1. Migration Towards Converged Networks
FORUM ON NEXT GENERATION STANDARDIZATION (Colombo, Sri Lanka, 7-10 April 2009)
Migration Towards Converged Networks
Dr. Ghassem Koleyni
Colombo, Sri Lanka, 7-10 April 2009

2. Telecommunications network Network evolution Needs and expectations
Content
Telecommunications network
Network evolution
Needs and expectations
What is NGN?
PSTN & ISDN evolution to NGN
Standardization activities
Conclusion
Colmbo, Sri Lanka, 7-10 April 2009

3. Telecommunications Network
Core Network
Home
Network
Access
Network
Access Network
Home
Network
Colmbo, Sri Lanka, 7-10 April 2009

4. Network Evolution IP: Mid to late 1970’s (No QoS guaranteed)
Ethernet: at Xerox
ISDN: Mid to late 1980’s (QoS guaranteed while increasing the bandwidth, many new services )
X.25: Mid to late 1980’s (transmission of data without loss nor duplication)
FR: Mid to late 1980’s (QoS guaranteed while increasing the bandwidth)
ATM: Early 1990’s (guaranteed QoS, increased bandwidth, combined switching and transport capability with high level of performance and scalability)
Colmbo, Sri Lanka, 7-10 April 2009

5. Vertically-Integrated Networks
Voice
Services
Network
Data
Services
Network
Video
Services
Network
Different sets of services and networks
Reduced efficiency
Increased cost
Colmbo, Sri Lanka, 7-10 April 2009

6. Expectations (I) Reduced expenses Faster return on investment
Fewer core switches and transit exchanges
Reduced CAPEX & OPEX
Faster return on investment
Increased network efficiency and utilisation
Reduced deployment time
Fast and open service creation platform
One-stop shop for billing
A set of management functions shared between different services
Open services architecture
Colmbo, Sri Lanka, 7-10 April 2009

7. Expectations (II) Interoperable networks Faster service deployment
Standardized interfaces and protocols
Faster service deployment
Multimedia services support
Guaranteed QoS and QoS differentiation
Access agnostic (copper, cable, fibre, wireless)
Service continuity between fixed and mobile
Terminal portability
Increased bandwidth availability
Secure, reliable and simple (ease of use)
Affordable
Colmbo, Sri Lanka, 7-10 April 2009

8. The Evolution Trend Standardized Switching Services Transmission
Interfaces
Circuit- switched
Telephone services
TDM based
Proprietary
Packet- switched
Multimedia services
SDH, PDH, etc.
Standardized
Colmbo, Sri Lanka, 7-10 April 2009

9. NGN standardization in
ITU-T
Colmbo, Sri Lanka, 7-10 April 2009

10. Chronology of NGN Standardization in ITU-T
First workshop on NGN in ITU-T convened in Geneva, 9-10 July 2003
Meeting convened with cooperation from SGs 11, 13, 16 and SSG (predecessor to SG 19)
Presentations from different interest groups
SG 13 was tasked to lead study group on NGN
First JRG-NGN meeting, 29 September to 2 October 2003
Four draft Recommendations were generated
NGN Focus Group was formed in May 2004
Study Group 13 (NGN SG) established by WTSA-04 as the lead SG for NGN studies
NGN-GSI started in 2006 and is continuing
Colmbo, Sri Lanka, 7-10 April 2009

11. Next Generation Network (NGN)
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.
Source: ITU-T RecommendationY.2001
Colmbo, Sri Lanka, 7-10 April 2009

12. Different aspects of NGN (I)
Packet-based transfer 
Separation of control functions among bearer capabilities, call/session, and application/service
Decoupling of service provision from transport, and provision of open interfaces
Support for a wide range of services, applications and mechanisms based on service building blocks (including real time/streaming/non-real time services and multi-media)
Colmbo, Sri Lanka, 7-10 April 2009

13. Different aspects of NGN (II)
Broadband capabilities with end-to-end QoS and transparency
Interworking with legacy networks via open interfaces
Generalised mobility
Unfettered access by users to different service providers
A variety of identification schemes which can be resolved to IP addresses for the purposes of routing in IP networks 
Colmbo, Sri Lanka, 7-10 April 2009

