Wireless WANs

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Describtions about W-WAN in detail & comparison Vs W-LAN

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Wireless WANs

  1. 1. Wireless WANs<br />Aram Mostowfi<br />aram2700@hotmail.com<br />MCA – University Of Madras<br />
  2. 2. Wireless WAN Components<br />Networking over vast distances<br />Provides coverage inside & outside buildings.<br />Use Cellular networks for data transmission like: CDMA, GSM, GPRS.<br />Wireless WAN user devices.<br />Radio NICs<br />Base Stations<br />Aram Mostowfi - University Of Madras - aram2700@hotmail.com<br />
  3. 3. Wireless WAN User Devices Are Small for Easy Mobility<br />Data Collector Mobile Phones PDA Laptop<br />Wireless WAN User Devices<br />Aram Mostowfi - University Of Madras - aram2700@hotmail.com<br />
  4. 4. Wireless WAN <br />Radio NIC:<br /> To interface a laptop or PDA to a wireless WAN, you need to purchase an applicable wireless WAN radio NIC (Network Interface Controller).<br />Aram Mostowfi - University Of Madras - aram2700@hotmail.com<br />
  5. 5. Wireless WAN Base Station <br />1- Cell towers:<br /> these base stations rely on wires to connect to a distribution system that provides switching and an interface to the Internet. In most cases, the towers reside outdoors to provide maximum coverage.<br />Aram Mostowfi - University Of Madras - aram2700@hotmail.com<br />
  6. 6. Wireless WAN Base Station <br />2- Satellite in orbit:<br /> On the ground, a user aims a dish antenna at the satellite, and the satellite receives the signal and retransmits the signal back to an Earth station.<br />Aram Mostowfi - University Of Madras - aram2700@hotmail.com<br />
  7. 7. Wireless WAN<br />Wireless WAN Systems:<br />1- Cellular-Based Wireless WANs.<br /> Cell towers, Concentrators, Voice Switches & Data gateways.<br />2- Space-Based Wireless WANs.<br /> Earth orbiting satellites, Base Station, Antenna.<br />Aram Mostowfi - University Of Madras - aram2700@hotmail.com<br />
  8. 8. Cellular-Based Wireless WANs<br />The cell tower receives signals from user devices and transmits information back to the user. <br />The component that makes the system a wireless WAN is the data gateway. The gateway is able to interface with data protocols in a way that makes it possible for users to surf the Internet, send and receive e-mails, and utilize corporate applications.<br />Aram Mostowfi - University Of Madras - aram2700@hotmail.com<br />
  9. 9. Cellular-Based Wireless WANs<br />SMS is a wireless form of the familiar instant messaging which is a text messaging system capable of sending a couple hundred characters at a time.<br />Many web sites use Wireless Markup Language (WML) to transform regular web pages into a format that is more easily read on a small device, such as a PDA or cell phone. WML also reduces the graphics on the page to compensate for the slower data rates of wireless WAN technologies.<br />Aram Mostowfi - University Of Madras - aram2700@hotmail.com<br />
  10. 10. Cellular-Based Wireless WAN Generations<br />1st Generation (1 G) :<br /><ul><li>Analog signals.
  11. 11. Using modem to connect PC to cellular system, (Digital Signal => Analog Signal).
  12. 12. 4 KHz Voice Channel.
  13. 13. 20-30 kbps data transmission speed.
  14. 14. Using Frequency Modulation (FM).</li></ul>Aram Mostowfi - University Of Madras - aram2700@hotmail.com<br />
  15. 15. Cellular-Based Wireless WAN Generations<br />2nd Generation (2 G):<br /><ul><li>Most of the telecommunications operators today have 2G systems.
  16. 16. General Packet Radio Service (GPRS) offers high-speed data rates over a global system for mobile communications (GSM) network.
  17. 17. Digital Cellular.
  18. 18. GPRS 171.2 kbps
  19. 19. SMS</li></ul>Aram Mostowfi - University Of Madras - aram2700@hotmail.com<br />
  20. 20. Cellular-Based Wireless WAN Generations<br />3rd Generation (3 G):<br /><ul><li>Many of the telecommunications operators are now beginning to offer.
  21. 21. 2-Mbps data rates for in-building implementations.
  22. 22. up to 384 kbps in urban areas.
  23. 23. 144 kbps in rural areas.
  24. 24. support multimedia applications.
  25. 25. Thus, both 3G and wireless LAN systems complement each other</li></ul>Aram Mostowfi - University Of Madras - aram2700@hotmail.com<br />
  26. 26. Cellular-Based Wireless WAN Generations<br />Aram Mostowfi - University Of Madras - aram2700@hotmail.com<br />
  27. 27. Space-Based Wireless WANs<br />Satellites<br /><ul><li>1-way for broadcasting television and other communications .
  28. 28. 2way exchange of data, allowing a user to send data up to the satellite (and vice versa).</li></ul>Aram Mostowfi - University Of Madras - aram2700@hotmail.com<br />
  29. 29. Space-Based Wireless WANs<br />Components:<br /><ul><li>frequencies between 450 MHz and 20 GHz.
  30. 30. To obtain global coverage, a minimum of three satellites is required.
  31. 31. The satellite acts as a signal repeater.
  32. 32. Example: Satellite Mobile Phones: Thuraya& Iridium.</li></ul>Aram Mostowfi - University Of Madras - aram2700@hotmail.com<br />
  33. 33. Space-Based Wireless WANs<br />Aram Mostowfi - University Of Madras - aram2700@hotmail.com<br />
  34. 34. Space-Based Wireless WANs<br />Aram Mostowfi - University Of Madras - aram2700@hotmail.com<br />
  35. 35. Wireless WAN Technologies<br /><ul><li>focus on modulation of voice and data
  36. 36. Each user has a dedicated channel
  37. 37. This significantly reduces interference between wireless WAN user devices and base stations.
  38. 38. Different Modulations:
  39. 39. FDMA
  40. 40. TDMA
  41. 41. CDMA</li></ul>Aram Mostowfi - University Of Madras - aram2700@hotmail.com<br />
  42. 42. Wireless WAN Technologies<br />Aram Mostowfi - University Of Madras - aram2700@hotmail.com<br />
  43. 43. <ul><li>Coverage
  44. 44. Speed
  45. 45. Data Security
  46. 46. Hotspots
  47. 47. Costs</li></ul>W-WAN Vs W-LAN<br />Aram Mostowfi - University Of Madras - aram2700@hotmail.com<br />
  48. 48. ~100 meters<br /> MAC, Key authentication, Physical access<br />Aram Mostowfi - University Of Madras - aram2700@hotmail.com<br />
  49. 49. THANK YOU<br />Aram Mostowfi - University Of Madras - aram2700@hotmail.com<br />

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