102BSSPARCapacity Spectral Efficiency Features.docx

102BSSPARCapacity Spectral Efficiency Features.docx

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102BSSPARCapacitySpectralEfficiencyFeatures

BSSPAR

Capacity&SpectralEfficiencyFeatures

TrainingDocument

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Contents

1ModuleObjectives4

2Introduction5

3ChainingOfMetroSiteBTSCabinets6

4LoadControlBetweenLayers7

5DirectAccesstoDesiredLayer/Band（DADL/B）11

6AdaptiveMultiRate（AMR）Coding15

7FrequencyHopping（FH）16

8SynchronisedBSS17

9AutomaticFrequencyPlanning18

10IntelligentShutdown19

11KeyLearningPoints20

12ReviewQuestions22

1ModuleObjectives

Attheendofthemodule,theparticipantwillbeableto:

∙StatehowthecapacityoftheBSScanbeexpanded

∙ExplainhowAMHcanbeusedtoimprovecapacityandspectralefficiency,andlisttheassociatedparameters

∙DescribetheparametersusedwithDADL/B

2Introduction

Thecapacityofeachsector（BTS）ofaBaseStationsitemaybeindicatedbyvariousmeasures:

Erlangs,TCH,RTSL,TRX,subscribers,transactions,andBHCA.Eachofthesereferstosomeaspectofatrafficmodel.

CapacityexpansionataBTSsiteisobtainedbyaddingTRXs,cabinetsandBCFs,andbyimplementingvarioussoftwarefeatures,someofwhichhaveparameterstobeset.

ABTSsectormayalsobeexpandedintoaRNWobjectcalledaSegment（SEG）,toaddcapacityforanotherfrequencybandandanothertechnologysuchasGSM-EDGE.

3ChainingOfMetroSiteBTSCabinets

TheNokiaMetroSiteGSMandEDGEbasestationscanbechainedinordertobuildlargerconfigurationsformicrocellularenvironmentswhileretainingeaseofinstallationandO&Mfunctions.

Thechainingisdonebysynchronisingtheframeclockbetweenbasestations,andextendingtheinternalD-bus.Onetransmissionunitissavedforeachextensioncabinet.TheO&Mfunctionalityiscentralisedwithinthemastercabinet.Onlyoneextensioncablebetweencabinetsisneeded.ThemaximumnumberofcombinedMetroSitebasestationsisthree,andthetotallengthofbuscableislimitedtofivemetres.

Ifaslavebasestationlosesthechaininginterface,the"TRXFaulty"alarmisactivatedforeachofthe1-4TRXsinthecabinet.Thechainingisarranged,inthecaseofthreecabinetconfigurations,insuchawaythatthecentremostcabinetcanbepowered-downwithoutanyproblem

TheparametersrequiredtobesetforthiscapacityconfigurationareBSSIntegrationparameters.

AppropriateparametersettingsatvariousManagedObjectlevelsaremadeduringtheBTSIntegrationprocess.

4LoadControlBetweenLayers

AdvancedMultilayerHandling（AMH）canbeusedtocontroltheloadbetweenlayers,asshowninthefigurebelow.Onlythosehandoversthatimprovetheperformancequalityofthenetworkathighloadsarepermitted.

Figure1.AdvancedMultilayerHandling（AMH）

Figure2.BSCinitiatedTRHOforAMH

Figure3.BSCinitiatedTRHOParameters

TheparametersusedforcontrollingTRHO:

∙AmhTrhoPbgtMargin（ATPM）（HOC）definesAMHpowerbudgetmarginwhencellloadexceedsAmhUpperLoadThreshold（AUT）（BSC）

∙AmhUpperLoadThreshold（AUT）（BSC）definesupperthresholdforbasestationloadandisusedtotriggerBSC-controlledtrafficreasonhandovers

∙AmhMaxLoadOfTgtCell（AML）（BSC）definesthemaximumtrafficloadinadjacentcellallowedforatargetcelloftrafficreasonhandover（TRHO）

∙TrhoGuardTime（TGT）（BSC）definesguardtimeafteraBSC-controlledoranMSC-controlledTRHO,duringwhichahandoverbacktotheoriginalcellisnotallowed

∙TrhoTargetLevel（TRHO）（ADJC）definestheminimumsignallevelwhenatrafficreasonhandoverisallowedtoanadjacentcell

Figure4.IUO&MultilayerLoadControlforAMH

∙AmhTrafficControlIUO（ATCI）（HOC）indicateswhethertheAdvancedMultilayerHandlingisusedwithIntelligentUnderlay-Overlay

∙AmhTrafficControlMCN（ATCM）（HOC）indicateswhethertheAdvancedMultilayerHandlingisusedwithmicrocellsordualband

∙AmhLowerLoadThreshold（ALT）（BSC）defineslowerthresholdfortheloadofthebasestation.ItisusedtotriggeradvancedmultilayerhandlingfunctionalitywithIUOand/orDualBand/microcellfeatures

AMHisanOPTIONALfeature.

