NSS - Network Switching Subsystem

Network Switching Subsystem (NSS)

The Network Switching Subsystem (NSS) is a key component in a GSM network responsible for call processing and subscriber mobility management. It consists of several network elements, including:

• Mobile Switching Center (MSC): Manages call setup, routing, and mobility.

• Home Location Register (HLR): A database storing details of each subscriber.

• Visitor Location Register (VLR): Temporarily holds data about subscribers currently in the MSC area.

• Authentication Center (AUC): Provides data for verifying user identity.

• Equipment Identity Register (EIR): Keeps records of mobile equipment to prevent fraud.

The NSS facilitates communication between mobile users and connects them to other networks.