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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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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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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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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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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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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)


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


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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www.alcatel.com

Thank You !Questions ?

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