Gsm Architecture
INDEX
1. GSM Architecture……………………………………………… 2 2. The Cellular System ....…………………………………………. 7 3. Air Interface ...………………………………………………….. 10 4. Signaling Concepts…..…………………………………………. 17 5. Functions And Services of GSM ………….…………………… 30 6. Frequency Hopping……..…………………………………….. 39 7. GSM Identities……..………………………………………….. . 45 8. Traffic Cases……………………………………………………. 50 9. The GSM Transmission Process………………………………. 65
10. E1……………………………………………………………… 70
11. Transmission...…………………………………………………. 80
CHAPTER-1
GSM ARCHITECTURE
1.1 INTRODUCTION
Global system for mobile communication (GSM) is a globally accepted standard for digital cellular communication. GSM is the name of a standardization group established in 1982 to create a common European mobile telephone standard that would formulate specifications for a pan-European mobile cellular radio system operating at 900 MHz.
The standardized system met certain favorable criterion: * Spectrum efficiency * International roaming * Low mobile and base stations costs * Good subjective voice quality * Compatibility with other systems such as ISDN (Integrated Services Digital Network) * Ability to support new services * Distinction between user and device identification * Extensive security features
1.2 GSM NETWORK ELEMENTS * THE SWITCHING SYSTEM The switching system (SS) is responsible for performing call processing subscriber related functions. The switching system includes the following functional units. * HOME LOCATION REGISTER (HLR)
The HLR is a centralized network database that stores and manages all mobile subscriptions belonging to a specific operator. It acts as a permanent store for a person’s subscription information until that subscription is cancelled. The information stored includes: * Subscriber identity * Subscriber supplementary services * Subscriber location information * Subscriber authentication information
The HLR can
1. GSM Architecture……………………………………………… 2 2. The Cellular System ....…………………………………………. 7 3. Air Interface ...………………………………………………….. 10 4. Signaling Concepts…..…………………………………………. 17 5. Functions And Services of GSM ………….…………………… 30 6. Frequency Hopping……..…………………………………….. 39 7. GSM Identities……..………………………………………….. . 45 8. Traffic Cases……………………………………………………. 50 9. The GSM Transmission Process………………………………. 65
10. E1……………………………………………………………… 70
11. Transmission...…………………………………………………. 80
CHAPTER-1
GSM ARCHITECTURE
1.1 INTRODUCTION
Global system for mobile communication (GSM) is a globally accepted standard for digital cellular communication. GSM is the name of a standardization group established in 1982 to create a common European mobile telephone standard that would formulate specifications for a pan-European mobile cellular radio system operating at 900 MHz.
The standardized system met certain favorable criterion: * Spectrum efficiency * International roaming * Low mobile and base stations costs * Good subjective voice quality * Compatibility with other systems such as ISDN (Integrated Services Digital Network) * Ability to support new services * Distinction between user and device identification * Extensive security features
1.2 GSM NETWORK ELEMENTS * THE SWITCHING SYSTEM The switching system (SS) is responsible for performing call processing subscriber related functions. The switching system includes the following functional units. * HOME LOCATION REGISTER (HLR)
The HLR is a centralized network database that stores and manages all mobile subscriptions belonging to a specific operator. It acts as a permanent store for a person’s subscription information until that subscription is cancelled. The information stored includes: * Subscriber identity * Subscriber supplementary services * Subscriber location information * Subscriber authentication information
The HLR can