The present invention provides a system for controlling isochronous data admission, within a WLAN system (102) that transports both isochronous and asynchronous data. The system includes an apparatus (300), functioning as an access point within a WLAN system. The apparatus comprises a memory (306) and a transceiver (312) communicatively coupled to the memory. The apparatus further comprises an access coordinator (302), communicatively coupled to the memory, and adapted to: evaluate actual access times of previous isochronous data streams, to determine projected access times needed by a new isochronous data stream, and to decide to admit or reject the new isochronous data stream based on an evaluation of the actual and projected access times.