Editing Wireless Multimedia Extensions (section)

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'''Wireless Multimedia Extensions''' ('''WME'''), also known as '''Wi-Fi Multimedia''' ('''WMM'''), is a [[Wi-Fi Alliance]] interoperability certification, based on the [[Institute of Electrical and Electronics Engineers|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 (AC_VO), video (AC_VI), best effort (AC_BE), and background (AC_BK). However, it does not provide guaranteed [[throughput]]. It is suitable for well-defined applications that require QoS, such as [[Voice over IP]] (VoIP) on [[Wi-Fi]] phones ([[VoWLAN]]).

WMM replaces the Wi-Fi DCF [[distributed coordination function]] for [[CSMA/CA]] wireless frame transmission with [[Enhanced Distributed Coordination Function]] (EDCF). EDCF, according to version 1.1 of the WMM specifications by the Wi-Fi Alliance, defines Access Categories labels AC_VO, AC_VI, AC_BE, and AC_BK for the [[Enhanced Distributed Channel Access]] (EDCA) parameters that are used by a WMM-enabled station to control how long it sets its [[Transmission Opportunity]] (TXOP), according to the information transmitted by the access point to the station. It is implemented for wireless QoS between RF media.