BEST-GSM-Q-A

8/9/2019 BEST-GSM-Q-A

1/21

QUESTION ANSWER

Can you list me the interfaces of aGSM networ!

Air" A#is" Ater" A" G#" Gi" Gn" G$" Gr" Gs

Can you list me the networelements of a GSM networ!

MS" %TS" %SC" MSC" SGSN"GGSN"%G"&'R"EIR"AUC"CG"'IG

What is the IMSI!

Uni(ue I$entifier for a SIM)* MS can #e +a,e$ with a

sin,le -AGING messa,e

What is the TMSI!TMSI in a 'ocation Area) Shorter so you can +a,e more

MS

When $o you use IMSI an$ whenTMSI!

Authentication" #ut #asically we care a#out it for +a,in,)-a,in, messa,e always contains IMSI

&ow many MS can you +a,e with *+a,in, messa,e $one w. IMSI!

/

&ow many MS can you +a,e with *+a,in, messa,e $one w. TIMSI!

0

-a,in, metho$! Can you chan,ethis metho$ w. %SS +arameters!

Either IMSI an$ . or TMSI 1 you can chan,e the metho$#y NSS +arameters

Name some of the CC& channels

RAC&" AGC&" -C& 1 there is also NC& #ut it is not

use$ 1

Which are the feature we ha2e in33333 in or$er to chan,e the CCC&

#eha2iour!

4efault -C& has always +riority o2er AGC&) Anyway youcan reser2e a certain num#er of #locs of AGC&)

&owe2er" if AGC& 56" AGC& has +riority o2er -C&

Which are the CCC& in U' an$which are in 4'!

U' 5 RAC& 4' 5 AGC&" -C&" 7NC&8

4e$icate$ Channels in GSM 9ACC&" SACC&" S4CC&" TC&

%roa$cast Channels in GSM %CC&" 9C&" C%C&" SC&

Which is the $ifference #etweenCONGESTION an$ %'OC:ING!

Con,estion 5 all resources in use) %'OC:ING 5 %loce$re(uests

&ow $o you measureCONGESTION in 33333!

secon$s

&ow $o you measure %'OC:ING in33333!

e2ents

Which is the unit of measure for the#locin, measurement!

* e2ent

Which is the measurement +erio$ forthe con,estion measurement!

*6 msec

Which is the measurement +erio$ forthe traffic measurement!

/6 sec

Which are the 33333 features to hel+S4CC& con,estion not to #ecome

S4CC& #locin,!

4ynamic S4CC&" 9ACC& Call Set U+

Which are the 33333 features to hel+TC& #locin,!

&R 7E9R an$ AMR8" 4R" 4A4'% 7actually this one a2oi$scon,estion to ha++en as well as traffic reason han$o2er8"traffic reason &O 7MSC initiate$8" AM& 7traffic reason &O"

%SC initiate$8

Which is the $ifference #etween4A4'% an$ 4R!

4R is tri,,ere$ when there is actual con,estion in theTC&s) 4A4'% is tri,,ere$ when the loa$ of the %TS is

a#o2e a certain threshol$ $efine$ as a +arameter)


2/21

Which ty+e of &O is tri,,ere$ w.4R!

S4CC& 3 TC& &O

Is 4R hel+ful for S4CC& or TC&con,estion!

TC& Con,estion

There are / timers an$ * threshol$you nee$ to $efine when you

acti2ate 4R 1 can you tell me whichare these +arameters an$ what are

these for!

Min Time 5 Time in or$er to i$entify nei,h#ours)

Ma; Time 5 ma; time to try &O)'e2el Threshol$ 5 Minimum Threshol$ of the nei,h#oursin or$er to try S4CC&3TC& &O

Which are the $ifferences #etween4R 7$irecte$ Retry8 an$ I4R7Intelli,ent 4irecte$ Retry8!

%asically I4R is an im+ro2ement of 4R an$ it taes intoaccount the Source Call Ty+e" Tar,et Cell Ty+e an$

Su#scri#er ty+e 1 anyway it is ne2er use$ 1

Which are the 4R +arameters younee$ to set!

Threshol$ 'e2elMin time 4RMa; Time 4R

Can you #riefly e;+lain to me the

%SC INITIATE4 TRA99IC &O!

%asically when the %TS loa$ is a#o2e the loa$ $efine$ #ya +arameter 7in AM& feature


3/21

Ma; $istance you can ee+ a call inGSM!

7what is the ma;imum 2alue oftimin, a$2ance in normal GSM cell!An$ what $oes it e(ui2alent to! 8

F TA )) E(ui2alent to D F@ m

Which networ element uses TA to

tae certain $ecisions! MS or %TS!

%asically MS sen$s its #ursts in a$2ance in or$er to ,et to

the %TS in the win$ow e;+ecte$ 1

What is the e;ten$e$ cell feature!Alows to ha2e $ou#le ma;imum $istance MS 3 %TS 1

theoretically 6 m 1 +ractically @ m

Is it a2aila#le in 33333! es 1

Which is the ca#inet . %SC you nee$to ha2e in or$er to mae E;ten$e$

Cell wor!

