mobility between umts and lte(ran13.0_02)

Mobility Between UMTS and LTE RAN13.0

Feature Parameter Description

Issue 02

Date 2011-12-30

HUAWEI TECHNOLOGIES CO., LTD.

Copyright © Huawei Technologies Co., Ltd. 2011. All rights reserved. No part of this document may be reproduced or transmitted in any form or by any means without prior

written consent of Huawei Technologies Co., Ltd.

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and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd.

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The information in this document is subject to change without notice. Every effort has been made in the

preparation of this document to ensure accuracy of the contents, but all statements, information, and

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Mobility Between UMTS and LTE Contents

Issue 02 (2011-12-30) Huawei Proprietary and Confidential

Copyright © Huawei Technologies Co., Ltd

i

Contents 1 Introduction ................................................................................................................................ 1-1

1.1 Scope ............................................................................................................................................ 1-1

1.2 Intended Audience ........................................................................................................................ 1-1

1.3 Change History .............................................................................................................................. 1-1

2 Overview ..................................................................................................................................... 2-1

3 Cell Reselection Between UMTS and LTE .......................................................................... 3-1

3.1 UMTS-to-LTE Cell Reselection ..................................................................................................... 3-1

3.1.1 Criteria for Starting Measurements ....................................................................................... 3-1

3.1.2 Criteria for Triggering Cell Reselection ................................................................................. 3-2

3.2 LTE-to-UMTS Cell Reselection ..................................................................................................... 3-3

4 Service-Based PS Service Redirection from UMTS to LTE ........................................... 4-1

4.1 Overview ....................................................................................................................................... 4-1

4.2 Measurements on LTE Signal Quality ........................................................................................... 4-1

4.3 Target Cell Selection and Execution of Redirections .................................................................... 4-2

5 Engineering Guidelines ........................................................................................................... 5-1

5.1 Mobility Between UMTS and LTE Phase 1 ................................................................................... 5-1

5.1.1 When to Use Mobility Between UMTS and LTE Phase 1 .................................................... 5-1

5.1.2 Feature Activation ................................................................................................................. 5-1

5.1.3 Activation Observation .......................................................................................................... 5-2

5.2 Service-based PS Redirection from UMTS to LTE ....................................................................... 5-2

5.2.1 When to Use Service-based PS Redirection from UMTS to LTE ......................................... 5-2

5.2.2 Deployment Requirements ................................................................................................... 5-2

5.2.3 Feature Activation ................................................................................................................. 5-2

5.2.4 Activation Observation .......................................................................................................... 5-4

5.2.5 Performance Optimization .................................................................................................... 5-4

6 Parameters ................................................................................................................................. 6-1

7 Counters ...................................................................................................................................... 7-1

8 Glossary ...................................................................................................................................... 8-1

9 Reference Documents ............................................................................................................. 9-1

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Mobility Between UMTS and LTE 1 Introduction



1-1

1 Introduction 1.1 Scope This document describes the feature Mobility Between UMTS and LTE.

1.2 Intended Audience This document is intended for:

Personnel who are familiar with WCDMA basics

Personnel who need to understand Mobility Between UMTS and LTE

Personnel who work with Huawei products

1.3 Change History This section provides information on the changes in different document versions.

There are two types of change, which are defined as follows:

Feature change: refers to a change in the feature Mobility Between UMTS and LTE.

Editorial change: refers to a change in wording or the addition of information that was not described in the earlier version.

Document Issue The document issues are as follows:

02 (2011-12-30)

01 (2011-04-30)

Draft B (2011-03-30)

Draft A (2010-12-30)

02 (2011-12-30) This is the document for the second commercial release of RAN13.0.

Compared with issue 01 (2011-04-30) of RAN13.0, this issue is optimized to improve readability.

01 (2011-04-30) This is the document for the first commercial release of RAN13.0.

Compared with issue Draft B (2011-03-30) of RAN13.0, this issue has no change.

Draft B (2011-03-30) This is the draft of the document for RAN13.0.

Compared with Draft A (2010-12-30) of RAN13.0, engineering guidelines is added. For details, see 5 “Engineering Guidelines. ”

Draft A (2010-12-30) This is the draft of the document.

Compared with issue 01 (2010-03-30) of RAN12.0, this issue incorporates the changes described in the following table:

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Mobility Between UMTS and LTE 1 Introduction



1-2

Change Type Change Description Parameter Change

Feature change Descriptions about Service-Based PS service redirection from UMTS to LTE are added. For details, see chapter 4 "Service-Based PS Service Redirection from UMTS to LTE."

The following parameters are added:

EUTRANSHIND

LTEMeasTypOf3C

LTEMeasQuanOf3C

TrigTime3C

U2LTEMeasTime

U2LTEFilterCoef

TargetRatThdRSRP

TargetRatThdRSRQ

Hystfor3C

Editorial change None. None.

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Mobility Between UMTS and LTE 2 Overview



2-1

2 Overview Long-Term Evolution (LTE) is a technology that evolves from Universal Mobile Telecommunications System (UMTS). LTE is gaining momentum to dominate the mobile communications networks.

During the initial stage of LTE network deployment, it is difficult to provide seamless LTE coverage in the entire network. To solve this problem, the feature Mobility Between UMTS and LTE (WRFD-020126 Mobility Between UMTS and LTE Phase 1) is introduced.

With this feature, a UE supporting both UMTS and LTE can obtain higher rates in areas covered by both UMTS and LTE. In addition, the UMTS network can take over LTE UEs in areas where the LTE network does not provide coverage or the LTE network capacity is not enough. The feature protects investments on the existing network, and enables smooth network evolution.

In a common initial deployment scenario, an LTE network provides high-rate mobile broadband services in hotspots, whereas a UMTS network provides low- and medium-rate mobile broadband services and seamless coverage in wide areas.

