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In this paper we evaluate an algorithm to distributing resources provided by the access point at the MAC layer in wireless networks. We consider a TDMA/FDD-based mechanism. System model is designed and tested for a wireless ATM networks architecture. In fact, the QoS characterising ATM technology provides the ability to well transmit multiple traffic types and treat every one according to some generic parameters. The basic idea used in this work is to provide slots reassignment, and to dynamically adjust present parameters. Simulation tests show that developed algorithms provide better results and permit to decrease blocking probability for new connections, particularly to CBR connections.