Link adaptation-based heterogeneous network TCP congestion control method

A link adaptive, heterogeneous network technology, applied in the field of TCP congestion control based on link adaptive heterogeneous network, can solve the problems of bandwidth and delay TCP transmission performance degradation, etc.

Active Publication Date: 2015-11-04
重庆珂荧科技有限公司
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Problems solved by technology

[0006] This application solves the technical problem of TCP transmission performance degradation due to differences in link b

Method used

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  • Link adaptation-based heterogeneous network TCP congestion control method
  • Link adaptation-based heterogeneous network TCP congestion control method
  • Link adaptation-based heterogeneous network TCP congestion control method

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Experimental program
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Embodiment

[0036] In order to achieve better utilization and fairness by matching the congestion control strategy with the link state, the present invention adopts an adaptive window growth function based on an exponential function, and introduces a packet loss discrimination strategy of an adaptive queue threshold.

[0037] In order to ensure the transmission efficiency in a large BDP network, similar to BICTCP, CUBIC, and CTCP, INVS uses a convex window growth function at the beginning of the congestion avoidance phase (CAP). The convex window growth function allows the TCP sender to quickly increase the congestion window in the early stage of CAP to fully utilize the bandwidth as soon as possible, and slowly increase the window when it is close to congestion. INVS uses a convex window growth function based on an exponential function. The congestion window growth function at time t is as follows: (3 ) as shown:

[0038] cwnd(t) = cwnd sp (1-(1-β)α t ),0<α<1 (3)

[0039] In formula (...

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Abstract

The invention provides a link adaptation-based heterogeneous network TCP congestion control method. According to the method, an adaptive growth factor is introduced to an exponential type window growth function, so that window growth rate can be matched with link status, and in a packet loss differentiation strategy, an adaptive queue threshold is adopted to improve the performance of a TCP in a wireless environment; the window growth rate and a back-off strategy are adaptively adjusted according to links, so that the degradation of the transmission performance of the TCP caused by different link bandwidth, the difference of time delay and high packet loss can be avoided; a strategy for accelerating the convergence of a congestion window is adopted, and only a transmitting-end TCP needs to be modified, and therefore, the method can be gradually deployed on and applied to the Internet; and according to performance analysis and evaluation, the fairness of TCP congestion control algorithms, the utilization rate of the links and the fairness of end-to-end round-trip delay can be improved.

Description

technical field [0001] The present invention relates to the technical field of communication networks, in particular to a method for controlling TCP congestion in heterogeneous networks based on link adaptation (hereinafter referred to as INVS algorithm). Background technique [0002] With the development and popularization of communication technology, the traditional communication network has developed into a global heterogeneous Internet including various IP networks such as wired network, wireless network and satellite network. The coexistence of high-speed optical links, satellite long-delay links and various wireless links makes the link bandwidth relatively scarce in wireless links, but very sufficient in optical fiber links; end-to-end round trip delay (Round trip time, RTT) is as small as or even less than 1 millisecond in wired networks, and as large as or even more than 1 second in satellite networks; the link packet loss rate may be less than 10 on optical fiber l...

Claims

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Application Information

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IPC IPC(8): H04L12/803H04L29/06
Inventor 王志明曾孝平刘学陈礼李娟黄杰唐明春
Owner 重庆珂荧科技有限公司
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