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3GPP Doc.Very good to understand LTE aand CDMA interworking.
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Interworking with LTE Source: Mike Dolan Tony Lee Chair, TSG-SX.5 PDS Chair, TSG-AC.2.2 Alcatel-Lucent VIA Telecom [email protected] [email protected]
cdma2000 Technology Webinar June 19,
June 19,2013
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 – LTE eHPRD – eHPRD LTE – Circuit Switch Fall Back(CSFB) – Registration – SMS
June 19, cdma2000 Technology Webinar Slide 2
June 19,2013
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
cdma2000 Technology Webinar
June 19,2013
Handoff from LTE to eHRPD
MME
HSS/AAA Internet
PCRF
Signaling
Data
UE
PDN Gateway
Serving Gateway
eNodeB
HSGW
eAN/ ePCF
cdma2000 Technology Webinar
June 19,2013
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
cdma2000 Technology Webinar
eCSFB (Enhanced CSFB) is an enhanced form of CSFB that shortens the time to setup the call on cdma2000 1x.
June 19,2013
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
cdma2000 Technology Webinar
June 19,2013
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
cdma2000 Technology Webinar
Radio Level
June 19,2013
LTE to eHRPD protocol architecture
June 19,2013
HRPD upper layers
Signaling Adaptation Protocol
HRPD lower layers LTE AS layers
cdma2000 Technology Webinar
June 19,2013
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
cdma2000 Technology Webinar
June 19,2013
3. OtherRATMeasurementRequest
4. OtherRATMeasurementReport
6. InterRATRedirect
eHRPDANeAT
1. AT active on eHRPD
8. UE performs Handoff/Attach to E-UTRA
E-UTRA
9. Search more E-UTRA channel or go back to eHRPD based on MMSS rules (conditional)
5. The eAN decides to redirect the eAT
7. The eAT retunes to E-UTRA
2. The eAN decides to determine E-
UTRA Availability
eHRPD E-UTRAN inter-RAT redirection
cdma2000 Technology Webinar
LTE to 1x tunneling
June 19,2013
1x Layer 3
GCSNA 1x lower layers
LTE AS layers
cdma2000 Technology Webinar
GCSNA=Generic Circuit Service Notification Application
June 19,2013
1x to LTE
• OtherRATNeighborList Message – Broadcasted message – Contains E-UTRAN information for AT to search for E-
UTRAN system – Threshold
cdma2000 Technology Webinar
June 19,2013
Thank You! For more information, please visit http://www.3gpp2.org.
LINKS
About 3GPP2
Partners
Members
Committees
Specifications
Procedures
News/Events
Contact us
How to join
Related Links
June 19,2013
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.
cdma2000 Technology Webinar
Additional Information
cdma2000 Technology Webinar
June 19,2013
Signaling Adaptation Protocol Context
cdma2000 Technology Webinar
June 19,2013
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
cdma2000 Technology Webinar
June 19,2013
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.
cdma2000 Technology Webinar
June 19,2013
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
cdma2000 Technology Webinar
June 19,2013
Interworking with LTE Radio Level
• LTE eHPRD non-optimized handoff – S-101 interface is not used.
cdma2000 Technology Webinar
June 19,2013
LTE 1x Tunneling on S102
• Supports: – Circuit Switch Fall Back (CSFB) – Enhanced CSFB (eCSFB) – SMS, mobile-originated and mobile-
terminated
cdma2000 Technology Webinar
June 19,2013
LTE-eHRPD Protocol Structure
LTE-HRPD multi-mode AT LTE-eNB HRPD RNC
ConnectionLayer
Protocols
LTE-PHY
LTE-MAC
LTE-RRC
LTE-PHY
LTE-MAC
LTE-RRC
HRPD-Security
HRPD-MAC
HRPD-PHY
LTE-MME
LTE-S1
LTE-S1
LTE-S101
LTE-S101
HRPD-StreamProtocol
HRPD-SignalingNetworkProtocol
Radio Link
Protocol
HRPD-Signaling
Link Protocol
HRPD-StreamProtocol
HRPD-SignalingNetworkProtocol
Radio Link
Protocol
HRPD-Signaling
Link Protocol
Connection Layer Protocols
HRPD-Security
HRPD-MAC
HRPD-PHY
S1-AP S101
LTE-Uu
cdma2000 Technology Webinar
June 19,2013
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
cdma2000 Technology Webinar
June 19,2013
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
cdma2000 Technology Webinar
June 19,2013
LTE to 1x tunneling
Lower Layer (Other Access Technology)
Lower Layer (Other Access Technology) Lower Layer Lower Layer
Other Access Technology Entity(ies)
Lower Layer (Other Access Technology)
Lower Layer (Other Access Technology) Lower Layer Lower Layer
MS IWS
1x Layer 3
PDU
1x Layer 3
PDU
GCSNA Control
TLAC HeaderGCSNA Header
GCSNA Control
TLAC HeaderGCSNA Header
S102 Tunnel
cdma2000 Technology Webinar
