Alcatel WCDMA KPI Evaluation 3G WCDMA

Krishna K Jayachandran

KPI evaluation 3G WCDMA

Source: Huawei

KPI Structure

CS Call set up diagram

Source: T Mobile documentation ( Public)

PS Call set up diagram

Source: T Mobile documentation ( Public)

Accessibility Ability of user to obtain the requested service from the system.RRC ( Radio Resource Control)RAB ( Radio Access Bearer)- defines type of serviceMain KPIsCSV Access Failure Rate, CSD Access Failure Rate, PS Access Failure Rate, HSDPA Access Failure Rate, HSUPA Access Failure Rate, CS RAB set up success ratio, PS RAB set up success ratio, RRC Congestion Ratio

Voice Access FailureCS Voice RRC FailureVoice RAB FailureCS RRC Setup or RRC Access?RRC or RAB?CS RRC Setup FailureCS RRC Access FailureVoice RAB Setup FailureVoice RAB Access FailureVoice RAB Setup or RAB Access?RRC Failure / Adm ControlRRC Failure / LicenseRAB Failure / DL CodeRRC&RAB Failure / TN BlockingRAB Failure / DL PwrRAB Failure / Hardware ResourceRRC&RAB Setup Failure Cause Analysis RRC Access Failures are mostly due to radio reasons. RAB Access Failures are due to both radio and core network reasons. Troubleshooting flow chart

Sample formula

Failure causesRRC failures causes: Admission control. Uplink issues.

RAB failures. Admission control: Main causes : power, codes, Channel elements. Example of Mumbai circle with wrong test license loaded on 2 cells. CE capacity increased from 30 to 192.

Example # 1 ( Accessibility)

Alarm: System dynamic traffic exceeding licensed limit

Remedial actionCongestion- EDT/MDT, CPICH ( only when absolutely necessary) for power, addition of HW for codes, checking SW licenses for Channel elements.

Retainability Ability of a user to retain its requested service for the desired duration once connected.Key issues are missing neighbors, low quality, Hw issues and alarms, Transport issues.Main KPIs:CSV Drop Rate, CSD Drop Rate, HSDPA Call drop ratio, HSUPA call drop ratio, PS R99 call drop ratio.

Drop CauseVoice DropMissing NeighRL Add FailureUL SychIRAT DropIur DropOther Drop

Analyze existing neighbors with 3G-3G cell relation reportAnalyze cell coverage by RF Planning tool or DrivetestDown tilts or other physical optimizationCheck BTS HW AlarmsCheck Transmission ErrorsCheck Cell Availability Investigating the UE TxPwr by using DrivetestAnalyze cell coverage by RF Planning tool or Drivetestdetermine the number of Event 6a or number of Event 2dNeighbor List cleaning/ deletion GSM coverage area verification for IRAT neighborsRe-prioritization the neighbor list based on usageTransport IssueRBS / RNC HW issueRF issues outside of provided countersUE issuesCheck Iur drop per Iur linkCheck neighbor cell availability

Sample formula:

CS service drop ratio= Number of CS RAB abnormal releases/Total no. of CS RAB releases * 100%.VP Call drop ratio= Number of VP RAB abnormal releases/Total no. of VP RAB releases * 100%.

Example # 2 ( Retainability)

Due to RF causes ( RL synchronous failure)Cell W_DL_Delhi_240_10@1 with CSV failure rate of 19% and voice traffic of 0.53 EDrill down:

MobilityMonitor different kinds of handovers.Soft handover- defining the right neighbors.Missing neighbors, New site turn upsIRAT ( 3G/2G) HO issues.Check 3G/2G neighbor relations- external cell definition BCCH/BSIC to match with internal cell values. Look for issues in the target 2G cell.Main KPIs: CSV IRAT failure rate, Soft handover success ratio, AMR soft handover success ratio, PS soft handover success ratio.

Sample formula

Example # 3 ( mobility) CSV IRATCell ( W_DL_Delhi_351_10@) high IRAT HO failure rate with AMR traffic of 0.25 ErlDrill down:

Iu release from core. Preparation failure. Need to check for resource issues.

CoverageUsed for monitoring cell interference status and soft handover gain in a RNC or cluster.Main KPIs: SHO overhead, UL Interference Cell RatioSHO overhead -Used to evaluate the consumption of resources due to soft handover.Trade off between resource consumption and soft handover benefits.UL Interference cell ratio= (No. of cells with mean RTWP >-98 dbm/ Total No. of Cells). RTWP high/ low? Significance??

Sample formula

Service IntegrityIndicates the service capabilities for PS/HSDPA throughput on busy hour in each cell and for evaluating the UL BLER values for each cell.

Main KPIs:Average UL Throughput for R99 services.Average DL Throughput for R99 services.HSDPA throughput.HSUPA throughput.

PS Counter example

CQIChannel Quality Index (CQI) is a measure of the quality of DLradio interfacemeasuredat the handset ( between 0 and 30)The Node B uses this information in the evaluation and assignment of the downlink air interface throughput for the handset every 2ms, the higher the reported CQI, the higher the achievable throughput.CQI is not the only factor in the evaluation, however it is the only factor that can be readily improved through optimization.CQI is a function of Ec/No.

Chandigarh example- CQI

AvailabilityMeasures the availability of resources.Main KPIs: Radio Network Unavailability Ratio, Worst Cell Ratio

Formula:

TrafficUsed to evaluate the circulated traffic such as CS Erlangs, PS Traffic, Mean UE number for various kind of services.Key KPIs: No. of CS users, No. of PS R99 users, No. of HSDPA users, No. of HSUPA users, HSDPA traffic volume, HSUPA traffic volume.

Example:CS Equivalent Erlang of RNC VS.CSLoad.Erlang.Equiv.RNC: This KPI provides the equivalent Erlang values of all the services in the CS domain in the RNC

Sample formula

No. of CS users= (VS.RB.AMR.DL.12.2+VS.RB.AMR.DL.10.2+VS.RB.AMR.DL.7.95+VS.RB.AMR.DL.7.4+VS.RB.AMR.DL.6.7+VS.RB.AMR.DL.5.9+VS.RB.AMR.DL.5.15+VS.RB.AMR.DL.4.75)No. of HSDPA users= VS.HSDPA.UE.Mean.Cell,VS.HSDPA.UE.Max.Cell.HSDPA Traffic volume= VS.HSDPA.MeanChThroughput.TotalBytes

Daily 3G NQI report

Gsmart Tool Level 2 layout

Thank Q

Alcatel WCDMA KPI Evaluation 3G WCDMA

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