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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。
Based on the delayed NAK reliable transmission mode in the CFDP protocol, this paper proposes an improvement proposal and analyzes the mathematical model. A reasonable tradeoff between file transfer time and throughput is proposed. It is suggested that the entire file transfer be divided into two phases: initial sending and retransmission. By adopting a strategy of retransmitting only lost PDUs twice consecutively, Average file transfer time in NAK mode. The correctness of this suggestion is verified by stochastic simulation. The simulation results show that this method is very suitable for the scenario of long distance, high packet loss rate and short link time.