It's up to the station. During the association a station using power
management sends a Listen Interval parameter which is measured in beacon
periods. The Beacon interval itself is tunable. Now what exactly any
particular access point uses as a default beacon interval, or any particular
station uses as default listen interval, I couldn't tell you. But the
longer the sleep time the more resources need on the access point since
frames are buffered during that period.
-Mike
Message: 2
From: "Jon Russek" <[EMAIL PROTECTED]>
To: "NYCWireless" <[EMAIL PROTECTED]>
Date: Thu, 20 Jun 2002 15:09:16 -0400
Subject: [nycwireless] Power Saving
I read this explanation of wlan power saving
http://www.80211-planet.com/tutorials/article/0,4000,10724_1015781,00.htm
l. It was informative, but it left out what I thought was a key piece
of information. Namely, when the card goes "to sleep", how long a
period of time are we talking about? Is the card sleeping for a few
clock cycles here and there, or does it mean a few minutes while the
device isn't requesting any information from the network? In normal use
(checking email every few minutes, browsing a little, etc while working
primarily offline) does powersaving make a difference in real battery
life?
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