tch drop case

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


2/11



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


3/11



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


4/11

NOKIA CONFIDENTIAL " (11)


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


5/11


6/11

NOKIA CONFIDENTIAL (11)


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


7/11

NOKIA CONFIDENTIAL . (11)


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


8/11

NOKIA CONFIDENTIAL ; (11)


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,


9/11

NOKIA CONFIDENTIAL + (11)


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!


10/11



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*


11/11



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

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