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 Telecommike.dolan@alcatel-lucent.com aslee@via-telecom.com

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

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 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