GSM uses a layered protocol structure for communication between the mobile station and the network:
The GSM network architecture is divided into three primary subsystems that manage communication, switching, and operations:
GSM provides a variety of standard services and built-in security measures: GSM – Architecture, Protocols and Services
Manages radio transmissions over the air interface (Um interface) using a combination of FDMA and TDMA .
The Global System for Mobile Communications (GSM) is the foundational standard for second-generation (2G) digital cellular networks. It was developed to provide a unified digital mobile system that facilitates seamless international roaming and secure voice and data services. GSM uses a layered protocol structure for communication
Manages call control (CC), Short Message Service (SMS), and supplementary services. Services and Security
A temporary database storing information for subscribers currently roaming in its area. Manages call control (CC), Short Message Service (SMS),
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: