An Implementable NGN Architecture and Its Capabilities

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An Implementable NGN Architecture and Its
Capabilities

• By
• Tilak de Silva
• Chief Global Network Officer
• Sri Lanka Telecom Ltd.

09th April 2009
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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

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Vertical Network Scenario

• Multiple Platform based Vertical Network
  Architecture

Services
GSM Network
PSTN Network
CDMA Network
DATA Network
MEN Network
MPLS Network
DSL Network
WiMAX Network
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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 ? ? ?
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PSTN Network Hierarchy
International Networks
ISC
ISC
TSC
TSC
TSC
CDMA/ PLMN
MSU
MSU
MSU
MSU
. . . . .
RSU
RSU
RSU
ELU
RSU
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Future Network Converged Network Model
Application
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Migration Limitations
To NGN
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Why NGN..
NGN
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Future Network Structure
IP / MPLS Back Bone
NGN /IMS
MSAN
Other Operators
TDM Tx Network
Other Operators
CDMA Network
CDMA BTS
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Step by Step to ALL IP FMC
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NGN Architecture
NGN architecture defined in ITU-T Rec. Y.2012
IMS Functional Architecture Model
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• NGN architecture supports the delivery of
• PSTN and ISDN replacement
• Multimedia services
• Content delivery services
• Video streaming
• Broadcasting etc.

ITU-T Rec. Y.2012
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NGN Architecture

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

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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

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NGN Architecture

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

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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
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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

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QoS Speech Quality
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
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Applications
Service QoS Class and Priority
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NGN Access networks
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Transport Access Networks
AGW
AGW
PON
NodeB
WiMAX
AGW - Access Gateway
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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
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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

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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