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TCP friendly rate control method based on change rate of handling capacity and ECN mechanism

A rate control and throughput technology, applied in the field of TCP-friendly rate control, can solve problems such as network congestion, inapplicability to data center networks, and inability to control early, to achieve the effect of preventing network congestion

Active Publication Date: 2013-09-04
BEIHANG UNIV
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Problems solved by technology

But they are all based on packet loss, and if the packet loss is really caused by congestion, it means that the network congestion at this time is already very serious
None of these methods can control early to prevent congestion
So it is not suitable for data center network

Method used

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  • TCP friendly rate control method based on change rate of handling capacity and ECN mechanism
  • TCP friendly rate control method based on change rate of handling capacity and ECN mechanism
  • TCP friendly rate control method based on change rate of handling capacity and ECN mechanism

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Embodiment Construction

[0034] like figure 1 As shown, the implementation steps of the present invention are as follows:

[0035] Step 1: ECN marking on the switch

[0036]When the switch receives a data packet, it first judges the queue length of the current buffer, and if it exceeds a certain threshold, it sets the ECN flag bit for the data packet. Otherwise, not set.

[0037] Step 2: The receiver sets ECN-echo

[0038] The receiver checks whether the received packet has the ECN flag set, and if so, sets the ECN-echo bit in the ACK it sends, otherwise, returns an ACK with no ECN-echo bit set.

[0039] Step 3: The sender dynamically adjusts the sending rate

[0040] like figure 2 As shown, the sender mainly includes a throughput change rate calculation module, an ECN control module, a packet loss determination module and a transmission rate control module. The specific control process is as image 3 shown. The sender maintains a virtual send window win. When the sender receives the ACK, th...

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Abstract

The invention discloses a TCP friendly rate control method based on the change rate of handling capacity and an ECN mechanism. ECN marking is conducted on an interchanger first. A receiving party decides whether an ECN-echo position should be arranged for ACK sent by the receiving party according to the state of an ECN marking position in received data package. A sending part maintains a virtual sending window win, calculates the change rate of the handling capacity, adjusts the virtual sending window win according to the state of the ECN-echo position in received ACK and the dynamic conditions of the change rate of the handling capacity, and finally calculates a new sending rate according to win. The method comprehensively considers the characteristics of a data central network and the characteristics of a wireless network, can relieve the TCP Incast phenomenon of the wired data central network, and prevents network performance from descending due to wireless packet loss. Consequently, the method can be used in the wired data central network and the wireless network.

Description

technical field [0001] The invention relates to a TCP friendly rate control method based on a throughput rate of change and an ECN (Explicit Congestion Notification, explicit congestion notification) mechanism, and belongs to the technical field of computer networks and communications. Background technique [0002] The traditional wired data center network TCP congestion control algorithm uses the packet loss in the network as a congestion signal. When the packet loss occurs, the algorithm will reduce the sending window, thereby reducing the transmission speed of the connected data packets, thereby avoiding network congestion. [0003] With the expansion of data center scale, the phenomenon of uneven network load distribution becomes more and more serious, and the wiring problem of wired data center becomes more and more complicated. To address these issues, wireless technology was introduced into existing wired data center networks. However, due to the unreliability of the...

Claims

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Application Information

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IPC IPC(8): H04L12/811H04W28/22
Inventor 王静远蒋云晶李超欧阳元新熊璋
Owner BEIHANG UNIV
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