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An Implementable NGN Architecture and Its Capabilities

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Presentation on theme: "An Implementable NGN Architecture and Its Capabilities"— Presentation transcript:

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

2 PSTN Network Copper Wires Switch MUX Transmission Network

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

4 Service Access Aggregation Transport
Authentication, Authorization, Accounting

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

6 Internet Access - ADSL Aggregation - DSLAM Transport - MPLS AAA

7 IPTV Access - ADSL Aggregation - DSLAM Transport - MPLS AAA

8 Vertical Network Scenario
Multiple Platform based Vertical Network Architecture Services PSTN Network CDMA Network DATA Network MEN Network MPLS Network DSL Network GSM Network WiMAX Network In SLT we have different vertically positioned networks providing different services. They use different access NWs, different transport NWs. If we confined into unified network architecture, we can leverage on present NWs and services. Need to identify and migrate into such network architecture where can give more focused to the seamless rollout of new services/applications

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

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

11 NGN Structure IP / MPLS Backbone NGN MSAN

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

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

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

17 Sri Lanka Telecom Architecture

18 PSTN Network Hierarchy

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

20 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 Why NGN…….. 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 Less CAPEX …???? Less OPEX One network for all services (Voice, Video & Data)

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

22 Transport & Access Networks
Transport IP Network Wide Coverage Resilience Network Equipment Redundancy High Capacity AGW Aggregation Network Aggregation Network AGW PON NodeB WiMAX AGW - Access Gateway

23 Transport / Aggregation Network
Only Copper to Home Transport / Aggregation Network 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

24 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-zone billing: whereby customers enjoy a competitive rate, whenever they are in a certain geographical area of their choice Home location in Mobile network Demand for New FMC features Mobility in network FMC is driven by increasing demand for mobility in all networks

25 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

26 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

27 Applications Service QoS Class and Priority

28 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

29 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 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

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