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GSM Network Architecture

GSM Network Architecture. ELET 6302. Motivation. Outline. Introduction and history. GSM architecture. Implementation. Technology and standards. Summary. Introduction. Global System for Mobile Communication (GSM) Anybody – 500 million users (may 2001) Anywhere – 168 countries (may 2001)

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GSM Network Architecture

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  1. GSM Network Architecture ELET 6302

  2. Motivation

  3. Outline • Introduction and history. • GSM architecture. • Implementation. • Technology and standards. • Summary

  4. Introduction • Global 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. GSM Architecture Network Management Center Home Location Register BTS = Base Transceiver Station AuC = Authentication Center OMC = Operation and Maintenance Center PSTN = Public Switched Telephone Network ME = Mobile Equipment AuC Equipment ID OMC Visitor Location Register Subscriber Identity Module BTS Mobile switching center ME Data communication network Subscriber Identity Module Base station controller BTS ME Subscriber Identity Module BTS ME PSTN Source: Stallings, 313 Source: Mehrotra, 27

  6. GSM Architecture MS Transmission Band : 890 – 915 MHZ BS Transmission Band : 935 – 960 MHZ 45 MHz

  7. SIM (Subscriber Identity Module) Billions of Calls Millions of Subscribers Thousand of Different Types of Telephones Hundreds of Countries Dozens of Manufacturers…. And only one Card: The SIM • Administrative data • Security data • Subscriber data • Roaming data • PLMN (Public Land Mobile Network Source: Hillebrand, 369 http://ucables.com/products/simcards/

  8. Implementation Receiver >Channel Decoding >De-Interleaving >Re-formatting Voice decoding Deciphering Demodulation >Channel encoding >Interleaving >Burst generation Voice encoding Ciphering Modulation Amplifier Transmitter Central processor, clock and tone, internal bus system, keyboard (HMI) SIM = Subscriber Identity Module Source: Heine, 14

  9. Implementation HF Transmitter (HF-TX) Output filter TRX Abis-Interface Transmission system Slow frequency hopping Digital signal processing (NF functionality) HF Receiver (HF-RX) Input filter O&M Module Operation and maintenance functionality/clock distribution Block Diagram of a BTS with one TRX Source: Heine, 20

  10. GSM Variants Source: Bekkers, 299

  11. Summary • Network architecture • Implementation • Voice application • Data application

  12. References Bekkers, 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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