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Method for managing active queue of route based on control of slipform variation structure

A technology of active queue management and sliding mode variable structure, applied in digital transmission systems, electrical components, transmission systems, etc., can solve problems such as inability to adapt to complex and changeable network environments, poor robustness of algorithms, and impracticality

Inactive Publication Date: 2006-12-06
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, the actual network state is constantly changing, and it is unrealistic to regard the network as a linear steady system in the design process of the PI controller. Therefore, the algorithm based on the above assumptions has poor robustness and cannot adapt to complex and changeable conditions. network environment

Method used

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  • Method for managing active queue of route based on control of slipform variation structure
  • Method for managing active queue of route based on control of slipform variation structure
  • Method for managing active queue of route based on control of slipform variation structure

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Embodiment Construction

[0050] The present invention uses the sliding mode variable structure control (SMVS, Sliding Mode Variable Structure) theory in the robust control theory to design a kind of robust control method called SMVS for Active Queue Management (AQM, Active Queue Management), and the purpose is to obtain performance New controller superior to PI. The simulation test results show that this controller is insensitive to noise and parameter changes, and is very suitable for the time-varying characteristics of the network; it has good comprehensive performance, good responsiveness, and is particularly robust in controlling the team leader.

[0051] The existing literature gives a nonlinear model of TCP flow control based on fluid flow theory. The simplified form of the model is as follows:

[0052] dW ( t ) ...

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Abstract

The method features: in term of the predetermined amount of active sessions, target value of queue length, link capacity and length of small queue within the range of round-trip delay, a sliding mode variable structure control system having a sliding mode parameter Omega=2, which adopts a combination of ratio control and constant-value control, are used to control the discarding probability of packet.

Description

technical field [0001] The invention belongs to the field of router queue management and congestion control. Background technique [0002] Congestion control plays a very important role in Internet traffic management. Traditional congestion control mainly relies on TCP flow control on the end system, but recent studies have shown that no matter how sophisticated the mechanism is, the role that the end system can play in flow management is limited after all, and the function of extending intermediate nodes should be An effective means to enhance end-to-end congestion control. As a mechanism for discarding or marking packets in router queues, Active Queue Management (AQM, Active Queue Management) is proposed to support end-to-end congestion control on the Internet, and has become a research hotspot recently. [0003] The technical goals of AQM are: (1) reduce the average queue length of routers and thereby reduce the end-to-end delay experienced by packets; (2) reduce excess...

Claims

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Application Information

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IPC IPC(8): H04L12/56H04Q3/00H04L12/861
Inventor 任丰原庄锦军林闯
Owner TSINGHUA UNIV
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