适合长时延高误码率的卫星网络传输控制机制研究

项目名称： 适合长时延高误码率的卫星网络传输控制机制研究

项目编号： No.60872011

项目类型： 面上项目

立项/批准年度： 2009

项目学科： 金属学与金属工艺

项目作者： 刘锋

作者单位： 北京航空航天大学

项目金额： 30万元

中文摘要： 由于卫星系统的频谱资源十分宝贵，因此最大限度利用卫星的带宽资源，并针对链路错误和拥塞丢包进行准确判断并采取相应的处理措施增大吞吐量，在长时延条件下增强对丢包的反应能力，提高带宽利用率和传输效率，具有重要的意义。 本项目主要针对长时延、高误码、高速大容量的宽带卫星网络，分别研究长传输时延下的瓶颈链路的可用带宽估计与自适应滤波方法、从端节点来主动区分和检测拥塞/误码丢包，进而基于可用带宽估计提出改进的FAST TCP算法以及提高带宽竞争力TCP Vegas改进算法，并对SCPS-TP协议的性能进行了分析等。 项目提出适合卫星网络传输控制机制的系统方案和相应的改进TCP 传输协议，对于提高链路带宽的利用率和网络吞吐量具有重要意义。 项目研究成果在国内外期刊和会议上已发表论文5篇，其中SCI收录1篇、EI收录4篇、ISTP收录1篇（含重复收录）。相关成果申请国家发明专利4项，其中授权1项。

中文关键词： 传输控制；拥塞控制；带宽估计；长时延

英文摘要： Because spectrum resource in satellite network is very rare, it is very important to make the best of bandwidth resource in satellite network, and exactly judge packet loss reason caused by congestion or data error. Moreover, the network throughput and reaction ability to packet loss under long delay could be enhanced, and the utilization ratio of link bandwidth and transmission efficiency could be improved too. For the high speed broadband satellite network with the long delay and high bit error rate, the transmission control mechanism is investigated, and the system scheme and transmission control protocol(TCP) are proposed in detail. The main research results include available bandwidth estimation of bottleneck link, adaptive filter for RTT and ACK sample, packet loss detection and differentiation due to congestion or bit error, improved TCP algorithm based on available bandwidth estimation and some performances are evaluation and analysis. The research results provide some valuable thoughts and methods to understand TCP and are helpful to improve the utilization ratio of link bandwidth,transmission efficiency and throughout of the network. Based on our research results, five academic papers had been published in domestic and international academic periodicals and conferences. Among them, there are 1 paper indexed by SCI, 4 papers indexed by EI, and 1 paper indexed by ISTP(duplicate record included).There are 4 national invention patents proposed as well, where an invention patent is authorized.

英文关键词： transmission control;congestion control;bandwidth estimation;large delay