The Mobile Station (MS) consists of the physical equipment used by a PLMN subscriber to
connect to the network. It comprises the Mobile Equipment (ME) and the Subscriber Identity
Module (SIM). The ME forms part of the Mobile Termination (MT) which, depending on the
application and services, may also include various types of Terminal Equipment (TE) and
associated Terminal Adapter (TA).
connect to the network. It comprises the Mobile Equipment (ME) and the Subscriber Identity
Module (SIM). The ME forms part of the Mobile Termination (MT) which, depending on the
application and services, may also include various types of Terminal Equipment (TE) and
associated Terminal Adapter (TA).
GSM Mobile Terrminal ((MT)
The two parts of the mobile station allow a distinction between the actual equipment and the
subscriber who is using it.
The IMSI identifies the subscriber within the GSM network while the MS ISDN is the actual
telephone number a caller (possibly in another network) uses to reach that person.
subscriber who is using it.
The IMSI identifies the subscriber within the GSM network while the MS ISDN is the actual
telephone number a caller (possibly in another network) uses to reach that person.
The Mobile Station (MS)
• The mobile station consists of:
• mobile equipment (ME)
• subscriber identity module (SIM)
• The SIM stores permanent and temporary data about
the mobile, the subscriber and the network, including:
• The International Mobile Subscribers Identity (IMSI)
• MS ISDN number of subscriber
• Authentication key (Ki) and algorithms for authentication check
• The mobile equipment has a unique International Mobile
Equipment Identity (IMEI), which is used by the EIR
Security is provided by the use of an authentication key (explained later in this section) and
by the transmission of a temporary subscriber identity (TMSI) across the radio interface where
possible to avoid using the permanent IMSI identity
• mobile equipment (ME)
• subscriber identity module (SIM)
• The SIM stores permanent and temporary data about
the mobile, the subscriber and the network, including:
• The International Mobile Subscribers Identity (IMSI)
• MS ISDN number of subscriber
• Authentication key (Ki) and algorithms for authentication check
• The mobile equipment has a unique International Mobile
Equipment Identity (IMEI), which is used by the EIR
Security is provided by the use of an authentication key (explained later in this section) and
by the transmission of a temporary subscriber identity (TMSI) across the radio interface where
possible to avoid using the permanent IMSI identity