NXG03-4: XCP-i : eXplicit Control Protocol for Heterogeneous Inter-Networking of High-Speed Networks

Abstract

XCP is a transport protocol that uses the assistance of specialized routers to very accurately determine the available bandwidth along the path from the source to the destination. In this way, XCP efficiently controls the sender's congestion window size thus avoiding the traditional slow-start and congestion avoidance phase. However, XCP requires the collaboration of all the routers on the data path which is almost impossible to achieve in an incremental deployment scenario of XCP. It has been shown that XCP behaves badly, worse than TCP, in the presence of non-XCP routers thus limiting dramatically the benefit of having XCP running in some parts of the network. In this paper, we address this problem and propose XCP-i which is operable on an internetwork consisting of XCP routers and traditional IP routers without loosing the benefit of the XCP control laws. The simulation results on a number of topologies that reflect the various scenario of incremental deployment on the Internet show that although XCP-i performances depend on available bandwidth estimation accuracy, XCP-i still outperforms TCP on high-speed links.

An IP-ERN architecture to enable hybrid E2E/ERN protocol and application to satellite networking

“…Indeed, when the TCP New Reno congestion window is smaller than the XCP congestion window, TCP New Reno throughput is slightly lower than 20Mb/s. However, when the XCP sender receives misleading congestion window in non-fully XCP-capable network, XCP might perform worse than E2E protocols [19]. When the bottleneck is ERN-capable, ERN protocols can compute the optimal congestion window.…”

“…The major problem to the deployment of such concept is that ERN protocols do not implement any mechanisms to deal with networks where non-ERN protocols (e.g., standard TCP) and non-ERN equipments (e.g., DropTail routers) are present. Indeed, it has been proved that ERN protocols can perform worse than every TCP variant in non-fully ERN-capable networks [19,20]. Therefore, ERN protocols cannot be used in heterogeneous networks and can not be gradually deployed in the current Internet.…”

Explicit Congestion Control Algorithms for Time Varying Capacity Media

“…The XCC router will then be able to create one independent virtual queue for each of its peering XCC routers. A description of such an approach is presented in [92].…”

Explicit congestion control based on 1-bit probabilistic marking

“…[26][27][28][29], explore the advantages of router-assisted congestion control for the Internet. More recently [30][31][32][33] effective solutions and alternatives to TCP end-to-end congestion control have been discussed, with algorithms based on explicit congestion signaling. One of the key aspects of these mechanisms is the capability to perform selective notifications of congestion through explicit congestion information to sources.…”