According to the nature of IEEE 802.11 wireless LAN, the bandwidth is shared among wireless devices. However, the bandwidth cannot be fairly shared among stations, because some users may use greedy applications which prevent other applications from connecting to the Internet. These applications are, for example, video streaming applications, download accelerators and P2P applications. Moreover, the DCF mechanism which is provided in the 802.11 MAC protocol originates the per- flow unfairness problem between uplink and downlink flows, as uplink flows usually dominate downlink flows and lead to unfair bandwidth allocation among wireless stations. In this research, we propose an adaptive bandwidth allocation mechanism to provide per-station fairness. The proposed scheme can control the wireless traffic for fairness of bandwidth allocation among stations. The bandwidth of each station can be adjusted to minimize the remaining bandwidth. The proposed scheme also covers a method to prevent domination of uplink flow which affects per-station fairness. Furthermore, the proposed scheme can be implemented on wireless access routers. Hence, in order to support legacy wireless clients, our solution can be efficiently used.