Wireless Multimedia-Scheduled Access (WMM-SA), a
certification by the Wi-Fi Alliance, was designed to ensure interoperability between devices that support deterministic QoS for wireless LANs.
QoS over wireless is important for delivering voice and video with less jitter,
latency and
packet loss, letting businesses develop enterprisewide mobile voice strategies and manufacturers deliver hybrid cell/wireless
LAN handsets with business-grade voice quality.
The Wi-Fi Alliance, an industry group composed of leading WLAN manufacturers, certifies products. The
IEEE creates the standards on which those certifications are based.
In 2006, the Wi-Fi Alliance quietly dropped WMM-SA, which means that deterministic QoS for wireless LANs is not going to be widely implemented in the arena. Vendors can still produce products that are compliant with the IEEE 802.11e standard for deterministic QoS, but without the Wi-Fi Alliance's certification, buyers are on their own to ensure that different vendors' implementations interoperate. An additional component of the 802.11e QoS standard is expected to be implemented in a future certification, which will help the
access point manage its resources.