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WiMAX challenges Wi-Fi

This young tech weds the ease of Wi-Fi and the range of cellphone towers.

By Staff Writer for The Christian Science Monitor / May 11, 2009

Most computers require dongles such as XOHM’s to recognize a WiMAX signal.

Chuck Kennedy/MCT/Newscom

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When most people hear “wireless Internet,” they think “Wi-Fi.” The technology has allowed millions of computers and mobile devices to browse the Web without the snarl of cords.

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But there’s another wireless standard out there – one that’s arguably more tempting if it can get its act together.

WiMAX delivers the Web similar to Wi-Fi, but covers wide areas like a cellphone tower. While the range of a Wi-Fi router is measured in yards – enough to blanket a house or office – WiMAX can broadcast for miles.

This added range has attracted interest from local governments looking into citywide wireless networks.

Several early citywide Wi-Fi plans were abandoned because they underestimated the cost of installing enough hot spots. But with WiMAX, “Instead of needing 20 or 30 Wi-Fi access points per square mile, you need one,” says Craig Settles, an independent wireless analyst. And many cities won’t need to brainstorm creative places to stick a WiMAX antenna, because it can be attached to current cellphone towers.

Sprint rolled out a pilot WiMAX program in Baltimore last year. The network delivers average download speeds of two to four megabits per second, half the rate of cable Internet but several times faster than the 3G mobile service used by many of today’s smart phones, according to Sprint’s tests. The company plans to introduce WiMAX in 10 American cities this year and five more in 2010.

“But here’s the big problem,” says Mr. Settles. “How many iPhones have a WiMAX chip in them? None.”

In fact, barely any devices understand a WiMAX signal because it uses different frequencies from Wi-Fi. This incompatibility issue has exacerbated the normal chicken-and-egg problem that plagues new technology: People won’t buy WiMAX devices until there are more WiMAX networks, but why build the network when Wi-Fi is doing so well?

Sprint’s plan requires a proprietary antenna that plugs into laptops, similar to the early Wi-Fi cards that have since been built into computers.

If WiMAX takes off, its performance could drop off quickly, says Settles, because fewer towers means that each station needs to juggle more requests.

“Some testers were stunned at the difference in reliability as more people join,” he says. “3G has about a 90 percent uptime. WiMAX is around 70 [percent].”

In the US, WiMAX has an additional hurdle because it relies on frequencies that are regulated by the government, so companies will need to pay extra for broadcast rights.

While Settles questions WiMAX’s chances, he says there’s a middle solution. “Locally owned” service provider B2X Online harnesses WiMAX-like towers to deliver broadband Internet to Franklin County, Va. The towers, which transmit over an unlicensed frequency, allow the small company to circumvent the expensive process of laying Internet cables to rural areas.

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