GSM RNO Training-Network Interference and Solutions_R1.0

7/25/2019 GSM RNO Training-Network Interference and Solutions_R1.0

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Network Interference and Solutions

R1.0

Suitable for staff with junior P&O skill certificates (lower thancertificate III)

Issued b Network O!ti"i#ation Sste" $e!t.

GSM Training Materials forGSM Training Materials forSkill CertificatesSkill Certificates


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%ersion Introduction

%ersion $ate uthor Re'iewed b "end"entRecords

R1.0 2009-03-11 Su ShaoLi Fei AiPing First eition


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rainin *oals

!o "no# the $lassi%i$ation o% inter%eren$e&

!o 'aster the analyti$al 'ethos o%

inter%eren$e (ro)le'&

!o 'aster the %lo# o% hanling

inter%eren$e (ro)le'&

!o "no# the analyti$al tool o% inter%eren$e

(ro)le'&

!o )e a)le to hanle $o''on inter%eren$e

(ro)le's.


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+ontents

*S, -reuenc llocation

Pheno"ena & +lassification of Interference

-low of /andlin Interference Proble"

naltical ,ethods of Interference Proble"

!ical +ases


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-reuencand

2 -reuenc$2

-reuenc$u!le3Inter'al

and 4idth+arrier

-reuencInter'al

*+S,+S,900

0 ,/ 91,/

92 ,/90,/

4 ,/ 3 ,/ 200 "/

56S100

1710 ,/17,/

10,/10,/

9 ,/ 7 ,/ 200 "/


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+ontents





!ical +ases


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Pheno"ena of Interference

6all ro(

Una)le to

esta)lish $alls,etalli$ noise

On-an-o%%

s(ee$h

Poor

s(ee$h8uality

Pheno'ena


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+lassification of Interference

Internal inter%eren$e

Internal inter%eren$e re%ers to unreasona)le

%re8uen$y (lanning an e8ui('ent har#are %aults

#hi$h $oul lea to e$rease in net#or" ser:i$e

8uality.

*;ternal inter%eren$e

*;ternal inter%eren$e re%ers to un"no#n signal sour$e

out o% the net#or" #hose e;isten$e $oul seriously

istur) the net#or"


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Internal Interference 5+auses

Unreasona)le %re8uen$y (lanning

*8ui('ent %aults

S"i(-one $o:erage

Internal

inter%eren$e


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Internal Interference

5$ue to nreasonable -reuenc Plannin

Unreasona)le %re8uen$y (lanning = Fre8uen$y an a>a$ent $ell relation 'ay

)e set unreasona)le in net#or" (lanning

)e$ause o% (lanning tools or hu'an

'ista"es .

Inter%eren$e #ill )e re%le$te in too large

5L?R;@uality ,S una)le to a$$ess into

net#or" (oor s(ee$h 8uality an $all ro(.


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Internal Interference

5$ue to nreasonable -reuenc Plannin

6he$" an $on%ir' (ro)le'= Use (lanning tool to $he$" i% $o-$hannel e;ists&

$o-$hannel is easy to )e ete$te i% it oes e;ist.

As %or $ells in )ounary areas #e $an )lo$" $o-

$hannel $ells in the net#or"& 'ean#hile 'a"e

tra$ing test #ith 5! e:i$es at areas #ith

e'ergen$e o% large 5L?R;@uality. I% $o-$hannel

inter%eren$e oes e;ist the 5L?R;@uality :alue

shall )e$o'e s'aller a%ter the )lo$"ing o% $o-

$hannel $ells thus #e $an a>ust the $ell


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Internal Interference 5$ue to Ski!67one

+o'erae

Inter%eren$e $ause )y s"i(-one

$o:erage I% the a$tual $ell $o:erage greatly e;$ees

re8uire'ent inter%eren$e #ill )e in$rease. In$orre$t setting o% engineering an

net#or" (ara'eters 'ay lea to s"i(-one

$o:erage.


