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首页> 外文会议>4th ACM workshop on challenged networks 2009 >Decoupling Congestion Control from TCP for Multi-hop Wireless Networks: Semi-TCP
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Decoupling Congestion Control from TCP for Multi-hop Wireless Networks: Semi-TCP

机译：用于多跳无线网络的TCP解耦拥塞控制：半TCP

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摘要

TCP performs poorly in multihop wireless networks and even worse if end-to-end connectivity is often broken such as in challenged networks. Lots of research has been carried out but this problem has not been solved completely. Recently, hop-by-hop congestion control originally proposed for wired networks has been applied for multihop wireless networks to significantly improve performances. We think that (i) moving congestion control down to lower layers is essential to overcome TCP problems in multihop wireless networks and (ii) in this case, it is necessary to further decouple congestion control from TCP. Such TCP only retains reliability control and is called semi-TCP henceforth. Due to using hop-by-hop congestion control, the congestion control efficiency of semi-TCP will not rely on the availability of end-to-end connectivity, which makes semi-TCP more suitable than TCP for challenged networks. Besides performance improvement, semi-TCP may further reduce overall system complexity by removing redundant congestion control and using simple congestion control rather than TCP congestion window. This paper discusses such a semi-TCP using a hop-by-hop congestion control that only slightly modifies the RTS/CTS protocol used in the IEEE 802.11 DCF. Furthermore, a solution to a deadlock problem in the RTS/CTS-based hop-by-hop congestion control is also studied. The performance of this semi-TCP is investigated in comparison with TCP-NewReno via simulation in NS2.
机译：在多跳无线网络中，TCP的性能较差，如果端对端连接经常断开（例如在受挑战的网络中），则TCP的性能甚至会更差。已经进行了很多研究，但是这个问题还没有完全解决。最近，最初为有线网络提出的逐跳拥塞控制已被应用于多跳无线网络，以显着提高性能。我们认为（i）将拥塞控制降低到较低层对于克服多跳无线网络中的TCP问题至关重要，并且（ii）在这种情况下，有必要进一步将拥塞控制与TCP分离。这种TCP仅保留可靠性控制，此后称为半TCP。由于使用逐跳拥塞控制，半TCP的拥塞控制效率将不依赖于端到端连接的可用性，这使得半TCP比TCP更适合于受挑战的网络。除了性能提高以外，半TCP还可以通过删除冗余的拥塞控制并使用简单的拥塞控制而不是TCP拥塞窗口来进一步降低总体系统复杂性。本文讨论了使用逐跳拥塞控制的这种半TCP，该拥塞控制仅对IEEE 802.11 DCF中使用的RTS / CTS协议进行了少许修改。此外，还研究了基于RTS / CTS的逐跳拥塞控制中死锁问题的解决方案。通过在NS2中进行仿真，与TCP-NewReno相比，研究了这种半TCP的性能。

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