Setting Minimum RSSI threshold for client connections

Hi,
We are deploying a new wireless network for guest users of private lounges at airports, using a 5508 WLC and 3501 AP’s. The SSID uses open L2 authentication with a web auth passthrough login splash page.
We require preventing people outside these private areas to connect to the SSID, and we would like to do so by only allowing clients to connect if they exceeed the minimum RSSI guaranteed in the private areas (i.e. prevent connections below a certain level, such as -70dB). We tried to configure this by settings several parameters, for example the “Minimum RSSI” under “Client Roaming” without achieving the desired effect.
Can a minimum RSSI be set up so clients would not connect unless they receive the minimum specified signal level? If so, can anyone please advise how to set this up?
Many thanks in advance for your expert advise…
Regards
Luis A

This one is an idea (but costly): Faraday cage (aka Faraday mesh or Faraday shield)
If installed correctly, your wireless signal will be inside the four walls (don't know if you have those glass doors but if you do ...).
Out of curiousity, WHY did you purchase 3501 instead of 3502?
I mean 3501 means it only has 802.11b radio. And 802.11b is long range and high penetration rates compared to 802.11a radio.
Lower the PHY rate ... 1 meg PHY rates travel VERY far. If you disable 1,2,5,11,-- all the way up to 24 or so .. you will need to be right on top of the AP. 20 feet or so..
What about clients with old portable devices? That's a risk.

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