3gpp2 wrksp-20120315-xxxr0 2012 workshop planning title: interworking with lte source: mike dolan,...
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3GPP2 WRKSP-20120315-xxxr0
2012 Workshop Planning
Title: Interworking with LTE
Source: Mike Dolan, Tony Lee
Abstract:
Draft Presentation on Interworking with LTE
Recommendation:
Review and Approve.
© 2012 3GPP2The contributors grant a free, irrevocable license to 3GPP2 and its Organizational Partners to incorporate text or other copyrightable material contained in the contribution and any modifications thereof in the creation of 3GPP2 publications; to copyright and sell in Organizational Partner's name any Organizational Partner's standards publication even though it may include all or portions of this contribution; and at the Organizational Partner's sole discretion to permit others to reproduce in whole or in part such contribution or the resulting Organizational Partner's standards publication. The contributors are also willing to grant licenses under such contributor copyrights to third parties on reasonable, non-discriminatory terms and conditions for purpose of practicing an Organizational Partner's standard which incorporates this contribution. This document has been prepared by the contributors to assist the development of specifications by 3GPP2. It is proposed to the Committee as a basis for discussion and is not to be construed as a binding proposal on the contributors. The contributors specifically reserves the right to amend or modify the material contained herein and to any intellectual property of the contributors other than provided in the copyright statement above.
COPYRIGHT © 2012 3GPP2. ALL RIGHTS RESERVED.
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 xxx
LTE cdma2000® 1x xxx
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LTE eHPRD How eHRPD connects to the same Enhanced Packet Core (EPC)
PDN Gateway
Serving Gateway
MME
eNodeB
HSS/AAA
Home Agent
Internet
HSGWPDSN
eAN/ePCF
AN/PCF
PCRF
3GPP2 AAA
Signaling
Data
UE
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Non-Optimized Handoff from LTE to eHRPD
PDN Gateway
Serving Gateway
MME
eNodeB
HSS/AAA Internet
HSGW
eAN/ePCF
PCRF
Signaling
Data
UE
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Optimized Handoff from LTE to eHRPDStep 1 – Establish context on eHRPD via tunneled signaling
PDN Gateway
Serving Gateway
MME
eNodeB
HSS/AAA Internet
HSGW
eAN/ePCF
PCRF
Signaling
Data
UE
S101
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Optimized Handoff from LTE to eHRPDStep 2 – UE moves to eHRPD, bearers are moved
PDN Gateway
Serving Gateway
MME
eNodeB
HSS/AAA Internet
HSGW
eAN/ePCF
PCRF
Signaling
Data
UE
S101
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Comparison of Optimized vs. Non-Optimized
Optimized handoff takes less than 300 msec.
Non-optimized handoff can take as much as 5-7 seconds.
Optimized handoff requires in addition to what non-optimized needs:
S101 tunneling
Upgrades on the UE, MME, eAN/ePCF, HSGW
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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
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CSFB
MME
eNodeB
IWS
1x BS
Signaling
Data
UE
MSC
S102
• 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.
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eCSFB
MME
eNodeB
IWS
1x BS
Signaling
Data
UE
MSC
S102
• Page sent to IWS.
• IWS sends page to UE via MME and eNodeB using S102.
• UE sends a page response via the eNodeB and MME.
• IWS sends a handoff command (UHDM) to the UE via S102, and sets up the traffic channel on 1x in preparation for the UE.
• UE does a handoff to the 1x traffic channel.
• 1x call proceeds.
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Comparison of CSFB to eCSFB
CSFB requires extra time on 1x due to hashing and other procedures.
For eCSFB, the traffic channel is prepared and waiting for the UE to arrive.
Some issues at the radio level will be discussed later, when the radio level is covered.
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SMSBoth mobile originated and mobile terminated are supported.
MME
eNodeB
IWS
1x BS
Signaling
Data
UE
MSC
S102MT-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.
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Interworking with LTERadio Level LTE eHPRD (optimized handoff)Requires S-101
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HRPD-LTE Dual Mode 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
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• New protocols to support LTE to eHRPD
Default Signaling Adaptation Protocol (no counterpart in HRPD)
InterRAT Initialization Protocol
InterRAT Idle State Protocol
InterRAT Route Update Protocol
InterRAT Overhead Message Protocol
InterRAT Signaling Adaptation Protocol (no counterpart in HRPD)
• Additional new protocols to support LTE to eHRPD with air interface that support C.S0024-B
InterRAT Quick Idle State Protocol
Subtype 1 based InterRAT Route Update Protocol
InterRAT Overhead Message Protocol for C.S0024B
New protocols
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• Default Airlink Management Protocol
• Default Connected State Protocol
• Default Packet Consolidation Protocol
• Application layer:
Muliti-Flow Packet Application
Enhanced Multi-Flow Packet Application
Multi-Link Mulit-Flow Packet Application
• Session layer:
Default Session Management Protocol
Default Address Management Protocol
Existing protocols affected (1)
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• Subtype 3 RTC MAC
• Subtype 2 Physical Layer
• Subtype 4 RTC MAC
• Subtype 3 Physical Layer
Existing Protocols affected (2)
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• To handle connection between HRPD upper layer to LTE lower layers
HRPD upper layer = Connection Layer and above
LTE lower layer = MAC and below
The behavior of the HRPD control protocols are very different when connected to the LTE tunnel
• Tunneled mode/state:
This mobile enters this mode when it is connected to LTE
SIB 8 provides the overhead parameters, such as System Time, Neighbors PN, etc
“Tunneled State” describes the behavior of the HRPD protocol when the mobile is connected to the LTE tunnel
Under tunneled state, each IRAT protocol behave differently as compare to their normal state
Provide periodic pilot measurement
Why the Inter RAT protocols?
