Wi-Fi Tethering, also known as a “Mobile Hotspot”, means sharing the Internet connection (e.g., a 3G connection) of an Internet-capable mobile phone with other devices over Wi-Fi. Wi-Fi Tethering is a popular feature on mainstream smartphones but existing implementations are a battery killer. This project aims to provide a power-efficient solution, to design a scheme which can significantly reduce the power consumption without downgrading the network performance and user experience.