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Cairo (Egypt), December 2009

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1 Cairo (Egypt), 15-16 December 2009
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), December 2009

2 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

SG 1: Telecommunication development strategies and policies National 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

4 ITU-D SG 1 and NGN Q 6-2/1: Regulatory impact of next-generation networks on interconnection Q 7-2/1: Regulatory policies on universal access to broadband services Q 10-2/1: Regulation for licensing and authorization of converging services Q 12-2/1: Tariff policies, tariff models and methods of determining the costs of services on national telecommunication networks, including next-generation networks

Q 18-1/2: Implementation aspects of IMT-2000 and information-sharing on systems beyond IMT-2000 for developing countries Q 19-1/2: Strategy for migration from existing networks to next-generation networks for developing countries Q 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 countries Question 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 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

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 NGNs Innovative Regulatory Policies Must Be Developed To Facilitate NGNs

9 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

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 at Scott Marcus presentation to GSR 2007 Workshop on NGN Interconnection in the Arab Region, Manama, Bahrain, May 2007, all presentations available at TREG link to NGN resources at Other Resources on NGN Interconnection The European Regulators’ Group Opinion on Regulatory Principles of Next Generation Access The Future of IP Interconnection, 29 January 2008, WIK Consulting, NGN UK website

11 Series Y.2… related NGN Recommendations
Y.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 15-16 December 2009 Regional Workshop on NGN, Cairo, Egypt 11

12 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.

13 Separation of services from transport in NGN

14 NGN STRATUMS 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.

15 Coverage of ITU-T NGN Release 1

16 NGN architecture described in ITU-T Y.2012

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 NGN To 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.

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.


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

21 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 21 21 21

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

23 High investment required:
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

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

25 Generic view of Core Network migration to NGN

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

27 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.

28 Scenario 1

29 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.

30 Scenario 2

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.

32 Scenario 3

33 IMS-based evolution to NGN

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

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 Countries CONTENTS 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

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 Scenario Replace Scenario Mixed Scenario

37 OVERLAY SCENARIOO 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

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 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

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 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) 15-16 December 2009 Regional Workshop on NGN, Cairo, Egypt 41

Prof. dr Natasa Gospic University Belgrade Tel: 15-16 December 2009 Regional Workshop on NGN Cairo, Egypt 42

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