| TCP Upload and Download Fairness over IEEE 802.11 Wired-cum-Wireless Heterogeneous Networks |
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| 作者姓名： | 任伟 金海 |
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| 作者单位： | School of Information Zhongnan University of Economics and Law，School of Information Zhongnan University of Economics and Law，Wuhan 430074 China School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China Department of Computer Science and Engineering Hong Kong University of Science and Technology Hong Kong China，Wuhan 430074 China |
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| 基金项目： | The National Science Foundation of China (No.90412010) and the Major State Basic Research Development Program of China (973 Proguam) ( No. 2003CB317003) |
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| 摘 要： | IntroductionThe interaction between wireless and wired net-works is becoming important with the growth ofdeployment of wireless networks. Gopal andRaychaudhuri1]investigated the TCP simultaneous-send problem in infrastructure mode 802.11 wirelesslocal ar…
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| 关 键 词： | 无线异质网络 TCP 上载 下载 公平性 性能评价 IEEE802.11 |
| 文章编号： | 1005-2429（2007）02-0089-07 |
| 收稿时间： | 2006-03-18 |
TCP Upload and Download Fairness over IEEE 802.11 Wired-cum-Wireless Heterogeneous Networks |
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| REN Wei,JIN Hai.TCP Upload and Download Fairness over IEEE 802.11 Wired-cum-Wireless Heterogeneous Networks[J].Journal of Southwest Jiaotong University,2007,15(2):89-95. |
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| Authors: | REN Wei JIN Hai |
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| Abstract: | A scheme of setting a limit to the TCP sending window size is proposed to improve the TCP fairness between upload and/or download flows in wired-cum-wireless networks. The goodput and delay of the upload and download TCP flows are compared to evaluate the TCP fairness for different schemes, which are the different combinations of setting a limit (64 or 4) to the sending window size and using the delayed acknowledgement (ACK) scheme or not. Extensive simulation results and analysis show that (1) for TCP download flows, setting the limit of sending window size to 4 can improve the fairness; (2) for TCP upload flows, limiting the sending window size and using the delayed ACK strategy are both beneficial to fairness; (3) for TCP download and upload mixture flows, limiting the sending window size to a small value (e.g., 4) rather than using the delayed ACK strategy, is the solution to improvement of the fairness; (4) a large delay interval (200 ms or 300 ms) does not result in improvement in fairness and performance; (5) a larger TCP packet size (1 400 B) can improve the TCP upload goodput and decrease the download goodput; in contrast, a smaller TCP packet size (560 B) can increase the download goodput and decrease the upload goodput. |
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| Keywords: | TCP fairness Wireless networks Heterogeneous networks Performance evaluation |
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