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TCP (transmission control protocol) congestion control method based on network effective bandwidth and ECN (Explicit Congestion Notification) mechanism

An effective bandwidth and congestion control technology, applied in the direction of data exchange network, digital transmission system, electrical components, etc., can solve the problems of inability to apply data center network and congestion control, and achieve the effect of avoiding the halving of the sending window

Inactive Publication Date: 2013-04-17
BEIHANG UNIV
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Problems solved by technology

However, wireless TCP congestion control methods cannot control congestion in advance, and cannot be applied to data center networks.

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  • TCP (transmission control protocol) congestion control method based on network effective bandwidth and ECN (Explicit Congestion Notification) mechanism
  • TCP (transmission control protocol) congestion control method based on network effective bandwidth and ECN (Explicit Congestion Notification) mechanism

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0019] The purpose of the present invention is to propose a TCP congestion control method based on network effective bandwidth and ECN mechanism, which can be used in wired data center network and wireless network at the same time. This method performs ECN marking on the switch, and the receiver determines whether the ACK it sends should set the ECN-echo bit according to the state of the ECN marking bit in the received data packet. The sender calculates the effective bandwidth of the network and dynamically adjusts the sending window according to the state of the ECN-echo bit in the received ACK. The present invention comprehensively considers the characteristics of the data center network and the wireless network, can alleviate the TCP Incast phenomenon of the wired data center network, and avoid network performance degradation caused by wirel...

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Abstract

The invention provides a TCP (transmission control protocol) congestion control method based on network effective bandwidth and an ECN (Explicit Congestion Notification) mechanism. The method comprises the following steps of step 1, performing ECN marking on a switch; step 2, setting ECN-echo by a receiver; step 3, dynamically adjusting a sending window by a transmitter, when a transmitting end receives an ACK (acknowledgement character), firstly calculating effective bandwidth BWE and minimum round-trip time delay RTTmin of a current network by a BWE calculation module; and then looking over whether the ACK sets an ECN-echo bit by an ECN control module, if so, setting ecn_flag showing that the sending velocity is needed to be adjusted according to the ECN, and calculating the ratio alpha of the received ACK with the ECN-echo marks to the total number of data packets sent by the previous sending window. By adopting the ECN technology and the control method based on the network effective bandwidth, the ECN can perform controlling in mild congestion of the network, thereby avoiding TCP Incast phenomenon in a wired data center; the control method based on BWE can be used for adjusting the sending window according to the effective bandwidth of the current network when the packet is lost, so that the halving of the sending windows caused by wireless random packet loss can be avoided.

Description

technical field [0001] The invention relates to the technical field of computer network and communication, in particular to a TCP congestion control method based on network effective bandwidth and ECN mechanism. Background technique [0002] Traditional wired data center network TCP congestion control algorithms use packet loss in the network as a congestion signal. When packet loss occurs, the algorithm will reduce the speed at which data packets are sent on the connection, thereby avoiding network congestion. [0003] As the scale of the data center expands, the phenomenon of uneven network load distribution becomes more and more serious, and the wiring problem of the wired data center becomes more and more complicated. To solve these problems, wireless technology was introduced into the existing wired data center network. However, due to the unreliability of the wireless network medium, there are a large number of random packet loss unrelated to congestion in the network...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/807H04L12/801H04L47/27
Inventor 王静远蒋云晶李超熊璋
Owner BEIHANG UNIV
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