3gpp2 femto architecture summary (january –july 2008)
TRANSCRIPT
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3GPP2 Femto Architecture Summary
(January – July 2008)
09/26/2008
James Ni
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Overview
� Summarizes all Femto Architectures proposed to 3GPP2
• January 2008 Hollywood meeting
• February 2008 Xiamen meeting
• April 2008 Montreal meeting
• May 2008 Osaka meeting
• June 2008 Cancun meeting
• July 2008 Orlando meeting
� 3GPP2 targeted date for femto architecture baseline document
• Q4 2008
� Two major camps
• Pro SIP/IMS camp
• Pro legacy protocol tunneling camp
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January 08 Hollywood meeting
summary
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January 08 Hollywood meeting summary
� Formally started working on Femto architecture
� Proposed femto architecture baseline
� Call for member contributions
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January 08 Hollywood meeting summary
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February 08 Xiamen meeting
summary
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February 08 Xiamen meeting summary
� Received a number of architecture proposals from members
� Two focuses:
• 1x voice accessing architecture
• Data accessing architecture
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Proposed Architectures (Qualcomm)
� Qualcomm proposed 5 different architectures
• 2 architectures for supporting 1x circuit-switched services
– SIP/IMS based architecture
– A1p/A2p/MSCe based architecture
• 3 architectures for supporting HRPD and 1x packet-switched services
– Split PDSN architecture
– PDSN in macro architecture
– PDSN in femto architecture
� Qualcomm did not show any preference to any one of the proposed
architectures
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Proposed Architectures (Qualcomm 1)
� SIP/IMS based architecture
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Proposed Architectures (Qualcomm 1)
� ANSI-41 based Handoff
• Via SIP / ANSi-41 Interworking AS and legacy MSC
� A21 Handoff
• Via VCC (Voice Call Continuity) AS
Femto-Macro Handoff
Security gateway to macro network
• IPsec tunnels with femto cell
Femto Security Gateway Function
SIP/ANSI-41 Interworking ASWhere Call is Anchored
Provided by SIP/ANSI-41 Interworking AS1x Supplementary Services
� SIP: For 1x call and service signaling with IMS Core
� RTP: For voice and user traffic transport
Interface to Macro Network
Macro Core Network Support
Femto Cell Components
� IMS / SIP servers deployment
� SIP/ANSI-41 Interworking Application Server (AS)
* Convert between SIP and ANSI-41
• Interfaces with 1x HLR, MSC
* MSC/VLR functions
• Authentication with 1x HLR
• Location Management
• Call control
• Handoff management
• Supplementary services
BTS, BSC, SIP Client
� SIP/IMS based architecture (details)
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Proposed Architectures (Qualcomm 2)
� A1p/A2p/MSCe based architecture
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Proposed Architectures (Qualcomm 2)
� A1p/A2p/MSCe based architecture (details)
Inter-MSC handoff
� MSCe – Legacy MSC
Femto-Macro Handoff
� Security gateway to macro network
• IPsec tunnel end-point for femto cell
Femto Security Gateway
Functions
MSCeWhere Call is Anchored
Provided by MSCe1x Supplementary Services
A1p, A2p per 3GPP2 IOS Standards
� Protocols for transporting A1 / A2 signaling and traffic over IP
Interface to Macro Network
