CE Overbooking(RAN15.0 07)

WCDMA RAN

CE Overbooking Feature ParameterDescription

Issue 07Date 2014-12-11

HUAWEI TECHNOLOGIES CO., LTD.

Copyright Huawei Technologies Co., Ltd. 2014. All rights reserved.No part of this document may be reproduced or transmitted in any form or by any means without prior writtenconsent of Huawei Technologies Co., Ltd. Trademarks and Permissions

and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd.All other trademarks and trade names mentioned in this document are the property of their respective holders. NoticeThe purchased products, services and features are stipulated by the contract made between Huawei and thecustomer. All or part of the products, services and features described in this document may not be within thepurchase scope or the usage scope. Unless otherwise specified in the contract, all statements, information,and recommendations in this document are provided "AS IS" without warranties, guarantees or representationsof any kind, either express or implied.

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Website: http://www.huawei.comEmail: [email protected]

Issue 07 (2014-12-11) Huawei Proprietary and ConfidentialCopyright Huawei Technologies Co., Ltd.

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Contents

1 About This Document..................................................................................................................11.1 Scope..............................................................................................................................................................................11.2 Intended Audience..........................................................................................................................................................11.3 Change History...............................................................................................................................................................11.4 Differences Between Base Station Types.......................................................................................................................52 Overview.........................................................................................................................................63 Technical Description...................................................................................................................84 Credit Resource-based CAC......................................................................................................105 Basic Congestion based on NodeB Credit Resources...........................................................146 TTI Selection During PS BE Service Setup or Reconfiguration........................................157 Admission-CE-based Dynamic TTI Adjustment for a Single BE Service over HSUPA............................................................................................................................................................168 Related Features...........................................................................................................................189 Network Impact...........................................................................................................................1910 Engineering Guidelines...........................................................................................................2110.1 When to Use CE Overbooking...................................................................................................................................2110.2 Required Information.................................................................................................................................................2110.3 Deployment................................................................................................................................................................2210.3.1 Requirements...........................................................................................................................................................2210.3.2 Activation................................................................................................................................................................2310.3.3 Activation Observation............................................................................................................................................2410.3.4 Deactivation.............................................................................................................................................................2410.4 Performance Optimization..........................................................................................................................................2410.5 Parameter Optimization..............................................................................................................................................3010.6 Troubleshooting..........................................................................................................................................................3011 Parameters...................................................................................................................................3112 Counters......................................................................................................................................7413 Glossary.......................................................................................................................................76

WCDMA RANCE Overbooking Feature Parameter Description Contents


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14 Reference Documents...............................................................................................................77

WCDMA RANCE Overbooking Feature Parameter Description Contents


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1 About This Document1.1 Scope

This document describes WRFD-140212 CE Overbooking, including its technical principles,related features, network impact, and engineering guidelines.

This document applies to the following NE types.

NE Type NE ModelRNC BSC6900 and BSC6910NodeB Macro 3900 series macro base stations: BTS3900, BTS3900A,

BTS3900L, BTS3900AL, DBS3900, and BTS3900C3800 series macro base stations: DBS3800, BTS3812E, andBTS3812AE

Micro BTS3803E and BTS3902ELampSite DBS3900 LampSite

1.2 Intended AudienceThis document is intended for personnel who:l Need to understand the features described hereinl Work with Huawei products

1.3 Change HistoryThis section provides information about the changes in different document versions. There aretwo types of changes, which are defined as follows:

WCDMA RANCE Overbooking Feature Parameter Description 1 About This Document


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l Feature changeChanges in features of a specific product version

l Editorial changeChanges in wording or addition of information that was not described in the earlier version

RAN15.0 07 (2014-12-11)This issue includes the following changes.

ChangeType

Change Description ParameterChange

Featurechange

None None

Editorialchange

Optimized descriptions in the document. None


ChangeType


Featurechange

Added the UBBPd in "Dependencies on Hardware." Fordetails, see 10.3.1 Requirements.

None

Editorialchange

None None


ChangeType


Featurechange

Added activation observation and performancemonitoring methods. For details, see 10.3.3 ActivationObservation.

None

Editorialchange

None None



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ChangeType


Featurechange

None None

Editorialchange

Optimized descriptions in the document.Added the descriptions about the feature and functiondifferences between the various types of NodeBs. Fordetails, see section 1.4 Differences Between BaseStation Types.

None


ChangeType


Featurechange

None None

Editorialchange

Added formulas used to calculate the number of CEs requiredfor admitting HSUPA UEs in chapter 4 Credit Resource-basedCAC.

None


ChangeType

Change Description Parameter Change

Featurechange

None None

Editorialchange

Optimized the descriptions in sections 10.1When to Use CE Overbooking and 10.2Required Information.

None

RAN15.0 01 (2013-04-28)This issue does not include any changes.



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RAN15.0 Draft A (2013-01-30)Compared with Issue 03 (2012-11-30) of RAN14.0, Draft A (2013-01-30) of RAN15.0 includesthe following changes.

ChangeType


Featurechange

Original: For HSUPA UEs, the NodeB adjusts the credit resourceusage of admitted UEs to be less than or equal to the calculationresult of the following formula: Credit resource usage = Max(Credit resources required for ensuring the GBR, Credit resourcesrequired for transmitting one RLC PDU) If the UEs use a 10 msTTI, the adjustment is based on the UE rate.

None

If the UEs use a 2 ms TTI, the adjustment is based on the UE rateand the REVDPARA4parameter. Revised: For HSUPA UEs usinga 10 ms TTI: The NodeB adjusts the amount of credit resourcesthat will be consumed by each admitted UE based on the UE datarate. The adjusted amount does not exceed the credit resourceamount corresponding to Rateone RLC PDU. For HSUPA UEs usinga 2 ms TTI: The NodeB adjusts the amount of credit resources thatwill be consumed by each admitted UE based on the UE data rateand the setting of the CERSVFOR2MSUSER parameter. Theadjusted amount does not exceed the credit resource amountcorresponding to Rateone RLC PDU.

None

Editorialchange

Optimized the description in section 9 Network Impact. NoneOptimized the description in section 10.1 When to Use CEOverbooking.

None

Optimized the description in section 10.2 RequiredInformation.

None

Replaced RESERVED_SWITCH_1_BIT5 under theRsvSwitch1 parameter in the SET UALGORSVPARA commandwithPERFENH_CELL_HSUPA_CAP_CHANGE_OPT_SWITCH under the PerfEnhanceSwitch(BSC6900,BSC6910)parameterin the SET UCORRMPARA command.Replaced the REVDPARA4 parameter with theCERSVFOR2MSUSER parameter.

PerfEnhanceSwitch(BSC6900,BSC6910)CERSVFOR2MSUSER



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1.4 Differences Between Base Station TypesFeature Support by Macro, Micro, and LampSite Base Stations

FeatureID

Description

Supported byController(Y/N/NA)

Supported byMacroNodeBs

Supported by MicroNodeBs

Supported byLampSiteNodeBs

BSC6900

BSC6910

BTS3803E

BTS3902E

WRFD-140212

CEOverbooking

Yes Yes Yes Yes Yes Yes



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2 OverviewBackground

After WRFD-010638 Dynamic CE Resource Management is applied, the RNC calculates theamount of credit resources that will be consumed by an admitted High Speed Uplink PacketAccess (HSUPA) UE using the following formula:Rate = MAX (GBR, Rateone RLC PDU)

wherel GBR stands for guaranteed bit rate.l Rateone RLC PDU is the rate at which one Radio Link Control (RLC) packet data unit (PDU)

is transmitted at one transmission time interval (TTI).l If the uplink layer 2 enhancement function is enabled, the size of the RLC PDU in the

preceding formula equals that of the smallest RLC PDU. If this function is not enabled, thesize of the RLC PDU in the formula is fixed. For the size of the RLC PDU in the formula,see HSPA Evolution Feature Parameter Description.

The RNC uses the preceding formula to ensure HSUPA user experience.However, after the preceding formula is applied, the channel element (CE) utilization ratio onthe NodeB side is lower than the credit resource utilization ratio on the RNC side for thefollowing reasons:l The NodeB calculates the CE utilization ratio based on actual user data rates.l An actual user data rate is usually lower than the GBR or Rateone RLC PDU.l The penetration rate of HSUPA UEs using the 2 ms TTI is high.As a result, the RNC may reject new UE access requests when the CE utilization ratio on theNodeB side is low, which limits the RNC's capability to perform admission control based oncredit resource utilization ratio. To enhance the RNC capability, you can use the CE Overbookingfeature.

IntroductionCE Overbooking works as follows:

WCDMA RANCE Overbooking Feature Parameter Description 2 Overview


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l The NodeB calculates the amount of CEs that will be consumed by an admitted UE, includesthe calculated amount into a private information element (IE) in the Common MeasurementReport message, and sends the message to the RNC at an interval specified by theTenMsecForUlBasicMeas(BSC6910,BSC6900) parameter.

l The RNC calculates credit resource utilization ratio based on the reported amount.This feature maximizes the RNC's capability to perform admission control based on creditresource utilization ratio.Figure 2-1 shows the working principle of CE Overbooking.

Figure 2-1 CE Overbooking

BenefitsWhen the penetration rate of HSUPA UEs using the 2 ms TTI is high, the average HSUPAservice throughput is low. Therefore, this feature provides the following benefits:l More UEs admitted by the RNC. For details, see 4 Credit Resource-based CAC.l Reduced probability of basic congestion in credit resources. For details, see 5 Basic

Congestion based on NodeB Credit Resources.l More HSUPA UEs allowed to use the 2 ms TTI during PS BE service setup and

reconfiguration. For details, see 6 TTI Selection During PS BE Service Setup orReconfiguration.

l Reduced number of times that the TTI changes or LDR is triggered due to basic congestionof uplink credit resources. For details, see 7 Admission-CE-based Dynamic TTIAdjustment for a Single BE Service over HSUPA.

WCDMA RANCE Overbooking Feature Parameter Description 2 Overview


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3 Technical DescriptionThe CE usage that the NodeB periodically calculates and reports to the RNC involves thepredicted CE consumption of R99 UEs and that of HSUPA UEs.Because this feature applies only to HSUPA UEs, the RNC calculates the amount of creditresources that will be consumed by admitted R99 UEs based on the maximum bit rate (MBR).Table 3-1 describes the methods for calculating the credit resource usage before and after thisfeature is activated and presumes that Dynamic CE Resource Management has been enabled.

