109.245.36.237: /* See also */

2025-10-18T17:11:05Z

imported>Stephan Leeds: /* Power Save Certification */ hyphen missing from compound modifier

2023-11-22T10:41:25Z

Power Save Certification: hyphen missing from compound modifier

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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.

== Power Save Certification ==
The Wi-Fi Alliance has added ''Power Save Certification'' to the WMM specification. Power Save uses mechanisms from 802.11e and legacy 802.11 to save power (for battery powered equipment) and fine-tune power consumption. The certification provides an indication that the certified product is targeted for power critical applications like smart phones and portable power devices (i.e. those that require battery or recharging such as smart phones.)

The underlying concept of WMM PowerSave is that the station (STA) triggers the release of buffered data from the [[Wireless access point|access point]] (AP) by sending an uplink [[data frame]]. Upon receipt of such a data (trigger) frame the AP releases previously buffered data stored in each of its queues. Queues may be configured to be trigger-enabled, (i.e. a receipt of a data frame corresponding to the queue acts as trigger), and delivery enabled, (i.e. data stored at those queues will be released upon receipt of a frame). Queues refer to the four ACs defined for WMM.

== See also ==
* [[802.11e]]: Quality of Service enhancements for Wi-Fi standard [[802.11b]]
* [[IEEE 802.11e-2005#APSD|802.11e-2005 APSD (Automatic Power Save Delivery)]]
* [[Sleep Proxy Service]]

==External links==
* [https://www.wi-fi.org/news-events/newsroom/wi-fi-alliance-wmm-power-save-certification-brings-robust-power-management-to Announcement about Power Save Certification]
* [https://www.wi-fi.org/discover-wi-fi/wi-fi-certified-wmm-programs WMM Power Save Knowledge Center]

[[Category:Wireless networking]]

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	==External links==		==External links==
	* [https://www.wi-fi.org/news-events/newsroom/wi-fi-alliance-wmm-power-save-certification-brings-robust-power-management-to Announcement about Power Save Certification]		* [https://www.wi-fi.org/news-events/newsroom/wi-fi-alliance-wmm-power-save-certification-brings-robust-power-management-to Announcement about Power Save Certification]

Wireless Multimedia Extensions - Revision history

109.245.36.237: /* See also */

imported>Stephan Leeds: /* Power Save Certification */ hyphen missing from compound modifier