Gsm  Global System For Mobile Comm[1].   Really Nice
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    Gsm  Global System For Mobile Comm[1].   Really Nice Gsm Global System For Mobile Comm[1]. Really Nice Presentation Transcript

    • INTRODUCTION TO CELLULAR TECHNOLOGY GSM-GLOBAL SYSTEM FOR MOBILE COMMUNICATION RAHUL GUPTA
    • TRAINING CARRIED AT
    • MOBILTY THE MAGIC WORD
      • IN THIS DAY & AGE ,MANY FOLKS NEED TO BE ACCESSIBLE EVERYWHERE ,WHETHER THEY’RE AT WORK OR PLAY,IN THE OFFICE OR AT HOME .
              • WHAT IS NEEDED FOR MEETING THIS DEMAND?
    • GSM: GLOBAL SYSTEM FOR MOBILE COMMUNICATION
      • DEFINITION
      • 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 .it is estimated that many countries outside of Europe will join the GSM partnership.
    • EVOLUTION OF MOBILE TELEPHONE SYSTEMS
    • PCS-United States 1996 CDMA 1995 GPRS 2003 PCS-1900 1995 Personal digital cellular 1994 Digital cellular system 1992 GSM 1991 American digital cellular 1991 Nordic mobile technology 1986 Total access communication system 1985 American mobile telephone system 1983 Nordic mobile telephone 1981 MOBILE SYSTEM YEAR
    • GSM-NETWORK ARCHITECTURE Mobile station
    • Mobile station
      • Handset /mobile/portable terminal/mobile equipment
      • Includes
        • Subscriber identification module (SIM)
            • IMSI
            • (INTERNATIONAL MOBILE SUBSCRIBER IDENTITY)
            • MSISDN
        • International mobile equipment identity (IMEI)
    • Base station subsystem(BSS)
      • Includes
        • Base transceiver station(BTS)
            • Connect mobile to cellular network
            • Channel codingdecoding
            • Encryptiondecryption
            • Radio transmitters eceivers
            • antennas
        • Base station controller(BSC)
            • Group of BTS’s are connected to a BSC
            • Call maintenance
            • Report every 480 ms by MS
    • Network & switching subsystem(SS)
      • Includes
        • Mobile switching center(MSC)
            • Act like a fixed exchange
            • Provide all functionality for mobile subscriber
            • Registration
            • Location updating
            • Handoverscall routing
            • GMSC
        • Home location register(HLR)
            • IMSI
            • MSISDN
            • Current VLR address
      • - Visitor location register(VLR)
            • Current location of the mobile station
            • Connected to one MSC
            • Integrated into MSC’s hardware
        • Authentication center(AuC)
            • Hold secret key
            • Located close to each HLR
        • Equipment identity register(EIR)
            • List of valid mobile station(IMEI)
            • Three databases
              • White list
              • Black list
              • Grey list
    • INTERFACES & PROTOCOLS
      • OSI layer structure
        • PHYSICAL LAYER
            • Enable physical transmission
            • Assessment of channel quality
            • DATA LINK LAYER
            • Multiplexing of the signal channels
            • Error detection
            • Flow control
            • Routing
            • NETWORK LAYER
            • Connection management
            • Management of location data
            • Subscriber identification
    • OSI ARCHITECTURE PSTN PSPDN ISDN Um Abis A MS BTS BSC MSC
    • The air interface Um
      • OSI layer structure
        • PHYSICAL LAYER
            • Enable physical transmission
            • Assessment of channel quality
            • DATA LINK LAYER
            • Multiplexing of the signal channels
            • Error detection
            • Flow control
            • Routing
            • NETWORK LAYER
            • Connection management
            • Management of location data
            • Subscriber identification
      ITU (international telecommunication union) has allocated following bands: GSM 900: uplink : 890-915 MHz downlink:935-960 MHz GSM 1800: uplink : 1710-1785 MHz downlink:1805-1880 MHz * TDMAFDMA scheme * BURST – fundamental unit in the TDMA scheme
    • Protocols on the air interface
      • Layer 1: Um interface
      • Layer 2: LAP-Dm protocol
      • Layer 3: Radio Resource Management (RR): to establish and release stable connection between mobile stations (MS) and MSC for the duration of a call      
      •     - Cell selection,
      •               - Handover,
      •               - Monitoring and forwarding of radio connections,
      •               - Introduction of encryption,
      •              Mobility management (MM) handles control functions for mobility
      •             - Authentication,
      •              - Assignment of TMSI,
      •               - Management of subscriber location.
      •      Connection management (CM) set up, maintain calls -   connections             - Call control (CC): Manages call connections,
      •               - Supplementary service support (SS): special services,
      •                - Short message service support (SMS): Transfers brief texts.
    • System features
      • Cell architecture
      • Handover
      • Security
        • Users identity& authentication
        • Mobile security
    • CELL ARCHITECTURE
    • Handover
    • User identity & authentication
    • GSM-subscriber services
    • GSM –SUBSCRIBER SERVICES
      • Telephony services(teleservices )
      • These are mainly voice services that provide subscriber with the complete capability(including necessary terminal equipment) to communicate with other subscribers.
      • Data services(bearer services)
      • These provides the capacity necessary to transmit appropriate data signals between two access points creating an interface to the network .
      • Subscriber services
      • - Facsimile group
      • -SMS
      • -Cell broadcast
      • -Voice mail
      • -Fax mail
      • Supplementry services
      • - Call forwarding
      • -Baring of outgoing calls
      • -Baring of incoming calls
      • -Call hold
      • -Call waiting
      • -Calling line identification presentation
    • GSM V/S CDMA 127 MILLION USERS 456 MILLION USERS INTERNATIONAL ROAMING 64-140kbps 56 kbps DATA RATE SOFT MAKE BEFORE BREAK HARD BREAK BEFORE MAKE HANDOVER SPREAD SPECTRUM TECHNOLOGY FDMA TDMA TECHNOLOGY USED CDMA GSM PARAMETERS
      • THE ONLY WAY TO KNOW AN ANSWER IS TO QUESTION FIRST
      • ?
    • THANK YOU