WLAN power saving

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Created: Korpela (07 Nov 2007)

Last edited: hamishwillee (31 Jul 2012)

WLAN enabled device decides what type of scan is being used and generally WLAN SW/HW is taking care of power save protocol operations and applications do not have to care about it. But there is a still possibility to make selections/mistakes on the application development, which are power consuming.

Example: The frequency of scanning is having major impact to terminals stand-by times, so it's important to avoid performing unnecessary scans.

Main tools to improve WLAN power efficiency is on the network side.

• Office WLAN network should support Unscheduled Automatic Power Save Delivery (U-APSD) support. U-APSD is a power save scheme optimized for real-time applications transferring full-duplex data over WLAN.

• Should use the proxy ARP to help to limit the bandwidth lost to multicast and broadcast traffic.

Always-on applications have naturally big impact to power consumption, for example, push email and SIP/VoIP.

Important thing is to avoid frequent scanning, use correct DSCP (DiffServ Code Points) settings. WLAN is also very fast link so applications should try to send/receive large amounts data to reduce per byte overhead