带宽优化的深空快速文件传输协议  

Fast File Delivery Protocol with Bandwidth Optimization in Deep Space Communication

作　　者：杨雷[1] 吉磊[1] 蒋文婷[1] 安建平[1] 

机构地区：[1]北京理工大学信息与电子学院,北京100081

出　　处：《北京理工大学学报》2014年第11期1191-1195,1201,共6页Transactions of Beijing Institute of Technology

基　　金：国家"八六三"计划项目(2012AA121604)

摘　　要：针对目前深空文件传输协议可靠传输服务中存在的文件传输时延较长或带宽利用率较低的问题,利用CCSDS文件传输协议(CCSDS file delivery protocol,CFDP)在延迟NAK模式下(deferred NAK)的文件传输时延随协议数据单元(protocol data unit,PDU)长度减小而递减的函数关系,通过优化文件重传阶段的PDU长度,实现高带宽利用率下的文件快速传输.理论分析和仿真结果表明,在典型的地球-火星通信场景下,本文提出的文件传输协议与CFDP协议相比可以以小于1%的通信带宽为代价缩短文件传输时延约12%,与RSFDP协议相比可以在文件传输时延增加约15%的条件下将通信带宽降低约3%.To solve the problem of long transfer delay or low utilization of bandwidth in the reliable services in deep space file delivery protocols, this paper, based on the CCSDS file delivery protocol（CFDP）with the relationship that the file transfer delay shortens with the decrease of the length of protocol data unit（PDU）, achieved the goals of reducing the transfer delay and keeping the bandwidth optimization simultaneously through optimizing the length of PDU at the stage of retransmission. The theoretical analysis and simulation results show that under the typical earth to mars communication scenario, the method presented in this paper, compared with CFDP, reduces the transfer delay by about 12% at the expense of an increase of about less than 1% in bandwidth, and compared with RSFDP, reduces the bandwidth by about 3 % at the expense of an increase of about 15% in transfer delay.

关 键 词：深空通信 重传机制 传输时延 带宽优化 

分 类 号：TN927.3[电子电信—通信与信息系统]