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"CapacityManagement3GNetworkFor internal use1 Nokia Siemens NetworksPresentation / Author / DateOutlineIntroductionCapacity Areas in UTRAN1.2.3.4.Air InterfaceWBTS HW ResoursesRNCTransport IuBIu MonitoringIu-CSIu-PSIu-RFor internal use2 Nokia Siemens NetworksPresentation / Author / DateIntroductionWCDMA network interfacesand internal resources should be monitoredFor internal use3 Nokia Siemens NetworksPresentation / Author / DateIntroductionThe various measurement were used to identify the capacity issuesandtheir negative impactonaccessibility(CSSR)ofthevariousRABs:1.2.3.CS speech (AMR)PS data (R99)HSPAdataFor internal use4 Nokia Siemens NetworksPresentation / Author / DateCapacity Areas in UTRANEssential to monitor the available resources in UTRAN Capacity from initial dimensioning phase may no be sufficient in some cases Marketing campaigns lead to higher resource utilizationCapacity bottlenecks impact the call setup success rates(CSSR) Mobile user perceives poor setup success rates directlyWith these measurements, network capacity can bemonitored in a proactive mode Capacity upgrades can be triggered taking into account existing leadtimes HW units, internal procedures like planning or implementationFor internal use5 Nokia Siemens NetworksPresentation / Author / DateCapacity Areas in UTRANDuring call set-up [RRC, RAB] several resource areas are checked and physical / logical resources allocated.Air InterfaceWBTS HW Resources TransportRNC1 RadioresourcesUL interferenceDL transmisson powerDL Codes3 DMCUallocation1a CoderesourcesDSP processingRLC/MACIuB(N*) E1 capacity / AAL2FSP/ WSP capacity2 WBTS resources4 Iub resources(transmission)For internal use(Channel Elements)6 Nokia Siemens NetworksPresentation / Author / DateFor internal use7 Nokia Siemens Networks Presentation / Author / DateCall Setup Success Rate - CSSRCSSRforaspecific serviceiscalculatedthefollowingway:RRC partRAB partFor RAB setup & access phase we can distinguish variousfailure causes:Failures due to UE are not related to capacity issues in the network related to UE problemsACCESS PHASE: due to UE due to RNCSETUP PHASE: due to AC due to BTS due to Transport due to RNC due to Frozen BTS due to AAL2 iuB, License, AAL2 IuCS, anchoring, UEcapabilities, not supp. paramsCSSR any service = RRC connection setup & access X RAB setup & access any serviceDecisioncriteriaNoAccesibility 1%Failures due toTRANS >1%Failures due toBTS >1%Failures due toAC >1% AMR accessibility PS R99 accessibility HSPA accessibilityRAB setup failures1. Admission Control (AC) failures RADIOIndicates lack of radio resources:DL powerMeasurement ofPtxTotal, transmission powerof NonHSDPA,HSDPAetc.UL interferenceMeasurement ofMeasurement ofRSSIPrxTotal and PrxNoiseDL channelization codes:Channelization code occupancy (min, max, avg) Channelization code blocking rateHSDPA code usageHSDPA code downgradesRejection rate in downlink and uplink (SRB, AMR, CS data, PS data)due to congestionCommon channel load (RACH, FACH, PCH) typically not a problemFor internal use9 Nokia Siemens NetworksPresentation / Author / DateRAB setup failures1. AdmissionControl (AC) failures RADIOHigh non-HSPA loadDL powerUL interferenceChannelizationcodesHigh non-HSPA loadHigh DL loadHigh chan. CodeutilizationHigh ULinterference/loadExternalInterferenceYesPosible to reduceR99 usage?YesNoPosible toreduce thecode usage?YesPosible tooptimize throughput?NoNoUpgradeUpgradeFor internal