dasar optimasi gsm

7/21/2019 Dasar Optimasi GSM

1/15

Dasar-Dasar Optimasi

Sistem Telekomunikasi GSM

Oman, Tembalang SMG, 18 Desember 2004


2/15

ANTENNA CLEARANCE

Building

H

>= 2H

Shadow Area

Building

H

>= 2H

Shadow Area

Obstacle

2 m

2 m

Building

Average Building Height

(tinggi rata-rata tinggi

bangunan yg akan di

cover

! m lebih tinggi dari rata-rata tinggi bangunan Coverage Area



3/15

Building

Average Building Height

(tinggi rata-rata tinggi

bangunan yg akan di

cover

! m lebih tinggi dari rata-

rata tinggi bangunan Coverage Area

Area yg di "lan Area yg tidak

di "lan



4/15

TEORI ANTENNA

Pattern, Gain

Pattern

- Horizontal Pattern

- Vertical Pattern

Hori#on$ o% o

% o

Vertical Beam Width

& db

& db

'o" iew

) o

Horizontal Beam W idth

& db

& db

i!a Vertical Beam Widthlebi"Besar#anHorizontal Beam Width lebi"Besar ma!aGain $g #i"asil!an lebi"Kecil

i!a Vertical Beam Width lebi"Kecil#anHorizontal Beam Width lebi"Kecil ma!a

Gain $g #i"asil!an lebi"Besar



5/15

TILT

1% &clectrical Tilt 'nilai Tilt #iat(r secara ele!troni!)

2% Mec"anical Tilt 'nilai Tilt #iat(r secara man(al #g menggeser antenna ses(ai

#g tilt $g #iingin!an)

&lectrical Tilt

1% Variable 'nilai Tilt #a*at #i(ba"-(ba")

2% +ie# 'nilai Tilt teta*)

&e! Tilt *a#a &lectronic Tilt #an Mec"anic Tilt

DOWN TILTNORAL

ELECTRICAL TILT

DOWN TILTNORAL

ECHANICAL TILT



6/15

Overshooting

Pancaran sin$al #ari antenna memancar segaris #g "orizon se"ingga sin$al memancar

se.a(" !(at sin$al $g #i*ancar!an 'ara" *ancaran sin$al ta! ter"ingga)

Overshooting Antenna beam

*ormal Antenna beam

Polarisasi /ntenna

1% Vertical Polar

2% Horizontal Polar

% ross Polar ' Polar)

Vertical Polar #anHorizontal Polar bai! #ig(na!an (nt(! #aera" 3(ral '#aera" $g

ti#a! *a#at *en#(#(!n$a*e#esaan) ta*iHorizontal Polar.arang #ig(na!an%

Cross Polar bai! #ig(na!an (nt(! #aera" 5rban '#aera" $g *a#at

*en#(#(!n$a*er!otaan)% Cross Polar mer(*a!an gab(ngan #ari Vertical and

Horizontal Polar.

Fast Fading a#ala" gangg(an $g menggangg( *ancaran sin$al 'ge#(ng, ben#a

bergera!)

Slow Fading a#ala" gangg(an $g menggang( saat sin$al #i*ancar!an #g *osisi

bergera! '#i #alam !en#araan)

Vertical Polar #an ross Polar ti*e *olarisasi antenna $g ban$a! #ig(na!an saat ini

(ertical +olar

antenna element

Hori#ontal +olar

antenna element

,ross +olar

antenna element



7/15

INDETI!I"A#I #EL

1% 6H '6ase ontrol "annel)

2% ell 7D 'ell 7#entit$)

% 6S7

4% M 'Mobile o(ntr$ o#e)

% M9 'Mobile 9et:or! o#e)

;% (enc$) MS menent(!an ser?ing cellber#asar!an 6H #an 6S7,


8/15

NON HO%%IN$

',H ',HTR&' ',H S,,H ',HB,,H ',H',H

$ 2 & / ! 0 )

,HA**31 = 2

% '.43S1O'S

Base ,ontrol ,hannel

'ra5ic ,hannel

Signaling ,hannel 6 S4S

',H ',HTR&( ',H S,,H ',H ',H',H

$ 2 & / ! 0 )

,HA**31 = %

',H ',HTR&) ',H S,,H ',H ',H',H

$ 2 & / ! 0 )

,HA**31 = 22

',H

',H

Saat MS ter!one!si 'De#icate#) MS men#(#(!i #i T3 #a*at #i!eta"(i #engan

6H@12 /3+9@22

T31 @ 6H T3

T32 #an T3 @ TH T3

Pa#a 6H T3 *o:er selal( maim(m, *a#a TH T3 *o:er a!an ber?ariasi

'Po:er ontrol)

-0$ db

-)! db

TR&' TR&'

+ower 4a7imum

+ower

,ontrol

.13,all

Setu",onnected

#aat # mendudu*i Time+lot di BC CH TR&



9/15

-0$ db

-)! db

TR&' TR&(

+ower 4a7imum

+ower,ontrol

.13,all

Setu" ,onnected

#aat # mendudu*i Time+lot di TCH TR&

9ilai 7 @A #b 'arrier O?er 7ntererence)

9ilai /@A #b

Saat mela!(!an test T3, T/ 'Time /#?ance) @ 0 ata( 1



10/15

%OWER CONTROL

-)! db

-%$ db

Level , #ignal #trength

'ime

'ime

)

/

-ualit.

$

6&3@6it &rror 3ate



11/15

HO%%IN$

1% 6ase 6an# Ho**ing

2% S$nt"esize# +re>(enc$ Ho**ing 'S+H)

% 3+ Ho**ing '3+H)

Base Band Hopping

',H ',HTR&' ',H S,,H ',HB,,H ',H',H

$ 2 & / ! 0 )

A89,* = 2

',H ',HTR&( ',H S,,H ',H ',H',H

$ 2 & / ! 0 )

A89,* = /

',H ',HTR&) ',H S,,H ',H ',H',H

$ 2 & / ! 0 )

A89,* = 0

',H

',H

HS9 @ Ho**ing Se>(ence 9(mber

M/< @ 12, 14, 1;

M/7O @ Mobile /llocation 7n#e Oset

Synthesized Freqency Hopping !SFH"

',H ',HTR&' ',H S,,H ',HB,,H ',H',H

$ 2 & / ! 0 )

A89,* = 2

*on Ho""ing '8:

',H ',HTR&( ',H S,,H ',H ',H',H

$ 2 & / ! 0 )A89,* = /

Ho""ing '8:

4A1 = 2 0;2);2%;


12/15

HANDOVER

9oteC HO ter.a#i saat MS ter!one!si '#e#icate#), *a#a saat i#le #iseb(t ell Selection

ata( ell 3eselection

Ter.a#in$a HO *a#a ell Ser?er #itent(!an ole"C

1% P6GT 'Po:er 6(#get)

2%


13/15

Secara normal So(rce "ar(s s(#a" HO !e Target, !arena HO #i set *a#a le?el -A #bm

ma!a HO bel(m bias ter.a#i, !eti!a le?el signal strengt" menca*ai -A #bm So(rce

bar( HO !e Target

HO Layering (Umbrella dan FMMS)

5mbrella

Ter.a#in$a HO #ari sistem GSMA00 !e DS1800 #i tent(!an ole" nilai /5

dasar optimasi gsm

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