02-03-2011, 03:15 PM
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GSM ARCHITECTURE
A GSM system is basically designed as a combination of three major subsystems: the network subsystem, the radio subsystem, and the operation support subsystem. In order to ensure that network operators will have several sources of cellular infrastructure equipment, GSM decided to specify not only the air interface, but also the main interfaces that identify different parts. There are three dominant interfaces, namely, an interface between MSC and base transceiver station, and an Um interface between the BTS and MS.
GSM Network Structure
Every telephone network need a well designed structure in order to route the incoming call to the correct exchange and finally to the called subscriber. In a mobile network this structure is of great importance because of the mobility of all its subscribers. In the GSM system the network is divided in to the following partitioned areas.
• GSM service area
• PLMN service area
• MSC service area
• Location area
• Cells
The Mobile Station is carried by the subscriber; the Base Station Subsystem controls the radio page link with the Mobile Station. The Network Subsystem, the main part of which is the Mobile services Switching Center, performs the switching of calls between the mobile and other fixed or mobile network users, as well as management of mobile services, such as authentication. Not shown is the Operations and Maintenance center, which oversees the proper operation and setup of the network. The Mobile Station and the Base Station Subsystem communicate across the Um interface, also known as the air interface or radio link. The Base Station Subsystem communicates with the Mobile service Switching Center across the A interface.
GSM ARCHITECTURE
A GSM system is basically designed as a combination of three major subsystems: the network subsystem, the radio subsystem, and the operation support subsystem. In order to ensure that network operators will have several sources of cellular infrastructure equipment, GSM decided to specify not only the air interface, but also the main interfaces that identify different parts. There are three dominant interfaces, namely, an interface between MSC and base transceiver station, and an Um interface between the BTS and MS.
GSM Network Structure
Every telephone network need a well designed structure in order to route the incoming call to the correct exchange and finally to the called subscriber. In a mobile network this structure is of great importance because of the mobility of all its subscribers. In the GSM system the network is divided in to the following partitioned areas.
• GSM service area
• PLMN service area
• MSC service area
• Location area
• Cells
The Mobile Station is carried by the subscriber; the Base Station Subsystem controls the radio page link with the Mobile Station. The Network Subsystem, the main part of which is the Mobile services Switching Center, performs the switching of calls between the mobile and other fixed or mobile network users, as well as management of mobile services, such as authentication. Not shown is the Operations and Maintenance center, which oversees the proper operation and setup of the network. The Mobile Station and the Base Station Subsystem communicate across the Um interface, also known as the air interface or radio link. The Base Station Subsystem communicates with the Mobile service Switching Center across the A interface.
