Will 802.11n Use TGn?
Posted on Thursday, March 17 @ 11:41:07 PST by samc
802.11 Standards
An unsourced report from WiFiNetNews says the IEEE 802.11n task group has given the TGn Sync standard 56 percent of the vote:
However, in the IEEE voting rules, that only provides provisional support.
TGn Sync must now solicit more than 75 percent of the vote for their draft to become the proposal that’s refined and eventually ratified. If they can’t achieve a 75-percent supermajority for a revision of their proposal in May—or possibly even subsequent meetings—the vote rolls back to trying to get 50 percent support for a single proposal to move forward on.
In the 802.15.3a group on ultrawideband, for instance, no proposal reached the supermajority, and the process has been stalled while individual alliances and companies have separately moved forward on developing against their own group or company standards.
The IEEE 802.11n Task Group, narrowed the remaining 802.11n proposals to two last month. Qualcomm has joined Intel, Nokia, Sony, Samsung, and others, announcing their membership in the TGn Sync club. TGn Sync is targeting the developing IEEE 802.11n WiFi "standard" for 100 Mbps WiFi. They want to be The One.
Airgo's MIMO chipset is based on the incompatible and competing WWiSE "standard", and is used in Belkin's "pre N" wireless router and the Linksys Wireless-G Router with SRX. Atheros has announced a MIMO chipset, the AR5005VL that is taking the TGn Sync route to an 802.11n "standard".
The TGn version would use two MIMO antennas, in combination with 40 MHz channels, to create a device that will provide 250 Mbit/s of bandwidth and a theoretical 175 Mbit/s of usable throughput. They claim that "beamforming" TGn has cost and power advantages, important in portable gear.
Members of the WWiSE coalition suggest this would reduce the number of available non-overlapping 802.11 channels and be illegal in some countries, for instance, Japan. Instead, it has proposed technology that uses four MIMO antennas, while sticking with the 20 MHz channels currently specified by 802.11.
DailyWireless has more on recent MIMO WiFi systems.
dailywireless.org
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