INTRODUCTION Think about how you access the internet today. There are basically three different options: BROADBAND ACCESS WIFI ACCESS DIAL-UP ACCESS The main problems with broadband access are that it is pretty expensive & it doesn’t reach all areas. The main problem with WIFI is that hot spots are very small, so coverage is sparse.
What if there were a new technology that solved all of these problems?This new Technology would provide:- High speed of broadband service Wireless rather than wired access That is less expensive than cable Much easier to extend to rural areas Broad coverage like cell phone networks.
WHAT IS WIMAX? Worldwide Interoperability for Microwave Access. WIMAX is a wireless digital communications system also known as IEEE 802.16. WiMAX was seen as more of a Metropolitan Area Network (MAN) technology providing a much larger coverage. WIMAX can provide broadband wireless access up to 30 miles(50 km) for fixed stations and 3-10 miles(5-15 km) for mobile stations. Next generation of wi-fi. Wi- max is the fast emerging wide area wireless broad band technology.
Why is it Interesting? Promise of potential low cost and flexibility in building broadband networks. Scalability, as extra channels and base stations can be added incrementally as bandwidth demand grows. Support for both voice and video as well as Internet data. Broad Coverage High speed up to 70 Mb/sec.
How WIMAX Works? A WIMAX tower station can connect directly to the internet using a high-bandwidth, wired connection. It can also connect to another WIMAX tower using a line-of- sight, microwave link. This connection to a second tower, along with the ability of a single tower to cover up to 3,000 square miles, is what allows WIMAX to provide coverage to remote rural areas.
WiMAX Architecture MIB – Management Information Base
WiMax can provide 2 forms of wireless service: Non-LOS, where a small antenna on your computer connects to the tower in the low frequency range of 2-11 GHz. LOS, where a fixed antenna points straight at the WiMax tower from a rooftop or pole. The LOS connection is stronger and more stable, so it is able to send a lot of data with fewer errors. Uses higher frequencies, with ranges reaching a possible 66 GHz. Through stronger LOS antennas, WiMax transmitting stations would send data to WiMax enabled computers or routers set up within 30 mile radius.
TYPES OF WIMAXFIXED WIMAX: Wireless access application in which the location of the end- user termination and the network access point to be connected to the end-user are fixed.
MOBILE WIMAX: Mobile WIMAX implementations can be used to deliver both fixed & mobile services It offers superior building penetration and improved security.
Characteristics of WiMaxFrequency Ranges 10 - 66 GHz Short wavelength Line-of-sight (LOS) required Negligible multipath 2 – 11 GHz Longer wavelength Improved range and in-building penetration LOS not required Multipath effects may be significant
Cost Effective There are areas of the world-especially in rural areas- where deploying wired broadband infrastructure is not cost effective. In this case WIMAX is very cost effective. High speed of Broadband service Another benefit of WIMAX is the ability to get a higher connection speeds farther away from the transmitter.
Wi-Fi Stands for Wireless Fidelity. Brand licensed by the Wi-Fi Alliance. Wi-Fi is a local area network technology that was originally thought to replace the thousands of miles of LAN cables. Wireless Local Area Networks (WLAN) Based on IEEE 802.11
Difference Between WiMAX and Wi-Fi Range: 802.11 802.16 Optimized for ~100 meters Optimized for up to 50 Km No “near-far” compensation. Designed to handle many users spread out over kilometers Designed to handle indoor multi- path(delay spread of 0.8μ Designed to tolerate greater seconds). multi-path delay spread (signal reflections) up to 10.0μ seconds Optimization centers around PHY and MAC layer for 100m range. PHY and MAC designed with multi- mile range in mind Range can be extended by cranking up the power – but MAC StandardMAC;Sectoring/MIMO/AMC may be non-standard. for Rate/Range dynamic tradeoff
Bit Rate: Relative Performance Channel Maximum Maximum Bandwidth Data Rate bps/Hz 802.11a 20 MHz 54 Mbps ~2.7 bps/Hz 10, 20 MHz; 802.16a 1.75, 3.5, 7, 14 MHz; 63 Mbps* ~5.0 bps/Hz 3, 6 MHz802.16a is designed for metropolitan performance
Coverage 802.11 802.16 Optimized for indoor performance Optimized for outdoor NLOS performance Standard supports mesh network topology No mesh topology support within ratified standards Standard supports advanced antenna techniques 802.16 is designed for market coverage
Will WiMAX displace WiFi? WiMAX will not replace WiFi completely, but work TOGETHER Intel is currently integrating WiMAX and WiFi into a single Centrino chip. WiFi’s primary role will always be autonomous hotspot service areas (indoor and outdoor 0 ft. < cell radii <500 ft.). WiMax will ultimately replace WiFi in large-scale in commercial and public roles.
Wi-fi and WiMax Together 22
ADVANTAGES OF WIMAX Wimax Coverage Wimax High Speed Multi-functionality within Wimax Technology Potential and development Stay in touch with end user Wimax Infrastructure Wimax, cheap network Wimax Rich Features Wimax and Wifi Smart antenna and Mesh Topology
DISADVANTAGES Lack of Quality WiMAX range WiMAX Bandwidth WiMAX rich features Bad Weather Wireless equipments Power consuming Data Rate
FUTURE Anywhere, Anytime, Connectivity WIMAX offers the kind of service where you can get a connection, wherever u may be. When WIMAX is fully developed, u will no longer be limited to 300 feet within the WIFI hotspot, & u won’t have to drive around looking for a connection….
CONCLUSION WiMAX could bring broadband access into the homes and businesses of millions of people in rural and developing markets. Portable Internet a reality End-users to enjoy an “Always Best Connected”