WiMAX Vs Wi-Fi
WiMAX <ul><li>W orldwide  I nteroperability for  M icrowave  Acc ess  </li></ul><ul><li>Brand licensed by the WiMax Forum....
WiMAX <ul><li>WiMAX, in fact, comes in two forms, a so called ‘fixed WiMAX’ and a ‘mobile WiMAX’. </li></ul><ul><li>WiMAX ...
WiMAX Architecture MIB – Management Information Base
Wi-Fi <ul><li>Stands for Wireless Fidelity. </li></ul><ul><li>Brand licensed by the Wi-Fi Alliance.  </li></ul><ul><li>Wi-...
Wi-Fi   <ul><li>Wi-Fi has grown from being just a LAN cable replacement technology to a public wireless access technology....
Wi-Fi <ul><li>New developments are taking place within the 802.11 standardization group </li></ul><ul><li>With the increas...
Wireless Systems
802.11 Protocol Stack
802.16 protocol stack
Scalability <ul><li>Channel bandwidths can be chosen by operator (e.g. for sectorization) </li></ul><ul><li>1.5 MHz to 20 ...
Bit Rate : Relative Performance   802.16a ~5.0 bps/Hz ~2.7 bps/Hz 54 Mbps 20 MHz 63 Mbps* 10, 20 MHz; 1.75, 3.5, 7, 14 MHz...
Coverage 802.16 is designed for market coverage <ul><li>Optimized for outdoor NLOS performance </li></ul><ul><li>Standard ...
Range 802.16 is designed for distance <ul><li>Optimized for  up to 50 Km </li></ul><ul><li>Designed to handle many users s...
Quality of Service (QoS) 802.16a is designed for carrier class operation <ul><li>Grant-request MAC  </li></ul><ul><li>Desi...
Security 802.16a maintains fixed wireless security <ul><li>Triple-DES (128-bit) and RSA  (1024-bit) </li></ul><ul><li>Exis...
WiMAX vs Wi-Fi
WiMAX vs Wi-Fi
Comparison of WiMAX, WiFi and 3G technology
802.11 vs 802.16:  Summary 802.11 and 802.16 both gain broader industry acceptance through  conformance and interoperabili...
Will WiMAX displace WiFi? <ul><li>WiMAX will not replace WiFi completely, but work TOGETHER </li></ul><ul><li>Intel is cur...
Wi-fi and WiMax Together
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  1. 1. WiMAX Vs Wi-Fi
  2. 2. WiMAX <ul><li>W orldwide I nteroperability for M icrowave Acc ess </li></ul><ul><li>Brand licensed by the WiMax Forum. </li></ul><ul><li>“ a standards-based technology enabling the delivery of last mile wireless broadband access as an alternative to cable and DSL” </li></ul><ul><li>WiMAX was seen as more of a Metropolitan Area Network (MAN) technology providing a much larger coverage. </li></ul><ul><li>Based on IEEE 802.16 </li></ul>
  3. 3. WiMAX <ul><li>WiMAX, in fact, comes in two forms, a so called ‘fixed WiMAX’ and a ‘mobile WiMAX’. </li></ul><ul><li>WiMAX in its fixed form is seen as a possible alternative to expensive cable and fibre deployment. </li></ul><ul><li>It is faster to deploy and less expensive and it also offers operators more flexibility in terms of deployment time frame and possible installation areas. </li></ul><ul><li>3G or other cellular network operators could see this as a potential substitute or as a complement to their cellular product. </li></ul>
  4. 4. WiMAX Architecture MIB – Management Information Base
  5. 5. Wi-Fi <ul><li>Stands for Wireless Fidelity. </li></ul><ul><li>Brand licensed by the Wi-Fi Alliance. </li></ul><ul><li>Wi-Fi is a local area network technology that was originally thought to replace the thousands of miles of LAN cables. </li></ul><ul><li>Wireless Local Area Networks (WLAN) </li></ul><ul><li>Based on IEEE 802.11 </li></ul>
  6. 6. Wi-Fi <ul><li>Wi-Fi has grown from being just a LAN cable replacement technology to a public wireless access technology. </li></ul><ul><li>Cheap and readily available equipment. </li></ul><ul><li>WiFi has been viewed as complementary to 3G and other mobile standards as it has worked to enhance mobile services offered by operators. </li></ul><ul><li>It’s coverage is not as great as that of 3G, but it gives a much higher transmission rate than mobile technology. </li></ul><ul><li>Handoff between WiFi access points is still not possible and, therefore, it is known more as a wireless access technology than a mobile technology. </li></ul>
