Post on 21-Jun-2020
Fixed Networks Migration towards NGN
Souheil MARINEProduct Strategy Manager
All rights reserved © 2003, AlcatelITU-BDT Seminar on Network Evolution,Sofia, Bulgaria, 21- 24 Jan 2003— 2
Why a Next Generation Network ?
> Convergence between the packet-based Internet and telephonynetworks• Driven by technological evolution• Demand for a network capable of introducing new services
> Take the best from each• Service provision of the telephony network model• Openness and flexibility of the Internet model
> Possible Definition of a Next Generation Network• A packet transport based network where the transport, control and
service layers are separated from each other and interact throughopen interfaces
> The target is well defined but how to reach it ?
All rights reserved © 2003, AlcatelITU-BDT Seminar on Network Evolution,Sofia, Bulgaria, 21- 24 Jan 2003— 3
Migration Rationale
> Migration of current telephony networks (2 billion users worldwide)should preserve the existing investments
> Key investments in any network are in provisioning access for end-users to the network services (80% of the costs)• Any technological changes become costlier when they get closer to
end-users and should be justified by added value brought with them
> Migration must be driven by basic principles• 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• Network consolidation and optimization and/or• New revenues driven from new services
All rights reserved © 2003, AlcatelITU-BDT Seminar on Network Evolution,Sofia, Bulgaria, 21- 24 Jan 2003— 4
Proposed Migration Approach
> Stepwise approach where each step is justified by new servicesor advantages brought from consolidation
> The proposed migration steps are generic• 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• Emphasis put on significant network elements needed for service
provision, on signaling relations between end-users and thenetwork and between network entities
• Emphasis put on fixed access networks though the approach is verysimilar for mobile networks evolution (see tomorrow’s presentation)
All rights reserved © 2003, AlcatelITU-BDT Seminar on Network Evolution,Sofia, Bulgaria, 21- 24 Jan 2003— 5
Access to the Internet and ConvergedInternet/Telephony services
POTS,ISDN
Local
VoiceDataSignaling
Internet
PacketNetwork
Dial-upModem
DSLAM
BAS
DSLModem
‘PINT’, ‘SPIRITS’
Parlay, JAIN, SIP
ApplicationServers
WWWServers
SS7
Local
Transit
TDM
STP
INAP
ISUP
Access Node
SCP
ISUP
Transit
NAS
ISDN/PRA
ApGW
Intelligent NetworkServices
Intelligent NetworkServices
Internet AccessDial-up and DSLInternet Access
Dial-up and DSL
Basic Telephony Services
Basic Telephony Services
Converged Voice and data ServicesConverged Voice and data Services
All rights reserved © 2003, AlcatelITU-BDT Seminar on Network Evolution,Sofia, Bulgaria, 21- 24 Jan 2003— 6
Access to the Internet and ConvergedInternet/Telephony services
> Basic telephony service and its associated supplementary services• TDM based transport• SS7 based signaling
> Intelligent Network Services• Calling Cards, Free phone,Voice virtual private networks,…
> Internet access• In dial-up mode or in broadband mode with DSL technology
> Converged Voice/data services• 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,...
