Dietmar Kohenmergen- E-Plus Mobilfunk- Voice Over LTE

How can operators offer Legacy-IN services within LTE/SAE?

E-Plus Mobilfunk GmbH & Co. KG

26.05.2010

services within LTE/SAE?

NGCN summit conference 18.-19. May in Amsterdam

Introduction E-Plus Group

• E-Plus Mobilfunk GmbH founded 1993

• Subsidiary of KPN Netherlands

• Third largest MNO in Germany

• Service revenue 3,021 bn Euro in 2009

• 19M customers end of 2009

• Prepaid customers: >60%

• Multiple Brands:

Seite 2E-Plus Mobilfunk GmbH & Co. KG 26.05.2010

Motivation

„new“ service world„old“ service world

IN/OSAIMS


Goal: Each service world has to be reachable from each access world!!!

2G/3G LTE

Status of standardised solutions

• NGMN recommends CSFB

• „One Voice“ published an agreed IMS

based profile

• GSMA VoLTE adopts OneVoice initiative

„One Voice“


• over 40 supporting companies

• GSMA work completion by Q1 2011

Option 1: IMS-based with migration to „new“ service world

MAP IMS

ISC

P-CSCF

SCC-AS

HLR/HSS

IN/OSA

STPSMSC

Gx

Rx

MAP

INAP,CAP

„service migration“

S6a

ISC

IM-SSF

I-S-/CSCF

SGi

IMS-AS Msg.-AS


A/Iu -c

Sv

S1-c S1-u

S5S11

MME

P-GW

S-GW

LTE

PCRF

MSC-S

2G/3G

Gx

Gm

I2-IF:= Mw-IF + ICS extensions

I2

supports ICS

Option 2: IMS based via IM-SSF to „old“ service world

MAP IMS

ISC

P-CSCF

IMS-AS SCC-AS

HLR/HSS

IN/OSA

STPSMSC

Gx

Rx

MAP

INAP,CAP

INAP,CAP

S6a

ISC

IM-SSF

I-S-/CSCF

SGi

Msg.-AS


A/Iu -c

Sv

S1-c S1-u

S5S11

MME

P-GW

S-GW

LTE

PCRF

MSC-S

2G/3G

Gx

Gm

I2-IF:= Mw-IF + ICS extensions

I2

supports ICS

Pros and Cons of IMS solution

•No investment protection

•High complexity

•IN-Service impact

•Inbound roaming issues

•Costly


•Impact on MSC-S

•MTC delay

•Emergency calls

•SMS accounting

•Roaming charging model

•Future proofed

•parallel voice and data

•Outbound roaming

•Preferred 3GPP solution

Pros Cons

Option 3: CSFB

SGi

MAP IMS

ISC

P-CSCF

IM-SSF IMS-AS SCC-AS

HLR/HSS

IN/OSA

STPSMSC

Gx

Rx

MAP

INAP,CAP

S6a

ISC

I-S-/CSCF

Msg.-AS


A/Iu -c

SGs

S1-c S1-u

S5S11

MME

P-GW

S-GW

LTE

PCRF

MSC-S

2G/3G

Gx

Gm

SMS does not require fallback to 2G/3G!!!

Pros and Cons of CSFB solution

•Bad user experience

•Technical impacts

•Outbound Roaming

•Configuration efforts

•No support in CDMA

•Re-usability of IN-service


•Configuration efforts

•Ressource intensive

•Impact MVNO business

•Femtocell integration

•Unexpected dependencies

•Charging

•3GPP solution

•Inbound roaming

•Emergency calls

Pros Cons

•Investment protection

Roaming SMS scenario‘s


Roaming voice scenario‘s


Option 4: Alternative solution - VoLGA

SGi

MAP IMS

ISC

P-CSCF

IMS-AS SCC-AS

HLR/HSS

IN/OSA

STPSMSC

Gx

MAP

INAP,CAP

S6a

ISC

IM-SSF

I-S-/CSCF

Msg.-AS


A/Iu -c

Sv

S1-c S1-u

S5S11

MME

P-GW

S-GW

LTE

MSC-S

2G/3G

Gx

VANC

Z1

Rx

A/Iu

PCRF

VANC:= VoLGA access network controller

Pros and Cons of VoLGA solution

•No 3GPP solution•Re-usability of IN-service


•New UEs required

•VANC integration

•Outbound Voice Roaming

•Emergency calls VPLMN

•No impact on MSC-S

•Emergency calls HPLMN

•SMS outbound roaming

•Charging

Pros Cons

•Investment protection

•Inbound Roaming

Conclusion and recommendation

• General Issue:

• International Roaming aspects need clarification by

• Voice and SMS solution depends on strategy and focus of each MNO!!

Service and user experience => VoLGA


Short term and standardised solution => CSFB

Future proofed solution => IMS

It‘s your choice!!!

Let‘s overcome the remaining obstacles together!!!


Dietmar Kohenmergen- E-Plus Mobilfunk- Voice Over LTE

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