mobility between umts and lte

Huawei Proprietary and Confidential

Copyright © Huawei Technologies Co., Ltd

WCDMA RAN

Mobility Between UMTS and LTE Feature Parameter Description

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.

Trademarks and Permissions

and other Huawei trademarks are the property of Huawei Technologies Co., Ltd. All other trademarks and trade names mentioned in this document are the property of their respective holders.

Notice

The purchased products, services and features are stipulated by the commercial contract made between Huawei and the customer. All or partial products, services and features described in this document may not be within the purchased scope or the usage scope. Unless otherwise agreed by the contract, all statements, information, and recommendations in this document are provided "AS IS" without warranties, guarantees or representations of any kind, either express or implied.

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 recommendations in this document do not constitute a warranty of any kind, express or implied.

WCDMA RAN

Mobility Between UMTS and LTE Contents

Issue 01 (2011-04-30) Huawei Proprietary and Confidential


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 Selection and Reselection ............................................................................................. 3-1

3.1 Overview ....................................................................................................................................... 3-1

3.2 Cell Reselection Procedure ........................................................................................................... 3-1

3.3 Measurement Criteria .................................................................................................................... 3-1

3.4 Cell Reselection Criteria ................................................................................................................ 3-1

3.5 System Information Block Type 19 ................................................................................................ 3-2

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

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

4.2 Triggering ...................................................................................................................................... 4-1

4.3 Measurement ................................................................................................................................ 4-2

4.4 Decision and Execution ................................................................................................................. 4-2

5 Engineering Guidelines ........................................................................................................... 5-3

5.1 Typical Scenarios .......................................................................................................................... 5-3

5.2 Main Factors Affecting This Feature ............................................................................................. 5-3

5.3 Suggestions for Deploying This Feature ....................................................................................... 5-3

5.4 Performance Monitoring ................................................................................................................ 5-3

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

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

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

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

WCDMA RAN

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:

01 (2011-04-30)

Draft B (2011-03-30)

Draft A (2010-12-30)

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:

WCDMA RAN

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

SuppPSHOFlag

U2LTEFilterCoef

TargetRatThdRSRP

TargetRatThdRSRQ

Hystfor3C

Editorial change None. None.

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Mobility Between UMTS and LTE 2 Overview



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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, improves the quality of service (QoS), 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)

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

RAN13.0 supports:

PS service redirection from UMTS to LTE

WCDMA RAN

Mobility Between UMTS and LTE 3 Cell Selection and Reselection



3-1

3 Cell Selection and Reselection

3.1 Overview

When a UE is powered on, it initially selects a public land mobile network (PLMN) based on the radio access technology (RAT) priorities of PLMNs stored in its SIM card.

If the UE receives system information block type 19 (SIB19) from a UMTS network, it selects a PLMN based on the RAT priorities of PLMNs included in SIB19. Otherwise, it remains in the current PLMN.

In the UMTS network, SIB19 includes the absolute priority of the serving cell and the absolute priority of each LTE frequency. When an LTE frequency has a higher absolute priority than the serving cell, the UE reselects an LTE cell on this frequency if other conditions for LTE cell reselection are also met. When the absolute priority of each LTE frequency is lower than that of the serving cell, the UE reselects another UMTS cell if other conditions for UMTS cell reselection are also met.

In the LTE network, SIB3 includes the absolute priority of the serving cell, SIB5 includes the absolute priority of each LTE frequency, and SIB6 includes the absolute priority of each UMTS frequency. Based on these priorities, a UE can determine whether to select/reselect a UMTS cell or an LTE cell.

3.2 Cell Reselection Procedure

Based on signal quality of neighboring cells, the UE determines whether to reselect a neighboring cell. For details about the cell reselection procedure, see the UE Behaviors in Idle Feature Parameter Description.

3.3 Measurement Criteria

The design of radio resource management (RRM) is closely related to the measurement procedure and measurement results.

