I am 1242 LAP, with 2 controllers. Everything is operating fine. but the signal of the AP is weack eventhough i am very close to the access point. I have 24 antennas for 8 access point. All of them operate on 2.4GHz, I tried all possible intallation of of the antennas, but still the problem persist.
I agree. Sounds like you have too many access points for your area, and same channels and cells are overlapping. Your controller will adjust signal strength, but it can only go so low. If that lowest power setting still gives too much signal, you have too many APs. Recommend a site survey to determine your actual signal propagation. Bottom line is that your card is staying sticky to an AP it was connected to, rather than choosing the stronger nearby signal. Another thought - is this a multi-floor install? If so, your card may be attaching to an AP on a floor above or below.
Are these access points operating on different channels? Interchange the 3 non-overlapping access points between them. Also check the controllers power output settings. Because they are so close together your controller may be dimming the power to avoid overlap but it obviously isn't doing enough.