WiMAX Interview Questions and Answers

1 :: What frequency will WIMAX Technology use first?

The first frequency with interoperable certified product to ship was in the International 3.5 GHz bands. Today products are available at 2.5 GHz, 5.8 GHz, 2.3 GHz and 3.65 GHz. Allthough no formal product profile has been set, likely the Forum will attempt to address the 700 MHz range. There are no plans for Mobile WiMAX Technology at 5.8 GHz.

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2 :: Do I need a License for WiMAX Technology?

Determining whether or not a service provider needs a license to deliver service is not a question answerable with a simple yes or no. Many elements must be factored into the decision of whether or not to attempt to obtain a license.

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3 :: What RF Frequencies does WiMAX Technology work in?

The most recent versions of both WiMAX Technology standards in 802.16 cover spectrum ranges from at least the 2 GHz range through the 66 GHz range. This is an enormous spectrum range. However, the practical market considerations of the Forum members dictated that the first product profiles focus on spectrum ranges that offered Forum vendors the most utility and sales potential.

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4 :: What companies are involved with WiMAX Technology?

As of last count, the WiMAX Forum membership included over 500 companies with many other firms evaluating the technology as a possible fit for their business and technical models. A complete list of WiMAX Forum members can be found on its site. WiMAX Forum ™ Members.

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5 :: What is the actual throughput data transfer rate of WiMAX?

WiMAX Technology supports very robust data throughput. The technology at theoretical maximums could support approximately 75 Mbps per channel (in a 20 MHz channel using 64QAM ¾ code rate). Real world performance will be considerably lower---perhaps maxing out around 45 Mbps/channel in some fixed broadband applications. Remember however, that service across this channel would be shared by multiple customers. Actual transmission capabilities on a per customer basis could vary widely depending on the carrier's chosen customer base, which is actually an inherent strength because it can be defined by QOS in a deliberate fashion to offer different bandwidth capabilities to customers with different needs (and different budgets). Mobile WiMAX capabilities on a per customer basis will be lower in practical terms, but much better than competing 3G technologies. WiMAX is often cited to possess a spectral efficiency of 5 bps/Hz, which is very good in comparison to other broadband wireless technologies, especially 3G.

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