Hsupa Tti Selection (Ran15.0_04)

WCDMA RAN

HSUPA TTI Selection FeatureParameter Description

Issue 04Date 2014-03-31

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

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

Issue 04 (2014-03-31) 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.......................................................................................................................32 Overview.........................................................................................................................................43 Initial TTI Selection During Service Setup or Reconfiguration..........................................54 Dynamic TTI Adjustment..........................................................................................................104.1 Overview......................................................................................................................................................................114.2 Dynamic TTI Adjustment for a Single Voice Service over HSUPA...........................................................................144.3 Coverage-based Dynamic TTI Adjustment for a Single BE Service over HSUPA.....................................................164.4 Differentiation-based Dynamic TTI Adjustment for a Single BE Service over HSUPA.............................................184.5 Admission-CE-based Dynamic TTI Adjustment for a Single BE Service over HSUPA.............................................194.6 Dynamic TTI Adjustment for Combined Services over HSUPA.................................................................................205 Engineering Guidelines.............................................................................................................225.1 Deployment of Dynamic TTI Adjustment for a Single Voice Service over HSUPA..................................................235.1.1 Requirements.............................................................................................................................................................235.1.2 Precautions.................................................................................................................................................................235.1.3 Activation..................................................................................................................................................................235.1.4 Activation Observation..............................................................................................................................................245.1.5 Deactivation...............................................................................................................................................................265.2 Deployment of Coverage-based Initial TTI Selection and Dynamic TTI Adjustment for a Single BE Service overHSUPA...............................................................................................................................................................................275.2.1 Requirements.............................................................................................................................................................275.2.2 Precautions.................................................................................................................................................................285.2.3 Activation..................................................................................................................................................................285.2.4 Activation Observation..............................................................................................................................................325.2.5 Deactivation...............................................................................................................................................................345.3 Deployment of Differentiation-based Initial TTI Selection and Dynamic TTI Adjustment for a Single BE Service overHSUPA...............................................................................................................................................................................365.3.1 Requirements.............................................................................................................................................................37

WCDMA RANHSUPA TTI Selection Feature Parameter Description Contents


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5.3.2 Precautions.................................................................................................................................................................375.3.3 Activation..................................................................................................................................................................375.3.4 Activation Observation..............................................................................................................................................425.3.5 Deactivation...............................................................................................................................................................455.4 Deployment of Admission-CE-based Initial TTI Selection and Dynamic TTI Adjustment for a Single BE Service overHSUPA...............................................................................................................................................................................475.4.1 Requirements.............................................................................................................................................................475.4.2 Precautions.................................................................................................................................................................475.4.3 Activation..................................................................................................................................................................485.4.4 Activation Observation..............................................................................................................................................525.4.5 Deactivation...............................................................................................................................................................546 Parameters.....................................................................................................................................567 Counters......................................................................................................................................1558 Glossary.......................................................................................................................................1589 Reference Documents...............................................................................................................159

WCDMA RANHSUPA TTI Selection Feature Parameter Description Contents


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1 About This Document1.1 Scope

This document describes WRFD-010690 TTI Switch for BE Services Based on Coverage,including its technical principles and engineering guidelines.

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:l Feature change

Changes in features and parameters of a specified version as well as the affected entitiesl Editorial change

Changes in wording or addition of information and any related parameters affected byeditorial changes. Editorial change does not specify the affected entities

RAN15.0 04 (2014-03-31)This issue includes the following changes.

ChangeType

Change Description ParameterChange

Featurechange

None None

WCDMA RANHSUPA TTI Selection Feature Parameter Description 1 About This Document


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ChangeType


Editorialchange

Added parameter settings for HSUPA initial TTIselection. For details, see 3 Initial TTI SelectionDuring Service Setup or Reconfiguration and 5Engineering Guidelines.

None


ChangeType


Featurechange

None None

Editorialchange

Modified 4.4 Differentiation-based Dynamic TTIAdjustment for a Single BE Service over HSUPA and4.5 Admission-CE-based Dynamic TTI Adjustment fora Single BE Service over HSUPA.

None


ChangeType


Featurechange

None None

Editorialchange

Optimized 3 Initial TTI Selection During ServiceSetup or Reconfiguration.

None

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

RAN15.0 Draft A(2013-01-30)Compared with Issue 02 (2012-07-20) for RAN14.0, Draft A (2013-01-30) of RAN15.0 includesthe following changes.



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Change Type Change Description Parameter ChangeFeature change None NoneEditorial change Added descriptions of the follow-up

processing for HSUPA TTI selectionfailures. For details, see 2 Overview.

None

Modified descriptions of the CME-basedconfiguration. For details, see 5Engineering Guidelines.

None

1.4 Differences Between Base Station Types



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2 OverviewThe TTI for an HSUPA service can be 2 ms or 10 ms. Different TTIs provide different benefits:l When the TTI is 2 ms, a higher throughput can be achieved. If SRB over HSUPA is used,

the theoretical uplink peak throughput can reach 5.74 Mbit/s over the Uu interface. If SRBover DCH is used, the theoretical uplink peak throughput can reach 2.88 Mbit/s over theUu interface. However, when the TTI is 10 ms, the theoretical uplink peak throughput canonly reach 2 Mbit/s over the Uu interface.

l When the TTI is 10 ms, interleaving brings more gains and less power is consumed.Therefore, wider coverage can be achieved.

The HSUPA TTI Selection function enables the switchover between 2 ms TTI and 10 ms TTI,which reduces the call drop rate and ensures the quality of service (QoS).The HSUPA TTI Selection function enables the RNC to:l Set the TTI according to the configured TTI selection rules when an HSUPA service is

being set up or reconfigured. For details, see 3 Initial TTI Selection During Service Setupor Reconfiguration.

l Adjust the TTI for voice services and best effort (BE) services over HSUPA based oncoverage, service differentiation, and NodeB credit resources. For details, see 4 DynamicTTI Adjustment.

If data transmission is abnormal over the Uu interface or a UE sends the RNC a Radio BearerSetup Failure or Radio Link Reconfiguration Failure message during the HSUPA TTI selectionprocess, the UE acts as follows:l In case of abnormal data transmission over the Uu interface, the call is dropped on the UE.l After sending the RNC a Radio Bearer Setup Failure or Radio Link Reconfiguration Failure

message, the UE retains the current state.

WCDMA RANHSUPA TTI Selection Feature Parameter Description 2 Overview


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3 Initial TTI Selection During Service Setup orReconfiguration

This chapter describes the algorithms used to select the TTI for UEs that have established anRRC connection. The RNC determines the TTI according to the rules described in Table 3-1 inthe following scenarios:l An HSUPA RAB is being set up or modifiedl The UE is transitioning from other connected state to the CELL_DCH state.l The HSPA/HSPA+ technology falls back due to handovers.

Table 3-1 Initial TTI selection for UEs with an RRC connectionService Type TTI SettingCS voice service The TTI is set to 2 ms when all the following conditions are met:

l Both the UE and the NodeB support the 2 ms TTI.l The MAP_HSUPA_TTI_2MS_SWITCH check box under the

MapSwitch(BSC6900,BSC6910) parameter is selected.l The CSVoiceHsupaTti(BSC6900,BSC6910) parameter is set to

EDCH_TTI_2ms.If any of the preceding conditions is not met, the TTI is set to 10 ms.

PS voice service The TTI is set to 2 ms when all the following conditions are met:l Both the UE and the NodeB support the 2 ms TTI.l The MAP_HSUPA_TTI_2MS_SWITCH check box under the

MapSwitch(BSC6900,BSC6910) parameter is selected.l The VoipHsupaTti(BSC6900,BSC6910) parameter is set to

EDCH_TTI_2ms.If any of the preceding conditions is not met, the TTI is set to 10 ms.For details about the TTI selection for the push to talk (PTT) servicecarried over an HSUPA channel, see Push to Talk FeatureParameter Description.

WCDMA RANHSUPA TTI Selection Feature Parameter Description



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Service Type TTI SettingPS streamingservice

The TTI is set to 2 ms when all the following conditions are met:l Both the UE and the NodeB support the 2 ms TTI.l The MAP_HSUPA_TTI_2MS_SWITCH check box under the

MapSwitch(BSC6900,BSC6910) parameter is selected.l The maximum bit rate (MBR) is higher than or equal to the value of

StreamHsupa2msTtiRateThs(BSC6900,BSC6910).If any of the preceding conditions is not met, the TTI is set to 10 ms.




