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NEXT GENERATION NETWORKSA view on migration paths from existingfixed and mobile networks
Souheil MARINEJean-Marie BLANCHARD
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All rights reserved 2002, AlcatelSminaire TIC/IMT-2000, Abidjan, 9-12 Septembre 2002 2
Why Next Generation Networks ?
> Convergence between the packet-based Internet andtelephony networks
Driven by technological evolution Demand for a universal service network
> 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 andservice layers are separated from each other and interact throughopen interfaces
> The target is well defined but how to get there ?
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All rights reserved 2002, AlcatelSminaire TIC/IMT-2000, Abidjan, 9-12 Septembre 2002 3
Migration Rationale
> Migration of current telephony networks (2 billion usersworldwide) 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 costlierwhen they get closer toend-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
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All rights reserved 2002, AlcatelSminaire TIC/IMT-2000, Abidjan, 9-12 Septembre 2002 4
Proposed Migration Approach
> Approach in 5 steps where each is justified by new services oradvantages brought from consolidation
> Application of each step to the specific case offixed andmobile (GSM and future 3G UMTS) networks
> 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
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All rights reserved 2002, AlcatelSminaire TIC/IMT-2000, Abidjan, 9-12 Septembre 2002 5
Step 1 Fixed: Access to the Internet and ConvergedInternet/Telephony services
POTS,ISDN
Local
Voice
Data
Signaling
Internet
Packet
Network
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
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All rights reserved 2002, AlcatelSminaire TIC/IMT-2000, Abidjan, 9-12 Septembre 2002 6
Step 1 Fixed: Access to the Internet and ConvergedInternet/Telephony services
> Basic telephony service and its associated supplementaryservices
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,...
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All rights reserved 2002, AlcatelSminaire TIC/IMT-2000, Abidjan, 9-12 Septembre 2002 7
Step 1 Mobile: Introduction of GPRS Packet Services
GPRS
Box
Mobile Radio
AbisBTS
BTS
BTS
Ater
BSC
Mobile Core Circuit SwitchingMSC/VLR
HLR
PSTN
GsA
Mobile Core Packet Switching
Gb Internet /Intranet
DNS /
DHCP
Charging
Gateway WAPGateway
Gn Gi
IP
backbone
GGSN
SGSN
BorderGateway
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Step 1 Mobile: Introduction of GPRS Packet Services
> General Packet Radio Service (GPRS) introduced as a solutionfor offering an always-on access mode to data services formobiles
Optimized use of the scarce radio resource Share the bandwidth for data services between users of a given radio
coverage zone (cell)
Radio resources are not monopolized during idle periods
> No modification of the existing radio and core infrastructure forvoice services
GPRS adaptation equipment added to existing radio infrastructure
GPRS specific core infrastructure re-usable in further evolutionsteps
> GPRS service platform
Offers access to Internet/Intranet data networks and to serviceportals (first step towards future UMTS services)
Optimize provision of 2G data services like Short Messages (SMS)
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Step2 Fixed: Network consolidation and introduction ofnew multi-service access nodes
Internet
PacketNetwork
POTS,ISDN
SS7
ADSL-NT
Transit
Local
SCP
Voice
STP
DSLAM
Local
INAP
V5.2
Access Node
TDM
Voice
Data
Signaling
ISUP
ISUP
Multi-serviceAccessNodes
V5.2V5.2 or
proprietary
ATM, IP
NAS
BAS
ISUP (IMT)
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Step 2 Fixed: 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 forhigher capacity andspeed
> Access Consolidation
Add NGN-ready multi-service access nodes
End-user 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 offerwithout 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
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Step 2 Mobile: Introduction of UMTS Radio AccessNetworks
QoS-enabled IP backbone
Optical Core
UMTS
RAN
Internet
HLR
PSTNSGSN
GGSN
GSM
RAN
MSC
SCP
Edge
Router
Edge
Router
Core
Router
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Step 2 Mobile: Introduction of UMTS Radio AccessNetworks> Initial introduction of 3G UMTS radio access network (UTRAN)
as coverage islands
Rest of the network coverage kept with legacy GSM 2G/2.5G radio
> Combined 2G/3G HLR, MSC, SGSN and GGSN networkequipment support both types of access (Alcatels approach)
Smooth upgrade of early 2G equipment
> Backbone data network introduced with QoS features Edge routerconcentrates ATM streams coming from UTRAN
Front-end for both packet and circuit streams
Evolves into an access gateway in future evolution steps
Core routerswitches IP traffic with MPLS/DiffServ support
> New service capabilities with location based service support
Enhanced intelligent network interfaces for mobiles towards SCP
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Step 3 Fixed: Voice over Packet for Trunking
Packet
Network
SS7
Local orTransit
SCP
STP
Local orTransit
TDM
INAP
BICC
Voice
Data
Voice/Packet
