| 无线环境下保证QoS的传输层拥塞控制机制 |
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| 引用本文： | 王晓利,纪红,乐光新,周鸿霞. 无线环境下保证QoS的传输层拥塞控制机制[J]. 北京邮电大学学报, 2005, 28(6): 26-29 |
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| 作者姓名： | 王晓利 纪红 乐光新 周鸿霞 |
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| 作者单位： | 北京邮电大学,电信工程学院,北京,100876;铁通北京分公司,网络维护中心,北京,100089 |
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| 摘 要： | 讨论了在无线信道条件恶化时，如何根据用户的服务质量(QoS)要求降低传输控制协议(TCP)发送速率的最佳参数值，在此基础上给出了2种调节TCP拥塞口的算法. 目前在无线环境下的TCP拥塞控制研究一般考虑如何提高吞吐量，出现误码丢包时不减小拥塞窗口的大小，这种设计导致了数据发送可靠性的降低. 本方案则同时考虑吞吐量要求和可靠性要求，很好地解决了无线环境下TCP吞吐量和用户的QoS要求. 仿真结果证明，该机制有效地保证了用户的QoS要求，又不会过多降低系统吞吐量.
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| 关 键 词： | 无线网络 传输控制协议 拥塞控制 |
| 文章编号： | 1007-5321（2005）06-0026-04 |
| 收稿时间： | 2005-01-25 |
| 修稿时间： | 2005-01-25 |
A Novel TCP Congestion Control Mechanism for Wireless Network |
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| WANG Xiao-li,JI Hong,YUE Guang-xin,ZHOU Hong-xia. A Novel TCP Congestion Control Mechanism for Wireless Network[J]. Journal of Beijing University of Posts and Telecommunications, 2005, 28(6): 26-29 |
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| Authors: | WANG Xiao-li JI Hong YUE Guang-xin ZHOU Hong-xia |
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| Affiliation: | 1School of Telecommunication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China;2Network Maintenance Department, China Railway Communication Company, Beijing Branch, Beijing 100089, China |
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| Abstract: | The optimal value of the TCP(transport control protocal) data sending rate was studied when the wireless channel was in bad state.Two algorithms to adjust the size of TCP CWND(congestion window) were presented.The target of most research on TCP in wireless network is to improve the throughput.So the size of CWND doesn't decrease when the packet loss is due to corruption.The result is the decrease of the reliability of TCP when the heavy packet loss rate occurs.The requirement of throughput and reliability were studied.The simulation results demonstrate that the QoS(quality of service) requirement is met and the throughput is not declining greatly. |
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| Keywords: | wireless network transmission control protocol congestion control |
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