With the rapid growth of Internet of Things (IoT), gateways are being widely deployed and constantly deliver data traffic to their surrounding IoT devices, referred to as gateway-to-device or G2D communications. As the most commonly-accepted wireless technology, WiFi has been recommended for G2D communications due to its high data rate, high reliability, native IP compatibility, and good reusability of existing infrastructures. However, WiFi is inherently energy-hungry and thus could potentially shorten the lifetime of battery-powered IoT devic...