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Internal Interference 5$ue to Ski!67one

+o'erae Unreasona)le setting o% engineering (ara'eters

rong antenna ty(e o#n-tilt an ai'uth 'ay result

in o:er large $ell $o:erage #hi$h e;$ees a$tual

$o:erage nee

Unreasona)le setting o% net#or" (ara'eters Bet#or" (ara'eters in$lue= 'ini'u' a$$ess le:el

C!S trans'ission (o#er ,S 'a; trans'ission

(o#er hano:er threshols et$. I'(ro(er setting o%

these (ara'eters #ill result in s"i(-one $o:erage(ro)le' an inter%eren$e as #ell


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Internal Interference 5$ue to 8ui!"ent

-ault

Inter%eren$e $ause )y e8ui('ent

%ault=

Raio %ault o% C!S is 'ainly $ause )y

e%e$ti:e UL unit (arts.


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83ternal Interference

5e%inition= *;ternal inter%eren$e re%ers to other inter%eren$es

$ause )y e;ternal %a$tors )ut not ue to e8ui('ent%ault or unreasona)le %re8uen$y (lanning.

6o''on e;ternal inter%eren$es= ue to #ie-)an re(eater&

ue to 65,A syste' Dtrailing signalE&

ue to signal >a''er&

6hara$teristi$=

It


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+ontents





!ical +ases


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6on%ir'inter%eren$e

range

6he$"

%re8uen$y$hange

%re8uen$y

(oints

*n

Poor

s(ee$h8uality ue

to

inter%eren$e

6he$"

an

$hange

!R

6he$"e;ternal

inter%eren$e

6he$"

GSRHantennaHi:ierHu

(le;er

One cell

Interference

e3ists

One

R9

Interference

e3istsInterference

e3ists

Any ne# sites I% thorough$hange o% %re8uen$y (ara'eters

ta"en re$ently

Se'eral

cells


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+ontents





!ical +ases


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Analyti$al

,ethos o%

Inter%eren$e

Pro)le'

Statisti$al

analysis o%

net#or"

(er%or'an$e

ini$ators

Analysis o%

(ara'eter

$he$"ing

In:estigation

o% har#are

%ault

5ri:e !est

an 5ialing

!est

*;ternal

inter%eren$e

test


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6 Statistical nalsis of Network Perfor"ance

IndicatorsStatisti$al analysis o% net#or" (er%or'an$e ini$ators

Statisti$s o% inter%eren$e )an = hen !6/s are in ilestatus UL noiseHinter%eren$e is $onstantly )eing 'easure

)y C!S an the 'easure'ent result #ill )e analye aninter%eren$e le:el #ill )e sent to CS6 in le:els.

Statisti$s o% hano:er ue to ULH5L inter%eren$e = e $an>uge #hether inter%eren$e e;ists through statisti$s o%hano:er $ause )y ULH5L inter%eren$e.

6olle$tion o% ULH5L R@ sa'(les uring s(ee$hes =R;@ual is an ini$ator to re%le$t s(ee$h 8uality #hi$h is)ase on error rate an %alls into graes D0 7E.


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6 Statistical nalsis of Network

Perfor"ance Indicators 6orres(oning relation )et#een R;@ual an C*R


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6 nalsis of Para"eter +heckin

6he$"

(ara'eters

relate to

trans'itting

(o#er

6he$"

(ara'eters

relate to

trans'itting

(o#er

6he$" antenna

engineering

(ara'eters

6he$" antenna

engineering

(ara'eters

6he$" %re8uen$y

(lanning

(ara'eters

6he$" %re8uen$y

(lanning

(ara'eters

6he$"

(ara'eters

relate to s"i(-

one $o:erage

6he$"

(ara'eters

relate to s"i(-

one $o:erage

Para'eter $he$"ing


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6 +heckin hardware fault

6he$"ing har#are %ault

O,6R #arning analysis6he$"ing latent e8ui('ent %ault


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6 +heckin 2atent 8ui!"ent -ault

Clo$" the t#o

in(ut #ays o%

!R o)ser:e

UL inter%eren$e

)an& i% it


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6 $ri'e est and +all :ualit est

$ri'e est and +all :ualit est 5ri:e test $an e%%e$ti:ely ete$t the lo$ation an

egree o% inter%eren$e #hi$h is $on:enient %or

analying the $ause o% inter%eren$e.

In 6@! #e $an a$tually %eel the s(ee$h 8uality

at areas )eing inter%ere an #e $an see $all

8uality $lass on the test (hone.


