Thomas Kunz
Systems and Computer Engineering
28
Mobile Station
–Subscriber Identity Module
nISO compliant removable smart card, with limited
storage and computational functionality
nnecessary
for operation of mobile station, and involved in location
management, authentication, and ciphering
none or more directory numbers per SIM, one or
more SIMs per subscriber
nSIM realizes model of “personal mobility” (e.g.,
the subscriber is the focus of attention and it is he/she who is
mobile)
–Mobile Equipment
nonly emergency calls allowed without SIM
ncalls routed to SIM, not mobile equipment