Ultrasite will su++ort it in S**)@) Tal 9amily su++orts itsince S

A$2anta,es an$ $isa$2anta,es ofthe MASTER3MASTER an$

MASTER3S'ABE confi,uration

%asically when you ha2e a MASTER" if this ,oes $ownalso the other ca#inet ,oes $own

4o you nee$ the Synch Ca#le

#etween ca#inets in or$er to sharethe T*!

no

Which is the #est confi,uration forca#inet synchroni=ation 7MASTER"

S'ABE" IN4E-EN4ENT8 if you $onust statistical

$istri#utionWhy you ha2e a $ifferent $istri#ution

#etween SU% an$ 9U'' R;Qualsam+les! 7&INT 3 It is a statistical

reason8

'ess sam+les 5 'ess relia#le 5 More $e2iation

What are %ER an$ %E-! %it Error Rate an$ -ro#a#ility

Can you e;+lain what is N%'Omeasurement an$ how it is use$!

It is use$ in C%CC& an$ it measures the $ifference#etween %CC& an$ non3%CC& layer


4/21

Which is the main a$2anta,e ofC%CC& Bs) Multi+le %CC&!

C%CC& a$2anta,e 5 Trunin, Gain J you can assi,n thecall to the sla2e 7e),) other layer8 w. call assi,nment w.o

usin, &OM%CC& a$2anta,e 5 Gi2e %CC& channel to #oth #an$s1 es+ecially here in US where there are a lot of le,acy

+hones in sin,le#an$ K *H66

Coul$ you +lease e;+lain the #asicsi,nallin, of a Mo#ile Ori,inate$ Call

Setu+!RAC&" AGC&" S4CC&" TC& 1

Coul$ you +lease e;+lain the #asicsi,nallin, of a Mo#ile Terminate$

Call Setu+!-C&" RAC&" AGC&" S4CC&" TC& 1

What are the im+ortant GSMs+ecifications for ra$io +erformance!

F)//" 0 series es+) 0)6? L 0)6" @ series es+ @)6?" @)6@

What is the channel s+acin, inGSM!

/66 &=

What is the $u+le; fre(uency ofGSm?@6 an$ GSM*H66!

0@ M&= for GSM?@6 an$ ?6 M&= for GSM*H66

in GSM" What is the multi+le accessan$ $u+le; use$!

94MA.T4MA with 944

What is AR9CN! What $oes itmean!

A#solure Ra$io 9re(uency Channel Num#er) %asically itis the fre(uency in use)

Is AR9CN 5 */6 in GSM?@6 orGSM*H66 #an$!

?@6

&ow many AR9CN $o you ha2e inGSM?@6!

ch */? 3/@* 7*/0 Ch8

&ow many AR9CN $o you ha2e inGSM*H66!

Ch @*/ 3 ?** 7F66 ch8

Which is the num#er of frames in aSIGNA''ING C&ANNE'!

@*

Which is the num#er of frames in aTRA99IC C&ANNE'!

/

What


5/21

What is 4iffraction!

When the R9 si,nal is $istorte$ aroun$ an o#>ect)&a++ens to all EM wa2es" it seems as thou,h the wa2e

#en$s aroun$ an o#>ect" therefore can +ro2i$e co2era,e#ehin$ an o#struction) &a++ens when there is no 'OS orthe *st 9resnel =one is o#structe$) Commonly mo$elle$as nife e$,e" either sin,le or $ou#le) E+stein3-etersein

is a multi+le e$,e mo$el)

What is the effect of transmitfre(uency on 4iffraction!

None) 4iffraction is in$e+en$ent of fre(uency

What is the $ifference #etweenSer2ice an$ Co2era,e!

Co2era,e is +ro2i$e$ #y the si,nal +ro+a,atin, to anarea) Ser2ice is usea#le co2era,e" affecte$ #y

interference or GSM $istance constraints

What is the relationshi+ #etweenCo2era,e an$ Interference!

Interference is unwante$ co2era,e) The same si,nal can#e #oth co2era,e or interference $e+en$in, on whether

the si,nal is useful or not

What is the re(uire$ informationfrom site sur2ey acti2ities! An$ what

are their +ur+ose!

Site location 7'at" lon,8" Antenna confi,uration 7$i2ersity"&-%W" ,ain" ty+e8" Antenna line information 7fee$erlen,th.loss" s+iltter" $i+le;er" M&A8" Roofto+ layout)

This is use$ for lin #u$,e calc)" co2era,e +lannin, an$+re$iction simulation" o+timi=ation analysis

Customer wants to ,i2e to 33333 anew ser2ice" co2era,e +lannin, of a

new maret) ou nee$ to tell himwhich are the in+uts you nee$ in

or$er to start your wor) -lease $oso 1 which are the in+uts you nee$

to as him for)

Co2era,e -oly,ons 7Rural" Su#Ur#an" Ur#an" 9reeway8 4ifferent R;'e2el for each +oly,on Co2era,e -ro#a#ility

What is the Co2era,e -ro#a#ility!ou ha2e normally / Co2era,e-ro#a#illity 1 which are their

names!

