Fixed Networks Migration towards NGN
Souheil MARINE
Product Strategy Manager
Why a Next Generation Network ?
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Convergence between the packet-based Internet and telephony
networks
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Take the best from each
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Service provision of the telephony network model
Openness and flexibility of the Internet model
Possible Definition of a Next Generation Network
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Driven by technological evolution
Demand for a network capable of introducing new services
A packet transport based network where the transport, control and
service layers are separated from each other and interact through
open interfaces
The target is well defined but how to reach it ?
ITU-BDT Seminar on Network Evolution,
Sofia, Bulgaria, 21- 24 Jan 2003— 2
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Migration Rationale
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Migration of current telephony networks (2 billion users worldwide)
should preserve the existing investments
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Key investments in any network are in provisioning access for endusers to the network services (80% of the costs)
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Migration must be driven by basic principles
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Any technological changes become costlier when they get closer to
end-users and should be justified by added value brought with them
Continuity of services offered to end-users
Inter-working between new and old technologies
Cost control of the migration process
Migration should above all be driven by economic considerations
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Network consolidation and optimization and/or
New revenues driven from new services
ITU-BDT Seminar on Network Evolution,
Sofia, Bulgaria, 21- 24 Jan 2003— 3
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Proposed Migration Approach
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Stepwise approach where each step is justified by new services
or advantages brought from consolidation
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The proposed migration steps are generic
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Application of each step depends on the specific operator context
All are not compulsory and do not follow in the same sequence
There is no “one size fits all” migration scenario
Network views of migration steps are not exhaustive
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Emphasis put on significant network elements needed for service
provision, on signaling relations between end-users and the
network and between network entities
Emphasis put on fixed access networks though the approach is very
similar for mobile networks evolution (see tomorrow’s presentation)
ITU-BDT Seminar on Network Evolution,
Sofia, Bulgaria, 21- 24 Jan 2003— 4
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Access to the Internet and Converged
Internet/Telephony services
Parlay, JAIN, SIP
ApGW
Application
Servers
WWW
Servers
STP
ISUP
ISDN/PRA
Transit
Basic Telephony
Services
ISUP
TDM
NAS
Local
Access Node
ITU-BDT Seminar on Network Evolution,
Sofia, Bulgaria, 21- 24 Jan 2003— 5
Packet Converged Voice
and data Services
Network
BAS
Local
Voice
Data
Signaling
Internet
Intelligent Network
Transit
Services
INAP
SS7
‘PINT’, ‘SPIRITS’
SCP
Dial-up DSL
Modem Modem
POTS,
ISDN
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DSLAM
Internet Access
Dial-up and DSL
Access to the Internet and Converged
Internet/Telephony services
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Basic telephony service and its associated supplementary services
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Intelligent Network Services
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Calling Cards, Free phone,Voice virtual private networks,…
Internet access
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TDM based transport
SS7 based signaling
In dial-up mode or in broadband mode with DSL technology
Converged Voice/data services
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Benefit from the simultaneous availability of a telephony access and
Internet access in the case of broadband Internet access
Examples of converged services: Click-to-Dial, Internet Call Waiting,
Web Augmented Calling, Unified Messaging,...
ITU-BDT Seminar on Network Evolution,
Sofia, Bulgaria, 21- 24 Jan 2003— 6
All rights reserved © 2003, Alcatel
Network consolidation: evolution towards multi-service
access nodes and Internet traffic optimization
Internet Dial-up
traffic connectivityInternet
in SS7
SCP
INAP
STP
SS7
ISUP
Switch Capacity
Enhancement
ISUP (IMT)
ISUP
V5.2
Voic
e
Multi-service
Access
Nodes
ATM, IP
Legacy and
Broadband
Access
POTS,
ISDN
ITU-BDT Seminar on Network Evolution,
Sofia, Bulgaria, 21- 24 Jan 2003— 7
Packet
Network
NAS
Local
V5.2 or
Local
proprietary
Multi-service
Access Node
Voice
Data
Signaling
Transit
TDM
BAS
DSLAM
ADSL-NT
Broadband
Access
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Network consolidation and introduction of
new multi-service access nodes
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Switch consolidation
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Maximize number of line, minimize number of nodes
Upgrade of switch fabric and processors for higher capacity and
speed
Access Consolidation
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Introduce NGN-ready multi-service access nodes
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End-user can be in native packet access mode
DSL but also other alternative next generation local loop technologies
(cable networks, wireless local loop, satellite,…)
Introduce Voice-over-DSL (loop emulation service) and extend voice
service offer without modification of the legacy switches
