Mobile and its status in telecom

Mobile Station

Mobile station consist of two parts i.e. handset and a Subscriber Identity Module (SIM).

SIM stores integrated circuit card identifier (ICCID), International mobile subscriber identity (IMSI) and Authentication key (Ki -128bit) which is used to identify and authenticate subscriber in network. Refer further details on SIM card here.

The range and coverage area of a mobile station depend on the output power of mobile.

States of a mobile station: Idle (mobile is ON but no call), Active (call on progress) and Detached (mobile switched off).

  • When we switch on mobile station, it always informs network that I am attached in network now. This is called registration.
  • When a mobile station moves across other network with home network in idle case, then this is called Roaming.
  • When a mobile station leave home network and enter into another network with roaming agreement, then it is called international roaming.
  • On every location area update of mobile station in network is called location updating.
  • Process in which the telecom network broadcast a paging message containing the identity of mobile station in order to connect to mobile station is called Paging.
  • Handover is a process in which a call path switched from one physical channel to another.



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