Wireless Multimedia Extensions (WME), also known as Wi-Fi Multimedia (WMM), is a Wi-Fi Alliance interoperability certification, based on the IEEE 802.11e standard. It provides basic Quality of service (QoS) features to IEEE 802.11 networks. WMM prioritizes traffic according to four Access Categories (AC) - voice, video, best effort, and background. However, it does not provide guaranteed throughput. It is suitable for simple applications that require QoS, such as Voice over IP (VoIP) on Wi-Fi phones (VoWLAN).
WMM replaces the traditional Wi-Fi DCF distributed coordination function for traditional CSMA/CA wireless frame transmission with EDCF, Enhanced Distributed Coordination Function, which according to version 1.1 of the WMM specifications by the Wi-Fi Alliance, defines four Access Categories (AC_BK, AC_BE, AC_VI, AC_VO) labels, for the EDCA Enhanced Distributed Channel Access parameters that are used by a WMM-enabled station to control how long it shall set its TXOP Transmission Opportunity, according to the information transmitted by the access point to the station, and is implemented for wireless QoS between over RF media.
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