RAN12.0 supports:

Cell reselection from UMTS to LTE

Cell reselection from LTE to UMTS (see the LTE Feature Documentation)

PS handover from LTE to UMTS for coverage (see the LTE Feature Documentation)

RAN13.0 supports:

Service-Based PS Service Redirection from UMTS to LTE

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Mobility Between UMTS and LTE 3 Cell Reselection Between UMTS and LTE



3-1

3 Cell Reselection Between UMTS and LTE This chapter describes the feature WRFD-020126 Mobility Between UMTS and LTE Phase 1.

Cell reselection between UMTS and LTE has two parts: UMTS-to-LTE cell reselection and LTE-to-UMTS cell reselection.

When camping on the UMTS network, a UMTS/LTE dual-mode UE receives system information from the serving UMTS cell. System information block 19 (SIB19) carries the absolute priorities of the serving UMTS cell and LTE frequencies. If the absolute priorities of one or more LTE frequencies are higher than the absolute priority of the serving UMTS cell, the corresponding LTE cell or cells are the preferred target cells for cell reselection. If the absolute priorities of all LTE frequencies are lower than the absolute priority of the serving UMTS cell, UMTS cells are the preferred target cells for cell reselection.

When camping on the LTE network, a UMTS/LTE dual-mode UE receives system information from the serving LTE cell. SIB3 carries the absolute priority of the serving LTE cell, SIB5 carries the absolute priorities of the LTE frequencies, and SIB6 carries the absolute priorities of the UMTS frequencies. You can manipulate these priorities to favor UMTS or LTE cells as target cells for reselection.

The SibCfgBitMap parameter in the ADD/MOD UCELLSIBSWITCH command specifies whether to broadcast SIB19.

3.1 UMTS-to-LTE Cell Reselection When a UE camping on the UMTS network receives SIB19 and specific conditions are met, the UE starts measuring the LTE signal quality. Based on the measurement results, the UE camps on the best cell by performing reselection.

3.1.1 Criteria for Starting Measurements SIB19 carries the absolute priority of the serving UMTS cell, the absolute priorities of the LTE frequencies, and the cell reselection thresholds. Different radio access technologies (RATs) must have different priorities. Upon receipt of SIB19, the UE does the following:

If the absolute priorities of one or more LTE frequencies are higher than the absolute priority of the serving UMTS cell, the UE starts measuring the signal quality of the LTE frequencies.

The SPriority parameter in the ADD UCELLSELRESEL or MOD UCELLSELRESEL command specifies the absolute priority of the serving UMTS cell.

The NPriority parameter in the ADD UCELLNFREQPRIOINFO or MOD UCELLNFREQPRIOINFO command specifies the absolute priorities of the LTE frequencies.

If the absolute priorities of one or more LTE frequencies are lower than the absolute priority of the serving UMTS cell and the formula SrxlevServingCell ≤ Sprioritysearch1 or SqualServingCell ≤ Sprioritysearch2 is true, the UE starts measuring the signal quality of the LTE frequencies.

Details about these two formulas are as follows:

− The ThdPrioritySearch1 and ThdPrioritySearch2 parameters in the ADD UCELLSELRESEL or MOD UCELLSELRESEL command specify the values of Sprioritysearch1 and Sprioritysearch2, respectively.

− Sprioritysearch1 is a threshold for the received signal code power (RSCP) of the serving UMTS cell. If the serving cell’s RSCP measured by the UE minus Qrxlevmin is not larger than Sprioritysearch1, the UE starts measuring the signal quality of the LTE frequencies whose absolute priorities are lower than the absolute priority of the serving UMTS cell. The larger the value of this parameter, the more likely the UEs are to start the measurements.

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− Sprioritysearch2 is a threshold for the Ec/No of the serving UMTS cell. If the serving cell’s Ec/No measured by the UE minus Qqualmin is not larger than Sprioritysearch2, the UE starts measuring the signal quality of the LTE frequencies whose absolute priorities are lower than the absolute priority of the serving UMTS cell. The larger the value of this parameter, the more likely the UEs are to start the measurements.

− For details about Srxlev and Squal, see 3GPP TS 25.304.

3.1.2 Criteria for Triggering Cell Reselection After measuring the UMTS serving cell and LTE frequencies, the UE shifts to the best cell by performing reselection.

SIB19 carries the absolute priority of the serving UMTS cell, the absolute priorities of the LTE frequencies, and the cell reselection thresholds. The UE performs cell reselection based on the absolute priorities.

The following two groups of criteria apply to UMTS-to-LTE reselection:

Group 1

− The absolute priority of an LTE frequency is higher than the absolute priority of the serving UMTS cell.

− The Srxlev value of the LTE frequency, SrxlevnonServingCell, has remained at or above the threshold Threshhigh for a period of time longer than Treselection.

Group 2

− The absolute priority of an LTE frequency is lower than the absolute priority of the serving UMTS cell.

− SrxlevnonServingCell has remained above Threshlow for a period of time longer than Treselection.

− SrxlevServingCell has remained below Threshserving,low for a period of time longer than Treselection, or SqualServingCell has remained below 0 for a period of time longer than Treselection.

Details about these parameters are as follows:

− Threshhigh is the relative threshold for the target cell’s signal level during reselection to a cell with a higher absolute priority. The ThdToHigh parameter in the ADD UCELLNFREQPRIOINFO or MOD UCELLNFREQPRIOINFO command specifies the value of Threshhigh. The larger the value of this parameter, the less likely reselection is to occur.

− Threshlow is the relative threshold for the target cell’s signal level during reselection to a cell with a lower absolute priority. The ThdToLow parameter in the ADD UCELLNFREQPRIOINFO or MOD UCELLNFREQPRIOINFO command specifies the value of Threshlow. The larger the value of this parameter, the less likely reselection is to occur.

− The Treselections parameter in the ADD UCELLSELRESEL or MOD UCELLSELRESEL command specifies the value of Treselection.

− Threshserving,low is the threshold for the serving cell’s RSCP during reselection to an LTE cell working at an LTE frequency with a lower absolute priority. The ThdServingLow parameter in the ADD UCELLSELRESEL or MOD UCELLSELRESEL command specifies the value of Threshserving,low. When the LTE frequencies of lower absolute priorities are being measured, if the signal quality of the serving UMTS cell constantly remains below Threshserving,low and the signal quality of an LTE frequency satisfies the formula SrxlevnonServingCell > Threshlow, the UE triggers reselection to the cell working at this LTE frequency. The larger the value of this parameter, the more likely reselection is to occur.

