1. NGN Architecture Overview Speaker: Chen-Nien Tsai Adviser: Kai-Wei Ke

2. 2005/12/62 Outlines Introduction Use Cases for Next-Generation Networks NGN Architecture Overview  Transport Stratum Functions  Service Stratum Functions  Management Functions  End-User Functions Summary

3. 2005/12/63 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

4. 2005/12/64 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.

5. 2005/12/65 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

6. 2005/12/66 Outlines Introduction Use Cases for Next-Generation Networks NGN Architecture Overview  Transport Stratum Functions  Service Stratum Functions  Management Functions  End-User Functions Summary

7. 2005/12/67 Use Case 1: Multimedia Conference Product Designer The supervisor Sales Project coordinator

8. 2005/12/68 Use Case 2: Mobile Telemedicine

9. 2005/12/69 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.

10. 2005/12/610 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.

11. 2005/12/611 What’s Old: Vertically-Integrated Networks

12. 2005/12/612 What’s New: Horizontally-integrated Network

13. 2005/12/613 Outlines Introduction Use Cases for Next-Generation Networks NGN Architecture Overview  Transport Stratum Functions  Service Stratum Functions  Management Functions  End-User Functions Summary

14. 2005/12/614

15. 2005/12/615 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).

16. 2005/12/616 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.

17. 2005/12/617 Transport Stratum Functions (1/6) 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.

18. 2005/12/618 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 information across the access network.  Also provide QoS control mechanisms.

19. 2005/12/619 Transport Stratum Functions (3/6) 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.

20. 2005/12/620 Transport Stratum Functions (4/6) Resource and Admission Control Functions (RACF)  Provide admission control and gate control functionalities.  Admission control involves checking authentication and authorization.

21. 2005/12/621 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.

22. 2005/12/622 Transport Stratum Functions (6/6) Gateway Functions  Provide capabilities to interwork with other networks. Media Handling Functions  They are media resource processes for providing services.

23. 2005/12/623 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.

24. 2005/12/624 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.

25. 2005/12/625 Service Stratum Functions (3/3) Application Functions  NGN support open APIs enabling third-party service providers to create enhanced services.

26. 2005/12/626 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.

27. 2005/12/627 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.

28. 2005/12/628 Outlines Introduction Use Cases for Next-Generation Networks NGN Architecture Overview  Transport Stratum Functions  Service Stratum Functions  Management Functions  End-User Functions Summary

29. 2005/12/629 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.

30. 2005/12/630 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.

31. 2005/12/631 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.

32. Backup Materials

33. 2005/12/633

34. 2005/12/634 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.

35. 2005/12/635 The Impact of NGN The separation between the service stratum and the transport stratum. The separation of access capabilities with core transport capabilities.

36. 2005/12/636

37. 2005/12/637 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.

38. 2005/12/638 General Functional Model