面向深空通信的DTN网络跨层包大小的优化设计  

Optimization Design of Cross-Layer Packet Sizes in Deep Space Delay/Disruption Tolerant Network

作　　者：王洋[1] 杨宏[1] 陈晓光[1] 丁凯[1] 

机构地区：[1]中国空间技术研究院载人航天总体部,北京100094

出　　处：《宇航学报》2017年第5期533-541,共9页Journal of Astronautics

基　　金：载人航天领域预先研究项目(020401)

摘　　要：基于延迟/中断容忍网络中束协议/利克里德传输协议(LTP)栈,提出一种用于深空通信的跨层包大小的优化方案。该方案可以根据信道误比特率、文件大小、信道传播时延和链路数据速率等条件得到最优的束大小、LTP块大小和LTP段大小,最小化深空通信中的文件传递时延。文中针对跨层包大小对文件传递时延的影响进行了分析,并且给出了跨层包大小的优化方案。同时,仿真并分析了信道误比特率、文件大小、信道传播时延和数据速率对最优的LTP段大小的影响以及跨层包大小优化方案所带来的性能增益。理论分析和仿真结果表明,在深空通信环境中,该优化方案可以根据特定的空间任务和环境特性优化跨层包大小,相比于未优化跨层包大小的方案,有效地提高了网络的吞吐量。In view of Bundle Protocol/Licklider Transmission Protocol （BP/LTP） stack in delay/disruption tolerant network （DTN） , a cross-layer packet-size optimization scheme is proposed in deep space communications. The optimal bundle size, LTP block size and LTP segment size are obtained to minimize the file delivery time in deep space communications, based on the channel bit error rate （ BER）, the file size, the channel propogation delay, and the link data rate. The effect of the cross-layer packet sizes on the file delivery time is analyzed, and the cross-layer packet-size optimization scheme is presented. Meanwhile, the impact of the channel BER, the file size, the channel propogation delay, and the link data rate on the optimal LTP segment size is simulated and analyzed, as well as the performance gains of the cross-layer packet-size optimization scheme. The theoretical analysis and simulation results indicate that the proposed scheme can optimize the cross-layer packet sizes under certain space missions and circumstances, which effectively improves the throughputs over the scheme with the common packet sizes.

关 键 词：延迟/中断容忍网络 束协议/利克里德传输协议栈 深空通信 优化跨层包大小 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]