modul2-gsmairinterface-131010060634-phpapp02.ppt

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GSM-GPRS Operation

GSM Air Interface

Module 2


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Outline

Introduction & Review

GSM Frequency and

GSM !"annel #um$ering

%"ysical !"annel

ogical !"annel

Ma''ing ogical !"annel on to %"ysical

!"annel


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Air Interface = Um Interface

Major 'ro$lems at air inter)ace In GSM

network* it is a$out Um interface

Air interface


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GSM %&& M'( "re)uenc* Band

200 kHz

CH 1 CH 2

CH 124

200 kHz

CH 1 CH 2

CH 124

890 915 MHzUplink

MS Transmit Band

25 MHz

935 960 MHzDownlink

MS Transmit Band

25 MHz


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Penomoran +anal GSM

GSM%&&

F3n4 5 678 9 8.2×n 3M:;4F3n4 5 Fu3n4 9 +0 3M:;4 < ≤ n ≤


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GSM "re)uenc* Allocation In Indonesia

SATELINDO (INDOSAT) : 890 – 900 MHz(10 MHz)

TELKOMSEL : 900 – 907 MHz (7.5MHz)

EXCELKOMINDO : 907.5 – 915 MHz (7.5MHz

GSM : [890+nx0.2] MHz u t! 91"MHz

#CS 1800 : [1$10+nx0.2] MHz u t! 1$8"MHz

890 91"

Tx

%nd!sat T&'k!ms&' (x)&')!mind!

900

Operators sharebandwidth


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"re)uenc* Allocation Per-2ell

1 2 3 4 5 6 7

1$10 1$*2

Selanjutnya...bandwidth

displit di dalam sel-sel

1

1

23

2

4

5

6

7

3

4

5

6

7

1


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S!esifikasi 1"

45 M'(

BS 6ransmission

Band 7 %85 9 %:& M';

MS 6ransmission

Band 7 /%& 9 %.5 M';

Year I!r"#$%e# 1990

A%%e&& 'e!"# TDMA

Cae*a#+,#!

200 kHz

N$'-er " #$/e

%ae&

125

&er& /er %ae 8

S/ee% %"#,2 -,!ra!e

13 kbps

Da!a %"#,2 -,!

ra!e

12 kbps

3ra'e &,ze 4.6 ms


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GSM-GPRS Operation

!anal Fisi"


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P*sical cannel 0Um3P*sical cannel 0Um3

1adio Interface 0a*er .3


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"


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GSM-GPRS Operation

!anal #o$i"


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ogical 2annel


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GSM-GPRS Operation

Mappin$ !anal #o$i" "e !anal

Fisi"


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"22' Burs tS2' Burs t

Sync"roni;ation

!"annel

Frequency!orrection

!"anneledicated!ontrol!"annels

-ra))ic

!"annel

Normal Burs t

Danal RF sele$ar 288 k:; Rel kereta

Danal logik Isi ger$ong kereta

Danal )isik 3timeslot4 Ger$ong kereta

urst -i'e,jenis ger$ong

+asus analogi di GSM

Ma!!ing


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5.? 5.8 5.4 /&/ /&% /.&

?%% ?&&k'( 1adio 2annels

"


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6B8

Information5>

S.

6raining Se)?:

S.

6B8

GP/?5

Information5>

& . ? 8 4 5 : >

1"2

.

1"2

?

1"2

8

1"2

i

1"2

.?8

1"2

.?4

••• •••

B 678 M:; 7


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GSM-GPRS Operation

&nd of Section ' GSM Air Interface

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