14. Different aspects of NGN (III)
Unified service characteristics for the same service as perceived by the user
Converged services between Fixed and Mobile networks
Independence of service-related functions from underlying transport technologies
Support of multiple last mile technologies
Compliant with all Regulatory requirements, for example concerning emergency communications and security/privacy
Colmbo, Sri Lanka, 7-10 April 2009

15. In Brief
NGN, a single network providing services agnostic to the underlying transmission technologies and through different access networks
Simplicity
Increased productivity
Increase customer satisfaction
Increased revenue
Colmbo, Sri Lanka, 7-10 April 2009

16. Horizontally Integrated Network
Management plane
Control
User plane
NGN Services Stratum
Management plane
Control
User plane
NGN Transport Stratum
NGN Basic Reference Model (NGN BRM)
Colmbo, Sri Lanka, 7-10 April 2009

17. Separation of Services from Transport in NGN
NGN transport
NGN services
e.g., voice telephony services (audio, fax, etc.)
e.g., Data services (WWW, , etc.)
e.g., Video services (TV, movie, etc.)
CO-CS, CO-PS and CLPS layer technologies
Colmbo, Sri Lanka, 7-10 April 2009

18. General NGN Functional Model
Infrastructural, application, middleware and baseware services
Services
NGN
Service
Resources
Service management functions
Service control functions
Transport management functions
Transport control
functions s e c r
NGN
Transport u o s e R
Transfer functional area
Colmbo, Sri Lanka, 7-10 April 2009

19. Application Support Functions & Service Support Functions
ANI
Application Support Functions & Service Support Functions
Service User
Profiles
Service Control
Functions
Service stratum
Management Functions
Transport User
Profiles
Network Attachment
Control Functions
Resource and
Admission
Control Functions
End-User
Functions
Other
Networks
Transport Control Functions
Transport Functions
UNI
NNI
Transport stratum
Management
Media
Control
Colmbo, Sri Lanka, 7-10 April 2009 19

20. Re-distribution of Service Intelligence
Migration of
Service Intelligence
User
Core
Access
Colmbo, Sri Lanka, 7-10 April 2009

21. PSTN & ISDN
Evolution to NGN
Colmbo, Sri Lanka, 7-10 April 2009

22. What to consider when evolving PSTN/ISDN to NGN
Transport
Signalling and control
Management
Services
Bearer services
Supplementary services
Operation, administration and maintenance (OAM)
Naming, numbering and addressing
Accounting, charging and billing
Inter-working
National regulations
Emergency telecommunications
Security aspects
Colmbo, Sri Lanka, 7-10 April 2009

23. Call server (CS)-based
Different Approaches
Call server (CS)-based
Equipment re-use
Service continuity
IP multimedia sub-system (IMS)-based
Immediate migration
Access to new services
Colmbo, Sri Lanka, 7-10 April 2009

24. NGN: CS-based signalling Packet Switched Network Call Server PSTN AN
Cable, IAD, xDSL
Packet Switched
Network
Private Lines
Wireless AN
ISDN
PABX
signalling
Colmbo, Sri Lanka, 7-10 April 2009

25. Example of PSTN/ISDN Evolution
Colmbo, Sri Lanka, 7-10 April 2009

26. NGN: IMS-based Packet Switched Network signalling Other networks Other
Colmbo, Sri Lanka, 7-10 April 2009

27. PSTN/ISDN Emulation & Simulation
Provides PSTN/ISDN service capabilities and interfaces using adaptation to an IP infrastructure.
PSTN/ISDN simulation
Provides PSTN/ISDN-like service capabilities using session control over IP interfaces and infrastructure.
Colmbo, Sri Lanka, 7-10 April 2009

28. Emulation, Simulation, Interoperability and Interworking with NGN
(Carrier X)
(Carrier Y)
PLMN
PSTN/ISDN
Public IP NETWORK
User Equipment
SIMULATION
EMULATION
NNI
UNI
Colmbo, Sri Lanka, 7-10 April 2009

29. Evolution Strategy Transition cost Customer expectation
Business model
Customer expectation
Are customers ready for changes?
If higher expenses are involved, are customerst ready to pay?
Choice of technology
Products and services to be offered
Domestic regulations
Colmbo, Sri Lanka, 7-10 April 2009