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Service Type TTI SettingPS BE service(interactive orbackgroundservice)

The TTI is set to 2 ms when all the following conditions are met:l Both the UE and the NodeB support the 2 ms TTI.l The MAP_HSUPA_TTI_2MS_SWITCH check box under the

MapSwitch(BSC6900,BSC6910) parameter is selected.l The MBR is greater than or equal to the value of BeHsupa2msTtiRa-

teThs(BSC6900,BSC6910).l The NodeB credit resources must be sufficient when parameters are

configured as follows: The

PERFENH_BASE_ADM_CE_TTI2MS_LIMIT_SWITCHcheck box under the PERFENHANCESWITCH1(BSC6900,BSC6910) parameter is selected. The PS_RAB_DOWNSIZING_SWITCH check box under the

PsSwitch(BSC6900,BSC6910) parameter is selected. The RAB Downsizing at Admission Control license for the

WRFD-010507 Rate Negotiation at Admission Control featurehas been activated and the switch controlling this feature is setto on. For UEs using the UL Layer 2 Improvement feature, the

DRA_BASE_ADM_CE_BE_TTI_L2_OPT_SWITCH,DRA_DCCC_SWITCH, andDRA_BASE_ADM_CE_BE_TTI_RECFG_SWITCH checkboxes under the DraSwitch(BSC6900,BSC6910) parameter areselected.

l When parameters are configured as follows: The DRA_BASE_RES_BE_TTI_RECFG_SWITCH,

DRA_BASE_RES_BE_TTI_INIT_SEL_SWITCH andDRA_DCCC_SWITCH check boxes under the DraSwitch(BSC6900,BSC6910) parameter are selected; The PS_RAB_DOWNSIZING_SWITCH check box under the



DRA_BASE_RES_BE_TTI_L2_OPT_SWITCH check boxunder the DraSwitch(BSC6900,BSC6910) parameter isselected.

The following conditions must be met: If the RTWP check box under the ResourceOption

(BSC6900,BSC6910) parameter is selected, the Uu resources aresufficient.




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Service Type TTI Setting If the Iub check box under the ResourceOption

(BSC6900,BSC6910) parameter is selected, the Iub resourcesare sufficient. If the CE check box under the ResourceOption

(BSC6900,BSC6910) parameter is selected, the channel element(CE) resources are sufficient.

l When parameters are configured as follows: The DRA_BASE_COVER_BE_TTI_RECFG_SWITCH,

DRA_BASE_COVER_BE_TTI_INIT_SEL_SWITCH andDRA_DCCC_SWITCH check boxes under the DraSwitch(BSC6900,BSC6910) parameter are selected. The PS_RAB_DOWNSIZING_SWITCH check box under the



DRA_BASE_COVER_BE_TTI_L2_OPT_SWITCH checkbox under the DraSwitch(BSC6900,BSC6910) parameter isselected. For Release 6 UEs, the

PERFENH_R6_HSUPA_TTI_10MSTO2MS_LIMIT checkbox under the PerfEnhanceSwitch(BSC6900,BSC6910)parameter is not selected.The time interval from the current time to the time the RNC receivesan RRC CONNECTION REQUEST message, cell update, or trafficvolume-based event 4A/4B measurement report containinginformation about the P-CPICH Ec/N0 (time interval 2) must meeteither of the following requirements: If this duration exceeds the value of EcN0EffectTime

(BSC6900,BSC6910), P-CPICH Ec/N0 is replaced by the valueof FakeEcNo(BSC6900,BSC6910), which must be greater thanor equal to the value of EcN0ThsFor2msTo10ms(BSC6900,BSC6910). If this duration does not exceed the value of EcN0EffectTime

(BSC6900,BSC6910), the P-CPICH Ec/No is greater than orequal to the value of EcN0ThsFor2msTo10ms(BSC6900,BSC6910).




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Service Type TTI SettingNOTE

The RNC checks whether the traffic volume-based event 4A or 4Bmeasurement report is received only whenDRA_PCPICH_ECN0_ON_RACH_UPDATE_SWITCH in theDraSwitch2(BSC6900,BSC6910) parameter is selected in the SETUCORRMALGOSWITCH command.

If either of the preceding requirements is not met, the TTI is set to 10ms.

NOTE

l When the HSUPA DCCC feature is disabled, the MBR equals the maximum rate on the RNC side.l When the HSUPA DCCC feature is enabled, the MBR equals the smaller one of the maximum rate on

the RNC side and the initial access rate of the HSUPA BE service. The maximum rate on the RNCside can be obtained as follows: The RNC compares the MBR assigned by the CN, the maximum ratesupported by the UE, the maximum rate supported by the serving cell, and the rate specified in thelicense file, and selects the lowest of these four values. The RNC uses the lowest value as MBRrnc.The RNC then maps the MBRrnc onto a typical traffic rate and uses the typical traffic rate as themaximum rate on the RNC side. The initial access rate of the HSUPA BE service is set by using theHsupaInitialRate(BSC6900,BSC6910) parameter in the SET UFRC command.

Each service in a combined service is assigned a TTI during service setup or reconfiguration.The combined service is assigned the 2 ms TTI if one of the services is assigned the 2 ms TTI.Otherwise, the combined service is assigned the 10 ms TTI.




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4 Dynamic TTI AdjustmentThis chapter describes the algorithms used to dynamically adjust the TTI for UEs that haveestablished an RAB.

WCDMA RANHSUPA TTI Selection Feature Parameter Description 4 Dynamic TTI Adjustment


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4.1 OverviewAfter an HSUPA service is set up or reconfigured, the RNC dynamically changes the TTI from2 ms to 10 ms or from 10 ms to 2 ms to improve network performance.Compared with the 10 ms TTI, the 2 ms TTI enables the UE to achieve a higher peak rate anda shorter scheduling delay. However, the 2 ms TTI needs to be switched to the 10 ms TTI toincrease coverage and system capacity and to improve the fairness for differentiated services inthe following scenarios:l Insufficient resources over the Iub interfacel Insufficient received total wideband power (RTWP) resourcesl Insufficient available CE resources on the NodeBl Insufficient admission CE resources on the RNCFigure 4-1 illustrates the classification of the HSUPA dynamic TTI adjustment algorithms basedon the usage scenario.

Figure 4-1 Classification of the HSUPA dynamic TTI adjustment algorithms

Table 4-1 describes the HSUPA dynamic TTI adjustment switches.

Table 4-1 HSUPA dynamic TTI adjustment switchesAlgorithm Paramete

rSwitch Description

DynamicTTIadjustmentfor a singlevoice serviceover HSUPA

DraSwitch(BSC6900,BSC6910)

DRA_VOICE_TTI_RECFG_SWITCH

This switch is for dynamic TTI adjustmentfor a single voice service over HSUPA. Whenthis switch is turned on, the TTI can beswitched from 2 ms to 10 ms. For details, seesection 4.2 Dynamic TTI Adjustment for aSingle Voice Service over HSUPA.This switch is turned off by default.



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Algorithm Parameter

Switch Description

Coverage-baseddynamic TTIadjustmentfor a singleBE serviceover HSUPA

DRA_BASE_COVER_BE_TTI_RECFG_SWITCH

This switch is for coverage-based dynamicTTI adjustment for a single BE service overHSUPA. When this switch is turned on, theTTI can be switched from 2 ms to 10 ms orfrom 10 ms to 2 ms.For details, see section 4.3 Coverage-basedDynamic TTI Adjustment for a Single BEService over HSUPA.This switch is turned off by default.

DRA_BASE_COVER_BE_TTI_L2_OPT_SWITCH

This switch specifies whether coverage-based dynamic TTI adjustment for the BEservice over HSUPA is in effect for servicesover uplink enhanced layer 2 (L2) or forservices over DC-HSUPA (Because DC-HSUPA depends on uplink enhanced layer2).This switch is valid when theDRA_BASE_COVER_BE_TTI_RECFG_SWITCH check box under the DraSwitch(BSC6900,BSC6910) parameter is selected.

Differentiation-basedTTIadjustmentfor a singleBE serviceover HSUPA

DRA_BASE_RES_BE_TTI_RECFG_SWITCH

This switch is for differentiation-based TTIadjustment for a single BE service overHSUPA. When this switch is turned on, theTTI can be switched from 2 ms to 10 ms orfrom 10 ms to 2 ms. For details, see section4.4 Differentiation-based Dynamic TTIAdjustment for a Single BE Service overHSUPA.

DRA_BASE_RES_BE_TTI_L2_OPT_SWITCH

This switch specifies whether differentiation-based dynamic TTI adjustment for the BEservice over HSUPA is in effect for servicesover uplink enhanced L2 or for services overDC-HSUPA (Because DC-HSUPA dependson uplink enhanced layer 2).This switch is valid when theDRA_BASE_RES_BE_TTI_RECFG_SWITCH check box under the DraSwitch(BSC6900,BSC6910) parameter is selected.



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Algorithm Parameter

Switch Description

Admission-CE-basedTTIadjustmentfor a singleBE serviceover HSUPA

DRA_BASE_ADM_CE_BE_TTI_RECFG_SWITCH

This switch is for admission-CE-based TTIadjustment for a single BE service overHSUPA. When this switch is turned on, theTTI dynamic adjustment algorithm issupported for admission-CE-based BEservices and the TTI can be switched from 2ms to 10 ms or from 10 ms to 2 ms. For details,see section 4.5 Admission-CE-basedDynamic TTI Adjustment for a Single BEService over HSUPA.

