Fundamentals of WiMAX by Jeffrey G. Andrews, Arunabha Ghosh, Rias Muhamed

By Jeffrey G. Andrews, Arunabha Ghosh, Rias Muhamed

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UHF bands: Around the world, as television stations transition from analog to digital broadcasting, a large amount of spectrum below 800MHz could become available. For example, in the United States, the FCC has identified frequency bands 698MHz–746MHz to be vacated by broadcasters as they transition to digital TV. Of these bands, 18MHz of spectrum has already been auctioned, and the remaining 60MHz is expected to be auctioned in a couple of years. The slow pace of digital TV adoption has delayed these auctions, and it is not likely that this spectrum will be usable for broadband wireless until at least 2009–2010.

5 Spectrum Options for Broadband Wireless 17 prioritized data, and best-effort data. Such 3G solutions as HSDPA and 1x EV-DO were also designed for a variety of QoS levels. Perhaps the most important advantage for WiMAX may be the potential for lower cost owing to its lightweight IP architecture. Using an IP architecture simplifies the core network— 3G has a complex and separate core network for voice and data—and reduces the capital and operating expenses. IP also puts WiMAX on a performance/price curve that is more in line with general-purpose processors (Moore’s Law), thereby providing greater capital and operational efficiencies.

We review the history of broadband wireless, enumerate its applications, and discuss the business drivers and challenges. 7, we also survey the technical challenges that need to be addressed while developing and deploying broadband wireless systems. 1 Evolution of Broadband Wireless The history of broadband wireless as it relates to WiMAX can be traced back to the desire to find a competitive alternative to traditional wireline-access technologies. Spurred by the deregulation of the telecom industry and the rapid growth of the Internet, several competitive carriers were motivated to find a wireless solution to bypass incumbent service providers.

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