GSM fundamentals

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GSM fundamentals

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GSM fundamentals

  1. 1. GSM Fundamental Presented by Tushar Bhanarkar third Year Electronics & Telecommunication Engineering
  2. 2. Agenda     Network Architecture Frequency Resource Network Planning Channel Type
  3. 3. GSM Network Structure OMC MSC/VLR BSC E BIE BTS A Abi s PSTN ISDN PSPDN MSC/VLR BSS C Um MS HLR/ AUC F H EIR SC/VM MSS 3
  4. 4. Mobile Station ( MS ) Equipment used by mobile service subscribers for access to services. Mobile Equipment Subscriber Identity Module (SIM) Mobile stations are not fixed to one subscriber. A subscriber is identified with the SIM card. 4
  5. 5. GSM Network Entity Base Transceiver Station ( BTS ) Base Transceiver Station (BTS) Wireless transmission Wireless diversity Wireless channel encryption Conversion between wired and wireless signals Frequency Hopping 5 BaseBand Unit: voice and data speed adapting and channel coding RF Unit: modulating/demodulating, transmitter and receiver Common Control Unit: BTS operation and maintenance
  6. 6. GSM Network Entity Base Station Controller ( BSC ) Managing Wireless network-BSS Monitoring BTS Controls: Wireless link distribution between MS and BTS Communication connection and disconnection MS location, handover and paging Voice encoding, transecoding (TC), rate, adaptation, The operation and maintenance functions of BSS.
  7. 7. GSM Network Entity Mobile Service Switching Center ( MSC ) holds all the switching functions manages the necessary radio resources, updating the location registration carrying out the inter-BSC and inter-MSC tender Inter-working with other networks (IWF).
  8. 8. GSM Network Entity Home Location Register ( HLR ) Manages the mobile subscribers database  subscriber information  part of the mobile location information  3 identities essential the International Mobile subscriber Identity the Mobile station ISDN Number the VLR address
  9. 9. GSM Network Entity Visitor Location Register ( VLR ) dynamically stores subscriber information needed to handle incoming/outgoing calls Mobile Station Roaming Number When a roaming mobile enters an MSC area. This MSC warns the associated VLR of this situation; the mobile enters a registration procedure through which it is assigned a mobile subscriber roaming number (MSRN) Temporary Mobile Subscriber Identity, if applicable The location area in which the mobile has been registered Data related to supplementary service parameters
  10. 10. GSM Network Entity AUC/EIR Authentication Center(s) (AUC) Providing the authentication key used for authorizing the subscriber access to the associated GSM PLMN. Equipment Identity Register(s) (EIR) Handling Mobile Station Equipment Identity
  11. 11. Frequency Resource GSM900 : up: 890~915MHz down: 935~960MHz duplex interval: 45MHz bandwidth: 25MHz, frequency interval: 200KHz GSM1800 : up: 1710-1785MHz down: 1805-1880MHz duplex interval: 95MHz, working bandwidth: 75MHz, frequency interval: 200KHz EGSM900 : up: 880~890MHz down: 925~935MHz duplex interval: 45MHz bandwidth: 10MHz, frequency interval: 200KHz GSM1900MHz: up:1850~1910MHz down:1930~1990MHz duplex interval: 80MHz, working bandwidth: 60MHz, frequency interval: 200KHz
  12. 12. Frequency Resource Single Band Network Single Band 900MHz Dual Band 1800MHz Triple Band 1900MHz In a sense, the network determines the handsets can be selected. But nowadays, most handsets support dual band.
  13. 13. Channel Type Traffic Channel Transmit voice and data Signaling Channel transmit the signaling and synchronous data between BTS and MS.

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