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Improved AIMD congestion control method

A congestion control and algorithm technology, applied in network traffic/resource management, electrical components, wireless communication, etc., can solve problems such as waste of useful bandwidth, and achieve the effect of saving bandwidth resources

Inactive Publication Date: 2012-12-19
上海海维工业控制有限公司
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, after the multiplicative sharp decrease, the transmission speed should recover quickly with the elimination of bandwidth jitter. If it increases slowly according to the traditional additive speed, it will cause a waste of useful bandwidth

Method used

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  • Improved AIMD congestion control method
  • Improved AIMD congestion control method
  • Improved AIMD congestion control method

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Embodiment

[0022] The invention provides an improved AIMD congestion control method, the steps are:

[0023] Step 1. Determine whether the cellular network congestion is caused by a burst error or a decrease in bandwidth. If it is caused by a decrease in bandwidth, use the traditional linear increase and exponential decrease algorithm to contact the congestion, otherwise go to the next step;

[0024] Step 2. Establish a low-pass filter with a time window size of W. When congestion is detected, a timer w is started to count. When w≤W, the traditional linear increase and multiplication decrease algorithm is used to slow start and decongest. ; When w>W, start the fast search algorithm, that is, increase the increment of bit rate recovery, so that it can quickly recover to the available bandwidth. The steps of the fast exploration algorithm are:

[0025] Step 2.1, when the actual packet loss rate P Loss Not greater than the threshold P of the packet loss rate TH , then:

[0026] R(t+Δt)=...

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Abstract

The invention provides an improved AIMD congestion control method which is characterized by comprising the following steps of: (1) judging that honeycomb network congestion is caused by a burst error or bandwidth degradation; if the honeycomb network congestion is caused by the bandwidth degradation, adopting a traditional linearly-increased / manyfold-reduced algorithm to contact with the congestion; and otherwise, entering the next step; (2) constructing a low-pass filter with the time window size of W; when detecting that the congestion occurs, starting a timer w for timing; when the w is not greater than the W, adopting the traditional linearly-increased / manyfold-reduced algorithm to carry out slow start for relieving the congestion; and when the w is greater than the W, starting a quick search algorithm, i.e. increasing the increment of the restoration of the code rate so as to enable the code rate to be quickly restored to available bandwidth; and (3) after the transmission code rate is restored to the proximity of the available bandwidth, starting a congestion avoidance procedure. The invention has the advantage that bandwidth resources can be greatly saved in the field of the monitoring of wireless honeycomb video.

Description

technical field [0001] The invention relates to a method for performing congestion control on network congestion caused by the mismatch between sending code rate and bandwidth in the field of wireless cellular video monitoring. Background technique [0002] In the mobile digital video and audio monitoring system based on CDMA2000 / GPRS (hereinafter referred to as the mobile monitoring system), by using CDMA, GPRS and other data service networks to transmit real-time multimedia data, the video and audio monitoring system is no longer restricted by geographical scope, and can be Set up video and audio monitoring points anywhere in the cellular network coverage area, and watch the video and audio information of the monitoring points in real time in the control center or other places. [0003] In this kind of mobile monitoring system, through a large number of practical experiments and statistical analysis of packet loss characteristics, it is found that the main cause of packet ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W28/02H04W28/04
Inventor 申景双张重阳
Owner 上海海维工业控制有限公司