redirect with system information.pdf
TRANSCRIPT
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Redirect with System Information
USER DESCRIPTION
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Copyright
Ericsson AB 2012. All rights reserved. No part of this document may bereproduced in any form without the written permission of the copyright owner.
Disclaimer
The contents of this document are subject to revision without notice due tocontinued progress in methodology, design and manufacturing. Ericsson shallhave no liability for any error or damage of any kind resulting from the useof this document.
Trademark List
All trademarks mentioned herein are the property of their respective owners.These are shown in the document Trademark Information.
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Contents
Contents
1 Introduction 1
1.1 Basic Characteristics 1
1.2 Benefits 1
1.3 Additional Information 1
2 Feature Operation 3
2.1 Network Requirements 3
2.2 Feature Operation Sequence Diagram 3
2.3 Process Steps 3
3 Parameters 5
3.1 Introduced Parameters 5
3.2 Affected Parameters 6
4 Network Impact 7
4.1 RAN Information Methods for SI Tunneling 7
4.2 Mobility 7
5 Associated Features and Affected Functions 9
5.1 Prerequisite Features 9
5.2 Affected Features 9
5.3 Related Features 9
5.4 Affected System Functions 10
6 Performance 11
6.1 KPIs 11
6.2 Counters 11
6.3 Events 11
7 O&M Information 13
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Introduction
1 Introduction
This document describes the Redirect with System Information feature and itsmain benefits and impacts in the LTE RAN.
1.1 Basic Characteristics
This section describes the basic characteristics of the feature.
Feature Identity
TDD: FAJ 221 0876, Redirect with System Information
Replaces: N/A
Dependencies
This feature requires that one of following RAN features to be active:
Coverage-Triggered GERAN Session Continuity
Coverage-Triggered WCDMA Session Continuity
Coverage-Triggered TD-SCDMA Session Continuity
CS Fallback to GERAN and UTRAN
This feature affects no other features.
1.2 Benefits
This section describes the benefits of this feature.
The benefit of Redirect with System Information feature is that it improvesoutage time when the UE is redirected from LTE to GSM, WCDMA orTD-SCDMA. This is, for example, important when performing a Circuit Switched(CS) fallback from LTE to a GSM, WCDMA or TD-SCDMA network since theUser Equipment (UE) will be able to connect to the circuit switched domainfaster.
1.3 Additional Information
More information about this feature and related topics can be found in thefollowing documentation:
3GPP TS 23.272
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Redirect with System Information
3GPP TS 36.331
3GPP TS 48.018
CS Fallback to GERAN and UTRAN
Coverage-Triggered WCDMA Session Continuity
Coverage-Triggered TD-SCDMA Session Continuity
Coverage-Triggered GERAN Session Continuity
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Feature Operation
2 Feature Operation
This section describes the Redirect with System Information feature in moredetail, including network configuration requirements and operation flows.
2.1 Network Requirements
The following must be fulfilled at feature activation:
The UE must support the e-RedirectionUTRA-r9 ore-RedirectionGERAN-r9 capability. More information can be foundin 3GPP TS 36.331 Section 6.3.6.
The Coverage-Triggered GERAN Session Continuity license must beactivated in case of coverage triggered redirect from LTE to GSM.
The Coverage-Triggered WCDMA Session Continuity license must beactivated in case of coverage triggered redirect from LTE to WCDMA.
The Coverage-Triggered TD-SCDMA Session Continuity license must beactivated in case of coverage triggered redirect from LTE to TD-SCDMA.
The CS Fallback to GERAN and UTRAN and Coverage-Triggered GERANSession Continuity licenses must be activated in case of CS Fallbacktriggered redirect from LTE to GSM.
The CS Fallback to GERAN and UTRAN and Coverage-Triggered WCDMASession Continuity licenses must be activated in case of CS Fallbacktriggered redirect from LTE to WCDMA.
The CS Fallback to GERAN and UTRAN and Coverage-TriggeredTD-SCDMA Session Continuity licenses must be activated in case of CSFallback triggered redirect from LTE to TD-SCDMA.
2.2 Feature Operation Sequence Diagram
This feature extends the features listed in Section 5.1 on page 9 by includingsystem information for cells belonging to target Radio Access Technology(RAT) when performing Radio Resource Control (RRC) connection release withredirect to GSM, WCDMA or TD-SCDMA. The system information enables theUE to connected to target GSM, WCDMA or TD-SCDMA cell faster.
2.3 Process Steps
This section describes the main process steps for the feature flow.