Table 3-1 Credit resource calculation methods before and after activating this featureCEOverbooking

Credit Resources That Will Be Consumed by Admitted UEs

Not activated The RNC calculates the amount of credit resources that will be consumedby admitted HSUPA UEs using the following formula:Credit resource usage = Max (Credit resources required for ensuring theGBR, Credit resources required for transmitting one RLC PDU)

WCDMA RANCE Overbooking Feature Parameter Description 3 Technical Description


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CEOverbooking

Credit Resources That Will Be Consumed by Admitted UEs

Activated The NodeB calculates the amount of credit resources consumed byadmitted UEs as follows:l For HSUPA UEs using the 10 ms TTI: The NodeB adjusts the amount

of credit resources that will be consumed by each admitted UE basedon the UE data rate. The adjusted amount does not exceed the creditresource amount corresponding to Rateone RLC PDU.

l For HSUPA UEs using the 2 ms TTI: The NodeB adjusts the amountof credit resources that will be consumed by each admitted UE basedon the UE data rate and the setting of the CERSVFOR2MSUSERparameter. The adjusted amount does not exceed the credit resourceamount corresponding to Rateone RLC PDU.

NOTECERSVFOR2MSUSER indicates the minimum number of CEs reserved foradmitted HSUPA UEs using the 2 ms TTI. The parameter value ranges from 1 to8 and its default value is 4 (unit: CE). If this parameter is set to a value beyond itsrange, the system uses the default parameter value. A smaller value of this parameterleads to a larger number of admitted UEs. In this case, the call drop rate may increaseand user experience cannot be ensured. A larger value of this parameter leads to asmaller number of admitted UEs. In this case, the call drop rate does not increaseand user experience can be ensured.In the uplink, one CE equals two credits.In the downlink, one CE equals one credit.

NOTE

The Dynamic CE Resource Management feature must be enabled before the CE Overbooking feature.Table 3-1 assumes that the Dynamic CE Resource Management feature has been enabled, regardless ofwhen the CE Overbooking feature has been activated or not.

WCDMA RANCE Overbooking Feature Parameter Description 3 Technical Description


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4 Credit Resource-based CACUpon receiving a service setup request, the RNC makes an admission decision based on creditresources as follows:l For a radio resource control (RRC) connection setup request, the admission is successful

if the remaining credit resources at the local cell group (if any) and NodeB levels aresufficient for the request.

l For a handover service, the admission is successful if the remaining credit resources at thelocal cell group (if any) and NodeB levels are sufficient for the service.

l For other types of services, the RNC checks whether the amount of the remaining creditresources at the local cell group (if any) and NodeB levels is greater than or equal to theUlHoCeResvSf(BSC6900,BSC6910) parameter after new services are admitted. If so, theadmission is successful.

The CE Overbooking feature performs service admission and optimization based on thepreceding decision procedure. Activating this feature brings the following advantages:l The amount of credit resources reported by the NodeB decreases.l The amount of remaining credit resources on the RNC side increases.l The RNC can admit more UEs.Table 4-1 describes how to calculate the number of CEs required for admitting HSUPA UEswhen CE Overbooking is activated and when it is not activated.

WCDMA RANCE Overbooking Feature Parameter Description 4 Credit Resource-based CAC


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Table 4-1 Calculating the number of CEs required for admitting HSUPA UEs in differentscenarios

Item DCERM:DeactivatedDCCC:Activated

DCERM:DeactivatedDCCC:Deactivated

DCERM:ActivatedCEOverbooking:Activated

DCERM:ActivatedCEOverbooking:Deactivated

Calculationmethod

Calculatingbased on theHsupaInitialRate(BSC6900,BSC6910) value

Calculatingbased on theGBR

For HSUPA UEsusing the 2 msTTI:Rate = MAX(CeReservedForNonEnh2msQos,MIN (Actual datarate, Rateone RLCPDU))For HSUPA UEsusing the 10 msTTI:Rate = MIN(Actual data rate,Rateone RLC PDU)

Calculatingusing thefollowingformula:Rate = MAX(GBR, RateoneRLC PDU)

Counterproviding theconsumption ofCE resourcesfor UEadmission

VS.LC.ULCreditUsed.Mean


VS.NodeB.ULCreditUsed.Mean


For an HSUPAUE using the 10ms TTI:l MBR = 2

Mbit/sl GBR = 64

kbit/sl Rateone RLC

PDU = 32kbit/s

l HsupaInitialRate = 256kbit/s


l Number ofCEs foradmission = 8

l MBR = 2Mbit/s

l Number ofCEs foradmission =32

l Rateone RLCPDU = 32 kbit/s

l Actual datarate = 32 kbit/s


l GBR = 64kbit/s

l Rateone RLCPDU = 32kbit/s

l Number ofCEs foradmission= 2



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Item DCERM:DeactivatedDCCC:Activated

DCERM:DeactivatedDCCC:Deactivated

DCERM:ActivatedCEOverbooking:Activated

DCERM:ActivatedCEOverbooking:Deactivated

For an HSUPAUE using the 2ms TTI:l MBR = 5

Mbit/sl GBR = 64

kbit/sl Rateone RLC

PDU = 160kbit/sHsupaInitialRate = 256kbit/s


l Number ofCEs foradmission = 8

l MBR = 5Mbit/s


l Rateone RLCPDU = 160 kbit/s

l Actual datarate = 32 kbit/sCeReservedForNonEnh2msQos = 1

l Number ofCEs foradmission =2.4

l GBR = 64kbit/s

l Rateone RLCPDU = 160kbit/sNumber ofCEs foradmission= 8

In Table 4-1:l The GBR of BE services (background and interactive services) is specified by the UlGBR

(BSC6900,BSC6910) parameter in the SET USERGBR (RAN11.0) and SETUUSERGBR (RAN12.0 and later) commands.

l The HsupaInitialRate(BSC6900,BSC6910) parameter is under the SET FRC commandin RAN11.0 and the SET UFRC command in RAN12.0 and later.

l Assume that one RLC PDU contains 320 bits. Rateone RLC PDU is 32 kbit/s for a 10 ms TTIHSUPA UE and 160 kbit/s for a 2 ms TTI HSUPA UE.

l When CE Overbooking is not activated, the VS.LC.ULCreditUsed.Mean counter providesthe consumption of CE resources for UE admission. When CE Overbooking is activated,the VS.NodeB.ULCreditUsed.Mean counter provides the consumption of CE resources forUE admission, but the VS.LC.ULCreditUsed.Mean counter still works without anychanges to its calculating method. The value of the VS.LC.ULCreditUsed.Mean counteris not used for CE resource-based admission control.

l CERSVFOR2MSUSER provides the minimum number of CE resources reserved forHSUPA UEs using the 2 ms TTI. This number is specified by the REVDPARA4 parameterin RAN14.0.

l In this table, CE resource consumption for UE admission by SRBs is excluded. For suchconsumption, see CE Resource Management Feature Parameter Description, regardlessof whether SRB over DCH or SRB over HSUPA is applied. For HSUPA services, if SRBsare carried over DCHs, each SRB consumes an extra CE.

l Assuming that there is a 2 ms TTI HSUPA UE whose actual rate is 32 kbit/s and theconditions for the UE are as follows:



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The UE transmits 40-byte packets using SF4 (mapped to 8 CEs) during 20% of its onlineperiod, and does not transmit any data for the remainder of this period. CeReservedForNonEnh2msQos under the REVDPARA4 parameter (RAN14.0) or

CERSVFOR2MSUSER (RAN15.0 and later) is set to 1.The average CE consumption of the UE is 8 x 0.2 + 1 x 0.8 = 2.4. For mapping betweenthe SF and the CE consumption, see CE Resource Management Feature ParameterDescription.

The NodeB baseband board uses different processing specifications for UEs with different uplinkbearer services, for example, HSUPA TTI 2 ms services, HSUPA TTI 10 ms services, and R99services. CE Overbooking enables the network to admit more UEs. Therefore, it is good practiceto enable PerfEnhanceSwitch(BSC6900,BSC6910):PERFENH_CELL_HSUPA_CAP_CHANGE_OPT_SWITCH. When multiple UEs accessthe network,l If PerfEnhanceSwitch(BSC6900,BSC6910):

PERFENH_CELL_HSUPA_CAP_CHANGE_OPT_SWITCH is disabled, the systemattempts to admit all new UEs employing the highest capabilities by the terminal. In thisway, admitted UEs cause too much uplink DSP load and therefore the total number ofadmitted UEs decreases.

l If PerfEnhanceSwitch(BSC6900,BSC6910):PERFENH_CELL_HSUPA_CAP_CHANGE_OPT_SWITCH is enabled, the NodeBbaseband board dynamically selects proper uplink service bearers for UEs to maximize thenumber of admitted UEs according to actual NodeB processing specifications. If the loadof the NodeB baseband board is higher than or equal to 82%, a new UE supporting 2 msTTI is only allowed to set up services with 10 ms TTI. If the load of the NodeB basebandboard is higher than 87%, a new UE supporting HSUPA is only allowed to set up serviceson R99 channels.

For details about Call Admission Control (CAC) based on NodeB credit resources, see CallAdmission Control Feature Parameter Description.



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5 Basic Congestion based on NodeB CreditResources

Basic congestion at the local cell group or NodeB level is triggered when the following conditionis met:Remaining uplink credit resources at the local cell group or NodeB level < Credit resourcesmapped to UlLdrCreditSfResThd(BSC6900,BSC6910)whereUlLdrCreditSfResThd(BSC6900,BSC6910) can be set by running the MML command ADDUNODEBLDR.CE Overbooking brings the following benefits:l Increases the remaining uplink credit resources.l Relieves basic congestion because the preceding condition is less likely to be met.For details about basic congestion related to NodeB credit resources, see Load Control FeatureParameter Description.

