SCPS-TP SNACK在卫星网络中的性能分析  

Performance Analysis of SCPS-TP SNACK in Satellite Networks

作　　者：李宗利[1,2,3] 孟新[1] 张胜磊 刘淑茜[5] 

机构地区：[1]中国科学院空间科学与应用研究中心 [2]中国科学院研究生院 [3]中国太原卫星发射中心 [4]北京航天飞控中心 [5]中国人民解放军63999部队

出　　处：《微计算机信息》2009年第9期115-117,共3页Control & Automation

摘　　要：由于卫星链路的特性,传统的TCP/IP不能直接应用于卫星网络中。为保证空间链路可靠的端到端数据传输,现已形成了一个标准的空间通信协议SCPS,它是TCP/IP协议的扩展,特别是传输层协议SCPS-TP。分析了SCPS协议体系结构,研究了SCPS-TP技术框架及其采用的SNACK关键技术,并以此关键技术为切入点,仿真研究SCPS-TP的性能及其与TCP协议在吞吐率及链路利用率方面的比较,得出SCPS-TP在宽带、高误码率及大时延通信环境下的性能比TCP要明显优越,更适合于大带宽时延积的卫星通信环境。TCP/IP cannot be used in the satellite network directly because of the characteristics of the satellite links. The Space Communications Protocol Standards （SCPS） has proposed to guarantee the safety of the end-to-end data transportation of the space links; it is the extension for space communication of TCP/IP, especially for the transport protocol SCPS-TP. The architecture of SCPS protocol was analyzed; the technical architecture of SCPS-TP and its key technology SNACK （Selective Negative Acknowledge-ment） were discussed. Focused on SNACK technology, the throughput and link utilization of SCPS-TP SNACK was simulated and compared to TCP. As a result, SCPS-TP SNACK performs much better in terms of throughput, link utilization in wide band, high Bit Error Rate and long round-trip delay communication environment than TCP, and it is more proper for satellite channel that has big time-delay bandwidth product.

关 键 词：SCPS-TP SNACK 卫星网络 TCP 吞吐率 链路利用率 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术] V11[自动化与计算机技术—计算机科学与技术]