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.
Verifies user identities and provides security keys for encryption. 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 central node for call routing and management. GSM – Architecture, Protocols and Services