  The increasing interest for ubiquitous networking, and the tremendous
popularity gained by IEEE 802.11 Wireless Local Area Networks (WLANs) in recent
years, is leading to very dense deployments where high levels of channel
contention may prevent to meet the increasing users' demands. To mitigate the
negative effects of channel contention, the Target Wake Time (TWT) mechanism
included in the IEEE 802.11ax amendment can have a significant role, as it
provides an extremely simple but effective mechanism to schedule transmissions
in time. Moreover, in addition to reduce the contention between stations, the
use of TWT may also contribute to take full advantage of other novel mechanisms
in the IEEE 802.11 universe, such as multiuser transmissions, multi-AP
cooperation, spatial reuse and coexistence in high-density WLAN scenarios.
Overall, we believe TWT may be a first step towards a practical collision-free
and deterministic access in future WLANs.
