1. cdma2000 Technology Webinar
Interworking with LTE
Source:
Mike Dolan Tony Lee
Chair, TSG-SX.5 PDS Chair, TSG-AC.2.2
Alcatel-Lucent VIA Telecom
June 19,
cdma2000 Technology Webinar

2. Interworking with LTE Outline
At the CORE and RAN Level
LTE  eHPRD
How eHRPD connects to the Enhanced Packet Core (EPC)
Handoff
LTE  cdma2000® 1x
CSFB, eCSFB
SMS
At the RADIO Level
eHPRD  LTE
Circuit Switch Fall Back(CSFB)
Registration
June 19,2013
June 19,
cdma2000 Technology Webinar
Slide 2

3. LTE  eHPRD How eHRPD connects to the same Enhanced Packet Core (EPC)
PDN Gateway
Serving Gateway
MME
eNodeB
HSS/AAA
Home Agent
Internet
HSGW
PDSN
eAN/ ePCF
AN/ PCF
PCRF
3GPP2 AAA
Signaling
Data UE
June 19,2013
cdma2000 Technology Webinar

4. Handoff from LTE to eHRPD
HSS/AAA
Internet
PCRF
PDN Gateway
MME
Serving Gateway
HSGW
Signaling
Data
eNodeB
eAN/ ePCF UE
June 19,2013
cdma2000 Technology Webinar

5. Circuit Switched Fall Back (CSFB) Core Network and RAN
CSFB involves the delivery of a page for a cdma2000 voice call to a device operating on LTE
Uses tunneled signaling to the UE across the S102 interface between the IWS and MME. This supports:
CSFB, eCSFB (voice)
SMS
eCSFB (Enhanced CSFB) is an enhanced form of CSFB that shortens the time to setup the call on cdma2000 1x.
June 19,2013
cdma2000 Technology Webinar

6. cdma2000 Technology Webinar
CSFB
MSC
IWS
MME
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.
S102
eNodeB
1x BS UE
Signaling
Data
June 19,2013
cdma2000 Technology Webinar

7. SMS Both mobile-originated and mobile-terminated are supported. MT-SMS
MSC
IWS
MME
S102
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
eNodeB
1x BS UE
Signaling
Data
June 19,2013
cdma2000 Technology Webinar

8. Radio Level
June 19,2013

9. LTE to eHRPD protocol architecture
HRPD upper layers
Signaling Adaptation Protocol
HRPD lower layers
LTE AS layers
June 19,2013
cdma2000 Technology Webinar

10. cdma2000 Technology Webinar
eHRPD to LTE
Two methods available:
OtherRATNeighborList Message
Broadcasted message
Contains E-UTRAN information for AT to search for E- UTRAN system
Threshold
InterRATRedirect
Unicasted message
Contains E-UTRAN redirection information
InterRAT= Inter Radio Access Technology
June 19,2013
cdma2000 Technology Webinar

11. eHRPD  E-UTRAN inter-RAT redirection
June 19,2013
cdma2000 Technology Webinar

12. LTE to 1x tunneling 1x Layer 3 1x lower layers GCSNA LTE AS layers
GCSNA=Generic Circuit Service Notification Application
June 19,2013
cdma2000 Technology Webinar

13. cdma2000 Technology Webinar
1x to LTE
OtherRATNeighborList Message
Broadcasted message
Contains E-UTRAN information for AT to search for E- UTRAN system
Threshold
June 19,2013
cdma2000 Technology Webinar

14. For more information, please visit http://www.3gpp2.org.
Thank You!
For more information, please visit
LINKS
About 3GPP2
Partners
Members
Committees
Specifications
Procedures
News/Events
Contact us
How to join
Related Links
June 19,2013

15. cdma2000 Technology Webinar
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.
June 19,2013
cdma2000 Technology Webinar

16. Additional Information
cdma2000 Technology Webinar

17. Signaling Adaptation Protocol Context
June 19,2013
cdma2000 Technology Webinar

18. cdma2000 Technology Webinar
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 19,2013
cdma2000 Technology Webinar

19. 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 19,2013
cdma2000 Technology Webinar

20. 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 19,2013
cdma2000 Technology Webinar

21. Interworking with LTE Radio Level
LTE  eHPRD non-optimized handoff
S-101 interface is not used.
June 19,2013
cdma2000 Technology Webinar

22. cdma2000 Technology Webinar
LTE  1x Tunneling on S102
Supports:
Circuit Switch Fall Back (CSFB)
Enhanced CSFB (eCSFB)
SMS, mobile-originated and mobile-terminated
June 19,2013
cdma2000 Technology Webinar

23. LTE-eHRPD Protocol Structure
Introduce new changes to handle optimized and non-optimezed handoff
Optimized handoff:
HRPD signaling and data are routed over the LTE protocol stack
Advanced HRPD setup can be accomplish
Non-optimized handoff
No LTE tunneling
LTE broadcast some CDMA parameters through SIB-8
Idle handoff from LTE to eHRPD
June 19,2013
cdma2000 Technology Webinar 23

24. 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 19,2013
cdma2000 Technology Webinar

25. 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 19,2013
cdma2000 Technology Webinar

26. cdma2000 Technology Webinar
LTE to 1x tunneling
S102 Tunnel
June 19,2013
cdma2000 Technology Webinar