If the absolute priorities of LTE frequencies are configured for the serving cell, these priorities must be different from the absolute priority of the serving cell. In this case, the criteria for triggering inter-RAT measurement are as follows:

If some neighboring LTE cells have higher absolute priorities than the serving cell, the UE measures these LTE cells.

If some neighboring LTE cells have lower absolute priorities than the serving cell, the UE measures these LTE cells under the condition SrxlevServingCell <= Sprioritysearch1 or SqualServingCell <= Sprioritysearch2.

Sprioritysearch1 and Sprioritysearch2 are determined by the ThdPrioritySearch1 and ThdPrioritySearch2 parameters, respectively. These two parameters can be set by using the ADD UCELLSELRESEL or MOD UCELLSELRESEL command on an RNC LMT.

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

For neighboring UMTS cells and GSM cells, the criteria for inter-RAT measurement are the same as those associated with the hierarchical cell structure (HCS), which are described in the UE Behaviors in Idle Feature Parameter Description.

3.4 Cell Reselection Criteria

After the UE completes the measurement of the serving cell and neighboring cells, the UE reselects the best available cell to camp on.

For cell reselection between UMTS and GSM, the UE uses the H criteria or R criteria. For details about the H criteria and R criteria, see the UE Behaviors in Idle Feature Parameter Description.

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WCDMA RAN

Mobility Between UMTS and LTE 3 Cell Selection and Reselection



3-2

For cell reselection between UMTS and LTE, the UE uses the cell reselection criteria based on absolute priorities.

If the absolute priorities of LTE frequencies are configured for the serving cell, the UE reselects a neighboring LTE cell if one of the following conditions is met:

Condition 1:

− This cell has a higher absolute priority than the serving cell.

− SrxlevnonServingCell is greater than Threshhigh, and the duration exceeds Treselection.

Condition 2:

− This cell has a lower absolute priority than the serving cell.

− SrxlevnonServingCell is greater than Threshlow, and the duration exceeds Treselection.

− SrxlevServingCell is less than or equal to Sprioritysearch1 or SqualServingCell is less than or equal to Sprioritysearch2, and the duration exceeds Treselection.

If there are multiple cells meeting these conditions, the UE reselects the cell with the highest absolute priority. If there are multiple cells with the same highest absolute priority, the UE reselects the cell with the highest SrxlevnonServingCell.

Sprioritysearch1 and Sprioritysearch2 are determined by the ThdPrioritySearch1 and ThdPrioritySearch2 parameters, respectively. These two parameters can be set by using the ADD UCELLSELRESEL or MOD UCELLSELRESEL command on an RNC LMT.

Threshhigh, Threshlow, and Treselection are specified by the ThdToHigh, ThdToLow, and Treselections parameters, respectively. These parameters can be set by using the ADD CELLNFREQPRIOINFO command on the RNC LMT.

For each UMTS cell, the absolute priorities of a maximum of eight LTE frequencies can be configured.

3.5 System Information Block Type 19

To access a cell, the UE needs to know the configuration information about the cell. The UE obtains this type of information by reading the system information that is broadcast in the cell. The system information is sent by the UTRAN to the UE through the master information block (MIB) and system information blocks (SIBs). For detailed information about SIBs, see 3GPP TS 25.331.

To enable cell reselection from UMTS to LTE, the UTRAN must send a neighboring LTE cell list and reselection parameters to the UE. Based on the information, the UE can perform neighboring cell measurement and reselection.

In the UTRAN, the LTE frequencies and their absolute priorities are indicated in SIB19. Therefore, to support cell reselection from UMTS to LTE, the RNC must support SIB19.

The UE determines whether to reselect a UMTS cell or an LTE cell based on the following criteria:

If an LTE frequency has a higher absolute priority than the serving cell, the UE reselects the LTE cell if other conditions for LTE cell reselection are also met.

If the broadcasting of SIB19 is disabled or each LTE frequency has a lower absolute priority than the serving cell, the UE reselects another UMTS cell according to the H criteria or R criteria.

Enabling or disabling SIB19 broadcasting is controlled by the SibCfgBitMap parameter, which can be set by using the MOD UCELLSIBSWITCH command on the RNC LMT.



