Ch2 gsm network architecture

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Ch2 gsm network architecture

  1. 1. GSM NETWORK ARCHITECTURE
  2. 2. GSM NETWORK ARCHITECTURE • GSM NETWORK ARCHITECTURE
  3. 3. GSM NETWORK ARCHITECTURE
  4. 4. GSM NETWORK ARCHITECTURE -The Mobile station (MS) Modes of MS attached detached IMSI de. Implicit de.ideal active registration LA paging roaming Ongoing call HO Monitoring power of neighboring BTSs Monitoring power & quality of its BTS
  5. 5. Types of MSs Vehicle mounted MS  Mounted to dashboard of vehicle.  Antenna mounted on outside.  More powerful. Transportable MS  Can be handheld.  Antenna is not connected to handset. Handheld MS  Hand carried  Antenna connected to handset.  Pocket-sized.  Can be vehicle mounted. GSM NETWORK ARCHITECTURE
  6. 6. GSM NETWORK ARCHITECTURE -The Mobile station (MS) 1- Mobile equipment (ME) it is the terminal used by user Can be purchased from any store Without SIM no calls can be made It has an International Mobile Equipment Identity (IMEI)
  7. 7. IDENTITY NUMBERS
  8. 8. GSM NETWORK ARCHITECTURE 2- Subscriber identity module (SIM) An electronic microchip for storing information
  9. 9. GSM NETWORK ARCHITECTURE 2- Subscriber identity module (SIM)
  10. 10. GSM NETWORK ARCHITECTURE 2- Subscriber identity module (SIM)
  11. 11. IDENTITY NUMBERS
  12. 12. IDENTITY NUMBERS
  13. 13. IDENTITY NUMBERS
  14. 14. IDENTITY NUMBERS
  15. 15. IDENTITY NUMBERS
  16. 16. GSM NETWORK ARCHITECTURE -The base station subsystem (BSS) 1- The Base Transceiver station (BTS) it contains the RF transmission equipment Each cell has one BTS Each BTS consists of one or more transceiver It has an International cell global Identity (CGI) It performs channel coding, ciphering and modulation
  17. 17.  Base Transceiver station GSM NETWORK ARCHITECTURE
  18. 18.  Base Transceiver station GSM NETWORK ARCHITECTURE
  19. 19.  Base Transceiver station GSM NETWORK ARCHITECTURE
  20. 20.  Base Transceiver station GSM NETWORK ARCHITECTURE
  21. 21.  Base Transceiver station GSM NETWORK ARCHITECTURE
  22. 22.  Base Transceiver station GSM NETWORK ARCHITECTURE
  23. 23.  Base Transceiver station GSM NETWORK ARCHITECTURE
  24. 24. GSM NETWORK ARCHITECTURE 2- The base station controller (BSC) -It carries out all control functions in the BSS as: 1. Paging 2. Channel allocation 3. Dynamic power control 4. Handover 5. Frequency hopping
  25. 25. The base station controller (BSC)
  26. 26. BTS GSM NETWORK ARCHITECTURE The base station controller (BSC) BSC BTS Remote BTS Co-located BTS
  27. 27. BSS Link configuration GSM NETWORK ARCHITECTURE BTS BSC BTS BTS BTS BTS - Cascade
  28. 28. BTS BSS Link configuration GSM NETWORK ARCHITECTURE BSC BTS BTS BTS - loop
  29. 29. BSS Link configuration GSM NETWORK ARCHITECTURE BTS BSC BTS BTS BTS BTS - Star
  30. 30. GSM NETWORK ARCHITECTURE 3- The transcoding and rate adaptation unit (TRAU) - It is used for speech compression/decompression - Also adaptation of data to the requirement of the air interface MSC VLRBSC 16 16 16 16 64 64 64 6416 16 16 16 13 TRAU
  31. 31.  Transcoding and rate adaptation unit
  32. 32. GSM NETWORK ARCHITECTURE - The Mobile service switching center (MSC) -It is an electronic computerized exchange provides the interface between MS and the fixed network -It will not contain any subscriber parameters 1. Charging 2. Switching and call routing 3. Communication with HLR and VLR 4. Communication with other MSCs 5. Control of connected BSCs
  33. 33. Mobile Services Switching Centre
  34. 34. GSM NETWORK ARCHITECTURE - The MSC is connected to: 1. HLR (Home location register) 2. VLR (Visitor location register) 3. AUC (Authentication Center) 4. EIR (Equipment identity register)
  35. 35. GSM NETWORK ARCHITECTURE 1. HLR (Home location register) - The centralized database that stores and manages all mobile subscription parameters - HLR contains :  Subscriber identification numbers (IMSI,MSISDN)  Subscriber current location information (MSC/VLR)  Subscriber authentication information  Charging  Subscriber type
  36. 36. GSM NETWORK ARCHITECTURE 1. HLR (Home location register)
  37. 37. GSM NETWORK ARCHITECTURE 2. VLR (Visitor location register) - A temporary storage location for subscription information for MSs which are within MSC service area - VLR contains :  Mobile status (free, busy,…etc)  Temporary MS identity (TMSI)  Temporary MS roaming number (MSRN)  Supplementary service information
  38. 38. GSM NETWORK ARCHITECTURE 3. Authentication - It is a processor system that performs the authentication function AUC RAND Database IMSI,Ki A8A3 RAND SRES Kc Triplet Ki IMSI Triplet Request for Triplet from HLR,VLR
  39. 39. GSM NETWORK ARCHITECTURE 3. Authentication
  40. 40. GSM NETWORK ARCHITECTURE 4. EIR (Equipment identity register) - As the subscriber and equipment are separate in GSM so we use a separate authentication process for MS equipment - EIR is a centralized database for validation of international mobile equipment identity (IMEI) - EIR contains 3 lists:  White list (for valid MS equipment)  Black list (for stolen or denied service MS)  Gray list (for mal-performance MS [e.g. faulty software] ) EIR Black list White list Gray list
  41. 41. GSM NETWORK ARCHITECTURE 3-The Operation and maintenance center (OMC):- A-The Operation and Maintenance Center for Radio part (BSS) (OMC-R) B-The Operation and Maintenance Center for switching parts (OMC-S)
  42. 42. GSM NETWORK ARCHITECTURE The Operation and maintenance center (OMC)
  43. 43. GSM NETWORK ARCHITECTURE - Geographic network areas
  44. 44. GSM NETWORK ARCHITECTURE
  45. 45. GSM NETWORK ARCHITECTURE
  46. 46. GSM NETWORK ARCHITECTURE
  47. 47. GSM NETWORK ARCHITECTURE - Cell

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