WCDMA RANCE Overbooking Feature Parameter Description 5 Basic Congestion based on NodeB Credit Resources


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6 TTI Selection During PS BE Service Setup orReconfiguration

When a PS BE service is set up or reconfigured, TTI selection is implemented. The TTI for anHSUPA UE is set to 2 ms if all the following conditions are met:l The UE and the NodeB support 2 ms TTI.l MAP_HSUPA_TTI_2MS_SWITCH under the MapSwitch(BSC6900,BSC6910)

parameter is set to ON.l Credit resources are sufficient.l If DRA_BASE_RES_BE_TTI_RECFG_SWITCH and

DRA_BASE_RES_BE_TTI_INIT_SEL_SWITCH under the DraSwitch(BSC6900,BSC6910) parameter are set to ON, one of the following conditions must bemet: The ResourceOption(BSC6900,BSC6910) parameter is set to RTWP, and Uu

resources are sufficient. The ResourceOption(BSC6900,BSC6910) parameter is set to Iub, and Iub resources

are sufficient. The ResourceOption(BSC6900,BSC6910) parameter is set to CE, and CE resources

are sufficient.l The MBR of the UE is greater than or equal to BeHsupa2msTtiRateThs

(BSC6900,BSC6910).CE Overbooking brings the following advantages: Increases the remaining uplink credit resources. Increases the number of HSUPA UEs with a 2 ms TTI. Compared with 10 ms TTI, 2

ms TTI enables HSUPA UEs to achieve a higher peak rate and a shorter schedulingdelay, which improves user experience.

For details about dynamic TTI adjustment, see HSUPA TTI Selection Feature ParameterDescription.

WCDMA RANCE Overbooking Feature Parameter Description

6 TTI Selection During PS BE Service Setup orReconfiguration


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7 Admission-CE-based Dynamic TTIAdjustment for a Single BE Service over HSUPA

The TTI for an HSUPA UE processing BE services is switched from 2 ms to 10 ms when anyof the following conditions is met:l The credit resources at the local cell group or NodeB level are less than those specified by

UlTtiCreditSfResThd(BSC6900,BSC6910), indicating that the credit resources areinsufficient.

l When adaptive retransmission (controlled byPC_HSUPA_HARQNUM_AUTO_ADJUST_SWITCH under theUpRatioFor2msTo10msBaseCE(BSC6900,BSC6910) parameter) is disabled, or whenadaptive retransmission is enabled together with small data retransmission, the throughputis lower than the value of the following formula: UpRatioFor2msTo10msBaseCE(BSC6900,BSC6910) x BeHsupa2msTtiRateThs(BSC6900,BSC6910)/(1 +EdchTargetLittleRetransNum(BSC6900,BSC6910)).

l When adaptive retransmission (controlled byPC_HSUPA_HARQNUM_AUTO_ADJUST_SWITCH under theUpRatioFor2msTo10msBaseCE(BSC6900,BSC6910) parameter) is enabled togetherwith large data retransmission, the throughput is lower than the value of the followingformula: UpRatioFor2msTo10msBaseCE(BSC6900,BSC6910)*BeHsupa2msTtiRateThs(BSC6900,BSC6910)/(1+ EdchTargetLargeRetransNum(BSC6900,BSC6910)).

CE Overbooking brings the following advantages:l Increases the remaining uplink credit resources.l Reduces the probability of admission-CE-based dynamic TTI adjustment from 2 ms to 10

ms.After CE Overbooking is activated, it is recommended thatDRA_BASE_ADM_CE_BE_TTI_RECFG_SWITCH under the DraSwitch(BSC6900,BSC6910) parameter be set to ON. IfDRA_BASE_ADM_CE_BE_TTI_RECFG_SWITCH is set to ON, the TTI for an HSUPAUE can be switched from 2 ms to 10 ms when CE resources are congested. IfDRA_BASE_ADM_CE_BE_TTI_RECFG_SWITCH is not set to ON, CE resources may beinsufficient to transmit one RLC PDU, which may result in Traffic Radio Bearer (TRB) resetand increase the call drop rate.


7 Admission-CE-based Dynamic TTI Adjustment for aSingle BE Service over HSUPA


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For details about dynamic TTI adjustment, see HSUPA TTI Selection Feature ParameterDescription.


7 Admission-CE-based Dynamic TTI Adjustment for aSingle BE Service over HSUPA


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8 Related FeaturesPrerequisite Features

CE Overbooking depends on WRFD-010638 Dynamic CE Resource Management.

Mutually Exclusive FeaturesNone

Impacted FeaturesIt is recommended that CE Overbooking be used simultaneously with the function of dynamicTTI adjustment of HSUPA UEs that use a 2 ms TTI and perform admission-CE-based BEservices.CE Overbooking does not require that the remaining CE resources meet the requirement of theformula MAX {GBR, Rateone RLC PDU} when admitting a UE. Therefore, the UE's GBR cannotbe ensured. If there are many UEs who use the 2 ms TTI, CEs become insufficient for some UEswhen multiple HSUPA UEs have burst data transmission, leading to call drops. The TTIadjustment algorithm can switch the 2 ms TTI to the 10 ms TTI when CE resources are congested,reducing call drops caused by CE Overbooking.

WCDMA RANCE Overbooking Feature Parameter Description 8 Related Features


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9 Network ImpactSystem Capacity

This feature has the following impacts on system capacity:l Reduces the uplink credit resources consumed by online UEs. In a network where a cell

has an average number of five or more than HSUPA UEs using the 2 ms TTI, this featurereduces the uplink credit resource consumption by 10% to 40%.

l Increases the number of UEs admitted to a cell. The more UEs rejected due to uplink creditresource congestion, the more significant the effect. When resources over the air interfaceor Iub interface are insufficient, CE Overbooking can increase the cell throughput.

l Decreases the number of times that the TTI is switched or LDR is triggered due to basiccongestion of uplink credit resources.

Network PerformanceCE Overbooking has impacts on network performance in the following scenarios:l Reduces the number of admission failures due to credit resource congestion and therefore

increases the radio access success rate.l Increases the call drop rate of HSUPA UEs because of the CE resource and air interface

resource insufficiency caused by an increase in the admitted UEs and the probability ofmultiple UEs transmitting data simultaneously.

l Increases the call drop rate because HSUPA UEs using the 2 ms TTI are more likely toexperience call drops than HSUPA UEs using the 10 ms TTI in weak coverage areas. Themore HSUPA UEs using the 2 ms TTI there are, the higher the the call drop rate.

NOTE

Once CE Overbooking is enabled, the amount of credit resources consumed by admitted UEs is related tothe UEs' actual service rate. If the amount of credit resources consumed by admitted UEs is large due to ahigh actual service rate, the handover success rate and the RRC connection setup success rate may decreasebecause the reserved resources may be consumed by admitted UEs. However, the probability of thisproblem occurring is low and network performance is generally not affected.

l After CE Overbooking is enabled, there is a possibility of increased admission rejectionsover the Iub interface if a large number of UEs have accessed the network. However, CEOverbooking does not affect the radio access success rate.

WCDMA RANCE Overbooking Feature Parameter Description 9 Network Impact


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NOTE

Before CE Overbooking is enabled, the RNC updates the consumption of CE resources for UEadmission when UEs access the network or release RRC connections.Once CE Overbooking is enabled, the NodeB updates the consumption of CE resources realtime forUE admission, calculates the average consumption of CE resources every 640 ms and reports to theRNC every second. During the report interval, the RNC cannot learn about the accurate consumptionof CE resources, resulting in inconsistent information between the RNC and the NodeB. Therefore,there is a possibility that some UEs are admitted by the RNC but fail to be admitted by the NodeB.

WCDMA RANCE Overbooking Feature Parameter Description 9 Network Impact


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10 Engineering Guidelines10.1 When to Use CE Overbooking

To improve RNC's capability to perform admission control based on credit resource usage, CEOverbooking should be enabled in a network that meets all of the following conditions:l Large number of smart phones, especially HSUPA UEs using the 2 ms TTIl Insufficient credit resourcesl Access request of a UE rejected by RAN due to uplink credit resource congestionl Average data rate being less than or equal to 150 kbit/s for HSUPA UEs using the 2 ms

TTI

10.2 Required InformationBefore deploying CE Overbooking, collect the values of the following counters on the livenetwork:l VS.HSUPA.UE.Mean.CATx (x 6): measures the number of HSUPA UEs that support

the 2 ms TTI in a cell. In a network where a cell has an average number of five or morethan HSUPA UEs using the 2 ms TTI, this feature provides noticeable benefits.

l VS.LC.ULCreditUsed.Mean: measures the uplink credit resource usage in a cell. When theuplink credit resource usage of a network is high, the average number of consumed uplinkcredit resources across cells under a base station during busy hours exceeds 70% of thepurchased credit resources, and the maximum number of consumed uplink credit resourcesin a cell can possibly equal the number of the purchased credit resources. In this case, uplinkcredit resource congestion will easily occur.

l VS.LCC.LDR.Num.ULCE: measures the number of LDR events triggered by uplink creditresource congestion in a cell. When the counter value is large, uplink credit resources areseverely congested.

l VS.HSUPA.TTI2to10.ADMCE.Succ: measures the number of TTI switching eventstriggered by uplink credit resource congestion in a cell. When the counter value is large,uplink credit resources are severely congested.

WCDMA RANCE Overbooking Feature Parameter Description 10 Engineering Guidelines


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l VS.HSUPA.RABEstabTTI10ms.AdmCE.Succ: measures the number of successful RABestablishments for TTI switching from 2 ms to 10 ms triggered by uplink credit resourcecongestion in a cell. When the counter value is large, CE resources are severely congested.

l VS. RAB.FailEstabPS.ULCE.Cong and VS.RAB.FailEstabCS.ULCE.Cong: measure thenumber of PS and CS RABs failed to be established due to uplink credit resource congestionin a cell. When the value of either counter is large, CE resources are severely congested.

l VS.HSUPA.TTI2msUserNumber.x (x = 0 to 5): measures the proportion of HSUPA UEsusing the 2 ms TTI whose average rate is lower than 150 kbit/s in a network. The largerthe proportion indicated by VS.HSUPA.TTI2msUserNumber.0, the more the low-rateHSUPA UEs using the 2 ms TTI on the network, and the higher the gains of this feature.

10.3 Deployment

10.3.1 Requirementsl Dependencies on Hardware

The 3900 series base station must be configured with the UBBPd, WBBPb, WBBPd,or WBBPf board. The DBS3800 must be configured with the EBBC or EBBCd board. The BTS3812E, BTS3812A, and BTS3812AE must be configured with the EBBI,

EBOI, EULP, or EULPd board.NOTE

The CE Overbooking feature can still be activated on a NodeB when the NodeB is not configured asabove. However, the feature benefits will not be applied.

l Dependencies on Other FeaturesBefore enabling this feature, you must enable the feature WRFD-010638 Dynamic CEResource Management.

l LicenseFor details about how to activate the license, see License Management Feature ParameterDescription.