DRA_BASE_ADM_CE_BE_TTI_L2_OPT_SWITCH

This switch specifies whether admission-CE-based dynamic TTI adjustment for the BEservice over HSUPA is in effect for servicesover uplink enhanced L2 or for services overDC-HSUPA (Because DC-HSUPA dependson uplink enhanced layer 2).This switch is valid when theDRA_BASE_ADM_CE_BE_TTI_RECFG_SWITCH check box under theDraSwitch(BSC6900,BSC6910) parameteris selected.

If the algorithm of coverage-based BE service fallback from E-DCH to DCH is applied, thealgorithm of coverage-based dynamic TTI adjustment of BE services is automatically disabled.For details about this algorithm, see the State Transition Feature Parameter Description.The RNC can perform dynamic TTI adjustment for a single BE service only when the HSUPAdynamic channel configuration control (DCCC) function is not applied. For details aboutHSUPA DCCC, see the DCCC Feature Parameter Description.For details about the TTI selection for the PTT service carried over an HSUPA channel, seePush to Talk Feature Parameter Description.The TTI adjustment principles for dual-carrier HSUPA (DC-HSUPA) UEs are the same as thosefor HSUPA UEs. When the TTI for a DC-HSUPA UE is changed from 2 ms to 10 ms, the UEfalls back to an HSUPA one. When the TTI for an HSUPA UE capable of DC-HSUPA is changedfrom 10 ms to 2 ms, the UE is directly reconfigured as a DC-HSUPA one. The dynamic TTIadjustment algorithm triggers the reconfiguration signaling procedure, which may fail and causecall drops if UEs are located in a weak coverage area.Failure rate of the reconfiguration signaling procedure triggered by the dynamic TTI adjustmentalgorithm = (VS.HSUPA.TTI2to10.Att - VS.HSUPA.TTI2to10.Succ)/VS.HSUPA.TTI2to10.Att x 100%



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4.2 Dynamic TTI Adjustment for a Single Voice Service overHSUPA

This section describes dynamic TTI adjustment from 2 ms to 10 ms for a single voice serviceover HSUPA. The current version does not support dynamic TTI adjustment from 10 ms to 2ms for the voice service.Switching the TTI from 2 ms to 10 ms provides reliable coverage for UEs at the cell edge andreduces the call drop rate.The 2 ms TTI is switched to 10 ms TTI when the following conditions are met:l The UE transmit power is higher than the absolute threshold for triggering event 6A1,

indicating the UE transmit power is limited.l When the VoicePmrMcSwitch(BSC6900,BSC6910) parameter is set to ON, the uplink

packet loss rate is higher than the threshold for triggering event A.The RNC adjusts the TTI of the service to 10 ms only upon receiving the event 6A1 and eventA reports. However, the RNC does not adjust the TTI after receiving the event 6A1 report if theevent 6B1 report reaches the RNC before the event A report does. Table 4-2 describes eventsA, 6A1, and 6B1.

Table 4-2 Relevant eventsEventName

MeasurementObject

Triggering Condition

Event A UE packet lossrate

The UE reports event A to the RNC if the packet loss rateexceeds the threshold for triggering event A for twoconsecutive measurement periods.This threshold is specified by one of the followingparameters:l AmrEventAThd(BSC6900,BSC6910): used when the

UE is processing adaptive multi-rate (AMR) services.l WAmrEventAThd(BSC6900,BSC6910): used when

the UE is processing wideband AMR (WAMR)services.

l VoipEventAThd(BSC6900,BSC6910): used when theUE is processing voice over IP (VoIP) services.



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EventName

MeasurementObject


Event 6A1 UE transmitpower

The UE reports event 6A1 to the RNC if its transmit powerexceeds the absolute threshold for triggering event 6A1within a period of 640 ms.This threshold is calculated based on UE services:l For AMR services: Absolute threshold for triggering

event 6A1 = MaxUlTxPowerforConv(BSC6900,BSC6910) - AmrThd6A1(BSC6900,BSC6910)

l For WAMR services: Absolute threshold for triggeringevent 6A1 = MaxUlTxPowerforConv(BSC6900,BSC6910) - WAmrThd6A1(BSC6900,BSC6910)

l For VoIP services: Absolute threshold for triggeringevent 6A1 = MaxUlTxPowerforConv(BSC6900,BSC6910) - VoipThd6A1(BSC6900,BSC6910)

The MaxUlTxPowerforConv(BSC6900,BSC6910)parameter specifies the maximum uplink transmit power.

Event 6B1 UE transmitpower

The UE reports event 6B1 to the RNC when its transmitpower is lower than the absolute threshold for triggeringevent 6B1 within a period of 640 ms.This threshold is calculated based on UE services:l For AMR services: Absolute threshold for triggering

event 6B1 = MaxUlTxPowerforConv(BSC6900,BSC6910) - AmrThd6B1(BSC6900,BSC6910)

l For WAMR services: Absolute threshold for triggeringevent 6B1 = MaxUlTxPowerforConv(BSC6900,BSC6910) - WAmrThd6B1(BSC6900,BSC6910)

l For VoIP services: Absolute threshold for triggeringevent 6B1 = MaxUlTxPowerforConv(BSC6900,BSC6910) - VoipThd6B1(BSC6900,BSC6910)

The MaxUlTxPowerforConv(BSC6900,BSC6910)parameter specifies the maximum uplink transmit power.



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4.3 Coverage-based Dynamic TTI Adjustment for a SingleBE Service over HSUPA

This section describes the feature WRFD-010690 TTI Switch for BE Services Based onCoverage. The TTI needs to be switched from 2 ms to 10 ms in the case of poor coverage andfrom 10 ms to 2 ms in the case of good coverage.For UEs using the 2 ms TTI, the RNC adjusts the TTI to 10 ms only upon receiving the event6A1 and event 4B reports. However, the RNC does not adjust the TTI after receiving the event6A1 report if the event 6B1 report reaches the RNC before the event 4B report does.For UEs using the 10 ms TTI, the RNC adjusts the TTI to 2 ms only upon receiving the event6B2 and event 4A reports. However, the RNC does not adjust the TTI after receiving the event6B2 report if the event 6A2 report reaches the RNC before the event 4A report does.Table 4-3 describes the relevant events.

Table 4-3 Relevant eventsEventName

Measurement Object


Event 6A1 UE transmitpower

The UE reports event 6A1 to the RNC if its transmit powerexceeds the absolute threshold for triggering event 6A1 withina period of 640 ms.Absolute threshold for triggering event 6A1 = Maximumuplink transmit power - BeThd6A1(BSC6900,BSC6910).Here, the maximum uplink transmit power is specified by oneof the following parameters:l MaxUlTxPowerforInt(BSC6900,BSC6910): used for

interactive services.l MaxUlTxPowerforBac(BSC6900,BSC6910): used for

background services.Event 6A2 UE transmit

powerThe UE reports event 6A2 to the RNC if its transmit powerexceeds the absolute threshold for triggering event 6A2 withina period of 640 ms.Absolute threshold for triggering event 6A2 = Maximumuplink transmit power - BeThd6A2(BSC6900,BSC6910).Here, the maximum uplink transmit power is specified by oneof the following parameters:l MaxUlTxPowerforInt(BSC6900,BSC6910): used for


background services.



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EventName

Measurement Object


Event 6B1 UE transmitpower

The UE reports event 6B1 to the RNC when its transmit poweris lower than the absolute threshold for triggering event 6B1within a period of 640 ms.Absolute threshold for triggering event 6B1 = Maximumuplink transmit power - BeThd6B1(BSC6900,BSC6910).Here, the maximum uplink transmit power is specified by oneof the following parameters:l MaxUlTxPowerforInt(BSC6900,BSC6910): used for


background services.Event 6B2 UE transmit

powerThe UE reports event 6B2 to the RNC when its transmit poweris lower than the absolute threshold for triggering event 6B2within a period of 640 ms.Absolute threshold for triggering event 6B2 = Maximumuplink transmit power - BeThd6B2(BSC6900,BSC6910).Here, the maximum uplink transmit power is specified by oneof the following parameters:l MaxUlTxPowerforInt(BSC6900,BSC6910): used for


background services.Event 4A Throughput The medium access control-dedicated (MAC-d) measures the

traffic volume of radio bearers (RBs) in each measurementperiod of 600 ms and obtains the traffic throughput for theperiod.If the throughput exceeds the threshold of event 4A for aperiod specified by EdchTimetoTrigger4A(BSC6900,BSC6910), event 4A is triggered. After event 4Ais triggered, it cannot be triggered again within a periodspecified by EdchPendingTime4A(BSC6900,BSC6910).

