Its an internationally-unique serial number allocated to Mobile Station (MS) hardware at the time of manufacture. It is registered by the network operator & stored in Aunthetication Center (AuC) for Validation purpose. This number consists of type approval code, final assembly code and serial number of the mobile station. The network stores the IMEI numbers in the Equipment Identity Register (EIR).
IMSI - International Mobile Subscriber Number
When a subscriber registered with a network operator, a unique subscriber IMSI identifier is issued & stored in the SIM (Subscriber Identity Module) of the MS. A MS can only functional fully, if it is operated with a valid SIM inserted into a MS with a valid IMEI.
The total length of the IMSI is 15 digits and it consists of the following elements:
MCC = Mobile Country Code (three digits)
MNC = Mobile Network Code (two digits)
MSIN = Mobile Subscriber Identification Number (ten digits)
TMSI - Temporary Mobile Subscriber Identity
Its used to protect the true identity (IMSI) of a subscriber. It is issued by & stored within a VLR (not in the HLR) when an IMSI attach takes place or a Location Area (LA) updates takes place. The issues TMSI only has validity within a specific LA. The TMSI is used for security purposes, so that the IMSI of a subscriber does not have to be transmitted over the air interface. Its a temporary identity, which regularly gets changed.
MSISDN - Mobile Subscriber International ISDN number
It represents the True or dailed number associated with the subscriber. It is assigned to the subscriber by the network operator at registration & is stored in SIM. Its possible for a MS to hold multiple MSISDNs, each associated with different services. It contains the following elements,
CC= Country code (33=France, 358=Finland, etc.)
NDC= National Destination Code
SN= Subscriber Number
MSRN - Mobile Subscriber Roaming Number
It is temporary, location-dependent ISDN number issued by the parent VLR to all MSs within its area of responsibility. It is stored in VLR & associated HLR but not in the MS. The MSRN is used by VLR associated MSC for call routing within MSC/VLR service area.
CC = Country Code (of the visited country)
NDC = National Destination Code (of the serving network)
SN = Subscriber Number
Each location area within PLMN (Public Landline Mobile Network) has an associated Intenationally unique identifier (LAI). The LAI is broadcasted regularly by the BTSs on the Broadcast Control Channel (BCCH), thus uniquely identify each cell within an associated location area (LA). It structure is as follows,
MCC= Mobile Country Code (of the visited country)
MNC= Mobile Network Code (of the serving PLMN)
LAC= Location Area Code
Its an identifier assigned to each cell within a network. however, CI is only unique within a specific LA. When combined with the internationally unique LAI for its associated LA, the Global Cell Identity (GCI) is produced which is also internationally unique.
BSIC - Base Station Identity Code
Each BTS is issued with a unique identity, the BSIC & is used to distinguish neighbouring BTSs. It is needed to identify that the frequency strength being measured by the mobile station is coming from a particular base station.
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