8/9/2019 Call Fail Analysis Guideline
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Call Failure Analysis
Guideline
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The Call Fail Reason can be classified into several reason :
1. Coverage and Interference Proble.! Coverage Hole and U" Interference.
#. I$ro$er radio and neighbor $araeter setting.
! %issing neighbor& 'rong setting of neighbor cell& i$ro$er setting of
()*alin and (r+levin.
! "o' setting of $reable Po'er Ra$ ,te$& "o' setting for Coon
Channel.! "o' ,etting of Initial ,IR Target.
-. E)*i$ent and Interface Proble.
! Abnoralit of E)*i$ent Cloc/0 ,P0CPU& Ins*fficient RA2 3oard
Reso*rces& Transission Alar.
4. 2et'or/ Eleent and Interface Reso*rce.
! High Cell "oad& High CE Utili5ation& High IU3&IU C,0P, Utili5ation.6. Config*ration Inconsistenc.
! Inconsistent 2*ber of AA"#PATHs across IU0IU3 Interface.
! PATH I and 2,AP Address Config*ration Error of AA"#PATH.
A. Call Fail Reason
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The Call Fail Reason can be classified into several reason :
1. Coverage and Interference Proble.! RRC.FailConnEstab.2oRe$l
! 7,.RA3.FailEstC,.RIPFail
#. E)*i$ent and Interface Proble.
! 7,.RRC.Re8.R".Fail& 7,.RRC.Re8.T2".Fail9I*b $roble.
! 7,.RA3.FailEstabC,.R2"& 7,.RA3.FailEstabC,.T2".
-. 2et'or/ Eleent and Interface Reso*rce.
! 7,.RRC.Re8.Po'er.Cong& 7,.RRC.Re8.U"IU33andCong&
7,.RRC.Re8."IU33andCong& 7,.RRC.Re8.U".CE.Cong&
7,.RRC.Re8.".CE.Cong& 7,.RRC.Re8.Code.Cong.
! 7,.RA3.FailEstCs.Po'er.Cong&
7,.RA3.FailEstab.C,."IU33and.Cong&7,.RA3.FailEstab.C,.U"IU33and.Cong&
7,.RA3.FailEstCs.U"CE.Cong& 7,.RA3.FailEstCs."CE.Cong&
7,.RA3.FailEstCs.Code.Cong
A. Call Fail Reason Statistic Based
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4. Relocation Proble.
! 7,.RA3.FailEstC,.Relo
6. Ca$abilit Proble.
! 7,.RA3.FailEstC,.Uns$ .
;. ,et*$ redirection $roble.
! 7,.RRC.Re8.Redir.Inter.Att 7,.RRC.Re8ect.Redir.Intrat
7,.RRC.Re8ect.Redir.,ervice.
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.
B. Call Fail
Analysis Flo
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The ethodolog to anal5e Call ro$ $roble containing several ste$ belo':1. ata Pre$aration
#. Traffic Analsis.
-. E)*i$ent Analsis.
4. Coverage and Interference Analsis.
6. ,ignalling Analsis
C. Met!odolo"y
! Ho*rl0ail ,tatistic 9C, RA3 assignent fail*re $er cell& RRC connection re8ect $er cell&
Cell T< and R< Po'er& etc.
! The latest ,ite %a$& 2eighbor relation& and cell config*ration0$araeter data.! ,ingle s*bscriber tracing recorded b R2C.
! CHR recorded b R2C.
! Active and Histor Alar.
! ata files collected b T.
C.# $ata Pre%aration
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! The Traffic analsis is related to CE *tili5ation& IU3&IU Utili5ation& and Code Utili5ation. This
Inforation 'e can get fro the ail0Ho*rl ,tatistic.
! The RRC Re8ection Ca*se related to traffic *tili5ation can 'e get in Ra' co*nter belo':
> 7,.RRC.Re8."0U"IU33andCong ? I*b *tili5ation
> 7,.RRC.Re8.Po'er.Cong ? Cell "oad
> 7,.RRC.Re8.U".CE.Cong ? U" CE *tili5ation
> 7,.RRC.Re8.".CE.Cong ? " CE *tili5ation
> 7,.RRC.Re8.Code.Cong ? Code Utili5ation.
! The RA3 Fail Ca*se related to traffic *tili5ation can 'e get in Ra' co*nter belo':
> 7,.RA3.FailEstCs.Po'er.Cong ? Cell "oad
> 7,.RA3.FailEstCs.U"CE.Cong ? U" CE Utili5ation
> 7,.RA3.FailEstCs."CE.Cong ? " CE Utili5ation
> 7,.RA3.FailEstCs.Code.Cong ? Code Utili5ation. > 7,.RA3.FailEstab.C,."0U"IU33and.Cong ? I*b *tili5ation
C.& Tra''ic Analysis
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! Radio net'or/ signaling incl*des signaling of fo*r standard interfaces of UU& IU IU3 and IUR.
When an abnoralit occ*rs in the signaling flo'& 'e can chec/ 'hich $art of signaling flo' is
issing.
! The issing of signaling flo' sho*ld be correlated to UU&IU3&IU& and IUR interface $roble.