To summarize:

If the criteria in group 1 are fulfilled, the UE performs reselection to a cell working at an LTE frequency with a higher absolute priority.

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If t the criteria in group 2 are fulfilled, the UE performs reselection to a cell working at an LTE frequency with a lower absolute priority.

If the criteria in neither group are fulfilled, the UE remains on the UMTS network.

If multiple cells fulfill a group of criteria, the UE performs reselection to the cell with the highest absolute priority. If multiple cells have the highest absolute priority, the UE performs reselection to the cell with the largest SrxlevnonServingCell value.

3.2 LTE-to-UMTS Cell Reselection LTE-to-UMTS cell reselection is used when the LTE network is new and provides incomplete coverage, but the UMTS coverage is complete. LTE-to-UMTS cell reselection is based on absolute priorities and mainly involves the LTE network.

For details, see LTE document Mobility Management in Idle Mode Feature Parameter Description.

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Mobility Between UMTS and LTE

4 Service-Based PS Service Redirection from

UMTS to LTE



4-1

4 Service-Based PS Service Redirection from UMTS to LTE 4.1 Overview This chapter corresponds to the features WRFD-020129 Service-Based PS Service Redirection from UMTS to LTE.

After a UE sets up a PS service on the UMTS network, a PS redirection is used to shift the UE and the PS service to the LTE network when the LTE signal quality fulfills the criteria.

During a UMTS-to-LTE PS redirection, the RNC sends the UE an RRC Connection Release message, which contains LTE frequencies. After the connection is released, the UE enters idle mode on the UMTS network, selects the LTE network, and sets up a PS service on it.

Service-based UMTS-to-LTE PS redirections is mainly used in the following two situations:

A UE that has fallen back to the UMTS network by using CSFB is still processing PS services and the LTE signal quality is good when the UE’s voice services are complete, that is UE received RADIO BEARER RELEASE COMPLETE messages of voice services. In this scenario, a PS redirection improves PS service quality.

A UE only initiates a PS service on the UMTS network in a UMTS/LTE overlapping coverage area and the LTE signal quality is good. In this scenario, a redirection improves user experience and makes more efficient use of the LTE network.

To minimize the possibility of redirection failures, UMTS-to-LTE PS redirections are based on the LTE signal quality measurements. Redirections are only triggered if the LTE signal quality is good.

LTE-to-UMTS PS redirections are performed mainly by the LTE network. For details, see LTE document Idle Mode Mobility Management Feature Parameter Description.

4.2 Measurements on LTE Signal Quality After receiving Radio Bearer Setup, Radio Bearer Reconfiguration, Radio Bearer Release message or inter-frequency hard handover. RNC determines whether LTE measurement is started. RNC start LTE measurement if all the following conditions are met:

All of the following conditions must not be met:

− Some of the UE’s RABs are CS RABs.

− The information element E-UTRAN Service Handover in a certain PS RAB of the UE carries the value "Handover to E-UTRAN shall not be performed."

− The service handover attribute EUTRANSHIND of a certain PS RAB of the UE is set to HO_TO_EUTRAN_SHALL_NOT_BE_PERFORM, which means that this type of service cannot be handed over or redirected to the LTE network.

Where

The information element E-UTRAN Service Handover is optional and specifies which RABs cannot be shifted to the LTE network through a redirection or handover. If one or more of the PS RABs for the UE cannot be shifted to the LTE network, the UE cannot be redirected to the LTE network.

The parameters EUTRANSHIND and TrafficClass in MML ADD UTYPRABBASIC command are used for controlling whether the type of services can be redirected to LTE network. The parameter EUTRANSHIND can be set to HO_TO_EUTRAN_SHOULD_BE_PERFORM or

HO_TO_EUTRAN_SHALL_NOT_BE_PERFORM, and the parameter TrafficClass can be set to CONVERSATIONAL, STREAMING, INTERACTIVE, or BACKGROUND. For example, if the parameter TrafficClass is set to CONVERSATIONAL and the parameter EUTRANSHIND is set to



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UMTS to LTE



4-2

HO_TO_EUTRAN_SHALL_NOT_BE_PERFORM, the conversational services are not allowed to redirect to LTE network.

The neighboring LTE cells are configured for UMTS serving cell

The UE supports both UMTS and LTE.

The UE supports LTE measurements when in connected mode.

The UE supports UMTS-to-LTE PS redirections.

If all these conditions are met and a UMTS-to-PS redirection is allowed, the RNC sends a measurement control command to the UE, instructing the UE to measure the LTE signal quality. Event 3C is triggered when the LTE signal quality satisfies the following formula:

MOtherRAT ≥ TOtherRAT + H3c/2

where,

MOtherRAT is the measured quality of the LTE cell after filtering. The LTEMeasQuanOf3C parameter specifies which of the following is used as the measured quantity of the LTE cell: Reference Signal Received Power (RSRP) or Reference Signal Received Quality (RSRQ). U2LTEFilterCoef is the filter coefficient for the measurement results. A larger value for this parameter results in a greater smoothing effect and higher anti-fading capabilities, but also lower capabilities of tracking signal fluctuations. A smaller value for this parameter results in more unnecessary redirection.

TOtherRAT is the threshold that the LTE signal must reach before a redirection to the LTE network can be performed. The TargetRatThdRSRP or TargetRatThdRSRQ parameter specifies the TOtherRAT value. The TargetRatThdRSRP parameter is the RSRP threshold, and the TargetRatThdRSRQ parameter is the RSRQ parameter. − If the LTEMeasQuanOf3C parameter is set to RSRP, event 3C is reported when the RSRP of the LTE cell has remained greater than or equal to the sum of TargetRatThdRSRP and H3c/2 for a period of time longer than TrigTime3C.