Event 4B Throughput The MAC-d measures the traffic volume of RBs in eachmeasurement period of 600 ms and obtains the trafficthroughput for the period.If the throughput is below the threshold of event 4B for aperiod specified by EdchTimetoTrigger4B(BSC6900,BSC6910), event 4B is triggered. After event 4Bis triggered, it cannot be triggered again within a periodspecified by EdchPendingTime4B(BSC6900,BSC6910).



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NOTE

The mechanisms for measuring and triggering these events are the same as those in HSUPA DCCC. Fordetails, see DCCC Feature Parameter Description.

4.4 Differentiation-based Dynamic TTI Adjustment for aSingle BE Service over HSUPA

Differentiation-based Dynamic TTI Adjustment for a Single BE Service over HSUPA can ensureservice differentiation. The following uses an HSUPA UE with a copper priority and a 2 ms TTIas an example. When the UE does not support the UL Layer 2 Improvement feature, it will beallocated a minimum guaranteed rate of MAX (rate when only one RLC PDU is to be transmitted,GBR) if Uu, Iub, or CE resources are insufficient. Assume that the GBR is 64 kbit/s. Then theminimum guaranteed rate is 160 kbit/s (= (336-bit-long RLC PDU 16-bit-long header)/2).

NOTE

RLC is short for Radio Link Control and PDU is short for packet data unit.

However, if the GBR assigned to an HSUPA UE with a gold or silver priority is also 64 kbit/sand the minimum guaranteed rate for the UE is only 64 kbit/s (lower than that of the UE with acopper priority), the TTI of the HSUPA UE with a copper priority must be switched to 10 msto reduce the UE's rate and ensure service differentiation.In addition, HSUPA UEs with the same priority and different TTIs may be allocated differentrates. For example, in a network with available HSUPA bandwidth of 500 kbit/s, a 2 ms TTIHSUPA UE and a 10 ms TTI HSUPA UE of the same priority simultaneously access the network.The 2 ms TTI HSUPA UE can obtain a minimum rate of 200 kbit/s, whereas the 10 ms TTIHSUPA UE can obtain only a minimum rate of 64 kbit/s. To ensure the fairness, the TTI for the2 ms TTI HSUPA UE needs to be switched to 10 ms. When the throughput of the 10 ms TTIHSUPA UE reaches a certain threshold, the 10 ms TTI needs to be switched to 2 ms TTI toachieve higher peak rates.The ResourceOption(BSC6900,BSC6910) parameter specifies the type of resource based onwhich differentiation-based dynamic TTI adjustment is triggered:l If this parameter is set to RTWP, TTI adjustment is triggered based on the Uu resources.l If this parameter is set to Iub, TTI adjustment is triggered based on the Iub resources.l If this parameter is set to CE, TTI adjustment is triggered based on the CE resources.The PriorityOpt(BSC6900,BSC6910) parameter specifies the type of UE for whichdifferentiation-based dynamic TTI adjustment is applied:l If this parameter is set to Gold, TTI adjustment is applied to all users.l If this parameter is set to Silver, TTI adjustment is applied to silver and copper users.l If this parameter is set to Copper, TTI adjustment is applied only to copper users.

Switching 2 ms TTI to 10 ms TTIIf a UE's throughput is within the following range, the 2 ms TTI is switched to the 10 ms TTI:

l If the Uu resources or Iub resources are insufficient, the range is specified by the followingthresholds:



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Upper threshold = UpRatioFor2msTo10msBaseRtwp(BSC6900,BSC6910) xBeHsupa2msTtiRateThs(BSC6900,BSC6910)Lower threshold = LowRatioFor2msTo10ms(BSC6900,BSC6910) x BeHsupa2msTtiRateThs(BSC6900,BSC6910)

l If the CE resources are insufficient, the range is specified by the following thresholds:Upper threshold = UpRatioFor2msTo10msBaseCE(BSC6900,BSC6910) xBeHsupa2msTtiRateThs(BSC6900,BSC6910)Lower threshold = LowRatioFor2msTo10ms(BSC6900,BSC6910) x BeHsupa2msTtiRateThs(BSC6900,BSC6910)

Resources are insufficient in the following cases:l If the current uplink received total wideband power (RTWP) in a cell is larger than the

product of MaxTargetUlLoadFactor(BSC6900,BSC6910) and TrigRatioforUlRTWP(BSC6900,BSC6910), the Uu resources are considered insufficient. The Uu resources areconsidered sufficient again once the RTWP becomes smaller than the product ofMaxTargetUlLoadFactor(BSC6900,BSC6910) and RelRatioforUlRTWP(BSC6900,BSC6910).

l On a logical port of the WMPT (the main control board in the NodeB), if the buffering timefor the user data in a queue is more than 40 ms, the Iub resources in the uplink are consideredinsufficient. The Iub resources are considered sufficient again once the buffering time forthe user data in each queue is less than 20 ms.

l If the operator that a cell belongs to has less than eight licensed CE resources left, the CEresources in the cell are considered insufficient. The CE resources in the cell are sufficientonly when more than 24 licensed CE resources are available.

Switching 10 ms TTI to 2 ms TTIThe 10 ms TTI is switched to 2 ms TTI when the following conditions are met:l The UE throughput is higher than the product of RatioFor10msTo2ms

(BSC6900,BSC6910) and BeHsupa2msTtiRateThs(BSC6900,BSC6910), which is thethreshold for switching the 10 ms TTI to the 2 ms TTI.

l When coverage-based dynamic TTI adjustment takes effect, the UE reports event 6B2.For details about the throughput measurement period, measurement start time, and measurementpending time, see DCCC Feature Parameter Description.

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

A 2 ms TTI HSUPA UE generally requires more CE resources than a 10 ms TTI HSUPA UEto access the network. Therefore, the maximum number of admitted 2 ms TTI HSUPA UEs ina network is smaller than that of admitted 10 ms TTI HSUPA UEs. When the NodeB creditresources are insufficient, the 2 ms TTI is switched to the 10 ms TTI to allow more UEs to accessthe network. When the throughput of the 10 ms TTI HSUPA UE reaches a certain threshold, the10 ms TTI needs to be switched to 2 ms TTI to achieve higher peak rates.The 2 ms TTI is switched to 10 ms TTI when both of the following conditions are met:



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l The local cell, the local cell group or NodeB credit resources are insufficient. The remaining credit resources at the local cell are smaller than the value of

UlTtiCreditSfResThd(BSC6900,BSC6910), indicating that the cell credit resources areinsufficient. The remaining credit resources at the local cell group or NodeB level are smaller than

the value of UlTtiCreditSfResThd(BSC6900,BSC6910), indicating that the NodeBcredit resources are insufficient.

l The UE throughput is lower than the product of UpRatioFor2msTo10msBaseCE(BSC6900,BSC6910) and BeHsupa2msTtiRateThs(BSC6900,BSC6910).

The 10 ms TTI is switched to 2 ms TTI when the following conditions are met:l The UE throughput is higher than the product of RatioFor10msTo2ms

(BSC6900,BSC6910) and BeHsupa2msTtiRateThs(BSC6900,BSC6910), which is thethreshold for switching the 10 ms TTI to the 2 ms TTI.

l The UE reports event 6B2 if the coverage-based dynamic TTI adjustment algorithm isapplied.

4.6 Dynamic TTI Adjustment for Combined Services overHSUPA

The RNC uses the dynamic TTI adjustment rules listed in Table 4-4 for combined services overHSUPA.

Table 4-4 Dynamic TTI adjustment rules for combined services over HSUPACombinationType

Dynamic TTI Adjustment Rules

BE service includedand voice serviceexcluded

Whether to perform dynamic TTI adjustment is decided for each typeof service. The decision is based on the same conditions as those for asingle BE service. The rules for performing dynamic TTI adjustmentare as follows:l The TTI for the combined service is adjusted from 2 ms to 10 ms

only when all the BE services meet the triggering conditions.l The TTI for the combined service is adjusted from 10 ms to 2 ms

if one BE service in the combination meets the triggeringconditions.



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CombinationType

Dynamic TTI Adjustment Rules

Voice serviceincluded

The rules for performing dynamic TTI adjustment are as follows:l Dynamic TTI adjustment can only be performed on the voice

service if the dynamic TTI adjustment switch for the voice serviceover HSUPA is set to ON.However, if the combined service includes a BE service and theHSUPA DCCC function is enabled, dynamic TTI adjustment is notperformed even if the switch is set to ON.

l Dynamic TTI adjustment is not performed if the dynamic TTIadjustment switch for the voice service over HSUPA is set toOFF.

Others Dynamic TTI adjustment is not performed.