use2nd NoBkiaTSieSmenps Noetworeksrtocarrier10Presentation / Author / DateMax_Code Occupancy >95%; Avg_Code Occupancy >80%Marginal Load Time Share UL > 50% Overload Time Share UL> 2%Average UL R99 Load > PrxTargetR99 power >> HSDPA powerSpread. Code Blocking Rate in DL>5%;SFxx Blocking Rate highNoise floor of the System>-90dBmMarginal Load Time Share DL > 50% Overload Time Share DL> 2%Average DL R99 Load > PtxTargetFailures due toAC >1% AMR accessibility PS R99 accessibilityRAB setup failures1a. HSDPA accessibility1.Indicates problems for access of HS-DSCH (HSDPA access failure rate):Due to UL DCHProblems of return UL return channelRelated to R99 radio resources2.Due to TOO MANY HSDPA USERSLicence limit 48 users HSDPA license upgrade to 64 usersR99 is selected, which can cause capacity problem in use of radioresources Check radio resources for R99If licence upgrade is not sufficient,is an optiontheDedicatedHSDPAscheduler3.4.5.DueDueDuetoto toBTS (channel elements)Iub (transmission) RNCFor internal use11 Nokia Siemens NetworksPresentation / Author / DateRAB setup failures1a.HSDPA accesibilityHSDPAaccessibilit y < 99%Radio related issuesOthersGo toTRANSPORTfailuresDCH Selecteddue to too manyHSDPA users> 0.5%Go toBTS failuresProblem inR99 ?Go toRNC failures1. HSDPA 64 usersLicense upgradeOR LATERGo toRADIO Resoures2. HSDPA DedicatedScheduler upgradeFor internal use12 Nokia Siemens NetworksPresentation / Author / DateHSDPA AccessFR due to RNCHSDPA AccessFR due to BTSHSDPA AccessFR due to IubHSDPA Access FRdue to UL DCHRAB setup failures2. BTS failuresFastIndicates lack of WBTSbaseband resources = channel elements (CE):Measurement of available CEs(min, max, avg)CE utilizationMeasurement of usage ofIn UL, DL (min, max, avg) Per serviceCEs:High CE utilizationCE usagecan be reduced?YesNoWBTS HW upgrade(system module)For internal use13 Nokia Siemens NetworksPresentation / Author / DateAVG_CE_USAGE > 80%MAX_CE_USAGE >95%Failures due toBTS >1%RAB setup failures3. RNC failuresFastIndicates lack of RNC internalresourcesDSP Service StatisticsMeasurementDSP Resource UtilisationMeasurementsDSP State Change MeasurementsDSP Load MeasurementsIub, IuCS, IuPS throughputDSP loadHigh DSP loadRNC HW upgradeTraffic loadmeasurementatRNCHigh Iu TrafficRNC Interfacecapacity upgradeFor internal use14 Nokia Siemens NetworksPresentation / Author / DateRNC_Traffic Load: Iub Traffic Load IuCS Traffic Load IuPS Traffic LoadRNC_Unit Load: AVG_Load >80% MAX_Load >95%Failures due toRNC >1%RAB setup failures4. Transport failuresFastIub ReservationsIndicates lack of transport resourcesTraffic load measurementsAverage VCC Ingress/Egress utilisationAverage VPC Ingress/Egress utilisationCAC reservationsAllocated Average Capacity of CBR VCC Allocated Capacity per ATM VCC (cps) AAL2 connection reservation success rateNumber of AAL2 Connections Average AAL2 connection utilisation Max_AAL2_connections (248 max) Max_AAL2_connections_HSPDAShared HSDPA AAL2 allocation utilisationHigh Iub loadYesPosible toreduce Iub utilization?YesNoIub upgradeFor internal use15 Nokia Siemens NetworksPresentation / Author / DateAVG_UP_CAC Reservation > 80%Peak_UP_CAC Reservation >90%Failures due toTRANS/AAL2 Iub >1%Additional tasksEven if all the capacity issues would be resolved,accessibility can not be expectedthe100%RF optimization (e.g. overshootingcells)Propagation delay measurementsCQI measurementsRSCP, Ec/Io measurementsMobility optimization Soft handover Inter-system handoverFailures