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GBC_001_E1_1 GSM Basic

ZTE University

GSM-BSS Team

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Objective

At the end of this course, you will be able to:

Understand GSM system architecture

and function

State GSM common events

Describe basic calling process

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Content

GSM System Overview

GSM ommon !vents

"asic alling #rocess

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AMPS

TACS

NMT

Others

1G

Analog

GSM

CDMAS!"

TDMAS#1$%

PDC

&G

Digital

Mar'et

Driving

$G

MT#&000

(MTS

)CDMA

CDMA

&000

Mar'et

Driving

TD#SCDMA

Mobile Teleco**+nication Technolog, Evol+tion

GSM S,ste* Overvie-

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GSM .istor,

1989 GSM Standard Take effect

1

1991 GSM system launched commercially

2

1994 GSM enter into China

3

2000 China Mobile

400 million subscribers

4

Custome

r

Demand

Competition

Technology

Development

GSM S,ste* Overvie-

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Develo/*ent o *obile co**+nication s,ste*

1 '

1 M

& M

Bits

Messaging

SMS

2oice

Gra/hics

te3t

Me4i+*

5+alit,

.igh

5+alit,

Mobile Oice

2i4eo(MTS(MTS

GP6SGP6S

$%%$

$%%%

GSMGSM10 '

&''' "% '

EDGEEDGE $%%&

11" '

$78 '

Al-a,s#on

GSM S,ste* Overvie-

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The -a, to $G

GSM S,ste* Overvie-

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Meaning o GSM

GSM: Group Special Mobile

GSM: Global System for Mobile

GSM S,ste* Overvie-

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GSM s/eciication

(ield &: General

(ield $: Services

(ield ): *etwor+ (unctions

(ield : MS-"S .nterfaces and #rotocols

(ield /: #hysical 0ayer on 1adio #ath

(ield 2: Speech oding

GSM S,ste* Overvie-

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GSM s/eciication

(ield 3: MS 4erminal Adaptor

(ield 5: "S-MS .nterface

(ield ': *etwor+ .nter-wor+ing

(ield &%: Service .nter-wor+ing

(ield &&: !6uipment and Model Acceptance Specification

(ield &$: Operation and Maintenance

GSM S,ste* Overvie-

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GSM Net-or' 4evelo/*ent

&'5$: 4he group special mobile

&'52: On-site test

&'53: 4DMA, 1#!-04#, GMS7

&'55: MOU

&'5': GSM too+ effect

&''&: (irst GSM networ+ was deployed

&''$: GSM standard was fro8en

&''): GSM phase $ complete

&'': GSM phase $9 for mobile data service

GSM S,ste* Overvie-

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GSM s,ste* architect+re

BTS

BSC

MSC

VLR HLR AuC EIR

PSTN,ISDN...

OMCOMC

NMCX.25 links

GSM inte!"#es

V$i#e%"il Se&e

SM'SC

MS (Mobile Station)

BSS (Base Station System)

NSS(Network Switching

Subsystem)

OMS(Operations & MaintenanceManagement)

MS

GSM S,ste* Overvie-

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GSM net-or' entities

MS 9Mobile Station:Mobile !6uipment

Subscriber .dentity Module S.M;

MS 9Mobile Station:Mobile !6uipment

Subscriber .dentity Module S.M;

BTS 9Base Transceiver Station:#rovide radio channels

BSC 9Base Station Controller:1adio resource management

4ranscoder

BTS 9Base Transceiver Station:#rovide radio channels

BSC 9Base Station Controller:1adio resource management

4ranscoder

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GSM net-or' entities

.;6 9.o*e ;ocation 6egister:Database

Subscriber data

Subscriber location infoavelength ?)) cm ?)) cm ?&3 cm ?&2 cm

"andwidth $/ M=8 )/ M=8 3/ M=8 2% M=8

Duple@ Distance ,/ M=8 ,/ M=8 '/ M=8 5% M=8

arrier Separation $%% +=8 $%% +=8 $%% +=8 $%% +=81adio hannels &$/ &3/ )3/ )%%

GSM S,ste* Overvie-

GSM S t O i

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Absol+te ra4io re5+enc, channel

N+*ber A6>CN

GSM'%%

(u n; 5'% 9 %

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M+lti/le Access Technolog, 9MAT:

Many subscribers share common telecommunication lines

without interference to each otherDMA

TDMA

CDMA

GSM S,ste* Overvie-

GSM S,ste* Overvie-

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>DMA

(DMA

4enti, b, re5+enc,

4ime

>re5+enc,

>DMA

GSM S,ste* Overvie-

GSM S,ste* Overvie-

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TDMA

4DMA

4enti, b, ti*e

Ti*e

>re5+enc,

TDMA

GSM S,ste* Overvie-

GSM S,ste* Overvie-

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CDMA

DMA

4enti, b, co4e

Ti*e

>re5+enc,

CDMA

Co4e

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Content

GSM System Overview

GSM ommon !vents

"asic alling #rocess

GSM Co**on Events

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S+bscriber stat+s

.MS. Attach

.MS. Detach

MS busy

GSM Co**on Events

GSM Co**on Events

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;ocation (/4ate

Originated by MS

0ocation info stored in

S.M

MS monitor system

info originate location

update once the new

0A is different from that

in S.M

HLR

VLR

MSC (old)

VLR

MSC %ne&'

0ocationUpdate

GSM Co**on Events

GSM Co**on Events

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;ocation (/4ate

4ype

Po-er on

MS ATTAC.DETAC.

;ocation register

MS /o-er ono

Nor*al location +/4ate

MS change ;A

Perio4ic location +/4ate O/erator 4eci4e the

/erio4 9ti*er:

;ocation +/4ate -hen

ti*e o+t

VLRMSC

0A $0A &

O*

GSM Co**on Events

GSM Co**on Events

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.an4over

>hy need handover

7eep and save the call in progress

.mprove networ+ service 6uality Decrease call drop rate

Decrease congestion rate

>ho will be involved

MS "4S "SMS

MSmeasure downlin+ radio signal level

"4Smeasure uplin+ radio signal level and 6uality and send the

results to "S

"S evaluate and decision of =O

MS routes the call to the other MS during .nter-MS =O

.an4over: =and-over is a process that transfers a MS that is in settingup or busy status to a new traffic channel

GSM Co**on Events

GSM Co**on Events

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.an4over classiication

Reason:

(B$T

Signal level

Signal )uality

Distance

Tra**ic

TA:

Synchronous

!synchronous

Position:

Intra+cell

Inter+cell

Intra+BSC

Inter+BSC

Inter+MSC

GSM Co**on Events

GSM Co**on Events

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Cell selection an4 6eselection

After a MS is turned on, it will attempt to contact

a common GSM #0M*, so the MS will select an

appropriate cell, and e@tract from it the

parameters of the control channel