Cell E$,e) Cell Area)

Which is a ty+ical Co2er,e-ro#a#ility you can use for co2era,e

$imensionin, +ur+oses!

Cell Area Co2era,e -ro#a#ility D H6 is a ty+ical 2alueyou can use an$ that you ha2e to +ut in the -ro+a,ationmo$el as an in+ut in or$er to ha2e the Cell Ran,e an$

from that the Cell Area)

The customer has ,i2en you thein+ut you ha2e re(ueste$ him7-oly,ons" R;'e2" Co2era,e

-ro#a#ility8 now you nee$ to $eci$ewhich are the tools you nee$ in or$erto ,i2e him an initial un$erstan$in,

of how many sites he nee$s) -leasetell me which are the tools you nee$

*) ou nee$ to $eci$e the ty+e of e(ui+ment an$confi,uration you want to ha2e) Normally this is a

stan$ar$ one 7e),) U'TRASITE" w. 'NA" / TRs8 /)Calculate the 'IN: %A'ANCE for that s+ecific

confi,uration) F) -ro+a,ation Mo$el 7e),) Oomura &ata8correction factors 7e),) mean an$ stan$ar$$e2iation8

-ro#a#ly at this +oint you ha2e to$eci$e . as which is the ty+ical

confi,uration you want in the sites7omni" / sectors" F sectors8) Whichare the a$2anta,es . $isa$2anta,es

of OMNI!

-RO OMNI 5 Trunin, Gain) Co2er +erfectly an Islan$ fore;am+le" from the to+ of a hill) CONS OMNI 5 -ainfulwhen you nee$ to mae fre(uency +lan an$.or limit

interference


6/21



of / sectors!

-ro#a#ly you can use a / sector site when you ha2e afreeway in a rural area)



of F sectors!

F sectors is +ro#a#ly the #est com#ination for co2era,ean$ fre(uency +lan an$ it ,i2es ,oo$ a#ility to control

interference 7w. tilts8

Relate$ to the +re2ious (uestion 1which is the #est confi,uration is youha2e to co2er a freeway! An$ if younee$ to co2er an Islan$! An$ if you

nee$ to co2er a city!

City 5 F sectors) 9reeway 5 / sectors 7#ut only if aroun$there is really nothin, else to co2er8) Islan$ 5 Omni wors

>ust fine if you +ut it on the to+ of the hill

Once you ha2e $eci$e$ which is thesector confi,uration to use" how canyou use the Cell Ran,e calculate$

w. the -ro+a,ation Mo$el correctionfactors in or$er to calculate how

many sites to you nee$!

ou use the ty+ical he;a,on mo$el) With that you nowhow many sites you nee$ in or$er to co2er you +oly,on)

What is the relationshi+ of W" $% an$$%m!

*6Plo, 7W8 5 $%W"*6Plo,7W.*666mW8 5 $%m"

*6 lo, 7-ower. Reference8 5 $% or /6 lo, 7Bolta,e .Reference8

*6 $% J *0 $% /0 $%

*6 $%m J *0 $% /0 $%m

*6 $%m J *0 $%mIn or$er to $o it you nee$ to con2ert the $%m to Watt" sumthe Watts an$ ,o #ac to $%m 1 in this case the results

is *@)0@@ $%m

Is the followin, statement correct!Oumura &ata mo$el use$ in

GSM?@6 is the same as GSM*H66)

9alse) The A an$ % coefficient use$ in O& mo$el is$ifferent if fre(uency #elow *666 M&= an$

a#o2e*@66M&=) %esi$es" the area correction factor is$ifferent #etween the / fre(uency

What is the +ossi#le way to im+ro2elin #u$,et!

%TS ty+e 7R; sensiti2ity an$ T; -ower8" Antenna ,ain"fee$er len,th an$ ty+es 7site +lannin,8" usin, M&A an$

$i2ersity 7im+ro2e R;8" usin, %ooster 7im+ro2e T;8

Sensiti2ity an$ TR out+ut +ower for

33333 METROSITE! 3**/ to 3**@ $%m" @W TR

Sensiti2ity an$ TR out+ut +ower for33333 U'TRASITE!

3**@ ty+ical 73**/ to 3**? $%m8"0F$%m 7,uarantee$ D minimum on *66 +ro$uction8

0$%m TR 7nominal D on H6 of +ro$uction8


7/21

&ow $oes the lin #u$,et im+act tonum#er of the sites re(uire$ in an

area!

With the ma;imum allow +athloss from lin #u$,et withconsi$eration of '-" ST4" Slow fa$in, mar,in an$

+ro+a,ation mo$el " it is use$ for $efinin, the cell ran,e) Ifthe +athloss is #i,,er" the cell ran,e coul$ #e hi,her an$

the num#er of sites re(uire will #e re$uce$)

-lease list F metho$s of ca+acityenhancement an$ their +ros L cons

cell.site s+littin, co2era,e enhancement #ut more cost tohar$ware L limitation of fre(uencymore TR easy #ut nee$ fre(uency

micro cell layer more easy to control interference #utmore site re(uire

$ual#an$ a$$itional s+ectrum re(uire$" minimi=e im+actto e;istin, #an$ co2era,e.ca+acity"

soft ca+acity features ho++in," IUO" 49CA" AMR" 4T#etter cell +lannin, Lo+timi=ation for #etter interference

control)

&ow $oes 'NA im+ro2e thesensiti2ity!

