2024年3月30日发(作者：)

WMM™ Power Save

for Mobile and Portable Wi-Fi

®

CERTIFIED Devices

Wi-Fi Alliance

December 2005

© 2005 Wi-Fi Alliance. All rights reserved. Wi-Fi® is a registered trademark of the Wi-Fi Alliance.

Wi-Fi CERTIFIED™, WMM™, WPA™, WPA2™ and Wi-Fi ZONE™ are certification marks of the Wi-Fi Alliance.

Executive Summary

Wi-Fi mobile devices require advanced power-save mechanisms to offer a rich user

experience for voice, audio, and video applications. WMM (Wi-Fi Multimedia)

Power Save extends the battery life of Wi-Fi devices by increasing the efficiency and

flexibility of data transmission. It is an addition to WMM, the technology that enables

Quality of Service (QoS) functionality in Wi-Fi networks by prioritizing traffic from

different applications. WMM Power Save has been optimized for mobile devices running

latency-sensitive applications such as voice, audio, or video, but can benefit any Wi-Fi

device. WMM Power Save uses mechanisms included in the Institute of Electrical and

Electronics Engineers (IEEE) 802.11e amendment and is an enhancement of IEEE

802.11 legacy power save, which was designed for data applications. With WMM

Power Save, the same amount of data can be transmitted in a shorter time and using

fewer frames, while allowing the Wi-Fi device to remain longer in a low-power, “dozing”

state.

The Wi-Fi Alliance has announced a new certification program for WMM Power Save

driven by the market demand for converged Wi-Fi mobile devices that support voice

applications. Certification started in December 2005 and is open to any Wi-Fi device

certified for WMM. WMM Power Save certification indicates interoperability across

vendors. Furthermore, Wi-Fi CERTIFIED for WMM Power Save devices will be able to

operate in any Wi-Fi network and coexist with 802.11 legacy power-save mechanisms.

To take advantage of WMM Power Save functionality, both the Wi-Fi client and the

access point need to be Wi-Fi CERTIFIED for WMM Power Save. In addition,

applications need to support WMM Power Save to inform the client of the requirements

of the traffic they generate. This provides additional flexibility and efficiency in managing

network and power resources.

The battery life enhancements that WMM Power Save brings pave the way to a wide-

scale adoption of Wi-Fi in mobile devices. To take advantage of this market opportunity,

it is crucial for mobile device manufacturers, access point manufacturers and developers

of latency-sensitive applications to understand the functionality that WMM Power Save

offers and to support it in their products.

About the Wi-Fi Alliance

The Wi-Fi Alliance is a global, non-profit industry association of more than 200 member companies devoted to promoting

the growth of Wireless Local Area Networks (WLANs). With the aim of enhancing the user experience for mobile wireless

devices, the Wi-Fi Alliance’s testing and certification programs ensure the interoperability of WLAN products based on the

IEEE 802.11 specification. Since the introduction of the Wi-Fi Alliance’s certification program in March 2000, more than

2,000 products have been designated as Wi-Fi CERTIFIED™, encouraging the expanded use of Wi-Fi products and

services across the consumer and enterprise markets.

Wi-Fi®, Wi-Fi Alliance ®, the Wi-Fi logo, and the Wi-Fi ZONE logo are registered trademarks of the Wi-Fi Alliance; and

Wi-Fi CERTIFIED™, WMM™, WPA™, WPA2™, Wi-Fi ZONE™, the Wi-Fi CERTIFIED logo, and the Wi-Fi Alliance logo

are trademarks of the Wi-Fi Alliance.

© 2005 Wi-Fi Alliance. All rights reserved.

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