− If the LTEMeasQuanOf3C parameter is set to RSRQ, event 3C is reported when the RSRP of the LTE cell has remained greater than or equal to the sum of TargetRatThdRSRP and H3c/2 for a period of time longer than TrigTime3C.

The TrigTime3C parameter is the hysteresis for the UE triggering event 3C. The value of this parameter relates to slow fading. A larger value for this parameter results in a lower possibility of handovers and unnecessary handovers and a stronger resistance to instantaneous signal fluctuations. An excessively large value for this parameter results in a higher possibility of call drops.

H3c is the hysteresis for reporting event 3C, and it is configured by the Hystfor3C parameter. The value of this parameter relates to slow fading. A larger value for this parameter results in stronger resistance to signal fluctuations. This curbs the ping-pong effect but slows the handover algorithm’s response to signal fluctuations.

These parameters can be configured at the RNC or cell level with the SET UU2LTEHONCOV command or the ADD UCELLU2LTEHONCOV command, respectively. If these parameters are configured at both RNC and cell levels, cell-level settings override RNC-level settings.

4.3 Target Cell Selection and Execution of Redirections The event 3C report from the UE to the RNC carries the LTE cell or cells that meet the conditions for event 3C. If the report carries multiple LTE cells, the one with the best signal quality is selected as the target cell. The RNC shifts the UE to the target cell by using a redirection.

Figure 4-1 shows the procedure for a UMTS-to-LTE PS redirection.















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UMTS to LTE



4-3

Figure 4-1 UMTS-to-LTE PS redirection

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Mobility Between UMTS and LTE 5 Engineering Guidelines



5-1

5 Engineering Guidelines 5.1 Mobility Between UMTS and LTE Phase 1 5.1.1 When to Use Mobility Between UMTS and LTE Phase 1 This feature is required when UEs move back and forth between UMTS and LTE in a UMTS/LTE overlapping coverage area.

5.1.2 Feature Activation To configure the UMTS/LTE bidirectional cell reselection, perform the following steps:

Step 1 Run the ACT LICENSE command on the RNC to activate the license file, and then run the SET License command to modify the license item for this feature.

Step 2 Run the ADD UNODEB command on the RNC to add a NodeB. The NodeB must support 3GPP Release 8 or later.

Step 3 Run the ADD UCELLSIBSWITCH or MOD UCELLSIBSWITCH command, set the parameter SibCfgBitMap to SIB19 on the RNC to enable SIB19 broadcast for the cell.

Step 4 Run the ADD UCELLSELRESEL or MOD UCELLSELRESEL command on the RNC to configure the absolute priority and cell reselection parameters for the serving cell. The following table lists the related parameters.

Parameter ID Command

SPriority ADD CELLSELRESEL or MOD CELLSELRESEL

ThdPrioritySearch1 ADD CELLSELRESEL or MOD CELLSELRESEL

ThdPrioritySearch2 ADD CELLSELRESEL or MOD CELLSELRESEL

ThdServingLow ADD CELLSELRESEL or MOD CELLSELRESEL

Step 5 Run the ADD UCELLNFREQPRIOINFO or MOD UCELLNFREQPRIOINFO command on the RNC to configure the E-UTRA absolute radio frequency channel numbers (EARFCNs) and cell reselection parameters for neighboring LTE cells. The absolute priority of each EARFCN for a neighboring LTE cell must be different from that for the serving UMTS cell. The following table lists the related parameters.


NPriority ADD CELLNFREQPRIOINFO or MOD CELLNFREQPRIOINFO

ThdToHigh ADD CELLNFREQPRIOINFO or MOD CELLNFREQPRIOINFO


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5-2


ThdToLow ADD CELLNFREQPRIOINFO or MOD CELLNFREQPRIOINFO

EARFCN ADD CELLNFREQPRIOINFO or MOD CELLNFREQPRIOINFO

EMeasBW ADD CELLNFREQPRIOINFO or MOD CELLNFREQPRIOINFO

EQrxlevmin ADD CELLNFREQPRIOINFO or MOD CELLNFREQPRIOINFO

EDetectInd ADD CELLNFREQPRIOINFO or MOD CELLNFREQPRIOINFO

BlacklstCellNumber ADD CELLNFREQPRIOINFO or MOD CELLNFREQPRIOINFO

5.1.3 Activation Observation Start Uu interface message tracing on the RNC LMT. If the message trace indicates that the RNC has sent SIB19, this feature has been activated.

To check for SIB19 on the Uu interface, perform the following steps:

Step 1 Start Uu interface message tracing in the navigation tree of the LMT.

Step 2 If SIB19 can be traced on the Uu interface, this feature has been activated. Otherwise, check the data configured in the steps for feature activation. Then, try again.

5.2 Service-based PS Redirection from UMTS to LTE 5.2.1 When to Use Service-based PS Redirection from UMTS to LTE This feature is recommended in UMTS/LTE overlapping coverage areas. Determine whether to enable the UMTS-to-LTE PS redirection based on the UE capabilities in the live network..

If UEs preferentially camp on the UMTS network, this feature must be used. Otherwise, UEs can camp on the LTE network by cell reselection only in weak UMTS coverage areas, which leads to an idle LTE network.

5.2.2 Deployment Requirements The SGSN can send the RNC a RAB Assignment Request message containing the E-UTRAN Service

Handover IE.

UEs in connected mode support measuring the LTE signal quality.

5.2.3 Feature Activation The activation procedure is as follows:

Step 1 Activate the corresponding license.

Step 2 Set the corresponding parameters.

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To turn on the general switch for the UMTS-to-LTE PS redirection, run the following command:

SET UCORRMALGOSWITCH: HoSwitch= HO_LTE_PS_OUT_SWITCH-1

To turn on the switch for the service-based UMTS-to-LTE PS redirection, run the following command:

SET UCORRMALGOSWITCH: HoSwitch= HO_LTE_SERVICE_PS_OUT_SWITCH-1.

Step 3 Set the basic parameters of an LTE cell.

