System for mobile communication based on a Pan-European standard using 900 MHz frequency band.
GSM Architecture
RSS (Radio Sub-system)
- MS (Mobile Station)
- ME (Mobile Equipment)
- SIM (Subscriber Identity Module)
- BSS (Base Station Sub-system)
- BTS (Base Transceiver Station)
- BSC (Base Station Controller)
NSS(Network & Switching Sub-system)
- MSC (Mobile Switching Center)
- HLR (Home Location Register)
- VLR (Visitors Location Register)
- AuC (Authentication Center)
- EIR (Equipment Identification Register)
OMS(Operation & Maintenance Sub-system)
- OMC-R (Operation Maintenance Center for BSS)
- OMC-S (Operation Maintenance Center for NSS)
- OMC-T (Operation Maintenance Center for Transmission)
GSM Operation Band
Absolute Radio Frequency Channel Number（ARFCN）
nGSM900 :
lFu (n) = 890 + 0.2´n MHz
lFd (n) = Fu(n) + 45 MHz，01£ n £ 124
GSM1800 :
lFu (n) = 1710.2 + 0.2´(n-512) MHz
lFd (n) = Fu(n) + 95 MHz，512 £ n £ 885
Mobile Originating Call Establishment Procedure
The Flowchart shows 'conversation' between MS - MSC.