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Wimax – Wireless Broadband

Wimax – Wireless Broadband. Wimax definition. WiMax (Worldwide Interoperability for Microwave Access) is a wireless broadband technology, which supports point to multi-point (PMP) broadband wireless access WiMax is basically a new shorthand term for IEEE Standard 802.16 . Wimax reach.

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Wimax – Wireless Broadband

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  1. Wimax – Wireless Broadband

  2. Wimax definition • WiMax (Worldwide Interoperability for Microwave Access) is a wireless broadband technology, which supports point to multi-point (PMP) broadband wireless access • WiMax is basically a new shorthand term for IEEE Standard 802.16

  3. Wimax reach • The IEEE wireless standard has a range of up to 50 kilometers, • Can deliver broadband at around 75 megabits per second

  4. Wimax spectrum • The 802.16, WiMax standard was published in March 2002 and provided updated information on the Metropolitan Area Network (MAN) technology. The extension given in the March publication, extended the line-of-sight fixed wireless MAN standard, focused solely on a spectrum from 10 GHz to 60+ GHz.

  5. Bands • This extension provides for non-line of sight access in low frequency bands like 2 - 11 GHz. These bands are sometimes unlicensed. This also boosts the maximum distance from 31 to 50 miles and supports PMP (point to multipoint) and mesh technologies.

  6. Comparison table

  7. Protocol service • WiMax provides many user applications and interfaces like Ethernet, TDM, ATM, IP, and VLAN. • The IEEE 802.16 standard is versatile enough to accommodate time division multiplexing (TDM) or frequency division duplexing (FDD) deployments and also allows for both full an d half-duplex terminals.

  8. Physical • 802.16 supports three physical layers. The mandatory physical mode is 256-point FFT OFDM (Orthogonal Frequency Division Multiplexing). The other modes are Single carrier (SC) and 2048 OFDMA (Orthogonal Frequency Division Multiplexing Access) modes. The corresponding European standard - the ETSI Hiperman standard defines a single PHY mode identical to the 256 OFDM modes in the 802.16d standard.

  9. MAC • The MAC was developed for a point-to-multipoint wireless access environment and can accommodate protocols like ATM, Ethernet and IP (Internet Protocol). The MAC frame structure dynamic uplink and downlink profiles of terminals as per the link conditions. This is to ensure a trade-off of capacity and real-time robustness.

  10. MAC Protocol basics • The MAC uses a protocol data unit of variable length, which increases the standards efficiency. Multiple MAC protocol data unit can be sent as a single physical stream to save overload. Also, multiple Service data units (SDU) can be sent together to save on MAC header overhead. By fragmenting, you can send large volumes of data (SDUs) across frame boundaries and can guarantee a QoS (Quality of Service) of competing services. The MAC uses a self-correcting bandwidth request scheme to avoid overhead and acknowledgement delays. • This also allows better QoS handling than the traditional acknowledged schemes. The terminals have a variety of options to request for bandwidth depending on the QoS and other parameters. The signal requirement can be polled or a request can be piggybacked.

  11. Activity periods • The 802.16 MAC protocol performs mainly two tasks Periodic and Aperiodic activities. Fast activities (periodic) like scheduling, packing, fragmentation and ARQ are hard-pr essed for time and have hard tight deadlines. They must be performed within a single frame. • The slow activities, on the other hand, typically execute as per pre-fixed timers, but are not associated with any timers. They also do not have specific time frame or deadline.

  12. 802.16

  13. Standards scope

  14. ATM service adaptation

  15. Modulation

  16. Reference network

  17. Another network infra

  18. Short • IEEE 802.16 standards are concerned with the air interface between a subscriber's transceiver station and a base transceiver station. The fixed WiMax standard IEEE 802.16-2004 (also known as 802.16d) is approved by the IEEE in June 2004, which provides fixed, point-to-multi point broadband wireless access service and its product profile utilizes the OFDM 256-FFT (Fast Fourier Transform) system profile. The fixed WiMAX 802.16-2004 standard supports both time division duplex (TDD) and frequency division duplex (FDD) services - the latter of which delivers full duplex transmission on the same signal if desired. In Dec. 2005, IEEE approved the mobile WiMax standard, the 802.16-2005 (also known as 802.16e). IEEE 802.16e, based on the early WiMax standard 802.16a, adds mobility features to WiMAX in the 2 to 11 GHz licensed bands. 802.16e allows for fixed wireless and mobile Non Line of Sight (NLOS) applications primarily by enhancing the OFDMA (Orthogonal Frequency Division Multiple Access).

  19. References • http://www.wimax-industry.com/wp/papers/alvarion_Wimax_wp.pdf • http://www.intel.com/netcomms/technologies/wimax/304471.pdf • http://www.wimaxforum.org/news/downloads/WiMAXWhitepaper.pdf • http://www.wimaxforum.org/news/downloads/Applications_for_802.16-2004_and_802.16e_WiMAX_networks_final.pdf • http://www.wimaxforum.org/news/downloads/WiMAXNLOSgeneral-versionaug04.pdf

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