3G Key Performance Indicators (KPI).ppt

7/23/2019 3G Key Performance Indicators (KPI).ppt

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3G Key Performance Indicators (KPI)


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Key Performance Indicators (KPI)

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For radio network optimization, it is necessary to have decided onkey performance indicators.

These KPIs are parameters that are to be observed closely whenthe network monitoring is going on.

Mainly, the term KPI is sed for parameters related to voice and

data channels, bt network performance can be broadlycharacterized into coverage, capacity and !ality criteria also thatcover speech and data aspects.

KPIs are collected from network management system along with"eld measrements sch as drive tests.

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Key Performance Indicators..continued

For the "eld measrements, the tools sed are ones thatcan analyze the tra#c, capacity and !ality of the calls, andthe network as a whole.

For drive testing, a test mobile is sed.

This test mobile keeps on making calls in moving vehiclethat goes arond varios parts of the network to measre$rop %all &ate '$%&(, %)& '%all )ccess &ate(, *+'*andover( etc. parameters.

part from drive testing, the measrements can also be

generated by the network management system. -etwork Management system '-M)( can generate varios

reports which can be analysed, processed and sed tofond problematic parameters in network.

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3G KPIs Detail

Following main KPIs are monitored for MT)/

ccessibility ' )etp Failres0&1 and &&%, %))&(

&etainability ' $rops0&1 and &&%(

Mobility ' )*+,I)*+(

Throghpt

sage '&esorces(

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!

Possible Reason Resolution

1: Poor coverage issue1: Change physical antenna parameters (tilt, Azimuth andheight), If reuired Increase !CP and CPIC" po#er toincrease coverage and capacity$

%: &eigh'our planning issue%: chec for &eigh'our planning of the cells in that area$(issing neigh'ours)

*: +!P issue (+eceive !otal #ide'and po#er)

*: Chec and resolve the issue 'y tracing the source of

e-ternal interference through ./! or spectrum Analyzer orget the hard#are checed

0: Alarms 0: or#ard alarms to /22 team for +ectification$

3: 4vershooting issue3: Chec + conditions in and chec 2ource and !argetCells to have a feel of overshoot$ ae physical changeson the 'asis of results$

5$ P2C Clash6 2ame P2C in cells havingoverlapping coverage

5$ +eplan the P2C of the cells

CS Call Drop

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"


1$ Poor + conditions 1$ change physical antenna changes or If reuiredIncrease !CP and CPIC" po#er to increase coverage andcapacity$

%: issing &eigh'our Issue%: chec for &eigh'our planning of the cells in that area$(issing neigh'ours)

*: +!P issue*: Chec and resolve the issue 'y tracing the source ofe-ternal interference through ./! or spectrum Analyzer orget the hard#are checed

0: Alarms 0: or#ard alarms to /22 team for +ectification$3: !racing the particular 78$

3: Chec C"+ data and see if the drops are taing placeon one particular 78 or different 78

RRC Connection Setup Failure


1$ ++C ailure 1$ 9o Cell ++C +eect Analysis

%: Po#er congestion %: Chec for +!P issue or Increase the po#er

*: C8 Congestion *: ;oad /alancing


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#


1: 4vershooting issue 1: Chec + conditions in 4mstar and chec 2ource and!arget Cells to have a feel of overshoot$ ae physicalchanges on the 'asis of results$

%: issing &eigh'our Issue%: chec for &eigh'our planning of the cells in that area$(issing neigh'ours)

*$ "andover event threshold and parametersettings

*$ +etune the handover event threshold and parametersettings

0$ P2C Clash6 2ame P2C in cells havingoverlapping coverage

0$ +eplan the P2C of the cells

3: Poor coverage issue3: Change physical antenna parameters (tilt, Azimuth andheight), If reuired Increase !CP and CPIC" po#er toincrease coverage and capacity$

IRAT HO Failure (3G Network to 2G Network)


1$ =2 Cell 9iscrepancies 1$ +emove all =2 cell 9iscrepancies

%: Interference on =2 Cell %: +emove interference issue on %= cell

*: Alarms on %= or *= cell *: +emove all alarms either on %= or *= side$

0: I+A! parameters 0: +etune I+A! parameters$

3: Particular cell issue3: ilter the cells having continuous high I+A! failures$8na'le the I+A! attempt and I+A! success counter from%>>> to find out failures are #ith #hich cells