To add an LTE cell and specify its basic information, run the ADD ULTECELL command. The following is an example:

ADD ULTECELL: LTECellIndex=1, LTECellName="LTECELL1", EUTRANCELLID=100, MCC="460", MNC="01", TAC=10, CnOpGrpIndex=1, CellPHYID=100, LTEBand=10, LTEArfcn=500, SuppPSHOFlag=NotSupport;

To modify the LTE cell attributes, run the MOD ULTECELL command. The following is an example:

MOD ULTECELL: LTECellIndex=1, TAC=9;

To remove the LTE cell, run the RMV ULTECELL command. The following is an example:

RMV ULTECELL: LTECellIndex=1;

The key parameters are as follows:

− EUTRANCELLID: the LTE cell identity, which uniquely identifies an LTE cell in a PLMN. For macro base stations, EUTRANCELLID consists of a 20-bit eNodeBID and an 8-bit CellID. For micro base stations, EUTRANCELLID is a 28-bit eNodeBID. The parameter setting depends on the network plan.

− TAC: the tracing area code of the LTE cell. In principle, eNodeBs within a certain area are managed by the MME in charge of this area. The tracing area code specified for an LTE cell must be within the TAC range configured on the MME.

Step 4 Set the parameters of neighboring LTE cells.

To configure a neighboring LTE cell with a cell index of 1 for a UMTS cell whose RNC ID is 1 and UMTS cell ID is 2, run the following command:

ADD ULTENCELL: RNCId=1, CellId=2, LTECellIndex=1;

To remove a neighboring LTE cell with a cell index of 1 from a UMTS cell whose RNC ID is 1 and UMTS cell ID is 2, run the following command:

RMV ULTENCELL: RNCId=1, CellId=2, LTECellIndex=1;

Step 5 To set the RNC-level non-coverage-based UMTS-to-LTE redirection measurement parameters, run the SET UU2LTEHONCOV command. The following is an example:

SET UU2LTEHONCOV: LTEMeasTypOf3C=MeasurementQuantity, U2LTEFilterCoef=D6, U2LTEMeasTime=30, LTEMeasQuanOf3C=RSRP, Hystfor3C=2, TrigTime3C=D10, TargetRatThdRSRP=20, TargetRatThdRSRQ=30;

Step 6 Set the cell-level non-coverage-based UMTS-to-LTE redirection measurement parameters.

To add the cell-level non-coverage-based UMTS-to-LTE redirection measurement parameters, run the ADD UCELLU2LTEHONCOV command. The following is an example:

ADD UCELLU2LTEHONCOV: CellId=1, LTEMeasTypOf3C=MeasurementQuantity, U2LTEFilterCoef=D6, U2LTEMeasTime=30, LTEMeasQuanOf3C=RSRP, Hystfor3C=2, TrigTime3C=D10, TargetRatThdRSRP=20, TargetRatThdRSRQ=30;

To modify the cell-level non-coverage-based UMTS-to-LTE redirection measurement parameters, run the MOD UCELLU2LTEHONCOV command. The following is an example:

MOD UCELLU2LTEHONCOV: CellId=1, U2LTEFilterCoef=D0;

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5-4

To remove the cell-level non-coverage-based UMTS-to-LTE redirection measurement parameters, run the RMV UCELLU2LTEHONCOV command. The following is an example:

RMV UCELLU2LTEHONCOV: CellId=1;

If the cell-level redirection measurement parameters are configured, UEs access the cell by using these parameters. If no cell-level redirection measurement parameters are configured, UEs access the cell by using the RNC-level redirection measurement parameters.

Step 7 Run the ADD UTYPRABBASIC command and set the TrafficClass and EUTRANSHIND parameter for service handover attributes.

For example: run the ADD UTYPRABBASIC command with TrafficClass set to interactive and EUTRANSHIND set to HO_TO_EUTRAN_SHALL_NOT_BE_PERFORM, UEs processing interactive services cannot be redirected to the LTE network.

5.2.4 Activation Observation After the preceding parameters are set, verify that a redirection procedure is executed as expected..

5.2.5 Performance Optimization Monitoring The added counter involved in the feature WRFD-020129 PS Service Redirection from UMTS to LTE is as follows:

Counter Measurement Object

Measurement Unit

Description

VS.U2LTEHO.RRCRelease.Service

CELL U2LTE.HO.CELL Number of service-based redirections to LTE through RRC connection release for a cell





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Mobility Between UMTS and LTE 6 Parameters



6-1

6 Parameters Table 6-1 Parameter description

Parameter ID NE MML Command Description

EUTRANCELLID

BSC6900 ADD ULTECELL(Mandatory)

MOD ULTECELL(Optional)

Meaning: This parameter is used to uniquely identify an LTE cell in the PLMN. For macro base stations, EutranCellId consists of eNodeBID of 20 bits and CellID of 8 bits. For micro base stations, EutranCellId is set to the eNodeBID value of 28 bits. For details about the parameter description, see 3GPP TS 25.413.

GUI Value Range: 0~268435455

Actual Value Range: 0~268435455

Unit: None

Default Value: None

EUTRANSHIND BSC6900 ADD UTYPRABBASIC(Optional)

MOD UTYPRABBASIC(Optional)

Meaning: This parameter specifies whether to allow the service-based handover of UEs from UMTS to LTE.

GUI Value Range: HO_TO_EUTRAN_SHOULD_BE_PERFORM, HO_TO_EUTRAN_SHALL_NOT_BE_PERFORM

Actual Value Range: HO_TO_EUTRAN_SHOULD_BE_PERFORM, HO_TO_EUTRAN_SHALL_NOT_BE_PERFORM

Unit: None

Default Value: HO_TO_EUTRAN_SHALL_NOT_BE_PERFORM

Hystfor3C BSC6900 ADD UCELLU2LTEHONCOV(Optional)

MOD UCELLU2LTEHONCOV(Optional)

Meaning: This parameter specifies the hysteresis for a UE to report event 3C. For detailed description of the parameter, see 3GPP TS 25.331.


