Call Drop Analysis Guideline

5/18/2018 Call Drop Analysis Guideline

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HUAWEI RNP TEAM HUAWEI Confidential 1

Call Drop Analysis Guideline


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HUAWEI RNP TEAM HUAWEI Confidential

B.1 Air Intera!e Pro"le#.

The Call Drop Reason can be classified into several reason with Raw statistic relation.

Coverae! "eihbor and Interference #roble$.% &'.RA(.)oss.C'.R*

% &'.RA(.)oss.C'.R*.R)CRst

% &'.RA(.)oss.C'.R*.U)'+nc

% &'.RA(.)oss.C'.R*.U,"oRepl+

% &'.RA(.)oss.C'.R*.-th

A. Call Drop Reason

B.$ Non Air Intera!e Pro"le#.The Call Drop Reason can be classified into several reason with Raw statistic relation.

Abnor$al #roble$% &'.RA(.)oss.C'.Abnor$

Cell conestion proble$% &'.RA(.)oss.C'.Constion.CE))

'inallin proble$% &'.RA(.)oss.C'.'R(Reset

R"C proble$% &'.RA(.RelReC'.-/! &'.RA(.RelReC'.RA(#ree$pt!

&'.RA(.RelReC'.UTRA"en IU Interface proble$

% &'.RA(.)oss.C'.Aal0)oss


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B. Call Drop

Analysis %lo&


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The $ethodolo+ to anal+2e Call Drop proble$ containin several step below31. Data #reparation.

0. Coverae Anal+sis.

4. "eihbor Anal+sis.

. Interference Anal+sis.

5. E,ip$ent Anal+sis.

6. 'inallin Anal+sis.

C. Met'odolo(y


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% The Threshold of C#ICH R'C# 789:5 d($ consider as #oor Coverae.

% If the ,plin; trans$it power reaches the $a


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% The D) interference or #ilot #oll,tion classified If ECN* +,-1$ dB and RCP /,-0 dB#.

% The D) #ower in connected $ode will reachin $a


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C.3 E5uip#ent Analysis

% The Histor+ and Active Alar$ can help to ive ,ic; reference for anal+2in the networ;proble$.

% The Alar$ infor$ation of R"C! "ode b! /''! /BW! and Interface?Trans$ission can we

ather as earl+ dianosis to red,ce ti$e if we fo,nd Call Drop proble$.

% Alar$s that affect Call Drop $ainl+ incl,de trans$ission alar$s of the carrier sinalin

?E1=T1! 'AA)!"C#=CC#! /T#4(! internal I#C and AA)0#ATH and e,ip$ent alar$s

?#ower A$plifier! &'WR! cloc;! C#U! D'#! etc.. If s,ch alar$s occ,rred! find o,t the

ca,ses and eli$inate these alar$s i$$ediatel+.



% Radio networ; sinalin incl,des sinalin of fo,r standard interfaces of UU! IU IU( andIUR. When an abnor$alit+ occ,rs in the sinalin flow! we can chec; which part of sinalin

flow is $issin.

% The $issin of sinalin flow sho,ld be correlated to UU!IU(!IU! and IUR interface

proble$.

% Accordin to sinle s,bscriber tracin $essaes! the call drop is defined as3

1 The R"C oriinates RA( release ?the $essae is

RA"A#FRA(FRE)EA'EFRE9TR( Reset

0 The R"C oriinates IU release ?the $essae is RA"A#FIUFRE)EA'EFRE9

'R( Reset.

Chec; the call drop ti$e and the sinalin $essae before call drop for f,rther anal+sis.

% The I$si trace tool with all interface $essae and $onitorin ;pi?C#ICH R'C#! C#ICH

EC"-! U) 'IR! U) T@ #WR! and D) T@ C-DE #-WER helpin ,s distin,ishin Call

Drop Reason. The Call Drop related to Air Interface or not related to Air Interface proble$.

C.6 i(nallin( Analysis


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Call Drop Analysis Guide

Usin( i(nallin( IMI Tra!e


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% It is 'hows details of all calls based on o,tp,t fro$ Trace /anae$ent9Interface Trace

Tas;9UE.

% #rovide convenient! #C9based anal+sis

1. Call /essae Event

0. The downlin; C#ICH R'C# and EC"- Distrib,tion.

4. U) 'IR Distrib,tion.

. UE T< #ower distrib,tion.

5. D) T< Code #wr

IMI Tra!e on 7MT


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Tra!e 8ie&er or Post Pro!essin( IMI Tra!e 7o(

0 4 5

1. Call /essae Event0. The downlin; C#ICH

R'C# and EC"-

Distrib,tion.

4. U) 'IR Distrib,tion.

. UE T< #ower distrib,tion.

5. D) T@ Code #wr.

1



Call Messa(e E)ent- 7a!-Cell Id

Identii!ation

% *ilter The /essae b+ RA"A#F)-CATI-"FRE#-RT $essae.% Convert The HE@ val,e into DEC val,e.



% '+nchroni2e the Ti$e of Call Drop.% Call Drop /essae defined as3

1. The R"C send RA( Release?RA"A#FRA(FRE)EA'EFRE

0. The R"C send IU Release?RA"A#FIUFRE)EA'EFRE.

Call Messa(e E)ent- Call Drop Identii!ation



Call Messa(e E)ent- Nor#al Call

Release9User Release:% *ilter The /essae b+ RA"A#FDIRECTFTRA"'*ER9c$9$s9Disconnect9Ca,se9

&al,e3nor$al9call9clearin?16$essae.



Call Messa(e E)ent- Call Drop

Identii!ation9Nor#al Unspe!iied941::%

*ilter the $essae b+ RA"A#FDIRECTFTRA"'*ER9c$9$s9Disconnect9Ca,se9&al,e3nor$al9,nspecified?41$essae.

% This /essae not consider as Call Drop.

% This /essae consider as proble$ fro$ C" ?test n,$ber ti$er or /TC side.



% The (rea;down fro$ R* #roble$.

% Chec;in C#ICH and R'C# Distrib,tion.

% If R'C# 789:5 d($ Consider as #oor Coverae! Chec; for $issin neihbor and nearb+ 'ite proble$.

% If EC"- 78910 d( and R'C# 89G d($ consider as D) Interference=#ilot #oll,tion. Drive Test forverification is needed.

(ad R'C#

and EC"-

Distrib,tion

Co)era(e and Intereren!e Analysis

CPICH RCP and ECN*




% Chec;in U) T@ #WR Distrib,tion.

% /a< UE T@ #WR is to 0 d($.

% If UE T@ #WR $ore than 5 d($ consider as hih UE T@ #WR.

% Hih UE T@ #WR can be d,e to E




% Chec;in U) 'IR Distrib,tion.

% The 'IR Taret for this 'ervices is 91.5 d(.

% If The 'IR /eas,red )ess than 91.5 d( can be d,e to E




% Chec;in D) T@ Code #ower Distrib,tion.

% The T@ C-DE #-WER /A@ &al,e for this A/R 10.0 is e,al to C#ICH #-WER ?e

Call Drop Analysis Guideline

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