FeatureID

FeatureName

LicenseControlItem

LicenseControlName

NE LicenseAllocation forMultipleOperators

SalesUnit

WRFD-140212

CEOverbooking

LQW9CEOVER01

CEOverbooking (perNodeB)

NodeB Method 1 perNodeB



22

If RAN Sharing or MOCN is enabled, the licensed value is allocated among the primaryand secondary operators according to the value of the "License Allocation for MultipleOperators parameter."Method 1: Some license control items, such as Dynamic CE Function (per NodeB), can beallocated only through the common group. For the NodeB license allocation amongmultiple operators, see License Management Feature Parameter Description.

10.3.2 Activation

Using MML CommandsStep 1 Perform the following steps to activate CE Overbooking:Step 2 After the license controlling this feature is activated, the feature has been activated. (Optional)

Run the NodeB MML command SET NODEBALGPARA to set the minimum number of CEsrequired for admitting HSUPA UEs using the 2 ms TTI. In this step, set 2ms User MinimumAdmission CE.

Step 3 (Optional) Run the RNC MML command SET UCORRMPARA. In this step, select thePERFENH_CELL_HSUPA_CAP_CHANGE_OPT_SWITCH check box under thePerformance Enhancement Switch parameter.

----EndNOTE

It is recommended that the default value of 2ms User Minimum Admission CE be retained.It is recommended that the parameter be set in step 2 so that the network can admit more UEs.

MML Command Examples//Setting the minimum number of CEs required for admitting an HSUPA UE with a 2 ms TTISET NODEBALGPARA: CERSVFOR2MSUSER=4;

Activation (Using the CME)Once the feature license "CE Overbooking (Per NodeB)" is activated, this feature isautomatically available for use. However, you can perform the following steps on the CME toimprove feature performance:

NOTE

When configuring the CE Overbooking feature on the CME, perform a single configuration first, and thenperform a batch modification if required.Configure the parameters of a single object before a batch modification. Perform a batch modificationbefore logging out of the parameter setting interface.

Step 1 Configure a single object on the CME.Set parameters on the CME according to the operation sequence in Table 10-1. For instructionson how to perform the CME single configuration, see CME Single Configuration OperationGuide.



23

Step 2 (Optional) Modify objects in batches on the CME. (CME batch modification center)----EndTo modify objects, such as RNCs, NodeBs, cells, and external UMTS cells, in batches, click

on the CME to start the batch modification wizard. For instructions on how to perform abatch modification through the CME batch modification center, press F1 while running thewizard to obtain online help.

Table 10-1 Configuring user groupsSN MO NE Parameter

NameParameterID

Configurable in CMEBatchModification Center

1 (Optional) NODEBALGPARA

NodeB 2ms UserMinimumAdmissionCE

CERSVFOR2MSUSER

Yes

2 (Optional) UCORRMPARA

RNC PerformanceEnhancement Switch

PerfEnhanceSwitch(BSC6900,BSC6910)

Yes

10.3.3 Activation ObservationTo check whether the CE Overbooking feature has been successfully activated, perform eitherof the following operations:l Check the values of the new counters VS.NodeB.ULCreditUsed.Mean,

VS.NodeB.ULCreditUsed.Max, and VS.NodeB.ULCreditUsed.Min. If any of the valuesis not 0, this feature has been successfully activated.

l Check the value of the real-time tracing item "Adjusted UL NodeB Credit used" on theRNC. If the value is not 65535, the feature has been successfully activated. "Adjusted ULNodeB Credit used" indicates the number of consumed by admitted UEs on the NodeBlevel after CE Overbooking is activated.

l Start an Iub interface tracing task on an RNC LMT. In the tracing results, check whetherthe NBAP_AUDIT_RSP message contains the "CE-overbooking-capable" IE. If so, thisfeature has been successfully activated.

10.3.4 DeactivationDeactivate the license for CE Overbooking on the U2000.

10.4 Performance OptimizationMonitor the following items:



24

l Credit resources consumed by admitted UEsCheck the counters in Table 10-2 to obtain the credit resource usages after CE Overbookingis activated.

Table 10-2 Counters measuring credit resource usages after CE Overbooking is activatedCounter DescriptionVS.NodeB.ULCreditUsed.Mean Average NodeB Credit Usage When CE

Overbooking Is EnabledVS.NodeB.ULCreditUsed.Max Maximum NodeB Credit Usage When CE

Overbooking Is EnabledVS.NodeB.ULCreditUsed.Min Minimum NodeB Credit Usage When CE

Overbooking Is Enabled

The difference between VS.NodeB.ULCreditUsed.Mean and VS.LC.ULCreditUsed.Mean is asfollows:l VS.NodeB.ULCreditUsed.Mean measures the usage of credit resources consumed by

admitted UEs at the NodeB level after CE Overbooking is activated. This counter can alsobe observed using the real-time tracing item "Adjusted UL NodeB Credit used" on the RNCLMT.

l VS.LC.ULCreditUsed.Mean measures the usage of credit resources consumed by admittedUEs at the cell level. This counter is measured regardless of whether CE Overbooking isactivated. This counter can also be observed using the real-time tracing item "UL local cellCredit used" on the RNC LMT.When CE Overbooking takes effect, the value of VS.NodeB.ULCreditUsed.Mean for aNodeB is smaller than the sum of VS.LC.ULCreditUsed.Mean for all cells under thisNodeB.

l Access failure rate caused by uplink CE resource congestionAfter CE Overbooking is activated on a network with a low average HSUPA throughput,the access failure rate caused by CE resource congestion decreases. The access failure rateis obtained by calculating the following failure rates: PS RAB setup failure rate CS RAB setup failure rate RRC connection setup failure rate caused by uplink CE resource congestion

These failure rates can be calculated using the following methods:The PS RAB setup failure rate caused by uplink CE resource congestion is calculatedusing the following formula: VS.RAB.FailEstabPS.ULCE.Cong/(VS.RAB.AttEstabPS.Conv + VS.RAB.AttEstabPS.Bkg + VS.RAB.AttEstabPS.Int +VS.RAB.AttEstabPS.Str)Counters in this formula are described in the following table.



25

Counter DescriptionVS. RAB.FailEstabPS.ULCE.Cong Number of Failed PS RAB

Establishments for Cell (UL CECongestion)

VS.RAB.AttEstabPS.Conv Number of PS Conversational RABEstablishment Attempts for Cell

VS.RAB.AttEstabPS.Bkg Number of PS Background RABEstablishment Attempts for Cell

VS.RAB.AttEstabPS.Int Number of PS Interactive RABEstablishment Attempts for Cell

VS.RAB.AttEstabPS.Str Number of PS Streaming RABEstablishment Attempts for Cell

The CS RAB setup failure rate caused by uplink CE resource congestion is calculatedusing the following formula: VS.RAB.FailEstabCS.ULCE.Cong/(VS.RAB.AttEstabCS.Conv + VS.RAB.AttEstabCS.Str)Counters in this formula are described in the following table.

Counter DescriptionVS. RAB.FailEstabCS.ULCE.Cong Number of Failed CS RAB

Establishments for Cell (UL CECongestion)

VS.RAB.AttEstabCS.Conv Number of CS Conversational RABEstablishment Requests for Cell

VS.RAB.AttEstabCS.Str Number of CS Streaming RABEstablishment Requests for Cell

The RRC connection setup failure rate caused by uplink CE resource congestion iscalculated using the following formula: VS.RRC.Rej.ULCE.Cong/VS.RRC.AttConnEstab.SumCounters in this formula are described in the following table.

Counter DescriptionVS.RRC.Rej.ULCE.Cong Number of RRC Connection Rejects for

Cell (UL CE Resource Congestion)VS.RRC.AttConnEstab.Sum Number of Processed RRC Connection

Requests for Cell

l Local cell group credit utilization



26

Table 10-3 lists local cell group (LCG)-level credit utilization when CE Overbooking takeseffect. The larger the value of a counter, the more severe the LCG-level credit congestionis.

Table 10-3 Counters measuring the LCG-level credit utilizationCounter DescriptionVS.LCG.ULCreditUsage.Mean LCG-level uplink average credit

utilization for a cell when CE Overbookingtakes effect

VS.LCG.ULCreditUsage.Max LCG-level uplink maximum creditutilization for a cell when CE Overbookingtakes effect

l Number of HSUPA UEs using the 2 ms TTI

After activating CE Overbooking on a network with a low average HSUPA throughput,check the counters in Table 10-4 to determine whether the number of HSUPA UEs usingthe 2 ms TTI increases.

Table 10-4 Counters measuring the average number of HSUPA UEs using the 2 ms TTICounter DescriptionVS.HSUPA.UE.Mean.TTI2ms Average number of HSUPA UEs using the

2 ms TTIVS.HSUPA.UE.Mean.Cell Average Number of HSUPA UEs in a CellVS.CellDCHUEs Number of UEs in CELL_DCH State for

Cell

l LDR events caused by CE congestionAfter activating CE Overbooking on a network with a low average HSUPA throughput,check the counter in Table 10-5 to determine whether the number of LDR events causedby CE congestion decreases.

Table 10-5 Counter measuring the number of LDR events caused by CE congestionCounter DescriptionVS.LCC.LDR.Num.ULCE Number of Times a Cell Is in LDR State

Due to UL CE Resource Congestion forCell

l Load on the Uu interface

After activating CE Overbooking on a network with a low average HSUPA throughput,check the counter in Table 10-6 to determine whether the load on the Uu interface increases.



27

Table 10-6 Counter measuring the mean received total wideband power in the cellCounter DescriptionVS.MeanRTWP Mean Power of Total Received Bandwidth

for Cell

l Average cell throughputAfter activating CE Overbooking on a network with a low average HSUPA throughput andsufficient Uu and Iub resources, check the counter in Table 10-7 to determine whether theaverage cell throughput increases.

Table 10-7 Counter measuring the average cell throughputCounter DescriptionVS.HSUPA.Thruput.ROTAll/(SP*60)(SP is the measurement period, with theunit of minute)

Average Throughput of HSUPA Users forCell

l Soft handover success rateAfter CE Overbooking is activated, statistics on the consumed admission CEs may beinconsistent between the RNC and the NodeB. The CEs reserved for soft handovers may beconsumed by the admitted UEs. Therefore, the probability of a decrease in the success rate ofthe soft handover is low. In most cases, network performance is not affected.