Actual Value Range: 0~7.5

Unit: 0.5dB

Default Value: 4

LTEMeasQuanOf3C

BSC6900 ADD UCELLU2LTEHONCOV(Optional)


Meaning: This parameter specifies the measurement quantity of a handover target LTE system in an event 3C measurement report sent by a UE during a handover that is not based on coverage. This parameter can be set to RSRP or RSRQ. Note that what specific measurement results are reported depends on the setting of "Report Type of LTE Measurement", as is specified in 3GPP TS 25.331.



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Parameter ID NE MML Command Description RSRP is the average power of signals received on all resource elements (REs) that carry reference signals within a certain symbol.

RSRQ is defined as the ratio of RSRP to RSSI (RSRQ = N*RSRP/RSSI). The coefficient N is introduced to adjust possible bandwidth difference in both types of measurement.

GUI Value Range: RSRP(Reference Signal Receiving Power), RSRQ(Reference Signal Receiving Quality)

Actual Value Range: RSRP, RSRQ

Unit: None

Default Value: RSRP

LTEMeasTypOf3C



Meaning: This parameter specifies the type of measurement result that a UE needs to carry in an event-triggered or periodical measurement report. When this parameter is set to Measurementquantity, the parameter value is the same as that of "Measurement Quantity for Event 3C Measurement of LTE". When this parameter is set to Both, the UE needs to report measurement results of both the types: Reference Signal Received Power (RSRP) and Reference Signal Receiving Quality (RSRQ).

GUI Value Range: MeasurementQuantity(MeasurementQuantity), Both(Both)

Actual Value Range: MeasurementQuantity, Both

Unit: None

Default Value: MeasurementQuantity

NPriority BSC6900 ADD UCELLNFREQPRIOINFO(Mandatory)

MOD UCELLNFREQPRIOINFO(Optional)

Meaning: This parameter specifies the absolute priority level of the E-UTRA frequency. The UE compares the value of this parameter with the absolute priority level of the serving cell, and specifies the target frequency based on the comparison result. That is, when the value of this parameter is greater than the priority level of the serving cell, the UE measures the neighboring frequency. If the signal of cells on the neighboring frequency satisfies relevant requirements, the UE initiates the cell reselection. When the value of this parameter is smaller than the priority level of the serving cell, the UE measures the neighboring frequency only when the signal of the serving cell is weak. If the signal of cells on the neighboring frequency satisfies relevant requirements, the UE initiates the cell reselection. The value of this parameter









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Parameter ID NE MML Command Description is set during network planning. The greater the value of this parameter is, the easier the UE reselects a cell on this frequency, the smaller the value of this parameter is, the harder the UE reselects a cell on this frequency. For details on this parameter, see 3GPP TS 25.304.



Unit: None

Default Value: None

Qqualmin BSC6900 ADD UCELLSELRESEL(Optional)

MOD UCELLSELRESEL(Optional)

Meaning: The minimum required quality threshold corresponding to CPICH Ec/No. The UE can camp on the cell only when the measured CPICH Ec/No is greater than the value of this parameter. The higher the parameter value is, the more difficult it is for the UE to reside in the cell. The lower parameter value is, the easier it is for the UE to reside in the cell, but it is possible that the UE cannot receive the system messages that are sent through the PCCPCH. For detailed information, refer to the 3GPP TS 25.304.

GUI Value Range: -24~0

Actual Value Range: -24~0

Unit: dB

Default Value: -18

Qrxlevmin BSC6900 ADD UCELLSELRESEL(Optional)


Meaning: The minimum required RX threshold corresponding to CPICH RSCP. The UE can camp on the cell only when the measured CPICH RSCP is greater than the value of this parameter. The setting of Qrxlevmin should be related to Qqualmin. The higher the parameter is, the more difficult it is for the UE to reside in the cell. The lower parameter is, the easier it is for the UE to reside in the cell, but it is possible that the UE cannot receive the system messages that are sent through the PCCPCH. For detailed information, refer to 3GPP TS 25.331 10.3.2.3.

GUI Value Range: -58~-13

Actual Value Range: -115~-25

Unit: 2dBm

Default Value: -58

SPriority BSC6900 ADD UCELLSELRESEL(Optional)

MOD

Meaning: This parameter indicates the absolute priority level of the serving cell when the UE performs cell reselection.

The UE compares the absolute priority level of

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Parameter ID NE MML Command Description UCELLSELRESEL(Optional)

the serving cell with that of neighboring frequencies, and specifies the target frequency based on the comparison result.

That is, when the priority level of the serving cell is smaller than that of the neighboring frequency, the UE measures the neighboring frequency. If the signal of cells on the neighboring frequency satisfies relevant requirements, the UE initiates the cell reselection.

When the priority level of the serving cell is greater than that of the neighboring frequency, the UE measures the neighboring frequency only when the signal of the serving cell is weak. If the signal of cells on the neighboring frequency satisfies relevant requirements, the UE initiates the cell reselection.

The value of this parameter is set during network planning.

The greater the absolute priority level of the serving cell is, the harder the UE performs cell reselection, the smaller the absolute priority level of the serving cell is, the easier the UE performs cell reselection.

For details on this parameter, see 3GPP TS 25.304.



Unit: None

Default Value: 4

SibCfgBitMap BSC6900 ADD UCELLSIBSWITCH(Optional)

MOD UCELLSIBSWITCH(Optional)

Meaning: Determine whether some system information blocks are broadcast in this cell. If the corresponding system information block is selected, then send this system information block in this cell.

GUI Value Range: SIB2, SIB4, SIB12, SIB18, SIB19, SIB11BIS

Actual Value Range: SIB2, SIB4, SIB12, SIB18, SIB19, SIB11BIS

Unit: None

Default Value: None

TAC BSC6900 ADD ULTECELL(Mandatory)

MOD ULTECELL(Optional)

Meaning: This parameter specifies Tracking Area Code (TAC) of a cell. In principle, base stations in a certain area are managed by an MME in specialized charge of the area. The TAC of each cell under these base stations is recorded in the MME. "TAC" in this area should be configured within the value range.