5$ /locing on %= cell 5$ +esolve the issue of 'locing in %= cell

HO Failure (3G3G)

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$


1$ +!P issue1$ Chec and resolve the issue 'y tracing the source ofe-ternal interference through ./! or spectrum Analyzeror get the hard#are checed

%: Po#er issue%: Increase !CP and CPIC" po#er to increase coverageand capacity$

*: Carrier addition *: Add ne# carrier

0: 4vershooting cell0: Chec + conditions in 4mstar and chec 2ource and!arget Cells to have a feel of overshoot$ ae physicalchanges on the 'asis of results$

Power con!e"tion I""ue

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%

Information Element Accept Limit (%)

CSV Access Failure Rate ? 1$> @CSV Drop Rate ?1@

CSV Qualit (DL) 3thpercentile of samples B %$> @ /;8+

CSV Qualit (!L) 3thpercentile of samples B %$> @ /;8+

Soft"Softer #an$oer &er'ea$ ? 1$5

Voice Call Setup time (obile to PS*+) 3thpercentile B 3 seconds

Voice Call Setup time (obile to obile) 3th

percentile B seconds#SDPA Access Failure Rate B 1$> @

#S!PA Access Failure Rate B 1$> @

CSD Call Setup *ime 3thpercentile seconds

CSD Access Failure Rate ?1$> @

#SDPA Drop Call Rate ?1$> @

#S!PA Drop Call Rate ?1$> @

CSD Drop Call Rate B 1$> @

PSD aera,e DL *'rou,'put %1>PSD aera,e !L *'rou,'put 1D>

PSD Call Setup time 3thpercentile sessions * seconds

Stationar a-imum DL #SDPA .it Rate(/bps) E 5 'ps

Stationar a-imum !L #S!PA .it Rate(/bps) E 1$% 'ps

#SDPA Latenc 3thpercentile sessions 1>> ms

PSD Latenc 3thpercentile sessions 1>> ms

3G KPIs and acce&tance 'imit (different for different o&erators)

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d2stment &ecommendation and Implementation

F %ommon %ontrol %hannel Power llocationparameters

F &3 Ma4imm Power parametersF Intra0fre!ency *andover parameters

F Inter0fre!ency *andover parameters

F Inter0&T *andover parameters

F Power %ontrol parametersF ccess parameters

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Parametersdustment *ecommendation and Im&lementation

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P*+,-D*- 'IG ,+-*

vailable on an &-%, &5I and &1) basis, the F%T)tool is available to interface to and represent therelevant conters. %onters are collected on a!arterly '67 minte( basis 'known as a reporting

period( and are stored from the operational date of thecell thereby allowing for past analysis.

There are nmeros conters available from an&-%9&5I9&1). *owever, this procedre concentrateson conters re:ecting the critical performance of thecells. These conters 'and formlae derived therefrom( are best analysed graphically throgh the se ofF%T). The formlae sed for statistics sch as $%&

and %))& may be obtained within the F%T). 1112/20/12


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P*+,-D*- 'IG ,+-*

1oth the -M% and the Planning ; +ptimization


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ACCESSIBILITY

If a cell has poor accessibility it is typically de toeither some form of congestion or a hardware9softwarefalt or a miscon"gration. It is also possible thatthere is some e4ternal sorce of interference 'sch as

a microwave link on the same fre!ency( a>ecting theaccessibility.

ccessibility shold be monitored independently forthe di>erent &1 types 'e.g. )peech, %) ?ideo, P)Interactive &@@, P) Interactive *)$P, etc.( as incertain sitations only one of the &1 types will bea>ected. For e4ample, a disabled *)0T51 will a>ectthe accessibility of the P) Interactive *)$P &1, bt

if the &1) also has a T51 'non0*)( installed then theother &1s may contine to have an acceptable 1312/20/12


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ACCESSIBILITY..continued

Ahen a low %))& is detected on a cell the "rst thingto check is if dmission %ontrol is re2ecting the&&%9&1 setp attempt 'pm-o&e!$enieddm( or if itis failing after admission 'pm-oFailedfterdm(. For

high pm-o&e!$enieddm refer to the Bdmission%ontrolC sections below. For high pm-oFailedfterdmrefer to the BFailre fter dmissionC sections below.

