An Implementable NGN Architecture and Its Capabilities

1. An Implementable NGN Architecture and Its Capabilities By Tilak de Silva Chief Global & Network Officer Sri Lanka Telecom Ltd. 09th April 2009

2. Agenda • Overall functional architecture of an implementable NGN • Functional architecture for supporting mobility & realization of FMC environment • Architectural point view of “QoS” & “network performance” to meet NGN service requirement from users & providers • Relevance of IPv6 for NGN transportation • NGN Access networks • Underline network support capabilities essential for successful NGN

3. Vertical Network Scenario Multiple Platform based Vertical Network Architecture Services GSM Network PSTN Network CDMA Network DATA Network MEN Network MPLS Network DSL Network WiMAXNetwork

4. Existing Network Structure TDM Tx Back Bone PSTN / ISDN MSU/RSU/ELU TDM Data network Data Node CDMA Network CDMA BTS Other Operators IP / MPLS Back Bone IP-DSLAM Metro Ethernet Network MEN Node Different networks for different services … ? ? ?

5. PSTN Network Hierarchy International Networks ISC ISC TSC TSC TSC CDMA/ PLMN MSU MSU MSU MSU . . . . . RSU RSU RSU ELU RSU

6. Future Network “Converged Network Model” Application

7. Migration & Limitations To NGN

8. Why NGN…….. NGN

9. Future Network Structure IP / MPLS Back Bone NGN /IMS MSAN Other Operators TDM Tx Network Other Operators CDMA Network CDMA BTS

10. ALL IP + Voice TDM → ALL IP ALL IP → FMC ALL IP + Multimedia Control Layer Softswitch ALL IP + FMC IMS PSTN Transport Layer MPLS IP OSS / BSS Convergence Service-based IP QoS Database Convergence Access Layer MSAN + DSLAM MSAN + DSLAM + HGW Industry Chain Ready IAD / SIP Phone Time of maturity and popularity Step by Step to ALL IP & FMC

11. NGN Architecture NGN architecture defined in ITU-T Rec. Y.2012 IMS Functional Architecture Model

12. NGN architecture supports the delivery of: • PSTN and ISDN replacement • Multimedia services • Content delivery services • Video streaming • Broadcasting etc. ITU-T Rec. Y.2012

13. NGN Architecture • Service Stratum • Application Support Function and Service Support Function • Gateway • Authentication & Authorization • Service Control Function • Resource Control • Registration • Authentication & Authorization

14. NGN Architecture • Transport Stratum • Transport Control Function • IP connectivity services to NGN users • Network Attachment Control Functions (NACF) • Resource and Admission Control Functions (RACF) • To get desired QoS for communication • To get permission to access certain resources • Transport Function • Core Transport Functions • Access Transport Functions

15. NGN Architecture • Management Function • Manage the NGN network in order to provide NGN services with the expected Quality, Security and Reliability.

16. Mobility & Realization of FMC Environment • Increasing mobility • Only one contract /one bill • Seamless services • home zone billing Subscriber • Acquisition of new subscribers by new services • mainly with existing infrastructure / partly • shared infrastructure Operator Operator Fixed & Mobile services Mobile Operator Fixed Operator Home location in Mobile network Demand for New FMC features Mobility in network FMC is driven by increasing demand for mobility in all networks

17. Fixed Mobile Convergence • Is concerned with the provision of network and service capabilities which are independent of the access technique • Does not necessarily imply physical convergence of networks • Is concerned with the development of converged network capabilities and supporting standards to offer consistent services, that may be used via fixed or mobile access to fixed or mobile, public or private networks. • An important feature of FMC is the separation of the subscriptions and services from individual access points and terminals and • The possibility of internetwork roaming using the same consistent set of services

18. QoS Speech Quality • An Operator will regard the “Customer‘s view“ as essential; • (e.g. will take into account QoS classification) • Classes: • BEST : Better than today‘s PSTN/ISDN • HIGH : Equivalent to today‘s PSTN/ISDN • MEDIUM : Equivalent to today‘s wireless Networks • BEST EFFORT : Significantly impaired but usable

19. Applications Service QoS Class and Priority

20. NGN Access networks

21. Transport IP Network Aggregation Network Aggregation Network Transport & Access Networks AGW AGW PON NodeB WiMAX AGW - Access Gateway

22. Transport / Aggregation Network Only Copper to Home Separate Fiber to BTS (2/3G,WiMAX) AGW O/F AGW Separate Fiber to AGW O/F PON for both AGW & Node B AGW PON OLT AGW

23. IP V6 • IPv6 is emerging to form the basis of the NGNs and well-defined IPv6 suite will provides considerable flexibility to NGN by • Improving network provisioning and operations, as well as Services to be offered to the NGN providers and users. • IP-based networks relevant to NGN can be classified into • ‘IPv6-based NGN’, ‘IPv4-based NGN’, ‘IPv6-based non-NGN’, ‘IPv4-based non-NGN’ • Addressing schemes, QoS, Security and Mobility are the key features of IPv6 which may significantly impact on NGN Overview of IPv6-based NGN

24. IP V6 • IPv6 to NGN • Enhanced service capabilities • Enables congestion/flow control using additional QoS information such as flow label, etc. The flow label field of IPv6 header enables IPv6 flow identification independently of transport layer protocols • Any-to-any IP connectivity • IPv6 offers the advantages of localizing traffic with unique local addresses, while making some devices globally reachable by assigning addresses which are scoped globally • Self-organization and service discovery using autoconfiguration • Address auto-configuration of IPv6 protocol will facilitate NGNs to support dynamic address assignments and multiple user/network identities • Multi-homing using IPv6 addressing • IPv6 can handle multiple heterogeneous access interfaces and/or multiple IPv6 addresses through single or multiple access interfaces. Multi-homing can provide redundancy and fault tolerance