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Published at November 26

A Primer on AP Power Save in Wi-Fi 8: Overview, Analysis, and Open Challenges

cs.NI

Released Date: November 26, 2024

Authors: Roger Sanchez-Vital, Andrey Belogaev, Carles Gomez, Jeroen Famaey, Eduard Garcia-Villegas

Arxiv: http://arxiv.org/abs/2411.17424v1

Refer to caption

AP PS mechanism	Summary	Signaling	Energy saving	Schedule duration	Backward compatibility
Scheduled	Scheduling of SPs with different operational modes	Reuse TWT signaling, presence requests	High	Long-term	Low since legacy devices require AP to be in awake state
Dynamic (DPS)	On-demand switching of capabilities	ICF with intermediate FCS and padding, ICR	Medium	Short-term	Limited due to unfairness, because legacy devices use mostly LCM
Semi-Dynamic (SDPS)	DPS modification, when AP can defer switching. Can be combined with scheduled.	Same as for Scheduled and DPS, LL flag added to ICF	Medium to high	Both short and long-term	Limited due to unfairness and inability to for the AP to switch into doze state
Cross-Link	On-demand wake-up other links via an active link of MLD AP	Cross-Link wake-up (reuse AP assistance request)	High	Short-term	High since communication via active link is available
Wake-up Radios (WuR)	On-demand wake-up of primary radio via companion WuR	IEEE 802.11ba signaling	Very high	Short-term	Low since WuRs are not supported by legacy devices
STA offloading	Offloading of STAs to other APs to save energy	Seamless roaming signaling via Multi-AP Coordination	High	Long-term	High through legacy handover procedures (although with worse performance)