GSM Protocol Stack explained
Protocol Stack

GSM Layer 1 Radio Transmission
GSM900
Upstream : 890 ~915 Mhz
Downstream : 935 ~ 960 Mhz
Duplex Interval : 45 Mhz
Bandwidth : 25 Mhz
Frequency Interval : 200 Khz
TDM / FDMA
Modulation – GMSK
GSM Layer 2 – Data Link Layer DLL
LAPDm Link Access Procedure
GSM Layer 3 Messaging Layer
RR Radio Resource Management
- Channel Allocation
- Handover
- Timing Advance
- Power Control
- Frequency Hopping
MM Mobility Management
- Location Management
- Security
CM Connection Management
- Call Control CC
- Supplementary Services
- Short Message Service
Call Control CC Sub Layer
- Call Routing
- Call Establishment
- Maintenance
- Release
GEO-Mobile Radio Interface Specifications (Release 3)
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