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Method for confronting link circuit out of order

A link and algorithm technology, applied in the field of data communication, can solve the problems of affecting the transmission rate and increasing the network load, so as to improve the transmission rate and solve the effect of network retransmission

Inactive Publication Date: 2008-07-23
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Starting fast retransmission in this case not only increases unnecessary network load, but also affects the sending rate due to the narrowing of the congestion window caused by misjudgment

Method used

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  • Method for confronting link circuit out of order
  • Method for confronting link circuit out of order
  • Method for confronting link circuit out of order

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Embodiment Construction

[0022] The Fast Retransmit (Fast Retransmit) algorithm stipulates that if a message is missing by 4 notifications, then start fast retransmission to retransmit the message. The present invention refers to this number of times as "fast retransmit start threshold", and simultaneously As a variable parameter, it can be adjusted dynamically.

[0023] 1. After establishing a link based on a reliable transport protocol (TCP or SCTP), set the default value of "Fast Retransmission Start Threshold" to 4.

[0024] 2. After fast retransmission occurs, record the transmission sequence number (TSN, Transmission Sequence Number) of the retransmitted message. If there is a duplicate field in the received SACK, compare the TSN of the duplicate field with the TSN of the local record. If all the TSNs in the duplicate field of the SACK are caused by fast retransmission, add 1 to the "fast retransmission start threshold".

[0025] 3. When timeout retransmission occurs, reduce the value of "fast...

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Abstract

The invention discloses a process for opposing chain out-of-order, which is applied in the data communication field, and comprises the following steps that setting fast retransmission starting threshold in a fast retransmit algorism, modifying the valve of the fast retransmission starting threshold by a sending terminal when the fast retransmission or overtime retransmission is produced, and conducting the fast retransmission for message when the loss indication accumulation value of some message is surpassed the value of the fast retransmission starting threshold. The technical scheme of the invention solves the problem of the message retransmission under the condition that the message is out of order, and simultaneously increases the transmission speed.

Description

technical field [0001] The invention relates to the field of data communication, in particular to a method for combating link disorder. Background technique [0002] Transmission Control Protocol (Transmission Control Protocol, TCP) and Stream Control Transmission Protocol (Stream Control Transmission Protocol, SCTP) are currently the most widely used reliable transmission protocols, which not only ensure the reliable and orderly transmission of messages, but also have good Network congestion control and congestion recovery mechanisms. However, if packets are out of order in the network (for example, there are multipaths in the network), it may cause TCP and SCTP to start fast retransmission (Fast Retransmit). The Selective Acknowledgment (SACK, Selective Acknowledgment) algorithm is widely used in reliable transmission protocols. The SCTP protocol specifies it as an SCTP acknowledgment method (rfc2960), and the TCP protocol specifies it as an TCP optional acknowledgment me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L29/06H04L1/18H04L12/56H04L45/02
Inventor 闫新成
Owner ZTE CORP