Optimize interconnection to the data network for dial-up access
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Interconnection at local exchanges level (offload transit level)
Use of ISUP and Inter Machine Trunks (IMT) instead of ISDN/PRA
ITU-BDT Seminar on Network Evolution,
Sofia, Bulgaria, 21- 24 Jan 2003— 8
All rights reserved © 2003, Alcatel
Voice over Packet for Trunking
INAP
ISUP, BICC, SIP-T
SCP
Internet Quality of
INAP
STP
SS7
H.248
ISUP
Voice Network
Transit ISUP
Consolidation
TDM
Transparency
of Packet Voice
use for end-user
services
Service
at Aggregate
level
Packet
Network
BICC
Offload of voice
traffic to packet
network
Local or
Transit
Local or
Transit
Integrated
Gateway
ITU-BDT Seminar on Network Evolution,
Sofia, Bulgaria, 21- 24 Jan 2003— 9
Switch with MGC
function
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Voice
Data
Voice/Packet
Signaling
Voice over Packet for Trunking
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Gradually offload voice trunking traffic to the packet network
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Network consolidation by removal of an upper transit level or
optimization within a transit level
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First mastering of voice over packet technology at aggregate level
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Voice-over-Packet trunking through integrated gateways in the
LEX/TEX
Alternative solution based on external trunking gateways controlled by
a Switch with Media Gateway Control (MGC) function
Use of SS7 based BICC signaling for co-existence with PSTN/ISDN
services
Reuse of existing IN services for business continuity
Simpler Quality of Service issues
Service transparency of Voice over Packet use for end-users
ITU-BDT Seminar on Network Evolution,
Sofia, Bulgaria, 21- 24 Jan 2003— 10
All rights reserved © 2003, Alcatel
Voice over packet up to access level
Switch with MGC
function
SCP
Internet
INAP
STP
ISUP
ISUP
SS7
H.248
Transit
Access Gateways
closer to end users
TDM
Local
AN
Voice
Data
Voice/ Packet
Signalling
ITU-BDT Seminar on Network Evolution,
Sofia, Bulgaria, 21- 24 Jan 2003— 11
Control of access
Packet gateways from
with MGC
NetworkSwitch
function
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DSLAM
Centralised
Access Gateway
Voice over packet for access
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Extend use of packet transport to the access network for voice
services
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Introduction of Access Gateways
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Access gateways are controlled by a switch with MGC function
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Integrated within next generation multi-service access nodes or
Standalone centralized access gateways
Same services portfolio as on the PSTN/ISDN
Tighter integration of voice and packet services
Improved network consolidation
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control of the voice traffic from fewer Switches with MGC function
Voice traffic gradually moved from the control of old generation
switching equipment to the control of upgraded MGC switches
ITU-BDT Seminar on Network Evolution,
Sofia, Bulgaria, 21- 24 Jan 2003— 12
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Multimedia Services
Application
Servers
Openness to 3rd
party services
SCP
Portal
INAP
STP
Next Generation
SS7
Access node handle
resources for MM calls
HTTP
SIP
Parlay
JAIN
SIP
ISUP
ISUP
H.248
Softswitch
SIP, H.323
Transit
TDM
AN
Voice/Packet
Signalling
ITU-BDT Seminar on Network Evolution,
Sofia, Bulgaria, 21- 24 Jan 2003— 13
Multimedia
Softswitch
Internet
ISUP
Local
Voice
Data
WWW
Servers
End-user
to softswitch
Packet dialogue with
Networknew protocols
BAS
DSLAM
End-users shift to
new terminals
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Multimedia Services
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End-users connected through next generation multi-service
access nodes will adopt IP terminals for multimedia services
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New IP terminals will be controlled by Multimedia Softswitches
through a new type of NGN signaling
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Better benefit of the high bandwidth, always-on and interactivity
associated with such next generation access networks
SIP or H.323
Access network will focus on resource provision under the softswitch
control depending on the service used
A multimedia softswitch offers network services but also third
party services through portals and open interface
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Network operator becomes the intermediary broker between
application providers and their clients
ITU-BDT Seminar on Network Evolution,
Sofia, Bulgaria, 21- 24 Jan 2003— 14
All rights reserved © 2003, Alcatel
Conclusions
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Services are key drivers for the evolution of telecom networks
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NGN is more than just broadband access to the Internet
Broadband access is a necessary but not sufficient condition ! It is
above all an enabler of new services with new revenues
NGN must build on the strengths of the telephony service model
albeit being based on technologies coming from the Internet
NGN emergence will happen but will take time
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PSTN networks will continue to provide the voice telephony service
for a while
State-of-the-art PSTN solutions of today will evolve to be part of the
future NGN picture
Some technical issues (QoS, naming, signaling) must be matured
for new NGN services to become a mass market phenomenon
NGN must above all bring new services to be meaningful
ITU-BDT Seminar on Network Evolution,
Sofia, Bulgaria, 21- 24 Jan 2003— 15
All rights reserved © 2003, Alcatel
www.alcatel.com
Thank You !
Questions ?