I have a setup in which 2 AP shares the same BSSID (MAC address) so the mobile station (MS) detect only one AP but the truth is that the MS can associate with the 2 AP simultaneously, the MS detect one association but each AP asociates with the MS (OK I know that 802.11 don't consider that). I managed to received duplicated frames from both APs. Two questions arise from this setup:

1.- If the two AP are visible to each other and to the MS (no hidden node problem) then the CSMA/CA will work normally even if the APs have the same BSSID? i.e if AP1 send a frame to the MS then AP2 will perform the carrier sensing function and therefore will wait for the next DIFS and perform the backoff algorithm for contention-based data?

2.- If the MS is facing the hidden node problem i.e MS is between AP1 and AP2 but AP1 can't hear AP2 then can I use the RTS/CTS clearing technique to reduce collision in AP UNDER THIS SETUP?

I'm considering the following:

- 802.11g technology

- Downstream data (If you can give me tips for upstream data it would be good too!)