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GSM Networks: Protocols, Terminology, and Implementation
2.2.2 Functionality 17
2.2.3 Mobile Stations as Test Equipment 18
3 The Base Station Subsystem_19
3.1 Base Transceiver Station 19
3.1.1 Architecture and Functionality of a Base Transceiver
Station 20
3.1.2 Base Transceiver Station Configurations 22
3.2 Base Station Controller 25
3.2.1 Architecture and Tasks of the Base Station
Controller 26
3.3 Transcoding Ratę and Adaptation Unit 28
3.3.1 Function of the Transcoding Ratę and
Adaptation Unit 28
3.3.2 Site Selection for Transcoding Ratę and
Adaptation Unit 28
3.3.3 Relationship Between the Transcoding Ratę,
Adaptation Unit, and Base Station Subsystem 29
4 The NetWork Switching Subsystem_31
4.1 Home Location Register and Authentication
Center 32
4.2 Visitor Location Register 33
4.3 The Mobile-Services Switching Center 34
4.3.1 Gateway MSC 36
4.3.2 The Relationship Between MSC and VLR 36
4.4 Equipment Identity Register 37
5 The OSI Reference Model_39
5.1 Reasons for Standardization 39
5.2 Layering in the OSI Reference Model 40
5.3 Data Types of the OSI Reference Model 41
5.4 Information Processing in the OSI Reference
Model 42
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