From: Marcel Holtmann <marcel@holtmann.org>
To: Olivier Le Pogam <olepogam@free.fr>,
	BlueZ development <bluez-devel@lists.sourceforge.net>
In-Reply-To: <001001c8498c$bc3491b0$0200a8c0@jester>
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Date: Fri, 28 Dec 2007 23:35:02 +0100
Message-Id: <1198881302.4455.27.camel@aeonflux>
Mime-Version: 1.0
Subject: Re: [Bluez-devel] Add 3 HCI commands / concurrent connection
	setup	question
Reply-To: BlueZ development <bluez-devel@lists.sourceforge.net>
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Sender: bluez-devel-bounces@lists.sourceforge.net
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Hi Olivier,

> > the design of AFH is to help _other_ 2.4 GHz radios to survive while
> > Bluetooth is active in the same area. It is not meant to protect it
> > against its own technology. The basics behind AFH is too play nice with
> > WiFi networks in the same area. That's it.
> 
> I have found an interesting article about this (for people who find this 
> interesting as well !) :
> 
> http://www.us.design-reuse.com/articles/5715/adaptive-frequency-hopping-for-reduced-interference-between-bluetooth-and-wireless-lan.html
> 
> Sorry to carry on theorically speaking, but in my opinion it's always good 
> to understand the underlying techniques ... do you know how AFH is 
> implemented by chips ? Is the channel blacklisting "manually" up to the 
> developper (software), or is there a built-in blacklisting algorithm 
> (hardware) ?

it is fully up to the firmware running on the Bluetooth chip. The only
chance a host stack has it to modify the channel map and even that one
can be ignored by the chip.

Regards

Marcel


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