Download - Gsm overview
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GSM OVERVIEW
Others ….
MSC
BTS
BSC
BTS PSTN
BTSISDN
SS#7MS
MS
MS
MS
MS
MS
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Mobile Station
Base Transceiver
Station
Base Station
Controller
Mobile Service
Switching Center
Visitor Location Register
Home Location Register
Authentication
Center
Equipment Identity Register
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GMSCUser
HLR
MSCVLRDirectory
NumberRoutingNumber
RoutingNumber
DirectoryNumber
GMSC handling of a domestic call
GMSC
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ÑÒNH NGHÓA CAÙC SOÁ VAØ NHAÄN DAÏNG TRONG HEÄ THOÁNG GSM Soá ISDN cuûa traïm di ñoäng MSISDN
MSISDN = CC+ NDC+ SN
Soá löu ñoäng cuûa maùy di ñoäng MSRN(Mobile Station Roaming Number).
MSRN = CC + NDC + SN
Nhaän daïng thueâ bao di ñoäng quoác teá IMSI (International Mobile Subscriber identity)
IMSI = MCC + MNC + MSIN.
Nhaän daïng thueâ bao di ñoäng taïm thôøi TMSI (Temporary Mobile Subscriber Identity)
Nhaän daïng thieát bò cuûa traïm di ñoäng quoác teá IMEI (International Mobile Equipment Identity)
IMEI = TAC + FAC + SNR + SP
Nhaän daïng vuøng ñònh vò LAI (Location Area Identity)
LAI = MCC + MNC + LAC
Nhaän daïng oâ toaøn caàu (CGI) (Cell Global Identity)
CGI = MCC + MNC + LAC + CI
Maõ nhaän daïng traïm goác (BSIC) (Base Station Identity Code)
BSIC = NCC + BCC.
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Authentication & Encryption
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Authentication & Encryption
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Radio S
ubsystem
RPE-LTPencoder
RPE-LTPdecoder
13 bit uniform to 8 bit A-Law
8 bit A-Law to 13 bit uniform
MS
C
PSTN/
ISDN
104 kbps13 kbps
8000 samples/s13-bit uniform
code
Analoguespeech
8000 samples/s13-bit uniform
code
8000 samples/s8-bit A-Law
ITU-T G.711, G.712,G.713, G.714
RPE-LTPencoder
RPE-LTPdecoder
13 bit uniform to Analogue
O/P
Analogue to 13 bit uniform
I/P
104 kbps 64 kbps13 kbps
System Description
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Radio Access & Demod
GMSK
De-Interleaving
Forward Error
CodingInterleaving
Radio Access & ModGMSK
InterleavingForward
Error Coding
Error Correction
Radio Access & ModGMSK
Error Correction
De-Interleaving
Radio Access & Demod
GMSK
Dup Dup
Encoded speech456 bits/frame 20ms
Encoded speech456 bits/frame 20ms
22.8kbps 22.8kbps13 kbps 13 kbps
System Description
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Signalling in GSM network
OAM
LAPD
BTS
MTP2
SCCP
MTP3
LAPD
OAM
RR
DTAP
BSSMAP
BSSAP
BSC
MTP1
MTP3
MTP2
SCCP
MTP2
MTP3
SCCP
BSSAPDTAP/
BSSMAP
TCAP
MM
CM MAP
NSS
RR
MM
CM
MS
UmInterface
A bisInterface
AInterface
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GSM Specification
Access methodAccess method TDMA/FDMATDMA/FDMA
Frequency band (MS to BS)Frequency band (MS to BS) 890 - 915 MHz890 - 915 MHz
Frequency band (BS to MS)Frequency band (BS to MS) 935 - 960 MHz935 - 960 MHz
Channel bandwidthChannel bandwidth 200 kHz200 kHz
ModulationModulation GMSKGMSK
Bit rateBit rate 270.833 kbps270.833 kbps
FilterFilter BT = 0.3 (Gaussian)BT = 0.3 (Gaussian)
Voice channel codingVoice channel coding RPE-LPC Convolutional 13 kbpsRPE-LPC Convolutional 13 kbps
Frequency HoppingFrequency Hopping Slow hopping (217 hops/s)Slow hopping (217 hops/s)
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THANK YOU