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WCDMA RAN

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 section describes the feature WRFD-020129 Service-Based PS Service Redirection from UMTS to LTE (trial).

If a UMTS/LTE dual-mode UE establishes only PS services in UMTS under the hybrid macro coverage of UMTS and LTE, the RNC can redirect the UE to the LTE network.

This feature provides a substitute for PS handover from UMTS to LTE, if the UE or network does not support the PS handover from UMTS to LTE at the initial stage of UMTS and LTE hybrid network deployment. With this feature, PS services can be redirected from UMTS to LTE to improve user experience.

The RNC can redirect a UE from UTMS to LTE, if the following conditions are met:

The UE reports its capability to the RNC that the UE supports both UMTS and LTE.

After service setup or service modification, the UE is processing only PS services and all its PS services are allowed to be established in LTE (the RAB assignment message from the CN does not contain a restriction against PS handover to LTE).

The conditions of PS handover from UMTS to LTE are met but the UE or network does not support the PS handover from UMTS to LTE.

If the network does not support the PS handover, run the ADD ULTECELL command and set the SuppPSHOFlag parameter to disable the PS handover on the Iu interface to avoid unnecessary signaling procedures.

If the preceding conditions are met, the RNC sends a measurement control message to the UE and instructs the UE to measure the signal quality of neighboring LTE cells. If the signal quality of neighboring LTE cells is desirable, the UE reports event 3C to the RNC. The RNC sends the UE an RRC CONNECTION RELEASE message, instructing the UE to be redirected to LTE. This message also carries the information about the LTE frequency.

4.2 Triggering

The requirements for triggering PS service redirection from UMTS to LTE are as follows:

The HO_LTE_PS_OUT_SWITCH check box in the HoSwitch parameter is selected.

The HO_LTE_SERVICE_PS_OUT_SWITCH check box in the HoSwitch parameter is selected.

The UE supports LTE and is capable of being redirected from UMTS to LTE.

After Radio Access Bearer (RAB) setup, modification, release, and relocation, the RNC checks whether the information element (IE) E-UTRAN Service Handover is contained in the remaining RABs. As indicated in 3GPP TS 25.413-930, the E-UTRAN Service Handover IE has only one option HO_TO_E-UTRAN_SHALL_NOT_BE_PERFORM, which indicates that the RAB cannot be redirected from UMTS to LTE.

− If the RNC receives an E-UTRAN Service Handover IE from the CN for a given RAB, the RNC does not trigger the measurement of LTE signals.

− If the RNC does not receive any E-UTRAN Service Handover IE from the CN for a given RAB, the RNC triggers the measurement of LTE signals if the EUTRANSHIND parameter is set to HO_TO_EUTRAN_SHOULD_BE_PERFORM.

− If none of the remaining RABs contains a restriction against service handover to LTE, the RNC triggers the measurement of LTE signals.


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WCDMA RAN

Mobility Between UMTS and LTE

4 Service-Based PS Service Redirection from

UMTS to LTE



4-2

4.3 Measurement

The RNC sends a measurement control command to the UE to initiate the measurement of LTE signals. Only event 3C is involved in the measurement control process of service redirection.

The following table describes the details of the measurement.

Item Description

Measurement quantity

The measurement quantity is reference signal receiving power (RSRP) or reference signal receiving quality (RSRQ).

If LTEMeasTypOf3C is set to BOTH, the measure quantities are both of RSRP and RSRQ.

If LTEMeasTypOf3C is set to Measurement quantity, the LTEMeasQuanOf3C parameter specifies the measure quantity.

Report mode Only the report of event 3C is supported.

When the conditions for reporting event 3C are met for a period specified by the TrigTime3C parameter, the UE sends a measurement report of event 3C.

Measurement time

The radio network performance is affected if the UE implements the measurement in compressed mode for a long period of time. To prevent this impact, the RNC stops the measurement and deactivates the compressed mode to stop the service redirection, if no redirection decision is made upon the expiration of the timer U2LTEMeasTime.