%asically the 'NA is hel+in, to im+ro2e the effecti2e noisefi,ure of the recei2in, +ath which then re$uces the R;

Sensiti2ity of recei2in, +ath) The sim+le way to $o is the

com+ensation of fee$er loss 7#ut not more than 'NA,ain8) &owe2er" the calculation ha2e to #e calculate$ on

the effecti2e noise fi,ure an$ effecti2e ,ain of therecei2in, +ath)

INTE''IGENT 4OWN'IN:4IBERSIT!

I44 is #asically a 4' #ooster) The way it wors is#asically +uttin, to,ether the si,nals of / TRs with thesame si,nal #ut w. a $ifferent +hase) The ,ain is D F $%)

What is the +ro#lems with hi,hrise#uil$in,s!

lac of co2era,e as the antennas are lower $own)Increase$ interference from 'OS to many sites)

What is trunin, ,ain!

TRUN:ING GAIN IS T&E GAIN T&AT OU &ABE W&ENOU &ABE 'ESS ENTR -OINT TO T&E RESOURCES

7e),) * line in front of the *6 air+ort chec3in counters

wors much #etter than *6 lines in front of the same *6air+ort chec3in counters8 1

what $oes * Erlan, mean!One channel use$ for F66 secon$s in * h D *66

utili=ation of a resource 7TC& or -4C& in GSM8

Customer is com+lainin, that w.*TR he can ser2e only F Erlan,

an$ has *6 #locin, while we ha2etol$ him that accor$in, to the Erlan,% ta#le we shoul$ #e a#le to ser2e F

Erl w. / #locin,) What isha++enin,!

%asically the traffic is not a++roachin, the %TS w. a-oisson $istri#ution 7which is the assum+tion that is the

#ase of the Erlan, % mo$el8

What is the Erlan, C ta#le! It is a mo$el which taes into account (ueuin,

If we ha2e QUEUING acti2e $o wenee$ to use the Erlan, C ta#le!

Why!No 1 #ecause (ueue is not infinite 1

Is the Erlan, % ta#le the ri,ht mo$elto use in case of AMR 9R . &R!

NO

* TR w. / #locin, 1 accor$in,to the Erlan, % ta#le how many

Erlan, can I ser2e!D F Erl


8/21

What is the out+ut from lin #u$,et! Ma;imum allowe$ +athloss 7U' an$ 4'8

Which is a ty+ical -ath'oss you canha2e in a GSM connection!

D *@6 $%

4o we use $ifferent 'IN: %U4GETfor $ifferent ty+e of en2ironments!

No" ma;imum allowe$ +ath loss is not en2ironment$e+en$ent) It is ser2ice $e+en$ent thou,h

What is the +ur+ose of a ra$io+lannin, tool!

To mo$el the networ) Allows the +lanner to see the effectof main, chan,es to the networ so the #est solution can

#e chosen an$ im+lemente$) Can also #e use$ to storeall the site $ata)

&ow can you ensure the +lannin,tool is as accurate as +ossi#le!

9irst start with accurate clutter" 4TM an$ #uil$in, $ata)Ne;t cali#rate the mo$el correctly) All site $ata must #e

correct) This will ,i2e the +ro+a,ation mo$el of thenetwor)

What ,eneral +ower law $o+ro+a,ation mo$els follow!

F)@ +ower law 70th +ower law ,oo$ enou,h8

Name two metho$s of +ro+a,ationmo$ellin,

Statistical an$ 4eterministic 7Ray tracin," 2irtual source8

Name two statistical mo$elscommonly use$

Oumra3&ata 7General +ro+a,ation8 an$ Walfisch3Ie,ami 7canyon lie en2ironment8

&ow $o you cali#rate a statistical+ro+a,ation mo$el!

Collect CW 7not TEMS" noise floor isn


9/21

What is the GSM re>ection ratio forco3channel interference!

H $%

What is a$>acent channelinterference!

When a cell is #ein, interfere$ with #y another cell with acarrier fre(uency which is se+erate$ #y /66&= for the

*st a$>acent interferer" 066&= for the /n$ a$>acentinterferer" etc)

What is the GSM re>ection ratio forthe first a$>acent channel

interference!3H $% 73*? $% for the secon$ a$>acent interferer8

What is fre(uency reuse 0.*/ ! There are */ fre(uency ch reuse on the 0;F3sector sites)

When +lannin, a fre(uency what isthe channel se+aration re(uire$ for

the TR in the same cell!

F ch) 766 &=8 for GSM?@6 an$ 0 ch 7?66 &=8 forGSM*H66

When +lannin, a fre(uency what isthe channel se+aration re(uire$ for

the TR in the same site!066 &=

what is the $ifferent #etweenho++in, scheme *.*" F.F" *.F!