Figure5.AMHHandoveralgorithm

5DirectAccesstoDesiredLayer/Band（DADL/B）

ThisfeatureisOPTIONALandwasfirstreleasedinBSSS8.ThefeaturemakesitpossibletoreducethenumberofunnecessaryTCHreservations.IfthereisarealTCHcongestionintheaccessedcell,thenaDirectedRetry（DR）duetocongestion,willbemadewithorwithoutqueuing.

Figure6.DADL/BOverview

Figure7.DADL/BFeatureDescription

TheDADL/Balgorithmisgivenbelow:

Figure8.DADL/BAlgorithm

Figure9.TriggeringtheDADL/BProcess

Figure10.DADL/BTargetCellSelectionProcess

ThefollowingparametersareassociatedwithDADL/B:

ParameterValue

dadlbTargetCellY/N

BTSLoadThreshold（BLT）（BTS）（70%）0….100%

hoPriorityLevel0…7

hoLoadFactor1…7

hoLevelUmbrella-110…-47dBm

MinTimeLimitDR0….14sec

MaxTimeLimitDR1….15sec

∙dadlbTargetCell（DADLA）（ADJC）（Y/N）defineswhetherDADL/BhandoverisappliedtotheadjacentcellincaseofAMRcallestablishment

∙BTSLoadThreshold（BLT）（BTS）（70%）definesproportionofreservedorunavailablechannelsandisusedasaloadcontrolthreshold.Ifthethresholdisexceeded,theBTSisconsideredtobeoverloaded,andhandoverstothatBTSwillbeavoided.

∙hoPriorityLevel（PRI）（ADJC）（0..7）definesaprioritylevelforanadjacentcellthatisusedfortargetcellevaluationduringhandovercontrolprocess

∙hoLoadFactor（OF）（ADJC）（1..7）defineshowmuchthepriorityofthetargetBTSwillbedecreasediftheBTSisoverloaded.TheparameterisusedonlyfortheBTSsunderoneBSCbecausetheBSCcannotgetinformationabouttheloadingofotherBTSs.

∙hoLevelUmbrella（AUCL）（ADJC）（-110..-47dBm）definestheminimumsignallevelofanadjacentcell,whenahandoverisallowedtoanadjacentumbrellacell

∙MinTimeLimitDR（MIDR）（BTS）（0..14sec）definestheperiodstartingfromanassignmentrequestduringwhichthetargetcellevaluationforthedirectedretryhandoverisnotallowed

∙MaxTimeLimitDR（MADR）（BTS）（1..15sec）definesamaximumtimeperiodstartingfromassignmentrequestduringwhichthetargetcellevaluationforthedirectedretryhandoverisallowed

6AdaptiveMultiRate（AMR）Coding

TheuseofAdaptiveMultiRate（AMR）Codingcansignificantlyimprovethespectralefficiencyofanetwork,especiallywhenHalfRatechannelcodingisused.

FormoredetailsaboutAMR,refertotheBSSPARModule:

VoiceandChannelCoding（FR,HR,EFR,AMR）.

7FrequencyHopping（FH）

TheuseofFrequencyHopping（FH）cansignificantlyimprovethespectralefficiencyofanetwork.

FormoredetailsaboutFH,refertotheBSSPARModule:

RadioResourceManagement.

8SynchronisedBSS

TheuseofSynchronisedBSScansignificantlyimprovethespectralefficiencyofanetwork.SyncBSSisinafuturesoftwarerelease.

FormoredetailsaboutSyncBSS,refertoBSSPARModule:

RadioNetworkPerformanceFeatures.

9AutomaticFrequencyPlanning

TheuseofDFCAcansignificantlyimprovethespectralefficiencyofanetwork.DFCAisinafuturesoftwarerelease.

10IntelligentShutdown

Toprovideprotectionagainstmainsbreak,aBTSsiteisusuallyequippedwithbatteryback-up.Theaimistomaintainserviceaslongaspossible.Toachievethis,itisreasonabletoreducecapacityoncertainsitesinordertosavebatterycapacity,andmaintainonlytheessentialBTSfunctions.

Thisfeatureprovidesmeanstocontrolthebehaviourofthesiteequippedwithbatteryback-upincaseofmainsbreak.Asthepowerconsumptiondependsontheloadoftheequipmentsuppliedbytheback-upbatteries,shuttingdownapartofthesiteprolongstheremainingservicetime.

OnaBTSsitebasis,theoperatorcandefinetheservicelevelofthesitetobemaintainedwhilebatteryback-upisinuse.Alsotheoperatorcandefinet