Routers-assisted congestion control protocols, also known as Explicit Rate Notification (ERN) protocols, implement complex algorithms inside a router in order to provide both high link utilization and high fairness. Thus, routers assisted approaches overcome most of the end-to-end protocols problems in large bandwidth-delay product networks. Today, routers-assisted protocols cannot be deployed in heterogeneous networks (e.g., Internet) due to their non-compliance with current network protocols. Nevertheless, these approaches can be deployed in satellite networks in the context of splitting PEPs. In this work, as routers-assisted protocols can use TCP algorithms to enable reliability, we aim at understanding and providing a detailed view of the impact of such algorithms on the performance obtained by routers-assisted protocols over satellite links. In particular, we both study XCP and P-XCP proposals over long delay, lossy and asymmetric links and propose a ns-2 implementation of the P-XCP protocol to the satellite community. To the best of our knowledge, this study is the first one which tackles the impact of TCP internal mechanisms on top of XCP protocol. Our main conclusion is that TCP New Reno Slow But Steady variant on top of P-XCP is to date, the most optimal configuration for satellite proxies.ud
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机译:路由器辅助的拥塞控制协议,也称为显式速率通知(ERN)协议,在路由器内部实现复杂的算法,以提供高链路利用率和高公平性。因此,路由器辅助方法克服了大带宽延迟产品网络中的大多数端到端协议问题。如今,由于路由器辅助协议不符合当前的网络协议,因此它们不能部署在异构网络(例如,因特网)中。尽管如此,在拆分PEP的情况下,可以将这些方法部署在卫星网络中。在这项工作中,由于路由器辅助协议可以使用TCP算法来提高可靠性,因此我们旨在了解并详细介绍此类算法对卫星链路上路由器辅助协议所获得的性能的影响。特别是,我们都研究了长时间延迟,有损和非对称链路上的XCP和P-XCP提议,并向卫星社区提出了P-XCP协议的ns-2实现。据我们所知,本研究是第一个针对XCP协议之上的TCP内部机制的影响的研究。我们的主要结论是,迄今为止,P-XCP之上的TCP New Reno Slow但Steady变体是迄今为止卫星代理的最佳配置。
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