天地一体化信息网络协议体系与传输性能简析

[摘要] 对于中国天地一体化信息网络（ISTIN）的构建，针对可能采用的两种网络协议体系，即传输控制协议（TCP）/IP和容迟容断网络（DTN），以3颗地球静止轨道（GEO）卫星组成天基骨干网络为例，分析了3种基本传输场景下的主要挑战，通过计算机半实物仿真开展了协议传输性能的测试。试验结果表明：尽管DTN协议与TCP-Hybla改进协议能够获得较好的传输性能，由于时延与误码率（BER）等参数存在较大的动态范围，没有一种协议能够在所有传输场景下保持传输性能始终最优。天地一体化信息网络协议体系的性能仍有待进一步提高。

[关键词] ISTIN；协议；传输性能

[Abstract] Two different network architectures are discussed in this paper: transmission control protocol (TCP)/IP and delay-and disruption-tolerant networking (DTN) for future integrated space and terrestrial information network (ISTIN) in China. A simple space backhaul network consisted of 3 geostationary orbit (GEO) satellites is analyzed and categorized as 3 basic transmission scenarios, in which the challenges for network architecture are stated. Computer emulations are conducted to study the transmission performance of different protocols. The results show that although TCP-Hypla and DTN both have better performance compared to the classical terrestrial TCP, with high dynamic delays and bit error rate (BER), no protocol is always optimal in transmission performance throughout different scenarios. The performance of network architectures of ISTIN should be improved further.

[Keywords] ISTIN; network protocol; transmission performance