Description of the Global System for Mobile Communications?

Global System for Mobile Communication Abbreviated as GSM.GSM is a Digital Mobile Network Widely used in Europe and other Countries.GSM system includes BTS(Base Transceiver Station),BSC(Base Station Controllers),MSC(Mobile Switching Center),Mobility management and security functions.To cover a certain boundary there is Base Transceiver Station(BTS) which covers the signal received from MS. How many Base Transceiver and Station (BTS) are again controlled by Base Transceiver Controller (BSC).BTS and BSC together form the Base Station Subsystem (BSS).Traffic from mobile stations is aggregated through Mobile Switching Center (MSC).