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  • 1. Wireless WANs
    Aram Mostowfi
    aram2700@hotmail.com
    MCA – University Of Madras
  • 2. Wireless WAN Components
    Networking over vast distances
    Provides coverage inside & outside buildings.
    Use Cellular networks for data transmission like: CDMA, GSM, GPRS.
    Wireless WAN user devices.
    Radio NICs
    Base Stations
    Aram Mostowfi - University Of Madras - aram2700@hotmail.com
  • 3. Wireless WAN User Devices Are Small for Easy Mobility
    Data Collector Mobile Phones PDA Laptop
    Wireless WAN User Devices
    Aram Mostowfi - University Of Madras - aram2700@hotmail.com
  • 4. Wireless WAN
    Radio NIC:
    To interface a laptop or PDA to a wireless WAN, you need to purchase an applicable wireless WAN radio NIC (Network Interface Controller).
    Aram Mostowfi - University Of Madras - aram2700@hotmail.com
  • 5. Wireless WAN Base Station
    1- Cell towers:
    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.
    Aram Mostowfi - University Of Madras - aram2700@hotmail.com
  • 6. Wireless WAN Base Station
    2- Satellite in orbit:
    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.
    Aram Mostowfi - University Of Madras - aram2700@hotmail.com
  • 7. Wireless WAN
    Wireless WAN Systems:
    1- Cellular-Based Wireless WANs.
    Cell towers, Concentrators, Voice Switches & Data gateways.
    2- Space-Based Wireless WANs.
    Earth orbiting satellites, Base Station, Antenna.
    Aram Mostowfi - University Of Madras - aram2700@hotmail.com
  • 8. Cellular-Based Wireless WANs
    The cell tower receives signals from user devices and transmits information back to the user.
    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.
    Aram Mostowfi - University Of Madras - aram2700@hotmail.com
  • 9. Cellular-Based Wireless WANs
    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.
    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.
    Aram Mostowfi - University Of Madras - aram2700@hotmail.com
  • 10. Cellular-Based Wireless WAN Generations
    1st Generation (1 G) :
    • Analog signals.
    • 11. Using modem to connect PC to cellular system, (Digital Signal => Analog Signal).
    • 12. 4 KHz Voice Channel.
    • 13. 20-30 kbps data transmission speed.
    • 14. Using Frequency Modulation (FM).
    Aram Mostowfi - University Of Madras - aram2700@hotmail.com
  • 15. Cellular-Based Wireless WAN Generations
    2nd Generation (2 G):
    • Most of the telecommunications operators today have 2G systems.
    • 16. General Packet Radio Service (GPRS) offers high-speed data rates over a global system for mobile communications (GSM) network.
    • 17. Digital Cellular.
    • 18. GPRS 171.2 kbps
    • 19. SMS
    Aram Mostowfi - University Of Madras - aram2700@hotmail.com
  • 20. Cellular-Based Wireless WAN Generations
    3rd Generation (3 G):
    • Many of the telecommunications operators are now beginning to offer.
    • 21. 2-Mbps data rates for in-building implementations.
    • 22. up to 384 kbps in urban areas.
    • 23. 144 kbps in rural areas.
    • 24. support multimedia applications.
    • 25. Thus, both 3G and wireless LAN systems complement each other
    Aram Mostowfi - University Of Madras - aram2700@hotmail.com
  • 26. Cellular-Based Wireless WAN Generations
    Aram Mostowfi - University Of Madras - aram2700@hotmail.com
  • 27. Space-Based Wireless WANs
    Satellites
    • 1-way for broadcasting television and other communications .
    • 28. 2way exchange of data, allowing a user to send data up to the satellite (and vice versa).
    Aram Mostowfi - University Of Madras - aram2700@hotmail.com
  • 29. Space-Based Wireless WANs
    Components:
    • frequencies between 450 MHz and 20 GHz.
    • 30. To obtain global coverage, a minimum of three satellites is required.
    • 31. The satellite acts as a signal repeater.
    • 32. Example: Satellite Mobile Phones: Thuraya& Iridium.
    Aram Mostowfi - University Of Madras - aram2700@hotmail.com
  • 33. Space-Based Wireless WANs
    Aram Mostowfi - University Of Madras - aram2700@hotmail.com
  • 34. Space-Based Wireless WANs
    Aram Mostowfi - University Of Madras - aram2700@hotmail.com
  • 35. Wireless WAN Technologies
    • focus on modulation of voice and data
    • 36. Each user has a dedicated channel
    • 37. This significantly reduces interference between wireless WAN user devices and base stations.
    • 38. Different Modulations:
    • 39. FDMA
    • 40. TDMA
    • 41. CDMA
    Aram Mostowfi - University Of Madras - aram2700@hotmail.com
  • 42. Wireless WAN Technologies
    Aram Mostowfi - University Of Madras - aram2700@hotmail.com
  • 43. W-WAN Vs W-LAN
    Aram Mostowfi - University Of Madras - aram2700@hotmail.com
  • 48. ~100 meters
    MAC, Key authentication, Physical access
    Aram Mostowfi - University Of Madras - aram2700@hotmail.com
  • 49. THANK YOU
    Aram Mostowfi - University Of Madras - aram2700@hotmail.com