! According to single s*bscriber tracing essages& the call dro$ is defined as:
1 RRC C22ECTI2 RE(UE,T FAI"URE
R2C Fails on receiving U" essage of RRC C22ECTI2 ,ETUP C%P"ETE.# RA3 A,,I2%E2T RE(UE,T FAI"URE
C2 Fails on receiving U" essage of RA3 A,,I2%E2T RE,P2,E
Chec/ the call dro$ tie and the signaling essage before call dro$ for f*rther analsis.
! The Isi trace tool 'ith all interface essage and onitoring /$i9CPICH R,CP& CPICH EC2&
U" ,IR& U" T< PWR& and " T< CE PWER hel$ing *s disting*ishing Call Fail Reason.
The Call Fail related to Air Interface or not related to Air Interface $roble.
C.- Si"nallin" Analysis
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Call Fail Analysis Guide
Usin" Si"nallin" IMSI Trace
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! It is ,ho's details of all calls based on o*t$*t fro Trace %anageentGInterface Trace
Tas/GUE.
! Provide convenient& PCbased analsis
1. Call %essage Event
#. The do'nlin/ CPICH R,CP and EC2 istrib*tion.
-. U" ,IR istrib*tion.
4. UE T+ Po'er distrib*tion.
6. " T+ Code P'r
IMSI Trace on MT
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Trace /ieer 'or Post Processin" IMSI Trace o"
# - 4 6
1. Call %essage Event#. The do'nlin/ CPICH
R,CP and EC2
istrib*tion.
-. U" ,IR istrib*tion.
4. UE T+ Po'er distrib*tion.
6. " T< Code P'r.
1
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Call Messa"e E,ent0 RncId0ac0Cell Id
Identi'ication
! Filter The %essage b
RA2AP"CATI2REPRT0RA2API2ITIA"UE%E,,AE essage.
! Convert The HE< val*e into EC val*e.
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Call Messa"e E,ent0 Call Fail Identi'ication
!,nchroni5e the Tie of Call Fail.
! Call Fail %essage defined as:
1. RRC C22ECTI2 RE(UE,T FAI"URE
R2C Fails on receiving U" essage of RRC C22ECTI2 ,ETUP
C%P"ETE.
#. RA3 A,,I2%E2T RE(UE,T FAI"URE.
C2 Fails on receiving U" essage of RA3 A,,I2%E2T RE,P2,E.
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Call Messa"e E,ent0 RRC.FailConnEsta1.NoRe%ly
2RNC does not recei,e RRC C3NNECT SETUP C3MPETE 4
! Filter The %essage b RRCRRCC22ECTRE(UE,T& RRCRRCC22,ETUP& andRRCRRCC22ECT,ETUPC%P.
! If 2o RRCRRCC22ECT,ETUPC%P after RRCRRCC22,ETUP.
! The ,erving EC2 is 14 to 1-.6 d3.
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Call Messa"e E,ent0 RAB SETUP FAI2Failure
in Radio Inter'ace %rcedure2#+44! Filter The %essage b RA2APRA3A,,I2%E2TRE,P2,Era3
Failed"istGca*seGisconnectGradio2et'or/914Fail*re in Radio Interface Proced*re.
! Chec/ All Trace 7ie'er PI9R,CP&EC2&U" ,IR& etc and Alar Iss*es.
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! The 3rea/do'n fro RF Proble.
! Chec/ing CPICH and R,CP istrib*tion.
! If R,CP B?D6 d3 Consider as Poor Coverage& Chec/ for issing neighbor and nearb ,ite $roble.
! If EC2 B?1# d3 and R,CP G?@ d3 consider as " Interference0Pilot Poll*tion. rive Test forverification is needed.
3ad R,CP
and EC2
istrib*tion
Co,era"e and Inter'erence Analysis
CPICH RSCP and ECN3
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! The 3rea/do'n fro RF Proble.
! Chec/ing U" T< PWR istrib*tion.
! %a+ UE T< PWR is to #4 d3.
! If UE T< PWR ore than 6 d3 consider as high UE T< PWR.
! High UE T< PWR can be d*e to E+cessive U" Coverage or High U" Interference& Chec/ if an issingneighbor or nearb ,ite Proble.
High U" T<
PWR
istrib*tion
Co,era"e and Inter'erence Analysis
UE T5 P3WER
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! The 3rea/do'n fro RF Proble.
! Chec/ing U" ,IR istrib*tion.
! The ,IR Target for this ,ervices is 1.6 d3.
! If The ,IR %eas*red "ess than 1.6 d3 can be d*e to E+cessive U" Coverage or High U" Interference&Chec/ an issing neighbor or neighbor ,ite Proble
3ad U" ,IRistrib*tion
Co,era"e and Inter'erence Analysis
U SIR
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! The 3rea/do'n fro RF Proble.
! Chec/ing " T< Code Po'er istrib*tion.
! The T< CE PWER %A< 7al*e for this A%R 1#.# is e)*al to CPICH PWER 9e+a$le --d3 .
! The T< CE PWER %I2 7al*e for this A%R 1#.# is e)*al to 1@ d3
! If The T< Code Po'er Reaching near to CPICH PWER can be d*e to Poor Coverage0Fringe Cell0"Interference. Chec/ an issing neighbor or neighbor ,ite Proble.
High " T<
CE
PWER
istrib*tion
Co,era"e and Inter'erence Analysis
$ T5 C3$E P3WER
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