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3G Optimization Basics
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Optimization Tips
• Retainability
• Accessibility
• IRAT Failure• UL RSSI Causes
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Check neighbor cell
availability
Add suggested
Neighbors with
WNCS/GPEH/rive !est
data
Analy"e e#isting
neighbors with $G%$G
cell relation re&ort
Analy"e cell coverage by
'( Planning tool /rive
!est data/P'ACH Plots
own tilts or other
&hysical o&ti)i"ation
Check HW Alar)s
Check !* Errors
Check Cell
Availability
eter)ine i+ the
issue a++ects only
one cell or a ',S or
cluster
-eri+y +or SC
Clashes
.nvestigating the E
!#Pwr by using rive
test data or W0''
Check &ara)eter +or
E !#Pwr 1 )a#Sir
Analy"e cell
coverage by '(
Planning tool or
rive test data
se o+ GPEH to
deter)ine the
nu)ber o+ Event 2a
or nu)ber o+ Event
3d
Check Cells doe
'SS. .ssues
.denti+y the +ailing
&hase4
Audit the E#ternal
GS0 Cell 05 with
latest 3G du)&
GS0 coveragearea veri+ication
+or .'A!
neighbors
'e%&rioriti"ation
the neighbor list
based on usage
Check down switch
counter +or
congestion reason4
.nvestigate the ''C
Access +ailure due to
lack o+ 6 &ower 1
codes
Per+or) analysis o+coverage area and
reduce overshooting
-eri+y CE usage and
HW allocation and
di)ensioning
!rans&ort .ssue
',S / 'NC HW
issue
'( issues outside o+
available counters
E issues
Missin !ei"bour So#t $an%o&er Uplin' Sync IRAT Conestion Ot"ers
CS/PS
Retainability
Retainability
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Retainability(Missin !ei"bor
• Drops due to Missing Neighbors
• Counter) pmNoSysRelSpeechNeighbr
• Suestions)
*+ Run ,!CS an% c"ec' Missin !ei"bors+ C"ec' inter(site %istance to %etermine i#t"ey nee% to be a%%e%+ -.rioritize missin nei"bors in t"e or%er o# / o# %rops0 /o# e&ents0 %istance0 a&erae RSC.12c1!o
4+ C"ec' .RAC$ 5elay to assess i# it is o&ers"ootin+
3+ C"ec' nei"bor cell a&ailability+ I# any o# t"e nei"bor cell is %o6n0 it can causemissin nei"bor %rops+
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$i" number o# 5rops %ue toSo$o
Aremissin
!br %ropsalso "i"
I%enti#ymissin
!brs6it"
,!CS 7a%%
C"ec'S$O
Success
rate per!br
relation
8es
!o
!o
Identify somerelations withhigh SHO failrate
Is it Inter(R!C relation9C"ec' Iur 5e:nitions 7
in&estiate ot"errelations o&er same
Iur+
Is !br site "a&in $,issues0 UL RSSI0orConestion %ue to
Trasnport0p6r or ot"erresources+ Fi; nbr site
C"ec' i# Co&eraeo&erlap is su Taret
cellname
8es
C"ec' #or SCCollisions+
5elete an% re(%e:ne
t"e issue coul% be 6it"Source cell+C"ec'
a%mission controlparameters suc"
p6rA%m0 5LCo%eA%m0UL15L $,A%m to see i#
t"ere is su
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$i" number o# 5rops %ue toUL Sync
Are t"ere%rops %ueto missinnbr1S$O
also
Is cello&ers"ooti
n
Other possible issues:• C"ec' #or $, #aults esp RA?boar%+•C"ec' #or Transport issues-conestion
!o
8es
Use comp mo%e statsto c"ec' i# CM usae is"i"+ @eri#y i# enou"
IRAT relations are%e:ne%+
!brin site mi"t beo&ers"ootin+ Use ,!CS to
i%enti#y boomers an% controlpollution
Impro&e 2c1!o in t"eco&erae area byusin %o6nTilts or
C.IC$ c"anes
Resol&e missin
nbrs an% S$O %rops
Is 2c1!o incells
co&eraearea oo%
-#rom,MRR
.ossible e;ternalinter#erence+ C"ec' UL
RSSI
Is cell inarea 6it"oo% 3G
site%ensity9
Re%uce 4% T"res"ol%sto allo6 IRAT uic'ly
be#ore %rop
3G co&erae "ole+Upilt or increase
C.IC$+ @eri#y nbr site#aults+
8es
!o
Increase minp6rma;+2nsure cell is not
po6er(coneste% -Usebusy "our stats
Increase minp6rRl+2nsure cell is not
po6er(coneste% -Usebusy "our stats
Increase rlFailureT 7nOutsyncIn%+
8es
I# t"e RF ser&in area"as Su%%en 2c1!o
c"anes-tunnels0bri%es
Increase -or %ecreaseIn%i&i%ual o=set toimpro&e S$O area
!o
Retainability(Flo6 C"art(UL S8!C
