Guide to Locating GSM BSS Interference Sources V1[1].0 201101

8/12/2019 Guide to Locating GSM BSS Interference Sources V1[1].0 201101

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Product Name Confidentiality Level

GSM BSS INTERNAL

Product VersionTotal !a"esV#$%

Guide to Locating GSM BSS InterferenceSources

For internal use only

Pre!ared &y GSM Performance 'Researc( )e!artment )ate $*+*,*%,+*

Revie-ed &y )ate

Revie-ed &y )ate

Granted &y )ate

Huawei Technologies Co., Ltd.

All rights reser ed


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Change History

!ate "e ision #ersion Change !escri$tion Author

$*++,*+ +.* Com!leted t(e draft. /u 0in"1 2u Guolian"1 3en" S(u4in"


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%eywords& interference

A'stract&

T(is document !rovides met(ods for 5uic6ly locatin" interference !ro&lems. 2it( it1 fielden"ineers can !reliminarily analy7e t(ese !ro&lems and solve certain ones 5uic6ly1 as -ell asdifferentiate onsite net-or6 o!timi7ation1 customer service1 and R') trou&les(ootin".

A''re iations and Acrony(s

A

AMR Ada!tive Multi,Rate Codec

B

BSC Base Station Controller BTS Base Transceiver Station

C

C)MA Code )ivision Multi!le Access

CME Confi"uration Mana"ement E8!ress

)

)B )eci&el

)T/ )iscontinuous Transmission

G

GSM Glo&al System for Mo&ile Communications

I

ICC Interference Cancel Com&in"

I9 Interference 9re5uency

:

:PI :ey Performance Indicator

L


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LMT Local Maintenance Terminal

LNA Lo-er Noise Am!lifier

M

MR Measure Re!ort

MS Mo&ile Station

R

RB2 Resolution Band 2idt(

R9 Radio 9re5uency

RMS Root Mean S5uare

T

TC; Traffic C(annel


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Guide to Locatin" GSM BSS Interference Pro&lems 9i"ures

Contents

) !ocu(ent !escri$tion.................................................................................................................)*)

+ er iew of Interference -ro'le(s............................................................................................+*)$.+ Im!acts of Interference on BSC :PIs............................................................................................................$,+

$.$ Classification of GSM Interference Sources................................................................................................ ..$,$$.$.+ Antenna Passive Intermodulation..........................................................................................................$,$

$.$.$ C)MA Net-or6 Interference................................................................................................................$,

$.$. Co,c(annel and Ad4acent C(annel Interference....................................................................................$,1 t(e C)MA net-or6 and GSM net-or6 are co,de!loyed1 or t(e antenna cou!lin" isinsufficient. Con"estion interference affects all GSM fre5uencies. T(e interference isclosely related to C)MA traffic. T(e interference is stron" -(en t(e C)MA traffic is(eavy. T(e fre5uencies in a cell close to t(e C)MA fre5uency &and are affected.

S!urious emissionF If t(e s!urious emission of t(e !ort on to! of t(e C)MA transmitterdoes not e8ceed limits s!ecified in related !rotocols or t(e state radio re"ulatorycommission1 or if t(e GSM BTS and C)MA NodeB are too close1 C)MA s!urioussi"nals affect t(e sensitivity of receive c(annels.

Intermodulation interferenceF Multi!le C)MA si"nals on receive c(annels of t(e Lo-er Noise Am!lifier =LNA> may "enerate t(ird, or fift(,order intermodulation !roducts1-(ic( may cause interference for fre5uencies on t(e live net-or6. T(e interference "etsstron"er t(e closer t(e receive GSM fre5uencies are to t(e C)MA transmit fre5uency

&and. Interference is related to C)MA traffic volume. T(e interference "ets stron"er t(e(eavier t(e C)MA traffic.

9i"ure +.+ s(o-s t(e C)MA net-or6 interference s!ectrum.

