[网络领域顶会追踪系列#18][NSDI'22]cISP: 一种光速的互联网服务提供者

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cISP: A Speed-of-Light Internet Service Provider

背景

低延迟是众多交互型网络应用的需求。

挑战

然而互联网没有针对延迟做优化。

工作

探索了广域网的设计，能够以近乎真空中的光速来移动数据。

作者的cISP设计使用非常接近大圆路径的自由空间微波无线连接来增强互联网的光纤。

cISP在提供极低延迟的同时，还考虑了许多其它的实际因素，包括可用的传输塔、数据包入队等。

实验

对比在中长距离、光速下使用大圆路径，作者表明在美国和欧洲的cISP实例能实现平均其5%的延迟。

进一步地，在近乎光速的算法交易上进行的实验和在其终端上对交易数据进行的分析表明，即使在恶劣天气下，微波网络可靠地比光纤网络快。

最后，作者估计这样的网络带来的经济价值讲持续的超出它们的花销。

原文摘要

Low latency is a requirement for a variety of interactive network applications. The Internet, however, is not optimized for latency. We thus explore the design of wide-area networks that move data at nearly the speed of light in vacuum. Our cISP design augments the Internet’s fiber with free-space microwave wireless connectivity over paths very close to great-circle paths. cISP addresses the fundamental challenge of simultaneously providing ultra-low latency while accounting for numerous practical factors ranging from transmission tower availability to packet queuing. We show that instantiations of cISP across the United States and Europe would achieve mean latencies within 5% of that achievable using great-circle paths at the speed of light, over medium and long distances. Further, using experiments conducted on a nearly-speed-of-light algorithmic trading network, together with an analysis of trading data at its end points, we show that microwave networks are reliably faster than fiber networks even in inclement weather. Finally, we estimate that the economic value of such networks would substantially exceed their expense.