DT BLER KPI Cant Meet Target after Modifying BlerQualityKey
WordsBlerQuality DLBLERKPI SymptomWe found DL BLER KPI cant meet
targer when taking DT Acceptance at I country A project.Cause
AnalysisOne region engineer found DL BLER cant meet target when
they take DT acceptance,then take some actions to check probable
resaons.First by parameter check we found TrchType value is
TRCH_DCH,that is to say business subflow prefer to bear on
transmission channel(DCH) .Meanwhile, BLERQuality value is -10(when
TrchType value is TRCH_DCH, BLERQuality must be setting ),as shown
in the belowing picture,
The paremeter BLERQuality shows what transmission quality target
DCH channel should meet,it is the DCH BLER targer value at UU
interference.It has the following influence on radio network:
Network BLER will be higher if the paremeter value is big,at the
contrary, Network BLER will be lower if the paremeter value is
small. So we suspect because this parameter value is too high which
lead to BLER increase,and the channel quality is worse
accordingly.All of this can lead to DT BlER cant meet
target.Handling ProcessChecking RAB Index is 40-78 when parameter
BLERQuality value is -10,that is to say this paremeter value is -10
only for INTERACTIVE and BACKGROUNDBE service of BE service ,as
shown in the following picture,
Subsequently we modified parameter BLERQuality from -10 to -20
for INTERACTIVE and BACKGROUNDBE service.To verify its impact on PS
we monitor related counter and found thant it cant become worse
after modify BLERQuality,as shown in the following picture,Drop
HSUPA:
Drop HSDPA:
Drop PS:
Comparing DT BLER for different BLERQuality value and the result
shown as the following picture,DT Result of BLERQuality=-10,
DT Result of BLERQuality=-20,
From the comparison we can see that DL BLER improved after
modifying BLERQuality from -10 to -20 and it can meet the
target.The script show as following:MOD UTYPRABOLPC:RABINDEX=40,
SUBFLOWINDEX=0, TRCHTYPE=TRCH_DCH, DELAYCLASS=1,
BLERQUALITY=-20;MOD UTYPRABOLPC:RABINDEX=41, SUBFLOWINDEX=0,
TRCHTYPE=TRCH_DCH, DELAYCLASS=1, BLERQUALITY=-20;MOD
UTYPRABOLPC:RABINDEX=42, SUBFLOWINDEX=0, TRCHTYPE=TRCH_DCH,
DELAYCLASS=1, BLERQUALITY=-20;MOD UTYPRABOLPC:RABINDEX=43,
SUBFLOWINDEX=0, TRCHTYPE=TRCH_DCH, DELAYCLASS=1,
BLERQUALITY=-20;MOD UTYPRABOLPC:RABINDEX=44, SUBFLOWINDEX=0,
TRCHTYPE=TRCH_DCH, DELAYCLASS=1, BLERQUALITY=-20;MOD
UTYPRABOLPC:RABINDEX=45, SUBFLOWINDEX=0, TRCHTYPE=TRCH_DCH,
DELAYCLASS=1, BLERQUALITY=-20;MOD UTYPRABOLPC:RABINDEX=46,
SUBFLOWINDEX=0, TRCHTYPE=TRCH_DCH, DELAYCLASS=1,
BLERQUALITY=-20;MOD UTYPRABOLPC:RABINDEX=47, SUBFLOWINDEX=0,
TRCHTYPE=TRCH_DCH, DELAYCLASS=1, BLERQUALITY=-20;MOD
UTYPRABOLPC:RABINDEX=48, SUBFLOWINDEX=0, TRCHTYPE=TRCH_DCH,
DELAYCLASS=1, BLERQUALITY=-20;MOD UTYPRABOLPC:RABINDEX=70,
SUBFLOWINDEX=0, TRCHTYPE=TRCH_DCH, DELAYCLASS=1,
BLERQUALITY=-20;MOD UTYPRABOLPC:RABINDEX=71, SUBFLOWINDEX=0,
TRCHTYPE=TRCH_DCH, DELAYCLASS=1, BLERQUALITY=-20;MOD
UTYPRABOLPC:RABINDEX=72, SUBFLOWINDEX=0, TRCHTYPE=TRCH_DCH,
DELAYCLASS=1, BLERQUALITY=-20;MOD UTYPRABOLPC:RABINDEX=73,
SUBFLOWINDEX=0, TRCHTYPE=TRCH_DCH, DELAYCLASS=1,
BLERQUALITY=-20;MOD UTYPRABOLPC:RABINDEX=74, SUBFLOWINDEX=0,
TRCHTYPE=TRCH_DCH, DELAYCLASS=1, BLERQUALITY=-20;MOD
UTYPRABOLPC:RABINDEX=75, SUBFLOWINDEX=0, TRCHTYPE=TRCH_DCH,
DELAYCLASS=1, BLERQUALITY=-20;MOD UTYPRABOLPC:RABINDEX=76,
SUBFLOWINDEX=0, TRCHTYPE=TRCH_DCH, DELAYCLASS=1,
BLERQUALITY=-20;MOD UTYPRABOLPC:RABINDEX=77, SUBFLOWINDEX=0,
TRCHTYPE=TRCH_DCH, DELAYCLASS=1, BLERQUALITY=-20;MOD
UTYPRABOLPC:RABINDEX=78, SUBFLOWINDEX=0, TRCHTYPE=TRCH_DCH,
DELAYCLASS=1, BLERQUALITY=-20;Suggestions and Summary No
2013-5-22,6, 6