*.* there is * MA list an$ reuse on e2ery cellsF.F there are F MA list an$ each site 7F sectors8 usin,

same MA list an$ reuse e2ery F sites*.F there are F MA list an$ each cells in same site usin,$ifferent MA list) An$ reuse same +attern for e2ery site)

What is the factor to $eterminewhich ho++in, scheme a#o2e to #e

use$!

Num#er of TR 7too small num#er of TR cannot ,ainmuch from %% ho++in,8 an$ com#iner ty+e) 7RTC is only

can use %% ho++in,8

4o we nee$ to +lan MAIO Ste+" MA'ist" MAIO Offset an$ &SN when

use %% ho++in,!

There is no nee$ to +lan for MAIO an$ MAIO offset in %%ho++in,) &owe2er" &SN is re(uire$)

4o we nee$ to +lan MAIO Ste+" MA'ist" MAIO Offset an$ &SN when

use R9 ho++in,!

yes" all of them) MA list is re(uire$ to +lan to ensure thatthere is no fre(uency collision within the site) &SN shoul$

#e same for all sectors in the sites)

4o you ha2e MA' only w. R9ho++in, or also w. %% ho++in,!

only with R9 ho++in,

Which is the main $ifference#etween R9 an$ %% ho++in,!

R9 5 TR chan,es AR9CN) %% 5 Call mo2es from *RTS' to an other 7in an other TR8

What is a MA'! Mo#ile Alloction 'ist) It is use$ for R9 &O--ING

&ow many MA' can you $efine in a33333 %SC!

*/?

Which are the +arameters you nee$t $efine in the %TS when you want to

use a MA'!&SN" Maio Ste+" MAIO Offset"ho++in, mo$e" MAlist

Why $o we use 9re(uency &o++in,!7I mean which are the a$2anta,es of

fre(uency ho++in,8

ou ha2e / a$2anta,es w.fre(uency ho++in, 19REQUENC 4IBERSIT 79A4ING8 an$

INTER9ERENCE 4IBERSIT

Which is the ty+e of fa$in, you area#le to #eat when you use

&O--ING!9ast 9a$in,


10/21

ou ha2e a %TS w. F ho++in, TRsan$ a MA' w. F AR9CN 1 once you

try to unloc the the site the %SC,a2es you a 4 error sayin, that

you $on


11/21

Which is a +arameter you canchan,e in or$er to re$uce the

+ro#a#ility that a MS that went out ofco2era,e will #e +a,e$!

-erio$ic 'ocation U+$ate 1 you nee$ to re$uce it 1

Why $o we nee$ %SIC in GSM!I$entify nei,h#our 1 cou+le %CC&" %SIC mae you

i$entify the nei,h#our

&ow many #its are the %SIC!

Which are the / com+onents of the%SIC!

NCC" %CC

Which is the relation #etween %CCan$ TSC!

They shoul$ #e the same in the %CC& TR" not in all theTRs 1 NO:IA #y $efault is usi, the same #ut it is not

man$atory in GSM)

Can we ha2e TSC %CC in 33333!Since when! 4o you now ifCINGU'AR has it acti2ate$!

7$o we ha2e any features that coul$allow TSC %CC!8

es" we ha2e a S*6 feature a#out it) CINGU'AR $oesn


12/21

What is the -'MN +ermitte$+arameter!

It $efines to which -'MNs the MS is +ermitte$ to re+ortmeasurement results)

Is -'MN +ermitte$ +arameter thesame as -'MN i$!

No)

What +arameters nee$ to #e set asthe e(ual to or su#set of -'MN

+ermitte$!

NCC +art of the %SICs)

If it is not set" what will ha++en! MS is not +ossi#le to measure the cells e),) no &O)

Where really $o you nee$ this+arameter!

National %or$ers

4o you now which is the -'MNsettin, use$ in CINGU'AR!

All of them

Can you use TRA99ICA tool in theCINGU'AR networ! %lue!

Oran,e! Why!Only if you ha2e our core 1 means Oran,e

If you increase the 'A si=e $o youe;+ect an increase in the A I.f traffic!

NO

If you increase the 'A si=e $o youe;+ect an increase in the A#is I.f

traffic!ES

If you increase the 'A si=e $o youe;+ect an increase in the Air I.f

traffic!ES

What $o you use the 9ACC& for inU' an$ 4'!

&O" CA'' SETU- if you ha2e the feature

What $o you use the SACC& for inU' an$ 4'!

System Info 74'8" Measurements 7U'8" SMS $urin, a call

&ow many S4CC& can you +ut in *RTS'!

?

Which is the $ifference #etweenCOM%INE4 an$ SE-ARATE4

si,nallin,!

com#ine$ 5 CCC& J 0S4CC&V se+arate$ 5 CCC& an$S4CC& are in $ifferent RTS'

Which channels ha2e no +owercontrol!

