Mobile architecture
International mobile station identity (IMSI)
The mobile station’s identification uniquely identifies the MS
An uniquely assigned radio communication facility between a
mobile station and a base station intended to carry a call.
The radio communication facility between a mobile station and a
base station intended to carry all the information transfer between
the mobile station and the MSC, in which area the mobile station
currently is located, during the time when no radio traffic path
between the BS and the MS is assigned.