Re: [RFC PATCHv3 0/2] mac80211: cfg80211: Roam trigger support

["John W. Linville" <linville@tuxdriver.com>]

On Wed, Mar 17, 2010 at 03:01:15PM +0200, Juuso Oikarinen wrote:
> To implement good performance WLAN roaming, it is not sufficient to start
> scanning for other available AP's only after the currently serving association
> is lost.
> 
> The entity controlling the roaming will need to get indication of a
> deteriorating WLAN connection in order to start preparing for roaming already
> before the serving association is lost. This way, it can roam to a better AP
> perhaps even before the serving association becomes too bad in quality.
> 
> These patches propose an implementation facilitating this using a simple RSSI
> threshold and hysteresis approach.
> 
> These patches add a nl80211 interface for simply configuring a rssi threshold
> and hysteresis value to facilitate very basic connection quality monitoring.
> 
> For the triggering, these patches currently rely on HW support, host based
> triggering is not implemented, but could be added later if needed.
> 
> These patches have been tested with the wl1271 driver.
> 
> Thanks in advance for your comments and suggestions.
> 
> Juuso Oikarinen (2):
>   cfg80211: Add connection quality monitoring support to nl80211
>   mac80211: Add support for connection quality monitoring

Any idea what other hardware (besides libertas) supports this concept?
Do you anticipate adding a host-based implementation to mac80211?

Is RSSI really a useful enough indicator for this function?
Will applications actually use it?

John
-- 
John W. Linville		Someday the world will need a hero, and you
linville@tuxdriver.com			might be all we have.  Be ready.