| GSM Network
Architecture |
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| External |
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| Networks |
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| GSM network |
| user |
| HLR |
| AuC |
| BTS |
| BSC |
| MS |
| BTS |
| MSC |
| BSC |
| BTS |
| VLR |
| EIR |
|
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| Mobile |
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| Station |
|
|
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| Base Station |
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| Subsystem |
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| Network and
Switching |
|
| Subsystem |
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