Neighboring cell list

A maximum of 32 neighboring LTE cells can be configured by using the ADD ULTECELL command.

The SuppPSHOFlag parameter is used to enable or disable the PS handover procedure to a neighboring LTE cell.

Event 3C is triggered on the basis of the following formula:

MOtherRAT≥ TOtherRAT + H3c/2

Where,

MOtherRAT is the filtered measurement value of the LTE cell. U2LTEFilterCoef specifies the filter coefficient for the measurement value.

TOtherRAT is the absolute inter-RAT redirection threshold and can be set by TargetRatThdRSRP and TargetRatThdRSRQ.

H3c is the hysteresis value of event 3C and can be set by Hystfor3C.

4.4 Decision and Execution

After receiving the measurement report of event 3C of an LTE cell, the RNC redirects the UE to the LTE cell.

The RNC sends the UE an RRC CONNECTION RELEASE message and indicates the frequency of the target LTE cell. The UE attempts to access the LTE cell on the frequency indicated in the message.






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WCDMA RAN

Mobility Between UMTS and LTE 5 Engineering Guidelines



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5 Engineering Guidelines

5.1 Typical Scenarios

Typical Scenario 1

In the early stage of LTE network deployment, the network does not support CS services. To make voice calls, users have to fall back to UMTS by using the Circuit Switch FallBack (CSFB) feature.

After the CS service of a UE falls back to UMTS, the PS service of the UE is also falls back from LTE to UMTS. A PS service generally lasts longer than a CS service. Assuming that a UE under the UMTS and LTE overlapping coverage has ended a CS service in UMTS and still has an ongoing PS service, the UE and the ongoing PS service will be redirected to LTE.

Typical Scenario 2

When a UE under the UMTS and LTE overlapping coverage originates a PS service in UMTS, the RNC makes a decision based on the indication in the RAB assignment message sent by the core network (CN). If the indication does not specify RABs that cannot be shifted to LTE, the RNC will hand the UE over to LTE if the LTE signal quality is satisfactory.

5.2 Main Factors Affecting This Feature

The RNC decides whether to redirect the UE to LTE, based on the IE "E-UTRAN Service Handover" in the RAB assignment message or the Relocation Request message from the CN. If this IE specifies that a RAB cannot be set up in LTE, the UE cannot be redirected to LTE. The UMTS-to-LTE PS handover or redirection of a dual-mode UE is determined by the CN settings. If the CN does not issue the settings, the RNC makes decision based on the parameter setting in the RNC.

The UE must support LTE signal measurement and UMTS-to-LTE PS redirection. This is because the UE needs to measure the LTE signal quality before a redirection can be performed. Quality-based redirection increases the redirection success rate and decreases the call drop rate.

5.3 Suggestions for Deploying This Feature

Compared with the PS redirection, the PS handover interrupts services for a shorter amount of time but causes a heavier signaling load. Therefore, a PS handover is preferred if the network is capable of handling the heavy signaling load. Otherwise, a PS redirection is preferred.

5.4 Performance Monitoring

The counter VS.U2LTEHO.RRCRelease.Service can be used to measure the number of service-based cell-level redirections from UMTS to LTE triggered by the RRC Connection Release message.

WCDMA RAN

Mobility Between UMTS and LTE 6 Parameters



6-1

6 Parameters

Table 6-1 Parameter description

Parameter ID NE MML Command Description

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

Default Value: HO_TO_EUTRAN_SHALL_NOT_BE_PERFORM

HoSwitch BSC6900 SET UCORRMALGOSWITCH(Optional)

Meaning: HandOver switch group.

1) HO_ALGO_HCS_SPEED_EST_SWITCH: When the switch is on, the RNC evaluates the UE's moving speed in the HCS and initiates fast intra-layer or slow inter-layer handover.

2) HO_ALGO_LDR_ALLOW_SHO_SWITCH: When the switch is on, the LDR inter-frequency handover is allowed during soft handover.

3) HO_ALGO_MBMS_FLC_SWITCH: When the switch is on, the UE requires that the redirection strategy be used for frequency layer convergence.

