| CFDP协议中延迟NAK模式的一种改进建议 |
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| 引用本文： | 梁迎春.CFDP协议中延迟NAK模式的一种改进建议[J].航天控制,2012,30(4):60-63. |
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| 作者姓名： | 梁迎春 |
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| 作者单位： | 肇庆学院电子信息与机电工程学院,广东肇庆,526061 |
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| 基金项目： | 肇庆学院精品课程建设基金资助项目 |
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| 摘 要： | 本文基于CFDP协议中的延迟NAK型可靠传输模式,提出了一种改进建议,并对其进行了数学建模分析。在文件传输时间与吞吐量之间做了一个合理的折衷,建议把整个文件传输分为初次发送与重传两阶段,采用仅对丢失的PDUs连续重传2次的策略,推算了双重传延迟NAK型模式下的平均文件传输时间。通过随机仿真验证了该建议的正确性,仿真结果表明该建议非常适合长距离、高丢包率及链路连接时间短的场景。
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| 关 键 词： | CCSDS CFDP 双重传延迟NAK 平均文件传输时间 吞吐量 |
An Improved Proposal to Deferred NAK Mode in CFDP Protocol |
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| LIANG Yingchun.An Improved Proposal to Deferred NAK Mode in CFDP Protocol[J].Aerospace Control,2012,30(4):60-63. |
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| Authors: | LIANG Yingchun |
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| Institution: | LIANG Yingchun Faculty of Electronic Information & Mechanical Electrical Engineering, Zhaoqing University,Guangdong Zhaoqing 526061,China |
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| Abstract: | An improved proposal based on the deferred NAK mode in CFDP protocol is proposed,and this proposal is modeled by means of mathematical analysis.A reasonable trade-off is made between the file delivery time and throughput.The total file transfer is proposed to divide into first sending stage and retransmission stage.The strategy is adopted,which only retransmits the missing PDUs for double times consecutively.The expected file delivery time under the double retransmission deferred NAK mode is deduced.The proposal is validated by random simulation.The simulation results show that this proposal suits the scenarios with long propagation delay,higher packet loss rate and short link connectivity time greatly. |
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| Keywords: | Consultative committee for space data systems CCSDS file delivery protocol Double retransmission deferred NAK Expected file delivery time Throughput |
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