8es
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Retainability %ue to speec"conestion
• Drops due to Speech Congestion
• Counter) pmNoOfermSpeechCong
T"is counter is Incremente% by one 6"en t"e speec" call release is %ue toconestion+ T"e connection is terminate% by R!C+
• Suestions)*+ C"ec' a%mission counters-Lac'%lCo%e0 lac'%lp6r0 UL15L$6A%m on RAB
establis"ment to :n% out t"e resource bottlenec'+4+ C"ec' #or M.Loa%+ -Suest temporary tra
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Retainability(5rops %ue to Ot"ers
• .I Formula)
Drop Due to Other ! pmNoSystemRabReleaseSpeech "pmNoSysRelSpeech#lSynch " pmNoSysRelSpeechSoHo $pmNoOfermSpeechCong
Basically all ot"er speec" %rops 6"ic" 6ere not pee% in any o# t"e speec" %ropcounters %escribe% in t"e pre&ious sli%es+
• Suestions)*+ Resol&e missin nbrs0 So$o0 UL sync issues i# any be#ore Hot"er %rops4+ C"ec' Alarms1T*1UL RSSI1$,1@S,R1M.Loa% #or t"e cell+3+ C"ec' ,MRR an% .ropaation 5elay to impro&e ra%io con%ition an% co&erae
rane+E+ Assess t"e terrain pro:le an% see i# tilt can be a%Juste%++ C"ec' Iub Conestions+K+ C"ec' S$O1IRAT1IF$O #ailure rates+ Optimize t"e respecti&e -S$O1IRAT1IF$O
nbr list+ Trial "otype an% A%Just 4% t"res"ol%s -used%re&hresh'dRscp0
used%re&hresh'd(c)No i# co&erae is 6ea' in t"e area++ C"ec' #or RA?1T? boar% errors0 may reuire a restart+N+ C"ec' Scramblin Co%e Collision+*+ C"ec' C.IC$ .o6er 6it" t"e maJor nei"bors+ eep t"e %elta small to maintain
UL balance in S$O bor%er+ C.IC$ .o6er s"oul% be bet6een (*P o#ma;T;.6r+
**+ Restart t"e site i# all t"e abo&e "as been c"ec'e% an% still cannot :n% out t"e
problem+*4+ Usually %rops %ue to ot"ers are ra%io relate%-RU1CBU1FU+ A site restart or $,
re lacement mi "t be nee%e%+
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IRAT Failure
I%enti#y t"e p"ase in 6"ic" t"e #ailures are occurrin+
IRAT .reparation ."ase• GSM Ra%io Conestion• IMT Trun' Conestion bet6een GSM 7 UMTS S6itc" -!5R
uery coul% be use%• UMTS(GSM !br %e:nition "as incorrect &alues -BCC$0LAC0 CI50
BSIC0 etc
IRAT 2;ecution ."ase• Co(C"annel GSM BCC$•
.oor GSM Uplin' con%ition
IRAT Con:rmation ."ase• Typically poor RF con%itions on bot" UMTS 7 GSM
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CS IRAT "an%o&er FLo6c"art
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UL RSSI 7 .ossible Causees
oo high #* RSSI +,$-. dbm/ can be caused by:
*+ 2;ternal sources o# uplin' inter#erence4+ Inter(mo% pro%uct -antenna #aults3+ Incorrect plumbinE+ .arameter TMA ulGain settin %oes not matc" t"e real TMA ain -Compare AMOS 6it" RF5S+ Faulty %e&ices alon t"e R; pat"
Loose Connectors
Ti"t Cable Ben%s
$i" UL RSSI cause% by e;ternal inter#erence "as sini:cant impact on UL capacity an% co&eraeo# a cell+
oo *ow #* RSSI +0$11. dbm/ can be caused by:
*+ Mostly %ue to TMA not po6ere% up an% incorrect TMA settins
4+ Incorrect plumbin Ba% Connectors0Cables etc
2hat is #* RSSI3• Recei&e% Sinal Strent" In%icator o# t"e total 6i%eban% recei&e% po6er 6it"in t"e
entire c"annel ban%6i%t"• !ote t"at RSSI %oes not %istinuis" bet6een o6n0 ot"er0 or any ot"er un6ante%internal or e;ternal inter#erence
How is #* RSSI measured in the (ricsson system3• T"e RSSI is measure% e&ery * ms+ An a&erae &alue is t"en calculate% e&ery secon%
an% store% as a .5F step rane0 K lon -(** to (K %Bm0 6it" t"e resolutions +%Bm an% %Bm+
• Counter Hpma&eraeRSSI0 MO Class HCarrier an% incremente% on t"e RBS le&el
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CS/PS Accessibility
(Ericsson Classification)
RRC RAB
ccessity
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M. Loa% A%min Control License !o%e Bloc'in Transport Bloc'in
•C"ec' M. loa%#or Main Rac's 12;tension SubRac's $i"99
•C"ec' #or Core!et6or' -Callser&ers 1 SGS!