30. NGN Recommendations, Y Series
Frameworks and functional architecture models
Y.2000–Y.2099
Quality of Service and performance
Y.2100–Y.2199
Service aspects: Service capabilities and service architecture
Y.2200–Y.2249
Service aspects: Interoperability of services and networks in NGN
Y.2250–Y.2299
Numbering, naming and addressing
Y.2300–Y.2399
Network management
Y.2400–Y.2499
Network control architectures and protocols
Y.2500–Y.2599
Security
Y.2700–Y.2799
Generalized mobility
Y.2800–Y.2899
Colmbo, Sri Lanka, 7-10 April 2009

31. NGN Recommendations, Q Series
General
Q.3000–Q.3029
Network signalling and control functional architecture
Q.3030–Q.3099
Network data organization within the NGN
Q.3100–Q.3129
Bearer control signalling
Q.3130–Q.3179
Signalling and control requirements and protocols to support attachment in NGN environments
Q.3200–Q.3249
Resource control protocols
Q.3300–Q.3369
Service and session control protocols
Q.3400–Q.3499
Service and session control protocols – supplementary services
Q.3600–Q.3649
NGN applications
Q.3700–Q.3849
Testing for NGN networks
Q.3900–Q.3999
Colmbo, Sri Lanka, 7-10 April 2009

32. Conclusion
Substantial progress has been made in the preparation of specifications addressing evolution of networks to NGN
Good progress on signalling and protocol work
More work needs to be done, specifically on the OAM, management and control & signalling aspects
Compliance to global standards would reduce procurement costs and promote inter-operability
Colmbo, Sri Lanka, 7-10 April 2009

33. List of Acronyms ) ADF Adaptation Function AG Access Gateway
AN Access Network
ANI Application Network Interface
ATM Asynchronous Transfer Mode
CAPEX CAPital EXpenditure
CO-CS connection-oriented circuit- switched
CO-PS connection-oriented packet- switched
CLPS connectionless packet- switched
CS Call Server
DSL Digital Subscriber Line
DTE Data Terminal Equipment
FR Frame Relay
IAD Integrated Access Device
IMS IP Multimedia Sub-system
IP Internet Protocol
ISDN Integrated Services Digital Network
IWF Inter-working Function
LE Local Exchange
NGN Next Generation Network
NNI Network Network Interface
OAM Operation, Administration, Maintenance
OPEX OPerating EXpenditure
PABX Private Automatic Branch eXchange
PBX Private Branch eXchange
PDH Plesiochronous Digital Hierarchy
PLMN Public Land Mobile Network
PSPDN Packet Switched Public Data Network
PSTN Public Switched Telephone Network
QoS Quality of Service
REV Reverse Charging
SDH Synchronous Digital Hierarchy
SG Signalling Gateway
SIP Session Initiation Protocol
TDM Time Division Multiplexing
TE Transit Exchange
TMG Trunking Media Gateway
TV Television
UAM User Access Module
UNI User-Network Interface
WWW World Wide Web
Colmbo, Sri Lanka, 7-10 April 2009

34. Thank you for your attention
Dr. Ghassem Koleyni
Tel:
Colmbo, Sri Lanka, 7-10 April 2009

35. Back up slides
Colmbo, Sri Lanka, 7-10 April 2009

36. ITU-T NGN Related Recommendations (Q Series)
Signalling architecture for the NGN service control plane
Q.3150
Use of virtual trunks for ATM/MPLS client/server control plane interworking  
Q.3151
ATM and frame relay/MPLS control plane interworking: Client-server  
Q.3201
EAP-based security signalling protocol architecture for network attachments   Q
Authentication protocols based on EAP-AKA for interworking among 3GPP, WiMax, and WLAN in NGN  
Q.3300
Architectural framework for the Q.33xx series of Recommendations   Q
Resource control protocol - Protocol at the Rs interface   Q
Resource control protocol - Protocol at the Rp interface  
Colmbo, Sri Lanka, 7-10 April 2009

