GSM (GLOBAL SYSTEM FOR MOBILE COMMUNICATION)

GSM TECHNOLOGY

GSM implies worldwide frane work for versatile correspondence. GSM is a global advanced cell telecommunication. The GSM standard was proposed by ETSI (European Telecommunication Standard Institute) in 1989. The primary business administration was launched in 1991. From that point forward GSM has turbed into the most broadly embraced and quickly developing advanced standard, and it is situated to turn into the world's overwhelming cell standard.
Today's third era GSM system convey excellent and secure versatile voice and information administrations with ful abilities over the world. GSM is a massively fruitful engeneering and as uncommon story of worldwide accomplishment. Since the first GSM system was industrially launched, it turns into the world's heading and fastest developing portable standard. The GSM Association evaluates that advabces characterized in the GSM standard serve 80% of the worldwide portable business, including more than 5 billion individuals crosswise over more than 212 nations and domains, making GSM the most omnipresent of the numerous guidelines for cell systems.
Today's GSM stage is living, developing and advancing and as of now offers an extended and characteristic-rich "famiy" of voice and empoewering administrations. The Global System for Mobile Communication (GSM) system is cell telecommunication system with an adaptable structural planning following the ETSI GSM 900/GSM 1800 standard. Siemen's usage is the advanced cell versatile correspondence framework D900/1800/1900 that uses the precise most recent innovation to meet each prerequisite of the standard.

GSM ARCHITECTURE

GSM network consist of mobike station, Base station subsytsem & Network and Operation subsystem
-MS: Mobike Station
-BSS: Base Station Subsystem
-BTS: Base Trancelver Staton
-BSC: Base Station Controller
-MSC: Mobike Service Switching Center
-OMC: Operation and Maintenance Center
-HLR: Home Location Register
-VLR: Visitor Location Register
-EIR: Equipment Identity Register
-AUC: Authentication Center

GSM INTERFACES

-Air interface between Mobile Station & BTS

-Abis interface between BTS & BSC

-A interface between BSC & MSC

-SS7 interface between MSC & PSTN

GSM SYSTEM SPECIFICATION

-Acess Method- TDMA/FDMA

-Uplink frequency band- 890 to 915 MHz

-Downlink frequency band- 935 to 960 MHz

-System Bandwidth- 200 KHz

-Number of frequency channels or ARFCN (Absolute Radio Frequency Channel Number)- 124 users per channel- 8