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2.3.1 Configuration
The following parameters must be configured for the Redirect with SystemInformation feature to operate successfully:
mobilityAction
The parameter must be set to value RELEASE_WITH_REDIRECT_NACCfor the specific RAT for the system information to be included for acoverage-triggered RRC connection release with redirect.
mobilityActionCsfb
The parameter must be set to value RELEASE_WITH_REDIRECT_NACCfor the specific RAT for the system information to be included for CSfallback-triggered RRC connection release with redirect.
2.3.2 Prioritization of Cells
The eNodeB includes system information for up to four GSM, WCDMAor TD-SCDMA cells. If the number of candidate cells is more than four,the eNodeB will prioritize system information for cells based on how thecoverageIndicator MO attribute is configured.
In case of CS Fallback triggered Release with Redirect, the eNodeB willprioritize System Information as follows:
First include System Information for cells with coverageIndicator setto COVERS.
Secondly include System Information for cells with coverageIndicatorset to OVERLAP.
Thirdly include System Information for cells with coverageIndicator setto CONTAINED_IN or NONE.
For coverage-triggered release with redirect, the eNodeB will prioritize systeminformation as follows:
First include system information for cells with parametercoverageIndicator set to COVERS.
Secondly include system information for cells with parametercoverageIndicator set to NONE.
Thirdly include system information for cells with parametercoverageIndicator set to OVERLAP.
Forth include system information for cells with parametercoverageIndicator set to CONTAINED_IN.
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Parameters
3 Parameters
This section describes parameters introduced by the Redirect with SystemInformation feature and parameters affected by activating the feature.
3.1 Introduced Parameters
Table 1 describes the parameters introduced by the feature.
Table 1 Introduced Parameters
Parameter Description
rimCapable Specifies whether a target GSM cell is RIM capable
This attribute controls whether the eNB will try to fetch systeminformation for the cell.
rimCapable Specifies whether a target WCDMA cell is RIM capable
This attribute controls whether the eNB will try to fetch systeminformation for the cell.
rimCapable Specifies whether a target TD-SCDMA cell is RIM capable
This attribute controls whether the eNB will try to fetch systeminformation for the cell.
rimAssociationStatus Indicates whether the eNB currently retrieves valid systeminformation elements for the target GSM cell.
rimAssociationStatus Indicates whether the eNB currently retrieves valid systeminformation elements for the target WCDMA cell.
rimAssociationStatus Indicates whether the eNB currently retrieves valid systeminformation elements for the target TD-SCDMA cell.
Table 2 describes the parameters that are related to this feature.
Table 2 Related Parameters
Parameter Description
mobilityAction Preferred way to transfer UE in connected mode to a GERANfrequency group for coverage triggered mobility
mobilityAction Preferred way to transfer UE in connected mode to a UTRAN FDDfrequency for coverage-triggered mobility
mobilityAction Preferred way to transfer UE in connected mode to a UTRAN TDDfrequency for coverage-triggered mobility
mobilityActionCsfb Preferred way to transfer UE in connected mode to a GERANfrequency group for CS fallback
mobilityActionCsfb Preferred way to transfer UE in connected mode to a UTRAN FDDfrequency for CS fallback
mobilityActionCsfb Preferred way to transfer UE in connected mode to a UTRAN TDDfrequency for CS fallback
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Parameter Description
coverageIndicator Defines whether the coverage area of the E-UTRAN cell andthe GERAN cell are indicated to overlap (has approximately thesame coverage area), whether the coverage area of the GERANcell is indicated to cover the E-UTRAN cell, or if it is contained inthe E-UTRAN cell
coverageIndicator Defines whether the coverage areas of the E-UTRAN celland the UTRAN FDD/TDD cell are indicated to overlap (haveapproximately the same coverage area), whether the coveragearea of the UTRAN FDD/TDD cell is indicated to cover theE-UTRAN cell, or if it is contained in the E-UTRAN cell
3.2 Affected Parameters
The implementation of this feature affects no parameters.
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Network Impact
4 Network Impact
This section describes how the Redirect with System Information featureimpacts the network functions and capabilities.
4.1 RAN Information Methods for SI Tunneling
For the Redirect with System Information feature to function properly, thesystem information must be accessible to the eNB.
The eNB requests system information from the target cells using RanInformation Methods (RIMs) and this feature must be supported by the targetRAT. This requires that the RIM NACC Packet Data Unit (PDU) is used forretrieving system information from GSM, WCDMA or TD-SCDMA target cells.
4.2 Mobility
The Redirect with System Information feature reduces outage time for releasewith redirect from LTE to GSM, WCDMA or TD-SCDMA.
