A wireless AP power saving algorithm by changing operating mode and altering transmission power in IEEE 802.11 WLAN

We propose a wireless Access Point (AP) power saving algorithm, which minimizes the transmission power without decrease the transmission and carrier sense ranges. A wireless AP which is used in our algorithm checks its own original coverage periodically for whether there is a new MN or not when its transmission power is decreased. Moreover, if there is no signaling message to connect the wireless AP, it changes its operation mode wake-up to sleep. A numerical result shows that the proposed AP algorithm can reduce the total power consumption of the wireless AP approximated 17% by turning off the wireless AP when there is no MNs and adaptively altering the transmission power level when an MN is detected by receiving response during the listen state.