论文标题
（地球的边缘）复制：优化大型LEO卫星通信网络中的内容交付
Edge (of the Earth) Replication: Optimizing Content Delivery in Large LEO Satellite Communication Networks
论文作者
论文摘要
大型低地轨道（LEO）卫星网络，例如SpaceX的Starlink星座，承诺将提供低延迟，高带宽的Internet访问，并具有全球覆盖范围。作为全球互联网主链的陆地纤维的替代方案，它们有可能为数十亿个与互联网连接的设备提供服务。当前，CDNS的运营商利用了Internet的层次结构拓扑来将占有点放置在用户附近，但是当拓扑变为单个，广阔的，融合的访问和回程网络时，这种方法已不再是可能的。 在本文中，我们探讨了卫星网络本身中CDN的至上点的机会，因为它可以为用户提供更好的访问延迟，同时降低卫星互联网服务提供商的运营成本。我们提出了四种在卫星星座中选择丁香点的四种策略，这些策略通过广泛的模拟评估。在一种情况下，我们发现在卫星中复制Web内容可以将星座中的带宽使用减少93％，而不会在网络中复制的方法，而仅存储单个卫星中所有内容的0.01％。
Large low earth orbit (LEO) satellite networks such as SpaceX's Starlink constellation promise to deliver low-latency, high-bandwidth Internet access with global coverage. As an alternative to terrestrial fiber as a global Internet backbone, they could potentially serve billions of Internet-connected devices. Currently, operators of CDNs exploit the hierarchical topology of the Internet to place points-of-presence near users, yet this approach is no longer possible when the topology changes to a single, wide-area, converged access and backhaul network. In this paper, we explore the opportunities of points-of-presence for CDNs within the satellite network itself, as it could provide better access latency for users while reducing operational costs for the satellite Internet service providers. We propose four strategies for selecting points-of-presence in satellite constellations that we evaluate through extensive simulation. In one case, we find that replicating web content within satellites can reduce bandwidth use in the constellation by 93% over an approach without replication in the network, while storing just 0.01% of all content in individual satellites.