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Parameter ID NE MML Command Description GUI Value Range: 0~65535


Unit: None

Default Value: None

TargetRatThdRSRP



Meaning: This parameter specifies the RSRP threshold in the event 3C measurement of LTE during a handover that is not based on coverage. If the measurement quantity of event 3C is RSRP, event 3C can be triggered only when signal quality in a target LTE cell is higher than the threshold. For detailed description of the parameter, see 3GPP TS 25.331.


Actual Value Range: -140~-44(Actual value meets the condition: Actual Value = GUI Value - 141)

Unit: dBm

Default Value: 36

TargetRatThdRSRQ



Meaning: This parameter specifies the RSRQ threshold in the event 3C measurement of LTE during a handover that is not based on coverage. If the measurement quantity of event 3C is RSRQ, event 3C can be triggered only when signal quality in a target LTE cell is higher than the threshold. For detailed description of the parameter, see 3GPP TS 25.331.


Actual Value Range: -19.5~-3(Actual value meets the condition: Actual Value = GUI Value*0.5 - 20)

Unit: dB

Default Value: 20

ThdPrioritySearch1

BSC6900 ADD UCELLSELRESEL(Optional)


Meaning: This parameter specifies the minimum CPICH RSCP value that triggers the UE to measure cells on low-priority frequencies.

That is, subtract the minimum CPICH RSCP from the CPICH RSCP of the serving cell. If the obtained number is no greater than the value of this parameter, UE measures cells on low-priority frequencies.

The greater the value of this parameter is, the easier the UE measures cells for priority-based cell reselection, the smaller the value of this parameter is, the harder the UE measures cells for priority-based cell reselection.

For details on this parameter, see 3GPP TS

























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Parameter ID NE MML Command Description 25.304.



Unit: 2dB

Default Value: 2

ThdPrioritySearch2

BSC6900 ADD UCELLSELRESEL(Optional)


Meaning: This parameter specifies the minimum CPICH Ec/No value that triggers the UE to measure cells on low-priority frequencies. That is, subtract the minimum CPICH Ec/No from the CPICH Ec/No value of the serving cell. If the obtained number is no greater than the value of this parameter, UE measures cells on low-priority frequencies. The greater the value of this parameter is, the easier the UE measures cells for priority-based cell reselection, the smaller the value of this parameter is, the harder the UE measures cells for priority-based cell reselection. For details on this parameter, see 3GPP TS 25.304.


Actual Value Range: {0~7}

Unit: dB

Default Value: 2

ThdServingLow BSC6900 ADD UCELLSELRESEL(Optional)


Meaning: This parameter specifies the CPICH RSCP value of the serving cell below which the UE initiates cell reselection to a cell on the frequency with lower priority level.

The UE measures cells on the target frequency for cell reselection. Within the interval defined by Treselections, if the CPICH RSCP of the serving cell is smaller than the value of this parameter whereas the CPICH RSCP of the cell on the low-priority frequency is high, the UE performs cell reselection.

The greater the value of this parameter is, the easier the UE performs priority-based cell reselection, the smaller the value of this parameter is, the harder the UE performs priority-based cell reselection.

For details on this parameter, see 3GPP TS 25.304.


Actual Value Range: {0~62}

Unit: 2dB

Default Value: 1

ThdToHigh BSC6900 ADD Meaning: This parameter specifies the RSRP









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Parameter ID NE MML Command Description UCELLNFREQPRIOINFO(Optional)


above which the UE performs cell reselection from the serving cell to a cell on the target frequency when the absolute priority level of the target frequency is greater than that of the serving cell. The UE measures cells on the target frequency for cell reselection. Within the interval defined by Treselections, if the RSRP of the cell on the target frequency is greater than the value of this parameter, the UE performs cell reselection. The value of this parameter is set during network planning. The greater the value of this parameter is, the harder the UE reselects a cell on the target frequency, the smaller the value of this parameter is, the easier the UE reselects a cell on the target frequency. For details on this parameter, see 3GPP TS 25.304.



Unit: 2dB

Default Value: 2

ThdToLow BSC6900 ADD UCELLNFREQPRIOINFO(Optional)


Meaning: This parameter specifies the RSRP above which the UE performs cell reselection from the serving cell to a cell on the target frequency when the absolute priority level of the target frequency is smaller than that of the serving cell. The UE measures cells on the target frequency for cell reselection. Within the interval defined by Treselections, if the RSCP of the serving cell is smaller than the parameter of RSCP threshold of low-prio-freq reselection, whereas the RSRP of the cell on the target frequency is greater than the value of this parameter, the UE performs cell reselection. The value of this parameter is set during network planning. The greater the value of this parameter is, the harder the UE reselects a cell on the target frequency, the smaller the value of this parameter is, the easier the UE reselects a cell on the target frequency. For details on this parameter, see 3GPP TS 25.304.



Unit: 2dB

Default Value: 2

TrafficClass BSC6900 ADD UTYPRABBASIC(Mandatory)

Meaning: Traffic class. According to the QoS requirements of services, there are four traffic classes: conversational, streaming, interactive, and background.

GUI Value Range: CONVERSATIONAL,




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6-8

Parameter ID NE MML Command Description STREAMING, INTERACTIVE, BACKGROUND

Actual Value Range: CONVERSATIONAL, STREAMING, INTERACTIVE, BACKGROUND

Unit: None

Default Value: None

Treselections BSC6900 ADD UCELLSELRESEL(Optional)


Meaning: If the signal quality (CPICH Ec/No measured by the UE) of a neighboring cell is better than that of the serving cell during the specified time of this parameter, the UE reselects the neighboring cell. It is used to avoid ping-pong reselection between different cells. Note that the value 0 corresponds to the default value defined in the protocol.

Set the parameter as follows:

1. Ensure that the UE can reselect a cell when crossing the non-soft-switch area of the cell and that the UE timely performs location updates, cell updates, or URA updates when necessary.

2. Ensure that the UE does not reselect a cell when it is in the soft-switch area of the cell. In this way, the unnecessary location updates, cell updates, and URA updates are avoided.

