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基于CFDP协议中的延迟NAK型可靠传输模式,提出了一种改进方案,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,方案把整个文件传输分为初次发送与重传两个阶段,通过仿真验证了该方案的性能,确定了仅对丢失或错误的PDUs连续重传两次的策略,推算了双重传延迟NAK型模式下的平均文件传输时间,并与传统的延迟型NAK做了比较。仿真结果表明该方案在文件传输时间方面优于传统延迟型NAK模式,非常适合连接时间短、长传播时延及丢包率高的场景。
Based on the delayed NAK reliable transmission mode in CFDP protocol, an improved scheme is proposed and analyzed by mathematical modeling. A reasonable compromise between file transfer time and throughput is achieved. The program divides the entire file transfer into two stages: initial sending and retransmission. The simulation verifies the performance of the scheme, and determines that only the lost or erroneous PDUs The strategy of retransmitting twice in a row is deduced and the average file transfer time in dual-transmission delay NAK mode is calculated and compared with the traditional delayed NAK. The simulation results show that this scheme is superior to the traditional delayed NAK mode in terms of file transfer time, which is very suitable for scenarios with short connection time, long propagation delay and high packet loss rate.