Macro Core Network Support
Femto Cell Components
MSCe (MSC emulator) deployed
� IP-based MSC
� Support A1p, A2p and interfaces to PSTN, HLR, legacy MSC
BTS, BSC
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Proposed Architectures (Qualcomm 3)
� Split PDSN based architecture for EV-DO
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� Split PDSN based architecture for EV-DO (details)
� Security gateway to macro network
• IPsec tunnel end-point for femto cell
Femto Security Gateway Functions
A12, A13, A16, A21Optional Interfaces to Macro Network
�Partial PDSN Functions
• Foreign Agent (FA)
•Accounting --UDR Generation
•Authentication (RADIUS)
•QoS policy enforcement
PDSN Core
PDSN in Femto CellPPP Termination Point
� No external A10/A11 establishment, internal to femto cell
� New PPP establishment
� PPP CHAP authentication via Femto Gateway and AAA
� Binding update of new care of address w/ HA for mobile IP
Handoff Impact
RADIUS, MIP via Femto GatewayMandatory Interfaces to Macro Network
Macro Core Network Support
Femto Cell Components
No femto-specific
RN, RNC, PCF, some PDSN Functions
Proposed Architectures (Qualcomm 3)
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Proposed Architectures (Qualcomm 4)
� PDSN in Macro Network based architecture for EV-DO
AT
1x BSC
IWF
A21
Macro 1x Domain
EV-DO
Femtocell
(RN-RNC-
PCF)
Femto
Security
Gateway
AAA
Untrusted
InternetCable
/ DSL
IPsec
Tunnel(s)
Macro EV-DO Network
PDSNInternet /
Intranet
A12
IP
Macro Network Domain
A13, A16
IP
Femtocell Domain
RNC
IP
NetworkA11
A10
* Mandatory: A10/A11
* Enhanced: A12, A13,
A16, A21
* IPsec tunnel support
* Security gateway –
IPsec tunnel support
PPP
termination
point
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� PDSN in Macro Network based architecture for EV-DO (details)
Proposed Architectures (Qualcomm 4)
A12, A13, A16, A21Optional Interfaces to Macro
Network for Enhanced Capabilities
� Security gateway (firewall) to macro network
• IPsec tunnel end-point for femto cell
Femto Security Gateway Functions
Macro PDSNPPP Termination Point
� New A10/A11 establishment
� No PPP re-establishment
•If target RNC re-selects same PDSN upon handoff
Handoff Impact
A10 / A11Mandatory Interfaces to Macro
Network
Macro Core Network Support
Femto Cell Components
Macro PDSN used for femto cells
RN, RNC, PCF
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� PDSN in Femto Cell based architecture for EV DO
Proposed Architectures (Qualcomm 5)
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� PDSN in Femto Cell based architecture for EV DO (details)
Proposed Architectures (Qualcomm 5)
A12, A13, A16, A21Optional Interfaces to Macro
Network
� Security gateway (firewall) to macro network
• IPsec tunnel end-point for femto cell
Femto Security Gateway Functions
PDSN in Femto CellPPP Termination Point
� No external A10/A11 establishment, internal to femto cell
� New PPP establishment
� PPP CHAP authentication between femto PDSN and AAA
� Binding update of new care of address w/ HA for mobile IP
Handoff Impact
RADIUS, MIPMandatory Interfaces to Macro
Network
Macro Core Network Support
Femto Cell Components
No femto-specific
RN, RNC, PCF, PDSN, FA
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� Airvana proposed two architectures
• Legacy Technology-based Architecture
• SIP/IMS-based Architecture
� Airvana’s preference is the SIP/IMS based architecture
� However, they seemed also ready for the legacy technology base one
Proposed Architectures (Airvana)
