BLOCK DIAGRAM OF GSM
Mobile Station (MS). The GSM mobile stations are portable radiotelephonyunits that can be used on any GSM system as vehicular and/or handheld
terminals.
Base
Station System (BSS). The base
station system comprises
a base station controller (BSC) and one or more subtending base
transceiver stations (BTS)
a base station controller (BSC) and one or more subtending base
transceiver stations (BTS)
Mobile
Switching Center (MSC).
The mobile switching center
for GSM can be viewed as a local ISDN switch with additional capabilities to
support mobility management functions like terminal registration, location
updating, and handoff.
for GSM can be viewed as a local ISDN switch with additional capabilities to
support mobility management functions like terminal registration, location
updating, and handoff.
Home
Location Register (HLR).
The HLR represents a centralized
database that has the permanent datafill about the mobile subscribers
in a large service area (generally one per GSM network operator).
database that has the permanent datafill about the mobile subscribers
in a large service area (generally one per GSM network operator).
Visiting Location
Register (VLR). The VLR represents a
temporary data store, and generally there is one VLR per MSC. This register
contains information about the mobile subscribers who are currently in the
service area covered by the MSC/VLR.
temporary data store, and generally there is one VLR per MSC. This register
contains information about the mobile subscribers who are currently in the
service area covered by the MSC/VLR.
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