Interworking with LTE Source: Mike Dolan Tony Lee Chair, TSG-X.5 PDSChair, TSG-C.2.2...
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Transcript of Interworking with LTE Source: Mike Dolan Tony Lee Chair, TSG-X.5 PDSChair, TSG-C.2.2...
Interworking with LTESource:
Mike Dolan Tony LeeChair, TSG-X.5 PDS Chair, TSG-C.2.2Alcatel-Lucent VIA [email protected] [email protected]
June 14, 2012 cdma2000 Technology Workshop 广州 Slide 2
Interworking with LTEOutline
• 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 GatewayMME
eNodeB
HSS/AAA
Home Agent
Internet
HSGW PDSN
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
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
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 theApplication 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
3. OtherRATMeasurementRequest
4. OtherRATMeasurementReport
6. InterRATRedirect
eHRPDAN
eAT
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
June 14, 2012 cdma2000 Technology Workshop 广州 Slide 14
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
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 http://www.3gpp2.org.
INFORMATION LINKS
About 3GPP2 http://www.3gpp2.org/Public_html/Misc/AboutHome.cfm
Partners http://www.3gpp2.org/Public_html/Misc/PartnersHome.cfm
Members http://www.3gpp2.org/Public_html/Misc/Memberindex.cfm
Committees http://www.3gpp2.org/Public_html/Misc/CommitteesHome.cfm
Specifications http://www.3gpp2.org/Public_html/specs/index.cfm
Procedures http://www.3gpp2.org/Public_html/Misc/ProceduresHome.cfm
News/Events http://www.3gpp2.org/Public_html/News/index.cfm
Contact us http://www.3gpp2.org/Public_html/Misc/contactinfo.cfm
How to join http://www.3gpp2.org/Public_html/Misc/HowJoinHome.cfm
Related Links http://www.3gpp2.org/Public_html/Misc/RelatedHome.cfm
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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 LTERadio 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 LTERadio Level
• LTE eHPRD non-optimized handoff– S-101 interface is not used.
June 14, 2012 cdma2000 Technology Workshop 广州 Slide 24
LTE 1x Tunnelingon S102
• Supports:– Circuit Switch Fall Back (CSFB)– Enhanced CSFB (eCSFB)– SMS, mobile-originated and mobile-
terminated