Re: How to find out the candidate APs of an associated station?

From: Jouni Malinen (
Date: 2002-09-13 16:32:07 UTC

On Fri, Sep 13, 2002 at 10:44:35AM +0200, Victor Aleo wrote:

> Do you know if it is possible to find out, from the AP side, the
> candidate APs that a station can reach? Maybe in the capabilities field?

Not without modifying each station to make this information available..

> The problem I have is that I cannot kick a station (from an AP) if I do
> not previously know if this station will be able to reassociate with
> another AP in the ESS. Of course, it is possible to do it but in my case
> I "need" to be sure that the station will be able to reassociate with
> another AP before rejecting it.

I don't think an AP can do this without resorting to some additional functionality. Anyway, it is the station that selects which AP to use, so I would recommend a bit different approach for this. Each AP could advertise its load level to associated stations and stations would then have a component that would collect these advertisements and signal quality info together and make roaming decisions based on this data. Another option would be to add a component on each station to tell scan results to the associated AP and wait for a request from an AP to change to use another AP (again, this would need an additional protocol since 802.11 does not include such functionality).

Jouni Malinen                                            PGP id EFC895FA

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