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未来的深空通信需要一个鲁棒的、有效与可靠的文件传输协议,在研究CCSDS提出的CFDP协议基础上,针对延迟NAK模式提出了一种新的分析方法。在保证吞吐量的前提下,对ARQ定时器优化设置,导出了平均文件传输时间的理论表达式。在单跳直连链路中,对不同条件下的平均文件传输时间进行了仿真与数值分析。仿真结果表明平均文件传输时间与PDU错误概率、PDU数目及单向传播时间等有密切关系。随机仿真与理论分析具有很好的一致性。
Future deep space communication needs a robust, efficient and reliable file transfer protocol. Based on the study of the CFDP protocol proposed by CCSDS, a new analysis method for delayed NAK mode is proposed. On the premise of ensuring the throughput, the ARQ timer optimization settings, derived the average file transfer time of the theoretical expression. In the single-hop direct link, the average file transfer time under different conditions is simulated and analyzed. The simulation results show that the average file transfer time is closely related to the PDU error probability, the number of PDUs and the one-way propagation time. Stochastic simulation and theoretical analysis have good consistency.