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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 mike.dolan@alcatel-lucent.com aslee@via-telecom.com. June 19, . cdma2000 Technology Webinar. Interworking with LTE Outline. At the CORE and RAN Level

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interworking with lte

Interworking with LTE

Source:

Mike Dolan Tony Lee

Chair, TSG-SX.5 PDS Chair, TSG-AC.2.2

Alcatel-Lucent VIA Telecom

mike.dolan@alcatel-lucent.comaslee@via-telecom.com

June 19,

cdma2000 Technology Webinar

interworking with lte outline
Interworking with LTEOutline
  • 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

lte ehprd how ehrpd connects to the same enhanced packet core epc
LTE  eHPRDHow eHRPD connects to the same Enhanced Packet Core (EPC)

HSS/AAA

Internet

3GPP2 AAA

PCRF

PDN Gateway

Home Agent

MME

Serving Gateway

Signaling

Data

eNodeB

UE

eAN/ePCF

AN/PCF

HSGW

PDSN

cdma2000 Technology Webinar

handoff from lte to ehrpd
Handoff from LTE to eHRPD

HSS/AAA

Internet

PCRF

PDN Gateway

MME

Serving Gateway

HSGW

Signaling

Data

eNodeB

eAN/ePCF

UE

cdma2000 Technology Webinar

circuit switched fall back csfb core network and ran
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.

cdma2000 Technology Webinar

slide6
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.

MSC

IWS

MME

S102

eNodeB

1x BS

UE

Signaling

Data

cdma2000 Technology Webinar

slide7
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.

Both mobile-originated and mobile-terminated are supported.

MSC

IWS

MME

S102

eNodeB

1x BS

UE

Signaling

Data

cdma2000 Technology Webinar

lte to ehrpd protocol architecture
LTE to eHRPD protocol architecture

HRPD upper layers

Signaling Adaptation Protocol

HRPD lower layers

LTE AS layers

cdma2000 Technology Webinar

ehrpd to lte
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

cdma2000 Technology Webinar

ehrpd e utran inter rat redirection
eHRPD  E-UTRAN inter-RAT redirection

cdma2000 Technology Webinar

lte to 1x tunneling
LTE to 1x tunneling

1x Layer 3

1x lower layers

GCSNA

LTE AS layers

cdma2000 Technology Webinar

1x to lte
1x to LTE

OtherRATNeighborList Message

Broadcasted message

Contains E-UTRAN information for AT to search for E-UTRAN system

Threshold

cdma2000 Technology Webinar

slide14

Thank You!

For more information, please visit http://www.3gpp2.org.

slide15

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

Additional Information

cdma2000 Technology Webinar

signaling adaptation protocol context
Signaling Adaptation Protocol Context

cdma2000 Technology Webinar

sap functionalities
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

changes to mac and phy layer
Changes to MAC and PHY Layer

Initial output power calculation

X0 = - Mean RX Power (dBm) + OpenLoopAdjust + PilotInitialAdjustwhere:PilotInitialAdjust = InitialAdjust + min(PilotStrengthCorrectionMax, max(PilotStrengthNominal – PilotStrength, PilotStrengthCorrectionMin)),

This is necessary due to lack of access probe power correction.

cdma2000 Technology Webinar

interworking with lte radio level
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

cdma2000 Technology Webinar

interworking with lte radio level1
Interworking with LTERadio Level

LTE  eHPRD non-optimized handoff

S-101 interface is not used.

cdma2000 Technology Webinar

lte 1x tunneling on s102
LTE  1x Tunnelingon S102

Supports:

Circuit Switch Fall Back (CSFB)

Enhanced CSFB (eCSFB)

SMS, mobile-originated and mobile-terminated

cdma2000 Technology Webinar

lte ehrpd protocol structure
LTE-eHRPD Protocol Structure

cdma2000 Technology Webinar

air interface protocol enhancements
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

changes to the application layer
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

cdma2000 Technology Webinar

lte to 1x tunneling1
LTE to 1x tunneling

S102 Tunnel

cdma2000 Technology Webinar