  7. 7. Wi-Fi <ul><li>New developments are taking place within the 802.11 standardization group </li></ul><ul><li>With the increasing popularity of VoIP, many see WiFi as one of the possible means of using VoIP with some form of mobility </li></ul><ul><li>802.11r for wireless VoIP and other real time applications </li></ul><ul><li>802.11s for meshed WiFi networking </li></ul><ul><li>Making WiFi more mobile could make it more of a substitute to mobile technologies </li></ul>
  8. 8. Wireless Systems
  9. 9. 802.11 Protocol Stack
  10. 10. 802.16 protocol stack
  11. 11. Scalability <ul><li>Channel bandwidths can be chosen by operator (e.g. for sectorization) </li></ul><ul><li>1.5 MHz to 20 MHz width channels. MAC designed for scalability independent of channel bandwidth </li></ul><ul><li>MAC designed to support thousands of users. </li></ul><ul><li>Wide, fixed (20MHz) frequency channels </li></ul><ul><li>MAC designed to support 10’s of users </li></ul>802.16 802.11
  12. 12. Bit Rate : Relative Performance 802.16a ~5.0 bps/Hz ~2.7 bps/Hz 54 Mbps 20 MHz 63 Mbps* 10, 20 MHz; 1.75, 3.5, 7, 14 MHz; 3, 6 MHz 802.11a Channel Bandwidth Maximum bps/Hz Maximum Data Rate * Assuming a 14 MHz channel 802.16a is designed for metropolitan performance
  13. 13. Coverage 802.16 is designed for market coverage <ul><li>Optimized for outdoor NLOS performance </li></ul><ul><li>Standard supports mesh network topology </li></ul><ul><li>Standard supports advanced antenna techniques </li></ul><ul><li>Optimized for indoor performance </li></ul><ul><li>No mesh topology support within ratified standards </li></ul>802.16 802.11
  14. 14. Range 802.16 is designed for distance <ul><li>Optimized for up to 50 Km </li></ul><ul><li>Designed to handle many users spread out over kilometers </li></ul><ul><li>Designed to tolerate greater multi-path delay spread (signal reflections) up to 10.0μ seconds </li></ul><ul><li>PHY and MAC designed with multi-mile range in mind </li></ul><ul><li>StandardMAC;Sectoring/MIMO/AMC for Rate/Range dynamic tradeoff </li></ul><ul><li>Optimized for ~100 meters </li></ul><ul><li>No “near-far” compensation. </li></ul><ul><li>Designed to handle indoor multi-path(delay spread of 0.8μ seconds). </li></ul><ul><li>Optimization centers around PHY and MAC layer for 100m range. </li></ul><ul><li>Range can be extended by cranking up the power – but MAC may be non-standard. </li></ul>802.16 802.11
  15. 15. Quality of Service (QoS) 802.16a is designed for carrier class operation <ul><li>Grant-request MAC </li></ul><ul><li>Designed to support Voice and Video from ground up </li></ul><ul><li>Supports differentiated service levels: e.g. T1 for business customers; best effort for residential. </li></ul><ul><li>TDD/FDD/HFDD – symmetric or asymmetric </li></ul><ul><li>Centrally-enforced QoS </li></ul><ul><li>Contention-based MAC (CSMA/CA) => no guaranteed QoS </li></ul><ul><li>Standard cannot currently guarantee latency for Voice, Video </li></ul><ul><li>Standard does not allow for differentiated levels of service on a per-user basis </li></ul><ul><li>TDD only – asymmetric </li></ul><ul><li>802.11e (proposed) QoS is prioritization only </li></ul>802.16a 802.11
  16. 16. Security 802.16a maintains fixed wireless security <ul><li>Triple-DES (128-bit) and RSA (1024-bit) </li></ul><ul><li>Existing standard is WPA + WEP </li></ul><ul><li>802.11i in process of addressing security </li></ul>802.16a 802.11
  17. 17. WiMAX vs Wi-Fi
  18. 18. WiMAX vs Wi-Fi
  19. 19. Comparison of WiMAX, WiFi and 3G technology
  20. 20. 802.11 vs 802.16: Summary 802.11 and 802.16 both gain broader industry acceptance through conformance and interoperability by multiple vendors 802.16 complements 802.11 by creating a complete MAN-LAN solution 802.11 is optimized for license-exempt LAN operation 802.16 is optimized for license-exempt and licensed MAN operation.
  21. 21. Will WiMAX displace WiFi? <ul><li>WiMAX will not replace WiFi completely, but work TOGETHER </li></ul><ul><li>Intel is currently integrating WiMAX and WiFi into a single Centrino chip. </li></ul><ul><li>WiFi’s primary role will always be autonomous hotspot service </li></ul><ul><li>areas (indoor and outdoor 0 ft. < cell radii <500 ft.). </li></ul><ul><li>WiMax will ultimately replace WiFi in large-scale (greater than 1 mi.Sq.) commercial and public roles. </li></ul>
  22. 22. Wi-fi and WiMax Together

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