4 gsm net architecture by Praveen Kumar Prabhat
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4 gsm net architecture by Praveen Kumar Prabhat






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4 gsm net architecture by Praveen Kumar Prabhat 4 gsm net architecture by Praveen Kumar Prabhat Presentation Transcript

  • GSM Network Architecture ELET 6302
  • Motivation
  • OutlineIntroduction and history.GSM architecture.Implementation.Technology and standards.Summary
  • IntroductionGlobal System for Mobile Communication (GSM) Anybody – 500 million users (may 2001) Anywhere – 168 countries (may 2001) Any media – voice, messaging, data, multimedia Source: Hillebrand, 1
  • GSM Architecture Home Location Register Network ManagementBTS = Base Transceiver Station Center AuCAuC = Authentication Center Equipment IDOMC = Operation and Maintenance CenterPSTN = Public Switched Telephone NetworkME = Mobile Equipment Visitor Location OMC RegisterSubscriber BIdentity ME T Mobile S DataModule switching communication center networkSubscriber B Base stationIdentity ME TModule S controllerSubscriber BIdentity ME T PSTN SModule Source: Stallings, 313 Source: Mehrotra, 27
  • GSM ArchitectureMS Transmission BS TransmissionBand : 890 – 915 Band : 935 – 960MHZ MHZ 45 MHz Year Introduced 1990 1 Access method TDMA 2 3 Channel Bandwidth 200 kHz 4 5 Number of duplex 125 6 channels 7F1 F2 F1 F2 8 Users per channel 8 Frequency Speech coding bit 13 kbps rate Data coding bit rate 12 kbps Frame size 4.6 ms
  • SIM (Subscriber Identity Module) Billions of Calls Millions of SubscribersThousand of Different Types of Telephones Hundreds of Countries Dozens of Manufacturers…. •Administrative data And only one Card: The SIM •Security data •Subscriber data •Roaming data •PLMN (Public Land Mobile Network Source: Hillebrand, 369 http://ucables.com/products/simcards/
  • Implementation Receiver >Channel Decoding Voice decoding >De-Interleaving Deciphering Demodulation >Re-formatting >Channel encoding >Interleaving Voice encoding Ciphering Modulation Amplifier >Burst generation TransmitterCentral processor, clock and tone, internal bus system, keyboard(HMI) SIM = Subscriber Identity Module Source: Heine, 14
  • Implementation Slow frequency HF Transmitter TransmissionOutput filter TRX Abis- (HF-TX) Interface system hopping Digital signal HF Receiver processing (NF Input filter (HF-RX) functionality) O&M Module Operation and maintenance functionality/clock distribution Block Diagram of a BTS with one TRX Source: Heine, 20
  • GSM VariantsVariant Uplink Downlink Total Duplex- Channels (MHz) (MHz) Bandwidth frequencyGSM-400 451-458 and 461-468 and Twice 14 MHz 10 MHz Twice 72 479-486 489-496GSM-900 890-915 935-960 Twice 25 MHz 45 MHz Twice 124(primaryband)Extended 880-915 925-960 Twice 35 MHz 45 MHz Twice 174GSM-900GSM-R 876-880 921-925 Twice 4 MHz 45 MHz Twice 19DCS-1800 1,710-1,785 1,805-1,880 Twice 75 MHz 95 MHz Twice 373PCS-1900 1,850-1,910 1,930-1,990 Twice 60 MHz 80 MHz Twice 300 Source: Bekkers, 299
  • SummaryNetwork architectureImplementationVoice applicationData application
  • ReferencesBekkers, Rudi. Mobile Communications Standards: GSM, UMTS, TETRA, and ERMES. Norwood, MA: Artech House, Inc., 2001.Halonen, Romero, and Melero. GSM, GPRS, and EDGE Performance: Evolution Towards 3G/UMTS. England: John Wiley & Sons Ltd., 2003.Hillebrand, Friedhelm. GSM and UMTS: The Creation of Global Mobile Communications. England: John Wiley & Sons Ltd., 2002.Heine, Gunnar. GSM Networks: Protocols, Terminology, and Implementation. Norwood, MA: Artech House, Inc., 1999.Mehrotra, Asha. GSM System Engineering. Norwood, MA: Artech House, Inc., 1997.Harte, Levine, and Livingston. GSM Superphones. United States: APDG Publishing, Inc. A Division of McGraw-Hill, 1999.