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6 $ri'e est and +all :ualit est 5! (ara'eters=

6HI= $o-$hannel $arrier-to-inter%eren$e ratio

R3:ual 0 1 ; < = > ? @

6HIJCK 23 19 17 1 13 11 4


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6 $ri'e est and +all :ualit est

5! Para'eters= S@I SP**6/ @UALI! IB5* is the $o'(rehensi:e

es$ri(tion o% C*R F*R an /AB5OG*R *G*B! )y !*,S.


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6 est of 83ternal Interference

6on%ir' e;ternal inter%eren$e #ith SI!*,AS!*R = !est o% UL inter%eren$e 6onne$t the in(ut (ort o% %re8uen$y-s#ee(

generator to the out(ut (ort o% i:ier to in$reasethe egree o% sensiti:ity as sho#n in the %igure.


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6 est of 83ternal Interference 6on%ir' e;ternal inter%eren$e #ith SI!*,AS!*R =

(ersistent strong le:el e;ists #ithin the )an#ith o%

20,/ #e $an $on$lue that serious UL inter%eren$e

e;ists.


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6on%ir' e;ternal inter%eren$e #ith C!20= ,a"e UL inter%eren$e analysis o% +S, 900, UL %re8uen$y )an #ith

%re8uen$y s$anning 'eter-Bet!e" Analyer D!*M $o'(anyE. !he 'oel#e usually use is C!20.

6onne$tion 'etho o% C!20=

One is to use its o#n test antenna

One is to o)tain inter%eren$e in%or'ation through $onne$tion to the

out(ut (ort o% i:ier.


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6onne$tion 'etho using C!20 to test UL inter%eren$e=

Antenna

65U

C! 20

Feeer


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6 est of 83ternal Interference a:e gra(h o% UL inter%eren$e teste )y C!20=

!his out(ut is the a:erage :alue o% the test results o% one 'inute #hi$h

sho#s the %re8uen$y an strength o% inter%eren$e. Persistent o)ser:ation

is neee to $on%ir' i% the inter%eren$e $ontinues.


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!i'e s$atter gra(h o% UL inter%eren$e teste )y C!20= !*M %re8uen$y s$anning 'eter %eatures in three i'ensional re$oring o%

ti'e %re8uen$y an signal. !he :erti$al )ol re lines in the gra(h

re(resent the ti'e uration signal le:el strength an %re8uen$y.

:erti$al

a;isNti'e

6olor

s(e$tru'Nstrength

horiontal

a;isN%re8uen$y


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+ontents





!ical +ases


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!ical +ase 1A Proble" $escri!tion

Sin$e ,ar$h 200 an o(erator has re$ei:e a lot o%

$o'(laints a)out (oor s(ee$h 8uality& so'eti'es

$alls e:en $ouln


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!ical +ase 1A Proble" nalsis

At the

)eginning #e

thought it #as$ause )y

(oor signal.

A%ter on-site

test #e %oun

it #asn


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!ical +ase 1A Proble" /andlin Process

BSte! 1!est UL inter%eren$e #ith C!20 $onne$te to 65U. 65,A #a:e %or'#as strong #hen #a:e %ilter #asn


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BSte! 1In the three i'ensional gra(h o% inter%eren$e teste )y C!20 the

65,A #a:e %or' #as strong an the #a:e %or' o% +S, )a$"groun

noise on the right #as high in a long (erio o% ti'e.

I t l U O l


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BSte! ;

Use 65,A #a:e %ilter to eli'inate 65,A inter%eren$e.

Anten

na

6o''on

65U

C! 20

Feeer

65,A #a:e

%ilter

Internal Use Only


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!ical +ase 1A Proble" /andlin ProcessB

Ste! ; hen 65,A #a:e %ilter #as ao(te 65,A #a:e %or' #aso):iously #ea"ene )ut it #as still strong at so'e $ertain(oint& the )a$"groun noise in +S, %re8uen$y )an #as also

reu$e.

Internal Use Only


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BSte! ;Ce$ause o% 65,A #a:e %ilter the UL inter%eren$e in +S,

%re8uen$y )an reu$e greatly.

Internal Use Only


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BSte!

GSM RNO Training-Network Interference and Solutions_R1.0

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