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MOBLIE PHONE NETWORKS Dr. Hassan Nojumi

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  1. MOBLIE PHONE NETWORKSDr. Hassan Nojumi Mobile Phone Networks Dr. Hassan Nojumi

  2. Functions of Mobile Phones Mobile Phone Networks Dr. Hassan Nojumi

  3. Functions of Mobile Phones • Send/Receive Voice Message Mobile Phone Networks Dr. Hassan Nojumi

  4. Functions of Mobile Phones • Send/Receive Voice Message • Send/Receive E-Mail Mobile Phone Networks Dr. Hassan Nojumi

  5. Functions of Mobile Phones • Send/Receive Voice Messages • Send/Receive E-Mail • Internet Connection Mobile Phone Networks Dr. Hassan Nojumi

  6. Functions of Mobile Phones • Send/Receive Voice Messages • Send/Receive E-Mail • Internet Connection • Complementing PDAs, GPS Receivers, etc. Mobile Phone Networks Dr. Hassan Nojumi

  7. Functionality Combination of . . . And . . . Mobile Phone Networks Dr. Hassan Nojumi

  8. Functionality Combination of Telephone Technology And . . . Mobile Phone Networks Dr. Hassan Nojumi

  9. Functionality Combination of Telephone Technology And Wireless Communication Mobile Phone Networks Dr. Hassan Nojumi

  10. Basic Notion Geographical Division into Cells Mobile Phone Networks Dr. Hassan Nojumi

  11. Basic Notion Geographical Division into Cells Result: Possibility of simultaneous use of frequency bands by users Mobile Phone Networks Dr. Hassan Nojumi

  12. Basic Technology Each Cell • About 10 square miles About 26 square kilometers Mobile Phone Networks Dr. Hassan Nojumi

  13. Basic Technology Each Cell • About 10 square miles About 26 square kilometers • With a Base Station with transmission equipment and antenna Mobile Phone Networks Dr. Hassan Nojumi

  14. Basic Technology • Communication can be made using the same frequencies in different cells. Mobile Phone Networks Dr. Hassan Nojumi

  15. Basic Technology • Communication can be made using the same frequencies in different cells. • Several service providers may use one Tower. Mobile Phone Networks Dr. Hassan Nojumi

  16. Basic Notion: Cellular Mobile Phone Networks Dr. Hassan Nojumi

  17. Communication Channels Simplex: One-Way Transmitter Receiver Mobile Phone Networks Dr. Hassan Nojumi

  18. Communication Channels Half-Duplex: Two-Way One at a time Transmitter Receiver Receiver Transmitter Mobile Phone Networks Dr. Hassan Nojumi

  19. Communication Channels Full-Duplex: Two-Way Simultaneously Transmitter Receiver Receiver Transmitter Mobile Phone Networks Dr. Hassan Nojumi

  20. Communication Channels Full-Duplex: Two-Way Simultaneously Mobile Phone Networks Dr. Hassan Nojumi

  21. Communication Channels Each cell • About 56 Voice Channels (Full-Duplex) Mobile Phone Networks Dr. Hassan Nojumi

  22. Communication Channels Each cell • About 56 Voice Channels (Full-Duplex) • Several Control Channels Mobile Phone Networks Dr. Hassan Nojumi

  23. Communication Channels Each cell • About 56 Voice Channels (Full-Duplex) • Several Control Channels • Three-fold increase possible by TDMA Mobile Phone Networks Dr. Hassan Nojumi

  24. Analog Versus Digital Digital signals can be manipulated, compressed, etc., more easily. Mobile Phone Networks Dr. Hassan Nojumi

  25. Analog Versus Digital Digital signals can be manipulated, compressed, etc., more easily. FSK (Frequency Shift Keying) for Tower/Phone Connection Mobile Phone Networks Dr. Hassan Nojumi

  26. Access Technologies Mobile Phone Networks Dr. Hassan Nojumi

  27. Access Technologies FDMA Frequency Division Multiple Access Mobile Phone Networks Dr. Hassan Nojumi

  28. Access Technologies FDMA Frequency Division Multiple Access Available frequency band is divided and each part assigned separately. Mobile Phone Networks Dr. Hassan Nojumi

  29. Access Technologies FDMA Mobile Phone Networks Dr. Hassan Nojumi

  30. Access Technologies FDMA • Traditional radio transmission Mobile Phone Networks Dr. Hassan Nojumi

  31. Access Technologies FDMA • Traditional radio transmission • Not efficient for digital transmission Mobile Phone Networks Dr. Hassan Nojumi

  32. Access Technologies TDMA Time Division Multiple Access Mobile Phone Networks Dr. Hassan Nojumi

  33. Access Technologies TDMA Time Division Multiple Access Available time is divided and each part assigned separately. Mobile Phone Networks Dr. Hassan Nojumi

  34. Access Technologies TDMA Mobile Phone Networks Dr. Hassan Nojumi

  35. Access Technologies TDMA Suitable for digital transmission as compression techniques can greatly reduce needed transmission time. Mobile Phone Networks Dr. Hassan Nojumi

  36. Access Technologies TDMA • “Multiprogramming” idea Mobile Phone Networks Dr. Hassan Nojumi

  37. Access Technologies TDMA • “Multiprogramming” idea • Has typically three times the capacity of an analog system Mobile Phone Networks Dr. Hassan Nojumi

  38. Access Technologies TDMA • IS- 54: 800 MHz Band Mobile Phone Networks Dr. Hassan Nojumi

  39. Access Technologies TDMA • IS- 54: 800 MHz Band • IS-136: 1900 MHz Band Mobile Phone Networks Dr. Hassan Nojumi

  40. Access Technologies TDMA • IS- 54: 800 MHz Band • IS-136: 1900 MHz Band • Dual-Band phones can operate in both bands. Mobile Phone Networks Dr. Hassan Nojumi

  41. Access Technologies TDMA/GSM Global System for Mobile Communications Specialized TDMA used for mobile phone communication Mobile Phone Networks Dr. Hassan Nojumi

  42. Access Technologies TDMA/GSM Encryption methods are used to make the call more secure. Mobile Phone Networks Dr. Hassan Nojumi

  43. Access Technologies TDMA/GSM To Connect to different service providers, users change their SIM(Subscriber Identification Module) Cards that contain necessary data for connection Mobile Phone Networks Dr. Hassan Nojumi

  44. Access Technologies CDMA Code Division Multiple Access Mobile Phone Networks Dr. Hassan Nojumi

  45. Access Technologies CDMA Code Division Multiple Access Communication data is digitized and distributed over the available band. Mobile Phone Networks Dr. Hassan Nojumi

  46. Access Technologies CDMA Code Division Multiple Access Each call is assigned a Sequence Code. Calls are overlaid over available band. Mobile Phone Networks Dr. Hassan Nojumi

  47. Access Technologies CDMA Mobile Phone Networks Dr. Hassan Nojumi

  48. Communication Cells • Each cell About 26 Km 2 Mobile Phone Networks Dr. Hassan Nojumi

  49. Communication Cells • Each cell About 26 Km • Many Base Stations and Transmission Towers required for a large city (paid off by many customers) 2 Mobile Phone Networks Dr. Hassan Nojumi

  50. Communication Cells All Base Stations in a region are controlled by an MTSO (Mobile Telephone Switching Office) Mobile Phone Networks Dr. Hassan Nojumi