Access To Wireless Lan

Hi,
Let Us Assume That We Have Tow Access Point AP1 And AP2 In The Same Area That Each Access Point Work At The Same Channel (Such Channel 3 For Example) And There Is Tow Mobil Station S1 And S2 So S1 Associated To AP1 And S2 Associated To AP2 . Now Can This Tow Station Transmit At the Same Time To It’s Own Access Point Without Collision ?

I’m Sorry For My Poor English