Intro to gsm

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Intro to gsm

  1. 1. Introduction To GSM Network Design - Shaun Roberts
  2. 2. What is GSM? • Global System for Mobile Communications • Standard for Second Generation Cellular Networks • Introduced in 1990 by European Telecommunications Stanards Institue • By 2009 GSM technologies accounted for 3.38 billion subscribers globally and 83.5 percent of the mobile market share.
  3. 3. Overview • 850Mhz, 950Mhz, 1800Mhz, and 1900Mhz • Conceived for full duplex voice telephony, the design of the network was circuit switched. • General Packet Radio Services added packet switching for data services such as text and internet usage.
  4. 4. Mobile Stations • Most familiar component • SIM holds International Mobile Subscriber ID, Auth. Key, User Contacts etc. • Mobile Device + SIM = Mobile Station Keyboard Control Display Transmit Audio Signal Processing Receive Audio Signal Processing Channel Decoding Deinterleaving Message Regenerator Channel Encoding Interleaving Message Generator Ciphering Ciphering RF Processing RF Processing SIM Duplexer Antenna ANTENNA ASSEMBLY TRANSMITTER RECEIVER TRANSCEIVER UNIT CONTROL SECTION
  5. 5. Multiple Access • Frequency Division Multiple Access • Radio Bands split into Frequency Channels
  6. 6. Multiple Access (cont.) • Time Division Multiple Access • Splits each Frequency Channel Into 8 Timeslots
  7. 7. BSS – Base Station Subsystem • Large number of Base Transceiver Stations connected to Base Station Controllers • Connect Mobile Station to Network
  8. 8. BTS – Base Transeiver Station • Controls Transceivers and Antennas • Each BTS can have 16 TX/RX • 8 Users per TX/RX
  9. 9. BSC – Base Station Controller • Manages multiple BTS’s • Essentially small exchange
  10. 10. NSS – Network and Switching Subsystem • Mobile Switching Centers and Subscriber Databases • Manages communication and services
  11. 11. MSC – Mobile services Switching Center • Switches Calls • Provides connection to other networks • Processing of service features
  12. 12. HLR/VLR/AuC • Home Location Register • Visitor Location Register • Authentication Center
  13. 13. GPRS Core Network • Added packet switching to GSM • Packet Control Unit, Serving GPRS Support Node, Gateway GPRS Support Node
  14. 14. SGSN – Serving GRPS Support Node GGSN – Gateway GRPS Support Node
  15. 15. Sources • Eberspacher, J; Bettstetter, Christian; Vogel, Hans-Joerg; Hartmann, Christian. (2009). GSM - Architecture, Protocols and Services. Wiley. Heine, Gunnar. (2003). GPRS : Gateway to Third Generation Mobile Networks (Second Edition). Artech House. • ETSI TS 100 910 V8.20.0 Technical Specification

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