1. All Rights Reserved © Alcatel-Lucent 2007 SOURCE:Dennis Ong, Alcatel-Lucent John Burgess Alcatel-Lucent CONTACT: hdong@alcatel-lucent.comhdong@alcatel-lucent.com jkburgess@alcatel-lucent.com ABSTRACT: This contribution defines the high level SIP interface between the Femtocell and the IMS network needed to support active IS-2000 circuit voice hand-offs from Femto to Macro and Macro to Femto. TITLE: Femtocell Mobility Needs 3GPP2 Femto Cell Workshop RECOMMENDATION: Alcatel-Lucent grants a free, irrevocable license to 3GPP2 and its Organizational Partners to incorporate text or other copyrightable material contained in the contribution and any modifications thereof in the creation of 3GPP2 publications; to copyright and sell in Organizational Partner's name any Organizational Partner's standards publication even though it may include all or portions of this contribution; and at the Organizational Partner's sole discretion to permit others to reproduce in whole or in part such contribution or the resulting Organizational Partner's standards publication. Alcatel-Lucent is also willing to grant licenses under such contributor copyrights to third parties on reasonable, non-discriminatory terms and conditions for purpose of practicing an Organizational Partner’s standard which incorporates this contribution. 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. S00-FEMTO-20070915-007

2. All Rights Reserved © Alcatel-Lucent 2007 2 | October 15-16, 2007 Introduction Support for mobility between the Macro and the Femto is needed for CDMA IS- 2000 voice calls  Without it, many calls will drop when transitioning from the coverage area of one to the other  No air interface changes needed or desired  Define concept of inter-working function, MAP Femto Inter-working Function (MFIF) to convert the content of hand-off related messages:  SIP into MAP  MAP into SIP  Standardize content of SIP messages between Femto and Core Network (CN)  What information Femto needs to provide to the CN  What information the CN needs to provide to the Femto  Order of information delivery  Compatibility with MAP messaging

3. All Rights Reserved © Alcatel-Lucent 2007 3 | October 15-16, 2007 MAP Femto Interface Function (MFIF) The Core Network function MFIF inter-works between the 1X Network and the IMS Network. The MFIF has the following roles:  Serving MSC in the 1X Network  Support standard Mobility Application Part (MAP) protocol  SIP Application Server in the IMS Network  Supports standard ISC interface, following architecture in X.S0013-000 CSCF MSC MAP ISC 1X Network IMS Network MFIF

4. All Rights Reserved © Alcatel-Lucent 2007 4 | October 15-16, 2007 Technical Discussion: Mobility Mobility Event: Femto  Macro hard hand-offs  MAP compatible for CDMA 2000 1x Femto  1x Macro  Femto needs information about the target resources selected  Femto Hand-off trigger info encapsulated into a SIP INFO HO Request message to the core network  Core Network (CN) element MFIF then:  Converts SIP INFO hand-off request message into MAP format  Delivers to target Macro MSC  Converts information returning from MSC in MAP hand-off message into SIP 200 OK message  Femto uses Macro target info in SIP 200 OK message to generate Hand-off Direction message (UHDM)  Expect need for RETURN_IF_FAIL item  Once the hand-off is complete, the Network sends a SIP BYE message to the Femto  Femto replies with SIP 200 OK and frees its resources  All SIP messages linked by same dialog ID

5. All Rights Reserved © Alcatel-Lucent 2007 5 | October 15-16, 2007 Alcatel – Lucent Proprietary UE1-FemtoUE1-MacroFemtoIMS CNPSTNTarget MSCMacro Cell VP1: Existing Call between UE on Femto Cell and the PSTN An existing call between the UE on Femto and the PSTN (M1)Measured Pilot Info (M2)SIP INFO (HO Request) (M3)MAP FACDIR2 (Inter MSC Circuit ID, target cell) Inform the target cell of the handoff request. & use response data to populate FACDIR2 return result. (M4)HANDOFF REQUEST (M5)Handoff response (M6)MAP facdir2 rr VP2: TDM IVT trunk (M7)SIP 200 OK (INFO) (M8)Handoff Direction (UHDM) VP3: TDM or VoIP path UE retunes to target Macro cell VP4: EVRC (M9)Handoff Complete (M10)MAP MSONCH (M11)SIP BYE (M12)SIP 200 OK (BYE) Femto  Macro Handoff