Signaling
Internet
IntegratedGateway
ISUPTransit
ISUP
INAP
H.248
ISUP, BICC, SIP-T
Switch with MGC
function orSoftswitch
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Step 3 Fixed: 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 theLEX/TEX
Alternative solution based on external trunking gateways controlled
by a Switch with Media Gateway Control (MGC) function or aSoftswitch
Use of SS7 based BICC signaling for co-existence with PSTN/ISDNservices
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
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Step 3 Mobile: Voice service over Packets (Core andAccess)
QoS-enabled IP backbone
Optical Core
UMTS
RAN
Internet
HLR
PSTN
SGSN
GSM
RAN
MSC
server
SCP
A-MGW
T-MGW
GMSC
server
BICC
H.248 H.248
AMR/AAL2Conne
ctivity
Layer
Con
trol
Lay
er
GGSN
Edge
RouterEdge
Router
Core
Router
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Step 3 Mobile: Voice service over Packets (Core andAccess)
> Generalization of UTRAN access
Voice coming in packet mode (ATM/AAL2) from the accessnetwork
> Leverage on the QoS-enabled IP backbone to support voiceservices in NGN way
Keep voice in original packet mode for mobile-mobile calls
Avoid unnecessary and quality decreasing encoding/decoding
Evolution of 2G/3G integrated MSCs into MSC servers (Alcatelsapproach)
Use of the H.248 open interface to control Media gateways
> Media gateways forAccess and Trunking functionality
Based on the same platform as the Edge Router
Mediation device for voice applications over ATM/AAL2
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Step 4 Fixed: Voice over packet up to access level
PacketNetwork
SS7
Local
SCP
STP
ANAccess Node
TDM
CentralizedAccess Gateway
DSLAM
H.248
INAPInternet
Switch with MGCfunction orSoftswitch
ISUP
Voice
Data
Voice/ Packet
Signaling
Transit
ISUP
Multi-serviceAccess Node
with IntegratedAccess Gateway
Voice/PacketGateway
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Step 4 Fixed: Voice over packet up to access level
> Extend use of packet transport to the access network for voiceservices
Introduction ofAccess Gateways Integrated within next generation multi-service access nodes or
Standalone centralized access gateways
Access gateways are controlled by a switch with MGC function or
a softswitch Same services portfolio as on the PSTN/ISDN
Tighter integration of voice and packet services
> Improved network consolidation
control of the voice traffic from fewerMGC Switches orSoftswitches
Voice traffic gradually moved from the control of old generation
switching equipment to the control of upgraded MGC switches orSoftswitches
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Step 5 Fixed: Multimedia Services
Internet
WWWServers
PacketNetwork
SS7
Local
SCP
STP
AN
Transit
TDM
Softswitch
DSLAM
BAS
ApplicationServers
Portal
SIPParlayJAIN
SIP
SIP, H.323
HTTP
Voice
DataVoice/Packet
Signaling
INAP
ISUP
ISUP
ISUP
H.248
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Step 5 Fixed: 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 interactivityassociated with such next generation access networks
> New IP terminals will be controlled by Multimedia Softswitchesthrough a new type of NGN signaling
SIP orH.323
Access network will focus on resource provision under thesoftswitch 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 brokerbetweenapplication providers and their clients
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Step 5 Mobile: Multimedia Services
QoS-enabled IP backbone
Optical Core
UMTS
RANInternet
PSTN
SIP Terminals
Transport & connectivity layer
Session layer
Service Co-ordination layer
Application layer
Portal
3rd partyApplication
Integrated
Management
HLR
3rd partyApplication3rd party
Application
GGSN
HSS
Mediaserver
A-MGW
V/G-MSCServer
SGSN
T-MGW
Multimedia
Softswitch
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Step 5 Mobile: Multimedia Services
> IMS is the operator solution to differentiate from commodity-priced best-effort data services
Offering end-to-end Quality of service
Network operator as the brokerofadded-value services Services can be offered by 3rd party service providers
New business model unlocking new revenue sources
> Multimedia Softswitch providing new services Re-use of the currently deployed packet switched IP backbone
and network equipment (SGSN and GGSN)
New NGN signaling with new type of end-user terminals
SIP protocol with proper extensions to ensure end-to-end QoS perservice invocation
Open interfaces towards 3rd party service provider
Inter-working with voice services through interface with MSCServer
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Conclusions
> Migration to NGN is an evolution of existing networks
> Driven by
Enhanced capabilities ofBroadband access
Demand fornew services from customers
> Speed of migration depends on
Widespread acceptance and appropriation of new services
But also on the maturity of the newly introduced technologies
> There is no universal migration scenario
Each migration depends on specific operator conditions, strategy,andavailable budget
Migration process must be self-financed by revenue from newservices and/orcost reductions from network optimization
Interoperability with the installed base is a key condition forsuccess
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Thank You !Questions ?