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A coded message adaptive retransmission method combining compensation and look-ahead

An adaptive, message-based technology, applied in the field of computer networks, to reduce redundancy, improve throughput, and improve decoding speed

Active Publication Date: 2017-05-10
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0012] The technical problem to be solved by the present invention is: aiming at the technical problems existing in the prior art, the present invention provides a simple principle, which can solve the matching problem between retransmission strategy degree and link bit error rate, and can effectively improve data throughput. Combined rate compensation and forward-looking coded message adaptive retransmission mechanism

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  • A coded message adaptive retransmission method combining compensation and look-ahead
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  • A coded message adaptive retransmission method combining compensation and look-ahead

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Embodiment Construction

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0032] A kind of coded message self-adaptive retransmission method combining compensation and look-ahead of the present invention, its steps are:

[0033] (1) The network coding operation is separately placed in an independent network coding layer (NC layer), which is located between the TCP layer and the IP layer.

[0034] The NC layer at the sending end sends a linear combination composed of segments received by the TCP to the IP layer, and the NC layer at the receiving end decodes the received linear combination. The NC layer at the receiving end uses Gaussian decoding for the decoding matrix to update the state of all original messages in the decoding matrix. The state of the original message at the decoding end in the decoding matrix is ​​as follows: figure 2 shown.

[0035] When the message is in the visible state and the mes...

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Abstract

A coding packet adaptive retransmission mechanism combining compensation and foresight comprises the following steps: (1) network coding operation is separately placed in an independent network coding layer, i.e, an NC layer; (2) a sending terminal performs compensation retransmission and foresight retransmission redundancy adjustment by taking the time for receiving ACKs sent by ten receiving terminal NC layers as one adjustment / compensation period, wherein Gap value information is added into the information included in a response packet fed back by receiving terminals, the Gap value is a difference value between First_Byte_Uninvolved and First_Byte_Unseen in the decoding matrix of a decoding terminal NC layer, and the sending terminal performs retransmission of a compensation packet and adjustment of foresight retransmission redundancy R in every compensation / adjustment period according to the Gap value and the change rules of the Gap value. The coding packet adaptive retransmission mechanism combining the compensation and the foresight has the advantages of simple principles, effectively improved data throughput and the like, and can solve problems of coupling of a retransmission sending strategy degree and a link error rate.

Description

technical field [0001] The invention mainly relates to the field of computer networks, in particular to a coded message adaptive retransmission method combined with compensation and look-ahead. Background technique [0002] In the past few decades, the TCP (Transfer Control Protocol) transmission protocol has become the de facto transmission backbone framework of the Internet due to its strong flexibility and reliable transmission capabilities. However, TCP was originally designed based on the characteristics of the terrestrial wired data transmission environment. The wired network is very reliable, and the bit error rate is so low that it can be ignored. The TCP protocol assumes that all packet loss is caused by network congestion. The discovery of any packet loss signal will trigger the TCP congestion control mechanism and blindly reduce the sending rate. When data is transmitted in a network with a high bit error rate, such On the contrary, the behavior will cause the tr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/18H04L1/16H04L1/00
Inventor 吴纯青虞万荣陈一骄赵宝康张鸿云冯振乾毛席龙
Owner NAT UNIV OF DEFENSE TECH
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