摩托切换判决.docx

摩托切换判决.docx

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摩托切换判决

BasicknowledgeofHDPC

clickherefordetaildescriptonforhdpc&powerbuget

clickhereforparameterdecision_1_n1/p1---decision_1_n8/p8

Standardhandover（powerbugethandover）

Handoverdecisionprocedure-powerbudget

Thelowestpriorityforprocessingisthepowerbudgethandover.Theconditionthatmustbemetforthiscausevalueis:

PBGT（n）>ho_margin

Thehandovermarginforeachneighbourcanbesetdifferently.Themarginisspecifiedintheadd_neighbourcommand,althoughthisfieldisoptionalforinternalcellsandmaybeinterpolatedbytheserversho_margin_defvalueoftheserver,whichisfoundinadd_cell.

Criteria1

Criteria1ensuresthattheMSisperceivingeachneighbour'sRxlevatapowerlevelgoodenoughforthedownlinkpathtosupportagoodcall.Criteria1specifiesthat:

Rxlev_ncell>Rxlev_min（n）+Max（0,Pa）

Where:

Rxlev_ncellisthelatestaveragedaverageprocessedforthatneighbour.

Rxlev_min（n）isthedatabaseparametersetintheadd_neighborcommand.

Forinternalcellsrxlev_min_cellisoptionalandifnotspecifiedthenrxlev_min_defintheadd_cellcommandoftheserverisused.

Thelastpartofthiscalculationtemperstheperceiveddownlinkrxlevaveragewiththepotentialuplinkpath:

max（0,Pa）

Where:

Pa=ms_txpwr_max（n）-P

P=maxpowerofms

IftheMSissuitedforthePLMNinquestion,Pawillalwaysequaleitherzerooranegativevalueandwillthereforenotbeconsidered.

IftheMSisnotsuitedtothatneighbour,thatis,itsmaximumpowercannotsupportthatrequiredbythatcell,thentheaveragedRxlev_ncellwouldhavetobecomeagreatervaluetoovercomethishandicap.Criteria1wouldthereforepreventsuchahandoveruntiltheMSwasdeeperintothatneighbour.

AnyneighbourfailingCriteria1isnotconsideredfurtherinanyhandoverdecisionprocess.

Criteria2

EachneighbourfortheMSthatsatisfiesCriteria1isthensubjectedtoCriteria2,whichspecifiesthat:

PBGT（n）-ho_margin>0

Where:

ho_marginforbothexternalandinternalcellscanbespecifiedintheadd_neighborcommand.

Forinternalcellsthisparameterisoptionalandifnotspecifiedthentheho_margin_defintheadd_celloftheserverisused.

Forlevelandqualityhandovers,ifho_margin_usage_flag=1,ho_marginisreplacedbyho_margin_rxlevandho_margin_rxqual.

ho_margin_usage_flagcanbespecifiedwiththechg_cell_elementandchg_elementcommands.

ho_margin_rxlevandho_margin_rxqualcanbespecifiedviathemodify_neighborcommand.

Criteria2produceseitherapositiveornegativeresultforeachneighbour,whichisfurtherconsideredinthefollowingspecifichandoverprocedure.

NOTE:

Onlyifthemsmeetsthesetwocondition.AndwiththecontrolofHreque&Hreqt.Apowerbugethandovercantakeplace（forpowerbugtehandover）

hrequvehreqtintervalNP

DEADTIME=Hreqve*Hreqt*480ms（当信号变差时,要经过DEADTIME的时间后才有反应）

TheBSSproducesoneaveragepermeasurementperiodofeachofULRxlev,ULRxqual,timingadvanceandULchannelinterferenceonidleradioslots.

Thesemeasurementsarere-averagedbytheRSS,producingaseriesofunweightedaverageseverySACCHmultiframe.

Threeparameterscontrolthisaveragingfunction:

hreqave:

Thenumberofreportedaveragesrequiredtoproduceonerollingaverageasoneinstanceofhreqt.

hreqt:

Thenumberofaveragesretainedinthehandoversoftwaretask,needstobeatleastequaltothenparameterforthatparticularthreshold.

intave:

Thenumberofinterferenceaverages,reportedbytheradio,thatareusedto.produceonerollingaverageevery480ms

hreqaveandhreqtmustbedefinedfor:

∙RxqualUL/DLHandover（ho）&PowerControl（pc）

∙RxlevUL/DLHandover（ho）&PowerControl（pc）

∙SurroundingCellDLHandover（s_cell）

∙TimingAdvanceMStoBSTimingadvance（rel_tim_adv）

intaveandhreqtmustbedefinedfor:

∙IdleInterferenceULIdleChannelProcessing

Figure001showsuplinkSACCHmeasurementreportsforoneneighbour.

Figure001ExampleofuplinkSACCHmeasurementreportsforoneneighbour

NandPvotingmechanism

TogetherwithHreqaveandHreqt,theNandPvotingmechanismensuresthatapowercontrolorhandoverdecisionismadeoveranumberofaveragesandnotjustasnapshotofMSactivity.TheNandPparametersforeachdecisionprocesscanbeenteredintheadd_cellcommand.Theyaredefinedasfollows:

∙NdefinesthenumberofBSSproducedaveragesrequiredforadecisiontobemade.

∙PdefinestheminimumnumberofBSSproducedaverages,overthethresholdvalue,tocauseapositivetrigger.

AvoteoccursforeachdecisionprocesseverySACCHmultiframe.IfPoutofNvotesexceedthethresholdthenahandover/powercontrolconditionwillbeflagged.NotethatN¬hreqt.

Figure002showsuplinkSACCHmeasurementreportsfordlrxlev.

