Interworking with LTE Source: Mike Dolan Tony Lee Chair, TSG-X.5 PDSChair, TSG-C.2.2 Alcatel-LucentVIA Telecom

June 14, 2012 cdma2000 Technology Workshop 广州 Slide 2 Interworking with LTE Outline At the CORE and RAN Level –LTE  eHPRD How eHRPD connects to the same Enhanced Packet Core (EPC) Handoff –LTE  cdma2000 ® 1x CSFB, eCSFB SMS At the RADIO Level –LTE  eHPRD –eHPRD  LTE –Circuit Switch Fall Back –Registration –SMS June 14, 2012 cdma2000 Technology Workshop 广州 Slide 2

June 14, 2012 cdma2000 Technology Workshop 广州 Slide 3 LTE  eHPRD How eHRPD connects to the same Enhanced Packet Core (EPC) PDN Gateway Serving Gateway MME eNodeB HSS/AAA Home Agent Internet HSGWPDSN eAN/ ePCF AN/ PCF PCRF 3GPP2 AAA Signaling Data UE

June 14, 2012 cdma2000 Technology Workshop 广州 Slide 4 Handoff from LTE to eHRPD MME HSS/AAA Internet PCRF Signaling Data UE PDN Gateway Serving Gateway eNodeB HSGW eAN/ ePCF

June 14, 2012 cdma2000 Technology Workshop 广州 Slide 5 Circuit Switched Fall Back (CSFB) Core Network and RAN Uses tunneled signaling to the UE across the S102 interface between the IWS and MME. This supports: –CSFB, enhanced CSFB (eCSFB) –SMS

June 14, 2012 cdma2000 Technology Workshop 广州 Slide 6 CSFB Page sent to IWS. IWS sends page to UE via MME and eNodeB using S102. UE moves to 1x. UE sends a normal page response on the 1x access channel. Call proceeds. IWS 1x BS Signaling Data UE MSC S102 eNodeB MME

June 14, 2012 cdma2000 Technology Workshop 广州 Slide 7 SMS MT-SMS –SMS are sent via S102 to the UE –UE does not leave LTE. MO-SMS –SMS are sent via S102 from the UE –UE does not leave LTE. IWS 1x BS Signaling Data UE MSC S102 Both mobile-originated and mobile-terminated are supported. eNodeB MME

Radio Level June 14, 2012 cdma2000 Technology Workshop 广州 Slide 8

June 14, 2012 cdma2000 Technology Workshop 广州 Slide 9 LTE-eHRPD Protocol Structure

June 14, 2012 cdma2000 Technology Workshop 广州 Slide 10 Air Interface Protocol Enhancements New protocols to support LTE to eHRPD handover –Default Signaling Adaptation Protocol –Inter-RAT Initialization, Idle State, Route Update, Overhead Message, and Signaling Adaptation Protocols –Support for C.S0024-B Some existing protocols were also affected. Documented in C.S0087

June 14, 2012 cdma2000 Technology Workshop 广州 Slide 11 Changes to the Application Layer Added alternate packet application subtype for: –MFPA -> Alternate MFPA –EMFPA -> Alternate EMFPA –MLMFPA -> Alternate MLMFPA The alternate packet application subtype is to identify the support of eHRPD

June 14, 2012 cdma2000 Technology Workshop 广州 Slide 12 eHRPD to LTE Two methods available: OtherRATNeighborList Message –Broadcasted message –Contains E-UTRAN information for AT to search for E- UTRAN system –Threshold InterRATRedirect –Contains E-UTRAN redirection information

June 14, 2012 cdma2000 Technology Workshop 广州 Slide 13 eHRPD  E-UTRAN inter-RAT redirection

June 14, 2012 cdma2000 Technology Workshop 广州 Slide 14 LTE to 1x tunneling S102 Tunnel

June 14, 2012 cdma2000 Technology Workshop 广州 Slide 15 1x to LTE OtherRATNeighborList Message –Broadcasted message –Contains E-UTRAN information for AT to search for E- UTRAN system –Threshold

June 14, 2012 cdma2000 Technology Workshop 广州 Slide 16 Thank You! For more information, please visit INFORMATIONLINKS About 3GPP2http:// Partnershttp:// Membershttp:// Committeeshttp:// Specificationshttp:// Procedureshttp:// News/Eventshttp:// Contact ushttp:// How to joinhttp:// Related Linkshttp:// 16

June 14, 2012 cdma2000 Technology Workshop 广州 Slide 17 cdma2000 ® is the trademark for the technical nomenclature for certain specifications and standards of the Organizational Partners (OPs) of 3GPP2. Geographically (and as of the date of publication), cdma2000 ® is a registered trademark of the Telecommunications Industry Association (TIA-USA) in the United States.

Additional Information

June 14, 2012 cdma2000 Technology Workshop 广州 Slide 19 Signaling Adaptation Protocol Context

June 14, 2012 cdma2000 Technology Workshop 广州 Slide 20 SAP functionalities Records the current air interface (HRPD or non-HRPD) Provides a virtual connection service between the access terminal and the access network over the S101 tunnel Provides encapsulation of HRPD packets over S101 Triggers idle and active handoffs from LTE to eHRPD It has a control plane as well as a user plane functionality

June 14, 2012 cdma2000 Technology Workshop 广州 Slide 21 Changes to MAC and PHY Layer Initial output power calculation –X0 = - Mean RX Power (dBm) + OpenLoopAdjust + PilotInitialAdjust where: PilotInitialAdjust = InitialAdjust + min(PilotStrengthCorrectionMax, max(PilotStrengthNominal – PilotStrength, PilotStrengthCorrectionMin)), –This is necessary due to lack of access probe power correction.

June 14, 2012 cdma2000 Technology Workshop 广州 Slide 22 Interworking with LTE Radio Level LTE  eHPRD non-optimized handoff –S-101 interface is not used. –Idle handoff from LTE to eHRPD –LTE SIB8 provides information on nearby eHRPD cells

June 14, 2012 cdma2000 Technology Workshop 广州 Slide 23 Interworking with LTE Radio Level LTE  eHPRD non-optimized handoff –S-101 interface is not used.

June 14, 2012 cdma2000 Technology Workshop 广州 Slide 24 LTE  1x Tunneling on S102 Supports: –Circuit Switch Fall Back (CSFB) –Enhanced CSFB (eCSFB) –SMS, mobile-originated and mobile- terminated