Tems Gsm Parameters

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TEMS GSM PARAMETERS

On completion of the module one should be clear about the

parameters required during drive test what does it means and

how important they are.

Parameters regarding in windows like:

Current Channel

Radio Parameters

Serving !eighbors

"#PRS $ine Chart

#S% &ata 'imeslots

GSM CURRENT CHANNEL

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• Time: (t is system time of computer in te)t format:**:%%:SS.mm+ where mm , decimal seconds.

• Cell name: (t displays the name of the sector which is

serving according to the cell-le that is loaded in '"%S.

•

CGI : (t stands for the Cell #lobal (dentity which is unique forevery sector of the site. (t consists of %CC+ %!C+ $/C+ C(.

%CC: %obile Country Code 0 1 222 3e.g. 456 in !igeria7+

%!C: %obile !etwork Code 0 1 22 3e.g. 80 for #lobacom in

!igeria7 $/C : $ocation /rea Code 0 -48898 3e.g. 9009 in

Rivers State7 C(: Cell (dentity 0 1 48898 3e.g. 62;;7

• Cell GPRS Support: 'ells sector is having #PRS or not.

<alues are =es or !o.

• Band: (t tells in which >req. ?and mobile is operating e.g.

#S% 200@ 6A00.

• BCCH ARCN: (t tells by which ?CC* is the mobile station

getting served.

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• TCH ARCN: On which 'raBc >req. call is going on.

• BSIC "Ba#e Station Identit$ Code%: (t is combination of

!etwork Color Code 3!CC7 30 - ;7 ?ase Station Color Code

3?CC7 30 1 ;7. e.g. ;0. (t is decoded by mobile on everySynchroniDation Channel %essage.

• Mode: (t is shows in which state is mobile operating+ !o

Service+ (dle+ &edicated+ $imited Service+ Scan+ Packet

Packet (dle modes.

• Time #lot: On which time slot of current 'C* call is going

on. <iD. time slot no. of 'RE.

•

C&annel T$pe: 'ype of channel mobile is getting now. $ike?CC* @ S&CC*@A S/CC*@CA or C?C* @ 'C*@>>/CC*@>

S/CC*@>.

• C&annel Mode: Shows mode of coding like Speech >ull Rate

of *alf Rate.

• Spee'& Code': (t shows >R for >ull Rate+ *R for *alf Rate

">R for "nhanced >ull Rate.

•

Cip&ering Algorit&m: (t shows ciphering algorithm used bythe system to protect data for privacy. ".g. Cipher by /8@5.

• Su( C&annel Num(er: (t is displayed at a time when

mobile is on dedicated mode at time of call setup when it is

getting S&CC* at that time it shows which S&CC* it is

getting out of A available. ".g. 0.

• Hopping C&annel: (t shows that current sector is having

hopping feature or not. <alues are either =es or !o.• Hopping re)uen'ie#: (t displays no. of freq. on which

mobile is allowed to hop. viD. %/ $ist for hopping of that

sector.

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• Mo(ile Allo'ation Inde+ ,-#et "MAI,%: (t is the number

which tells from which freq. from given %/ list for sector

hopping has to be started. ".g. 0 means sector will start from

rst freq. to hop up to 49.• Hopping Se)uen'e Num(er "HSN%: (ndicates sequence in

which frequencies are allowed to hop from the %/ $ist. 0 -

49. 0 for Cyclic *opping+ 6 1 49 random hopping sequences.

GSM RA.I, PARAMETERS

• R+Le/: Receiving level in terms of d?m that mobile is

receiving from the site. Subtracting 660 from the seen R)$ev

value on '"%S to get the d?m value. Range of -90 d?m to-660d?m.

• R+0ual: Fuality of voice which is measured on basis of ?"R.

Range of R)Fual 0 -;.

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• ER: >rame "rasure Rate it represents the percentage of

frames being dropped due to high number of non-corrected

bit errors in the frame. (t is indication of voice quality in

network.• BER A'tual: Ratio of the number of bit errors to the total

number of bitstransmitted in a given time interval. ?"R is a measure for the

voice quality in network. &epending on ?"R R)Fual is

measured. "+g+ ?"R 0 to 0.5 Gcorresponds to R)Fual 0. %a). ?"R countable and useful is

up to 65.A G which corresponds to R)Fual of ma). ;.• S0I: SF( is a more sophisticated measure which is dedicated

to reHecting the quality of the speech 3as opposed to radio

environment conditions7. 'his means that when optimiDing

the speech quality in your network+ SF( is the best criterion

to use. SF( is updated at 0.8 s intervals. (t is computed on

basis of ?"R and >"R. >or ">R 90+ >R 1 56 *R 1 6; are

respectively ideal values.

• C2I: 'he carrier-over-interference ratio is the ratio between

the signal strength of the current serving cell and the signal

strength of undesired 3interfering7 signal components. (t

should be at least I 2.

