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|POWERED BY www.hesamp74.blogfa.com| GSM : : GSM 1 GSM 5 7 14 8 10 - 13 GSM 16 GSM . [ ]( PLMN ) . GSM . GSM GMSK QPSK GMSK FM . . Downlink ( BTS MS ) Uplink ( MS BTS ) . Downlink July 2008| [email protected] | MyLOGO - GSM,MS,BSS,NSS,OSS, Downlink , Uplink [email protected] 1 Computer , Network & Electronics POWERED BY : www.hesamp74.blogfa.com GSM1 - 1 : GSM GSM
. [ ( ] PLMN
) . GSM . GSM (-) . GSM 4 : MS
BSS4 NSS
OSS
( Interface ) GSM : A MSC BSC
Abis BSC BTS
Um Air MS BTS1 - 1 - 1 : MS ( )MS . . ( ME
)
Frequency Reuse
Public Land Mobile Network
Mobile Station
Base Station Subsystem
Network Switching Subsystem
Operation and Support Subsystem
Base Station Controller
Base Tranciver system [email protected] 2 Computer , Network & Electronics POWERED BY : www.hesamp74.blogfa.com . ( SIM
) ( MS ) . ME IMEI
. IMSI
SIM . (-) GSMBSS :1-1-2 MS . BSS BSC BTS Abis BSC BTS A BSC MSC .BTS :1-1-2-1BTS BSC . BTS BTS
Mobile Equipment
Subscriber Identity Module
International Mobile Equipment Identity
International Mobile Subscriber Identity [email protected] 3 Computer , Network & Electronics POWERED BY : www.hesamp74.blogfa.com BTS TRX . BTS . BTS : ( Frequency Hopping ) MS BSC MS BTS MS BSC MS BSC : 1-1-2-2BSC GSM BSC : BTS MS MS MSCBSC BTS ( E1 T1 ) Abis Abis 16kbps A 64kbps BSC MSC TRAU
16kbps 64kbps .3 - 1 - 1 : NSS ( ) NSS ISDN ( PSTN4) :
MSC
GMSC
HLR
VLR
EIR
AUC
Transcoder Rate Aduption Unit
Public Switching Telephony Network [email protected] 4 Computer , Network & Electronics POWERED BY : www.hesamp74.blogfa.com (-: ) NSS (-: ) BSS MSC---( : ) MSC . MSC E1 MSC 64 kpbs : ( Location Updating ) ( Registration & Authentication ) Handover BSC
Mobile Switching Center
Gate Mobile Switching Center
Home Location Register
Visitor Location Register
Equipment Identity Register
Authentication Center [email protected] 5 Computer , Network & Electronics POWERED BY : www.hesamp74.blogfa.com 1 - 2 : GSM1 - 2 - 1 GSM :GSM (-) . . : Downlink BTS MS . . Uplink : MS BTS . (-: ) GSM ( 4 -: ) Downlink Uplink1 - 2 - 2 . (-) . [email protected] 6 Computer , Network & Electronics POWERED BY : www.hesamp74.blogfa.com (-:) GSM --- : BTS . (-) . (-:) Frequency Reuse --- ( Location Area ) BSC . MSC/VLR LA . LA MS ( Location Updating ) . LA MS BTS . [email protected] 7 Computer , Network & Electronics POWERED BY : www.hesamp74.blogfa.com --- MSC VLR MSC . --- 4 : ( PLMN ) ( MSC ) . PLMN .1 - 3 : GSM GSM GMSK QPSK GMSK FM . GMSK (-) QPSK (-) . GSM kbps 270/833 . (-: ) GMSK (-: ) QPSK GSM . [email protected] 8 Computer , Network & Electronics POWERED BY : www.hesamp74.blogfa.com 1 - 4 : GSM1 - 4 - 1 :
. GSM . 4.4 . (-) . Burst . (-: ) .1 - 4 - 2 : . . ( TCH ) . ( CCH )
Downlink & Uplink [email protected] 9 Computer , Network & Electronics POWERED BY : www.hesamp74.blogfa.com (-: ) - 4 --: . ( FULL RATE ) ( HALF RATE ) - 4 -- (
CCH ) : : . ( BCH ) . ( CCCH ) . ( DCCH ) - 4 ---: ( BCH ) : . ( FCCH ) . ( SCH ) . ( BCCH )
Control Channel [email protected] 10 Computer , Network & Electronics POWERED BY : www.hesamp74.blogfa.com (-) . (-) location Updating MTC1 - 5 : 1 - 5 - 1 . GSM ... . (-) (-) . [email protected] 11 Computer , Network & Electronics POWERED BY : www.hesamp74.blogfa.com (-:) (-: )1 - 5 - 2 : GSM MHZ300 . : 30 MHZ ( (VHF,UHF,SHF BAND . . . . [email protected] 12 Computer , Network & Electronics POWERED BY : www.hesamp74.blogfa.com 1 - 5 - 3 : Ae = 2 / 4 : : Pr= P x AePr= (Pt / 4d2) x (2 / 4)= Pt x ( / 4d)2 dB : L = 20 log( 4d / ) dBL = 32.5 + 20 log d + 20 log f dB D f .1 - 5 - 4 : (-) . GSM 900MHZ 30cm 1800MHZ 15cm . [email protected] 13 Computer , Network & Electronics POWERED BY : www.hesamp74.blogfa.com - : : (-:) 1 - 5 - 5 : - Lp(urban)=69.55+26.16log(f)-13.82log(hb)-a(hm)+(44.9-6.55 log(hb)) log(d) a(hm) MS . [email protected] 14 Computer , Network & Electronics POWERED BY : www.hesamp74.blogfa.com ( 4 -: ) - 1 - 6 : 1 - 6 - 1 : . Downlink ( BTS MS ) Uplink ( MS BTS ) . Downlink . MS . ( Fade Margin ) .
. .
penetration loss [email protected] 15 Computer , Network & Electronics POWERED BY : www.hesamp74.blogfa.com Downlink 1-6-2 24 (-) BTS MS . BTS 3db . . . (-:) Downlink1 - 6 - 3 : Uplink MS . ( Uplink ) . BTS (. ) (-) . (-: ) Uplink
Power Budget [email protected] 16 Computer , Network & Electronics POWERED BY : www.hesamp74.blogfa.com (-) GSM