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Wireless WANs
 

Wireless WANs

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

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

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    Wireless WANs Wireless WANs Presentation Transcript

    • Wireless WANs
      Aram Mostowfi
      aram2700@hotmail.com
      MCA – University Of Madras
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • Cellular-Based Wireless WAN Generations
      1st Generation (1 G) :
      • Analog signals.
      • Using modem to connect PC to cellular system, (Digital Signal => Analog Signal).
      • 4 KHz Voice Channel.
      • 20-30 kbps data transmission speed.
      • Using Frequency Modulation (FM).
      Aram Mostowfi - University Of Madras - aram2700@hotmail.com
    • Cellular-Based Wireless WAN Generations
      2nd Generation (2 G):
      • Most of the telecommunications operators today have 2G systems.
      • General Packet Radio Service (GPRS) offers high-speed data rates over a global system for mobile communications (GSM) network.
      • Digital Cellular.
      • GPRS 171.2 kbps
      • SMS
      Aram Mostowfi - University Of Madras - aram2700@hotmail.com
    • Cellular-Based Wireless WAN Generations
      3rd Generation (3 G):
      • Many of the telecommunications operators are now beginning to offer.
      • 2-Mbps data rates for in-building implementations.
      • up to 384 kbps in urban areas.
      • 144 kbps in rural areas.
      • support multimedia applications.
      • Thus, both 3G and wireless LAN systems complement each other
      Aram Mostowfi - University Of Madras - aram2700@hotmail.com
    • Cellular-Based Wireless WAN Generations
      Aram Mostowfi - University Of Madras - aram2700@hotmail.com
    • Space-Based Wireless WANs
      Satellites
      • 1-way for broadcasting television and other communications .
      • 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
    • Space-Based Wireless WANs
      Components:
      • frequencies between 450 MHz and 20 GHz.
      • To obtain global coverage, a minimum of three satellites is required.
      • The satellite acts as a signal repeater.
      • Example: Satellite Mobile Phones: Thuraya& Iridium.
      Aram Mostowfi - University Of Madras - aram2700@hotmail.com
    • Space-Based Wireless WANs
      Aram Mostowfi - University Of Madras - aram2700@hotmail.com
    • Space-Based Wireless WANs
      Aram Mostowfi - University Of Madras - aram2700@hotmail.com
    • Wireless WAN Technologies
      • focus on modulation of voice and data
      • Each user has a dedicated channel
      • This significantly reduces interference between wireless WAN user devices and base stations.
      • Different Modulations:
      • FDMA
      • TDMA
      • CDMA
      Aram Mostowfi - University Of Madras - aram2700@hotmail.com
    • Wireless WAN Technologies
      Aram Mostowfi - University Of Madras - aram2700@hotmail.com
      • Coverage
      • Speed
      • Data Security
      • Hotspots
      • Costs
      W-WAN Vs W-LAN
      Aram Mostowfi - University Of Madras - aram2700@hotmail.com
    • ~100 meters
      MAC, Key authentication, Physical access
      Aram Mostowfi - University Of Madras - aram2700@hotmail.com
    • THANK YOU
      Aram Mostowfi - University Of Madras - aram2700@hotmail.com