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8/13/2019 Gbc 001 e1 1 Gsm Basic-40
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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-
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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
Recommended