Figure ).) C)MA net-or6 s!ectrum

2.2.3 Co*channel and Ad8acent Channel Interference9re5uencies are al-ays reused in GSM net-or6s. If t(e distance &et-een t-o cells usin" t(esame or ad4acent fre5uencies is muc( s(orter t(an t(e cell radius1 t(e fre5uency reuse is li6elyto cause co,c(annel and ad4acent c(annel interference. In addition1 radio fre5uencies reflected

&ac6 from tar"ets t(at radar o!erators are not interested in1 called clutter1 can also cause co,c(annel and ad4acent c(annel interference. 2(en C I +$ dB or C Ia , dB1 interference

occurs.

$*++,* ,*# ;ua-ei Tec(nolo"ies Pro!rietary


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< See6in" ;el! for Pro&lem Escalation Guide to Locatin" GSM BSS Interference Pro&lems

2.2.4 Inter*networ0 Interference 9fro( High -ower !e ices:T(e decimeter -ave radar desi"ned in t(e seventies and ei"(ties o!erates on t(e same orad4acent fre5uencies as t(e GSM. T(e decimeter -ave radar transmits at (i"( !o-erran"in" from tens to (undreds of 6ilo-atts1 resultin" in a "reat volume of out,&ands!urious emission1 -(ic( can easily !roduce interference for near&y BTSs.

Cordless tele!(ones o!eratin" at #** M;7F T(e &and-idt( for analo" and di"italcordless tele!(ones is * :;7 and $ M;71 res!ectively. T(e o!eratin" fre5uency &and isfrom #*$ M;7 to #$* M;7 in 9; mode. 2(en t(e outdoor antenna used &y cordlesstele!(ones transmits at (i"( !o-er1 near&y BTSs may e8!erience interference.

Re!eater interferenceF Re!eaters are used in t(e early !(ase of net-or6 de!loyment toe8tend BTS covera"e. Re!eaters !roduce interference for BTSs -(en im!ro!erlyinstalled or -(en t(ere is insufficient isolation &et-een t(e donor antenna and t(e serviceantenna1 causin" self oscillation. T(e intermodulation si"nal level of re!eaters usin" non,linear -ide,&and am!lifiers is muc( "reater t(an t(e standard level. A (i"( volume ofintermodulation com!onent is "enerated -(en re!eaters -or6 at (i"( !o-er1 -(ic( may

cause interference to near&y BTSs. In a cascaded re!eater1 si"nals of t(e same fre5uencyare am!lified. T(e am!lification ta6es time1 and t(erefore some time !asses &et-eendifferent se"ment si"nals. 2(en t(is interval e8ceeds t(e !eriod defined in t(e GSMsystem1 co,c(annel interference is !roduced.

@t(er radio devices usin" t(e same fre5uency &and and interference unitsF Certain radiodevices use t(e GSM fre5uency &and and1 in doin" so1 !roduce interference.

2.3 Standards for !eter(ining GSM Interference!lin6 interference is li6ely to occur in a cell -(en t(e follo-in" conditions are metF

T(e rate of u!lin6 interference &ands 1 is "reater t(an $** and t(e rate of u!lin65uality levels and D is (i"(er t(an ?H after analy7in" t(e TC;9 Receive LevelMeasurement !er TR/ and TC;; Receive Level Measurement !er TR/.

If t(is is t(e case1 trou&les(oot t(e affected BTSs.

)o-nlin6 interference is li6ely to occur in a cell -(en t(e follo-in" conditions are metF

T(e num&er of TR/ MRs is "reater t(an $** and t(e rate of do-nlin6 5uality levels and D is(i"(er t(an ?H after analy7in" t(e TC;9 Receive Level Measurement !er TR/ and TC;;

Receive Level Measurement !er TR/.If t(is is t(e case1 trou&les(oot t(e affected BTSs.

T(e !recedin" standards are "enerally only a!!lica&le to ur&an areas. T(e standards for su&ur&an areasand indoors are not currently availa&le &ut -ill &e !rovided in su&se5uent documentation. In t(e interim1t(ese areas ado!t t(e standards for ur&an areas.

2.4 A$$lication Scenarios

T(is document is a!!lica&le to cells e8!eriencin" severe interference and interference areas inMRs.

