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

By By

Tilak De SilvaTilak De SilvaChief Global & Network Officer Chief Global & Network Officer

Sri Lanka Telecom Ltd.Sri Lanka Telecom Ltd.

Copper Wires Switch MUX Transmission Network

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

Access Aggregation Transport Authentication, Authorization, Accounting

Eg. Leased Line

Access – Copper, WiMAX Aggregation - Data Node Transport (TDM Transmission Network)

Access - ADSL Aggregation - DSLAM Transport - MPLS AAA

Access - ADSL Aggregation - DSLAM Transport - MPLS AAA

Multiple Platform based Vertical Network ArchitectureMultiple Platform based Vertical Network Architecture

8

Services

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 … ? ? ?

Service wise Access, Aggregation & AAA

Separate staff for each service More Space & power

IP / MPLS Backbone

NGN MSAN

NGN architecture defined in ITU-T Rec. Y.2012

IMS Functional Architecture Model

Service Stratum◦ Application Support Function and Service Support

Function Gateway Authentication & Authorization

◦ Service Control Function Resource Control Registration Authentication & Authorization

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

Management Function◦ Manage the NGN network in order to provide NGN

services with the expected Quality, Security and Reliability.

ITU-T Rec. Y.2012ITU-T Rec. Y.2012

ISC ISC

MSU

TSCTSCTSC

MSU MSU MSU

CDMA/ PLMN

International Networks

RSU. . . . .

RSURSU ELU RSU

19

MigrationMigration &&

LimitationsLimitations

20

Why NGN…….. Why NGN……..

21

Transport IP Network

PON NodeBWiMAX

22

Transport & Access NetworksTransport & Access Networks

O/F

PONOLT

Only Copper to Home

Separate Fiberto BTS

(2/3G,WiMAX)

Separate Fiber to AGW

PON for both AGW & Node B

O/F

23

Increasing mobilityOnly one contract /one billSeamless serviceshome zone billing

Subscriber

Acquisition of new subscribers by new servicesmainly with existing infrastructure / partlyshared infrastructure

Operator

MobileOperator

FMC is driven by increasing demand for mobility in all networks

Home locationin Mobilenetwork

FixedOperator

Mobility innetwork

OperatorFixed & Mobile services

Demand for New FMC features

Demand for New FMC features

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

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/ISDNHIGH : Equivalent to today‘s PSTN/ISDNMEDIUM : Equivalent to today‘s wireless NetworksBEST EFFORT : Significantly impaired but usable

Applications

Service QoS Class and Priority

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 V6IP 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

IP V6IP V6