Gsm Вђ“ Architecture, Protocols And Services -

Often called the core network, it performs call switching and manages subscriber mobility. Key components include:

The central node for call routing and management. GSM – Architecture, Protocols and Services

GSM provides a variety of standard services and built-in security measures: Often called the core network, it performs call

A temporary database storing information for subscribers currently roaming in its area. Often called the core network

Uses the Subscriber Identity Module (SIM) to store unique identity information. Security is maintained through a challenge-response authentication mechanism and over-the-air encryption using algorithms like A5.