< ;ua-ei Tec(nolo"ies Pro!rietary $*++,* ,*#


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3 Trou'leshooting Interference -ro'le(s3.1 erall Trou'leshooting -rocedure

9i"ure +.+ s(o-s t(e overall trou&les(ootin" !rocedure.

In 9i"ure +.+1 diamonds indicate nodes in t(e trou&les(ootin" !rocedure rectan"les indicatet(e trou&les(ootin" !rocedure to consult after confirmin" t(e !ro&lem.


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Figure ).) Trou&les(ootin" flo-c(art

3.2 Standards for Identifying Ty$ical Interference -ro'le(s

3.2.1 Standards for Identifying ;$lin0

Measurements in t(e traffic statistics re!ortF

Interference Band Measurement !er TR/ in MR Measurement

Receive Juality Measurement !er TR/

$. Identification met(ods

!lin6 interference is li6ely to occur in a cell -(en t(e follo-in" conditions are metF

T(e rate of u!lin6 interference &ands 1


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Guide to Locatin" GSM BSS Interference Pro&lems ? References

)o-nlin6 interference is li6ely to occur in a cell -(en t(e follo-in" conditions are metF

T(e num&er of TR/ MRs is "reater t(an $** and t(e rate of do-nlin6 5uality levels and D is (i"(er t(an ?H after analy7in" t(e TC;9 Receive Level Measurement !er TR/and TC;; Receive Level Measurement !er TR/.

. Tools involvedM$***


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fre5uencies1 and t(e noise floor level is (i"(er t(an ,#$ dBm in five consecutivefre5uencies in AR9CN + to AR9CN ?*1 t(ere is C)MA net-or6 interference1 as s(o-nin 9i"ure $.+ .

Figure +.) C)MA net-or6 interference si"nals o&tained t(rou"( u!lin6 fre5uency scan

. Tools involved

LMT


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Figure +.) Inter,net-or6 interference s!ectrum

.$.< ISte! +9i"ure $.+ s(o-s -(at u!lin6 inter,net-or6 interference loo6s li6e on t(es!ectrum analy7er.

Figure +.+ Vie-in" t(e interfered fre5uency &and usin" t(e s!ectrum analy7er

Interference for some of fre5uencies s(ares similar features -it( t(at of a fre5uency &and. T(e fi"ure s(o-s t(at t(e noise floor of t(e fre5uency &and1 (o-ever1 is (i"(er.

. Tools involved

LMT


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3.2.6 Standards for Identifying !ownlin0 Inter*7etwor0Interference

+. In!ut

Traffic statistics and en"ineerin" !arameters

$. Identification met(ods

@&serve t(e relations(i! &et-een t(e traffic volume and t(e rate of receive 5ualitylevels and D in t(e Receive Juality Measurement !er TR/1 and t(e relations(i!

&et-een t(e traffic volume and t(e rate of interference &ands to ? in t(eInterference Band Measurement !er TR/ for $< (ours. If t(e traffic volume is closelyrelated to t(e interference &and and receive 5uality1 for e8am!le1 -(en traffic is lo-at *+F**1 t(e rate of receive 5uality levels and D in t(e Receive JualityMeasurement !er TR/ is far smaller t(an t(e rate in &usy (ours. In t(is case1 t(ere isintra,net-or6 interference.

Im!ort t(e en"ineerin" !arameters of t(e !ro&lem cell and nei"(&orin" cells to t(e Nastar !latform. se t(e Nastar fre5uency c(ec6 function to c(ec6 -(et(er t(e !ro&lem cell and t(e cells in ad4acent or remote BTSs (ave sectors in o!!osition toeac( ot(er usin" t(e same or ad4acent fre5uencies -(ic( are e8!eriencin" severeinterference.

Figure +.) C(ec6in" fre5uency distri&ution usin" Nastar

. Tools involved

Nastar !latform


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Interference Band Measurement !er TR/ in MR Measurement1 Receive JualityMeasurement !er TR/1 and traffic volume in cells.

