Abstract
Wi-Fi Direct has been proposed with the purpose of enabling the connection between any two devices without requiring a wireless access point. Because of the limited battery capacity of mobile devices, it is important issue to provide an efficient energy consumption to the Wi-Fi Direct device. In order to reduce unnecessary energy consumed, Wi-Fi Direct standard defines two power-saving mechanisms: the opportunistic power-saving (OppPS) mode and notice of absence power-saving (NoAPS) mode. In this study, we propose a method to enhance the efficiency of the NoAPS mode for the transmission of multimedia video traffic. The proposed method dynamically determines the length of the awake interval long enough to guarantee the successful reception of the frame in clients with the given outage probability based on the pdf of the video frame size estimated. The shape and scale parameters of the pdf of the video frame size and the weights of all the mixture components are updated by the Expectation Maximization (EM) algorithm whenever a frame is transmitted. Furthermore, we suggest priority-based frame transmission strategy considering the inter-dependency between video frames to reduce the packet loss rate. Results show that the proposed method reduces the energy consumption and the transmission delay of Wi-Fi Direct devices compared to the existing NoAPS method.
Highlights
The wireless communication technologies such as ZigBee, Bluetooth, and Wi-Fi Direct, facilitate the mobile devices to transmit data or voice over a short distance without a wireless access point
As consumer demand increases for better video quality and improved streaming stability, Wi-Fi Direct is regarded as an excellent candidate for high-quality video transmission because it can support higher data rate and wider coverage compared to Bluetooth and ZigBee
In this article, we suggested the power-saving algorithm which dynamically adjusts the length of awake intervals according to the frame sizes
Summary
The wireless communication technologies such as ZigBee, Bluetooth, and Wi-Fi Direct, facilitate the mobile devices to transmit data or voice over a short distance without a wireless access point. In [14], the dynamic power management (DPS) scheme is defined, which utilizes the traffic pattern information of the data sender and tunes the duty cycle according to the increase in the sleep efficiency in order to decrease the number of and the length of the active windows This proposed scheme reduces the end-toend transmission delay and achieves better energy efficiency than the traditional Wi-Fi Direct power-saving scheme. We suggest an algorithm that adjusts the length of awake interval in a beacon interval using the distribution of each video frame class to enhance the energy efficiency and reduce the transmission delay.
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