redirect with system information.pdf

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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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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


rimCapable Specifies whether a target TD-SCDMA cell is RIM capable


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


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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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


Coverage-Triggered TD-SCDMASession Continuity


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

redirect with system information.pdf

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