Relations(i! &et-een traffic volume and t(e Receive Juality Measurement !er TR/1and relations(i! &et-een traffic volume and t(e Interference Band Measurement !er

TR/.Screens(ot of fre5uency c(ec6 result on t(e Nastar !latform

3.2.7 1li(inating ;$lin0 Interference in BatchesTo ena&le field en"ineers to efficiently eliminate u!lin6 interference1 t(e R') !ersonneldevelo!ed a tool to su!!ort onsite o!erationsF 9r5lo"Analyse. 9or t(e installation files andinstructions1 see t(e a!!endi8es.

3.3 Trou'leshooting Co((on Interference -ro'le(s

3.3.1 1li(inating Antenna Inter(odulation Interference+. In!ut

2(en traffic is lo- in t(e early mornin"1 start a )ummy Burst test. Collect interference &and traffic statistics or t(e interference &and in real time &efore and after initiatin" t(e)ummy Burst test1 to determine -(et(er t(e BTS is e8!eriencin" intermodulationinterference.

$. Procedure

T(e trou&les(ootin" met(ods de!end on t(e tools availa&le on site. If t(ere is a lo-,intermodulation load or s!ectrum analy7er1 see t(e Guide to %liminating U lin!

Intermodulation Interferen#e from t&e B'$ by Using t&e o -intermodulation oad ort(e Guide to o#ating U lin! Intermodulation Interferen#e by Using t&e $ e#trum *naly+er in t(e a!!endi8 as needed for t(e !rocedure for eliminatin" antennaintermodulation.

2(en t(ere is no tool availa&le on site1 you can re!lace t(e faulty feeder and antenna tolocate t(e fault se"ment &y se"ment.

nli6e macro BTSs1 intermodulation is muc( more com!le8 for indoor,distri&utedBTSs. 9or t(is reason1 locate t(e fault se"ment &y se"ment &ased on t(e indoordistri&ution dia"ram. 9or t(e s!ecific !rocedure for locatin" t(e fault1 see t(e "uide in t(ea!!endi8. If t(e source of t(e intermodulation interference is a &ac6&one am!lifier orre!eater1 consult t(e com!onent manufacturer to ad4ust t(e u!lin6 do-nlin6 "ain orre!lace t(e com!onent if necessary.

. Tools involved

S!ectrum analy7er1 lo-,intermodulation load1 R9 ca&le of lo-,intermodulation1 -renc(1industrial alco(ol1 and tools used to ma6e 4um!er connectors.


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$. Procedure

@n t(e s!ectrum analy7er1 set t(e fre5uency ran"e to % * M;7 to # * M;71 referencelevel to * dBm1 resolution &and-idt( =RB2> to +** :;71 and detection met(od toRMS.

Connect one R/K@ T !ort of t(e ))P )9C MR9 MRR to t(e s!ectrumanaly7er usin" an R9 ca&le -it( an R9 conversion connector.

Searc( for t(e C)MA main si"nal on t(e s!ectrum analy7er1 and mar6 t(e si"nal1 findout t(e stron"est si"nal !oint1 and record its !o-er. If t(e !o-er is more t(an ,$*dBm and t(e interference &and of some fre5uencies =es!ecially t(e fre5uencies infre5uency &and E> is relatively (i"( &efore a )ummy Burst test is initiated1 add afilter on t(e main and diversity !orts on to! of t(e ca&inet to filter C)MA si"nals.

. Tools involved

S!ectrum analy7er1 conversion connectors of various models =conversion connectormodels vary -it( R9 modules>1 and R9 ca&le =connectin" t(e R/K@ T !ort of t(e R9module to t(e s!ectrum analy7er>.


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-ara(eterTy$e

-ara(eter7a(e

"eco((ended #alue !escri$tion

Po-er control Po-er ControlAl"orit(mS-itc(

; A2EI III Po-erControl Al"orit(m

Po-er control al"orit(m.

; A2EI IIIPo-er ControlAl"orit(m@!timi7e S-itc(

@n T(is !arameter and t(e; A2EI III Po-erControl !arameter are setto ena&le III E !o-ercontrol.

