Overview#
Global System for Mobile Communications (GSM) is a standard developed by the European Telecommunications Standards Institute (ETSI) to describe the protocols for second-generation (2G) digital cellular networks used by mobile Devices, first deployed in Finland in July 1991.[2] As of 2014 it has become the default global standard for mobile communications - with over 90% market share, operating in over 219 countries and territoriesGlobal System for Mobile Communications is a globally accepted standard for digital cellular communications.
Global System for Mobile Communications uses narrow band Time Division Multiple Access (TDMA) for providing voice and text based services over mobile phone networks.
Details #
The Mobile Switching Center (p) is the primary service delivery node for GSM/CDMA, responsible for routing voice calls and SMS as well as other services (such as conference calls, FAX and circuit switched data).The GSM network can be broadly divided into:
- Mobile Station
- Base Station Subsystem (BSS)
- Network Switching Subsystem (NSS)
- Operation Support Subsystem (OSS)
Additional components comprise of databases and messaging systems functions:#
- Home Location Register (HLR)
- Visitor Location Register (VLR)
- Equipment Identity Register (EIR)
- Authentication Center (AuC)
- SMS Serving Center (SMS SC)
- Gateway MSC (GMSC)
- Chargeback Center (CBC)
- Transcoder and Adaptation Unit (TRAU)
- Authentication Center (AuC)
