By
Tilak De Silva
Chief Global & Network Officer
Sri Lanka Telecom Ltd.
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Copper Wires
Switch
MUX
Transmission Network
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Copper Wires - Access
Switch - Call control, Accounting (CDR)
MUX
- Aggregation
Transmission Network - Transport
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Access
Aggregation
Transport
Authentication, Authorization, Accounting
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Eg. Leased Line
Access – Copper, WiMAX
Aggregation - Data Node
Transport (TDM Transmission Network)
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Access - ADSL
Aggregation - DSLAM
Transport - MPLS
AAA
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Access - ADSL
Aggregation - DSLAM
Transport - MPLS
AAA
GSM Network
WiMAX Network
DSL Network
MPLS Network
MEN Network
DATA
Network
CDMA
Network
PSTN Network
Multiple Platform based Vertical Network Architecture
Services
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PSTN / ISDN
MSU/RSU/ELU
TDM Data network
TDM Tx Backbone
IP / MPLS Backbone
Metro Ethernet Network
Data Node
Other Operators
IP-DSLAM
MEN
Node
Different networks for different services … ? ? ?
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Service wise
Access, Aggregation & AAA
Separate staff for each service
More Space & power
NGN
IP / MPLS Backbone
MSAN
NGN architecture defined in
ITU-T Rec. Y.2012
IMS Functional Architecture Model
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Service Stratum
◦ Application Support Function and Service Support
Function
 Gateway
 Authentication & Authorization
◦ Service Control Function
 Resource Control
 Registration
 Authentication & Authorization
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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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Management Function
◦ Manage the NGN network in order to provide NGN
services with the expected Quality, Security and
Reliability.
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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
International Networks
TSC
ISC
TSC
TSC
CDMA/ PLMN
MSU
RSU
ISC
MSU
RSU
.....
MSU
RSU
MSU
ELU
RSU
Migration
&
Limitations
No vendor
support
Un repairable
hardware/
software
faults
Expansion/
Upgrading
not possible
Large customer base
Limited VAS
capacity
End of Life Time
No/ Limited
CLI capacity
Frequent failures
Supports only
R2 signaling
Technology
already
obsolete
CDR not
properly
generated for
Value Added
Services
Customer demand for
new features
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Why NGN……..
Pave the path
to fixed
Mobile
convergence
Cost effective
Operation and
Maintenance by
means of
High system
centralized
capabilities (Call network
handling,
management
Rapid
subscriber
Less cost for
system
capacity, traffic
transport network deployment of
handling, etc…..)
(MPLS backbone) new third party
applications due
due to
Availability of new
transportation of to open
services. (Unified
architecture
packets
messaging, IP
Centrex/Hosted PBX,
etc…)
High
One network
competitiveness
for all services
due to large
(Voice, Video
Less OPEX
number of
& Data)
manufactures
Less CAPEX …????
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PSTN to NGN Migration
Services
Session
Control
Transport
Access
Session Control Platform with
Enriched Features
Reliable Transport Network in
Higher Capacities
Widely Spreaded Access
Networks
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Transport & Access Networks
Transport
IP Network
Aggregation
Network
Aggregation
Network
PON
NodeB
WiMAX
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Only Copper to Home
Separate Fiber
to BTS
(2/3G,WiMAX)
O/F
Transport /
Aggregation
Network
Separate Fiber to AGW
O/F
PON
OLT
PON for both
AGW & Node B
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Subscriber
Operator
Mobile
Operator
Home location
in Mobile
network
Increasing mobility
Only one contract /one bill
Seamless services
home zone billing
Acquisition of new subscribers by new services
mainly with existing infrastructure / partly
shared infrastructure
Operator
Fixed & Mobile services
Fixed
Operator
Demand for New
FMC features
Mobility in
network
FMC is driven by increasing demand
for mobility in all networks
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Is concerned with the provision of network and service capabilities which
are independent of the access technique
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Does not necessarily imply physical convergence of networks
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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.
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An important feature of FMC is the separation of the subscriptions and
services from individual access points and terminals and
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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
HIGH
MEDIUM
BEST EFFORT
:
:
:
:
Better than today‘s PSTN/ISDN
Equivalent to today‘s PSTN/ISDN
Equivalent to today‘s wireless Networks
Significantly impaired but usable
Applications
Service QoS Class
and Priority
IP V6
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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.
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IP-based networks relevant to NGN can be classified into
◦ ‘IPv6-based NGN’, ‘IPv4-based NGN’, ‘IPv6-based non-NGN’, ‘IPv4-based non-NGN’
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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
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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