37. ITU-T NGN Related Recommendations (Q Series)
Protocol at the interface between a Policy Decision Physical Entity (PD-PE) and a Policy Enforcement Physical Entity (PE-PE) (Rw interface): Overview   Q
Protocol at the interface between a Policy Decision Physical Entity (PD-PE) and a Policy Enforcement Physical Entity (PE-PE): COPS Alternative   Q
Protocol at the interface between a Policy Decision Physical Entity (PD-PE) and a Policy Enforcement Physical Entity (PE-PE) (Rw interface): H.248 Alternative   Q
Protocol at the interface between the policy decision physical entity (PD-PE) and the policy enforcement physical entity (PE-PE) (Rw interface): Diameter   Q
Resource control protocol no. 4 (rcp4). Protocol at the interface between a transport resource control physical entity (TRC-PE) and a transport physical entity (T-PE) (Rc interface): COPS alternative  
Colmbo, Sri Lanka, 7-10 April 2009

38. ITU-T NGN Related Recommendations (Q Series)
Resource control protocol no. 4 SNMP Profile. Protocol at the Rc interface between a transport resource control physical entity (TRC-PE) and a transport physical entity (T-PE) (Rc interface)   Q
Resource control protocol - Protocol at the Rt interface  
Q.3401
NGN NNI signalling profile  
Q.3402
NGN UNI signalling profile (Protocol set 1)  
Q.3900
Methods of testing and model network architecture for NGN technical means testing as applied to public telecommunication networks  
Q.3901
Distribution of tests and services for NGN technical means testing in the model and operator networks  
Q.3902
Parameters to be monitored in the process of operation when implementing NGN technical means in public telecommunication networks  
Colmbo, Sri Lanka, 7-10 April 2009

39. ITU-T NGN Related Recommendations (Y Series)
General overview of NGN
Y.2011
General principles and general reference model for Next Generation Networks  
Y.2012
Functional requirements and architecture of the NGN    
Y.2014
Network attachment control functions in next generation networks  
Y.2015
General requirements for ID/locator separation in NGN  
Y.2021
IMS for Next Generation Networks 
Y.2031
PSTN/ISDN emulation architecture    
Y.2051
General overview of IPv6-based NGN    
Y.2052
Framework of multi-homing in IPv6-based NGN    
Y.2053
Functional requirements for IPv6 migration in NGN    
Y.2054
Framework to support signalling for IPv6-based NGN    
Y.2091
Terms and definitions for Next Generation Networks  
Y.2111
Resource and admission control functions in Next Generation Networks  
Colmbo, Sri Lanka, 7-10 April 2009

40. ITU-T NGN Related Recommendations (Y Series)
A QoS control architecture for Ethernet-based IP access network  
Y.2113
Ethernet QoS control for next generation networks 
Y.2121
Requirements for the support of flow state aware transport technology in an NGN  
Y.2171
Admission control priority levels in Next Generation Networks  
Y.2172
Service restoration priority levels in Next Generation Networks  
Y.2173
Management of performance measurement for NGN  
Y.2174
Distributed RACF architecture for MPLS networks  
Y.2201
NGN release 1 requirements  
Y.2211
IMS-based real time conversational multimedia services over NGN  
Y.2212
Requirements of managed delivery services  
Y.2213
NGN service requirements and capabilities for network aspects of applications and services using tag-based identification  
Y.2232
NGN convergence service model and scenario using Web Services  
Colmbo, Sri Lanka, 7-10 April 2009

41. ITU-T NGN Related Recommendations (Y Series)
Requirements and framework allowing accounting and charging capabilities in NGN  
Y.2234
Open service environment capabilities for NGN
Y.2235
Converged web-browsing service scenarios in NGN
Y.2261
PSTN/ISDN evolution to NGN  
Y.2262
PSTN/ISDN emulation and simulation  
Y.2271
Call server based PSTN/ISDN emulation  
Y.2401
Principles for the Management of the Next Generation Networks  
Y.2601
Fundamental characteristics and requirements of future packet based networks  
Y.2611
High level architecture of future packet based networks  
Y.2701
Security requirements for NGN release 1  
Y.2801
Mobility management requirements for NGN  
Y.2802
Fixed-mobile convergence general requirements  
Y.2803
FMC service using legacy PSTN or ISDN as the fixed access network for mobile network users
Y.2804
Generic framework of mobility management for next generation networks  
Colmbo, Sri Lanka, 7-10 April 2009

42. Useful Links ITU http://www.itu.int
NGN Global Standards Initiative (NGN-GSI)
SG11 (Signalling & Control Protocols)
SG 13 (Future Networks and NGN)
Colmbo, Sri Lanka, 7-10 April 2009