4) HO_ALGO_OVERLAY_SWITCH: When the switch is on, the associated receiving and mobility algorithms of the overlay network are used. When the switch is not on, the associated algorithms are not used. Overlay network is an UTRAN network covering present network, it supports HSPA, MBMS and other new features. To satisfy new requirements of operator and restrictions of present network, overlay network realizes operation distribution and load sharing between new network and present network, also gives special handling for mobility management of network verge.

5) HO_INTER_FREQ_HARD_HO_SWITCH: When the switch is on, the RNC is allowed to initiate inter-frequency measure control or the load-based inter-frequency hard handover upon the handover decision on inter-frequency load.

6) HO_INTER_RAT_CS_OUT_SWITCH: When


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the switch is on, the RNC is allowed to initiate inter-frequency measure control and the CS inter-RAT hard handover from the 3G network to the 2G network.

7) HO_INTER_RAT_PS_3G2G_CELLCHG_NACC_SWITCH: When the switch is on, the NACC function is supported during the PS inter-RAT handover from the 3G network to the 2G network in the cell change order process. When the switch is not on, the NACC function is not supported. When PS_3G2G_RELOCATION_SWITCH is ON, this switch is useless. When the NACC function is supported, the UE skips the reading procedure as the SI/PSI of the target cell is provided after the UE accesses the 2G cell. Thus, the delay of inter-cell handover is reduced.

8) HO_INTER_RAT_PS_3G2G_RELOCATION_SWITCH: When the switch is on, the PS inter-RAT handover from the 3G network to the 2G network is performed in the relocation process. When the switch is not on, the PS inter-RAT handover from the 3G network to the 2G network is performed in the cell change order process.

9) HO_INTER_RAT_PS_OUT_SWITCH: When the switch is on, the RNC is allowed to initiate inter-frequency measure control and the PS inter-RAT hard handover from the 3G network to the 2G network.

10) HO_INTER_RAT_RNC_SERVICE_HO_SWITCH: When the switch is on, the attributes of inter-RAT handover of the services are based on the configuration of RNC parameters. When the switch is not on, the attributes are set on the basis of the CN. If no information is provided by the CN, the attributes are then based on the RNC parameters.

11) HO_INTRA_FREQ_DETSET_INTO_ACTSET_SWITCH: When the switch is on, the cells in the detected set from which the RNC receives their valid event reports can be added to the active set. The cells allowed to be added to the active set must be the neighboring cells of the cells in the active set.

12) HO_INTRA_FREQ_DETSET_RPRT_SWITCH: When the switch is on, statistics on the

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intra-frequency measurement reports of the detected set are taken.

13) HO_INTRA_FREQ_HARD_HO_SWITCH: When the switch is on, the RNC is allowed to initiate the intra-frequency hard handover.

14) HO_INTRA_FREQ_RPRT_1J_SWITCH: When the switch is on, the event 1J is included in the delivery of intra-frequency measurement control if the UE version is R6.

15) HO_INTRA_FREQ_SOFT_HO_SWITCH: When the switch is on, the cells on the RNC can active the soft handover. When the RNC receives reports on the events 1A, 1B, 1C, or 1D, associated addition, removal, and replacement of handover cell of the soft handover are initiated.

16) HO_MC_MEAS_BEYOND_UE_CAP_SWITCH: When the switch is on, the neighboring cell whose frequency band is beyond the UE's capabilities can also be delivered in the inter-frequency measurement list.

17) HO_MC_NCELL_COMBINE_SWITCH: When the switch is on, the neighboring cell combined algorithm is used during the delivery of the objects to be measured. When the switch is not on, the optimal cell algorithm is used.

18) HO_MC_SIGNAL_IUR_INTRA_SWITCH: When the switch is on, intra-frequency handover is allowed over the Iur interface if the UE has only signaling.

