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Gprs architecture ppt

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Gprs architecture ppt

  1. 1. Prepared by: Arpita Sanghani 14PGIT020 M.Tech-IT 2nd sem
  2. 2. Content  What is GPRS?  Characteristics of GPRS  GPRS Architecture  Support nodes of GPRS  Network Enhancements  GPRS interface  Security
  3. 3. What is GPRS General Packet Radio Service • General -> not restricted to GSM use (DECT ?, 3rd generation systems ?) • Packet Radio -> enables packet mode communication over air • Service, not System -> existing BSS (partially also NSS) infrastructure is used Main benefits • Resources are reserved only when needed and charged accordingly • Connection setup times are reduced • Enables new service opportunities
  4. 4. GPRS Characteristics GPRS uses packet switched resource allocation • resources allocated only when data is to be sent/received Flexible channel allocation • one to eight time slots • available resources shared by active users • up and down link channels reserved separately • GPRS and circuit switched GSM services can use same time slots alternatively Traffic characteristics suitable for GPRS • Intermittent, bursty data transmissions • Frequent transmissions of small volumes of data • Infrequent transmission of larger volumes of data
  5. 5. GPRS Architecture
  6. 6. 4 GATEWAYSUB SYSTEM 3 RADIO SUB SYSTEM 2 NETWORK SUBSYSTEM 1 BASE STATION SUB SYSTEM BTS 1 BTS 2 BSC 1 BSC 2 MSC VLR SGSN TO A NO OF BSC EIR HLR MS 1 MS 2
  7. 7. GPRS Architecture..  Uses gsm architecture+ gsn(gprs support nodes) Sgsn (servicing gsn) Ggsn ( gateway gsn)  Uses packet switching  Faster than gsm and cdma  Enable simultaneous transmission of packets  SGSN and GGSN will be explain in next slide
  8. 8. GPRS support nodes  There are two network nodes use to offer packet data service called GPRS support nodes 1) Serving GPRS Support Node (SGSN) 2) Gateway GPRS Support Node (GGSN)
  9. 9. Serving GPRS Support Node(SGSN) Serving GPRS Support Node(SGSN) is one of the GPRS support node  Routing the packet switched data to and from the ms  Mobility management  Location management  Authentication and charging for calls  Stores the location information of the user  User’s profile
  10. 10. Gateway GPRS Support Node(GGSN)  Provide a gateway b/w gprs & pdn  Convert data from sgsn to pdp format( packet data protocol)  Store the current sgsn address  Stores the location of user in its location register  Perform authentication & charging functions
  11. 11. HAVING 4 SUBSYSTEMS GPRS BSS NSS RSS GSS
  12. 12. Base Station System(BSS)  BSS system needs to enhancement to recognize and send packet data.  BSS includes BTS and MS. Network Subsystem(NSS)  It consist of a number of sgsns  Also consist of a number of msc  helps in – authentication, operation & maintenance of subsystems
  13. 13. SIM ME BTS BTS BSC BSC HLR HLR HLR HLR MSC SGSN GGSN PSTN, ISDN, PSPDN CSPD N BSS NSS
  14. 14. RADIO STATION SUBSYSTEM  Consist of a number of ms, bts & bsc’s  Ms having gprs capability  Stores a cksn( cipher key sequence number – a logical identity) GATEWAY SUBSYSTEM  Consist of sgsn & ggsn  Provide connections to other networks & pda  Pda – public data network
  15. 15. GPRS other components  Home Location Register(HLR): registers user profile and responds to queries from GSNs .  Mobile Station(MS): it is the mobile phone or device  SMS Nodes: used for sms transmission via the SGSN
  16. 16. Acronyms  GPRS – GENERAL PACKET RADIO SERVICE  MS – MOBILE STATION  BTS – BASE TRANCEIVER STATION  BSC – BASE STATION CONTROLLER  MSC – MOBILE SERVICES SWITCHING CENTER  HLR – HOME LOCATION REGISTER  AUC – AUTHENTICATION CENTER  EIR – EQUIPMENT IDENTITY REGISTER  VLR – VISITOR LOCATION REGISTER
  17. 17. Conclusion  GPRS provides efficient access to Packet Data Networks.  Multislot operation in GPRS leads to efficient channel utilization.  GPRS is more effective for long data packet transmission than short ones.
  18. 18. References  Mobile Computing by Ashoke k Talukder  http://www.tutorialspoint.com/gprs/gprs_architectur e.html  Mobile Communications by Jochen Schiller

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