GSM provides a variety of standard services and built-in security measures:
A permanent database containing subscriber profiles and their last known location. GSM – Architecture, Protocols and Services
Uses modified versions of LAPD (called LAP-Dm) for the air interface and SS7 protocols (MTP) for the network interface. Layer 3 (Network): Divided into three sublayers: GSM provides a variety of standard services and
Often called the core network, it performs call switching and manages subscriber mobility. Key components include: GSM – Architecture, Protocols and Services