NGN Architecture Overview

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

2. Outlines • Introduction • Use Cases for Next-Generation Networks • NGN Architecture Overview • Transport Stratum Functions • Service Stratum Functions • Management Functions • End-User Functions • Summary

3. 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. 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. 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. Outlines • Introduction • Use Cases for Next-Generation Networks • NGN Architecture Overview • Transport Stratum Functions • Service Stratum Functions • Management Functions • End-User Functions • Summary

7. Use Case 1: Multimedia Conference Sales The supervisor Project coordinator Product Designer

8. Use Case 2: Mobile Telemedicine

9. 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. 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. What’s Old: Vertically-Integrated Networks

12. What’s New:Horizontally-integrated Network

13. Outlines • Introduction • Use Cases for Next-Generation Networks • NGN Architecture Overview • Transport Stratum Functions • Service Stratum Functions • Management Functions • End-User Functions • Summary

15. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. Service Stratum Functions (3/3) • Application Functions • NGN support open APIs enabling third-party service providers to create enhanced services.

26. 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. 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. Outlines • Introduction • Use Cases for Next-Generation Networks • NGN Architecture Overview • Transport Stratum Functions • Service Stratum Functions • Management Functions • End-User Functions • Summary

29. 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. 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. 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

34. 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. The Impact of NGN • The separation between the service stratum and the transport stratum. • The separation of access capabilities with core transport capabilities.

37. 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. General Functional Model