Wireless Local Area Networks (WLANs) based on the IEEE 802.11 technology are becoming increasingly popular and widely deployed. However, the growing need for Quality of Service (QoS) guarantees is difficult to implement in distributed systems like WLANs, where the random access protocol and the unpredictability of the wireless channel hamper their interaction with well-established architectures like DiffServ. The main contribution of this paper is the proposal of an LLC-layer algorithm that can be implemented at both Access Point (AP) and Wireless Stations (WSs). This paper outlines the proposed solution and presents a simulation study that shows the effectiveness of the new algorithm in comparison to the standard 802.11b implementation.
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