU-D ACTIVITIES http://www.itu.int/ITU-D/study_groups/index.html 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 applicationsMethods, 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 telecommunicationsThe 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
4 ITU-D SG 1 and NGNQ 6-2/1: Regulatory impact of next-generation networks on interconnectionQ 7-2/1: Regulatory policies on universal access to broadband servicesQ 10-2/1: Regulation for licensing and authorization of converging servicesQ 12-2/1: Tariff policies, tariff models and methods of determining the costs of services on national telecommunication networks, including next-generation networks
5 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 developing countriesQ 19-1/2: Strategy for migration from existing networks to next-generation networks for developing countriesQ 20-1/2: Examination of access technologies for broadband telecommunications
6 Question 19-1/2 of ITU-D Study Group 2 (Study Period 2006-2010) Guidelines on migration of existing networks to Next-Generation Networking (NGN) for developing countriesQuestion 19-1/2 of ITU-D Study Group 2 (Study Period )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
7 Trends in Telecom Reform 2007: “The Road to Next-Generation Networks (NGN)” includes:Ch 1: Market trendsCh 2: NGN-A regulation overviewCh 3: NGN TechnologyCh 4: FMCCh 5: Interconnection in an IP-based environmentCh 6: International interconnection, NGN and ICT developmentCh 7: NGN and USCh 8: Consumer Protection and QoSCh 9: Enabling environment for NGNCh 10: Why NGN, Why Now
8 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 NGNsInnovative Regulatory Policies Must Be Developed To Facilitate NGNs
9 Best Practice Guidelines on Innovative infrastructure sharing strategies to promote affordable access for allGlobal Symposium for Regulators (GSR) , Pattaya, Thailand, March 2008A. Promoting an enabling environment1. Appropriate Regulatory framework2. Competition and investment incentivesB. Innovative regulatory strategies and policies to promote infrastructure sharing1. Reasonable terms and conditions2. Pricing3. Efficient use of resources4. Scarce resources5. Licensing6. Conditions for sharing and interconnection7. Establishing an infrastructure sharing one-stop-shop8. Improving transparency and information sharing9. Dispute resolution mechanism10. Universal access11. Sharing with other market players and industries
10 Other useful information The 2007 Global Symposium for Regulators Best Practice Guidelines on Next Generation Networks migration, available at 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 atScott Marcus presentation to GSR 2007Workshop on NGN Interconnection in the Arab Region, Manama, Bahrain, May 2007, all presentations available atTREG link to NGN resources atOther Resources on NGN InterconnectionThe European Regulators’ Group Opinion on Regulatory Principles of Next Generation AccessThe Future of IP Interconnection, 29 January 2008, WIK Consulting,NGN UK website
11 Series Y.2… related NGN Recommendations Y.2000–Y.2099Frameworks and functional architecture modelsY.2100–Y.2199Quality of Service and performanceY.2200–Y.2249Service aspects: Service capabilities and service architectureY.2250–Y.2299Service aspects: Interoperability of services and networks in NGNY.2300–Y.2399Numbering, naming and addressingY.2400–Y.2499Network managementY.2500–Y.2599Network control architectures and protocolsY.2600–Y.2699dealing with future packet based networks Y.2700–Y.2799SecurityY.2800–Y.2899Generalized mobilityY.2900–Y.2999dealing with the carrier grade open environment15-16 December 2009Regional Workshop on NGN,Cairo, Egypt11
12 NGNITU-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.
14 NGN STRATUMSNGN 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.
17 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.
18 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.
