ngn architecture overview
DESCRIPTION
NGN Architecture Overview. Speaker: Chen-Nien Tsai Adviser: Kai-Wei Ke. Outlines. Introduction Use Cases for Next-Generation Networks NGN Architecture Overview Transport Stratum Functions Service Stratum Functions Management Functions End-User Functions Summary. Introduction (1/3). - PowerPoint PPT PresentationTRANSCRIPT
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NGN Architecture Overview
Speaker: Chen-Nien Tsai
Adviser: Kai-Wei Ke
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Outlines
IntroductionUse Cases for Next-Generation NetworksNGN Architecture Overview
Transport Stratum Functions Service Stratum Functions Management Functions End-User Functions
Summary
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Introduction (1/3)
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.
ITU-T: International Telecommunication Union—Telecommunication Standardization Sector
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Introduction (2/3)
Recommendations Y.2001 and Y.2011 are the results, and are now the basis for NGN studies in ITU-T.
In parallel with the ITU-T initiatives, several standards organizations initiated their plans for NGN standards. Possible incompatibilities among future NGN
standards.
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Introduction (3/3)
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.
ETSI: European Telecommunications Standards Institute
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Outlines
IntroductionUse Cases for Next-Generation NetworksNGN Architecture Overview
Transport Stratum Functions Service Stratum Functions Management Functions End-User Functions
Summary
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Use Case 1: Multimedia Conference
Product Designer
The supervisor
Sales
Project coordinator
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Use Case 2: Mobile Telemedicine
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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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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.
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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What’s Old: Vertically-Integrated Networks
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What’s New:Horizontally-integrated Network
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Outlines
IntroductionUse Cases for Next-Generation NetworksNGN Architecture Overview
Transport Stratum Functions Service Stratum Functions Management Functions End-User Functions
Summary
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NGN Architecture Overview (1/2)
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).
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NGN Architecture Overview (2/2)
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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Transport Stratum Functions (1/6)
Transport stratum provide IP connectivity for all components withi
n the NGN. It is responsible for providing end-to-end QoS. It is divided into access networks and the core n
etwork.
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Transport Stratum Functions (2/6)
Access Functions Manage end-user access to the network. They are access-technology-dependent.
Access Transport Functions They are responsible for transporting informatio
n across the access network. Also provide QoS control mechanisms.
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Transport Stratum Functions (3/6)
Edge Functions They are used for traffic processing when acces
s traffic is merged into the core network.
Core Transport Functions They are responsible for transporting informatio
n throughout the core network. Also provide QoS control mechanisms.
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Transport Stratum Functions (4/6)
Resource and Admission Control Functions (RACF) Provide admission control and gate control func
tionalities. Admission control involves checking authenticat
ion and authorization.
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Transport Stratum Functions (5/6)
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.
Transport User Profile Functions Represents the compilation of user and other
control data. May be specified and implemented as a set of
cooperating databases.
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Transport Stratum Functions (6/6)
Gateway Functions Provide capabilities to interwork with other netw
orks.
Media Handling Functions They are media resource processes for providin
g services.
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Service Stratum Functions (1/3)
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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Service Stratum Functions (2/3)
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.
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Service Stratum Functions (3/3)
Application Functions NGN support open APIs enabling third-party
service providers to create enhanced services.
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Management Functions
These functions enable the NGN operator to manage the network and provide NGN services with the expected quality, security, and reliability.
These functions include charging and billing functions.
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End-User Functions
End-user functions are connected to the NGN by the UNI.
No assumption are made about the diverse customer interfaces and customer network that may be connected to the NGN access network.
All customer equipment categories are supported in the NGN.
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Outlines
IntroductionUse Cases for Next-Generation NetworksNGN Architecture Overview
Transport Stratum Functions Service Stratum Functions Management Functions End-User Functions
Summary
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Summary (1/2)
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.
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Summary (2/2)
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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References
M. Carugi, B. Hirschman, and A. Narita, “Introduction to the ITU-T NGN Focus Group Release 1: Target Environment, Services, and Capabilities,” IEEE Communications Magazine, vol. 43, Oct. 2005, pp. 42 – 48.
K. Knightson, N. Morita, and T. Towle, “NGN Architecture: Generic Principles, Functional Architecture, and Implementation,” IEEE Communications Magazine, vol. 43, Oct. 2005, pp. 49 – 56.
Chae-Sub Lee and D. Knight, “Realization of the Next-Generation Network,” IEEE Communications Magazine, vol. 43, Oct. 2005, pp. 34 – 41.
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Backup Materials
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General Principles for NGN (1/2)
The NGN layered system and the seven-layer open systems interconnection basic reference model are different.
For NGN: The number of layers may not be seven. The functions of the individual layers may not
correspond to those of the OSI BRM. Certain prescribed or proscribed condition/
definitions in the OSI BRM may not be applicable.
And more.
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The Impact of NGN
The separation between the service stratum and the transport stratum.
The separation of access capabilities with core transport capabilities.
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General Principles for NGN
Divide functions into two distinct groups, or planes: Control plane. Management plane.
Grouping functions allows the functional interrelationships and information flows within a given group to be defined.
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General Functional Model