In this era of Internet of Things (IoT), a variety of battery-powered devices communicate with each other or some remote gateways via wireless multihop communications. Although Wi-Fi has been shown to be of great benefit to a wide range of IoT applications due to its high data rate, high reliability, and native IP compatibility, it is inherently energy-hungry and potentially suffers from a dilemma: More (less) frequent use of Wi-Fi results in shorter (longer) delay but higher (lower) energy consumption. This dilemma becomes the major obstacle i...
