Abstract
Low-power devices have manifested their crucial roles in manifold green Internet of Things (IoT) applications, including healthcare, smart home, industrial sensors, and wearable apparatuses. However, to prolong the operation time of these devices, significantly enhancing the battery capacity turns out to be an intractable challenge due to the mandatory constraint of limited form factors. Achieving this goal thus inevitably relies on new designs of physical-layer (PHY)and medium access control (MAC) schemes. This desire has driven IEEE 802.11 Task Group ba (TGba) to launch the normative work of wake-up radios (WURs) since 2017. To comprehend essential knowledge of this new technical feature, in this article, we consequently offer substantial insights of IEEE 802.11ba, including the deployment scenarios, PHY operations (waveform, modulation, data rate selection, and synchronization design), and MAC operations (radio wake-up procedure, WUR duty cycle, WUR mode, channel access scheme, and the format of a MAC packet data unit). The provided insights facilitate further research and implementation of IEEE 802.11ba WUR to empower the next generation green IoT.
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