4. 802.11ah protocol energy optimization mechanisms
The CSMA/CA mechanism consumes a significant proportion of resources when there are multiple attempts to access the media. To minimize energy consumption and maximize access to a large number of stations, several mechanisms have been proposed in the standard 802.11ah .
4.1 802.11ah station operating modes
An 802.11ah station has two modes of operation. In active mode, it is continuously in a receive state, and the AP can send it frames at any time. In power-saving mode, the station is more often in a standby or sleep state.
The AP has to wait for a wake-up phase before sending it frames. When it wakes up, a station cannot access the media directly, as it may be used...
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802.11ah protocol energy optimization mechanisms
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Bibliography
Standards and norms
IEEE standard for information technology-telecommunications and information exchange between systems – local and metropolitan area networks-specific requirements – part 11: Wireless lan medium access control (mac) and physical layer (phy) specifications amendment 2: Sub 1 ghz license exempt operation. IEEE Std 802.11ah-2016 (Amendment to IEEE Std 802.11-2016, as amended by IEEE Std 802.11ai-2016), pp. 1-594 (2017)....
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