Employing In-packet Segmentation with Wireless ARQ Protocols to Improve the Quality of TFRC Video Streaming
| Autor: | Jun-Nan Guo, 郭俊男 |
|---|---|
| Rok vydání: | 2008 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 96 While transmitting real-time video stream over wireless networks, the packet losses due to congestion losses and wireless errors cause the degradation of video quality. In order to reduce the network congestion while maintaining the smooth sending rate, TCP-friendly rate control is designed for multimedia services. From previous studies, it is shown that the packet length determines the tradeoff between robustness and efficiency for wireless video transmissions. The smaller the packet size, the lower the packet corruption rate. However, the small-packet transmission induces the high overhead and unfairness problem occurs when small-packet TFRC flows compete the available bandwidth with large-packet TCP flows. In this paper, we propose an in-packet segmentation scheme to transport TFRC video streams over the wireless network. The proposed scheme virtually segments the original TFRC packet into segments and utilizes the retransmissions of the wireless ARQ protocol to recover the corrupted segments. The optimal segment size is obtained based on the current channel condition to maximize the data goodput (i.e., transmission efficiency).The experimental results show that by employing the virtual segmentation technique and the segment recovery mechanism, our proposed scheme can improve the TFRC video quality while achieving the throughput fairness. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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