• MS Po3er Control Le/el: Phone transmit power ordered by

the base station+ (t displays range of power control from 0 to

96 depending upon network design. ".g. 0 means no power

control and 6 means level that is dened by operator.

• .T4: &iscontinuous transmission 3&'E7 is a mechanism

allowing the radio

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transmitter to be switched oJ during speech pauses. 'his

feature reduces the power consumption of the transmitter+

which is important for %Ss+ and decreases the overall

interference level on the radio channels aJecting the

capacity of the network.

• TA: <alue that the base station calculates from access bursts

and sends to the mobile station 3%S7 enabling the %S to

advance the timing of its transmissions to the ?S so as to

compensate for propagation delay. <alue of 0 means %S in

radius of 880mt from ?S.

• RL Timeout Counter "Cur%: 'his parameter denes the

ma)imum value of the value of the radio link counter

e)pressed in S/CC* blocks. Range of 1 4 in step siDe of .

(t shows current value of R$'. &ecrease by 6 but increase by

5. Khen it reaches Dero it results in normal &ROP call.

• RL Timeout Counter "Ma+%: 'his parameter denes the

ma)imum value of the value of the radio link countere)pressed in S/CC* blocks. Range of 1 4 in step siDe of .

(t shows current value of R$'. !ormally 64+ 50+ 5.

• MS Be&a/ior Modi6ed: (ndicates whether the phoneLs

behavior has been changed from the default. %ost of what

follows is applicable only to Sony "ricsson #S% phones."mpty string: !o modication of phone behavior?: %odication of behavior not related to channel selection

3the information elements /dMacent Scan+ ?and Control+

>orced Power Class+ (dle Channel Fuality7C: %odication of channel selection behavior 3the

information elements &isable *andover+ (gnore Cell ?arred+

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Prevent *andover $ist /ctive+ Prevent Serving Cell $ist+

Serving Cell $ist /ctive+ 'arget *andover7#: %odication of #PRS behavior 3the information elements

>orced #PRS Class+ >orced %ulti-slot Class+ >orced Fuality of Service7./ny combination of these letters may appear.

GSM SER8ING 9 NEIGHB,RS

• Cell Name: !ame that describes the neighboring cell as per

the cell-le.

• ARCN: Channel number mobile receives as neighbor.

• BSIC: ?S(C of the neighboring cell.

• R+Le/: Receiving $evel in d?m of neighboring cell.

• C1 C!: 'hese are the cell path loss criterion and cell

reselection criteria. <alid during idle mode of mobile station.

•

C*1 C*!: #PRS signal strength threshold criterion C96and #PRS cell ranking criterion C95. <alid both in packet idle

and packet dedicated mode.

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EGPRS LINE CHART

• Su(<Net3or= .ependent Con/ergen'e Proto'ol

"SN.CP% T&roug&put .L ">(it2#%: &ata throughput

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3including protocol headers+ but e)cluding retransmissions7

on downlink at S!&CP protocol level. 'he range is 0 1 00

kbit@s

•

LLC T&roug&put .L ">(it2#%: &ata throughput 3includingprotocol headers+ but e)cluding retransmissions7 on downlink

at the $$C protocol level. 'he range is 0 1 00 kbit@s

• RLC T&roug&put .L ">(it2#%: &ata throughput 3including

protocol headers+ but e)cluding retransmissions7 on downlink

at R$C protocol level. 'he range is 0 1 00 kbit@s

• Num(er o@ U#ed Time#lot# .L: !umber of timeslots in

use on the downlink. . 'he range is 0 1 A

GSM .ATA TIMESL,TS

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• TS C&annel T$pe: 'ype of channel in each timeslot on

downlink. Channel type+ also indicating which speech coder

is used. >or e)ample+ N'C*@> >/CC*@ > and S/CC*@%+

N?CC*+ or NP&C*. P&C* is the channel type for data in

#S%.

• C2I or#t: >or multi-slot allocations: 'imeslot list

corresponding to the C@( Korst element. 'he range is 0 1 ;

and an argumented value of 0 1 866. 0 gives the timeslot of

the channel having the worst C@(+ etc.

• BER2TS: ?it error rate for each used timeslot. <alid for data

services only. 'he range is 0 1 54G and an argumented value

of 0 1 ;. 0 represents the rst used timeslot 3not 'S 07+ etc.

• BLER2TS: ?lock error rate for each timeslot used. <alid for

data services only. 'he range is 0 1 600G and an

argumented value of 0 1 ;. 0 represents the rst used

timeslot 3not 'S 07+ etc.

• CS<n .ata: 'hese elements contain the distribution of

coding scheme usage 3on the downlink and for own data

only7 for each timeslot. 'he range is 0 1 600G and an

argumented value of 0 1 ;. 0 represents the rst used


• MCS<n .ata: 'hese elements contain the distribution of

modulation coding scheme usage 3on the downlink and for

own data only7 for each timeslot. 'he range is 0 1 600G and

an argumented value of 0 1 ;. 0 represents the rst used


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Tems Gsm Parameters

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