outaes 0a=ectsall cells in R!C+
•Re("ome Sites
• C"ec' .arametersettins #or)
• a Fee%erlent"1TMA
• b A%m Control• c C"ec' a&ailableresources -5o6nlin'
T; po6er0
C"annelizationco%es+T"is is lo6
possibility since 0att"is stae0 resourcesreuire% are muc"lo6er t"an at RAB
stae+
•RBS speci:cparameters
•@eri#y 1correctin%i&i%ual license%capacity le&els #ort"e no%e+ -&iaAMOS
•C"ec' C"annelelements usaetren%s
•C"ec' #or no%econ:urationerror1mismatc"0no%e limitationsor transportnet6or' layerser&iceuna&ailability+
•C"ec' #orconestion onuser plane-AAL41 controlplane -UniSaal1SCT. #or IuBresources+• 2;pan% T!
ban%6i%t"
•C"ec' IuCs 1 Iu.ssucc rate0 a=ectsall cells in R!C
CS)4S 5ccessibility
+RRC/
$ar%6are1Antena alarms0
@S,R
RRC Succ rate coul% be lo6 %ue to RF relate% issuesalso+-.oor RF in RAC$0 FAC$ In&estiate t"e RF usin,MRR an% trial ma;#ac"*po6er an%constant@alueCprac"
RRC
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Congestion !o%e Bloc'in Transport Bloc'in
C"ec' #or no%econ:urationerror0 no%e
limitations ortransportnet6or' layerser&iceuna&ailability+
•C"ec' #or conestion on userplane -AAL41 control plane-UniSaal 1SCT. #or IuB resources+• 2;pan% T! ban%6i%t" -a%% T*s0%e:ne more @c
•C"ec' T* 2rrors•C"ec' Loc'e% T*s
•C"ec' Iub1T5 -@c1@p Mismatc"es•S"are Tra
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Congestion
CS1.S Accessibility
-RAB
AS2 $ar%6are Resource Connection Limit5L .o6er Co%e
C"ec' i# Ma;imum Transmission .o6er isaline% 6it"Ma;5lCapability C"ec' Ma;imum
Transmission .o6er an%C.IC$ ratio
Increase .6rA%m0Re%uce .6rO=set 2;plore IFLS 6it"ot"er Carrier 2nable or Increase5irecte% Retry to GSM Re%uces#*KA%m1s#A%mConsi%er increasin
po6er license• A%% anot"er Carrier
C"ec' %lCo%eA%m&alues i# a%Justmentis still possibleRe%uce 3E' Userson 5L -s#A%m
Re%uce $S(.5SC$Co%esRe%uce $S(SCC$Co%es
C"ec' Loc'e% T?1RA?Boar%sC"ec' "anin C2-restartC"ec' $S12UL resourceallocation0ul1%l$6A%m
parameter in Iublin'Re%uceeulSer&in1!onSer&inA%m
A%%0Replace RA?1T?Boar%s
@eri#y settins #orH%lAS2A%m0UlAseA%mC"ec' #or RNNtra
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$ar%6are Fault
2scalate2scalate
Restart Boar%
Col% Restart !o%e
@eri#y S, on no%e-Utran Report1OSSSMO
S6ap Car%s1Boar%s
ReplaceCar%s1Boar%s
IncorrectAttenuation1Losses
TMA UL Gain.arameter C"ec'
@eri#y RF5S
2;ternalInter#erence-UL RSSIproblem e&en %urino=(pea' "ours
CS1.S Accessibility-RRC1RAB
2rrors1Cras"esAlarms
RSSI T* 2rrors
(RRC1RAB
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Accessibility1Bloc' Reasons(Summary
• Common Failure Reasons
7 Lac' o# 5L .o6er
7 Lac' o# 5L Co%e
7 Lac' o# UL15L $ar%6are Resource
7 2;cee% Connection Limits -#or .S
7 Iub Conestions
7 UL RSSI 7 $, or T* Faults
7 !ei"bor site1cell %o6n
• A%mission Control ( Set o# rules t"at %etermines 6"et"er a U2 is
rante% access on ma'in a connection reuest+ A%mission controlis also use% 6"en a%%in a RAB 0 or a ne6 RL &ia S$O or ups6itc"
o# ser&ices