)iscontinuoustransmission=)T/>

TC; 9 !lin6)T/

S(all se )iscontinuoustransmission canefficiently decreasenet-or6 interference.

TC; ; !lin6)T/

S(all se )iscontinuoustransmission canefficiently decreasenet-or6 interference.

se TC; ;)o-nlin6 )T/

es )T/ s(ould &e ena&ledon t(e core net-or6.

se TC; 9)o-nlin6 )T/

es )T/ s(ould &e ena&ledon t(e core net-or6.

. Tools involvedLMT and CME


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)escri!tion

*F off

+F on=defaultvalue>

*F on

+F off=defaultvalue>

**F default !arameter of &adframe filter ne-al"orit(m

*+F &ac6u! !arameter $ of &ad frame filterne- al"orit(m

+*F &ac6u! !arameter + of &ad frame filterne- al"orit(m

++F default !arameter of &adframe filter oldal"orit(m

*F on =)Bdomainfilter1 ne-al"orit(m>

+F off=linearfilter1default oldal"orit(m>

None **F +%* 6;7

*+F invalid

+*F $** 6;7

++F $ * 6;7=defaultvalue>

. 9or details on (o- to set t(is !arameter1 see t(e Guide to ,odifying $oft are arameter ./ .

3.3.4 1li(inating ;$lin0 and !ownlin0 Intra*networ0 Interference+. In!ut

Basis for determinin" t(is interference1 en"ineerin" !arameters1 and nei"(&orin" relationta&le.

$. Procedure

C(ec6 t(e !arameter settin"s &ased on section . . Settin" Anti,InterferenceParameters .

se t(e fre5uency o!timi7ation function on t(e old Nastar !latform.

a. C(oose 7astar Fre=uency Analysis Fre=uency o$ti(i>ation chec0 .

&. Set t(e fre5uency covera"e and fre5uency ran"e.

c. @n t(e Nastar interface1 select t(e cell -(ose fre5uency needs to &e o!timi7ed.9re5uency information for t(e nei"(&orin" cells and idle fre5uency information isdis!layed. ou can select a fre5uency from t(e idle fre5uencies for o!timi7ation.

$*++,* ,*# ;ua-ei Tec(nolo"ies Pro!rietary ++


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Figure +.) C(ec6in" fre5uency distri&ution usin" Nastar

@n t(e ne- Nastar !latform1 o!timi7e fre5uencies &y re!lacin" t(e fre5uency -it(t(e most interference -it( t(e fre5uency -it( t(e least interference.

+$ ;ua-ei Tec(nolo"ies Pro!rietary $*++,* ,*#


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Figure +.+ @!timi7in" fre5uencies usin" Nastar

. Tools involved

@ld Nastar !latform and ne- Nastar !latform.


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After learnin" t(e interference occurrence feature1 you can searc( for t(e interferencesource on site. To !reliminarily determine t(e !osition of t(e interference source1

!erform t(e searc( -(en interference is stron"est. 9rom t(e roofto! of a &uildin" in t(eran"e of t(e interference1 use a !orta&le s!ectrum analy7er and a a"i, da antenna totrian"ulate t(e source of t(e stron"est interference. Set t(e fre5uency ran"e on t(es!ectrum analy7er to t(e u!lin6 o!eratin" fre5uency of t(e TR/. ;old t(e antenna indifferent directions1 o&serve t(e c(an"es in interference si"nal am!litude to determinet(e direction -(ere interference is stron"est =a com!ass is recommended>1 and record it.T(e tolerance of t(e antenna is less t(an * de"rees. T(e o&servation time is $ to ?minutes at &est.

If you !erform t(e test near a BTS1 t(e s!ectrum analy7er may detect its do-nlin6 si"nals1 causin"t(e noise floor of t(e analy7er to increase. As result1 -ea6er interference si"nals cannot &e detected.

ou can use a !ass&and filter -it( t(e u!lin6 !ass&and of t(e BTS to -ea6en t(e do-nlin6 !o-er.