due to UEs cannotbe avoidFor internal use16 Nokia Siemens NetworksPresentation / Author / DateIu MonitoringThe scope of this presentation isRNC interfacesmonitoringusingmeasurements in the RNCand intheBTSIu-CSIubMGWRNCBTSIu-PSSGSNIurRNCFor internal use17 Nokia Siemens NetworksPresentation / Author / DateContentAAL2CACmeasurementsFor internal use18 Nokia Siemens NetworksPresentation / Author / Date1. ATM load measurementsATM Load Measurements - OverviewATM Load Measurements in RNCVirtual Path Connection (VPC)Virtual Circuit Connection (VCC)ATMinterfaceVirtual channelVirtual pathAAL2connectionVirtual pathFor internal use19 Nokia Siemens NetworksPresentation / Author / DateATM interfaceATM VPC and VCC MeasurementsATM VPC/VCC measurements count cells per VPC/VCC during measurement periodUp to 1024 VPCs and all VCCs (RU10 onwards) can be measured perRNCatthesame timeEnablescalculatingaverage throughput over the measurement periodConfigured capacityMeasurement periodActual trafficMeasured average trafficFor internal use20 Nokia Siemens NetworksPresentation / Author / DateCells/periodATM VPC and VCC MeasurementsIu-CS, Iu-PS and Iur can be measured as wellUse of ingress and egress countersIub in downlink direction is measured using egress countersIu-PSindownlink directionismeasured using ingresscountersEgressdirectionIngressdirectionIu-CSIubMGWRNCBTSIu-PSSGSNIurRNCFor internal use21 Nokia Siemens NetworksPresentation / Author / DateATM Interface MeasurementATM interface utilization and trafficper service category CBR, UBR andUBR+Virtual channelThe ATM interface levelmeasurement is relevant if you haveunshaped VPCs with UBR+ VCCs inside and the sum of VCC PCRs exceeds the interface capacity Otherwise the ATM CAC and/or VCC/VPC configuration will prevent overload possibilityPotentially useful for Iu if IuPS andIuCS are on their own NIS cards.Virtual pathAAL2connectionVirtual pathFor internal use22 Nokia Siemens NetworksPresentation / Author / DateATM interfaceContentATMloadmeasurementsFor internal use23 Nokia Siemens NetworksPresentation / Author / Date2. AAL2 CAC measurementsRNC AAL2 Connection Admission ControlBandwidth requirement is affected byALC parameters, ALC set (for DCCH),ActivityfactorsDelay requirement,losstoleranceconnectionconnectionATMVCC PCRDone for common channels, SRB, RT DCH, NRT DCH, Streaming HSDPAand SharedHSDPAAllocationVCC bundle is a special caseFor internal use24 Nokia Siemens NetworksPresentation / Author / DateAAL2 reservation for existing connectionsNew Newup to this requiring capacity this much would fit in capacitywould beblockedor internal useSummaryRAN capacity monitoring processes are focused on thefollowing interfaces and network elements:Radio Interface capacity WBTS power, code treeIub capacity Transmission capacityNode B capacity WBTS BaseRNC processing capacitybandprocessingcapacityIu-CS,Iu-PSandIurtraffic-Unit load25 Nokia Siemens NetworksPresentation / Author / DateMonitoring / InterfaceProactive MonitoringReactive MonitoringAir Interface-BTS power DL/UL-Channelisation code utilisation-S-CCPCH & PRACH load-Setup failure due to AC-Service rejection ratio-Code blocking-RB downgrade/releaseIub Interface-Iub traffic load-Resource reservation-Setup failure due to transmission-Resource reservation success rateHW Channel Element-CE utilisation-Setup failure due to BTSRNC Capacity-RNC traffic load-Setup failure due to RNC." "ThankYou!For internal use26 Nokia Siemens NetworksPresentation / Author / Date