GSM Cellular Communication

A GSM network is composed of several functional entities, Below diagram illustrates the layout of a generic GSM network.
The GSM network can be divided into three broad parts.
·         The Mobile Station
                   Performs the switching of calls between the mobile users, and between mobile and fixed network users
·         The Base Station Subsystem
                  BSS Controls the radio link with the Mobile Station.
·         The Network Subsystem
                  Network subsystem includes the MSC,VLR,HLR

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