[ath9k-devel] Disable b mode and prioritize ack on 5 GHz

[Alexander Szlezak <alex@szlezak.com>]

Hi Jouni,

Thanks for your elaborate answer.

Am 06.09.2012 12:09, schrieb Jouni Malinen:
> On Wed, Sep 05, 2012 at 05:11:23PM +0200, Alexander Szlezak wrote:
>>     - kick clients with bad rssi after some time (hostapd)
>>     - deactivate b modes (how can that be done didn't find settings for this)
>>     - slow down 2.4ghz association with acks to lure 5ghz capable devices to
>>     the available 5ghz aps
>>     - increase dtim interintervals to reduce Beacon airtime usage
>
> You can two (2) and (4) with hostapd configuration (though, increases
> DTIM period would not really have that noticeable differences; maybe you
> were thinking of Beacon interval instead).

You're right, i meant Beacon interval. I thought longer beacon interval 
on 2.4 could lure dual frequency devices into 5ghz band too. Still have 
to test it.

  (1) and (3) would require
> changes to current implementation. There are various ways of trying to
> encourage the station to another AP, but all these come at some risk of
> interop issues since some stations simply don't like being told so in
> vendor specific ways.. ;-)

hm, those changes are probably out of scope for the project I'm planning 
considered the required testing.
>
>>     What is possible and can be recommended in a setup with 6 2.4ghz aps and 4
>>     5ghz aps which I try to setup with minimum output power for spatial
>>     separation
>
> Do you know what kind of station devices are going to be there? Do you
> need to support 802.11b devices at all?

Actually not. I suspect multiple devices per user and mostly mobile 
devices which usually have low b penetration (currently 54 % iphone 
which are g compatible) in our networks. I thought maybe i reserve one 
frequency for b devices with your proposed settings.

  Do you need any long range
> connections to the these APs?

no, absolutely not, just about 20 meters in radius

  If not, I would just disable lowest couple
> of TX rates and potentially configure some channels to have HT-only
> configuration if you expect to see relatively large percentage of HT
> capable stations.

yep sounds reasonable!

Doing many of the more active load balancing tricks
> will require code changes (likely in hostapd) (and experimentation to
> verify it does not break deployed stations badly).

I will first test the other options as we probably have not enough time 
to do radical changes.

> To prevent 802.11b stations from associating: add one of the OFDM rates
> (say, 6 Mbps) into basic_rates parameter into hostapd.conf.

Ok perfect. I'll try to have Ap's equipped with that setting except for 
one for the b clients and see if the properly find it.

> To allow only HT stations, add require_ht=1 into hostapd.conf.

I'll try to do the same as above and see if I get the right clients there.

best,
Alexander

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