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Fixed WiMAX

Fixed WiMAX. By, Shah Ankur Vasant. WiMAX. WIMAX stands for Worldwide Interoperability for Microwave Access The original IEEE 802.16 standard (now called "Fixed WiMAX") was published in 2001 . WiMAX adopted some of its technology from WiBro , a service marketed in Korea

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Fixed WiMAX

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  1. Fixed WiMAX By, Shah Ankur Vasant

  2. WiMAX • WIMAX stands for Worldwide Interoperability for Microwave Access • The original IEEE 802.16 standard (now called "Fixed WiMAX") was published in 2001. • WiMAX adopted some of its technology from WiBro, a service marketed in Korea • Its a communication technology for wirelessly delivering high-speed Internet service to large geographical areas • Geographical Area Coverage: 30 miles • Bandwidth: 75 Mbps • Frequency bands- 2 to 11 and 10 to 66 Ghz(licensed and unlicensed bands respectively) • Defines both MAC and PHY layer

  3. WiMax Over Wi-Fi • Coverage Area: • Below 100m for Wi-Fi • Scalability • Supports around 10 users • Bitrate: • 54 Mbps in 20 Mhz Channels • Cost • For Laying Cables throughout.

  4. 802.16 Standards

  5. Types Of WiMAX • Wireless access can be divided into three classes • Stationary • Pedestrian • Vehicular • 802.16 Standards is classified into two types of usage models • Fixed WiMAX • Mobile WiMAX

  6. IEEE 802.16-2004 • Current Standard for using fixed WiMax • 3.5 GHz and 5.8 GHz frequency bands • Frequency division duplexing (FDD) • Time division duplexing (TDD) • IEEE 802.16e - 2005 • extension to the 802.16-2004 • supports mobile communications • 2.3 and 2.5 GHz frequency bands.

  7. A WIMAX system consists of • WiMAX Base Station (BS) • Base Station is similar to a cellphone tower and Covers A radius of 30miles(3000 SqFt) • WiMAX receiver (WiMAX CPE) • Customer Premise Equipment • Receiver could be a small box or PCMCIA card, or they could be built into a laptop

  8. Fixed WiMAX

  9. WiMAX Network Architecture • P2P Point to Point • P2MP Point to Multi Point • Mesh Network

  10. P2P and P2MP

  11. Mesh

  12. Modes Of Operation • Non-Line-Of-Sight : • WiFi sort of service, where a small antenna on your computer connects to the tower • uses a lower frequency range -- 2 GHz to 11 GHz • Lower-wavelength transmissions are not as easily disrupted by physical obstructions -- they are better able to diffract or bend around obstacles. • Line-Of-Sight : • fixed dish antenna points straight at the WiMAX tower from a rooftop or pole • stronger and more stable • Allows to send a lot of data with fewer errors • Uses High Frequencies, ranges reaching 66 Mhz • Less Interference and More Bandwidth

  13. Protocol Layers Of WiMAX 802.16 Protocol Architecture has 4 layers: Convergence, MAC, Transmission and physical, which can be map to two OSI lowest layers: physical and data link • OSI Physical Layer • OSI Data Link Layer

  14. Protocol Architecture • MAC Protocol: Convergence sub-layer: • Handle the higher-layer protocols Common part sub-layer: • Channel access, connection establishment and maintenance & QoS Security sub-layer: • Authentication, secure key exchange and encryption • Physical and transmission layer functions: • Encoding/decoding of signals • Preamble generation/removal • Bit transmission/reception

  15. Physical Layer Features: • Frequency Band • Channel Bandwidth • MIMO • FDD/TDD • Signal Modulation: Data Link Layer Features: • access protocol, • security and • session establishment functions.

  16. WiMAX PHY Frame

  17. Features Of WiMAX • Scalability • Quality of Service • Range • Coverage

  18. Advantages of WiMAX • Faster than broadband service • No need to lay cables thus reducing cost • Easier to extend to Sub-Urban and rural areas • Much Wider coverage • Can use licensed spectrum • Provides data, telecommunication services and portability.

  19. Disadvantages • Lack of Quality • Low bit rate over Long distance • Speed of connectivity • Sharing of bandwidth • WiMax over Wi-Fi • Expensive network • Bad Weather • Power consuming

  20. QUESTIONS ??

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