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Research on Congestion Control Algorithm Based on XCP Protocol

Author: QuMeiRong
Tutor: YinFengJie
School: Liaoning University
Course: Computer Software and Theory
Keywords: XCP Congestion Control Late start streaming Sliding Mode Control Configuring Bandwidth
CLC: TP393.06
Type: Master's thesis
Year: 2011
Downloads: 45
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With the further development of Internet technology, fiber-optic network, G-bit network gradually on the rise, showing a modern network of high latency high bandwidth (high bandwidth-delay product networks) properties. Traditional transmission control protocol drawbacks gradually exposed more and more people on the network can not meet the requirements of quality of service, so research superior performance, adapt to high-bandwidth delay product network characteristics Agreement becoming a hot issue network research community. More representative of the agreement: HSTCP (High-Speed ??TCP), FastTCP, VCP (Variable-structure congestion Control Protocol) and XCP (eXplicit Control Protocol). Which XCP protocol uses the endpoint and intermediate routing joint work the way, has made a strong fairness, fast convergence, almost zero packet loss rate and shorter routing queue length. Based on the above advantages, XCP protocol become explicit feedback congestion control based on a standard algorithm. While the XCP protocol has many advantages as above, but there are still late start streaming fair slow convergence difficulties configuring bandwidth settings, a large difference in the case of system instability RTT and other defects. In order to further improve the performance of XCP protocol, this paper XCP protocol deficiencies has been improved, and have achieved good results. This paper first introduces several representative high-speed network congestion control protocol, and the working process of XCP protocol is analyzed in detail, pointing out the shortcomings of the XCP. Secondly, there is late start for XCP flow unfairness of the problem were elaborated and made a late start on XCP flows Quick Start algorithms. Based on the characteristics of XCP header in the packet header before using the reserved bits first new connection package labeling; efficiency controller then marked according reserved bit different to the late start of the packet stream bandwidth reservation; final fair The controller will start late reserved bandwidth allocated to flow. The algorithm under the premise of maintaining stability of the system, greatly reducing the flow converges to fair late start time. Again, the proposed XCP bandwidth of sliding mode control based compensation algorithm. Showing a modern high-speed network environment, dynamic characteristics, this paper based on sliding mode controller in a dynamic environment with strong robustness to the advantages of the XCP route by adding sliding mode controller, the application of sliding mode control theory in a dynamic network Set reasonable for XCP output bandwidth, and thus the feedback factor to compensate for the uncertainties. Source transmission rate adjusted accordingly, so that the network output is always maintain high throughput and queue length smaller. Finally, in the NS2 simulation environment for the above two points improved simulation. XCP protocol is based on the packet loss, it is only in the simulation and routing queue length link utilization compared. As can be seen from the simulation results, the improved algorithm can start to flow in a relatively short time late fair bandwidth greatly reduces the time for the convergence to the stable, and can maintain a high bandwidth utilization and lower routing queue length.

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