A Real-Time Adaptive Algorithm for Video Streaming over Multiple Wireless Access Networks

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A Real-Time Adaptive Algorithm for Video Streaming over Multiple Wireless Access Networks

Video streaming is gaining popularity among mobile users. The latest mobile devices, such as smart phones and tablets, are equipped with multiple wireless network interfaces. How to efficiently and cost-effectively utilize multiple links to improve video streaming quality needs investigation. In order to maintain high video streaming quality while reducing the wireless service cost, in this paper, the optimal video streaming process with multiple links is formulated as a Markov Decision Process (MDP). The reward function is designed to consider the quality of service (QoS) requirements for video traffic, such as the startup latency, playback fluency, average playback quality, playback smoothness and wireless service cost. To solve the MDP in real time, we propose an adaptive, best-action search algorithm to obtain a sub-optimal solution. To evaluate the performance of the proposed adaptation algorithm, we implemented a testbed using the Android mobile phone and the Scalable Video Coding (SVC) codec. Experiment results demonstrate the feasibility and effectiveness of the proposed adaptation algorithm for mobile video streaming applications, which outperforms the existing state-of-the-art adaptation algorithms

Video streaming is gaining popularity among mobile users recently. Considering that the mobile devices have limited computational capacity and energy supply, and the wireless channels are highly dynamic, it is very challenging to provide high quality video streaming services for mobile users consistently. It is a promising trend to use multiple wireless network interfaces with different wireless communication techniques for mobile devices. Meanwhile, as video data are transmitted over HTTP protocols, the video streaming service can be deployed on any web server. However, the video quality version can only be manually selected by users and such decision can be error-prone.

 The smart phones only have limited storage space, it is impractical to maintain a very large buffer size.

 The buffered unwatched video may be wasted if the user turns off the video player or switches to other videos.

 Download typically does not support transmitting video data over multiple links.

In this paper we proposed dynamic adaptive streaming over HTTP has been proposed. In a DASH system, multiple copies of pre-compressed videos with different resolution and quality are stored in segments. We formulate the multi-link video streaming process as a reinforcement learning task. For each streaming step, we define a state to describe the current situation, including the index of the requested segment, the current available bandwidth and other system parameters. A finitestate Markov Decision Process (MDP) can be modeled for this reinforcement learning task. The reward function is carefully designed to consider the video QoS requirements, such as the interruption rate, average playback quality, and playback smoothness, as well as the service costs

 Smooth and high quality video streaming.

 Avoid playback interruption and achieve better smoothness and quality.


A Real-Time Adaptive Algorithm for Video Streaming over Multiple Wireless Access Networks


 System : Pentium IV 2.4 GHz.
 Hard Disk : 40 GB.
 Floppy Drive : 1.44 Mb.
 Monitor : 15 VGA Colour.
 Mouse : Logitech.
 Ram : 512 Mb.


 Operating system : Windows XP/7.
 Coding Language : Java 1.7
 Tool Kit : Android 2.3 ABOVE
 IDE : Eclipse

Min Xing, Student Member, IEEE, Siyuan Xiang, Member, IEEE, and Lin Cai, Senior Member, IEEE, “A Real-Time Adaptive Algorithm for Video Streaming over Multiple Wireless Access Networks”, IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS, VOL. 32, NO. 4, APRIL 2014.


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