1. 3GPP2 Femto Cell Workshop
<IMS Services for Femtocell>
S00-FEMTO
3GPP2 Femto Cell Workshop
TITLE: IMS Services for Femtocell
SOURCE: Dennis Ong, Alcatel-Lucent
Donna Sand Alcatel-Lucent
CONTACT:
ABSTRACT: This contribution defines the services that interface between the femtocell and the IMS core network with the goal of having open services interfaces to support multi-vendor femtocell
RECOMMENDATION: <Discuss and Adopt / FYI >
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This document has been prepared by Alcatel-Lucent to assist the development of specifications by 3GPP2. It is proposed to the Committee as a basis for discussion and is not to be construed as a binding proposal on Alcatel-Lucent. Alcatel-Lucent specifically reserves the right to amend or modify the material contained herein and to any intellectual property of Alcatel-Lucent other than provided in the copyright statement above.

2. Objectives
To define the services architecture between the femtocell and the IMS Core Network (IMS CN) that will enable a multi-vendor femto environment.
The services are:
Phase 1
1x voice Handoffs – Two options
SIP/MAP (ANSI-41): Support Macro <-> Femto, Femto <-> Femto
A21/Voice Call Continuity(VCC): Only support Femto -> Macro
Services Interworking
Femto emulates SIP simple endpoint to IMS CN
Proposed Interworking Call Flow example shown in following slides (call hold without announcement)
Short Message Service Interworking
Support using both TSG-X X.P0048 SIP MESSAGE and MAP SMDPP
Proposed Interworking Call Flow described in following slides
Phase 2 -- VCC for support of domain transfer (handoff) between HRPD in the Femto to 1X in the macro network environment
Support using TSG-X X.P0042 standard

3. Femtocell ArchitectureHA
AAA
Femto
OA&M
BSR Femto
Router/
Modem
Private
IP Network
Femto
Network
Gateway
DSL or
Cable
Network
IMS Core
Femto Network
Macro Network
HRPD
RNC
PSTN
3G-1X
MSC
HLR
SMS- GW

4. Short Message Service (SMS) Interworking Mobile Originated SMS
UE1
Femto
IMS CN
HSS
SMS-GW
Mobile Originated Short Message Service (MO SMS) from UE1
(M1)
Data Burst Message (DBM)
(M2)
SIP MESSAGE
(M3)
SIP MESSAGE
(M4)
SIP 202 ACCEPTED
(M5)
SIP 202 ACCEPTED
(M6)
SIP MESSAGE (Delivery Ack)
(M7)
SIP MESSAGE (Delivery Ack)
(M8)
Data Burst Message (DBM) (Delivery Ack)
(M9)
SIP 200 OK
(M10)
SIP 200 OK
Alcatel – Lucent Proprietary
Alcatel – Lucent Proprietary

5. Short Message Service (SMS) Interworking Mobile Terminated SMS
UE1
Femto
IMS CN
HSS
SMS-GW
Mobile Terminated Short Message Service (MT SMS) delivery for UE1
(M1)
UDR
(M2)
UDA
(M3)
SIP MESSAGE
(M4)
SIP MESSAGE
(M5)
Data Burst Message (DBM)
(M6)
SIP 200 OK
(M7)
SIP 200 OK
Alcatel – Lucent Proprietary
Alcatel – Lucent Proprietary

6. Call Hold Without Announcement
UE1
Femto
P-CSCF
S-CSCF AS
UE2
(M1)
Flash message
(M2)
ReINVITE (sendonly)
(M3)
(M4)
AS determines no announcement will be played
(M5)
(M6)
(M7)
(M8)
200 OK (recvonly)
(M9)
(M10)
(M11)
(M12)
(M13)
(M14)
ACK
(M15)
(M16)
(M17)
(M18)
(M19)
Stable call in talk state between UE1 (3G-1X UE accessing a Femto) and UE2 (IMS compliant UE)
Alcatel – Lucent Proprietary
Alcatel – Lucent Proprietary