If t(e s!ectrum analy7er detects no interference si"nals1 ena&le t(e am!lifier and set t(e attenuator to* dB to lo-er t(e noise floor. Note t(at reducin" t(e RB2 to lo-er t(e noise floor (el!s detectnarro-&and interference si"nals1 &ut does not (el! detect &road&and interference si"nals

Because t(e a"i, da antenna is !olari7ed1 you must lay t(e antenna (ori7ontally and (old itvertically durin" testin"1 and ad4ust t(e antenna direction to identify t(e stron"est interference si"nal.

Re!eat t(e !recedin" test ste!s in a nei"(&orin" sector t(at is also affected. ou can uset(e results o&tained from t(e first and second tests to trian"ulate t(e location of t(estron"est interference si"nal.

T(e interference trou&les(ootin" solution de!ends on t(e interference source. 9ore8am!le1 if t(e source of t(e interference is a re!eater1 you need to consult t(emanufacturer for !rocessin".

1li(inating Interference fro( Indoor*!istri'uted BTSs

Indoor,distri&uted BTSs are com!le81 -it( many ca&les1 connectors1 and multi!le systems.T(erefore1 t(e !rocedure for eliminatin" u!lin6 interference is also com!le8. Generally1 t(esource of t(e interference is a re!eater or &ac6&one am!lifier. ou can use t(e trian"ulationmet(od to eliminate t(e interference. T(e !rocedure is as follo-sF

se eit(er of t(e met(ods descri&ed in section .$.$ Standards for Identifyin" AntennaIntermodulation Interference to determine t(at t(e interference &and increase is caused

&y intermodulation of t(e indoor,distri&uted BTS system. T(en1 eliminate t(e !ro&lem.

Based on t(e system dia"ram of t(e indoor,distri&uted BTS -it( t(e a&normalinterference &and1 disconnect t(e &ranc(es of t(e s!litter nearest to t(e BTS1 and connectt(e s!ectrum analy7er to t(e R/K@ T !ort of t(e R9 module and o&serve t(einterference si"nal c(an"e. Re!eat t(ese ste!s for eac( individual s!litter. Alternatively1disconnect t(e &ranc(es of t(e s!litters &ased on t(e interference &and and o&serve t(einterference si"nal c(an"e.

After determinin" t(e s!litter in t(e indoor,distri&uted BTS system t(at is e8!eriencin"interference1 re!eat t(e !recedin" ste!s to find out t(e interference source usin" t(esystem dia"ram.

If t(e source of t(e interference is a re!eater or &ac6&one am!lifier1 contact t(e indoor,distri&uted BTS manufacturer to ad4ust t(e u!lin6 do-nlin6 c(annel "ain or re!lace t(ere!eater or &ac6&one am!lifier if necessary.

;$lin0 Interference Band Increase Caused 'y "e$eater

T(e GSM net-or6 is t(e most li6ely to e8!erience interference. T(e follo-in" section

descri&es features of t(e re!eater. T(e re!eater increases not only t(e u!lin6 level &ut also t(e

+< ;ua-ei Tec(nolo"ies Pro!rietary $*++,* ,*#


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u!lin6 noise floor. T(e re!eater fre5uency can eit(er &e &road&and or customi7ed. T(e &road&and re!eater is more -idely used. T(e &road&and re!eater am!lifies si"nals for t(e-(ole receive fre5uency &and or s!ecified fre5uency &and. T(e customi7ed re!eater1(o-ever1 only am!lifies si"nals for s!ecified fre5uencies.

If t(e re!eater !roduces interference for t(e -(ole receive fre5uency &and1 t(e noise floor is"reatly increased &ut t(e increase am!litude is &asically unc(an"ed. A customi7ed &road&andre!eater =for e8am!le1 t(e $? M;7 re!eater &y C(ina Mo&ile> "reatly am!lifies t(e noise floor for a s!ecified fre5uency &and1 &ut t(e increased noise floor is &asically unc(an"ed1 as s(o-nin 9i"ure +.+ F

Figure ).) Re!eater interference s!ectrum

If t(e &road&and si"nal t(at increases t(e noise floor is &eyond t(e ran"e of t(e GSM receivefre5uency &and1 t(e GSM re!eater is not t(e source of t(e &road&and interference si"nal.

