[Olsr-dev] Missing ATIM frames on Android?

C. Scott Ananian (spam-protected)
Fri May 6 03:52:11 CEST 2011

Missing ATIM frame support might to be the reason why the battery runs
down quickly when using olsrd on android (see below).  Anyone
interested in doing a little traffic sniffing to try to confirm this?

---------- Forwarded message ----------
From: Ricardo Carrano <(spam-protected)>
Date: Thu, May 5, 2011 at 9:05 PM
Subject: Re: 802.11 media access algorithms

On Thu, May 5, 2011 at 6:18 PM, C. Scott Ananian <(spam-protected)> wrote:
> On Wed, May 4, 2011 at 12:07 PM, Ricardo Carrano
> <(spam-protected)> wrote:
>> Yes. The problem is that they filtered out adhoc in the user interface
>> and their hacked wpa-suplicant excludes adhoc. If you change the
>> wpa-supplicant and configure it in the command line, it works.
> It's not just that -- their power management completely fails in the
> adhoc case, so your battery runs down very quickly once you turn on
> adhoc, even if you're not using the radio a lot.  Something about the
> lack of an AP beacon?  I have to look into this.

Ok. PS (power saving) in 802.11 in infrastructure mode is coordinated
by the AP with PS-Poll and TIM frames. In adhoc, you need ATIM frames
(adhoc traffic indication messages). Maybe they are not implemented.
Sniffing the traffic would answer to that.

      ( http://cscott.net )

More information about the Olsr-dev mailing list