Table 10-8 Counters measuring the soft handover success rateCounter DescriptionVS.SHO.SuccRLAdd Number of Successful Radio Link Additions

in Soft Handover for CellVS.SHO.SuccRLDel Number of Successful Radio Link Deletions

in Soft Handover for CellVS.SHO.AttRLAdd Number of Radio Link Addition Attempts in

Soft Handover for CellVS.SHO.AttRLDel Number of Radio Link Deletion Attempts in

Soft Handover for Cell

l HSUPA call drop rateActivating CE Overbooking enables the network to admit more UEs. If the UEs on the networkinitiate data transmission simultaneously, CE resources may become insufficient. As a result,the HSUPA UEs experience increased call drops.



28

Table 10-9 Counters measuring the HSUPA call drop rateCounter DescriptionVS.HSUPA.RAB.AbnormRel Number of HSUPA RABs Abnormal

Releases for CellVS.HSUPA.RAB.AbnormRel.E2P Number of RABs Abnormally Released for

PS HSUPA Services during the StateTransition from CELL_DCH to CELL_PCHor URA_PCH for Cell

VS.HSUPA.RAB.AbnormRel Number of HSUPA RABs AbnormalReleases for Cell

VS.HSUPA.RAB.NormRel Number of HSUPA RABs Normal Releasesfor Cell

VS.HSUPA.HHO.E2D.SuccOutIntraFreq Number of Successful HSUPA Intra-Frequency Hard Handovers for Cell(EDCHto DCH)

VS.HSUPA.HHO.E2D.SuccOutInterFreq Number of Successful HSUPA Inter-Frequency Hard Handovers for Cell(EDCHto DCH)

VS.HSUPA.E2F.Succ Number of Successful Channel Conversionsfrom EDCH to FACH for HSUPA Service forCell

VS.HSUPA.E2D.Succ Number of Successful Channel Conversionsfrom EDCH to DCH for HSUPA Service forCell

VS.HSUPA.E2P.Succ Number of Successful Times That a UEPerforming HSUPA Services Transits toCELL_PCH or URA_PCH State for cell

l Admission rejections on the Iub interfaceActivating CE Overbooking increases the RAB setup success rate. However, statistics on theconsumed admission CEs may be inconsistent between the RNC and the NodeB after CEOverbooking is activated. There is a possibility that some UEs are admitted by the RNC but failto be admitted by the NodeB. Therefore, admission rejections on the Iub interface increase.

Table 10-10 Counters measuring admission rejections on the Iub interfaceCounter DescriptionRLM.FailRLAddIub.Cong Number of Iub Interface Radio Link Addition

Failures for Cell (Congestion)



29

Counter DescriptionVS.IUB.FailRLRecfg.Cong Number of Iub Interface Radio Link

Synchronous Reconfiguration Failures forCell (Congestion)

RLM.FailRLSetupIub.Cong Number of Iub Interface Radio Link SetupFailures for Cell (Congestion)

10.5 Parameter OptimizationIf the call drop rate increases due to insufficient CE resources after this feature is enabled, it isrecommended that CERSVFOR2MSUSER be set to a larger value.

10.6 TroubleshootingNone



30

11 ParametersTable 11-1 Parameter description

Parameter ID

NE MMLCommand

FeatureID

FeatureName

Description

CERSVFOR2MSUSER

BTS3900,BTS3900WCDMA

SETNODEBALGPARALSTNODEBALGPARA

WRFD-140212

CEOverbooking

Meaning: Indicates the minimum number of CEs foradmitting 2 ms users when CE Overbooking is enabled.GUI Value Range: 1~8Unit: NoneActual Value Range: 1~8Default Value: 4

WCDMA RANCE Overbooking Feature Parameter Description 11 Parameters


31

Parameter ID

NE MMLCommand

FeatureID

FeatureName

Description

PerfEnhanceSwitch

BSC6900

SETUCORRMPARA

WRFD-01061004WRFD-021104WRFD-01061404WRFD-140102WRFD-02060501WRFD-010202WRFD-02040003WRFD-020402WRFD-020400WRFD-010636

HSDPAPowerControlEmergency CallHSUPA2ms/10msTTIHandoverCSFallbackGuarantee forLTEEmergencyCallsSRNSRelocation (UENotInvolved)UE StateinConnected Mode(CELL-DCH,CELL-PCH,URA-PCH,CELL-FACH)InterSystemRedirectMeasurementBasedDirectRetry

Meaning: 1. PERFENH_AMR_SPEC_BR_SWITCH:When this switch is turned on, the procedure specific toAMR service establishment takes effect. 2.PERFENH_AMR_TMPLT_SWITCH: When thisswitch is turned on, the AMR template takes effect. 3.PERFENH_SRB_TMPLT_SWITCH: When thisswitch is turned on, the SRB template takes effect. 4.PERFENH_OLPC_TMPLT_SWITCH: When thisswitch is turned on, the OLPC template takes effect. 5.PERFENH_AMR_SP_TMPLT_SWITCH: When thisswitch is turned on, the AMR parameter template takeseffect. 6.PERFENH_INTRAFREQ_MC_TMPLT_SWITCH:When this switch is turned on, the intra-frequencymeasurement control template takes effect. 7.PERFENH_INTERRAT_PENALTY_50_SWITCH:After a UE fails to be handed over to a 2G cell duringan inter-RAT handover, the RNC forbids the UE toattempt a handover to the 2G cell in a certain period.When this switch is turned on, the period is 50s. Whenthis switch is turned off, the period is 30s. 8.PERFENH_SRB_OVER_HSUPA_TTI10_SWITCH:When this switch is turned on, the uplink SRBs ofHSUPA 10 ms non-conversational services are alwayscarried on DCHs, and the original parameter Type ofChannel Preferably Carrying Signaling RB is invalid.When this switch is turned off, SRBs for HSUPA 10 msnon-conversational services can be carried on HSUPAchannels when the original parameter Type of ChannelPreferably Carrying Signaling RB is set to HSUPA orHSPA. The switch is set to OFF by default. 9.PERFENH_HSUPA_TTI2_ENHANCE_SWITCH:When this switch is turned on, the single-user peak-rateimprovement algorithm of HSUPA 2 ms TTI is enabled.When this switch is turned off, the algorithm is disabled.The switch is set to OFF by default. 10.PERFENH_UU_P2D_CUC_OPT_SWITCH: Whenthis switch is turned on, the P2D cell update confirmmessage simplification algorithm takes effect. Whenthis switch is turned off, the algorithm does not takeeffect. By default, this switch is turned off. 11.PERFENH_RL_RECFG_SIR_CONSIDER_SWITCH: This check box controls whether the RNC considersthe converged SIRTarget value that is used before radiolink reconfiguration in outer loop power controlperformed after radio link reconfiguration. If the checkbox is not selected, the RNC sends the initial SIRTarget



32

Parameter ID

NE MMLCommand

FeatureID

FeatureName

Description

DRDIntroductionPackageSRBoverHSUPA

value used after radio link reconfiguration to theNodeB.If the check box is selected, the RNC selects amore appropriate value from the initial SIRTarget valueused after radio link reconfiguration and the convergedSIRTarget value used before radio link reconfiguration.Then the RNC sends the selected value to the NodeB.Setting of this check box takes effect only when thePC_RL_RECFG_SIR_TARGET_CARRY_SWITCHcheck box is selected. 12.PERFENH_RRC_REDIR_PROTECT_SWITCH:When this switch is turned on, The mechanism to avoidendless back-and-forth RRC-redirections takes effect.The switch is set to OFF by default. 13.PERFENH_H2F_OPT_SWITCH: whether to enablethe optimized algorithm for HSPA UE state transitionfrom CELL_DCH to CELL_FACH (also referred to asH2F state transition). When the switch is turned on, theoptimized H2F state transition algorithm is enabled, andevent 4A measurement of traffic volume or throughputis added to the state transition procedure. The addedevent 4A measurement prevents an H2F state transitionwhen data is being transmitted. 14.PERFENH_PSTRAFFIC_P2H_SWITCH: When theswitch is turned on and a CELL_PCH/URA_PCH-to-CELL_DCH (P2D for short) state transition is triggeredfor a PS service, the PS service can be set up on HSPAchannels after the state transition. When the switch isturned off, PS services can be set up only on DCHs aftera P2D state transition. This switch is turned off bydefault. 15.PERFENH_VIP_USER_PCHR_MR_SWITCH:When this switch is turned on, VIP UEs report theirtransmit power to the RNC when required andperiodically measure signal quality of intra-frequencycells. In addition, these UEs measure the downlinkBLER, the NodeB measures the uplink SIR, and theRNC records the measurement results. 16.PERFENH_TX_INTERRUPT_AFT_TRIG_SWITCH: Switch for including the Tx interruption after triggerIE in the uplink 4A traffic volume measurement controlmessage. When this switch is turned on, the uplink 4Atraffic volume measurement control message from RNCincludes the Tx interruption after trigger IE for UEs thatare in the CELL_FACH or enhanced CELL_FACHstate and processing PS BE services. The value of thisIE can be changed by running the "SETUUESTATETRANS" command. 17.



