Modul 2 Architecture Functional NGN.pptx

Architecture Functional NGN

1. Architectur Functional NGN

2. NGN definition The “Converged” Next Generation Network (NGN) will provide: A multi-service, multi-protocol, multi-access, IP based network, secure, reliable and trusted Multi services: delivered by a common QoS enabled core network Multi-access : several access network; fixed and mobile terminals An enabler for service providers to offer Real-time and non-real-time communication services Flexible environment for rapid delivery of new services Nomadicity and mobility Of both users and devices Intra and inter network domains, eventually fully between Fixed and Mobile networks What is NGN? 2

3. NGN OPEX cost reduction Revenue enhancement Coping with various form of disruptive competition ( eg supply of VoIP) Market saturation of existing services Rapid / cost reduced supply of new services Renewal of old networks (e.g. PSTN) Deployment of single networks for any access networks 3 Business Driver

4. ITU NGN definition 4

5. NGN Basic Concept

6. NGN basic concept 6

7. 7 NGN Architecture Overview UNI NNI

8. Key concept for ngn architecture 8

9. Networking aspect 9

10. Re-distribution of service intelligence 10

11. Service separation 11 Transport only provide transfer between service platform

12. Decoupling services from transport network 12

13. NGN : ip as the network layer protocol 13

14. Basic function 14 Charging and billing function and management function are applied for both service and transport stratum UNI NNI

15. General principle to ngn functional architecture Support for multiple access technology The NGN functional architecture shall offer the configuration flexibility needed to support multiple access technologies Distributed control This will enable adaptation to the distributed processing nature of IP networks and support location transparency for distributed computing. Open control The network control interface should be open to support service creation, service updating, and incorporation of service logic provision by third parties Independent service provisioning The service provision process should be separated from network operation by using the above- mentioned distributed, open control mechanism. This is intended to promote a competitive environment for NGN development in order to speed up the provision of diversified value-added services. Support for services in converged network This is needed to generate flexible, easy-to-use multimedia services, by tapping the technical potential of the converged, fixed-mobile functional architecture of the NGN Enhance security and protection This is the basic principle of an open architecture. It is imperative to protect the network infrastructure by providing mechanisms for security and survivability in the relevant layers. Functional entity characteristics Functional entities should incorporate the following principles Functional entities may not be distributed over multiple physical units but may have multiple instances. Functional entities have no direct relationship with the layered architecture. However, similar entities may be located in different logical layers. 15 The NGN functional architecture shall incorporate the following principle

16. Transport stratum functions Transport function: Provide the connectivity for all components and physically separated functions within the NGN. Provide support for the transfer of media information, as well as the transfer of control and management information. Transport functions include : access network functions, edge functions, core transport functions, gateway functions, Media handling functions. 16 The transport stratum functions include : transport functions and transport control functions Transport user profile functions

17. Transport stratum functions The access network functions : Take care of end-users access to the network as well as collecting and aggregating the traffic coming from these accesses towards the core network. Also perform QoS control mechanisms dealing directly with user traffic, including : buffer management, queuing and scheduling, packet filtering, traffic classification, marking, policing, and shaping. The access network includes access-technology dependent functions, e.g. related to : Cable access xDSL access Wireless access, (IEEE802.11 and 802.16, 3G RAN access) Optical access 17 Transport functions include : access network functions, edge functions, core transport functions, gateway functions, and Media handling functions.

18. Transport stratum functions The edge functions : Merge media and traffic processing coming from different access networks into the core transport network; Support for QoS and traffic control. The edge functions are also used between core transport networks. The Core transport functions : responsible for ensuring information transport throughout the core network. Provide the means to differentiate the quality of transport in the core network. Provide QoS mechanisms dealing directly with user traffic, including : Buffer management queuing and scheduling, packet filtering traffic classification, marking, policing, shaping, gate control, and firewall capability. 18 Transport functions include : access network functions, edge functions, core transport functions, gateway functions, and Media handling functions.

19. Transport stratum functions Gateway function Provide capabilities to interwork with end-user functions and other networks, including other types of NGN and many existing networks, such as the PSTN/ISDN, the public Internet, and so forth. Gateway functions can be controlled either directly from the Service Control functions (see Section 6.2.1) or through the Transport control functions (see Section 6.1.2). Media handling functions Provides media resource processing for service g provision, such as generation of tone signals and trans- coding These functions are specific to media resource handling in the transport stratum. 19 Transport functions include : access network functions, edge functions, core transport functions, gateway functions, and Media handling functions.

