Re: [PATCH 1/2] cfg80211: Add support to set tx power for a station associated

[Ben Greear <greearb@candelatech.com>]

On 08/01/2016 02:29 AM, Johannes Berg wrote:
>
>> Sure.. First use case will be to help with the problem of legacy
>> client devices that roam across multiple APs. It is a classic
>> enterprise Wi-Fi AP problem,  often managed by a "network controller"
>> unit that is connected to all the APs.
>> The problem is how to handle seamless handoff of clients between
>> multiple  APs while maximizing the client throughput and minimizing
>> disruption of IP application services like VoIP calls and video
>> streaming. A legacy client will often  hold onto an AP association,
>> even down to 1 Mbps as it roams away. Instead,  if the AP can
>> recognise that the client RSSI (and therefore throughput) is poor, it
>> can "drop" the Tx power significantly (just to that client) such that
>> it forcesthe client to look for a better, closer, and therefore
>> higher-throughputassociation. It would "give it a kick" without
>> blacklisting it. It just needsto hold the power low for the small
>> amount of time it takes to convince it to go away.
>
> Not sure that *works* since implementations may just compare beacon
> signal strength and hold on to the AP based on that, but it does seem
> like a reasonable use case.

How is that better than just kicking the station deliberately and/or
refusing to send frames to it at all?

Thanks,
Ben

>
> How would this interact with automatic adjustment though?
>
> johannes
>
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-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com