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� Legacy Technology-based Architecture
Proposed Architectures (Airvana 1)
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� SIP/IMS based architecture
Proposed Architectures (Airvana 2)
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� CSRV Functions
Proposed Architectures (Airvana)
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� IMS and legacy network interworking
Proposed Architectures (Airvana)
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� ALU proposed two architecture
• HRPD Femto Architecture
• 1x Femto Architecture
� ALU did not show any preference to any one of the two architectures
Proposed Architectures (ALU)
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� HRPD Femto Architecture
� A typical legacy protocol tunneling based architecture
Proposed Architectures (ALU 1)
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Proposed Architectures (ALU 2)
� 1x Femto Architecture
� This is an IMS-like Architecture
• MFIF: MAP-Femto Interworking Function
• TAS: Telephony Application Server
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� Starent proposed only one architecture
• Basically a legacy protocol tunneling solution
• Starent’s IMS application still need a SIP AS
Proposed Architectures (Starent)
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� This is a typical legacy protocol tunneling architecture
Proposed Architectures (Starent)
Femto
Access
Point
Home
GW
Femto Management System
FAP-MS FGW-MS
Fa
Fixed
Broadband
Internconnect
Fd
Fm Fg
CS core
PS core
Subscriber Databases
Fb-cs-1,2
Fb-ps
Fr
HPLMN Core Network
Common IMSFb-ims
Femto
Access
Point
Mobile
Station
Fd
Ff
Fw
PCRF
Home
GW
FL
FL
Fa
Fe
RAN
Mobile
Station
Fp
SeGW
Femto GW
SeGW
CS����SIP IWF
Media Gateway
CS/PS Proxy
PDSN/FA
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Proposed Architectures (Starent)
FGW �������� Management System
FAP �������� Management System
FAP �������� Home Gateway
FGW �������� Subscriber Database
FGW �������� IMS Core
FGW �������� PS Core
FGW �������� eCS Core
FGW �������� CS Core
FAP �������� FGW
Description
� HTTP (not specified in 3GPP2)
� TR-069 (not specified in 3GPP2)
� UPnP (not in 3GPP2 scope)
� A12 for HRPD (AN-AAA)
� RADIUS (AAA)
� Gm/Mw
� MIP, PMIP, Simple IP
� A1p, A2p (IOS 5.0)
� A1, A2 over SS7 (TDM)
� IOS (Ax) over IP
3GPP2 Interface
Ut
Fm
Fl
Fr
Fb-ims
Fb-ps
Fb-cs-2
Fb-cs-1
Fa
Femto Forum Reference
Point
traffic that operator allows to be directed into the
broadband network for routing
FGW �������� Fixed Broadband NetworkFe
FAP �������� FAP
FGW �������� RAN
FGW �������� PCRF
Mobile Station �������� FAP
Description
� A3/A7 Inter-FAP SHO (e.g., multiple FAPs in home)
� IOS (Ax)
� Ty
� CDMA2000 1x CDMA2000 HRPD
3GPP2 Interface Alignment
Ff
For Further Study
Fw
Fp
Fd
Starent Proposed Reference
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� Starent Architecture in pre-IMS network
Proposed Architectures (Starent)
A1
A2
A1p/A2p
1x
A1/2 MSC/VLR
Home NetworkHome Network
BTSBTS
BSCBSC
PCFPCF
FemtoFemto
Security GWSecurity GW
PDSN FAPDSN FA
AxpAxp/Ax Conversion/Ax Conversion
IOS ProxyIOS Proxy
IOS/SIP GatewayIOS/SIP Gateway
RTP RelayRTP Relay
Femto GatewayFemto Gateway
A1p/A2p
A10/A11
BSC
1x
HRPD
AN A10/11
A12/A13/A16/A21
IPSec SA
PDSN
FAMIP
MIP
HLR/
AuC/
HSS
IS-41
IS-41
InternetHome
Agent
AAA
HRPD
MSCe
Data
Services
Core IP
Network
AN-
AAA
A12
A12A13/A16
A21
Simple IP
1x IOS
MSC
IS-41
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� Starent Architecture in IMS network
Proposed Architectures (Starent)
1x
