網路傳輸控制協定流量穩定性之研究
| Autor: | Cheng, Chieh-Wen, 鄭捷文 |
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| Rok vydání: | 2011 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 99 With the rapid development of Internet technology, network bandwidth has been increased from 2Mbps to 100Mbps or even higher, and the transmission traffic has become larger and larger. The multimedia transmission needs the network with good transmission quality. In the face of rush hour, the transmission traffic will exceed the upper limit of bandwidth, causing network congestion, transmission performance degradation, or even packet loss. Currently, the TCP (Transmission Control Protocol) version used in the network is TCP Reno. In the TCP Reno, the congestion control operation consists of two phases: Slow Start and Congestion Avoidance, which includes Fast Retransmission, Fast Recovery and Timeout Retransmission mechanisms. In the algorithm for Congestion Avoidance phase, because the change magnitude for increasing or decreasing the congestion window is too large, the transmission traffic becomes instable, and then the packet loss rate increases. How to adjust the size of congestion window in accordance with network congestion conditions to reduce the packet loss rate and to improve the traffic stability becomes an important issue. To improve the stability of network traffic, a modified TCP Reno algorithm, called Smooth Congestion Avoidance (SCA) algorithm, is proposed to improve the problem of too large changes of congestion window in the original TCP Reno's Congestion Avoidance phase. The experimental results showed that the SCA algorithm can reduce the packet loss rate and increase the total network throughput by 12% and 23%, respectively. Meanwhile the stability of network traffic increase and the network performance deterioration caused by the fluctuation of congestion window is improved. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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