Figure002ExampleofuplinkSACCHmeasurementreportsfordlrxlev

TheMSreportsastreamofservingdownlinkmeasurementsateachreportingperiod.

SettingthePofNnumbertoahighervalue,suchas3outof3,willdelaythehandovertrigger;thiseffectmaybedesirable,asitwillreducethepossibilityoftheMSbouncingbacktothesourcecell.However,inasituationwheretheslowfadeeffectisacceleratedbyafastmovingvehicle,therxlevofthesourcemaybecometoolowtoperformahandover.

SettingthePoutofNnumbertoalowervalue,suchas2outof3,willtriggerafasterhandover,increasingthechanceoftheMSbouncingbacktothesourcecell,butensuringanrxlevofsufficientvaluetoperformthehandover.

Hreqave/hreqtandN/Prelationship

Figure003showsastreamofservingdownlinkmeasurementsasreportedbytheMSateachreportingperiod.Hreqavehasbeensetat4andHreqthasbeensetat3.TheRxlevdownlinkhandoverthresholdhasbeensetto-90dBm.

Figure003Downlinkmeasurements

Parameteraboutpowercontrol

alt_qual_procdecision_alg_num

decision_1_dl_rxlev_av_pdecision_1_dl_rxqual_av_p

decision_1_ul_rxlev_av_pdecision_1_ul_rxqual_av_p

rxlev_dl_pcrxlev_ul_pcrxqual_dl_pcrxqual_ul_pc

l_rxlev_dl_pl_rxlev_ul_pu_rxlev_dl_pu_rxlev_ul_p

l_rxqual_dl_pl_rxqual_ul_pl_rxqual_dl_p_hopping

u_rxqual_dl_pu_rxqual_ul_p

decision_1_n1/p1---decision_1_n4/p4

pow_inc_step_size_dlpow_inc_step_size_ul

pow_red_step_size_dlpow_red_step_size_ul

mspwr_alg（Oscillationpreventionformspowercontrol.ul）

av_rxlev_dl

（Oscillationpreventionforbtspowercontrol.dl）

alt_qual_proc

Description

ThisparameterspecifieswhetherreceivequalityprocessingisperformedusingBitErrorRate（BER）valuesorQualityBand（QBand）units.Thetypeofvaluesandtherangeofvaluesofsixparametersaredeterminedbythevalueassignedtothealt_qual_procparameter.

Thealt_qual_procparametervalueisinitiallyassignedusingtheadd_cellcommand.

Thealt_qual_procparameterforacellmaybechangedusingthechg_cell_elementcommand.Whenthechg_cell_elementcommandisusedtochangethevalueofthealt_qual_procparameter,additionalpromptswillbepresentedforthedependentparameters.Defaultvaluesmaybeenteredbypressingreturnattheprompt.Thecommandwillbeabandonedifaninvalidvalueisentered.

Thevaluethatisenteredforthealt_qual_procparameterwilldeterminethetypeofvalues,rangeofvalues,anddefaultvaluesforthedependentparameters.

Ifavalueof0isenteredforthealt_qual_procparameter,thedependentparameterswillhavethefollowingrangeofvaluesanddefaults:

Dependentparameter

Range

Default

l_rxqual_ul_p

0-1810

226

l_rxqual_dl_p

0-1810

226

u_rxqual_ul_p

0-1810

28

u_rxqual_dl_p

0-1810

28

l_rxqual_ul_h

0-1810

453

l_rxqual_dl_h

0-1810

453

Ifavalueof1isenteredforthealt_qual_procparameter,thedependentparameterswillhavethefollowingrangeofvaluesanddefaults:

Dependentparameter

Range

Default

l_rxqual_ul_p

0-7

4

l_rxqual_dl_p

0-7

4

u_rxqual_ul_p

0-7

1

u_rxqual_dl_p

0-7

1

l_rxqual_ul_h

0-7

5

l_rxqual_dl_h

0-7

5

Type

B

SupportedbyOMCGUI

Yes

Cellnumbersrequired

Yes

Dependencies

Thevaluethatisenteredforthealt_qual_procparameterwilldeterminethetypeofvalues,rangeofvalues,anddefaultvaluesforthedependentparameters.

Operatoractions

Respondtotheparametersthatarepresentedwhenthechg_cell_elementcommandisusedtochangethevalueofthealt_qual_procparameter.

Syntax

Add/Changecommandstrings

add_cell

chg_cell_elementalt_qual_proc[cell=]

Displaycommandstrings

disp_cell

disp_elementalt_qual_proccell=

Values

Valuetype

Binary

Validrange

0or1

0

BERUnits

1

Qualitybandunits

Defaultvalue

0

decision_alg_num

Description

Thisparameterspecifiesthecurrentpowercontrolalgorithm.

Thisparameterspecifiesthecurrentpowercontrolalgorithm.

∙Disablingthedecision_alg_numparameter（decision_alg_num=0）usesbts_p_con_intervalandms_p_con_intervalparameters.

Thissettingdoesnotallowuseofthebts_p_con_ackandms_p_con_acktimers.

∙Enablingthedecision_alg_num（decision_alg_num=1）usesthebts_p_con_ackandms_p_con_acktimers.

Enablingthedecision_alg_numparameteralsoallowsapowerdecisionbasedonqualitytoincreasethepower.Thisresultsinarxlevabovetheupperrxlevthresholdssetin:

∙u_rxlev_dl_pc

∙u_rxlev_ul_pc

Otherdecision_alg_numvaluesarecurrentlyreservedforfutureuse.

Type

A（nooperatoractions）

SupportedbyOMCGUI

Yes

Celldescriptionrequired

Yes

Dependencies

None

Syntax

Add/ChangecommandStrings

add_cell

chg_elementdecision_alg_num

cell=