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Explicit congestion control method based on bandwidth estimation in high-bandwidth delay network

A bandwidth estimation and delay network technology, applied in the field of network communication, can solve the problems of increasing feedback overhead and reducing popularity, and achieve the effects of increasing window growth rate, reasonable packet loss rate, improving efficiency and convergence speed

Inactive Publication Date: 2011-02-02
中科博华信息科技有限公司
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Problems solved by technology

Existing high-speed protocols improve protocol performance by adding explicit feedback information, but at the same time increase the feedback overhead, greatly reducing its popularity

Method used

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  • Explicit congestion control method based on bandwidth estimation in high-bandwidth delay network

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Embodiment 1

[0051] see figure 1 , figure 1 It is a flowchart of the present invention. The process is as follows: After the TCP connection is established, observe the ECN bit of the ACK (the ECN marking method adopts the document "Xia Y, Subramanian L, Stoica I, Kalyanaraman S. One More Bit is Enough. ACM SIGCOMM Computer Communication Review, 2005, 35 (4) , 37 ~ 48." in the router-side algorithm). If the ECN is 01, it is considered that the network is in a low-load state at this time, and then enters the stage of sudden window growth, and uses the end-to-end bandwidth estimation value to calculate the congestion window size. If the ECN is 10, it is considered that the network is in a high-load state at this time, and then judge whether the bandwidth occupancy ratio exceeds the threshold according to the estimated value of the end-to-end bandwidth (the threshold is an empirical value of 0.95). If it does not exceed the threshold, it is considered that it is relatively far away from the...

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Abstract

The invention discloses an explicit congestion control method based on bandwidth estimation in a high-bandwidth delay network, which comprises the following steps of: calculating the current available bandwidth of a network by a TCP (Transmission Control Protocol) sender through observing an ACK (Acknowledgement Character) receiving interval, loading a router by a packet header ECN (Explicit Congestion Notification) 2bits information feedback network, carrying out network state judgment by the sender through explicit feedback information and estimated available bandwidth values, and adjusting a congestion mechanism according to a judgment result. The congestion is judged by combining end-to-end feedback and router explicit feedback, i.e. finer congestion information is given by using the bandwidth estimation values based on the explicit feedback of coarseness, thus an algorithm ensures high congestion feedback precision while reducing the explicit feedback overhead and improving the protocol popularization, and improves the efficiency and the convergence rate of the protocol.

Description

technical field [0001] The invention belongs to the technical field of network communication, and relates to an explicit congestion control method based on bandwidth estimation in a tail-high bandwidth delay network. technical background [0002] Different from traditional networks, high-bandwidth-delay networks have relatively large network bandwidth and round-trip delay, which makes it take a long time for the congestion window halved after traditional TCP packet loss to recover to full bandwidth utilization. This conservative Additive increase and aggressive multiplicative reduction window management strategies lead to a severe decline in TCP throughput; and the throughput unfairness brought about by RTT (RTT (Round-Trip Time): round-trip delay) differences in high-bandwidth delays become more severe under the influence. [0003] The focus of improved protocols for high-bandwidth-latency networks is on the window management mechanism, which can be roughly divided into tw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/56H04L47/27
Inventor 王建新陈洁王伟平
Owner 中科博华信息科技有限公司
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