6. All Rights Reserved © Alcatel-Lucent 2007 6 | October 15-16, 2007 Technical Discussion: Mobility Mobility Event: Macro  Femto hard hand-offs  MAP compatible for CDMA 2000 1x Macro  1x Femto  Macro needs information about resources selected at the Femto  MSC sends MAP hand-off request message to MFIF to deliver to Femto target  Core network element “MAP Femto Interface Function” (MFIF) then:  Locates target Femto and initiates dialog with INVITE  Optionally requests available Femto resources with SIP INFO Code Channel Request  Converts MAP format hand-off request message into SIP INFO message  Delivers SIP INFO to target Femto, either specifying code channel or allowing Femto to assign one  Femto responds to MFIF with SIP 200 OK hand-off target information  MFIF Converts information returning from Femto in SIP 200 OK message into MAP hand-off message  Femto sends SIP INFO hand-off complete to MFIF when it hears from the mobile  MFIF acknowledges with SIP 200 OK  MFIF can also cancel the hand-off request with a SIP INFO cancel hand-off

7. All Rights Reserved © Alcatel-Lucent 2007 7 | October 15-16, 2007 Alcatel – Lucent Proprietary UE1-FemtoUE1-MacroFemtoIMS CNPSTNSource MSCMacro Cell Alcatel – Lucent Proprietary VP1: Existing Call between UE on Macro Cell and the PSTN (M1)Measured Pilot Info (M2)Handoff Request (M3)MAP FACDIR2 (Inter MSC Circuit ID, target cell) Send an INVITE to the Femto to initiate a dialog (M4)SIP INVITE (Request-URI=Femto) (M5)SIP 200 OK (INVITE) (M6)ACK Optionally, request the in-use code channel used by the femto (M7)SIP INFO (Code Channel Request) (M8)SIP 200 OK (INFO) Inform the femto of the handoff request. & use response data to populate FACDIR2 return result. (M9)SIP INFO (HO Request) (M10)SIP 200 OK (INFO) (M11)MAP facdir2 rr VP2: TDM IVT trunk (M12)Handoff Direction (UHDM) VP3: TDM or VoIP path UE retunes to target Femto cell VP4: EVRC / VoIP path Macro  Femto Handoff – page 1 of 2

8. All Rights Reserved © Alcatel-Lucent 2007 8 | October 15-16, 2007 Alcatel – Lucent Proprietary UE1-FemtoUE1-MacroFemtoIMS CNPSTNSource MSCMacro Cell (M13)Handoff Complete (M14)SIP INFO (HO Complete) (M15)SIP 200 OK (M16)MAP MSONCH Macro  Femto Handoff – page 2 of 2

9. All Rights Reserved © Alcatel-Lucent 2007 9 | October 15-16, 2007 Technical Discussion: Mobility Message Definition Mobility Event: Femto  Macro hard hand-off messages needing definition  SIP INFO HO Request  SIP 200 OK Target Information  SIP BYE  SIP 200 OK bye

10. All Rights Reserved © Alcatel-Lucent 2007 10 | October 15-16, 2007 Technical Discussion: Mobility Message Definition Mobility Event: Macro  Femto hard hand-off messages  SIP INVITE – start dialog  SIP 200 OK start dialog response  SIP INFO Code Channel Request  SIP 200 OK Code Channel Response  SIP INFO Hand-off Request  CN specifies Code Channel - or  CN tells Femto to select Code Channel  SIP 200 OK Hand-off Target Information  SIP INFO Hand-off Complete  SIP 200 OK  SIP INFO Cancel Hand-off

11. All Rights Reserved © Alcatel-Lucent 2007 11 | October 15-16, 2007 Summary Need to standardize specific SIP messaging to allow all Femtos to allow IS-2000 circuit voice hand-off back and forth with any network More effort needed:  Define any needed “rainy day” messages, if any  Fill in the content of the messages

12. All Rights Reserved © Alcatel-Lucent 2007 12 | October 15-16, 2007 Backup

13. All Rights Reserved © Alcatel-Lucent 2007 13 | October 15-16, 2007 Technical Discussion: Mobility Message Content Mobility Event: Femto  Macro hard hand- off message content  SIP 200 OK Target Info message  USE_TIME  ACTION_TIME  P_REV  SRCH_WIN_A  T_ADD  T_DROP  T_COMP  T_TDROP  NOM_PWR  NUM_PREAMBLE  BAND_CLASS  CDMA_FREQ 1 to 6 of the following target cell entries: PILOT_PN PWR_COMB_IND CODE_CHAN

14. All Rights Reserved © Alcatel-Lucent 2007 14 | October 15-16, 2007 Technical Discussion: Mobility Message Content Mobility Event: Femto  Macro hard hand-off message content  SIP INFO HO Request message  BillingID (Anchor MSC)  ElectronicSerialNumber  InterMSCCircuitID  InterSwitchCount  ServingCellID  CDMACallMode  CDMAChannelData (serving)  CDMAMobileProtocolRevision  HandoffReason  HandoffState  CDMABandClassList  CDMAServiceOptionList (EVRC only)  CDMAStationClassMark  CDMATargetMAHOList (includes TargetOneWayDelay)