MAN Evolves with Wireless Standard 802.16 - Page 2

By Michael Singer

May 02, 2003

Not Your Same 'Ole Alphabet Soup
WirelessMAN will not be taking the same jumbled A-to-Z approach as 802.11, IEEE 802.16 Working Group chair Dr. Roger B. Marks told

"We are trying to avoid referring to them by their letter," he said. "At the moment we're not really going out to create something that you would sell to consumers. 802.16 is about base stations that connect the core networks as part of serious investments and it will be a different kind of business, so we don't really need to identify the separate amendments."

But there are differences between the amendments that address a carriers' individual needs.

The overall vision for 802.16 is that carriers would set up base stations connected to a public network. Each base station would support hundreds of fixed subscriber stations, probably mounted on rooftops. The base stations would then use the standard's medium access control layer (MAC) -- a common interface that makes the networks interoperable -- to nearly instantaneously allocate uplink and downlink bandwidth to subscribers according to their needs.

Conceivably, 802.16 MANs could anchor 802.11 hotspots, which serve as wireless local area networks (LANs), as well as servicing end-users directly.

However, the 10-66 GHz spectrum is strictly line-of-sight. That's where the 802.16a amendment comes in. The amendment addresses the low-frequency 2-11 GHz spectrum, some of which is unlicensed, and which allows for non-line-of-sight operation.

802.16c has also been published. That amendment relates to protocols, test suite structures and test purposes. Similarly, 802.16d focuses on fixing the errata and other protocols not covered by 802.11c.

Expected to be complete by the end of 2003, 802.16e will introduce mobility into stationary wireless. A user will be able to move about in an 802.16e coverage area and remain connected.

Navini, an Intel-funded wireless broadband vendor, is looking to 802.20 -- a WirelessMAN variant -- to provide both mobility and the ability to roam between base stations.

And while 802.16 is a backend technology, Marks says in the future, 802.16e has the capacity to be adapted for individual computers.

"One of the reasons is that might happen is that we have QOS support," Marks said. "The nice thing about 802.16 is it can handle time sensitive information like voice. Intel has been very active in the process. The talks that I've seen Intel people give have been mostly the kind of 16 and 11 compatibility."

So will we see a Centrino chipset with 802.16 embedded any time soon? Perhaps, but Intel said they haven't publicly announced any products or plans to include the technology.

And because of its carrier-grade capacity, Marks says the U.S. Department of Commerce is very interested in supporting the standard.

"They're interested in 802.16 because of the increased broadband deployment," he said.

That kind of interest is of great interest to WiMAX considering current estimates show growth of broadband access is slowing down from a 40 percent rate of growth this year to a 15 percent rate of growth in 2004.

"If there are more viable ways of deploying broadband, that is great news for us," LaBrecque said. "Most people who want broadband access want broadband access without having to worry about cable or DSL and that is where it is going for us."

Editor's note: editor Thor Olavsrud contributed to this report.

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