A1/2 MSC/VLR
Home NetworkHome Network
BTSBTS
BSCBSC
PCFPCF
FemtoFemto
Security GWSecurity GW
PDSN FAPDSN FA
IOS ProxyIOS Proxy
IOS/SIPIOS/SIP GatewayGateway
RTP RelayRTP Relay
Femto GatewayFemto Gateway
A1p/A2p
A10/A11
BSC
1x
HRPD
AN A10/11
A12/A13/A16/A21
IPSec SA
PDSN
FAMIP
MIP
HLR/
AuC/
HSS
IS-41
Cx
InternetHome
Agent
AAA
HRPD
A1p/SIP
Data
Services
Core IP
Network
AN-
AAA
A12
A12A13/A16
A21
A2p/RTP
1x IOS
CSCF
Convergence
Server
CSRV
VLR
ISC
IS-41
VCCF
WIN
Call
Continuity
Server
ISC
MgMGC
MGW
Gm/SIP
MbVoIP/RevA
VoIP
Rev-A
Simple IP/Gm/SIP
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� Huawei proposed 3 architectures
• 1x IOS based FemtoCell Architecture
• IMS based FemtoCell Architecture
• EVDO FemtoCell Architecture
� Huawei did not show any preference
Proposed Architectures (Huawei)
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� 1x IOS based FemtoCell Architecture
� A typical legacy protocol tunneling architecture
Proposed Architectures (Huawei 1)
MS FAP FGW
MSC/ MSCe
MGW
HLR
PDSN
CS
PSHAAA
CS
PS
A1/ A1p
A 2 p
A10/ A11
FAP
� Contains BTS/BSC/PCF function
� Provides A1p/A2p/A10/A11 interface to the FGW
� Support IPSec
FGW
� Proxy of A1p/A2p/A10/A11
� Provide standard A1/A1p/A2/A2p Interface to the MSC
� Provide standard A10/A11 interface to the PDSN
� Support IPSec
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� IMS based FemtoCell Architecture
Proposed Architectures (Huawei 2)
MS FAP
FGW
( SI PCl i ent )
MSC/ MSCe
HLR
PDSN
HAAA
CS
PS
A10/ A11
I MS AS
P/ S- CSCF MGCF
MGW MS
HSS
FAP
� Contains BTS/BSC/PCF function
� Provides A1p/A2p/A10/A11 interface to the FGW
� Support IPSec
FGW
� Proxy of A1p/A2p/A10/A11
� Support SIP client function in order to convert A1p
signaling to SIP signaling
� RTP transport of user traffic
� Provide standard A10/A11 interface to the PDSN
� Support IPSec
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� EVDO FemtoCell Architecture
Proposed Architectures (Huawei 3)
MS/ AT FAP FGW
MSC/ MSCe HL R
PDSN HAAAI P S e c
A1 / A1p
A10/ A11
AN- AAA
HRPD AN
1x BSS
A 1 2
A13 / A16
A1/ A2
A 2 1
FAP
� Contains BTS/BSC/PCF function
� Provides A10/A11/A13/A16/A1p/A21 interface to the
FGW
� Support IPSec
FGW
� Proxy of A10/A11/A13/A16/A1p/A21
� Provide standard A10/A11 interface to the PDSN
� Provide standard A13/A16 interface to the HRPD AN
� Provide standard A1p/A21 interface to 1x system
� Support IPSec
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� ZTE proposed 4 architectures
• Legacy Based Tunneled A1/A2 Architecture
• Legacy Based Tunneled Abits Architecture
• Legacy Based Tunneled SIP Server Architecture
• SIP/IMS based architecture
� ZTE did not show any preference
Proposed Architectures (ZTE)
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� Legacy Based Tunneled A1/A2 Architecture
Proposed Architectures (ZTE 1)
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� Legacy Based Tunneled Abis Architecture
Proposed Architectures (ZTE 2)
1x AiF
HRPD AiF
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� Legacy-Based SIP Server Architecture
Proposed Architectures (ZTE 3)
Mobile IP
Home
Agent
cdma 1x
Mobile
Station
Legacy MS Domain
Support
Other Access Networks
Access Gateway
FA / Attendant
eBS
SRNC
HRPD-AN PDSN
Non-3GPP2
Trusted AN
Non-3GPP2
Un-Trusted AN
HRPD
Access
Terminal
ePDIF
PSTN
IPNetwork
MAPTIA/EIA-41
IPServices
UMB-AN
Femto CellFemto Network
GatewayF1
Aquater
1x AiF
HRPD AiF
PDIF
Call Manager
Legacy Core Network
HLR MSC SCP
F2 F3
A
F4
Media
Gateway
Media
Gateway
Control
Function
IMS Core Network