33

Parameter ID

NE MMLCommand

FeatureID

FeatureName

Description

PERFENH_CELL_HSUPA_CAP_CHANGE_OPT_SWITCH: The NodeB baseband board uses differentprocessing specifications for users with different uplinkbearer services, for example, HSUPA TTI 2 msservices, HSUPA TTI 10 ms services, and R99 services.When serving a large number of users, the systemcannot guarantee that all users can access the networkwith the highest service bearer supported by UEs. Thisswitch controls whether the RNC allocatescorresponding channels for new users based on the cellcapability reported through the NodeB private interface.When this switch is turned on, the RNC dynamicallyselects an appropriate uplink service bearer andallocates corresponding channels for new users tomaximize the system capacity based on the actualNodeB processing specifications. When this switch isturned off, the optimization process is disabled. 18.PERFENH_HSUPA_TTI_RECFG_PROC_OPT_SWITCH: Whether to use the optimized TTI switchingalgorithm for BE services When this switch is turnedoff, the optimized algorithm does not take effect. Theoriginal mechanism is implemented. When this switchis turned on, the optimized algorithm takes effect. AfterHSUPA services are configured or reconfigured with 10ms TTI due to network resource (admission CEs,RTWP, consumed Iub bandwidth, or consumed CEs)congestion or insufficient coverage, these UEs cannotchange to use 2 ms TTI if no data needs to betransmitted. 19.PERFENH_DOWNLOAD_ENHANCE_SWITCH:Whether to activate the algorithm for increasing thesingle-threaded download rate. 20.PERFENH_OLPC_BLER_COEF_ADJUST: Switchfor adjusting the BLER coefficient specific to CSservices based on the best cell's uplink load status. Whenthis switch is turned on, the outer loop power controlalgorithm uses the target BLER set by the OMU boardif the best cell's uplink load status is LDR or OLC. If thestatus is neither LDR nor OLC, this algorithm uses thistarget BLER after being divided by five. 21.PERFENH_EMG_AGPS_MC_DELAY_SWITCH:Whether to enable the function of delaying the sendingof an RRC_MEAS_CTRL message containing AGPSinformation when an emergency call is made. When thisswitch is turned on, the RNC delays the sending of thismessage until the emergency call is successfully set up.When this switch is turned off, the RNC sends this



34

Parameter ID

NE MMLCommand

FeatureID

FeatureName

Description

message upon receiving aLOCATION_REPORTING_CONTROL messagefrom the CN. 22.PERFENH_MULTI_RLS_CQI_PARA_OPT_SWITCH: Whether to enable a UE having multiple RLSs to usethe value of "CQIReF" and the value of "CQIFbCk" thatare for UEs having only one RLS. The two parameterscan be set by running the "SET UHSDPCCH" and"ADD UCELLHSDPCCH" commands. When thisswitch is turned off, the UE does not use the values ofthe two parameters that are for UEs having only oneRLS. When this switch is turned on, the UE uses thevalues of the two parameters that are for UEs havingonly one RLS. 23.PERFENH_RELOC_IE_CALCTIMEFORCIP_SWITCH: Whether to enable a RELOCATION REQUIREDmessage to contain the IE calculationTimeForCipher-ing. When this switch is turned on, static relocationrequest messages contain the IE calculationTimeForCi-phering. 24.PERFENH_IS_TIMEOUT_TRIG_DRD_SWITCH:Whether to trigger the DRD procedure and channelswitchover from E-DCH or HS-DSCH to DCH whenmessages transmitted over the Uu and Iub interfaces donot arrive in time. When this switch is turned off, theDRD procedure and channel switchover from E-DCHor HS-DSCH to DCH are not triggered if messagestransmitted over the Uu and Iub interfaces do not arrivein time. When this switch is turned on, the DRDprocedure and channel switchover from E-DCH or HS-DSCH to DCH are triggered if messages transmittedover the Uu and Iub interfaces do not arrive in time. 25.PERFENH_CELL_CACLOAD_BROADCAST_AMEND: Whether to consider CE or code resource usagewhen determining the resource status of a cell whoseserving boards or CP sub-systems are different fromthose of its neighboring cells. When this switch is turnedon, the RNC determines the resource status of such acell based on power, CE, and code resource usage. Ifpower, CE, or code resources in a cell becomecongested, the RNC determines that the cell experiencesresource congestion. When this switch is turned off, theRNC determines the resource status of such a cell basedon power resource usage only. 26.PERFENH_MBDR_TARCELLSEL_OPT_SWITCH:When this switch is turned on, candidate cells are rankedby "InterFreqMeasQuantity" (in the "ADD



35

Parameter ID

NE MMLCommand

FeatureID

FeatureName

Description

UCELLMBDRINTERFREQ" command) for MBDR,and the cell with the best signal quality is selected as thetarget cell. When this switch is turned off, candidatecells are not ranked by InterFreqMeasQuantity forMBDR. 27.PERFENH_RRC_DRD_PREADMISSION_SWITCH: Whether the RNC makes a pre-admission decision onintra-RAT DRDs or redirections during an RRCconnection setup. When this switch is turned on, theRNC makes a pre-admission decision on intra-RATDRDs or redirections during an RRC connection setup.When this switch is turned off, the RNC does not makea pre-admission decision on intra-RAT DRDs orredirections during an RRC connection setup. 28.PERFENH_RRC_WEAK_REDIR_SWITCH:Whether to activate the RRC redirection in weakcoverage algorithm. When this switch is turned on, UEslocated in weak coverage are redirected to theneighboring GSM cell through RRC redirection. Whenthis switch is turned off, this algorithm is disabled. 29.PERFENH_L2U_CSFB_COMMCALL_SWITCH:Whether to preferentially admit PS services of UEsinvolved in LTE-to-UMTS CS fallback. When thisswitch is turned on: If a UE involved in a LTE-to-UMTSCS fallback is processing a non-real-time PS service,the channel type and initial data rate for the PS serviceare determined by the "NRTInitRateforL2U" parameterin the "SET UFRC" command during serviceadmission. If the UE is processing a real-time PSservice, the UE follows the standard access procedure.If the access attempt fails and the "PreemptAlgoSwitch"in the "SET UQUEUEPREEMPT" command is turnedon, the UE can preempt radio resources of existing UEsin the UMTS cell. When this switch is turned off, theUE follows the standard access procedure for the PSservice. 30.PERFENH_DLBLINDDETECT_WHEN_ONLYSR-BONDCH: This parameter controls whether to enableblind detection for the HSDPA user-associated single-signaling R99 channel. When the switch specified bythis parameter is turned on, blind detection is enabled.31.PERFENH_DLBLINDDETECT_WHEN_SRBAM-RONDCH: This parameter controls whether to enableblind detection for the HSDPA user-associated AMRR99 channel. When the switch specified by thisparameter is turned on, blind detection is enabled if the



36

Parameter ID

NE MMLCommand

FeatureID

FeatureName

Description

HSDPA service has been set up and there are signalingand AMR traffic carried on the R99 channel. 32.PERFENH_R6_HSUPA_TTI_10MSTO2MS_LIMIT:Whether to allow R6 UEs to switch from HSUPA 10 msto 2 ms TTI. When the switch is turned on, thisswitching is not allowed for R6 UEs. When the switchis turned off, this limit does not work. This parameter isan advanced parameter. To modify this parameter,contact Huawei Customer Service Center for technicalsupport.GUI Value Range:PERFENH_AMR_SPEC_BR_SWITCH,PERFENH_AMR_TMPLT_SWITCH,PERFENH_SRB_TMPLT_SWITCH,PERFENH_OLPC_TMPLT_SWITCH,PERFENH_AMR_SP_TMPLT_SWITCH,PERFENH_INTRAFREQ_MC_TMPLT_SWITCH,PERFENH_INTERRAT_PENALTY_50_SWITCH,PERFENH_SRB_OVER_HSUPA_TTI10_SWITCH,PERFENH_HSUPA_TTI2_ENHANCE_SWITCH,PERFENH_UU_P2D_CUC_OPT_SWITCH,PERFENH_RL_RECFG_SIR_CONSIDER_SWITCH, PERFENH_RRC_REDIR_PROTECT_SWITCH,PERFENH_H2F_OPT_SWITCH,PERFENH_PSTRAFFIC_P2H_SWITCH,PERFENH_VIP_USER_PCHR_MR_SWITCH,PERFENH_TX_INTERRUPT_AFT_TRIG_SWITCH,PERFENH_CELL_HSUPA_CAP_CHANGE_OPT_SWITCH,PERFENH_HSUPA_TTI_RECFG_PROC_OPT_SWITCH,PERFENH_DOWNLOAD_ENHANCE_SWITCH,PERFENH_OLPC_BLER_COEF_ADJUST,PERFENH_EMG_AGPS_MC_DELAY_SWITCH,PERFENH_MULTI_RLS_CQI_PARA_OPT_SWITCH,PERFENH_RELOC_IE_CALCTIMEFORCIP_SWITCH,PERFENH_IS_TIMEOUT_TRIG_DRD_SWITCH,PERFENH_CELL_CACLOAD_BROADCAST_AMEND,PERFENH_MBDR_TARCELLSEL_OPT_SWITCH,PERFENH_RRC_DRD_PREADMISSION_SWITCH, PERFENH_RRC_WEAK_REDIR_SWITCH,PERFENH_L2U_CSFB_COMMCALL_SWITCH,



37

Parameter ID

NE MMLCommand

FeatureID

FeatureName

Description

PERFENH_DLBLINDDETECT_WHEN_ONLYSR-BONDCH,PERFENH_DLBLINDDETECT_WHEN_SRBAM-RONDCH,PERFENH_R6_HSUPA_TTI_10MSTO2MS_LIMITUnit: NoneActual Value Range:PERFENH_AMR_SPEC_BR_SWITCH,PERFENH_AMR_TMPLT_SWITCH,PERFENH_SRB_TMPLT_SWITCH,PERFENH_OLPC_TMPLT_SWITCH,PERFENH_AMR_SP_TMPLT_SWITCH,PERFENH_INTRAFREQ_MC_TMPLT_SWITCH,PERFENH_INTERRAT_PENALTY_50_SWITCH,PERFENH_SRB_OVER_HSUPA_TTI10_SWITCH,PERFENH_HSUPA_TTI2_ENHANCE_SWITCH,PERFENH_UU_P2D_CUC_OPT_SWITCH,PERFENH_RL_RECFG_SIR_CONSIDER_SWITCH, PERFENH_RRC_REDIR_PROTECT_SWITCH,PERFENH_H2F_OPT_SWITCH,PERFENH_PSTRAFFIC_P2H_SWITCH,PERFENH_VIP_USER_PCHR_MR_SWITCH,PERFENH_TX_INTERRUPT_AFT_TRIG_SWITCH,PERFENH_CELL_HSUPA_CAP_CHANGE_OPT_SWITCH,PERFENH_HSUPA_TTI_RECFG_PROC_OPT_SWITCH,PERFENH_DOWNLOAD_ENHANCE_SWITCH,PERFENH_OLPC_BLER_COEF_ADJUST,PERFENH_EMG_AGPS_MC_DELAY_SWITCH,PERFENH_MULTI_RLS_CQI_PARA_OPT_SWITCH,PERFENH_RELOC_IE_CALCTIMEFORCIP_SWITCH,PERFENH_IS_TIMEOUT_TRIG_DRD_SWITCH,PERFENH_CELL_CACLOAD_BROADCAST_AMEND,PERFENH_MBDR_TARCELLSEL_OPT_SWITCH,PERFENH_RRC_DRD_PREADMISSION_SWITCH, PERFENH_RRC_WEAK_REDIR_SWITCH,PERFENH_L2U_CSFB_COMMCALL_SWITCH,PERFENH_DLBLINDDETECT_WHEN_ONLYSR-BONDCH,PERFENH_DLBLINDDETECT_WHEN_SRBAM-