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• IRAT Initialization state protocol
“Bypass” pilot acquisition and synchronization state
It uses the SIB 8 information to establish timing
• IRAT Idle state protocol
Introduced “Tunneled state” in the state transition diagram
No sleep or wake up
No monitoring of control channel
Perform pilot measurement
Functionalities of IRAT protocols when in tunneled mode (1)
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• IRAT Route Update Protocol
Pilot supervision is disabled
Radius based RUP message is disabled
• IRAT Overhead Message Protocol
Store overhead parameters from SIB 8
Transmit the OtherRATNeighborList Message
Does not activate supervision timers
Functionalities of IRAT protocols when in tunneled mode (2)
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Signaling Adaptation Protocol - Context
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• It keeps record of which air interface (HRPD or non-HRPD) the access terminal is currently receiving service in
• When requested by upper layer protocols, it provides a virtual connection service between the access terminal and the access network over a non-HRPD radio access technology tunnel when the access terminal is receiving service in a non-HRPD radio access technology
• Provides encapsulation of HRPD packets when sent over a non-HRPD radio access technology tunnel
• Triggers idle and active handoffs from a non-HRPD radio access technology to HRPD access networks
• It has a control plane as well as a user plane functionality
SAP functionalities
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SAP states
Close State
Setup State
Open State
Tx AlternateLinkOpenReq Rx AlternateLinkOpenConf
Rx AlternateLinkOpenFail
Initial State
Tx AlternateLinkCloseConf or Rx AlternateLinkCloseConf
Close State: The virtual connection does not existSetup State: The virtual connection setup is in progressOpen State: In this state the virtual connection is open.
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• 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
• Introduce Protocol ID 7 and 8
Changes to Application Layer
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• 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 no access probe power correction
Changes to MAC and PHY Layer
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eHPRD to LTE
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• OtherRATNeighborList Message
Broadcast by Overhead Message Protocol
Contains E-UTRAN information for AT to search for E-UTRAN system
Threshold
• InterRATRedirect
Send by Airlink Management Protocol
Contains E-UTRAN redirection information
Two ways :
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OtherRATNeighborList: E-UTRAN record
Broadcast by Overhead Message Protocol
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InterRATRedirection: E-UTRAN redirection record
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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 to E-UTRAN redirection
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Circuit Switch Fall Back
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LTE to 1x tunneling
Lower Layer (Other Access Technology)
Lower Layer (Other Access Technology)
Lower Layer Lower Layer
MSOther Access
Technology Entity(ies)IWS
Lower Layer (Other Access Technology)
Lower Layer (Other Access Technology)
Lower Layer Lower Layer
MSOther Access
Technology Entity(ies)IWS
1x Layer 3
PDU
1x Layer 3
PDU
GCSNA Control
TLAC HeaderGCSNA Header
GCSNA Control
TLAC HeaderGCSNA Header
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• All supported layer 3 messages are listed under C.R1001
• The supported messages are based on revision and class
Revision 0 Class 0 = Release 8 1xCSFB
Revision 1 Class 0 = Release 9 e1xCSFB
Revision 0 Class 1 = SRVCC
• Example: Messages supported under Release 8 1x CSFB
Data Burst (F/R) Authentication Challenge (F)
Shared Secret Data Update (F) General Page Message (F)
Registration Accepted/Rejected/Request Order (F)
Base Station Challenge Confirmation Order
Registration Message
Supported Layer 3 PDU
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• Stands for: Tunneling LAC
• Contains essential layer 2 fields
• Two set of fields:
r-csch Addressing Sublayer Record
r-csch Authentication and Message Integrity Sublayer Record
TLAC header
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GCSNA header
Field Length (bits)
MessageID 8
GCSNAOption 8
AlternativeGCSNAOption_INCL 1
NumAlternativeGCSNAOptions 0 or 8
If NUMAlternativeGCSNAOptions field is included, NumAlternativeGCSNAOptions occurrences of the following field: Otherwise, 0 occurrences of the following field:
{
AlternativeGCSNAOption 8
}
IWSIDIncl 1
IWS_ID 0 or 16
AckRequired 1
StopDupDetect 1
MessageSequence 6
Reserved 0 to 7
TLACEncapsulated1xL3PDU Variable
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Example GCSNA Callflow
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• In 1x Rev E, the Alternate Technology Information Message can carries the E-UTRAN record as defined in C.S0097
Idle handoff to LTE
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