Call Session
Control
Function
SIP Gateway
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� SIP/IMS Based Architecture
Proposed Architectures (ZTE 4)
1x AiF
HRPD AiF
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� Nortel proposed one architecture
• An IMS based architecture
Proposed Architectures (NT)
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� Nortel proposed IMS based architecture
• TAS: Telephony application server
Proposed Architectures (NT)
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Pro IMS v.s. Pro Legacy Protocol Tunneling
Pro IMS CampPro Legacy Protocol
Tunneling Camp
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May 08 Osaka meeting summary
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May 08 Osaka meeting summary
� Consolidation started
� Nortel, Arivana and ALU proposed 1xRTT voice femto network architecture
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May 08 Osaka meeting summary
� Qualcomm presented two 1xRTT voice femto network architectures (1)
• 1x voice femto architecture using A1/A1p and A2/A2p
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May 08 Osaka meeting summary
� Qualcomm presented two 1xRTT voice femto network architecture (2)
• 1x voice femto architecture using IMS
• This one conforms with the one proposed by Nortel, Airvana and ALU
![Page 48: 3GPP2 Femto Architecture Summary (January –July 2008)](https://reader031.vdocuments.mx/reader031/viewer/2022021209/62063ffb8c2f7b173005dc0d/html5/thumbnails/48.jpg)
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May 08 Osaka meeting summary
� Qualcomm also presented a HRPD/1x packet femto network architecture
• On top of this architecture, a MIP interface between FAN to HA is proposed
Femto
Gateway MS/
AT
Femto
Cell
PDSN PCRF
Macro RNC/
PCF
A10
A11
A13/A16 (HRPD Only)
HRPD or
1x Packet
Macro
Cell
A10
A11HA
AAA
A12
A12
AN-AAA
MIP
Femto Access Network (FAN)
![Page 49: 3GPP2 Femto Architecture Summary (January –July 2008)](https://reader031.vdocuments.mx/reader031/viewer/2022021209/62063ffb8c2f7b173005dc0d/html5/thumbnails/49.jpg)
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June 08 Cancun meeting summary
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June 08 Cancun meeting summary
� Qualcomm, Huawei, Nortel and ALU re-confirmed the HRPD/1x Packet femto
architecture
• MIP interface between FAN to HA was not adopted
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June 08 Cancun meeting summary
� Qualcomm initiated discussion on Femto Authentication Options
• different types of credentials for femto systems
– Femto (Device) Credentials
– User (or) AT credentials
• two femto authentication options/approaches
– Shared key Authentication
– Certificate-based Authentication
� Qualcomm also initiated discussion on Femto Provisioning and Registration
• IPComm, LGE, VIA Telecom contribution: Provisioning parameters
• ALU contribution: Femto Management system
• Femto management framework was proposed
![Page 52: 3GPP2 Femto Architecture Summary (January –July 2008)](https://reader031.vdocuments.mx/reader031/viewer/2022021209/62063ffb8c2f7b173005dc0d/html5/thumbnails/52.jpg)
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July 08 Orlando meeting summary
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July 08 Orlando meeting summary
� Started drafting the following femto specifications
• X.P0059-000 Femto Overview and Architecture
• X.P0059-100 femto Network Specification
� Approved femto 1xRTT Architecture
Femto
GatewayMS
HLR/
AuC
