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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
Seite 3E-Plus Mobilfunk GmbH & Co. KG 26.05.2010
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“
Seite 4E-Plus Mobilfunk GmbH & Co. KG 26.05.2010
• 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
Seite 5E-Plus Mobilfunk GmbH & Co. KG 26.05.2010
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
Seite 6E-Plus Mobilfunk GmbH & Co. KG 26.05.2010
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
Seite 7E-Plus Mobilfunk GmbH & Co. KG 26.05.2010
•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
Seite 8E-Plus Mobilfunk GmbH & Co. KG 26.05.2010
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
Seite 9E-Plus Mobilfunk GmbH & Co. KG 26.05.2010
•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
Seite 10E-Plus Mobilfunk GmbH & Co. KG 26.05.2010
Roaming voice scenario‘s
Seite 11E-Plus Mobilfunk GmbH & Co. KG 26.05.2010
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
Seite 12E-Plus Mobilfunk GmbH & Co. KG 26.05.2010
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
Seite 13E-Plus Mobilfunk GmbH & Co. KG 26.05.2010
•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
Seite 14E-Plus Mobilfunk GmbH & Co. KG 26.05.2010
Short term and standardised solution => CSFB
Future proofed solution => IMS
It‘s your choice!!!
Let‘s overcome the remaining obstacles together!!!
Seite 15E-Plus Mobilfunk GmbH & Co. KG 26.05.2010