19) HO_MC_SIGNAL_SWITCH: When the switch is on, quality measurement on the active set is delivered after signaling setup but before service setup. If the UE is at the cell verge or receives weak signals after accessing the network, the RNC can trigger inter-frequency or inter-RAT handover when the UE sets up the RRC.

20) HO_MC_SNA_RESTRICTION_SWITCH: When the switch is on, the RNC controls the UEs in the connected state based on the configurations on the CN. The UEs can only access and move in authorized cells.

21) HO_LTE_PS_OUT_SWITCH:This bit field is added under "Handover Algorithm Switch". HO_LTE_PS_OUT_SWITCH is the switch for the handover from UMTS to LTE. The meaning of the bit field is as follows:

When this bit field is selected, this switch is set to

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ON. In this case, the RNC is allowed to send an LTE MEASUREMENT CONTROL message to the UE and to initiate an inter-RAT PS handover from UMTS to LTE. When this bit field is not selected, this switch is set to OFF. In this case, the RNC is not allowed to send an LTE MEASUREMENT CONTROL message to the UE or to initiate an inter-RAT PS handover from UMTS to LTE.

22) HO_LTE_SERVICE_PS_OUT_SWITCH :This bit field is added under "Handover Algorithm Switch". HO_LTE_SERVICE_PS_OUT_SWITCH is the switch for the service-based handover from UMTS to LTE. The meaning of the bit field is as follows:

When this bit field is selected, this switch is set to ON. In this case, the RNC is allowed to send an LTE MEASUREMENT CONTROL message to the UE based on service and to initiate an inter-RAT PS service-based handover from UMTS to LTE. When this bit field is not selected, this switch is set to OFF. In this case, the RNC is not allowed to send an LTE MEASUREMENT CONTROL message to the UE based on service or to initiate an inter-RAT PS service-based handover from UMTS to LTE.

23) HO_H2G_SRVCC_SWITCH :This bit is a Single Radio Voice Call Continuity (SRVCC) switch for the VoIP service that is handed over to GERAN. SRVCC ensures the continuity of voice services that are handed over between the CS domain and the IP Multimedia Subsystem (IMS).

The meaning of the bit is as follows:

When it is set to "ON", it indicates that the VoIP service can be handed over to GERAN through SRVCC procedure.

When it is set to "OFF", it indicates that the VoIP service cannot be handed over to GERAN through SRVCC procedure.

GUI Value Range: HO_ALGO_HCS_SPEED_EST_SWITCH, HO_ALGO_LDR_ALLOW_SHO_SWITCH, HO_ALGO_MBMS_FLC_SWITCH, HO_ALGO_OVERLAY_SWITCH, HO_INTER_FREQ_HARD_HO_SWITCH, HO_INTER_RAT_CS_OUT_SWITCH, HO_INTER_RAT_PS_3G2G_CELLCHG_NACC_SWITCH, HO_INTER_RAT_PS_3G2G_RELOCATION_S

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WITCH, HO_INTER_RAT_PS_OUT_SWITCH, HO_INTER_RAT_RNC_SERVICE_HO_SWITCH, HO_INTRA_FREQ_DETSET_INTO_ACTSET_SWITCH, HO_INTRA_FREQ_DETSET_RPRT_SWITCH, HO_INTRA_FREQ_HARD_HO_SWITCH, HO_INTRA_FREQ_RPRT_1J_SWITCH, HO_INTRA_FREQ_SOFT_HO_SWITCH, HO_MC_MEAS_BEYOND_UE_CAP_SWITCH, HO_MC_NCELL_COMBINE_SWITCH, HO_MC_SIGNAL_IUR_INTRA_SWITCH, HO_MC_SIGNAL_SWITCH, HO_MC_SNA_RESTRICTION_SWITCH, HO_LTE_PS_OUT_SWITCH, HO_LTE_SERVICE_PS_OUT_SWITCH, HO_H2G_SRVCC_SWITCH