%CC&" S4CC&" G-RS TS'74'8

Measurement re+ort is sent to %SCe2ery +erio$ of which channel an$

how lon, $oes it e(ui2alent to!SACC& 5 0?6 ms

What is the $ifferent #etween syncan$ non3sync &O! An$ in whichcase it will ha++en! An$ what

+arameter is use$ to $efine this!

in non3sync &O" there is +hysical information is re(uire forMS to +erform &O) The information contains TA

information an$ it re(uires when the cell &O to $ifferent%C9 cell) The +arameter is in each A4 +air SNC

is followin, statement correct!There is no +ro#lem if the nei,h#orlist contains the same %CC& an$same %SIC from $ifferent cells as

lon, as the / nei,h#our are far awayan$ not interfere to each other)

9alse) MS re+ort only %CC& an$ %SIC to %SC" therefore%SC will not #e a#le to $ifferentiate which A4 is the ri,htone an$ that coul$ cause &O failure an$ e2entually call

$ro+


13/21

What is the N;.-; +arameters inhan$o2er +arameters $efine$! An$what is the im+act on settin, lar,e

num#er of N;.-;!

N; is the total num#er of sam+le in the e2aluation)-; is the num#er of sam+les within N; that #elow or

a#o2e threshol$)The lar,e num#er coul$ lea$ to the lon,er time for &O

$ecision main,

Whatacent Cell -riorityF8 O2erloa$e$ Cell 3 Re$uction of -riority

08 R le2el 7if same +riority8

What is ty+ical 2alue use for -%GT

&O mar,in! $%

What are the F +arameters in %SSthat nee$ to chan,e to mae sure

that $ual#an$ is worin,!

$ual%an$Cell in$icates cell as $ual #an$ cellmultiCell%an$Re+ortin, 6))F num#er of a$>acent $ual#an$ cells taen into account for measurement re+ort

earlySen$in,In$ication ena#les MS to sen$ classmarF messa,e as early as +ossi#le

What is the im+act of settin, hi,hernum#er of mulitcell%an$re+ortin,!

it re$uces the amount of same #an$ re+ortin,) Normallythere are only cells re+ort from MS) 4e$uctin, #y M%R"

the rest will #e use$ for same #an$)

What feature coul$ #e use$ to hel+the situation!

EMR

What is the R'T +arameter! R'T 5 Ra$io 'in timeout)

&ow $oes R'T wors!

It is #oth in U' an$ in 4') S+eain, a#out U' 1 if the%TS $oesn


14/21

Why shoul$ we ha2e $ifferent R'Tfor AMR 9R an$ AMR &R an$ E9R!

%ecause the C.I +rotection in 2ery $ifferent 1 so the R'Tshoul$ tae into account #efore $ro++in, a call 1

What $oes E9R mean! E9R 5 Enhance$ 9ull Rate

What is 9AST ABERAGING!It is a way to s+ee$ u+ the -ower Control J &O $ecisions

#ecause you $on


15/21

What is AMR! A$a+ti2e Multirate 2oice co$in,

&ow $oes it wor!AMR 2aries the +ro+ortion of 2oice co$in, an$ channel

co$in, to +ro2i$e more ro#ustness in #a$ C.I at thee;+ense of 2oice (uality

&ow many AMR co$ecs are there at

9R an$ &R!

? at 9R" at &R 7* not use$ in &R8) Only 0 can #e use$

in a call

What is MOS!Mean O+inion Score A su#>ecti2e 2iew of the (uality of a

2oice call

What is 9ER!

9rame Erasure Rate Num#er of s+eech frames $iscar$e$$ue to errors) A #etter measure of (uality than %ER withAMR #ecause %ER is measure$ #efore $eco$in, an$

9ER after $eco$in,

What is the effect of AMR on a fullrate channel!

It allows the call to maintain the same 9ER in worse C.Icon$itions

What is the effect of AMR on a halfrate Channel!

It allows the 9ER to im+ro2e in #etter C.I con$itions whileoccu+yin, half a timeslot

&ow $oes AMR lin a$a+tationwor!

When certain C.I threshol$s are met" the 2oice co$ec will

#e chan,e$) There is no tar,et 9ER to maintain an$threshol$s ha2e to #e carefully chosen

What is a half rate channel!A channel with **)0 #+s) 9R is //)? #+s) Each channel

occu+ies alternate #ursts of a multiframe)

&ow $oes the %SC $eci$e whetherto use a &R or 9R channel!

With cell loa$ threshol$s) When the lower limit is reache$"calls are +ace$" when the u++er limit is reache$" new

calls are sent to 9R

When is a &R un+ace$ to 9R! When the R;Qual of the &R call reaches a +re3set limit

4oes 33333 su++orts all the GSM AMRco$ecs!

No $oesn


16/21

What are the 49CA &Wre(uirement!

3%SC/i J C-/M C-U car$s or %SC Fi3%SC3%SC connections for %SC usin, 49CA an$ ha2e

a$>acent ser2ice area)3Ultrasite or metrosite %TS

3 Wi$e#an$ com#iner3 'MU in e2ery %TS

What are the 49CA SWre(uirement!

3S**)@3 C0)*3OSS0

3'MU0)*

Three fre(uency #an$s are $efine$in 49CA" what are they!

%CC& #an$" Re,ular #an$ 7o+tional8" 49CA #an$

What are the re(uirement.limitationin 49CA #an$!

