RFDP面向容延容断网络的可靠文件传输协议

RFDP A Reliable File Delivery Protocol In Delay/Disruption Tolerant Networks

容延容断网络是基于星际网络提出的一种异于传统网络的抽象网络模型。本文针对容延容断网络所具有的长延迟、高误码率、链路频繁中断等特点,提出了一种改进的可靠文件传输协议(RFDP)。与传统的CFDP文件传输协议相比,随着误码率和延迟的增加,RFDP性能明显优于CFDP。在误码率超过10-5的极限情况下,伴随着长延迟,RFDP性能比CFDP延迟否定确认模式和立即否定确认模式提高均超过50%。因此,RFDP适合在较高误码率和较大传输延时的受限网络条件下进行通信,尤其适合容延容断网络这种信号传输条件恶劣的极限通信环境。

Delay/Disruption Tolerant Networks （DTN）,whieh is based on interplanetary networks, are an abstract network model differ- ent from traditional networks. In this paper, an enhanced file transfer protocol, named as Reliable File Deliver Protocol （RFDP）, is proposed for DTN characterized by the long propagation delay, high bit error, frequent network partitions and so on. Compared with the traditional CCSDS File Delivery Protocol（CFDP）,the simulation results show that RFDP outperforms CFDP obviously in the case of the high bit error and long delay. In the ultimate scenario where the bit error is higher than 10^-5, the transmission time of RFDP is less than half of that of Deferred NAK and Immediate NAK of CFDP along with the long delay. Therefore the RFDP is applicable to the limited network environment, especially suitable for DTN in deplorable transmission environment.