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GSM (Global System for Mobile communication) is a digital mobile telephony system that is widely used in Europe and other parts of the world. GSM uses a variation of time division multiple access (TDMA) and is the most widely used of the three digital wireless telephony technologies (TDMA, GSM, and CDMA).
There are two main types of GSM channels viz. physical channel and logical channel. Physical channel is specified by specific time slot/carrier frequency. Logical channel run over physical channel i.e. logical channels are time multiplexed on physical channels; each physical channel will have either 26 Frame MF(Multi-frame) or 51 Frame MF structure describe here. logical channels are classified into traffic channel and control channel. Traffic channel carry user data. Control channels are interspersed with traffic channels in well specified ways.
Founded : 2017
CHANNELS OF : GSM
ARCHITECTURE : A GSM network comprises of many functional units. These functions and interfaces are explained in this chapter. The GSM network can be broadly divided into:
The Mobile Station (MS)
The Base Station Subsystem (BSS)
The Network Switching Subsystem (NSS)
The Operation Support Subsystem (OSS)The additional components of the GSM architecture 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)