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Window increasing method based on deferred constraint at congestion avoidance stage in data communication network (DCN)

A congestion avoidance and delay-constrained technology, applied in advanced technology, digital transmission systems, climate sustainability, etc., can solve problems such as inability to fully utilize data center network communication capabilities, and inability to perceive data flow delay constraints in a timely and effective manner. Achieve the effect of realizing TCP friendliness

Active Publication Date: 2013-12-18
HUNAN NEW CLOUDNET TECH CO LTD
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Problems solved by technology

[0009] In order to solve the problems that the above-mentioned data center network congestion control process cannot timely and effectively perceive the delay constraint requirements of the data flow, and cannot make full use of the communication capability of the data center network, the present invention provides a delay constraint-based congestion avoidance phase augmentation in DCN. window method

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  • Window increasing method based on deferred constraint at congestion avoidance stage in data communication network (DCN)
  • Window increasing method based on deferred constraint at congestion avoidance stage in data communication network (DCN)
  • Window increasing method based on deferred constraint at congestion avoidance stage in data communication network (DCN)

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Embodiment Construction

[0044] see figure 1 , figure 1 It is a flowchart of the present invention. The process is as follows:

[0045] Set the initial size of the sending window cwnd according to the TCP default method 0 =1, initialize the network congestion degree α 0 =0; set the switch egress cache queue length threshold K=65.

[0046] After initializing various parameters, the sender judges whether all ACKs of the current window have been received, and if not, continues to wait; otherwise, the sender calculates the proportion of the marked ACKs in the current window to all ACKs, and then the sender calculates The resulting network congestion degree α i-1 and f i Perform weighted average operation to update the network congestion degree α i ;

[0047] alpha i =(1-g) * alpha i-1 +g * f i

[0048] In the above formula, f ｉ Indicates the ratio of marked ACKs to all ACKs in the current window, g is the weighted average coefficient, and the value is 1 / 16.

[0049] Then the sender uses th...

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Abstract

The invention discloses a window increasing method based on deferred constraint at a congestion avoidance stage in a data communication network (DCN). At the congestion avoidance window increasing stage, the window incremental quantity is set according to a network congestion state and data flow urgency degree to enable the window increase rate to adapt to the change between linear increase and index increase. The window increasing method can enable data flows to reasonably use network available bandwidth according to deferred constraints, accordingly the communication time of the data flows is shortened, the quantity of the data flows transmitted under the deferred constraints is increased, and meanwhile the friendliness of a transmission control protocol (TCP) is achieved.

Description

technical field [0001] The invention relates to a window increasing method in the congestion avoidance stage in the congestion control process of a data center network (DCN, Data Center Network). Background technique [0002] When the data center network provides application services for network users, hundreds of data flows are often generated inside the data center. The machine summarizes and organizes the calculation results of all the working machines, and then submits them to the user. [0003] Such services provided by data center operators generally have a standard to measure the quality of service, and this standard is mainly the response delay of the service in the eyes of users, that is, from the time when the user sends a service request to the data center to the time when the data center The time elapsed for the operation to complete and deliver the result to the user. Generally speaking, the response delay of the service should be guaranteed between 200ms-300m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/807H04L47/27
CPCY02D30/50
Inventor 王建新张韬黄家玮
Owner HUNAN NEW CLOUDNET TECH CO LTD
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