4 gsm net architecture by Praveen Kumar Prabhat

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4 gsm net architecture by Praveen Kumar Prabhat

  1. 1. GSM Network Architecture ELET 6302
  2. 2. Motivation
  3. 3. OutlineIntroduction and history.GSM architecture.Implementation.Technology and standards.Summary
  4. 4. 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
  5. 5. 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
  6. 6. 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
  7. 7. 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/
  8. 8. 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
  9. 9. 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
  10. 10. 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
  11. 11. SummaryNetwork architectureImplementationVoice applicationData application
  12. 12. 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.

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