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5 Engineering GuidelinesThis chapter contains four functions:l Dynamic TTI Adjustment for a Single Voice Service over HSUPAl Coverage-based Initial TTI Selection and Dynamic TTI Adjustment for a Single BE Service

over HSUPAl Differentiation-based Initial TTI Selection and Dynamic TTI Adjustment for a Single BE

Service over HSUPAl Admission-CE-based Initial TTI Selection and Dynamic TTI Adjustment for a Single BE

Service over HSUPA

WCDMA RANHSUPA TTI Selection Feature Parameter Description 5 Engineering Guidelines


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5.1 Deployment of Dynamic TTI Adjustment for a SingleVoice Service over HSUPA5.1.1 Requirements

l Dependencies on Hardware Dependencies on RNC Hardware

This function does not depend on the RNC hardware. Dependencies on NodeB Hardware

The BTS3812E, BTS3812A and BTS3812AE need to configure EBBI board, EBOIboard, EDLP or EDLPd board. The HBBI, HBOI, HDLP, and HULP board do notsupport dynamic TTI adjustment.The DBS3800 is configured with the EBBC or EBBCd board.The 3900 series base stations are configured with the WBBPb, WBBPd, or WBBPfboard.

l Dependencies on Other FeaturesThe following features have been configured before this feature is activated:WRFD-010612 HSUPA Introduction Package.

l LicenseThis feature is not under license control.

l OthersThe UE supports the 2 ms TTI.

5.1.2 PrecautionsWhen the HSUPA DCCC algorithm takes effect, that is, DRA_HSUPA_DCCC_SWITCH inthe DraSwitch(BSC6900,BSC6910) parameter of the SET UCORRMALGOSWITCHcommand has been selected and the WRFD-010638 Dynamic CE Resource Management featurehas been deactivated, this function does not take effect.

5.1.3 ActivationUsing MML Commands

Run the RNC MML command SET UCORRMALGOSWITCH. In this step, select theDRA_VOICE_TTI_RECFG_SWITCH check box under the parameter Dynamic ResourceAllocation Switch.

MML Command Examples//Turning on the switch for the Dynamic TTI Adjustment for a Single Voice Service over HSUPASET UCORRMALGOSWITCH: DraSwitch=DRA_VOICE_TTI_RECFG_SWITCH-1;



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Using the CMENOTE

When configuring the Dynamic TTI Adjustment for a Single Voice Service over HSUPA function on theCME, perform a single configuration first, and then perform 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 (such as a cell) on the CME.Set parameters on the CME according to the operation sequence in Table 5-1. For instructionson how to perform the CME single configuration, see CME Single Configuration OperationGuide.

Step 2 (Optional) Modify objects in batches on the CME. (CME batch modification center)

To modify objects in batches, click on the CME to start the batch modification wizard. Forinstructions on how to perform a batch modification through the CME batch modification center,press F1 on the wizard interface to obtain online help.----End

Table 5-1 Configuring parameters on the CMESN MO NE Parameter Name Parameter

IDConfigurable in CMEBatchModification Center

1 UCORRMALGOSWITCH

RNC Dynamic ResourceAllocation Switch (set toDRA_VOICE_TTI_RECFG_SWITCH-1)


Yes

5.1.4 Activation ObservationStep 1 In the Navigation Tree pane on the RNC LMT, click the Trace tab. In the displayed Trace

Navigation Tree pane, double-click UMTS Services. On the unfolded list, double-click UuInterface Trace. In the displayed Uu Interface Trace dialog box, select RRC_RB_SETUPand RRC_RB_RECFG to trace Uu interface signaling messages, as shown in Figure 5-1.



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Figure 5-1 Uu Interface Trace dialog box

Step 2 Initiate an HSUPA service on an HSPA-capable UE. View the "RRC_RB_SETUP" messagefrom the Uu-interface tracing data. Verify that the HSUPA service is carried on the E-DCH and2 ms TTI. Move the UE from the cell center towards the cell edge, triggering a handover from2 ms TTI to 10 ms TTI.

Step 3 Analyze the traced messages shown in Figure 5-2 and Figure 5-3. The TTI has switched from2 ms to 10 ms.

Figure 5-2 2 ms TTI



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Figure 5-3 10 ms TTI

----End

5.1.5 DeactivationUsing MML Commands

Run the RNC MML command SET UCORRMALGOSWITCH. In this step, deselect theDRA_VOICE_TTI_RECFG_SWITCH check box under the parameter Dynamic ResourceAllocation Switch.

MML Command Examples//Deactivating the Dynamic TTI Adjustment for a Single Voice Service over HSUPASET UCORRMALGOSWITCH: DraSwitch=DRA_VOICE_TTI_RECFG_SWITCH-0;

Using the CMENOTE

When configuring the Dynamic TTI Adjustment for a Single Voice Service over HSUPA function on theCME, perform a single configuration first, and then perform 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 (such as a cell) on the CME.Set parameters on the CME according to the operation sequence in Table 5-2. For instructionson how to perform the CME single configuration, see CME Single Configuration OperationGuide.




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Table 5-2 Configuring parameters on the CMESN MO NE Parameter Name Parameter ID Configurable

in CME BatchModificationCenter

1 UCORRMALGOSWITCH

RNC Dynamic ResourceAllocation Switch (settoDRA_VOICE_TTI_RECFG_SWITCH-0)


Yes

5.2 Deployment of Coverage-based Initial TTI Selection andDynamic TTI Adjustment for a Single BE Service overHSUPA5.2.1 Requirements

l Dependencies on HardwareNone

l Dependencies on Other FeaturesThe following features have been configured before this feature is activated: WRFD-010614 HSUPA Phase 2 WRFD-010507 Rate Negotiation at Admission Control

l License The license for TTI Switch for BE Services Based on Coverage has been activated on

the RNC side. For details about how to activate the license, see License ManagementFeature Parameter Description.Table 5-3 lists the license information for TTI Switch for BE Services Based onCoverage.



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Table 5-3 License information for TTI Switch for BE Services Based on CoverageFeature ID Feature Name License Control

ItemNE Sales Unit

WRFD-010690

TTI Switch forBE ServicesBased onCoverage

TTI Switch for BEServices Based onCoverage (perMbps)

RNC per Mbps

l Others

The UE supports the 2 ms TTI.

5.2.2 PrecautionsWhen the HSUPA DCCC algorithm takes effect, that is, DRA_HSUPA_DCCC_SWITCH inthe DraSwitch(BSC6900,BSC6910) parameter of the SET UCORRMALGOSWITCHcommand has been selected and the WRFD-010638 Dynamic CE Resource Management featurehas been deactivated, this feature does not take effect.


l Activating Coverage-based Dynamic TTI Adjustment for a Single BE Service over HSUPA1. Run the RNC MML command SET UEDCHTTIRECFG. In this step, set the 6A1

threshold for BE, 6B1 threshold for BE, 6A2 threshold for BE, and 6B2 threshold forBE parameters to 7, 7, 8, and 8, respectively.

2. Run the RNC MML command SET UEDCHTTIRECFG. In this step, set the Upper rateratio thd of TTI 2ms To 10ms for RTWP/Cover and Rate ratio thd of TTI 10ms To2ms parameters to 28 and 83, respectively.

3. Run the RNC MML command SET UCORRMALGOSWITCH to turn on the switch forthis function. In this step, select the DRA_DCCC_SWITCH andDRA_BASE_COVER_BE_TTI_RECFG_SWITCH check boxes under the parameterDynamic Resource Allocation Switch.

4. (Optional) If the Uplink Enhanced L2 feature is also used, run the RNC MML commandSET UCORRMALGOSWITCH. In this step, select theDRA_BASE_COVER_BE_TTI_L2_OPT_SWITCH check box under the parameterDynamic Resource Allocation Switch.

NOTE

DRA_BASE_COVER_BE_TTI_L2_OPT_SWITCH can be selected only whenDRA_BASE_COVER_BE_TTI_RECFG_SWITCH has been selected.

5. (Optional) If there are UEs complying with 3GPP Release 6 on the network, run the RNCMML command SET UCORRMPARA. In this step, deselect thePERFENH_R6_HSUPA_TTI_10MSTO2MS_LIMIT check box under thePerformance Enhancement Switch parameter.

l Activating Coverage-based Initial TTI Selection for a Single BE Service over HSUPA



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1. This function depends on the Coverage-based Dynamic TTI Adjustment for a Single BEService over HSUPA function. Therefore, activate the Coverage-based Dynamic TTIAdjustment for a Single BE Service over HSUPA function before activating this function.

2. Run the RNC MML command SET UFRC. In this step, you are advised to set the Ec/N0Threshold For BE 10ms TTI Estab parameter to 37.

3. Run the RNC MML command SET UCORRMALGOSWITCH. In this step, select theDRA_BASE_COVER_BE_TTI_INIT_SEL_SWITCH check box under the DynamicResource Allocation Switch parameter.

4. (Optional) If UEs need to use this function together with the UL Layer 2 Improvementfeature, run the RNC MML command SET UCORRMALGOSWITCH. In this step,select the DRA_BASE_COVER_BE_TTI_L2_OPT_SWITCH check box under theDynamic Resource Allocation Switch parameter.


