Energy efficiency analysis of IEEE 802.11 PSM in multi-rate environments

Pack, Sangheon; Park, Hyunhee; Min, Sungman; Jang, Insun

doi:10.1109/ccnc.2012.6181119

Cited by 1 publication

(1 citation statement)

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“…First, when one station has packets buffered in AP, this station must be active until the last one is received during the entire beacon cycle. Second, the station sends frame to AP by means of the standard distributed coordinate function (DCF) procedure [12][13][14]. So, when one station occupies the channel, other stations will be in idle state until the channel becomes free.…”

Section: Energy Saving Efficiency Analysismentioning

confidence: 99%

Schedule-Aware Power Management for Energy-Efficiency Improvement in 802.11u WLAN

Zhang¹,

Du²,

Ren³

et al. 2013

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Mobile stations supporting the 802.11u standard can access WLAN automatically when they are within the coverage of the network service provided by this WLAN. To achieve this goal, the stations need to keep "on" states including idle and active all the time. However, studies have noted that the idleness of stations often lead to considerable power consumption. Although the conventional power saving mode (PSM) can provide energy saving effect to some extent, its own disadvantage leads to lower energy efficiency when the number of stations accessing the target WLAN. In this paper, we propose a Schedule-Aware PSM (S-PSM), which can improve the energy efficiency in 802.11u WLAN. Particularly, we use the Generic advertisement service (GAS) defined in 802.11u standard to broadcast the transmission schedule information and all stations switch off their radios based on this information accordingly. We introduce the Respond Contention Window to reduce the collision probability of competition channel. When there is no packet in the access point (AP), AP broadcasts the GAS frame and actives the Idle Timer. All stations will turn into sleep and AP will not send GAS frame until Idle Timer expires. Simulations have shown that our proposed scheme can significantly reduce power consumption compared with the conventional PSM.

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Section: Energy Saving Efficiency Analysismentioning

confidence: 99%