[maemo-users] [maemo-users] Bluetooth stops working

From: Frantisek Dufka dufkaf at seznam.cz
Date: Thu Feb 9 10:58:54 EET 2006
Nils Faerber wrote:
> This could be a firmware bug in the WLAN module as well...
> WIFI and Bluetooth use the same frequency spectrum of 2.4GHz. Bluetooth
> usually does not interfere with WIFIsince it uses very rapid channel
> switch (up to 1200 channel switches per second).
> But if you do an inquiry the Bluetooth module will almost broadcast
> inquiry packets on all of those channels almost at once to catch modules
> in its range. The inquiry scan algorithm is quite scary ;)
> So inquiry cause a lot of noise in the 2.4GHz spectrum.
> What could happen is that the WIFI firmware does not handle
> receive/transmit faults too well. So under certain circumstance while
> doing an inquiry a WIFI packet might get messed up quite badly without
> the radio detecting a signal drop (because in fact it had a good carrier
> all the time). Probably the same fault could be triggered with a high
> traffic WIFI cell...

Yes, this looks like explanation. I hope it could be fixed in software. 
It is quite annoying when playing with bluetooth commands when I am 
ssh-ed into device over wi-fi. But it is also an issue in normal use 
cases like searching for the phone when listening to streamed music etc.


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