Initial automatic channel selection implementation
proski at gnu.org
Tue May 24 13:04:56 EDT 2011
On 05/24/2011 12:44 PM, Cristian Ionescu-Idbohrn wrote:
> On Tue, 24 May 2011, Pavel Roskin wrote:
>> Speaking of channels, I think only some channels should be eligible for
>> automatic selection (that would be 1, 6 and 11 in the 2.4 GHz range).
> May I ask what the rationale behind that may be?
That's a safe distance between channels. That's why channels 1, 6 and
11 are used more often than others.
Our algorithm make select, say, channel 3. That may be the most quiet
channel at the moment. We may use absolutely the best algorithm to
determine that. However, it is likely that APs operating on channels 1
and 6 would eventually appear in vicinity, and out AP would interfere
with both of them instead of just one of them.
Using a car analogy, consider channels 1, 6 and 11 like lanes on a
highway. Using other channels would be like driving between lanes. It
may seem safe, but only in absence of other traffic.
It's possible that the list of autoselectable channels could be country
specific. I would hate to add complexity to CRDA. Hopefully we could
device a simple algorithm to find the autoselectable channels based on
the CRDA data.
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