Download - Tch Drop Case
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8/10/2019 Tch Drop Case
1/11
NOKIA CONFIDENTIAL 1 (11)
Wireless Network Performance1!11!1"
T#e cell is s$fferin% from &$alit' (ro)lems *$e to
interference
Are more t#an
+,-+./ of calls o$t of
)an* 10
C#eck on t#e interference leels in t#e cell
Are &$alit' an*2or
interference
#an*oers *ominant0
C#eck t#e #an*oer ca$ses an* i*entif' t#e main
tri%%ers for #an*oer
Is 3F an* 3F Ol* t#e
main com(onent0
C#eck Dro( 4reak*own re(ort an* i*entif' main
com(onent of *ro(s
1
5
6
Once interference so$rce #as )een
i*entifie* t#en a ret$ne an*2or
reconfi%$ration can sole t#e
(ro)lem
No
7es
No
7es
7es
No
TC8 Dro(o$t Tro$)le 9#ootin% Process
:etrica
Cell Dail' Dro(o$ts 4reak*own
:etrica
8an*oer Anal'sis
P% ;
P% +
:etrica
3aw Interference
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8/10/2019 Tch Drop Case
2/11
NOKIA CONFIDENTIAL 5 (11)
Wireless Network Performance1!11!1"
Are leel an* &$alit'
#an*oers *ominant0
C#eck on t#e location of t#e site an* s$rro$n*in%
sites an* note t#e terrain2enioronment to *etermine
coera%e e
5 1
A new site or reconfi%$ration of e
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8/10/2019 Tch Drop Case
3/11
NOKIA CONFIDENTIAL 6 (11)
Wireless Network Performance1!11!1"
C#eck on t#e aera%e &$alit' leels of calls in eac#
T3@ of t#e (ro)lematic cell
Are t#ere &$alit'
(ro)lems in one or
more T3@s0
T#e cell is s$fferin% &$alit' (ro)lems *$e to *ownlinkinterference in one or more T3@s
6
:ore inesti%ation is nee*e*
Once interference so$rce #as )een
i*entifie* t#en a ret$ne an*2or
reconfi%$ration can sole t#e (ro)lem
No
7es
P% .
Cell Docter
Cell Anal'ser
C#eck on t#e #ar*ware
lookin% for com)iner or
T3@ fa$lts-ma' nee* a
c#an%eo$t
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8/10/2019 Tch Drop Case
4/11
NOKIA CONFIDENTIAL " (11)
Wireless Network Performance1!11!1"
C#eck on t#e ot#er com(onents of t#e *ro( call rate
es(eciall' 3F Ol*= an* Aint Ol* to see if t#ese
contri)$te to t#e *ro( o$t rate
Do 3F Ol* an*2or
Aint Ol* contri)$te to
t#e *ro( o$t rate0
Are n$m)er of
#an*oer fail$res
si%nificant0
C#eck on t#e #an*oer fail$re rate for eac# of :9C=
49C controlle* incomin% an* o$t%oin% an* intracell
#an*oers
I*entif' a*acenc' (air2(airs contri)$tin% most to
#an*oer fail$re rate= c#eck on n$m)er of #an*oer
attem(ts to t#ese com(are* to ot#er a*acencies
Are t#e calls )ein%
#an*le* )' e
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8/10/2019 Tch Drop Case
5/11
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8/10/2019 Tch Drop Case
6/11
NOKIA CONFIDENTIAL (11)
Wireless Network Performance1!11!1"
Are transco*er fails
a com(onent of *ro(
o$ts0
C#eck on t#e &$alit' of calls an* note an' interference
Does t#e cell s$fferfrom intereference0
T#e #i%# leel of interference is s#owin% $( as
transco*er fail$res
" .
3et$ne or reconfi%$re to
re*$ce t#e interference an*
n$m)er of transco*er fail$res
P% 1
P% 1"
P% 16
:etrica
3aw Interference 7es
7es
No
No
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8/10/2019 Tch Drop Case
7/11
NOKIA CONFIDENTIAL . (11)
Wireless Network Performance1!11!1"
C#eck on t#e alarms for t#e site an* i*entif' an' alarms
t#at ma' e ca$sin% t#e transco*e fail$re alarms
An' alarms linke*
wit# t#e TC fail$re0
C#eck t#e alarm men$ for
instr$ctions on #ow to reair
fa$lt
:ore inesti%ation nee*e*
P% 15
N:95
Alarm men$ for site
No
7es
C#eck t#e #ar*ware
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8/10/2019 Tch Drop Case
8/11
NOKIA CONFIDENTIAL ; (11)
Wireless Network Performance1!11!1"
Are t#ere an' La(*
fail$res0
C#eck t#e alarms for t#e cell an* t#e #istor' of
occ$rence of t#is alarm lookin% at t#e re%$larit'
Follow t#e instr$ctions in t#e
alarm men$ for a fi< of t#e fa$lt
Are 4C9 resets a
ca$se of *ro(o$t0
C#eck t#e alarms for t#e cell an* t#e #istor' of
occ$rence of t#is alarm lookin% at t#e re%$larit'
Follow t#e instr$ctions in t#e
alarm men$ for a fi< of t#e fa$lt
.
;
N:95
Alarm men$ for site
7es
7es
NoP% 15
N:95
Alarm men$ for site
NoP% 1,
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8/10/2019 Tch Drop Case
9/11
NOKIA CONFIDENTIAL + (11)
Wireless Network Performance1!11!1"
Are A)is fails a
com(onent of t#e
*ro(o$t rate0
C#eck on t#e alarms an* also for an' ot#er cells
affecte*
Are t#ere an' alarms
or ot#er cells on t#e
same link affecte*0
Follow t#e instr$ctions in t#e alarm man$al to reme*'
t#e fa$lt
Are t#ere an'#an*oer fail$res 0
1
; +
F$rt#er inesti%ation is nee*e*
No
No
7es
7es
P% 1"
P% 1
P% 1
N:95
Alarm men$ for site
No
7es
T#e tri%%ers for t#is co$nter
are eit#er e&$i(ment or
ra*io I2F fail$re! An o)seration
ma' #el( i*entif' 3F (ro)lem!
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8/10/2019 Tch Drop Case
10/11
NOKIA CONFIDENTIAL 1 (11)
Wireless Network Performance1!11!1"
C#eck on t#e stat$s of t#e T3@s of t#e cell an* see
w#et#er still )locke*
Is ser Actiate* a
com(onent of
*ro(o$t0
Determine w#' te T3@s were )locke* an* t#en
w#et#er an' reme*ial action nee*s to )e taken
Aoi* t#ese *ro(s )' #an*in%o$t calls )efore )lockin% T3@s
+
15
No
7es
P% 1,
P% 1.
N:95
::L E3O comman*
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8/10/2019 Tch Drop Case
11/11
NOKIA CONFIDENTIAL 11 (11)
Wireless Network Performance1!11!1"
Are A-If Call or
A-ifOl* comonents
of *roo$t0
Is Network actiate*
comonent of
*roo$t0
C#eck on t#e alarms to *etermine w#' t#e network
locke* a T3@ res$ltin% in a *roe* call
Follow instr$ctions in alarm
men$ for reair of fa$lt
15
:ore intense anal'sis is re&$ire*
ossil' a *rie test= trace=
oseration an*2or ais trace
11
P% 1
P% 1
No
7es
7es
No
N:95
Alarm men$ for site