Design And Implementation Of Congestion Control Strategy In Video Transmissionfor Wireless Multi-Mode Network

In recent years, with the rapid development of communication network, wireless multimode gateway which has a variety of means of communication and flexible facilities layout become a focus of research in the fields such as environmental monitoring and emergency communication. At the same time, people’s demand of video services is increasing, while the networks based on multi-mode wireless gateways and traditional networks vary greatly. As a result, it is urgent to solve the congestion control problem in video transmission of the wireless multi-mode gateway.This thesis designs and implements a congestion control strategy for the multi-mode wireless gateway that suits for video transmission based on the research and analysis of congestion control. We implement the congestion control function by two aspects, video transmission rate control and video transmission buffer control. We implement the video transmission rate control by using the improved TFRC model, while ensuring that the UDP connection and TCP connection are abled to fairly sharing the network bandwidth, and the video transmission buffer control that by adjusting the UDP buffer and video transmission skipped frames. Finally we establish the prototype video transmission system that based on the congestion control strategy in the Linux system on ARM platform to test the feasibility of the congestion control strategy and the effect on evaluation results shows the strategy is effective.