KPI (Key Performance Indicator)
TCH Drop: disconnect a unwanted call is known as TCH drop [TCH Drop = (TNDROP)/TCASSAL*100]
SDCCH Drop Rate = [(CNDROP-CNRELCONG)/ (CMSESTAB)]*100 %
SDCCH Blocking = (CCONGS)\(CCALLS)*100
TASR = (TCASSAL) / (TASSALL) *100
HOSR = (SUMOHSUCC+SUMEOHSUCC)/ (SUMOHOATT+SUMEOHATT)*100
Random Access Success Rate = (CNROCNT)/ (CNROCNT+RAACCFA) * 100
RAACCFA: Failed Random Access
CNROCNT: All accepted Random Access
TCH DROP
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HO FAIL
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DLQ
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Low Signal strength DL & UL
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Less, Many or Mismatch NBR
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BCCH & TCH Frequency Interference
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Bad Quality DL & UL
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TCH Cong at target cell
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Interference or error on E1
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High TA
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Low SS or Bad Qual on cell border
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Mismatch MAIO & HSN
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Bad Parameter regulation
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Mismatch HO algorithm
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Hardware Issue, faulty or Alarm
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High ICM, VSWR or path imbalance
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Mismatch HO parameter setting
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Antenna Faulty/ feeder
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E1 error & Transmission fault
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Sector swap
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Time-slot Issue
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Bad Parameter setting
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CO-BCCH / BSIC
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Poor Coverage and Spill
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Drop call due to Handover
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HO Delay
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High Utilization (>150%)
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Less, Many or Mismatch NBR or HO Delay
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uncorrected NBR planning
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Ater Issue or Ater Circuit Faulty
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Suddenly drop
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Interference or error on E1
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wrong combing
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Hardware fault ( Alarm & Swap)
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Bad Antenna installation
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Hardware fault ( Alarm & Swap)
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Low SACCH multiframe value
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TASR
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SD & TCH Congetion
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Low RLT value
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Poor coverage, Weak UL
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High utilization
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Low ACCMIN Value
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High utilization ( FR utilization)>150%
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less Half rate
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Low RACCH_access_min
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Hardware alarm or Trx Faulty
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HCS feature
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length of timer T3103 is low
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abis or A interface congestion or error
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length of timer T3109 is low
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length of timer T3111 is low
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Length of timer T305/T308 is set to great value.
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SD DROP
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PSR
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RACH
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Low SS, Bad Qual, and High TA
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Parameter of PSR is MFRMS and timer is T3113
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Poor BSIC Plan
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LAC Boundary
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incorrect cell parameter
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Poor BCCH Plan
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SW congestion
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excess paging discard
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Poor Coverage and Spill
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Due to TCH Congestion
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incorrect MSC parameter
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Phantom RACCH
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Hardware or TS faulty
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poor paging streagady
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Faulty antenna and cable
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Interference or error on E1
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SD congestion
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Poor ACCMIN and CRO
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drop call due to TCH congestion
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combined BCCH
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Mismatch MAXRET & TX
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uncorrected LAC dimension
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abis or A interface congestion or error
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decreasing signaling load on CCCH
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