3The ran,e of Malist is *3F/3The 49CA MA list must #e $efine$ the same way in al

%SCs within each continous %SC area349CA MA list $o not contain consecuti2e fre(uency

3Any two 49CA MA lists containin, a$>acent fre(uencyare re(uire$ to #e of the same len,th)

What are the in+uts for 49CAchannel allocation!

3non real time information I)e) %ac,roun$ inteferencematri;

3near real time information I)e) Mo#ile measurementre+ort

3 realtime information I)e) Ra$io channel usa,einformation

What are the 0 metho$s in 49CA C.Iestimation!

incomin, 4'" Incomin, U'" Out,oin, 4'" Out,oin, U'

What is the Soft %locin, in 49CA!

Soft %locin, is a user $efine +arameter)

If in the C.I estimation +hase any of the four C.I estimates+ro$uce$ for each ra$io channel can$i$ate $oes not

e;cee$ the soft #locin, limit of the interfere$ connection"then the ra$io channel can$i$ate is $eeme$ soft #loce$)

If there are no acce+ta#le assi,nment can$i$ates 7i)e) allthe can$i$ates #reach the connection ty+e s+ecific soft#locin, C.I limit8" the assi,nment will #e $irecte$ to a

re,ular TR if a2aila#le)

If there are no free TS's on any re,ular TRs of the cell"the call will #e finally re>ecte$ 749CA soft #locin,situation8) 4irecte$ retry coul$ still #e use$ an$ if

successfull the $irecte$ retry will mo2e the call to anothercell in which case the call is not re>ecte$)

In case of han$o2ers soft #locin, is not a++lie$ e;ce+t ifthe han$o2er is for 4R or 4A4'% then the soft #locin, is

a++lie$ as in normal call setu+)


17/21

What is 49CA force$ &R mo$e!

If the current incomin, 4' C.I a2era,e is #elow the 9orce&R mo$e C.I threshol$ for the corres+on$in, channel

ty+e 7non3AMR.AMR8" then the force &O mo$e isswitche$ on) After &R mo$e switche$ on" &R

channel.AMR &R channel will #e assi,ne$ to a s+eechconnection that is +lace$ on a 49CA TR until the &R

mo$e switche$ off)

49CA 9orce &R mo$e C.I threshol$ an$ 9orce &R C.Ithreshol$ AMR are user $efine$ +arameters)

What is the restrictions to use49CA! 7features interworin,

limitation8

X -acet switch territory is not allow in 49CA TRX 4ynamic S4CC& is not allowe$ in 49CA TR

X 9ACC& call setu+ to 49CA TR is not +ossi#le)X Antenna ho++in, cannot #e use$ in 49CA TR

A+art from 49CA +arameter" whatare the +arameters shall #e chece$

for 49CA acti2ation!

%SS Synchroni=ation3Sync MUST #e on +rior to switchin, to 49CA Mo$e)

39N an$ TS offsets shoul$ #e set 7not left at 68Interference &an$o2ers

3nterference #ase$ han$o2ers shoul$ #e ena#le$ on all49CA %TS

4ynamic -ower Control3Shoul$ #e ena#le$ on all 49CA %TS for U' an$ 4'

Timeslot Ty+e3TC& timeslots only su++orte$ on 49CA TRYs

3All si,nalin, 7e),) S4CC&8 an$ G- timeslots must #eremo2e$)

I$le L Acti2e %A 'ist Usa,e3%A list must #e create$ an$ attache$ for I$le L Acti2e use

in each 49CA %TS

What a$$itional networ elements

are nee$e$ for 4ata! SGSN" GGSN" CG" 4NS" 7%G" 'IG8

What elements nee$ to #e u+,ra$e$to acti2ate EG-RS!

TRs) A mo$ulation scheme is use$ an$ mo$ulation is+erforme$ #y the TR with har$ware

&ow $oes an MS han$o2er from onecell to another $urin, a $ata

session!

It $oesn


18/21

What is the ma;imum #itrate +ertimeslot with G-RS an$ EG-RS!

G-RS *F#+s with CS/" EG-RS @H)/ #+s with MCSH

What is timeslot ca+acity!Ma;imum TS' ca+acity after C.I has re$uce$ the MCS

#ut #efore T%9 multi+le;in,

What are the MCS families use$ for!Re3transmissions are sent in MCSs of the same family as

each family has a $ifferent +acet len,th)

What functionality counters fastfa$in, in EG-RS!

Incremental Re$un$ency

&ow $oes it wor!

4ata is +uncture$ after co$in,) This in2ol2es re$ucin, thenum#er of #its nee$e$ to sen$ the $ata) F +uncturin,

co$es are use$) If the first +acet can


19/21

What is the $ifference #etween one3+hase an$ two3+hase access!

In one +hase" the RAC& re(uest ass for a T%9) In two+hase" the RAC& re(uest as for a sin,le #loc an$ uses

this to as for the T%9)

What is a RA!Routin, Area ser2e the same function for $ata as the 'A

for 2oice Allows the SGSN to +a,e the MS

What is its relationshi+ to an 'A!

A RA is a su#set of an 'A) Ma;iumum si=e is the 'A si=e)

An 'A can ha2e more than one RA)

Which is the tra$e off in the4E9AU'T TERRITOR si=e!