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Example/ F%T) &eport showing a low %))& )peech

cased by a high pm-o&e!$enieddm. -ote thatpm-o&e!$enieddm is not &1 speci"c so other &1s

will most likely be a>ected in this case too.

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Admission Control: DL Power

If dmission %ontrol re2ects a &1 establishment de to alack of $3 power then the conterpm-oFailed&ab


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Admission Control: DL Channelisation Codes

If dmission %ontrol re2ects a &1 establishment de to alack of $3 channelisation codes then the conterpm-oFailed&abect the P) Interactive &@@ '$%*9F%*(%))& worse than the )peech %))& as the P) Interactive&@@ &1 re!ires channelisation codes at a lower spreading

factor 'sing more of the code tree(. In the PJ softwarerelease a cell that spports &@@ and *)$P typically has 7spreading factor 6 $3 channelisation codes reserved for*)$P. This means that appro4imately HEG of availablecodes are reserved for *)$P. Ahen this is the case it is

common for $3 channelisation code congestion too occr.%heck the setting of parameter dl%odedm 'typically set toL7G on MT-=s network(. The long term soltion is to addanother cell in the coverage area to take some of thetra#c this may be achieved by introdcing a second

carrier, another sector, or another site. The short termsoltion is to redce the tra#c carried by the site ')ee the

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Admission Control: Connection Limits

If dmission %ontrol re2ects a &1 establishment deto e4ceeding the con"gred connection limit for )F L,)F 6, or )F HE then the conterpm-oFailed&ab


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Admission Control: Hardware Usae !Channel

Elements"

It is possible for dmission %ontrol to re2ect a &1 establishmentattempt de to ins#cient 3 or $3 &1) hardware capacity i.e. toofew channel elements available. The channel element capacity ofan &1) may be software limited 'according the software licensecon"gred for the &1)( or hardware limited 'according to the T51s

and &51s installed in the &1)(. The two parameters that controlthe &1) hardware admission policy are l*wdm and dl*wdm.1y defalt these parameters shold be set to 6DDG in which caseno hardware is reserved for handovers and dmission %ontrol willnot block &1 establishment attempts for this reason 'see BFailrefter dmission/ *ardware sageC(. In software revision PJ there

is no speci"c conter to indicate this type of dmission %ontrolre2ection, so if pm-o&e!$enieddm is triggered withot any of theother relevant conters indicating a reason then it is likely thatthis is the case and that l*wdm or dl*wdm is incorrectlycon"gred to a vale below 6DDG. In the P7 software release thereare new conters that indicate when lack of hardware capacity

cases &1 establishment failres in a cell/m-oFailed&ab


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So#t Hando$er Dro%s

Typically a cell that has a high nmber of dropped callsde to )+*+ failres 'pm-o)ys&el)peech)o*o( willalso have a high nmber of drops de to missingneighbors 'pm-o)ys&el)peech-eighbr( indicting that

the )+*+ failres are de to missing neighborrelations however, there are sitations where )+*+failres happen for other reasons. Two commonreasons are a neighboring cell that is misbehaving'often de to falty hardware9software( or a

miscon"gration reslting in a failre to perform aninter0&-% )+*+ across the Ir interface.

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Dri$e Test Based Ser$ice &ualit' (easurements

From T


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)** + HSDPA PS Interacti$e Throuh%ut !),C

Le$el"

The throghpt obtained on the packet interactive&1s '*)$P and &@@( are a good indication of theIntegrity o>ered by these services. %onters areavailable at an &-% level to obtain the P) Interactive

verage Throghpt for &@@ '$%*9F%*( and *)$P,as well as the retransmission rate for these twoservices.

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est for &ecial reas/ 4ots&ots

)pecial area refers to a small district or indoors

environment

F +perator o#ces, residence of ?IP.

F Key hotels or entertainment location.F Oovernment location.

F 3ocations of large company or grop sbscribers .

F 3ocations tend to be cared , sch as railway station

or airport.

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+&timi5ation *e&ort

The optimization report

shold be presentedafter the pro2ect passes the cstomer acceptance. Theoptimization report shold inclde/

F Pro2ect backgrond introdction.

F ect for the implemented part.F cceptance test and reslt.

F 3eftover problems and sggestions from theoptimization point of view.

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3G Key Performance Indicators (KPI).ppt

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