3. Consider the difference between cells that cover different areas, for example the cells covering highways and cells covering densely populated areas. TIf the parameter is set to a comparatively low value, the ping-pong reselections may be caused. The parameter can be increased in populated area and reduced in high-speed movement. If the parameter is set to a comparatively high value, the cell reselection delay may become excessively high, and thus cell reselections may be affected.

For detailed information, refer to 3GPP TS 25.304.



Unit: s

Default Value: 1

TrigTime3C BSC6900 ADD UCELLU2LTEHONCOV(Optional)


Meaning: This parameter specifies the interval time between detection of event 3C and sending of the measurement report. How to set this parameter is related to slow fading. For detailed description of the parameter, see 3GPP TS 25.331.

GUI Value Range: D0, D10, D20, D40, D60, D80, D100, D120, D160, D200, D240, D320,

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6-9

Parameter ID NE MML Command Description D640, D1280, D2560, D5000

Actual Value Range: 0, 10, 20, 40, 60, 80, 100, 120, 160, 200, 240, 320, 640, 1280, 2560, 5000

Unit: ms

Default Value: D0

U2LTEFilterCoef



Meaning: This parameter specifies the layer 3 filter coefficient for the LTE measurement. Layer 3 filter coefficient is sent to the UE and the UE performs filtering of the measurements according to the following formula: Fn=(1-a)*Fn-1 + a*Mn

The variables in the formula are defined as follows: a=1/(2^(k/2)), where k is this parameter. Fn-1 is the old filtered measurement result. Mn is the latest received measurement result from physical layer measurements. Fn is the updated filtered measurement result. For detailed description of the parameter, see 3GPP TS 25.331.

GUI Value Range: D0, D1, D2, D3, D4, D5, D6, D7, D8, D9, D11, D13, D15, D17, D19

Actual Value Range: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 13, 15, 17, 19

Unit: None

Default Value: D3

U2LTEMeasTime



Meaning: This parameter specifies the duration of the timer that is used in LTE measurement. If the LTE measurement timer reaches the duration in an LTE measurement and the handover to LTE is still not performed, the LTE measurement is stopped. If the compressed mode is started and the timer expires, the compressed mode is stopped. If this parameter is set to 0, it indicates that the LTE measurement timer is not started.



Unit: s

Default Value: 30

















WCDMA RAN

Mobility Between UMTS and LTE 7 Counters



7-1

7 Counters Table 7-1 Counter description

Counter ID Counter Name Counter Description Feature ID Feature Name

73423386 VS.U2LTEHO.AttOutPS.Service

Number of Service-Based UMTS-to-LTE PS Handover Attempts for Cell

WRFD-020126 Mobility Between UMTS and LTE Phase 1

73423387 VS.U2LTEHO.SuccOutPS.Service

Number of Successful Service-Based UMTS-to-LTE PS Handovers for Cell


73423408 VS.U2LTEHO.FailOutPS.NoReply

Number of Failed UMTS-to-LTE PS Handovers Due to Iu Release Command Timeout for Cell


73423409 VS.U2LTEHO.FailOutPS.CfgUnSupp

Number of Failed UMTS-to-LTE PS Handovers for Cell (Configuration Unsupported)


73423410 VS.U2LTEHO.FailOutPS.PhyChFail

Number of Failed UMTS-to-LTE PS Handovers for Cell (Physical Channel Failure)


73423411 VS.U2LTEHO.FailOutPS.Abort

Number of Abnormally Terminated Outgoing UMTS-to-LTE PS Handovers for Cell


73423412 VS.U2LTEHO.AttRelocPrepOutPS

Number of Outgoing UMTS-to-LTE PS Handover Preparation Attempts for Cell


73423413 VS.U2LTEHO.SuccRelocPrepOutPS

Number of Successful Preparations for Outgoing UMTS-to-LTE PS Handovers for Cell


73423414 VS.U2LTEHO.FailRelocPrepOutPS.NoResAvail

Number of Failed Preparations for Outgoing UMTS-to-LTE PS Handovers for Cell (No Resource Available)


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Mobility Between UMTS and LTE 7 Counters



7-2

Counter ID Counter Name Counter Description Feature ID Feature Name

73423415 VS.U2LTEHO.FailRelocPrepOutPS.TgtFail

Number of Failed Preparations for Outgoing UMTS-to-LTE PS Handovers for Cell (Relocation Failure in Target CN/RNC or Target System)


73423416 VS.U2LTEHO.FailRelocPrepOutPS.ReloUnSupp

Number of Failed Preparations for Outgoing UMTS-to-LTE PS Handovers for Cell (Relocation not supported in Target RNC or Target system)


73423417 VS.U2LTEHO.FailRelocPrepOutPS.TgtHighLoad

Number of Failed Preparations for Outgoing UMTS-to-LTE PS Handovers for Cell (Traffic Load In The Target Cell Higher Than In The Source Cell)


73423418 VS.U2LTEHO.FailRelocPrepOutPS.UnKnowRNC

Number of Failed Preparations for Outgoing UMTS-to-LTE PS Handovers for Cell (Unknown Target RNC)


73423419 VS.U2LTEHO.RRCRelease.Service

Number of Service-Based Redirection to LTE Through RRC Connection Release for Cell

WRFD-020129 PS Service Redirection from UMTS to LTE

73423420 VS.U2LTEHO.FailRelocPrepOutPS.TAlExp

Number of Failed Preparations for Outgoing UMTS-to-LTE PS Handovers for Cell (TRELOCalloc expiry)








WCDMA RAN

Mobility Between UMTS and LTE 8 Glossary



8-1

8 Glossary For the acronyms, abbreviations, terms, and definitions, see the Glossary.

Glossary.htm

WCDMA RAN

Mobility Between UMTS and LTE 9 Reference Documents



9-1

9 Reference Documents [1] 3GPP TS25.331: Radio Resource Control (RRC)

[2] 3GPP TS25.304: User Equipment (UE) procedures in idle mode and procedures for cell reselection in connected mode

[3] 3GPP TS23.216: Single Radio Voice Call Continuity (SRVCC)

[4] UE Behaviors in Idle Feature Parameter Description

UE%20Behaviors%20in%20Idle.htm