地月通信链路传输协议的研究与性能分析

从传输层和应用层2个角度对空间信息传输中地月通信链路可靠传输协议进行研究，基于OPNET软件开发CCSDS协议进程级模块。针对地月骨干链路场景配置TCP 、SCPS-TP、CFDP/UDP和MDP/UDP 4种可靠传输方式，并进行协议仿真与性能分析。实验结果表明，在长传播延迟、高误码率和高度不对称性前/返向信道速率的链路上，SCPS-TP协议失去了TCP增强优势，MDP协议也表现一般，而CFDP协议的可靠传输模式能较好地适应于这种环境。

Study and Performance Analysis of Transport Protocol over Cislunar Communication Links

This paper concerns the study of reliable transport protocols employed in cislunar telecommunication environments from the two perspectives of transport layer and application layer. Based on OPNET software, CCSDS process-level modules are developed. Four kinds of reliable transport mechanism including TCP, SCPS-TP, CFDP and MDP are configured, and protocol emulation and performance analysis are conducted. Experimental results show that, with the long propagation delay, high error rate and a high degree of asymmetry in front/back to the channel rate of the links, SCPS-TP losts the advantage of TCP performance enhancement, MDP is in general, while the CFDP reliable transmission protocol model can well adapt to this environment.