Next Generation Networks Architecture Overview

1. NGN Architecture
Overview
IT-607
INSTRUCTOR: WAQAS AHMAD
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2. Outline
Introduction
Use Cases for Next-Generation Networks
NGN Architecture Overview
oTransport Stratum Functions
oService Stratum Functions
oManagement Functions
oEnd-User Functions
Summary
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3. Introduction
In July 2003, ITU-T organized a NGN workshop.
In considering the results of this workshop, ITU-T Study Group 13
launched an NGN Joint Rapporteur Group (NGN-JRG).
The NGN-JRG identified key issues and developed fundamental
standards for building the frameworks of an NGN.
Recommendations Y.2001 and Y.2011 are the results, and are now
the basis for NGN studies in ITU-T.
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ITU-T: International Telecommunication Union-Telecommunication Standardization Sector

4. Introduction
In parallel with the ITU-T initiatives, several standards organizations
initiated their plans for NGN standards.
Possible incompatibilities among future NGN standards.
After consulting ETSI and other organizations, ITU-T launched its
Focus Group on NGN (FGNGN) in June 2004.
This Focus Group was required to coordinate all aspects of NGN
studies.
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ITU-T: International Telecommunication Union-Telecommunication Standardization Sector

5. Key Aspects
Access to common services across multiple types of access
networks.
Coordination of multiple types of communications from a common
control point in the network.
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6. The Definition of an NGN
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.”
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7. The Definition of an NGN
It enables unfettered access for users to networks and competing
service providers and/or services of their choice.
It supports generalized mobility that will allow consistent and
ubiquitous provision of services to users.
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8. What’s Old?
Vertically-Integrated Networks
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9. What’s New?
Horizontally-Integrated Networks
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10. NGN Architecture Overview
 The NGN functions are divided into service and transport strata.
 End-user functions are connected to the NGN by the user-to-
network interface(UNI).
 Other networks are interconnected through the network-to-
network interface (NNI).
The application-to-network interface (ANI) forms a boundary with
respect to third party application providers.
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11. Transport Stratum Functions
Transport stratum provide IP connectivity for all
components within the NGN.
It is responsible for providing end-to-end QoS.
It is divided into access networks and the core network.
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12. Transport Stratum Functions
Access Functions
Manage end-user access to the network.
They are access-technology-dependent.
Manage end-user access to the network.
They are access-technology-dependent.
Access Transport Functions
They are responsible for transporting information across the access network.
Also provide QoS control mechanisms.
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13. Transport Stratum Functions
Edge Functions
They are used for traffic processing when access traffic is merged into
the core network.
Core Transport Functions
They are responsible for transporting information throughout the core
network.
Also provide QoS control mechanisms.
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14. Transport Stratum Functions
Resource and Admission Control Functions (RACF)
Provide admission control and gate control functionalities.
Admission control involves checking authentication and authorization.
Network Attachment Control Functions
Provide initialization of end-user functions for accessing NGN services.
Assist end-user equipment in registering and starting use of the NGN.
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15. Transport Stratum Functions
Transport User Profile Functions
Represents the compilation of user and other control data.
May be specified and implemented as a set of cooperating databases.
Gateway Functions
Provide capabilities to interwork with other networks.
Media Handling Functions
They are media resource processes for providing services.
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16. Service Stratum Functions
 These functions provide session-based and non-session based
services.
 Session-based services:
IP Telephony, videoconferencing, and video chatting.
 Non-session based services:
Video streaming and broadcasting.
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17. Service Stratum Functions
 Service and Control Functions
Include session control functions, a registration function, and
authentication and authorization functions at the service level.
Service User Profile Functions
Represents the compilation of user and other control data.
May be specified and implemented as a set of cooperating databases.
Application Functions
NGN support open APls enabling third-party service providers to
create enhanced services.
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18. Summary
 One of the important key features of the NGN is the separation
between different functionalities.
 Horizontally, the NGN is broken down into three sections:
Customer equipment, network equipment, and interconnection with
other networks.
Vertically, the NGN is separated into two areas:
 The service stratum and the transport stratum.
The NGN is no longer a next generation objective, but is becoming a
present generation reality.
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19. THANK YOU
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