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IEEE 802.11ax as the newest Wireless Local Area Networks (WLANS) standardbrings enormous improvements in network throughput, coverage and energyefficiency in densely populated areas. Unlike previous IEEE 802.11 standardswhere power saving mechanisms have a limited capability and flexibility,802.11ax comes with a different mechanism called Target Wake Time (TWT) wherestations (STAs) wake up only after each TWT interval and different STAs canwake up at different time instance depending on their application requirements.As an example, for a periodic data arrival occurring in IoT applications, STAcan wake up by following the data period and go to sleep mode for a much longertime, and STAs with high traffic volume can have shorter TWT interval to wakeup more frequency. Moreover, as multi-user transmission capability is added to802.11ax, multiple STAs can have the same TWT interval and wake up at the sametime, and hence there is a great opportunity to have collision-freetransmission by scheduling multiple STAs on appreciate TWT intervals to reduceenergy consumption and also increase network throughput. In this paper, weinvestigate the problem of STAs scheduling and TWT interval assignment togetherto reduce overall energy consumption of the network. We propose an algorithmthat dynamically selects STAs to be served and assigns them the most suitableTWT interval given their traffic and channel conditions. We analyze ouralgorithm through Lyapunov optimization framework and show that our algorithmis arbitrarily close to the optimal performance at the price of increased queuesizes. Simulation results show that our algorithm consumes less power andsupport higher traffic compared to a benchmark algorithm that operates randomlyfor TWT assignment.

Joint optimization of TWT mechanism and scheduling for IEEE 802.11ax