MML Command Examples//Activating Coverage-based Dynamic TTI Adjustment for a Single BE Service over HSUPA//Setting coverage thresholds for BE servicesSET UEDCHTTIRECFG: BeThd6A1=7, BeThd6B1=7, BeThd6A2=8, BeThd6B2=8;//Setting throughput thresholds for BE servicesSET UEDCHTTIRECFG: UpRatioFor2msTo10msBaseRtwp=28, RatioFor10msTo2ms=83;//Setting the switch controlling this function to onSET UCORRMALGOSWITCH: DraSwitch= DRA_DCCC_SWITCH-1&DRA_BASE_COVER_BE_TTI_RECFG_SWITCH-1;//(Optional) Setting the DRA_BASE_COVER_BE_TTI_L2_OPT_SWITCH to onSET UCORRMALGOSWITCH: DraSwitch=DRA_BASE_COVER_BE_TTI_L2_OPT_SWITCH-1;//(Optional) Setting the PERFENH_R6_HSUPA_TTI_10MSTO2MS_LIMIT to offSET UCORRMPARA: PerfEnhanceSwitch=PERFENH_R6_HSUPA_TTI_10MSTO2MS_LIMIT-0;

//Activating Coverage-based Initial TTI Selection for a Single BE Service over HSUPA//Activating Coverage-based Dynamic TTI Adjustment for a Single BE Service over HSUPA (MML command examples are listed above.) //Setting coverage thresholds for BE servicesSET UFRC: EcN0ThsFor2msTo10ms=37;//Setting the switch controlling this function to onSET UCORRMALGOSWITCH: DraSwitch= DRA_BASE_COVER_BE_TTI_INIT_SEL_SWITCH-1;//(Optional) Setting the DRA_BASE_COVER_BE_TTI_L2_OPT_SWITCH to onSET UCORRMALGOSWITCH: DraSwitch=DRA_BASE_COVER_BE_TTI_L2_OPT_SWITCH-1;//(Optional) Setting the PERFENH_R6_HSUPA_TTI_10MSTO2MS_LIMIT to offSET UCORRMPARA: PerfEnhanceSwitch=PERFENH_R6_HSUPA_TTI_10MSTO2MS_LIMIT-0;

Using the CMENOTE

When configuring the Coverage-based Dynamic TTI Adjustment for a Single BE Service over HSUPAfunction on the CME, perform a single configuration first, and then perform 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 (such as a cell) on the CME.



29

Set parameters on the CME according to the operation sequence in Table 5-4 and Table 5-5.For instructions on how to perform the CME single configuration, see CME Single ConfigurationOperation Guide.



Table 5-4 Configuring parameters on the CME (Coverage-based Dynamic TTI Adjustment fora Single BE Service over HSUPA)

SN MO NE Parameter Name ParameterID

Configurable in CMEBatchModification Center

1 UEDCHTTIRECFG

RNC 6A1 threshold forBE

BeThd6A1(BSC6900,BSC6910)

Yes

6B1 threshold forBE

BeThd6B1(BSC6900,BSC6910)

6A2 threshold forBE

BeThd6A2(BSC6900,BSC6910)

6B2 threshold forBE

BeThd6B2(BSC6900,BSC6910)

Upper rate ratio thdof TTI 2ms To10ms for RTWP/Cover

UpRatioFor2msTo10msBaseRtwp(BSC6900,BSC6910)

Rate ratio thd ofTTI 10ms To 2ms

RatioFor10msTo2ms(BSC6900,BSC6910)



30



2 UCORRMALGOSWITCH

RNC Dynamic ResourceAllocation Switch(set toDRA_DCCC_SWITCH-1&DRA_BASE_COVER_BE_TTI_RECFG_SWITCH-1)


Yes

3(Optional)

UCORRMALGOSWITCHNOTE

This MO needs tobe configured if theUplink EnhancedL2 feature is used.

RNC Dynamic ResourceAllocation Switch(set toDRA_BASE_COVER_BE_TTI_L2_OPT_SWITCH-1)


Yes

4(Optional)

UCORRMPARANOTE

Configuring thisMO is required ifthere are UEscomplying with3GPP Release 6 onthe network.

RNC PerformanceEnhancementSwitch (set toERFENH_R6_HSUPA_TTI_10MSTO2MS_LIMIT-0)

PerfEnhanceSwitch(BSC6900,BSC6910)

Yes

Table 5-5 Configuring parameters on the CME (Coverage-based Initial TTI Selection for aSingle BE Service over HSUPA)



1 UFRC RNC Ec/N0 ThresholdFor BE 10ms TTIEstab

EcN0ThsFor2msTo10ms(BSC6900,BSC6910)

Yes



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2 UCORRMALGOSWITCH

RNC Dynamic ResourceAllocation Switch(set toDRA_BASE_COVER_BE_TTI_INIT_SEL_SWITCH-1)


Yes

3(Optional)


This MO needs tobe configured if theUplink EnhancedL2 feature is used.

RNC Dynamic ResourceAllocation Switch(set toDRA_BASE_COVER_BE_TTI_L2_OPT_SWITCH-1)


Yes

4(Optional)

UCORRMPARANOTE


RNC PerformanceEnhancementSwitch (set toPERFENH_R6_HSUPA_TTI_10MSTO2MS_LIMIT-0)


Yes

5.2.4 Activation Observationl Method 1

Step 1 In the Navigation Tree pane on the RNC LMT, click the Trace tab. In the displayed TraceNavigation Tree pane, double-click UMTS Services. On the unfolded list, double-click UuInterface Trace. In the displayed Uu Interface Trace dialog box, select RRC_RB_SETUPand RRC_RB_RECFG to trace Uu interface signaling messages, as shown in Figure 5-4.



32


Step 2 Use an HSPA UE to establish an HSUPA service in the cell center. Ensure that the HSUPAservice uses the 2 ms TTI and has been set up on the E-DCH based on the RRC_RB_SETUPmessage traced on the Uu interface. Move the UE from the cell center to the cell edge to triggera switchover of the TTI from 2 ms to 10 ms.


Figure 5-5 2 ms TTI



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----End

l Method 2Monitor the value of the VS.HSUPA.TTI2to10.COVER.Succ (Number of Successful TTISwitchovers Based on Coverage During RB Reconfiguration in a Cell(2ms to 10ms))counter. If the counter value is not zero, the Coverage-based Dynamic TTI Adjustment fora Single BE Service over HSUPA function is effective.


l Deactivating Coverage-based Initial TTI Selection for a Single BE Service over HSUPA1. Run the RNC MML command SET UCORRMALGOSWITCH. In this step, deselect the

DRA_BASE_COVER_BE_TTI_INIT_SEL_SWITCH check box under the DynamicResource Allocation Switch parameter.

2. (Optional) Run the RNC MML command SET UCORRMALGOSWITCH. In this step,deselect the DRA_BASE_COVER_BE_TTI_L2_OPT_SWITCH check box under theDynamic Resource Allocation Switch parameter.

l Deactivating Coverage-based Dynamic TTI Adjustment for a Single BE Service overHSUPA function

1. Run the RNC MML command SET UCORRMALGOSWITCH to turn off the switch forthis feature. In this step, deselect theDRA_BASE_COVER_BE_TTI_RECFG_SWITCH check box under the parameterDynamic Resource Allocation Switch.



34

2. (Optional)Run the RNC MML command SET UCORRMALGOSWITCH. In this step,deselect the DRA_BASE_COVER_BE_TTI_L2_OPT_SWITCH check box under theparameter Dynamic Resource Allocation Switch.

MML Command Examples//Deactivating Coverage-based Initial TTI Selection for a Single BE Service over HSUPA//Setting the switch controlling this function to offSET UCORRMALGOSWITCH: DraSwitch= DRA_BASE_COVER_BE_TTI_INIT_SEL_SWITCH-0;

//(Optional) Setting the DRA_BASE_COVER_BE_TTI_L2_OPT_SWITCH to offSET UCORRMALGOSWITCH: DraSwitch=DRA_BASE_COVER_BE_TTI_L2_OPT_SWITCH-0;

//Deactivating Coverage-based Dynamic TTI Adjustment for a Single BE Service over HSUPA//Setting the switch controlling this function to offSET UCORRMALGOSWITCH: DraSwitch=DRA_BASE_COVER_BE_TTI_RECFG_SWITCH-0;//(Optional) Setting the DRA_BASE_COVER_BE_TTI_L2_OPT_SWITCH to offSET UCORRMALGOSWITCH: DraSwitch=DRA_BASE_COVER_BE_TTI_L2_OPT_SWITCH-0;

Using the CMENOTE

When configuring the Coverage-based Dynamic TTI Adjustment for a Single BE Service over HSUPAfunction on the CME, perform a single configuration first, and then perform 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 (such as a cell) on the CME.Set parameters on the CME according to the operation sequence in Table 5-6 and Table 5-7.For instructions on how to perform the CME single configuration, see CME Single ConfigurationOperation Guide.





