Wireless Local Area Networks (WLAN) are easily deployed and require less investment. They give access to the same services as those offered by the wired networks. However, wireless terminals must share the medium of limited capacity in an equitable way without leading to a degradation of performances. A global solution for the support of QoS is proposed in this work. It aims at the improvement of the Medium Access Control (MAC) by taking into account information from both the physical and the network layers for packets differentiation scheduling. The first simulation results of the new network integrating the proposed solution shows its interest from QoS point of view. For further information, please visit this web site.