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25 years of GSM

840 Networks in 192 countries

5,800,000,000,000call minutes annuallyTomi Ahonen Consulting

Economies of scale4 billion connections

Interoperability - 2G & 3G

How to make an ecosystem

GSM Association 2010

Diverse handsets

Common Network interface

Roaming

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The Voice challenge for LTE

LTE is an all-IP mobile network

No support for traditional CS domain voice

New Voice and SMS solutions required

CSFB, VoLGA, One Voice

The risk industry fragmentation

Poor customer ex erience

GSM Association 2010

No common implementationEconomies of scale are lost

The Reality the industry knows where it is going

OneVoice adoption as GSMA Voice over LTE (VoLTE)

Massive backing from operator and vendor community.

Migratory solutions filling the gap between LTE launch and IMS deploymentfor some operators.

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Migratory Solutions

Migratory solutions fill the gap between existing CS voice and the TargetSolution.

Short window of opportunity for deployment

Not required by all operators (some will move directly to the TargetSolution).

GSM Association 2010

,

Handset impact => need to support handsets with network functionality evenonce Target Solution is deployed.

More than one Migratory solution defined

CS Fallback (CSFB) in 3GPP, VoLGA defined by VoLGA Forum

Industry fragmentation leads to non-optimal economies of scale andbreakage of roaming

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Target solution - GSMA VoLTE

GSMA VoLTE Task Force

Single target solution IMS-based

Shorten the window for Migratory solutions

For as many operators as possible, try and avoid the need for anymigratory solution at all

VoLTE Task Force and One Voice collaboration

GSM Association 2010

VoLTE adopted One Voice Profile of IMS SIP, 8th

January 2010GSMA VoLTE initiative announced 15th February 2010

One Voice closed, all future work through VoLTE initiative.

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CS VoiceWhat GSMA VoLTE will deliver

GSM Association 2010

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IMSUNI

Customer Interface

GSM Association 2010

Common UNI (User Network Interface) needed

Common implementation results in Roaming capability maintained

Global scale and global ecosystem Lower per unit cost for vendors as a result greater amortisation

of R&D

VoLTE protocol profile enables these benefits

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Interconnect

NNI

IMSUNI IMSUNI

Interconnection

GSM Association 2010

Interconnect Network-Network Interface (i/c NNI) creates end-to-end call connectivity

Common functionality required

Common implementation required Need for expensive interworking functionality is removed

Work initiated in GSMA IREG Packet Working Group

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Completing the work

GSMA Working Groups with expertise in

inter-network charging

interoperability with existing systems

handover from IMS to CS domain

Interconnectivity models

GSM Association 2010

o w wor w t n ustry o es or overa so ut on

3GPP

NGMN Alliance

IMTC

GCF

PTCRB

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Industry Support

GSM Association 2010

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Conclusions

Continuing high quality, fully interoperable and globallyavailable voice services is fundamental to operators

Require a single technology, common interfaces and openstandards

GSM Association 2010

VoLTE will develop the necessary specifications

to put this in place

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Get Involved

If you are interested to learn more about GSMA VoLTE orwould like to support the work

volte@gsm.org

GSM Association 2010

www.gsmworld.com/volte