Abstract
Cross-layer design has been used in streaming video over the wireless channels to optimize the overall system performance. In this paper, we extend our previous work on joint design of source rate control and congestion control for video streaming over the wired channel, and propose a cross-layer design approach for wireless video streaming. First, we extend the QoS-aware congestion control mechanism (TFRCC) proposed in our previous work to the wireless scenario, and provide a detailed discussion about how to enhance the overall performance in terms of rate smoothness and responsiveness of the transport protocol. Then, we extend our previous joint design work to the wireless scenario, and a thorough performance evaluation is conducted to investigate its performance. Simulation results show that by cross-layer design of source rate control at application layer and congestion control at transport layer, and by taking advantage of the MAC layer information, our approach can avoid the throughput degradation caused by wireless link error, and better support the QoS requirements of the application. Thus, the playback quality is significantly improved, while good performance of the transport protocol is still preserved.
Highlights
Multimedia streaming over the wireless channels has been a very challenging issue due to the dynamic uncertain nature of the wireless channels [1]
Source rate control is typically adopted at the application layer to optimize the playback quality, subject to the bandwidth constraint provided by the congestion control mechanism and the QoS requirements of the multimedia application
Simulation results show that our approach can significantly improve the playback quality of the application and maintain good long-term TCP-friendliness of the transport protocol, optimizing the overall performance
Summary
Multimedia streaming over the wireless channels has been a very challenging issue due to the dynamic uncertain nature (e.g., variable available bandwidths and random packet losses) of the wireless channels [1]. Traditional congestion control for streaming multimedia usually needs to smooth their sending rate to help the application achieve smooth playback quality. This does not work all the time, because the coding complexity of the video frames may change abruptly. We extend our work in [4] to the wireless scenario, and propose cross-layer design of source rate. (1) We first extend the QoS-aware congestion control mechanism-TFRCC (TCP friendly rate control with compensation) that we proposed in [4] to better support the QoS requirements of multimedia applications, to the wireless scenario.
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