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The IEEE 802.11e MAC for Quality of Service in Wireless LANs

Next-generation Wireless Local Area Networks (WLANs), originally developed as an extension of the wired-LANs, are expected to become a widespread technology for the deployment of multimedia services over hot-spots and home-networking environments. To this extent, modifications of the current IEEE 802.11 MAC layer are required, in order to support real-time services as well as best-effort Web browsing and data transfer applications. The IEEE 802.11 Task Group E is working on a draft proposal for a QoS-aware MAC protocol that considers several service differentiation mechanisms, whose effectiveness is still under investigation. In this work, we have implemented a system simulator for an 802.11 WLAN, with 802.11a PHY and 802.11e MAC, while considering in great detail the specifications given in the draft, in order to evaluate the capability of the various 802.11e QoS mechanisms to support voice, video and data applications in specific hot-spot and home-networking scenarios.