1x
MSC
MFIF TAS
MGCF/
MGW
SMSC
SIP
(SIP)
Femto Access
Point
SIP
UA
Legend:
TAS – Telephony Application Server
SMSC – Short Message Service Center
MFIF – MAP-Femto Interworking Function
MAP
SIP
Fx3
(RTP)
Fx2
Fx1
AAA
AAA
IMS
SIP
MAP
1x Macro
BSCA2
A11x
Macro
Cell
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July 08 Orlando meeting summary
� Approved HRPD/ 1x Packet Data Femto Architecture
Ty
Ty
IP
FGW
AAA
(Axx)
Femto-AAA
MS/AT1xRTT/
HRPD
A11
Internet
MIP
(P)MIP
AAA
(A12)
AN-AAA
AAA
HA/LMA
PDSN
For A12 Device
Authentication
For Femto
Device
Authentication
AAA
For PDS
Authentication
HRPD
AN
FAP
FA/
MAG
A13
A16
-19
SeGW
IP
A10
BS/AN
PCRF
PDST
![Page 55: 3GPP2 Femto Architecture Summary (January –July 2008)](https://reader031.vdocuments.mx/reader031/viewer/2022021209/62063ffb8c2f7b173005dc0d/html5/thumbnails/55.jpg)
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July 08 Orlando meeting summary
� Qualcomm added PDE, MPC and PSAP elements into the 1x voice femto
architecture reference model
PDE – Position Determining Entity
MPC – Mobile Positioning Center
PSAP – Public Safety Answering Point
![Page 56: 3GPP2 Femto Architecture Summary (January –July 2008)](https://reader031.vdocuments.mx/reader031/viewer/2022021209/62063ffb8c2f7b173005dc0d/html5/thumbnails/56.jpg)
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July 08 Orlando meeting summary
� Qualcomm added IMS core into the HRPD/1x Packet femto architecture
reference model
![Page 57: 3GPP2 Femto Architecture Summary (January –July 2008)](https://reader031.vdocuments.mx/reader031/viewer/2022021209/62063ffb8c2f7b173005dc0d/html5/thumbnails/57.jpg)
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Femto
GatewayMS
HLR/
AuC
1x
MSC\
MSCe
MFIF TAS
MGCF/
MGW
SMSC
SIP
(SIP)
Femto Access
Point
SIP
UA
Legend:
TAS – Telephony Application Server
SMSC – Short Message Service Center
MFIF – MAP-Femto Interworking Function
MAP
SIP
Fx3
(RTP)
Fx2
Fx1
AAA
AAA
IMS
SIP
MAP
1x Macro
BSCA2
A11x
Macro
Cell A1/A1p
A2/A2p
July 08 Orlando meeting summary
� Sumsung suggested to add A1/A1p and A2/A2p interfaces between FGW and
MSC/MSCe in 1x voice femto architecture reference model
![Page 58: 3GPP2 Femto Architecture Summary (January –July 2008)](https://reader031.vdocuments.mx/reader031/viewer/2022021209/62063ffb8c2f7b173005dc0d/html5/thumbnails/58.jpg)
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July 08 Orlando meeting summary
� Sumsung suggested to add MSC/MSCe and PCF elements and
corresponding interface in HRPD/1x packet femto architecture reference
model
Ty
Ty
IP
FGW
AAA
(Axx)
Femto-AAA
MS/AT1xRTT/
HRPD
A11
Internet
MIP
(P)MIP
AAA
(A12)
AN-AAA
AAA
HA/LMA
PDSN
For A12 Device
Authentication
For Femto
Device
Authentication
AAA
For PDS
Authentication
HRPD
AN
FAP
FA/
MAG
A13
A16
-19
SeGW
IP
A10
BS/AN
PCRF
PDST
MSC/
MSCe
A1/A1p
PCFA9A8
A11
A10
![Page 59: 3GPP2 Femto Architecture Summary (January –July 2008)](https://reader031.vdocuments.mx/reader031/viewer/2022021209/62063ffb8c2f7b173005dc0d/html5/thumbnails/59.jpg)
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July 08 orlando meeting summary
� Airvana started proposing the second phase of recommendations based on
the approved femto architecture reference models on the following aspects:
• Femto Gateway Functions (Security, Authentication)
• Proposed PDSN based Femto-FNG tunneling model
• Proposed high level call flow for tunnel establishment and MS/AT registration,
1x voice service access, HRPD service access, on going FAP management
etc.
• Other misc. recommendations