January 19, 2006 6:10 PM PST

Faster Wi-Fi standard gets draft approval

A correction was made to this story. Read below for details.
A faster Wi-Fi standard appears to be about a year away, after a task group unanimously approved a proposal for an update to the 802.11g standard.

The 802.11n task group of the Institute of Electrical and Electronics Engineers approved the first draft of the new standard at a meeting in Hawaii on Thursday. Passage of the draft required 75 percent of the group to approve, but the final vote was 184 to 0, with four abstentions. Final ratification of the standard is not expected until next year, and several revisions are expected to take place before that final standard is ratified.

802.11n will allow notebook users to connect to wireless access points at much faster speeds than currently available with 802.11g technology. It will use a technology called MIMO (multiple-in, multiple-out), which allows the chips to use multiple antennas that can each handle more than one data signal at a time. This is expected to improve the range and throughput of 802.11n products to the point where they should be able to send video content around a house without interrupted playback. Products with 802.11n chips will be able to work with older 802.11a/b/g products at their slower speeds.

The draft standard is similar to the one proposed late in the evaluation process by the Enhanced Wireless Consortium, which consists of companies such as Broadcom, Intel and Linksys. The EWC made a proposal for the 802.11n standard just as two other groups were preparing to merge their competing proposals for the final standard last October.

Broadcom announced Thursday that it was immediately shipping a new group of Wi-Fi chips, called Intensi-Fi, that is compatible with the draft standard. The company claimed the new chips could provide data rates up to 300M bps (bits per second), although real-world speeds are generally lower.

Broadcom also claimed that the Intensi-Fi chips would be compatible with the final version of the 802.11n standard through firmware upgrades to products using the chips. This touched off a heated rebuke from Airgo Networks, which already makes chips that use the MIMO technology at the heart of the 802.11n draft standard.

"The only event that consumers can count on to guarantee compatibility is Wi-Fi Alliance certification," Greg Raleigh, chief executive officer of Airgo, said in an interview Thursday.

Usually the IEEE and the Wi-Fi chip vendors reach a point in the draft revision process where everyone feels comfortable that the final standard will not change much further, Raleigh said. At that point, the Wi-Fi Alliance starts preliminary testing of wireless clients and access points, and Airgo will be ready with products that will help kick off that testing, he said. Those products will be upgradeable to comply with the final standard through a software download.

Broadcom believes it has designed its Intensi-Fi chips in such a way that products with the chips will be upgradeable with software no matter what twists and turns the draft proposal takes on the final road to ratification, a Broadcom spokesman said. The company is not guaranteeing that compatibility, however, he said.

Consumers should be wary when purchasing any wireless device that does not bear the stamp of the Wi-Fi Alliance, said Will Strauss, principal analyst with Forward Concepts.

If a home user has two draft-standard chips on both ends of their network, they'll get the advertised performance, Strauss said. But if they try to take a notebook with one of those chips to a coffee shop that's using a Wi-Fi Alliance-certified 802.11n access point, they might not get the advertised performance, he said.

Chipmakers that release silicon based on draft standards are essentially making a bet that their products will need only software upgrades to the final standard, Strauss said. That strategy allowed Broadcom to jump out to an early position as a preeminent supplier of 802.11g chips, he said.

If it works, the chipmaker has a jump on larger competitors such as Intel, which is forced to wait until the final standard is released because of the scope of its Centrino marketing campaign, Strauss said. But if it doesn't, any chipmaker that comes out with pre-certification products will bear the wrath of their customers, he said.

The Wi-Fi Alliance is expected to begin certifying products in early 2007, Airgo's Raleigh said. Final ratification is expected to follow soon after, he said.

 
Correction:Due to a reporting error, the date that the Wi-Fi Alliance would begin to certify products for 802.11n was misstated in the original story in a quote by Airgo's Greg Raleigh. Raleigh said the process will start in early 2007.

4 comments

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Speed, but what about range....
The speed improvement sounds interesting, but what I 'd like to see is an increase in range. Because it would only be able to get this claimed 300mbps when it's right beside the box, but I bet with distance the speeds sharply decrease. Currently I'm using this 54mbps router in the middle of the house, and when I go to the backyard or rooms far away from the centre of the house, I get like 2mbps with signal strenght of Very Low.

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Posted by Roman12 (214 comments )
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MIMO
MIMO is supposed to increase range to about 2X in relatively open areas, and upo to 5X in areas with lots of obstructions. That's for a fixed speed, so you should be able to get 10mbps at 5X the distance you used to get 10mbps inside a building. MIMO is available today in what's called pre-n devices, but it's usage will explode with the launch of 802.11n.
Posted by Hernys (744 comments )
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Are you sure about 802.11a compatibility
Seeing how it's .11a uses a different frequency, it would be hard to make things compatible without multiple sets of antennas. I actually have some .11a cards that essentially became useless, but with .11n support I might just keep them...
Posted by sanenazok (3449 comments )
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I was surprised, too
But the Wi-Fi Alliance's Web site says that 802.11n was designed to be backward compatible with all three.

<a class="jive-link-external" href="http://www.wi-fi.org/opensection/pdf/802.11n_q_a.pdf" target="_newWindow">http://www.wi-fi.org/opensection/pdf/802.11n_q_a.pdf</a>
Posted by Tom Krazit (436 comments )
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