Actual Value Range: HO_ALGO_HCS_SPEED_EST_SWITCH, HO_ALGO_LDR_ALLOW_SHO_SWITCH, HO_ALGO_MBMS_FLC_SWITCH, HO_ALGO_OVERLAY_SWITCH, HO_INTER_FREQ_HARD_HO_SWITCH, HO_INTER_RAT_CS_OUT_SWITCH, HO_INTER_RAT_PS_3G2G_CELLCHG_NACC_SWITCH, HO_INTER_RAT_PS_3G2G_RELOCATION_SWITCH, HO_INTER_RAT_PS_OUT_SWITCH, HO_INTER_RAT_RNC_SERVICE_HO_SWITCH, HO_INTRA_FREQ_DETSET_INTO_ACTSET_SWITCH, HO_INTRA_FREQ_DETSET_RPRT_SWITCH, HO_INTRA_FREQ_HARD_HO_SWITCH, HO_INTRA_FREQ_RPRT_1J_SWITCH, HO_INTRA_FREQ_SOFT_HO_SWITCH, HO_MC_MEAS_BEYOND_UE_CAP_SWITCH, HO_MC_NCELL_COMBINE_SWITCH, HO_MC_SIGNAL_IUR_INTRA_SWITCH, HO_MC_SIGNAL_SWITCH, HO_MC_SNA_RESTRICTION_SWITCH, HO_LTE_PS_OUT_SWITCH, HO_LTE_SERVICE_PS_OUT_SWITCH, HO_H2G_SRVCC_SWITCH

Default Value: None

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.

GUI Value Range: 0~15

Actual Value Range: 0~7.5


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6-6


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.

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

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

Default Value: MeasurementQuantity

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,

















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6-7


SIB19, SIB11BIS

Default Value: None

SuppPSHOFlag BSC6900 ADD UEXT2GCELL(Optional)

MOD UEXT2GCELL(Optional)

Meaning: Identifying whether the inter-RAT cell supports PS HO. TRUE indicates that the inter-RAT cell is able to perform the handover procedure with relocation. FALSE indicates that the cell is unable to do so.

GUI Value Range: FALSE, TRUE

Actual Value Range: FALSE, TRUE

Default Value: FALSE

SuppPSHOFlag BSC6900 ADD ULTECELL(Optional)

MOD ULTECELL(Optional)

Meaning: This parameter specifies whether an LTE cell supports PS handover. When this parameter is set to SUPPORT, the RNC, CN NEs, and the LTE cell all support the PS handover from UMTS to LTE. When this parameter is set to NOT SUPPORT, not all of the RNC, CN NEs, and the LTE cell support the PS handover from UMTS to LTE.

GUI Value Range: NotSupport(NotSupport), Support(Support)

Actual Value Range: NotSupport, Support

Default Value: NotSupport

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)

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


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Value*0.5 - 20)

Default Value: 20

ThdPrioritySearch1

BSC6900 ADD UCELLSELRESEL(Optional)

MOD 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 25.304.


Actual Value Range: 0~62

Default Value: 2

ThdPrioritySearch2

BSC6900 ADD UCELLSELRESEL(Optional)

MOD 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.



Actual Value Range: {0~7}

Default Value: 2

ThdToHigh BSC6900 ADD UCELLNFREQPRIOINFO(Optional)

MOD 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 greater than that of the serving cell.

The UE measures cells on the target frequency for cell reselection.



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6-9


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.




Default Value: 2

ThdToLow BSC6900 ADD UCELLNFREQPRIOINFO(Optional)

MOD 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.




Default Value: 2

Treselections BSC6900 ADD UCELLSELRESEL(Optional)

MOD UCELLSELRESEL(Opti

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

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6-10


onal) 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.



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, D640, D1280, D2560, D5000

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

Default Value: D0

U2LTEFilterCoef BSC6900 ADD UCELLU2LTEHONCOV(Optional)


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.















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6-11


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

Default Value: D3

U2LTEMeasTime BSC6900 ADD UCELLU2LTEHONCOV(Optional)


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.



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)


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)


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WCDMA RAN

Mobility Between UMTS and LTE 7 Counters



7-2

Counter ID

Counter Name Counter Description Feature ID Feature Name

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


mobility between umts and lte

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