All rights reserved © 2003, AlcatelITU-BDT Seminar on Network Evolution,Sofia, Bulgaria, 21- 24 Jan 2003— 7
Network consolidation: evolution towards multi-serviceaccess nodes and Internet traffic optimization
Internet
PacketNetwork
POTS,ISDN
SS7
ADSL-NT
Transit
Local
SCP
Voice
STP
DSLAM
Local
INAP
V5.2
Multi-serviceAccess Node
TDM
VoiceDataSignaling
ISUP
ISUP
Multi-serviceAccessNodes
V5.2 or proprietary
ATM, IP
NAS
BAS
ISUP (IMT)
Switch Capacity Enhancement
Switch Capacity Enhancement
Legacy and Broadband
Access
Legacy and Broadband
Access
BroadbandAccess
BroadbandAccess
Internet Dial-up traffic connectivity
in SS7
Internet Dial-up traffic connectivity
in SS7
All rights reserved © 2003, AlcatelITU-BDT Seminar on Network Evolution,Sofia, Bulgaria, 21- 24 Jan 2003— 8
Network consolidation and introduction ofnew multi-service access nodes> Switch consolidation
• Maximize number of line, minimize number of nodes• Upgrade of switch fabric and processors for higher capacity and
speed
> Access Consolidation• Introduce NGN-ready multi-service access nodes
– 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• Interconnection at local exchanges level (offload transit level)• Use of ISUP and Inter Machine Trunks (IMT) instead of ISDN/PRA
All rights reserved © 2003, AlcatelITU-BDT Seminar on Network Evolution,Sofia, Bulgaria, 21- 24 Jan 2003— 9
Voice over Packet for Trunking
PacketNetwork
SS7
Local orTransit
SCP
STP
Local orTransit
TDM
INAP
BICC
VoiceDataVoice/PacketSignaling
Internet
IntegratedGateway
ISUPTransit
ISUP
INAP
H.248
ISUP, BICC, SIP-T
Switch with MGCfunction
Offload of voice traffic to packet
network
Offload of voice traffic to packet
network
Voice Network Consolidation
Voice Network Consolidation
Quality of Service
at Aggregatelevel
Quality of Service
at Aggregatelevel
Transparencyof Packet Voice
use for end-user services
Transparencyof Packet Voice
use for end-user services
All rights reserved © 2003, AlcatelITU-BDT Seminar on Network Evolution,Sofia, Bulgaria, 21- 24 Jan 2003— 10
Voice over Packet for Trunking
> Gradually offload voice trunking traffic to the packet network
> Network consolidation by removal of an upper transit level oroptimization within a transit level• 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
> First mastering of voice over packet technology at aggregate level• Simpler Quality of Service issues
> Service transparency of Voice over Packet use for end-users
All rights reserved © 2003, AlcatelITU-BDT Seminar on Network Evolution,Sofia, Bulgaria, 21- 24 Jan 2003— 11
Voice over packet up to access level
PacketNetwork
SS7
Local
SCP
STP
AN
TDM
CentralisedAccess Gateway
DSLAM
H.248
INAPInternet
Switch with MGCfunction
ISUP
VoiceData
Voice/ PacketSignalling
Transit
ISUP
Access Gateways closer to end usersAccess Gateways
closer to end users
Control of accessgateways from Switch with MGC
function
Control of accessgateways from Switch with MGC
function
All rights reserved © 2003, AlcatelITU-BDT Seminar on Network Evolution,Sofia, Bulgaria, 21- 24 Jan 2003— 12
Voice over packet for access
> Extend use of packet transport to the access network for voiceservices• Introduction of Access Gateways
– Integrated within next generation multi-service access nodes or– Standalone centralized access gateways
• Access gateways are controlled by a switch with MGC function– Same services portfolio as on the PSTN/ISDN– Tighter integration of voice and packet services
> Improved network consolidation• 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
All rights reserved © 2003, AlcatelITU-BDT Seminar on Network Evolution,Sofia, Bulgaria, 21- 24 Jan 2003— 13
Multimedia Services
Internet
WWWServers
PacketNetwork
SS7
Local
SCP
STP
AN
Transit
TDM
Softswitch
DSLAM
BAS
ApplicationServers
Portal
SIPParlay JAIN
SIP
SIP, H.323
HTTP
VoiceData
Voice/PacketSignalling
INAP
ISUPISUP
ISUP
H.248
End-users shift tonew terminals
End-users shift tonew terminals
End-user to softswitch dialogue withnew protocols
End-user to softswitch dialogue withnew protocols
Next Generation Access node handle
resources for MM calls
Next Generation Access node handle
resources for MM calls
Openness to 3rdparty services
Openness to 3rdparty services Multimedia
Softswitch MultimediaSoftswitch
All rights reserved © 2003, AlcatelITU-BDT Seminar on Network Evolution,Sofia, Bulgaria, 21- 24 Jan 2003— 14
Multimedia Services
> End-users connected through next generation multi-serviceaccess nodes will adopt IP terminals for multimedia services• Better benefit of the high bandwidth, always-on and interactivity
associated with such next generation access networks
> New IP terminals will be controlled by Multimedia Softswitchesthrough a new type of NGN signaling• 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 thirdparty services through portals and open interface• Network operator becomes the intermediary broker between
application providers and their clients
All rights reserved © 2003, AlcatelITU-BDT Seminar on Network Evolution,Sofia, Bulgaria, 21- 24 Jan 2003— 15
Conclusions
> Services are key drivers for the evolution of telecom networks• 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• 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
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Thank You !Questions ?