0. eHRPD and LTE Interworking CDG Americas Regional Conference
San Diego
11 November 2009
© 3GPP2

1. eHRPD (evolved High Rate Packet Data)
Overview
eHRPD (evolved High Rate Packet Data)
Attaching the HRPD access network to the Evolved Packet Core (EPC) IP environment via PMIP
LTE Interworking
eHRPD – optimized and non-optimized handoff
1x Circuit-Switched Fall Back (1xCSFB)
1x Single Radio Voice Call Continuity (1x SRVCC)
Summary
Purpose of Slide: Introduce topics to be covered in the presentation.

2. eHRPD Connectivity to EPC Architecture
Legend
Internet
EPC entity
IMS
Operator Appls.,
Etc.
3GPP2 entity
HSS IP
Signaling
Bearer
AAA
PCRF
PDN GW
HSGW
Purpose of this slide: 3GPP2 Mission Statement
ePCF
eAN
(Not all interfaces are shown in this figure.) UE

3. 3GPP2 eHRPD Specifications
TSG-X: X.S0057 – core network
TSG-A: A.S0022 – radio access network
TSG-C: C.S0087 – air interface
TSG-C: C.S0095 – signaling and conformance tests
TSG-S: S.R0129 – requirements
TSG-S: S.R0138 – security
Revision levels are aligned to 3GPP releases
Rel-8: X.S0057-0, A.S0022-0, C.S0087-0
Rel-9: X.S0057-A, A.S0022-A, C.S0087-A
Rel-10: X.S0057-B, A.S0022-B, C.S0087-B
Point Releases are used to support bug fixes/changes:
E.g., X.S v1.0/v2.0/v3.0 etc. – 3GPP Rel-8

4. eHRPD Connectivity to EPC Architecture
Legend
Internet
LTE-specific entity
IMS
Operator Appls.,
Etc.
EPC entity
HSS
3GPP2 entity IP
Signaling
Bearer
AAA
PCRF
PDN GW
MME
SGW
HSGW
Purpose of this slide: 3GPP2 Mission Statement
S103
ePCF
eAN
eNB
S101
(Not all interfaces are shown in this figure.) UE

5. LTE  eHRPD Handoff Optimized Handoff Non-Optimized Handoff
Involves the use of S101 and S103 to minimize the gap in packet flow to reach the goal of < 300 ms.
Signaling changes on the air interface to support S101 based tunneling.
UE establishes context on eHRPD by signaling over S101.
eNodeB (via the MME) and eAN coordinate the handoff.
Non-Optimized Handoff
The UE leaves LTE coverage, attaches to eHRPD, builds context, and resumes packet flow.
Support in LTE to direct the handoff and provide eHRPD parameters.
Latency can be several seconds.

6. eHRPD  LTE Idle Hand-Up
LTE neighbor information is provisioned and broadcast by the eHRPD network.
Reduce searches for LTE pilots.
Minimize the device battery power consumption.
Uses reselection (idle handoff) parameters and procedures.
Similar parameters and procedures will be used for idle hand-up from 1x to LTE.
eHRPDLTE active Hand-Up has not been defined by 3GPP.

7. LTE – 1x CSFB/SRVCC Architecture
Legend
LTE-specific entity
Internet
IMS
Operator Appls.,
Etc.
EPC entity
3GPP2 entity
HSS/AAA
HLR IP
Signaling
Bearer
MGW
PCRF
PDN GW
MSC
MME
SGW
Purpose of this slide: 3GPP2 Mission Statement
S102
eNB
IWS BS UE

8. LTE – 1x CSFB
LTE can be configured for Data, while Voice services are provided on cdma2000 1x.
LTE uses the S102 interface to transparently pass cdma2000® 1x signaling to and from the cdma2000 1x system.
Includes support for:
Registration
Paging for Mobile Terminated Calls
SMS
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 this presentation), cdma2000® is a registered trademark of the Telecommunications Industry Association (TIA-USA) in the United States.

9. LTE – 1x SRVCC
Single Radio Voice Call Continuity anchors a voice call in IMS.
Call is transferred from the packet environment to the MSC-based circuit environment.
Control is maintained in IMS.
May reduce latency in voice call handoff from packet to circuit.
Being considered for cdma2000 1x voice call originations and terminations via S102 to reduce delays.

10. 3GPP2 will continue to cooperate with 3GPP to enhance:
Future Work
3GPP2 will continue to support operators that choose to deploy LTE technologies.
3GPP2 will continue to cooperate with 3GPP to enhance:
eHRPD – LTE interworking
LTE – 1x CSFB / SRVCC
Features made possible by LTE interworking.
Features made possible by attachment to EPC.

11. List of Acronyms AAA – Authentication/Authorization/Accounting
BS – Base Station
CSFB – Circuit-Switched Fall Back
eAN/ePCF – evolved Access Network/evolved Packet Control Function
eHRPD – evolved High Rate Packet Data
eNB – eNodeB – evolved NodeB
EPC – Evolved Packet Core
HLR – Home Location Register
HRPD - High Rate Packet Data
HSGW – HRPD Serving Gateway
HSS – Home Subscriber Server
IMS – IP Multimedia Subsystem
IWS – Interworking Server
LTE – Long Term Evolution
MME – Mobility Management Entity
MGW – Media Gateway
MSC – Mobile Switching Center
PCRF – Policy Control Rules Function
PDN GW – Packet Data Network Gateway
PMIP – Proxy Mobile IP
S-GW – Serving Gateway
SMS – Short Message Service
SRVCC – Single Radio Voice Call Continuity
UE – User Equipment

12. For more information, please visit
Thank You!
For more information, please visit