38

Parameter ID

NE MMLCommand

FeatureID

FeatureName

Description

RONDCH,PERFENH_R6_HSUPA_TTI_10MSTO2MS_LIMITDefault Value:PERFENH_AMR_SPEC_BR_SWITCH:1,PERFENH_AMR_TMPLT_SWITCH:1,PERFENH_SRB_TMPLT_SWITCH:1,PERFENH_OLPC_TMPLT_SWITCH:1,PERFENH_AMR_SP_TMPLT_SWITCH:1,PERFENH_INTRAFREQ_MC_TMPLT_SWITCH:1,PERFENH_INTERRAT_PENALTY_50_SWITCH:1,PERFENH_SRB_OVER_HSUPA_TTI10_SWITCH:0,PERFENH_HSUPA_TTI2_ENHANCE_SWITCH:0,PERFENH_UU_P2D_CUC_OPT_SWITCH:0,PERFENH_RL_RECFG_SIR_CONSIDER_SWITCH:1,PERFENH_RRC_REDIR_PROTECT_SWITCH:0,PERFENH_H2F_OPT_SWITCH:0,PERFENH_PSTRAFFIC_P2H_SWITCH:0,PERFENH_VIP_USER_PCHR_MR_SWITCH:0,PERFENH_TX_INTERRUPT_AFT_TRIG_SWITCH:0,PERFENH_CELL_HSUPA_CAP_CHANGE_OPT_SWITCH:0,PERFENH_HSUPA_TTI_RECFG_PROC_OPT_SWITCH:0,PERFENH_DOWNLOAD_ENHANCE_SWITCH:0,PERFENH_OLPC_BLER_COEF_ADJUST:1,PERFENH_EMG_AGPS_MC_DELAY_SWITCH:0,PERFENH_MULTI_RLS_CQI_PARA_OPT_SWITCH:0,PERFENH_RELOC_IE_CALCTIMEFORCIP_SWITCH:0,PERFENH_IS_TIMEOUT_TRIG_DRD_SWITCH:0,PERFENH_CELL_CACLOAD_BROADCAST_AMEND:1,PERFENH_MBDR_TARCELLSEL_OPT_SWITCH:0,PERFENH_RRC_DRD_PREADMISSION_SWITCH:0,PERFENH_RRC_WEAK_REDIR_SWITCH:0,PERFENH_L2U_CSFB_COMMCALL_SWITCH:0,PERFENH_DLBLINDDETECT_WHEN_ON-LYSRBONDCH:0,PERFENH_DLBLINDDETECT_WHEN_SRBAM-RONDCH:0,PERFENH_R6_HSUPA_TTI_10MSTO2MS_LIM-IT:0



39

Parameter ID

NE MMLCommand

FeatureID

FeatureName

Description

PerfEnhanceSwitch

BSC6910

SETUCORRMPARA

WRFD-01061004WRFD-021104WRFD-01061404WRFD-140102WRFD-02060501WRFD-010202WRFD-02040003WRFD-020402WRFD-020400WRFD-010636

HSDPAPowerControlEmergency CallHSUPA2ms/10msTTIHandoverCSFallbackGuarantee forLTEEmergencyCallsSRNSRelocation (UENotInvolved)UE StateinConnected Mode(CELL-DCH,CELL-PCH,URA-PCH,CELL-FACH)InterSystemRedirectMeasurementBasedDirectRetry

Meaning: 1. PERFENH_AMR_SPEC_BR_SWITCH:When this switch is turned on, the procedure specific toAMR service establishment takes effect. 2.PERFENH_AMR_TMPLT_SWITCH: When thisswitch is turned on, the AMR template takes effect. 3.PERFENH_SRB_TMPLT_SWITCH: When thisswitch is turned on, the SRB template takes effect. 4.PERFENH_OLPC_TMPLT_SWITCH: When thisswitch is turned on, the OLPC template takes effect. 5.PERFENH_AMR_SP_TMPLT_SWITCH: When thisswitch is turned on, the AMR parameter template takeseffect. 6.PERFENH_INTRAFREQ_MC_TMPLT_SWITCH:When this switch is turned on, the intra-frequencymeasurement control template takes effect. 7.PERFENH_INTERRAT_PENALTY_50_SWITCH:After a UE fails to be handed over to a 2G cell duringan inter-RAT handover, the RNC forbids the UE toattempt a handover to the 2G cell in a certain period.When this switch is turned on, the period is 50s. Whenthis switch is turned off, the period is 30s. 8.PERFENH_SRB_OVER_HSUPA_TTI10_SWITCH:When this switch is turned on, the uplink SRBs ofHSUPA 10 ms non-conversational services are alwayscarried on DCHs, and the original parameter Type ofChannel Preferably Carrying Signaling RB is invalid.When this switch is turned off, SRBs for HSUPA 10 msnon-conversational services can be carried on HSUPAchannels when the original parameter Type of ChannelPreferably Carrying Signaling RB is set to HSUPA orHSPA. The switch is set to OFF by default. 9.PERFENH_HSUPA_TTI2_ENHANCE_SWITCH:When this switch is turned on, the single-user peak-rateimprovement algorithm of HSUPA 2 ms TTI is enabled.When this switch is turned off, the algorithm is disabled.The switch is set to OFF by default. 10.PERFENH_UU_P2D_CUC_OPT_SWITCH: Whenthis switch is turned on, the P2D cell update confirmmessage simplification algorithm takes effect. Whenthis switch is turned off, the algorithm does not takeeffect. By default, this switch is turned off. 11.PERFENH_RL_RECFG_SIR_CONSIDER_SWITCH: This check box controls whether the RNC considersthe converged SIRTarget value that is used before radiolink reconfiguration in outer loop power controlperformed after radio link reconfiguration. If the checkbox is not selected, the RNC sends the initial SIRTarget



40

Parameter ID

NE MMLCommand

FeatureID

FeatureName

Description

DRDIntroductionPackageSRBoverHSUPA

value used after radio link reconfiguration to theNodeB.If the check box is selected, the RNC selects amore appropriate value from the initial SIRTarget valueused after radio link reconfiguration and the convergedSIRTarget value used before radio link reconfiguration.Then the RNC sends the selected value to the NodeB.Setting of this check box takes effect only when thePC_RL_RECFG_SIR_TARGET_CARRY_SWITCHcheck box is selected. 12.PERFENH_RRC_REDIR_PROTECT_SWITCH:When this switch is turned on, The mechanism to avoidendless back-and-forth RRC-redirections takes effect.The switch is set to OFF by default. 13.PERFENH_H2F_OPT_SWITCH: whether to enablethe optimized algorithm for HSPA UE state transitionfrom CELL_DCH to CELL_FACH (also referred to asH2F state transition). When the switch is turned on, theoptimized H2F state transition algorithm is enabled, andevent 4A measurement of traffic volume or throughputis added to the state transition procedure. The addedevent 4A measurement prevents an H2F state transitionwhen data is being transmitted. 14.PERFENH_PSTRAFFIC_P2H_SWITCH: When theswitch is turned on and a CELL_PCH/URA_PCH-to-CELL_DCH (P2D for short) state transition is triggeredfor a PS service, the PS service can be set up on HSPAchannels after the state transition. When the switch isturned off, PS services can be set up only on DCHs aftera P2D state transition. This switch is turned off bydefault. 15.PERFENH_VIP_USER_PCHR_MR_SWITCH:When this switch is turned on, VIP UEs report theirtransmit power to the RNC when required andperiodically measure signal quality of intra-frequencycells. In addition, these UEs measure the downlinkBLER, the NodeB measures the uplink SIR, and theRNC records the measurement results. 16.PERFENH_TX_INTERRUPT_AFT_TRIG_SWITCH: Switch for including the Tx interruption after triggerIE in the uplink 4A traffic volume measurement controlmessage. When this switch is turned on, the uplink 4Atraffic volume measurement control message from RNCincludes the Tx interruption after trigger IE for UEs thatare in the CELL_FACH or enhanced CELL_FACHstate and processing PS BE services. The value of thisIE can be changed by running the "SETUUESTATETRANS" command. 17.



41

Parameter ID

NE MMLCommand

FeatureID

FeatureName

Description

PERFENH_CELL_HSUPA_CAP_CHANGE_OPT_SWITCH: The NodeB baseband board uses differentprocessing specifications for users with different uplinkbearer services, for example, HSUPA TTI 2 msservices, HSUPA TTI 10 ms services, and R99 services.When serving a large number of users, the systemcannot guarantee that all users can access the networkwith the highest service bearer supported by UEs. Thisswitch controls whether the RNC allocatescorresponding channels for new users based on the cellcapability reported through the NodeB private interface.When this switch is turned on, the RNC dynamicallyselects an appropriate uplink service bearer andallocates corresponding channels for new users tomaximize the system capacity based on the actualNodeB processing specifications. When this switch isturned off, the optimization process is disabled. 18.PERFENH_HSUPA_TTI_RECFG_PROC_OPT_SWITCH: Whether to use the optimized TTI switchingalgorithm for BE services When this switch is turnedoff, the optimized algorithm does not take effect. Theoriginal mechanism is implemented. When this switchis turned on, the optimized algorithm takes effect. AfterHSUPA services are configured or reconfigured with 10ms TTI due to network resource (admission CEs,RTWP, consumed Iub bandwidth, or consumed CEs)congestion or insufficient coverage, these UEs cannotchange to use 2 ms TTI if no data needs to betransmitted. 19.PERFENH_DOWNLOAD_ENHANCE_SWITCH:Whether to activate the algorithm for increasing thesingle-threaded download rate. 20.PERFENH_OLPC_BLER_COEF_ADJUST: Switchfor adjusting the BLER coefficient specific to CSservices based on the best cell's uplink load status. Whenthis switch is turned on, the outer loop power controlalgorithm uses the target BLER set by the OMU boardif the best cell's uplink load status is LDR or OLC. If thestatus is neither LDR nor OLC, this algorithm uses thistarget BLER after being divided by five. 21.PERFENH_EMG_AGPS_MC_DELAY_SWITCH:Whether to enable the function of delaying the sendingof an RRC_MEAS_CTRL message containing AGPSinformation when an emergency call is made. When thisswitch is turned on, the RNC delays the sending of thismessage until the emergency call is successfully set up.When this switch is turned off, the RNC sends this