35

Table 5-6 Configuring parameters on the CME (Coverage-based Initial TTI Selection for aSingle BE Service over HSUPA)



1 UCORRMALGOSWITCH

RNC

Dynamic Resource AllocationSwitch (set toDRA_BASE_COVER_BE_TTI_INIT_SEL_SWITCH-0)


Yes

2(Optional)

UCORRMALGOSWITCH

RNC

Dynamic Resource AllocationSwitch (set toDRA_BASE_COVER_BE_TTI_L2_OPT_SWITCH-0)


Yes

Table 5-7 Configuring parameters on the CME (Coverage-based Dynamic TTI Adjustment fora Single BE Service over HSUPA function)



1 UCORRMALGOSWITCH

RNC

Dynamic Resource AllocationSwitch (set toDRA_BASE_COVER_BE_TTI_RECFG_SWITCH-0)


Yes

2(Optional)

UCORRMALGOSWITCH

RNC

Dynamic Resource AllocationSwitch (set toDRA_BASE_COVER_BE_TTI_L2_OPT_SWITCH-0)


Yes

5.3 Deployment of Differentiation-based Initial TTISelection and Dynamic TTI Adjustment for a Single BEService over HSUPA



36

5.3.1 Requirementsl Dependencies on Hardware

Dependencies on RNC HardwareThis function does not depend on the RNC hardware. Dependencies on NodeB Hardware



l LicenseThis feature is not under license control.

l OthersThe UE supports the 2 ms TTI.

5.3.2 PrecautionsWhen the HSUPA DCCC algorithm takes effect, that is, DRA_HSUPA_DCCC_SWITCH inthe DraSwitch(BSC6900,BSC6910) parameter of the SET UCORRMALGOSWITCHcommand has been selected and the WRFD-010638 Dynamic CE Resource Management featurehas been deactivated, this function does not take effect.


l Activating Differentiation-based Dynamic TTI Adjustment for a Single BE Service overHSUPA

1. Run the RNC MML command SET UEDCHTTIRECFG. In this step, select theRTWP, Iub, or CE check box under the Resource Option parameter to specify the typeof resource that triggers the initial TTI selection based on differentiation, and set theHighest User Priority Guarantee Option parameter to Gold.

2. If the RTWP check box under the Resource Option parameter is selected, run the RNCMML command MOD UCELLLDM. In this step, set the UL load restricted triggerthreshold ratio and ULload restricted release threshold ratio parameters to 73 and 60,respectively.

3. If the RTWP or Iub check box under the Resource Option parameter is selected, run theRNC MML command SET UEDCHTTIRECFG. In this step, set the Lower rate ratiothd of TTI 2ms To 10ms, Upper rate ratio thd of TTI 2ms To 10ms for RTWP/Cover, and Rate ratio thd of TTI 10ms To 2ms parameters to 0, 28, and 83 respectively.



37

4. If the CE check box under the Resource Option parameter is selected, run the RNC MMLcommand SET UEDCHTTIRECFG. In this step, set the Lower rate ratio thd of TTI2ms To 10ms, Upper rate ratio thd of TTI 2ms To 10ms for CE, and Rate ratio thd ofTTI 10ms To 2ms parameters to 0, 56, and 83 respectively.

5. Run the RNC MML command SET UCORRMALGOSWITCH. In this step, select theDRA_DCCC_SWITCH and the DRA_BASE_RES_BE_TTI_RECFG_SWITCHcheck box under the parameter Dynamic Resource Allocation Switch.

6. (Optional) If the Uplink Enhanced L2 feature is also used, run the RNC MML commandSET UCORRMALGOSWITCH. In this step, select theDRA_BASE_RES_BE_TTI_L2_OPT_SWITCH check box under the parameterDynamic Resource Allocation Switch.

NOTE

DRA_BASE_RES_BE_TTI_L2_OPT_SWITCH can be selected only whenDRA_BASE_RES_BE_TTI_RECFG_SWITCH has been selected.


l Activating Differentiation-based Initial TTI Selection for a Single BE Service over HSUPA1. This function depends on the Differentiation-based Dynamic TTI Adjustment for a Single

BE Service over HSUPA function. Therefore, activate the Differentiation-based DynamicTTI Adjustment for a Single BE Service over HSUPA function before activating thisfunction.

2. Run the RNC MML command SET UEDCHTTIRECFG. In this step, select theRTWP, Iub, or CE check box under the Resource Option parameter to specify the typeof resource that triggers the initial TTI selection based on differentiation.

3. If the RTWP check box under the Resource Option parameter is selected, run the RNCMML command MOD UCELLLDM. In this step, set the UL load restricted triggerthreshold ratio and ULload restricted release threshold ratio parameters to 73 and 60,respectively.

4. Run the RNC MML command SET UCORRMALGOSWITCH. In this step, select theDRA_BASE_RES_BE_TTI_INIT_SEL_SWITCH check box under the DynamicResource Allocation Switch parameter.

5. (Optional) If UEs need to use this function together with the UL Layer 2 Improvementfeature, run the RNC MML command SET UCORRMALGOSWITCH. In this step,select the DRA_BASE_RES_BE_TTI_L2_OPT_SWITCH check box under theDynamic Resource Allocation Switch parameter.


MML Command Examples//Activating Differentiation-based Dynamic TTI Adjustment for a Single BE Service over HSUPA//Specifying the type of resource that triggers the initial TTI selection based on differentiation



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SET UEDCHTTIRECFG: ResourceOption=RTWP-1&IUB-1&CE-1;//Setting the priority class of users that support dynamic TTI adjustments for BE services based on differentiationSET UEDCHTTIRECFG: PriorityOpt=Gold;//Setting load thresholdsMOD UCELLLDM: TrigRatioforUlRTWP=73, RelRatioforUlRTWP=60;//Setting the throughput thresholds for dynamic TTI adjustments triggered by RTWP or IubSET UEDCHTTIRECFG: LowRatioFor2msTo10ms=0, UpRatioFor2msTo10msBaseRtwp=28, RatioFor10msTo2ms=83;//Setting the throughput thresholds for dynamic TTI adjustments triggered by CESET UEDCHTTIRECFG: LowRatioFor2msTo10ms=0, UpRatioFor2msTo10msBaseCE=56, RatioFor10msTo2ms=83;//Setting the switch controlling this function to onSET UCORRMALGOSWITCH: DraSwitch=DRA__DCCC_SWITCH-1&DRA_BASE_RES_BE_TTI_RECFG_SWITCH-1;//(Optional) Setting the DRA_BASE_RES_BE_TTI_L2_OPT_SWITCH to onSET UCORRMALGOSWITCH: DraSwitch=DRA_BASE_RES_BE_TTI_L2_OPT_SWITCH-1;//(Optional) Setting the PERFENH_R6_HSUPA_TTI_10MSTO2MS_LIMIT to offSET UCORRMPARA: PerfEnhanceSwitch=PERFENH_R6_HSUPA_TTI_10MSTO2MS_LIMIT-0;

//Activating Differentiation-based Initial TTI Selection for a Single BE Service over HSUPA//Activating Differentiation-based Dynamic TTI Adjustment for a Single BE Service over HSUPA (MML command examples are listed above.)//Specifying the type of resource that triggers the initial TTI selection based on differentiationSET UEDCHTTIRECFG: ResourceOption=RTWP-1&IUB-1&CE-1;//Setting load thresholdsMOD UCELLLDM: TrigRatioforUlRTWP=73, RelRatioforUlRTWP=60;//Setting the switch controlling this function to onSET UCORRMALGOSWITCH: DraSwitch=DRA_BASE_RES_BE_TTI_INIT_SEL_SWITCH-1;//(Optional) Setting the DRA_BASE_RES_BE_TTI_L2_OPT_SWITCH to onSET UCORRMALGOSWITCH: DraSwitch=DRA_BASE_RES_BE_TTI_L2_OPT_SWITCH-1;//(Optional) Setting the PERFENH_R6_HSUPA_TTI_10MSTO2MS_LIMIT to offSET UCORRMPARA: PerfEnhanceSwitch=PERFENH_R6_HSUPA_TTI_10MSTO2MS_LIMIT-0;

Using the CMENOTE

When configuring the Differentiation-based Dynamic TTI Adjustment for a Single BE Service overHSUPA function on the CME, perform a single configuration first, and then perform a batch modificationif 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 (such as a cell) on the CME.Set parameters on the CME according to the operation sequence in Table 5-8 and Table 5-9.For instructions on how to perform the CME single configuration, see CME Single ConfigurationOperation Guide.


To modify objects in batches, click on the CME to start the batch modification wizard. Forinstructions on how to perform a batch modification through the CME batch modification center,press F1 on the wizard interface to obtain online help.