Small $efault territory 5 9ew G-RS reason &o) %i, $efaultterritory 5 %etter Throu,h+ut

Can you ha2e se+arate$ 7from theBOICE one8 si,nallin, for G-RS .

EG-RS!es" you can althou,h it is not really use$

Which is the channel you are ,oin,to use!

-%CC&

Which is the tra$e off in term ofsi,nallin, usin, -%CC&!

Nee$ to use a $e$icate$ RTS' for it

What


20/21

Outline a $imensionin, metho$ forcom#ine$ 2oice an$ $ata traffic!

Erlan, % will +ro2i$e enou,h s+are TS' to ,uarentee GoSfor 2oice) 4ata can use these) 9ormula is a choice

#etween Erlan, % an$ an a++ro;imation" which e2erre(uires more timeslots) Num#er of TS' for $ata is $ata

loa$ $i2i$e$ #y TS' ca+acity) Total TS' re(uire$ ,i2en #yMa;7Erlan,%7CS8"CS traffic7E8JGuar$ TS'JTS' for $ata3

4e$icate$ TS'8J$e$icate$ TS') 9rom here wor outTRs an$ so on)

What is rate re$uction!A way of inclu$in, timeslot multi+le;in, in $imensionin,#y tain, into account CS an$ -S traffic an$ -S territory

&ow #i, can an E4A- #e! */ P 0 #+s A#is TS'

&ow many E4A-s can #e attache$to a site!

There is no limit) It coul$ #e one +er site or one +er TR"althou,h this is inefficient

&ow many E4A-S can #e ma++e$onto a sin,le T*! As lon, as there is s+ace on the T*" there is no limit

Which are the F states of a MS inG-RS!

Rea$y" I$le" Stan$#y

What $oes REA4 mean!MS is transmittin, $ata or it has >ust transmitte$ $ata 1 it

is in acti2e mo$e

What $oes I4'E mean! %asically the SGSN $oesnust AC:

What is the effect of +uttin, $ata ona ho++in, TR!

With no +ower control there is increase interference to theho++in, layer

What is the main o#>ecti2e ofEG-RS o+timisation!

To ma;imise user throu,h+ut

In EG-RS" how is this achie2e$!Mostly throu,h" ca+acity im+ro2ements) C.I im+ro2ementswill affect the MCS #ut this is line$ to GSM) 9or EGR-Sonly we can +lay with TRs" 4e$ TS'" E4A-" -CU" G#


21/21

If a TR is %':3SS when EGENAis turne$ on" what is the most

+ro#a#ly cause!GTR5 an$ the TR is not attache$ to the E4A-

Name some EG-RS :-Is

Throu,h+ut" T%9 est fail" T%9 fail" T%9 lost $ue to flush orMS lost" GMS: share of EG-RS" T%9.TS'" -ayloa$"

E4A- con,estion 7mins.G#8" territory u+,ra$e re>ects"territory $own,ra$es" -CU con,estion

What is -oC! -ush3to3Tal o2er Cellular) It is a real3time ser2ice

What elements nee$ to #e a$$e$ for-oC!

-oC Ser2er" +ossi#le -resence ser2er

&ow is EG-RS use$ for -oC!It is merely a trans+ort layer" -oC is a ser2ice that uses

EG-RS

Are there re3transmission in -oC! Not from the -oC ser2er) EG-RS uses normal al,orithm

What :-Is are use$ in -oC!Start to Tal 7STT8 time" Boice Throu,h 4elay

7BT48"Glitches 7$elay in +acet arri2al8" 'ost $ata8" Roun$Tri+ 4elay 7RTT8 7$e+en$s on user reaction8

What 2alues are normally e;+ecte$

for STT an$ BT4! STT /s" BT4 0s

What is thea$2anta,es.$isa$2anta,es of a low

initial MCS

A$2 ,reater +ossi#ility of the $ata #ein, $eco$e$ for MSsin #a$ (uality) 4is 'ess ran,e if ?-S: $ue to +ower #ac3

off

4efine a MicrocellA small ca+acity cell with an antenna not more than @m in

hei,ht

What is the #est +osition for amicrocell antenna!

In a ,ri$ system" on the si$e of a #uil$in,) Not on a cornerotherwise the canyon streets will +ro+a,ate the si,nal too

far) In a non ,ir$ system" si$e or corner of the #uil$in,where2er #est ser2es the tar,et area)

What are the $isa$2anta,es of a

micro cell!

9ast mo2in, mo#iles may select it an$ then lea2e theco2era,e area 2ery fast) 'ocal con,estion #ecause of

hi,h traffic

&ow can these #e sol2e$!Use C/ +enalty time to mae the cell attracti2e only to

slow mo#iles) Run the cell as #arre$ an$ use hierarchicalhan$o2ers to mo2e the calls from the o2erlayin, macros

Name some R9 systems use$ in in3#uil$in, cells

Acti2e or +assi2e 4istri#ute$ Antenna Systems 74AS8"leay fee$ers" a,is in the lift shaft)

If you $on

BEST-GSM-Q-A

Documents