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GSM (Services & Features (Telephone Srvices, Bearer Services or Data…
GSM
Services & Features
Telephone Srvices
Bearer Services or Data Services
Supplementary ISDN services
Subscriber Identity Module (SIM)
System Architecture (Figure)
Base Station Subsystem (BSS)
Mobile Station (MS)
Base Tranreceiver Station (BTS)
Base Station Controller (BSC)
Network Switching Subsystem (NSS)
Home Location Register (HLR)
Visitor Location Register (VLR)
Authentication Center (AUC), Equipment Identity Register (EIR)
Mobile Switching Center (MSC)
Operation Support Subsystem (OSS), Operation Maintenance Center (OMC)
Public Networks
Public Switching Telephone Network (PSTN)
Integrated Services Digital Network (ISDN)
Data Networks
Interfaces (Figure)
MS to BTS --> Air interface
BTS to BSC --> Abis interface
BSC to MSC --> A interface
MSC to PSTN --> SS7
GSM control channels (CCH)
Broadcast channels (BCH)
Broadcast control channel (BCCH)
Frequency correction channel (FCCH)
Synchronisation channel (SCH)
Common control channels (CCCH)
Paging channel (PCH)
Random Access channel (RACH)
Access Grant channel (AGCH)
(Figure) Broadcast and Common Control CH Multiframe
Dedicated control channels (DCCH)
Stand alone dedicated control channels (SDCCH)
Slow associated control channel (SACCH)
Fast associated control channels (FACCH)
Hand over mechanism
(Figure) Intra-cell handover
(Figure) Inter-cell, Intra BSC handover
(Figure) Inter BSC, Inter MSC handover
(Figure) Inter MSC handover
Security in GSM
Access control and authentication
Confidentiality
Anonymity
Encryption
Data Services
Short Message Service
(Figure) Mobile originated SMS
(Figure) Mobile terminated SMS
(Figure) High speed circuit switched data
(Figure) General packet Radio Service
(Figure) Enhanced data rate for global evolution
GSM call
(Figure) Mobile terminated call
(Figure) Mobile originated call
(Figure) Message flow for MTC and MOC
Radio Subsystem
(Figure) Speech Dedicated Control Channel Frame and multiframe structure
Parameter
Reverse Channel Frequency = 890 - 915 MHZ
Forward Channel Frequency = 935 - 960 MHZ
ARFCN Number = 0 to 124 and 975 to 1023
Tx/Rx Frequency Spacing = 45 MHz
Tx/Rx Time Slot Spacing = 3 Time slots
Modulation Data Rate = 270.83 kbps
Frame Period - 4.615 ms
Users per Frame (Full Rate) = 8
Time Slot Period = 576.9 us
Bit Period = 3.692 us
Modulation = 0.3 GMSK
ARFCN Channel Spacing = 200 kHz
Interleaving = 40 ms
Voice Coder Bit Rate = 13.4 kbps
GSM Traffic Channels
Full rate TCH
Full rate speech channel (TCH/FS)
Full rate data channel for 9600 bps (TCH/F9.6)
Full rate data channel for 4800 bps (TCH/F4.8)
Full rate data channel for 2400 bps (TCH/F2.4)
Half rate TCH
Half rate speech channel (TCH/HS)
Half rate data channel for 4800 bps (TCH/H4.8)
Half rate data channel for 2400 bps (TCH/H2.4)
(Figure) Burst structure
(Figure) Frame structure