2. content
1. Gsm network architecture
2. Gsm in world
3. GSM IDENTITES
4. mobile station roming numbar
5. CDMA
6. Comparigen between CDMA and GSM
3. Gsm network architecture
• gsm a digital
mobile
telephone
system .
• use Europ
(43%)or
asia(37%).
• TDMA(time
division multipal
access)
4. Gsm network architecture
1. mobile station = mobile
(equipment)+SIM(subscriber identity
modual)
2. Base station=
radio interface help mobile station
canneat.
Bss(network and switching system)
cannect.
BTS(base transfer station)and BSS(base
station cantrol) cansist
5. 3. Network sub system
(nss)= differant gsm user
cammunication manage.
sub system
• mobile service switching
center= call set up
• home location ragister(HLR)=
currant
• visitar location ragister(VLR) =
6.
7. GSM IDENTITES
gsm identities numbar screen
subscriber
calling gsm n/w use
subscriber identity corrcet or uniquic
mobile station associated
numbar
MSI==CC+NDC+SN
8. Types of mobile station associted number
1. internationl mobile subscrber
identity =
usern uniqic identity allocat
use radio path carrect subscribar
identifacation
exmpal
9. 2. internationl mobile equipment
identiy(imei)
• use n/w mobile equipment uniquely
identify
• use basically sccurity processar
• 6 digit 2digit 6digit 1digit
(TAC)=time approval code
(FAC)=final assenby code
(SNR)=serial na.
TAC FAC SNR SPARE
10. 3. temparary mobile subscriber identity
• use subscriber identity protect
• time itervals change
• tmsi (msc/vlr)
11. Mobile Station Roaming Number
Mobile Station Roaming Number:- MSRN is a temporary identity which is
assigned during the establishment of a call to a roaming substation.
Mobile Station Roaming Number
New Network
11
MSC
HLR
(BSS)
Other
MSC
HLR
(Other BSS)
12. mobile station roming numbar
msrn temppary nw identity
• ms new n/w visit
• home nw incoming calls farword
numbars
msrn (HLR) store
13. Types of MSRN
Location area identity:-temparary nw identity
routing
Cell global identity:- gsm use local area indivisual
call identify
base station identify:- mobile station different base
station send same fequeucy
identify
15. Comparigen between CDMA and GSM
CDMA
GSM
fequency band singal (550 mhz) multipal(550/900/1800m
hz)
storage type interanl memory sim card
network service handset specific sim specific
transfer speed faster bits lower
market share 24% only 76%
voice and data at some
time
no yes
area u.s world wide