20. Transport stratum functions Resource and Admission Control Functions (RACF), provide : QoS control (including resource reservation, admission control and gate control), NAPT and/or FW traversal control Functions over access and core transport networks. Admission control involves checking authorisation based on user profiles, SLAs, operator specific policy rules, service priority, and resource availability within access Within the NGN architecture, the RACF act as the arbitrator for resource negotiation and allocation between Service Control Functions and Transport Functions for Session-based applications (e.g. SIP call) and non-session based applications (e.g. Video Streaming) that require the control of NGN transport resource, including QoS control and NAPT/FW control and NAT Traversal control. The RACF interact with Transport Functions for the purpose of controlling one or more the following functions in the transport layer : • Packet filtering; Traffic classification, marking, policing, and priority handling; Bandwidth reservation and allocation; Network address and port translation; Firewall. 20 The Transport control functions include : Resource and Admission Control Functions (RACF) and Network Attachment Control Functions (NACF)

21. Transport stratum functions Resource and Admission Control Functions (RACF), provide : The RACF interact with Network Attachment Control Functions (NACF) including: network access registration, authentication and authorization, parameters configuration for checking user profiles and SLAs held by them. For those services across multiple providers or operators, Service Control Functions, RACF and Transport Functions may interact with the corresponding functions in other packet networks. 21 The Transport control functions include : Resource and Admission Control Functions (RACF) and Network Attachment Control Functions (NACF)

22. Transport stratum functions Network Attachment Control Functions (NACF) : Provide registration at the access level and initialization of end-user functions for accessing NGN services. These functions provide network level identification/ authentication, manage the IP address space of the access network, and authenticate access sessions. They also announce the contact point of NGN Service/Application support functions to the end user. The NACF provide the following functionalities : Dynamic provision of IP addresses and other user equipment configuration parameters. Authentication at the IP layer (and possibly other layers) Authorization of network access, based on user profiles. Access network configuration, based on user profiles. Location management at the IP layer 22 The Transport control functions include : Resource and Admission Control Functions (RACF) and Network Attachment Control Functions (NACF)

23. Transport stratum functions These functions take the form of a functional database representing the combination of a user’s information and other control data into a single "user profile“ function in the transport stratum. This functional database may be specified and implemented as a set of cooperating databases with functionalities residing in any part of the NGN. 23 Transport user profile functions

24. Service stratum functions Service control functions Include both session and non-session control, registration, and authentication and authorization function at the service level Include functions for controlling media resources Specialized resources Gateways at the service-signaling level Application/service support functions As gateway, registration, authentication, and authorization at the application level Work in conjunction with the service control functions to provide end-users and third party application providers with the value added services the request. Provide a reference point to the end-user functions (in case of third party call control for Click to Call service) through UNI Third party support functions are handled through the ANI reference point. Service user profile functions Represent the combination of user information and other control data into a single user profile function in the service stratum , in the form of a functional database 24 Abstract representation of the functional grouping in the service stratum includes the service control functions and the application/service support functions, as well as service user profiles.

25. End user functions No assumptions are made about the diverse end-user interfaces and end-user networks that may be connected to the NGN access network Different categories of end-user equipment are supported in the NGN , from single-line legacy telephones to complex corporate networks End-user equipment may be either mobile or fixed 25

26. Management functions Support for management is fundamental to the operation of the NGN These functions provide the ability to manage the NGN in order to provide NGN services with the expected quality, security, and reliability These functions are allocated in a distributed manner to each functional entity (FE) that interact with: Network element (NE) management Network management Service management FEs Management functions cover the following areas: Fault management Configuration management Accounting management Include charging and billing functions (CBF) Performance management Security management 26

27. Scope and extent of mobility levels 27

28. Home Gateway Functionality 28 QoS per device/terminal

29. Benefit of NGN Bandwidth saving 64 kbps compare to 8 kbps (ITU G.729) Saving about 7/8 = 87.5% Increasing level of network optimization Footprint comparison for 36.000 line PSTN : Softswitch = 13 racks : 1 rack 171.60 : 13.20 (converting for cost comparison) Power consumption PSTN : Softswitch = 600 A : 24 A 62.4 : 4.8 (converting for cost comparison) 29

30. Standard bodies involved 30

31. Cooperation with other standard bodies 3GPP TISPAN – IMS ATIS – US carrier requirements DSL Forum – Remote management of CPE IETF – IPv6, SIP extensions, MPLS, etc TMF – Standardized OSS components Open mobile alliance (OMA) – mobile applications, DRM Metro Ethernet Forum (MEF) – role of Ethernet in transport network IEEE 802.11x – WiFi hotspot 31

32. ATIS Next Generation Network (NGN) Framework Part I: NGN Definitions, Requirements, and Architecture * NOTE : ITU-T is recognized as the principal global organization for defining a global NGN standard. The ATIS NGNFG is primarily interacting with the ITU-T FGNGN; however it is recognized that other groups in ITU-T ( e.g., SG11, SG13) and other groups in ATIS ( e.g., PTSC) that are also concerned with aspects of the NGN.

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