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arXiv cs/9809052cs.NI
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卫星ATM网络TCP/IP业务的时延和缓存需求分析与仿真

Analysis and Simulation of Delay and Buffer Requirements of satellite-ATM Networks for TCP/IP Traffic

Rohit Goyal, Sastri Kota, Raj Jain, Sonia Fahmy, Bobby Vandalore, Jerry Kallaus

摘要:

本文提出了一个研究卫星ATM网络端到端时延性能的模型。我们描述了一个卫星ATM网络结构。该体系结构提出了一个权衡之间的板上交换/处理功能和卫星通信系统的复杂性。通过卫星星座的连接的端到端延迟包括传输延迟、上行链路和下行链路地面终端-卫星传播延迟、星间链路延迟、星上交换、处理和缓冲延迟。在宽带卫星网络中,传播延迟和缓冲延迟对总延迟的影响最大。我们提出了一个分析的传播和缓冲延迟组件的GEO和LEO系统。我们将低轨星座建模为围绕地球的圆形轨道上均匀分布的卫星。一个简单的路由算法LEO系统计算本地最佳路径的端到端连接。这用于计算LEO网络的端到端传播延迟。本文提出了一个计算TCP/IP业务在ATM ABR和UBR业务上的缓冲延迟的仿真模型。我们应用这个模型来计算TCP/IP在卫星ATM网络上的总端到端延迟。

英文摘要:

In this paper we present a model to study the end-to-end delay performance of a satellite-ATM netowrk. We describe a satellite-ATM network architecture. The architecture presents a trade-off between the on-board switching/processing features and the complexity of the satellite communication systems. The end-to-end delay of a connection passing through a satellite constellation consists of the transmission delay, the uplink and downlink ground terminal-satellite propagation delay, the inter-satellite link delays, the on-board switching, processing and buffering delays. In a broadband satellite network, the propagation and the buffering delays have the most impact on the overall delay. We present an analysis of the propagation and buffering delay components for GEO and LEO systems. We model LEO constellations as satellites evenly spaced in circular orbits around the earth. A simple routing algorithm for LEO systems calculates locally optimal paths for the end-to-end connection. This is used to calculate the end-to-end propagation delays for LEO networks. We present a simulation model to calculate the buffering delay for TCP/IP traffic over ATM ABR and UBR service categories. We apply this model to calculate total end-to-end delays for TCP/IP over satellite-ATM networks.

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