WLC24-2: Selective Power Management in IEEE 802.11 infrastructure WLANs

Access Point Buffer Management for Power Saving in IEEE 802.11 WLANs

“…RELATED WORK Hitherto, many power saving schemes for infrastructure WLANs have been proposed and most of them remedy the shortcomings existing in the BPM introduced in the 802.11 standard [1]. Noting that, in BPM, all the STAs having pending frames are informed by the AP at the beginning of each beacon interval, which may cause multiple STAs to compete for the channel and hence reduce the system throughput, Aste et al [8] proposed a power saving scheme that let the AP select several of the STAs with pending frames to be woken up at a time while deferring transmissions of the pending frames of the other STAs to successive beacon intervals, based on a cost function that takes power consumption and packet latency into account. Gan et al [9] presented a scheme that schedules awake times among STAs optimally such that the number of STAs competing to access the channel at the same time as well as frame loss and delay time are reduced, and they have proved that both the maximal number of STAs that are allocated in the same beacon slot and the number of the beacon slots that are allocated for the maximal number of STAs are minimal when the proposed scheme is executed.…”