Dynamic Power-Saving Method for Wi-Fi Direct Based IoT Networks Considering Variable-Bit-Rate Video Traffic

Abstract

With the arrival of the era of Internet of Things (IoT), Wi-Fi Direct is becoming an emerging wireless technology that allows one to communicate through a direct connection between the mobile devices anytime, anywhere. In Wi-Fi Direct-based IoT networks, all devices are categorized by group of owner (GO) and client. Since portability is emphasized in Wi-Fi Direct devices, it is essential to control the energy consumption of a device very efficiently. In order to avoid unnecessary power consumed by GO, Wi-Fi Direct standard defines two power-saving methods: Opportunistic and Notice of Absence (NoA) power-saving methods. In this paper, we suggest an algorithm to enhance the energy efficiency of Wi-Fi Direct power-saving, considering the characteristics of multimedia video traffic. Proposed algorithm utilizes the statistical distribution for the size of video frames and adjusts the lengths of awake intervals in a beacon interval dynamically. In addition, considering the inter-dependency among video frames, the proposed algorithm ensures that a video frame having high priority is transmitted with higher probability than other frames having low priority. Simulation results show that the proposed method outperforms the traditional NoA method in terms of average delay and energy efficiency.

Keeping Connected in Internet-Isolated Locations

“…Wi-Fi Direct is a technology used in smartphones, cameras, printers and computers to make it easier for users to share content and play games using their devices. Wi-Fi Direct builds upon the traditional Wi-Fi infrastructure used in homes and offices and shares the same security and battery-saving mechanisms [9]. One device must serve as an AP, making it possible for other Wi-Fi enabled devices to connect.…”

“…The process is similar to connecting to a router. Any client can access by typing in a PIN number to access the network [9]. A device that serves as an AP is called a Group Owner (GO).…”

“…The GO is responsible for forwarding messages to the intended recipients. This places a considerable burden on the GO's resources compared to the other members of the network [9]. In situations in which devices do not have a constant power supply, this can be an issue.…”

Hardware Mechanism for Energy Saving in WiFi Access Points

“…Device-to-device ( D2D ) communications allow the minimization of the amount of time the WiFi interface of the WTs are active communicating data. In [11] the programming of beacon intervals delivery is analyzed for efficiently reducing the energy consumption of IoT devices using WiFi direct. In [12] several recommendations for energy saving are presented.…”

Distance-based Cluster Head Election for Mobile Sensing

“…Cluster Head (CH) election algorithms such as [5], [6], [7] are receiving increasing attention as they provide a mechanism for the network devices to collaboratively trade-off the number of costly transmissions they make over the cellular network with the number of less costly p2p transmissions (using a technology such as WiFi-Direct [8]). By cost we mean the burden placed on the battery of a mobile.…”