3.3.6 1li(inating !ownlin0 Inter*networ0 Interference+. In!ut

Cells sus!ected of do-nlin6 interference

$. Procedure

;i"(li"(t t(e cells sus!ected of do-nlin6 interference on a di"ital ma!1 and identifyt(e "eneral "eo"ra!(ical !osition of t(e interference source &ased on its interferencesco!e.

Analy7e traffic statistics to find out t(e time features of do-nlin6 interferenceoccurrence. Perform a drive test -(en do-nlin6 interference is most li6ely to (a!!en.

Bind t(e test terminal to t(e cell &ein" tested1 disa&le t(e do-nlin6 !o-er control and)T/1 !erform dialin" tests for fre5uencies one after anot(er1 and record t(e receivedo-nlin6 level.

S!ecify a TR/ for t(e cell &ein" tested1 cut t(e !o-er su!!ly1 use a TEMS to !erforma do-nlin6 fre5uency scan1 and record t(e level of eac( fre5uency e8!eriencin"interference. 9or details on (o- to use a TEMS to !erform do-nlin6 fre5uency scan1see t(e Guide to erforming Fre"uen#y $#an on t&e '%,$ ,obile &one in t(ea!!endi8.

Calculate t(e C I of eac( fre5uency in t(e cell. If C I +$ dB1 t(e cell is e8!eriencin"do-nlin6 interference.

. Tools involved

$*++,* ,*# ;ua-ei Tec(nolo"ies Pro!rietary +?


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TEMS mo&ile !(one and t(e matc(in" TEMS soft-are


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4 See0ing Hel$ for -ro'le( 1scalation4.1 Interference Trou'leshooting Chec0list

9ield en"ineers s(ould !rovide an analysis re!ort for t(e trou&les(ootin" !rocedure &eforesu&mittin" a 5uestion s(eet. Based on t(e analysis re!ort1 R') en"ineers can focus on ma4or

!ro&lems1 s(ortenin" t(e time necessary to locate t(e !ro&lem.

7u('er Chec0 Ite( ut$ut A$$licationScenario

1?ecution"esult

"e(ar0s

+ Traffic statistics1includin" all:PIs

Basis for determinin"u!lin6 do-nlin6 interference

Cells -it( severeinterference andinterference areas

in MRs

$ Antennaintermodulation

Trou&les(ootin" !rocedurefor antenna intermodulation1and &asis for determinin"-(et(er antennaintermodulation e8ists

Cells -it( severeinterference andinterference areasin MRs

C)MA net-or6interference

Trou&les(ootin" !rocedurefor C)MA net-or6interference1 and evaluationof t(e C)MA net-or6interference to t(e GSM BTSs


< )o-nlin6 u!lin6 intra,net-or6interference

Trou&les(ootin" !rocedurefor u!lin6 do-nlin6 intra,net-or6 interference1 andtrou&les(ootin" result


? !lin6 inter,net-or6interference

Trou&les(ootin" !rocedurefor u!lin6 inter,net-or6interference1 andtrou&les(ootin" result



29/30


7u('er Chec0 Ite( ut$ut A$$licationScenario

1?ecution"esult

"e(ar0s

)o-nlin6 inter,net-or6interference

Trou&les(ootin" !rocedurefor do-nlin6 inter,net-or6interference1 andtrou&les(ootin" result


D Anti,interference !arameters

Trou&les(ootin" !rocedurefor anti,interference

!arameters1 andtrou&les(ootin" result


$ ;ua-ei Tec(nolo"ies Pro!rietary $*++,* ,*#


30/30


5 "eferences

+

Guide to DummyBurst Configurati

$

Guide toObserving Inband

Guide to#odifying "oft$ar

Date post:	03-Jun-2018
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Guide to Locating GSM BSS Interference Sources V1[1].0 201101

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