Investigation On An Adaptive Multi-Channel Selection Mechanism For Motion Picture Based On Transmission Quality Of Wireless Channel

With the great development of the wireless mobile communication technology, there are more and more applications on wireless networks due to their predominant extensibility and mobility. Presently, video transmission technology over wireless network has been front edge of information science technology, and it's mainly used in sampling and long distance transmission of optical motion picture in the area of local monitor. The characteristics of real-time video transmission are huge data quantity and sensitivity to the time delay. The main influence on the QoS of wired network is congestion, but on wireless network there are also other influences such as limited bandwidth, bandwidth variation and high error rate etc.This thesis mainly proposed an adaptive multi-channel selection mechanism for motion picture based on transmission quality of wireless channel. The mechanism included three parts: one was the simple resending algorithm depending on video stream encoding which can improve the reliability of wireless channel. The second was flow controlling mechanism based on packet loss rate so as to increase availability of wireless bandwidth during avoiding congestion, and make use of video quality self-adjustment in order to improve real-time ability and continuity of video stream. The last one was also the kernel. In this part mainly implemented a scheduling algorithm of wireless multi-channel on network layer which improved transmission quality and reliability.As the simulation experiments have shown, this mechanism applied to double-channel can increase linearly transmission rate of video stream, and enhances its stability.