Transcript NGN Migration

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 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
http://www.itu.int/ITU-D/study_groups/index.html
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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
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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 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
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Guidelines on migration of existing networks to NextGeneration 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
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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
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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
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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
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1. Appropriate Regulatory framework
2. Competition and investment incentives
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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
B. Innovative regulatory strategies and policies to promote
infrastructure sharing
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Other useful information
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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/ITUD/treg/Events/Seminars/GSR/GSR07/discussion_papers/JScott_Marcus_Interconnection_IPbased.pdf
Scott Marcus presentation to GSR 2007 http://www.itu.int/ITUD/treg/Events/Seminars/GSR/GSR07/Documents_presentations/Session_III%20Scott%20Marcus_i
nterconnect.pdf
Workshop on NGN Interconnection in the Arab Region, Manama, Bahrain, May 2007, all
presentations available at http://www.itu.int/ITUD/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/i
p_intercon_study_final.pdf
NGN UK website http://www.ngnuk.org.uk/
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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
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NGN

ITU-T Recommendation Y.2001 defined NGN as “A packetbased 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
e.g., Video services (TV, movie, etc.)
e.g., Data services (WWW, e-mail, etc.)
e.g., voice telephony services (audio, fax, etc.)
NGN services
CO-CS, CO-PS and CLPS layer technologies
NGN transport
NGN STRATUMS
Management plane
Control plane
User plane
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 service stratum
Management plane
Control plane
User plane
NGN transport 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
Service Stratum
Application Functions
User
Profile
Functions
Other M ultimedia
Components …
Streaming Services
Service
and
Control
Functions
Other N etworks
PSTN / ISDN Emulation
IP M ultimedia
Component
Legacy
Term inals
Network Access
Attachment Functions
NA AF
GW
Customer
Networks
NG N
Terminals
Custom er and
Term inal Functions
A ccess
Functions
Access Transport
Functions
Resource and Admission
Control Functions
RACF
Edge
Functions
Core transport
Functions
Transport Stratum
UNI
QoS Aspects and one part of Control aspect
(IP QoS signaling Requirement)
Release 1 coverage
NN I
A part of
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 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/ISDNlike 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:

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


USERS




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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



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
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

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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


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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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UAM
AN
UAM
LE
PSTN/ISDN
LE
PABX
PABX
TE
UAM
AN
TE
TE
UAM
AN
LE
LE
PABX
PABX
PSTN/ISDN
UAM
AN
AN
LE
TE
TE
UAM
TE
LE
PABX
AN
PABX
CS
TMG
SG
Packet Switched
Network
TMG
AN
AN
AG
AG
PABX
AG
PABX
CS
AN
AG
AG
PABX
AN
PABX
PABX
Packet Switched
Network
AG
AG
SG
TMG
Bearer and Signalling traffic from
other operator’s PSTN
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AN
AN
PABX
Voice
Signalling
Data
Scenario 1
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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UAM
Scenario 2
UAM
AN
PSTN/ISDN
LE
AN
LE
PABX
PABX
TE
UAM
AN
TE
TE
UAM
AN
LE
LE
PABX
PABX
UAM
UAM
CS
AN
LE
SG
PABX
SG
LE
PABX
Packet Switched
Network
UAM
LE
TMG
TMG
LE
AN
UAM
AN
SG
TMG
AN
PABX
PABX
Bearer and Signalling traffic from
other operator’s PSTN
CS
AG
PABX
AN
AG
AG
AG
Packet Switched
Network
AG
AG
PABX
TMG
SG
Bearer and Signalling traffic from
other operator’s PSTN
30
PABX
AN
PABX
Voice
Signalling
Data
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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UAM
UAM
AN
PSTN/ISDN
LE
AN
LE
PABX
PABX
TE
UAM
AN
TE
TE
UAM
AN
LE
LE
PABX
PABX
Scenario 3
CS
AG
PABX
AN
PABX
AG
AG
AG
Packet Switched
Network
AG
AG
TMG
SG
Bearer and Signalling traffic from
other operator’s PSTN
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PABX
AN
PABX
Voice
Signalling
Data
IMS-based evolution to NGN
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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
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
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
PSTN
PSTN
Emulation
NGN
NGN
NGN
Emulation
NGN
OVERLAY SCENARIOO
Users
Infrastructure

Starting
point

Overlay
NGN structure

Expansion of
NGN usage

Replacement of
remaining
infrastructure

Integration of
legacy users
⑥
Final stage
PSTN
legacy
legacy
PSTN
PSTN
NGN
NGN
legacy
NGN
PSTN
NGN
legacy
NGN
NGN
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
Infrastructure

Starting
point

Infrastructure
replacement

New service
introduction

Expansion
phase

Integration of
legacy users
⑥
Final stage
Users
PSTN
legacy
legacy
Emulation
NGN
(IMS)
Emulation
NGN
(IMS)
Emulation
NGN
NGN
NGN
legacy
legacy
NGN
NGN
NGN
•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
Infrastructure

Starting
point

Partial Infrastructure
replacement

New service
introduction

Expansion
phase

Integration of
legacy users
⑥ Final stage
Users
PSTN
legacy
legacy
PSTN
NGN
(IMS)
NGN
(IMS)
Emulation
NGN
legacy
NGN
IMS
NGN
NGN
NGN
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
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
THANK YOU FOR YOUR
ATTENTION!
Prof. dr Natasa Gospic
University Belgrade
Tel: +381 11 3091310
Email [email protected]
15-16 December 2009
Regional Workshop on NGN
Cairo, Egypt