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Associated Features and Affected Functions
5 Associated Features and AffectedFunctions
This section describes how the Redirect with System Information feature affectsother features and functions.
5.1 Prerequisite Features
Table 3 lists prerequisite features to the Redirect with System Informationfeature, that is, they must be active prior to introducing the Redirect withSystem Information feature.
Table 3 Prerequisite Features
Feature Description
Coverage-Triggered GERAN SessionContinuity
This feature is required for coverage triggered or CSfallback-triggered redirect from LTE to GSM.
Coverage-Triggered WCDMA SessionContinuity
This feature is required for coverage triggered or CSfallback-triggered redirect from LTE to WCDMA.
Coverage-Triggered TD-SCDMASession Continuity
This feature is required for coverage triggered or CSfallback-triggered redirect from LTE to TD-SCDMA.
CS Fallback to GERAN and UTRAN This feature is required for CS fallback from LTE to GSM,WCDMA or TD-SCDMA.
5.2 Affected Features
Table 4 lists features that are affected by the Redirect with System Informationfeature feature.
Table 4 Affected Features
Feature Description
Coverage-Triggered WCDMA SessionContinuity
The IRAT access times of this feature are improved.
Coverage-Triggered GERAN SessionContinuity
The IRAT access times of this feature are improved.
Coverage-Triggered TD-SCDMASession Continuity
The IRAT access times of this feature are improved.
CS Fallback to GERAN and UTRAN The IRAT access times of this feature are improved.
5.3 Related Features
This feature is not related to any other feature.
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5.4 Affected System Functions
This feature affects no system functions.
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Performance
6 Performance
This section describes performance indicators, counters, and events associatedwith the Redirect with System Information feature.
6.1 KPIs
This feature has no associated Key Performance Indicators (KPIs).
6.2 Counters
Table 5 lists the important counters associated with the Redirect with SystemInformation feature.
Table 5 Counters
Counter Description
pmUeCtxtRelSCGsm Number of coverage-triggered RRC connection releases withredirect to GSM
pmUeCtxtRelSCGsm The number of CS fallback-triggered RRC connection releaseswith redirect to GSM
pmUeCtxtRelSCGsm Number of CS fallback Emergency-triggered RRC connectionreleases with redirect to GSM
pmUeCtxtRelSCWcdma Number of coverage-triggered RRC connection releases withredirect to WCDMA
pmUeCtxtRelCsfbWcdma The number of CS fallback-triggered RRC connection releaseswith redirect to WCDMA
pmUeCtxtRelCsfbWcdmaEm Number of CS fallback Emergency-triggered RRC connectionreleases with redirect to WCDMA
pmUeCtxtRelSCTdScdma Number of coverage-triggered RRC connection releases withredirect to TD-SCDMA
pmUeCtxtRelCsfbTdScdma The number of CS fallback-triggered RRC connection releaseswith redirect to TD-SCDMA
pmUeCtxtRelCsfbTdScdmaEm Number of CS fallback Emergency-triggered RRC connectionreleases with redirect to TD-SCDMA
More information about counters can be found in Managed Object Model RBS.
6.3 Events
Table 6 lists the important events associated with the Redirect with SystemInformation feature.
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Table 6 Events
Event Event Parameter Description
INTERNAL_EVENT_UE_MOBILITY_EVAL
EVENT_PARAM_MOBILITY_DECISION
EVENT_PARAM_RELEASE_WITH_REDIRECT_REASON
This event is generated when theUE is released with redirection toanother radio access technology.
Indicates the decision the mobilityevaluation has taken.
This attribute indicates if therehave been problems with thefeature, e.g. lack of UE support orlack of licenses.
More information about events can be found in PM Event List.
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O&M Information
7 O&M Information
This section provides Operation and Maintenance (O&M) information for theRedirect with System Information feature.
License handling is described in License Management. General ManagedObject Model (MOM) handling is described in Managed Object Model RBS.
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toc1 Introduction1.1 Basic CharacteristicsDependencies1.2 Benefits1.3 Additional Information2 Feature Operation2.1 Network Requirements2.2 Feature Operation Sequence Diagram2.3 Process Steps2.3.1 Configuration2.3.2 Prioritization of Cells3 Parameters3.1 Introduced Parameters3.2 Affected Parameters4 Network Impact4.1 RAN Information Methods for SI Tunneling4.2 Mobility5 Associated Features and Affected Functions5.1 Prerequisite Features5.2 Affected Features5.3 Related Features5.4 Affected System Functions6 Performance 6.1 KPIs6.2 Counters6.3 Events7 O&M Information