Power Requirements
One of the advantages of using DSSS is that it is important to conserve
as much power as possible with wireless PDAs and other battery-operated
remote connection devices on your wireless network. Unless you have
sufficient battery life in your device, your device may shut down after
only an hour or so of use.
The 802.11 protocol has enhanced MAC features to increase battery
life through specific power management methods. Unfortunately, power
management schemes cause difficulties with WLANs because standard
types of power management methods derive their savings from placing
the wireless device into a “sleep mode” that basically turns the unit off.
When there is no network activity for a specific amount of time, the unit
is not able to receive important data transmissions.
In order to support wireless clients that are put into sleep mode,
802.11 makes it possible for access points to include buffers designed to
queue messages. This means that sleeping clients must be awakened
every so often to receive important messages. However, access points
are allowed to trash unread messages after a certain amount of time has
elapsed so that obsolete messages do not remain on the server.
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