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Adaptive error control method combining random network coding and automatic repeat request

A random network coding and automatic retransmission request technology, applied in the direction of error prevention, transmission system, digital transmission system, etc., to avoid redundancy, improve transmission reliability, and reduce waste

Active Publication Date: 2012-11-07
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an adaptive error control method combining random network coding and automatic repeat request for how to improve the reliability of the current multimedia video network transmission, which can improve the reliability of the entire multimedia video network transmission

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  • Adaptive error control method combining random network coding and automatic repeat request
  • Adaptive error control method combining random network coding and automatic repeat request
  • Adaptive error control method combining random network coding and automatic repeat request

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Embodiment Construction

[0029] Embodiments of the present invention will be further described in detail below in conjunction with the drawings and specific implementation methods.

[0030] In this embodiment, the standard test video sequence "Coastguard" with a video resolution of CIF352×288 is taken as an example. The video source node divides the collected video data into i data blocks (i=1, 2, 3, . . . ), Each data block consists of h data packets M 1 ,...M h composition.

[0031] The source node performs random network encoding on the h data packets in each data block to generate n encoded data packets where k=1,2,...,n, is an encoded vector. In general, n is greater than h, and there are n-h redundant data packets to deal with packet loss caused by unreliable transmission of links. After encoding, the source node will encode vectors and encoded packets (X k , g k ) are forwarded simultaneously through the transmission path, and are used for decoding by the destination receiving node to ...

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Abstract

The invention discloses an adaptive error control method combining random network coding and automatic repeat requests (ARQ). In the method, a data transmission link is established between a source transmitting end and a target receiving end, a video transmission source node divides acquired video data into a plurality of blocks each of which comprises h data packets, random network coding is carried out on the data packets in each data block to generate coded data packets, and then the coded data packets are transmitted. A target receiving node performs network coding and decoding on the received coded data packets, then judges whether the received coded data packets are restored to original data blocks, and transmits feedback packets to the video source node to request the source node to regulate the number of the coded data packets to be transmitted according to the feedback information, thus realizing the adaptive error control of the transmission link. In the method, the transmission node regulates the number of the coded data packets to be transmitted according to current network link conditions to realize error-free transmission of a network, thus reducing the redundancy ofdata transmission, saving network sources and improving the transmission reliability of the whole network.

Description

technical field [0001] The present invention relates to an adaptive error control method combining random network coding and automatic repeat request (ARQ). To achieve reliable transmission of the transmission link. technical background [0002] Compared with the traditional data network, a large amount of video data can be collected and processed in the multimedia video network, and multimedia information such as video and images with rich information can be obtained, so that the entire network system can provide more abundant service types. These applications challenge the carrying capacity of existing broadband multimedia networks. How to ensure the quality of video transmission and improve the reliability of network transmission is an important research hotspot of video transmission network. [0003] Affected by time-varying channels and burst errors, the reliability of network transmission has been restricting the development of multimedia video networks. The main co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00H04L1/16H04L1/18
Inventor 邹君妮谭冲汪敏
Owner SHANGHAI UNIV