19 BUILDING ELEMENTS FOR NGN DEVELOPMENT COUNTRY’S POLICY AND STRATEGY FOR BROADBANDREGULATORY POLICYMACRO AND MICROLEGACY REGULATION?OPERATORS BUSINESS MODELESMIGRATION OF FIXED/MOBILE NETWORKS OR BOTH TOWARDS NGNUSER DATA BASE AND USER’S DEMANDSBUSINESS CUSTOMERSINTERNATIONAL TRAFFIC AND VoIP19
20 STAKEHOLDERS’ EXPECTATIONS OPERATOR AND SERVICE PROVIDERSWant that:Investment is optimized, OPEX is cutNGN architecture leads to satisfactory QoS across multiple interconnected NGNContinuity of services offered to end-usersImprovements in network architectures , easy maintenance.Simplification and harmonization of services through single interface/multiple devicesQuick time to market for new serviceUSERSWill benefit from the ability of network operators and service providers to provide guaranteed QoS of voice services on NGNNew servicesCost reduction by sourcing voice and dataWant to switch between different communication devicesMANUFACTURERSWant to know that currently available terminals are suitable for use with NGN servicesConfirmation of network architecture suitability will give guidance of the required performance of routers and media gateways.REGULATORWant to have a better assurance that users are not adversely affected as PSTN services migrate to NGNPreserve competition
21 NETWORK OPERATORS/ SERVICE PROVIDERS, - Where and how to start?- PSTN optimization and consolidation?From NGNs drivers?CAPEX and OPEX reductionRevenue generation and protectionFMCIMSNG Access.Following examples from developed countries?Have EVOLUTIONARY OR REVOLUTIONARY APROACH?Have TOP-DOWN or BOTTOM-UP APPROACH212121
22 NETWORK OPERATORS, SERVICE PROVIDERS, CONTENT DEVELOPERS BUSINESS OPPORTUNITIESNGN remains the only way to preserve gradually declining revenuesFoster innovation dynamicNew services/substitution and service differentiationMarket share protection and possible growthSaving 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
23 High investment required: NETWORK OPERATORS, SERVICE PROVIDERS, CONTENT DEVELOPERS, -Business risk-High investment required:core – justified by cost savings and relatively low riskaccess –big demand uncertainties, major investment before demand are clear, type of regulationSimultaneous investment in NGN in fixed and mobileUncertainty about business modelEntrance of third party may diminish incumbent revenuesTechnical challengesNew legal environment and return of investment
24 MIGRATION CORE NETWORK DOMAIN ACCESS NETWORK DOMAIN rather easy to set up the migration planACCESS NETWORK DOMAINcompleximpact of the service provisionnot recommended to choose one specific technology to replace any legacy access network systems
26 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 networkExample scenarios from Rec. Y.2261Call 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
27 Scenario 1: Migration from LE Step 1Some 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 2Remaining 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.
29 Scenario 2: Migration from TE Step 1All 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 2All LEs are replaced by AG controlled by CSAccess 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.
31 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.
34 NGN DEVELOPMENT IN DEVELOPING COUNTRIES NGN development is linked to national broadband policyMore broadband, better NGNDenmark, N. Korea, IcelandLacking in many developing countriesLow penetration ratesIncumbent dominanceEconomy is not ICT basedEvolutionary paths different in developing and developed countries:Affordability and accessDegree of competitionPace and manner of reformLeverage opportunities?Who will be driver: Policy makers, Regulator, Operators, Customers
35 CONTENTS Doc: ITU-D/2/190Rev.2-E 1. Technological development ITU-D SG 2 Q.19-1/2: Guidelines for Migration of Existing Networks to Next-Generation Networks (NGN) for Developing CountriesCONTENTS1. Technological development2. NGN as a today’s solution3. NGN Technologies4.Migration to NGN5. Review from NGN Deployment6.Regulatory challenges raised by NGN migration7. Status of NGN Migration and further workDoc: ITU-D/2/190Rev.2-E
36 MIGRATION SCENARIOS Overlay Scenario Replace Scenario Mixed Scenario 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 ScenarioReplace ScenarioMixed Scenario
37 OVERLAY SCENARIOONGN 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
38 Infrastructure Replacement Scenario 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
39 Mixed ScenarioUses 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 connectionsUseful 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
40 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
41 Regional Workshop on NGN, Cairo, Egypt Developing countriesDeveloping 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)15-16 December 2009Regional Workshop on NGN, Cairo, Egypt41
42 THANK YOU FOR YOUR ATTENTION! Prof. dr Natasa GospicUniversity BelgradeTel:15-16 December 2009Regional Workshop on NGNCairo, Egypt42