Congestion control mechanism based on advertisement window adjusting method under SDN environment

A technology for notification window and congestion control, applied in digital transmission systems, data exchange networks, electrical components, etc., to solve problems such as insufficient research

Active Publication Date: 2018-11-06
EAST CHINA NORMAL UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, when the load of the entire network is relatively high, the mechanism o...

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  • Congestion control mechanism based on advertisement window adjusting method under SDN environment
  • Congestion control mechanism based on advertisement window adjusting method under SDN environment
  • Congestion control mechanism based on advertisement window adjusting method under SDN environment

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Embodiment Construction

[0019] The present invention will be further described in detail in conjunction with the following specific implementation examples and accompanying drawings. The process, conditions, experimental methods, etc. for implementing the present invention, except for the content specifically mentioned below, are common knowledge and common knowledge in this field, and the present invention has no special limitation content.

[0020] Such as figure 1 The present invention shown can be divided into four main steps: ① the administrator sets operating parameters; ② the controller calculates the expected bandwidth; ③ the controller calculates and issues the expected notification window; ④ the switch modifies the packet notification window. The entire invention works on figure 2 in the working environment shown. From figure 2 You can see that the source nodes (hosts) are connected together through intermediate nodes to form a network. The operation of the entire network is under the...

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Abstract

The invention relates to the field of the SDN and the computer network, and realizes a congestion control mechanism based on an advertisement window adjusting method under SDN environment. The methodcomprises the following steps: a manager sets a parameter related to the system operation, and assigns a corresponding bandwidth distribution algorithm for a service stream in controller management range; the controller dynamically collects related information of various nodes in a network, computes the corresponding expected bandwidth for the service stream according to the bandwidth distributionalgorithm; the controller computes and issues an expected advertisement window value to a switch according to the computed expected bandwidth value; the switch transmits the actual bearing capacity of the network to a source-end node by using the advertisement window adjusting method; and the source-end node precisely adjusts a data packet sending rate according to a network status, thereby better adapting the network change and improving the network resource utilization rate. Through the method disclosed by the invention, the existing congestion control mechanism of the source-end node is unnecessary to modify, the method can be compatible with the existing network congestion control method, and can well solve the unfairness problem when the ECN and the non-ECN are coexistent.

Description

technical field [0001] The invention relates to the technical field of SDN (Software-Defined Networking) and computer network, and realizes a congestion control mechanism based on the method of adjusting the notification window under the SDN environment. Background technique [0002] The throughput of the network is closely related to the load of the communication subnet (that is, the number of packets being transmitted in the communication subnet). When the load of the communication subnet is relatively small, the throughput of the network (the number of packets / second) increases linearly with the increase of the network load (the average number of packets in each node). When the network load increases to a certain value, if the network throughput decreases instead, it indicates that there is congestion in the network. In a congested network, packets arriving at a certain node will encounter no buffer available, so that these packets have to be retransmitted by the previou...

Claims

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Application Information

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IPC IPC(8): H04L12/825H04L12/927H04L12/24H04L47/80
CPCH04L41/0896H04L47/263H04L47/80
Inventor 姜金浩章玥
Owner EAST CHINA NORMAL UNIV
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