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Wifi wimax


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Wifi wimax

  2. 2. OUTLINE Wireless Standards Introduction to Wi-Fi History How Wi-Fi works? Constituents of Wi-Fi Wi-Fi Standards Strengths & weaknesses of Wi-Fi Introduction to WIMAX Architecture WIMAX Standards Flavors of WIMAX Infrastructure of WIMAX Strengths & weaknesses of WIMAX
  4. 4. INTRODUCTION TO WI-FIWIFI stands for wireless fidelityBrand licensed by the Wi-Fi AllianceBased on IEEE 802.11a,b and g standardsEarly 1980s, 1st wireless system was developedAfter 1990, wireless technologies gradually widelyacceptedWi-Fi is a local area network technology that wasoriginally thought to replace the thousands of miles ofLAN cables
  5. 5. CONT…WIFI is considered to be one of the first widelydeployed fixed broadband wireless networks.The Wi-Fi architecture consists of a base station thatwireless hosts connect to in order to access networkresources.As long as the users remain within 300 feet of thefixed wireless access point, they can maintainbroadband wireless connectivity.
  6. 6. ORIGIN OF WI-FI The precursor to Wi-Fi was invented in 1991 by NCR Corporation in Nieuwegein, Netherland. The first wireless products were brought on the market under the name WaveLAN with a speeds of 1 MB to 2 MB. Vic Hayes has been named as father of “Wi-Fi’’.
  7. 7. HOW WI-FIWORKS ?
  8. 8. WHAT A WIRELESS NETWORKMADE UP OF: Base stations, Access points, or Gateways The base station sends and receives radio signals to and from the Wi-Fi radio in your laptop or PC. Enabling you to share your Internet connection with other users on the network. Access points and gateways have a wide range of features and performance capabilities, but they all provide this basic network connection service.
  9. 9. TYPICAL COMMUNITY WI-FICONSTITUENTS High gain Parabolic grid antennas to beam the signal to over 30km from tower to tower Sector antennas to beam the signal from the towers to the community users Customer Premises equipment (CPE) to access the signal from the towers Other components that need to be installed in order to put the above systems together
  10. 10. WIFI STANDARDSStandard Throughput Range Frequency802.11a Up to 54 Mbps Up to 300 ft Between 5 and 6 Ghz802.11b Up to 11 Mbps Up to 300 ft 2.4 Ghz802.11g Up to 54 Mbps Up to 300 ft 2.4 Ghz
  11. 11. STRENGTHS OF WI-FIDoes not require regulatory approval for individual.Wi-Fi allows local area network to deployed without wiresfor client devicesWi-Fi can make access publicly available at Wi-Fihotspots.Users are able to be mobile for up to 300 feet from theaccess point.There are many Wi-Fi compatible products that are availableat a low cost and can interoperate with other networktechnologies.
  12. 12. WEAKNESSES OF WI-FI Designed technically for short-range operations and basically an indoor technology Low bandwidth compared to wired networks Limited level of mobility Susceptible to interference Security is a concern
  13. 13. WIMAXWIMAX stands for Worldwide Interoperability forMicrowave AccessThe technology is specified by IEEE as 802.16 standard.It is a standards-based technology enabling the delivery oflast mile wireless broadband access as an alternative tocable and DSL.WIMAX is expected to provide fixed, nomadic,portable and eventually, mobile wireless broadbandconnectivity without the need for direct line-of-sight (LOS) with a base station.
  14. 14. CONT…In a typical cell radius deployment of three to tenkilometers, WIMAX Forum Certified™ systems canbe expected to deliver capacity of up to 40 Mbps perchannel, for fixed and portable access applications.Goal: Provide high-speed Internet access to home andbusiness subscribers, without wires.Mobile network deployments are expected toprovide up to 15 Mbps of capacity within a typicalcell radius deployment of up to three kilometers.
  15. 15. 802.16 ARCHITECTURE
  16. 16. REFERENCE MODELApplication ApplicationTransport TransportNetwork Network Network NetworkData Link Data Link Data Link Data LinkPhysical Physical Physical Physical Radio Medium
  17. 17. WIMAX STANDARDS 802.16 802.16a 802.16- 802.16e- 2004 2005Date December January June DecemberCompleted 2001 2003 2004 2005Spectrum 10-66 GHz < 11 GHz < 11 GHz < 6 GHzOperation LOS Non-LOS Non-LOS Non-LOS and MobileBit Rate 32-134 Mbps Up to 75 Up to 75 Up to 15 Mbps Mbps MbpsCell 1-3 miles 3-5 miles 3-5 miles 1-3 milesRadius
  20. 20. STRENGTHS OFWIMAXFaster than broadband serviceSingle station can serve hundreds of usersNo more DSL installation feesMuch faster deployment of new users comparing to wirednetworks.Would allow gamers access to ad hoc local networks ofother players with the same gear- without any internetconnection.WIMAX services are available in the rural area too
  21. 21. WEAKNESSES OFWIMAXLine of sight is needed for longer connections.Weather conditions like rain could interrupt the signal.Big installation and operational cost which makes itexpensive.Bandwidth Shared Among UsersWIMAX network is very heavy in structure therefore needmuch electrical support for running the overall network.Speed Decrease over Large DistanceWhen compared to other modes of broadband connectivity,for example, fiber optic cables and satellite internet,WIMAX is still slow