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Soon you'll have a standards-based power saving mechanism for Wi-Fi devices. Check this article:

http://www.infoworld.com/article/05/12/06/HNbatterysavingtools_1.html?source=NLC-TB2005-12-06

Joel

My point is that this isn't providing anything new. Most STAs can already go into power save mode more efficiently by flipping the Power Management bit on and off. WMM Power Save is doing exactly that. The only difference is that Access Categories, which is something that is present in WMM already anyway.

Obviously having an official standard for this is good. I am just pointing out that the method is something that most stations already use.