Jon,
this was really useful background material, especially for those of us
living in GSM 900 land (where 870 to 960 MHz are taken for various
variants of GSM).
Modern usage models for home WiFi are indeed likely to use much higher
duty cycles (consider Apple's Time Capsule product, which might do a
full backup for multiple hours, mostly limited by the bitrate
achievable over the radio). Apart from the fact that .11n has
revitalized 5 GHz usage, the only hope may be that neither the backup
software nor the MAC is not good enough to go up to 100 %.
However, I'm a bit uneasy with the following part:
802.11n has the potential to not play very fair with the
channel, and make life difficult for the rest of us. This is a good
reason for those of those with voting rights in 802.11 to stand up and
fight against this threat to the 2.4GHz band.
The .11n cat has been out of the bag for slightly more than a year now
(http://www.wi-fi.org/pressroom_overview.php?newsid=694 -- 325
approved products, more than half of the WiFi chipsets now); IEEE
politics won't stop that.
More importantly, I don't think we should use IETF lists for
attempting to kindle tensions between IEEE groups.
Gruesse, Carsten
(typing this from an IEEE 802.11n laptop to an IEEE 802.11n base
station which both won't care whether a formal standard exists)
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