摩托切换判决Word文档格式.docx
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Rxlev_min(n)+Max(0,Pa)
Where:
Rxlev_ncellisthelatestaveragedaverageprocessedforthatneighbour.
Rxlev_min(n)isthedatabaseparametersetintheadd_neighborcommand.
Forinternalcellsrxlev_min_cellisoptionalandifnotspecifiedthenrxlev_min_defintheadd_cellcommandoftheserverisused.
Thelastpartofthiscalculationtemperstheperceiveddownlinkrxlevaveragewiththepotentialuplinkpath:
max(0,Pa)
Pa=ms_txpwr_max(n)-P
P=maxpowerofms
IftheMSissuitedforthePLMNinquestion,Pawillalwaysequaleitherzerooranegativevalueandwillthereforenotbeconsidered.
IftheMSisnotsuitedtothatneighbour,thatis,itsmaximumpowercannotsupportthatrequiredbythatcell,thentheaveragedRxlev_ncellwouldhavetobecomeagreatervaluetoovercomethishandicap.Criteria1wouldthereforepreventsuchahandoveruntiltheMSwasdeeperintothatneighbour.
AnyneighbourfailingCriteria1isnotconsideredfurtherinanyhandoverdecisionprocess.
Criteria2
EachneighbourfortheMSthatsatisfiesCriteria1isthensubjectedtoCriteria2,whichspecifiesthat:
PBGT(n)-ho_margin>
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)&
∙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<
l_rxlev_dl_p+pow_red_step_size+2dBm
(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
u_rxqual_ul_p
28
u_rxqual_dl_p
l_rxqual_ul_h
453
l_rxqual_dl_h
Ifavalueof1isenteredforthealt_qual_procparameter,thedependentparameterswillhavethefollowingrangeofvaluesanddefaults:
0-7
4
1
5
Type
B
SupportedbyOMCGUI
Yes
Cellnumbersrequired
Dependencies
Operatoractions
Respondtotheparametersthatarepresentedwhenthechg_cell_elementcommandisusedtochangethevalueofthealt_qual_procparameter.
Syntax
Add/Changecommandstrings
add_cell<
gsm_cell_id>
<
location>
chg_cell_elementalt_qual_proc<
value>
[cell=]<
cell_desc>
Displaycommandstrings
disp_cell<
cell_number>
disp_elementalt_qual_proc<
cell=<
Values
Valuetype
Binary
Validrange
0or1
0
BERUnits
1
Qualitybandunits
Defaultvalue
decision_alg_num
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.
A(nooperatoractions)
Celldescriptionrequired
None
Add/ChangecommandStrings
chg_elementdecision_alg_num<
cell=<
cell_d