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By Tilak De Silva Chief Global & Network Officer Sri Lanka Telecom Ltd.

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Presentation on theme: "By Tilak De Silva Chief Global & Network Officer Sri Lanka Telecom Ltd."— Presentation transcript:

1 By Tilak De Silva Chief Global & Network Officer Sri Lanka Telecom Ltd.

2 Copper Wires Switch MUX Transmission Network

3 Copper Wires - Access Switch - Call control, Accounting (CDR) MUX - Aggregation Transmission Network - Transport

4 Access Aggregation Transport Authentication, Authorization, Accounting

5 Eg. Leased Line Access – Copper, WiMAX Aggregation - Data Node Transport (TDM Transmission Network)

6 Access - ADSL Aggregation - DSLAM Transport - MPLS AAA

7 Access - ADSL Aggregation - DSLAM Transport - MPLS AAA

8 Multiple Platform based Vertical Network Architecture 8 PSTN Network GSM Network CDMA Network DATA Network MEN Network MPLS Network Services DSL Network WiMAX Network

9 TDM Tx Backbone IP / MPLS Backbone Metro Ethernet Network PSTN / ISDN TDM Data network MSU/RSU/ELU Data Node IP-DSLAM MEN Node Other Operators Different networks for different services … ? ? ?

10 Service wise Access, Aggregation & AAA Separate staff for each service More Space & power

11 IP / MPLS Backbone NGN MSAN

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

13 Service Stratum Application Support Function and Service Support Function Gateway Authentication & Authorization Service Control Function Resource Control Registration Authentication & Authorization

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

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


18 ISC MSU TSC MSU CDMA/ PLMN International Networks RSU..... RSU ELURSU

19 End of Life Time Large customer base No vendor support Un repairable hardware/ software faults Expansion/ Upgrading not possible 19 Supports only R2 signaling Frequent failures No/ Limited CLI capacity Limited VAS capacity Customer demand for new features Technology already obsolete CDR not properly generated for Value Added ServicesMigration &Limitations

20 20 Less CAPEX …???? Less OPEX One network for all services (Voice, Video & Data) Why NGN…….. High competitiveness due to large number of manufactures Availability of new services. (Unified messaging, IP Centrex/Hosted PBX, etc…) Less cost for transport network (MPLS backbone) due to transportation of packets Rapid deployment of new third party applications due to open architecture High system capabilities (Call handling, subscriber capacity, traffic handling, etc…..) Cost effective Operation and Maintenance by means of centralized network management system Pave the path to fixed Mobile convergence

21 Transport Access Session Control Services 21 PSTN to NGN Migration Session Control Platform with Enriched Features Reliable Transport Network in Higher Capacities Widely Spreaded Access Networks

22 Transport IP Network Aggregation Network PON NodeB WiMAX 22 Transport & Access Networks

23 Transport / Aggregation Network O/F PON OLT Only Copper to Home Separate Fiber to BTS (2/3G,WiMAX) Separate Fiber to AGW PON for both AGW & Node B O/F 23

24 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 Mobile Operator FMC is driven by increasing demand for mobility in all networks Home location in Mobile network Fixed Operator Mobility in network Operator Fixed & Mobile services Demand for New FMC features

25 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

26 An Operator will regard the Customers view as essential; (e.g. will take into account QoS classification) Classes: BEST: Better than todays PSTN/ISDN HIGH: Equivalent to todays PSTN/ISDN MEDIUM: Equivalent to todays wireless Networks BEST EFFORT: Significantly impaired but usable

27 Applications Service QoS Class and Priority

28 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 IP V6

29 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 auto configuration 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 IP V6

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