Elliot introduced additional changes early Wednesday morning.

"I've remapped the channels and frequency bands for all the APs on floors 2-33," he emailed his IETF colleagues. "This is a radical change, so please let me know how it works for you now."

Elliot noted that France lets Wi-Fi use channels 1-13 in the 2.4 GHz band. "As three channels are very limiting in a very 3D structure, like this hotel, I've chosen to go with 4 channels, using 1, 5, 9, and 13," he said. "This is a layout that is well respected by others, and one [that] we've considered using at the IETF on numerous occasions--and very similar to what we used in Hiroshima. You get a slight bit more of cross-channel interference, but the additional channel is worth it, especially in this hotel's environment."

Each floor now has approximately two access points on each of these four channels, with the channels staggered on adjacent floor. That design maximizes the distance between access points on the same channel. "I hope this will significantly improve the coverage in some rooms that had marginal or no signal while also improving the signal to noise ratio for all," he said

In addition, he switched a couple of the single-radio Colubris access points on each floor from 2.4 to 5 GHz, which would let at least laptops make use of one of four channels on the much less crowded band.