High-speed wireless begins its standardization journey

By Matthew Broersma, Techworld.com |  Mobile & Wireless

The Institute of Electrical and Electronics Engineers (IEEE) will begin sifting through a record number of proposals for a high-speed amendment to the 802.11 standard next week, but wireless chip makers are already jumping the gun with pre-standard products.

802.11n is intended to more than triple the real throughput of wireless LAN (WLAN) by focussing on enhancements to the MAC (media access control) interface, rather than the physical layer. This should mean the real throughput more closely matches the theoretical maximum rate. Currently the fastest WLAN gear has a real-world limit of 30Mbit/s, which the "n" standard will push up to at least 100Mbit/s.
As with 802.11b and 802.11g, initial demand is being driven by an insatiable U.S. consumer market for applications such as wireless video transfer in the home, but the higher bandwidth is expected to benefit enterprise applications such as voice over IP (VoIP). "Quality of service is absolutely more important than sheer bandwidth (for VoIP), but more bandwidth never hurts," said Dean Bubley, founder of Disruptive Analysis Ltd. "For one thing it makes QoS work better if there's lots of headroom."

With the proliferation of wireless devices in the office, 802.11n could also combat network congestion. "With wireless, the bandwidth is contended between multiple devices on the same access point. You don't necessarily need 200Mbit/s to each individual device, it is shared amongst users in the enterprise or on a hotspot."

Starting on Sunday, the 802.11n task group will begin to pick and choose among the 61 proposals submitted since the mid-January call for entries. The process is likely to be tortuous, with big players such as Atheros Communications Inc., Broadcom Corp., Intel Corp., Sony Corp. and Texas Instruments Inc. reportedly lined up in opposing camps, and a finished standard isn't expected until 2005 or 2006.

The standards body won't have time to sit on its hands, however, with vendors including Broadcom and Airgo Networks Inc. jumping to release proprietary products that use the technology they've submitted to the 802.11n group. Airgo said recently it had signed up four customers to its True MIMO smart-antenna technology, with two, SOHOware Inc. and Planex Communications Inc., currently shipping True MIMO-based products that are backward-compatible with existing 802.11 standards.

Airgo is not shy about calling True MIMO "pre-n", or pre-standard 802.11n, claiming the popularity of its technology in the marketplace will ensure it becomes a cornerstone of the as-yet-non-existent standard. Some industry observers agree. "Progress commercializing MIMO technology is leading the industry to adopt the technology for 802.11n," said Gartner Inc. semiconductor analyst Joseph Byrne.

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