----End



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Table 5-8 Configuring parameters on the CME (Differentiation-based Dynamic TTI Adjustmentfor a Single BE Service over HSUPA)



1 UEDCHTTIRECFG

RNC Resource Option ResourceOption(BSC6900,BSC6910)

Yes

Highest UserPriority GuaranteeOption

PriorityOpt(BSC6900,BSC6910)

2 UCELLLDMNOTE

Configuring thisMO is required if theRTWP check boxunder the ResourceOption parameter isselected.

RNC UL load restrictedtrigger thresholdratio

TrigRatioforUlRTWP(BSC6900,BSC6910)

Yes

UL load restrictedrelease thresholdratio

RelRatiofor-UlRTWP(BSC6900,BSC6910)

3 UEDCHTTIRECFGNOTE

Configuring thisMO is required if theRTWP or Iubcheck box under theResource Optionparameter isselected.

RNC Lower rate ratio thdof TTI 2ms To 10ms

LowRatioFor2msTo10ms(BSC6900,BSC6910)

Yes

Upper rate ratio thdof TTI 2ms To 10msfor RTWP/Cover


Rate ratio thd of TTI10ms To 2ms


4 UEDCHTTIRECFGNOTE

Configuring thisMO is required if theCE check box underthe ResourceOption parameter isselected.

RNC Lower rate ratio thdof TTI 2ms To 10ms

LowRatioFor2msTo10ms(BSC6900,BSC6910)

Yes



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Upper rate ratio thdof TTI 2ms To 10msfor CE


Rate ratio thd of TTI10ms To 2ms


5 UCORRMALGOSWITCH

RNC Dynamic ResourceAllocation Switch(set toDRA_DCCC_SWITCH-1&DRA_BASE_RES_BE_TTI_RECFG_SWITCH-1)


Yes

6(Optional)


This MO needs to beconfigured if theUplink EnhancedL2 feature is used.

RNC Dynamic ResourceAllocation Switch(set toDRA_BASE_RES_BE_TTI_L2_OPT_SWITCH-1)


Yes

7(Optional)

UCORRMPARANOTE




Yes



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Table 5-9 Configuring parameters on the CME (Differentiation-based Initial TTI Selection fora Single BE Service over HSUPA)



1 UEDCHTTIRECFG

RNC Resource Option ResourceOption(BSC6900,BSC6910)

Yes

2 UCELLLDMNOTE

Configuring thisMO is required if theRTWP check boxunder the ResourceOption parameter isselected.

RNC UL load restrictedtrigger thresholdratio

TrigRatioforUlRTWP(BSC6900,BSC6910)

Yes

UL load restrictedrelease thresholdratio

RelRatiofor-UlRTWP(BSC6900,BSC6910)

3 UCORRMALGOSWITCH

RNC Dynamic ResourceAllocation Switch(set toDRA_BASE_RES_BE_TTI_INIT_SEL_SWITCH-1)


Yes

4(Optional)


This MO needs to beconfigured if theUplink EnhancedL2 feature is used.

RNC Dynamic ResourceAllocation Switch(set toDRA_BASE_RES_BE_TTI_L2_OPT_SWITCH-1)


Yes

5(Optional)

UCORRMPARANOTE




Yes

5.3.4 Activation Observationl Method 1



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Step 1 In the Navigation Tree pane on the RNC LMT, click the Trace tab. In the displayed TraceNavigation Tree pane, double-click UMTS Services. On the unfolded list, double-click UuInterface Trace. In the displayed Uu Interface Trace dialog box, select RRC_RB_SETUPand RRC_RB_RECFG to trace Uu interface signaling messages, as shown in Figure 5-7.


Step 2 Use an HSPA UE to establish an HSUPA service in a cell that has no load. View the"RRC_RB_SETUP" message from the Uu-interface tracing data. Verify that the HSUPA serviceis carried on the E-DCH and 2 ms TTI. Enable more HSPA-capable UEs to access the cell,triggering handovers from 2 ms TTI to 10 ms TTI.




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Figure 5-8 2 ms TTI


----Endl Method 2

Monitor the values of the following counters: VS.HSUPA.TTI2to10.ResRTWP.Succ: Number of Successful TTI Switchovers Based

on RTWP During RB Reconfiguration in a Cell(2ms to 10ms)



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VS.HSUPA.TTI2to10.ResUsedCE.Succ: Number of Successful TTI SwitchoversBased on Number of Occupied CEs During RB Reconfiguration in a Cell(2ms to 10ms) VS.HSUPA.TTI2to10.ResIUB.Succ: Number of Successful TTI Switchovers Based on

Iub Resources During RB Reconfiguration in a Cell(2ms to 10ms)If the value of any of the preceding counters is not zero, the Differentiation-based DynamicTTI Adjustment for a Single BE Service over HSUPA function is effective.


l Deactivating Differentiation-based Initial TTI Selection for a Single BE Service overHSUPA

1. Run the RNC MML command SET UCORRMALGOSWITCH. In this step, deselect theDRA_BASE_RES_BE_TTI_INIT_SEL_SWITCH check box under the DynamicResource Allocation Switch parameter.

2. (Optional) Run the RNC MML command SET UCORRMALGOSWITCH. In this step,deselect the DRA_BASE_RES_BE_TTI_L2_OPT_SWITCH check box under theDynamic Resource Allocation Switch parameter.

l Deactivating Differentiation-based Dynamic TTI Adjustment for a Single BE Service overHSUPA

1. Run the RNC MML command SET UCORRMALGOSWITCH. In this step, deselect theDRA_BASE_RES_BE_TTI_RECFG_SWITCH check box under the parameterDynamic Resource Allocation Switch.

2. (Optional) Run the RNC MML command SET UCORRMALGOSWITCH. In this step,deselect the DRA_BASE_RES_BE_TTI_L2_OPT_SWITCH check box under theparameter Dynamic Resource Allocation Switch.

MML Command Examples//Deactivation procedure//Deactivating Differentiation-based Initial TTI Selection for a Single BE Service over HSUPA//Setting the switch controlling this feature to offSET UCORRMALGOSWITCH: DraSwitch=DRA_BASE_RES_BE_TTI_INIT_SEL_SWITCH-0;//(Optional) Setting the DRA_BASE_RES_BE_TTI_L2_OPT_SWITCH to off SET UCORRMALGOSWITCH: DraSwitch=DRA_BASE_RES_BE_TTI_L2_OPT_SWITCH-0;

//Deactivating Differentiation-based Dynamic TTI Adjustment for a Single BE Service over HSUPA//Setting the switch controlling this function to offSET UCORRMALGOSWITCH: DraSwitch=DRA_BASE_RES_BE_TTI_RECFG_SWITCH-0;//(Optional) Setting the DRA_BASE_RES_BE_TTI_L2_OPT_SWITCH to offSET UCORRMALGOSWITCH: DraSwitch=DRA_BASE_RES_BE_TTI_L2_OPT_SWITCH-0;

Using the CMENOTE

When configuring the Differentiation-based Dynamic TTI Adjustment for a Single BE Service overHSUPA function on the CME, perform a single configuration first, and then perform a batch modificationif required.Configure the parameters of a single object before a batch modification. Perform a batch modificationbefore logging out of the parameter setting interface.



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Step 1 Configure a single object (such as a cell) on the CME.Set parameters on the CME according to the operation sequence in Table 5-10 and Table5-11. For instructions on how to perform the CME single configuration, see CME SingleConfiguration Operation Guide.



Table 5-10 Configuring parameters on the CME (Differentiation-based Initial TTI Selection fora Single BE Service over HSUPA)



1 UCORRMALGOSWITCH

RNC

Dynamic ResourceAllocation Switch (set toDRA_BASE_RES_BE_TTI_INIT_SEL_SWITCH-0)


Yes

2(Optional)

UCORRMALGOSWITCH

RNC

Dynamic ResourceAllocation Switch (set toDRA_BASE_RES_BE_TTI_L2_OPT_SWITCH-0)


Yes

Table 5-11 Configuring parameters on the CME (Differentiation-based Dynamic TTIAdjustment for a Single BE Service over HSUPA)



1 UCORRMALGOSWITCH

RNC

Dynamic ResourceAllocation Switch (set toDRA_BASE_RES_BE_TTI_RECFG_SWITCH-0)


Yes



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2(Optional)

UCORRMALGOSWITCH

RNC

Dynamic ResourceAllocation Switch (set toDRA_BASE_RES_BE_TTI_L2_OPT_SWITCH-0)


Yes

5.4 Deployment of Admission-CE-based Initial TTISelection and Dynamic TTI Adjustment for a Single BEService over HSUPA5.4.1 Requirements

l Dependencies on Hardware Dependencies on RNC Hardware

This function does not depend on the RNC hardware. Dependencies on NodeB Hardware



l LicenseThis feature is not under lic

Hsupa Tti Selection (Ran15.0_04)

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