42

Parameter ID

NE MMLCommand

FeatureID

FeatureName

Description

message upon receiving aLOCATION_REPORTING_CONTROL messagefrom the CN. 22.PERFENH_MULTI_RLS_CQI_PARA_OPT_SWITCH: Whether to enable a UE having multiple RLSs to usethe value of "CQIReF" and the value of "CQIFbCk" thatare for UEs having only one RLS. The two parameterscan be set by running the "SET UHSDPCCH" and"ADD UCELLHSDPCCH" commands. When thisswitch is turned off, the UE does not use the values ofthe two parameters that are for UEs having only oneRLS. When this switch is turned on, the UE uses thevalues of the two parameters that are for UEs havingonly one RLS. 23.PERFENH_RELOC_IE_CALCTIMEFORCIP_SWITCH: Whether to enable a RELOCATION REQUIREDmessage to contain the IE calculationTimeForCipher-ing. When this switch is turned on, static relocationrequest messages contain the IE calculationTimeForCi-phering. 24.PERFENH_IS_TIMEOUT_TRIG_DRD_SWITCH:Whether to trigger the DRD procedure and channelswitchover from E-DCH or HS-DSCH to DCH whenmessages transmitted over the Uu and Iub interfaces donot arrive in time. When this switch is turned off, theDRD procedure and channel switchover from E-DCHor HS-DSCH to DCH are not triggered if messagestransmitted over the Uu and Iub interfaces do not arrivein time. When this switch is turned on, the DRDprocedure and channel switchover from E-DCH or HS-DSCH to DCH are triggered if messages transmittedover the Uu and Iub interfaces do not arrive in time. 25.PERFENH_CELL_CACLOAD_BROADCAST_AMEND: Whether to consider CE or code resource usagewhen determining the resource status of a cell whoseserving boards or CP sub-systems are different fromthose of its neighboring cells. When this switch is turnedon, the RNC determines the resource status of such acell based on power, CE, and code resource usage. Ifpower, CE, or code resources in a cell becomecongested, the RNC determines that the cell experiencesresource congestion. When this switch is turned off, theRNC determines the resource status of such a cell basedon power resource usage only. 26.PERFENH_MBDR_TARCELLSEL_OPT_SWITCH:When this switch is turned on, candidate cells are rankedby "InterFreqMeasQuantity" (in the "ADD



43

Parameter ID

NE MMLCommand

FeatureID

FeatureName

Description

UCELLMBDRINTERFREQ" command) for MBDR,and the cell with the best signal quality is selected as thetarget cell. When this switch is turned off, candidatecells are not ranked by InterFreqMeasQuantity forMBDR. 27.PERFENH_RRC_DRD_PREADMISSION_SWITCH: Whether the RNC makes a pre-admission decision onintra-RAT DRDs or redirections during an RRCconnection setup. When this switch is turned on, theRNC makes a pre-admission decision on intra-RATDRDs or redirections during an RRC connection setup.When this switch is turned off, the RNC does not makea pre-admission decision on intra-RAT DRDs orredirections during an RRC connection setup. 28.PERFENH_RRC_WEAK_REDIR_SWITCH:Whether to activate the RRC redirection in weakcoverage algorithm. When this switch is turned on, UEslocated in weak coverage are redirected to theneighboring GSM cell through RRC redirection. Whenthis switch is turned off, this algorithm is disabled. 29.PERFENH_L2U_CSFB_COMMCALL_SWITCH:Whether to preferentially admit PS services of UEsinvolved in LTE-to-UMTS CS fallback. When thisswitch is turned on: If a UE involved in a LTE-to-UMTSCS fallback is processing a non-real-time PS service,the channel type and initial data rate for the PS serviceare determined by the "NRTInitRateforL2U" parameterin the "SET UFRC" command during serviceadmission. If the UE is processing a real-time PSservice, the UE follows the standard access procedure.If the access attempt fails and the "PreemptAlgoSwitch"in the "SET UQUEUEPREEMPT" command is turnedon, the UE can preempt radio resources of existing UEsin the UMTS cell. When this switch is turned off, theUE follows the standard access procedure for the PSservice. 30.PERFENH_DLBLINDDETECT_WHEN_ONLYSR-BONDCH: This parameter controls whether to enableblind detection for the HSDPA user-associated single-signaling R99 channel. When the switch specified bythis parameter is turned on, blind detection is enabled.31.PERFENH_DLBLINDDETECT_WHEN_SRBAM-RONDCH: This parameter controls whether to enableblind detection for the HSDPA user-associated AMRR99 channel. When the switch specified by thisparameter is turned on, blind detection is enabled if the



44

Parameter ID

NE MMLCommand

FeatureID

FeatureName

Description

HSDPA service has been set up and there are signalingand AMR traffic carried on the R99 channel. 32.PERFENH_R6_HSUPA_TTI_10MSTO2MS_LIMIT:Whether to allow R6 UEs to switch from HSUPA 10 msto 2 ms TTI. When the switch is turned on, thisswitching is not allowed for R6 UEs. When the switchis turned off, this limit does not work. This parameter isan advanced parameter. To modify this parameter,contact Huawei Customer Service Center for technicalsupport.GUI Value Range:PERFENH_AMR_SPEC_BR_SWITCH,PERFENH_AMR_TMPLT_SWITCH,PERFENH_SRB_TMPLT_SWITCH,PERFENH_OLPC_TMPLT_SWITCH,PERFENH_AMR_SP_TMPLT_SWITCH,PERFENH_INTRAFREQ_MC_TMPLT_SWITCH,PERFENH_INTERRAT_PENALTY_50_SWITCH,PERFENH_SRB_OVER_HSUPA_TTI10_SWITCH,PERFENH_HSUPA_TTI2_ENHANCE_SWITCH,PERFENH_UU_P2D_CUC_OPT_SWITCH,PERFENH_RL_RECFG_SIR_CONSIDER_SWITCH, PERFENH_RRC_REDIR_PROTECT_SWITCH,PERFENH_H2F_OPT_SWITCH,PERFENH_PSTRAFFIC_P2H_SWITCH,PERFENH_VIP_USER_PCHR_MR_SWITCH,PERFENH_TX_INTERRUPT_AFT_TRIG_SWITCH,PERFENH_CELL_HSUPA_CAP_CHANGE_OPT_SWITCH,PERFENH_HSUPA_TTI_RECFG_PROC_OPT_SWITCH,PERFENH_DOWNLOAD_ENHANCE_SWITCH,PERFENH_OLPC_BLER_COEF_ADJUST,PERFENH_EMG_AGPS_MC_DELAY_SWITCH,PERFENH_MULTI_RLS_CQI_PARA_OPT_SWITCH,PERFENH_RELOC_IE_CALCTIMEFORCIP_SWITCH,PERFENH_IS_TIMEOUT_TRIG_DRD_SWITCH,PERFENH_CELL_CACLOAD_BROADCAST_AMEND,PERFENH_MBDR_TARCELLSEL_OPT_SWITCH,PERFENH_RRC_DRD_PREADMISSION_SWITCH, PERFENH_RRC_WEAK_REDIR_SWITCH,PERFENH_L2U_CSFB_COMMCALL_SWITCH,



45

Parameter ID

NE MMLCommand

FeatureID

FeatureName

Description

PERFENH_DLBLINDDETECT_WHEN_ONLYSR-BONDCH,PERFENH_DLBLINDDETECT_WHEN_SRBAM-RONDCH,PERFENH_R6_HSUPA_TTI_10MSTO2MS_LIMITUnit: NoneActual Value Range:PERFENH_AMR_SPEC_BR_SWITCH,PERFENH_AMR_TMPLT_SWITCH,PERFENH_SRB_TMPLT_SWITCH,PERFENH_OLPC_TMPLT_SWITCH,PERFENH_AMR_SP_TMPLT_SWITCH,PERFENH_INTRAFREQ_MC_TMPLT_SWITCH,PERFENH_INTERRAT_PENALTY_50_SWITCH,PERFENH_SRB_OVER_HSUPA_TTI10_SWITCH,PERFENH_HSUPA_TTI2_ENHANCE_SWITCH,PERFENH_UU_P2D_CUC_OPT_SWITCH,PERFENH_RL_RECFG_SIR_CONSIDER_SWITCH, PERFENH_RRC_REDIR_PROTECT_SWITCH,PERFENH_H2F_OPT_SWITCH,PERFENH_PSTRAFFIC_P2H_SWITCH,PERFENH_VIP_USER_PCHR_MR_SWITCH,PERFENH_TX_INTERRUPT_AFT_TRIG_SWITCH,PERFENH_CELL_HSUPA_CAP_CHANGE_OPT_SWITCH,PERFENH_HSUPA_TTI_RECFG_PROC_OPT_SWITCH,PERFENH_DOWNLOAD_ENHANCE_SWITCH,PERFENH_OLPC_BLER_COEF_ADJUST,PERFENH_EMG_AGPS_MC_DELAY_SWITCH,PERFENH_MULTI_RLS_CQI_PARA_OPT_SWITCH,PERFENH_RELOC_IE_CALCTIMEFORCIP_SWITCH,PERFENH_IS_TIMEOUT_TRIG_DRD_SWITCH,PERFENH_CELL_CACLOAD_BROADCAST_AMEND,PERFENH_MBDR_TARCELLSEL_OPT_SWITCH,PERFENH_RRC_DRD_PREADMISSION_SWITCH, PERFENH_RRC_WEAK_REDIR_SWITCH,PERFENH_L2U_CSFB_COMMCALL_SWITCH,PERFENH_DLBLINDDETECT_WHEN_ONLYSR-BONDCH,PERFENH_DLBLINDDETECT_WHEN_SRBAM-



46

Parameter ID

NE MMLCommand

FeatureID

FeatureName

Description

RONDCH,PERFENH_R6_HSUPA_TTI_10MSTO2MS_LIMITDefault Value:PERFENH_AMR_SPEC_BR_SWITCH:1,PERFENH_AMR_TMPLT_SWITCH:1,PERFENH_SRB_TMPLT_SWITCH:1,PERFENH_OLPC_TMPLT_SWITCH:1,PERFENH_AMR_SP_TMPLT_SWITCH:1,PERFENH_INTRAFREQ_MC_TMPLT_SWITCH:1,PERFENH_INTERRAT_PENALTY_50_SWITCH:1,PERFENH