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Multicast method for distributing mass file applied to satellite data broadcasting system

A technology for large-scale file and multicast distribution, applied in transmission systems, electrical components, etc., can solve problems such as inability to receive, burst bit errors, and large bandwidth, and achieve complete accuracy, ensure correct reception, and reduce the reception rate. Effect

Inactive Publication Date: 2004-03-10
TSINGHUA TONGFANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, how to achieve reliable data transmission in a one-way environment, especially the reliable transmission of GB-level large files, is currently a major problem
In the current existing technology, some people directly move the file sending method of LAN to the satellite system, which takes up a lot of bandwidth when sending, and other services cannot be carried out normally due to the influence of this abnormal flow; and the bandwidth is uncontrollable, so it has to Rent a lot of satellite bandwidth
The existing multicast distribution method for large files in the satellite broadcasting system mostly adopts empty packet filling technology combined with forward error correction (FEC) technology, but in this way, data needs to be transmitted multiple times, and the probability of data error always exists
Moreover, during the long-term communication process of the satellite system, due to the interference of the natural environment, burst errors may occur, and this burst error may also lead to the inability to receive files correctly
In addition, as the file increases, the probability of receiving it is smaller; if the file is too large, it may cause the user's buffer to overflow and fail to receive, affecting the stability of the satellite transmission system

Method used

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  • Multicast method for distributing mass file applied to satellite data broadcasting system
  • Multicast method for distributing mass file applied to satellite data broadcasting system
  • Multicast method for distributing mass file applied to satellite data broadcasting system

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Embodiment Construction

[0016] see figure 1 , the present invention is composed of a satellite master station for distributing files and streams and a small station for receiving files and streams in terms of hardware. The hardware system of the present invention includes two parts, a sending end and a receiving end, wherein the sending end transmits the multicast data to the satellite IPE packer through the local area network, goes to the satellite through a modem, and broadcasts downwards with satellite signals. There are two ways for the receiving end. One is to install a satellite receiving card on the receiving computer to directly receive satellite signals, receive files and forward video streams on the receiving computer. The other one uses a satellite receiver to receive the signal, and the machine rebroadcasts the received signal to the local area network, and the computer on the local area network can directly receive the data through the network card. On the transmission layer of the pres...

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Abstract

The invention guarantees that in transferring large type of file, data transmission is correct and reliable as well as transmitting speed and redundancy are adjustable so as to raise stability and quality of satellite system of operation. UDP / IP protocol is adopted in the invention, and forward error correction (FEC), asynchronous layered code (ALC) and receive layered control (RLC) is utilized in code transmission layer. Recovery volumes are adopted in file process layer of application layer. Thus, large file is divided into hundreds or thousands of small files. Recovery volume is generated for each small file. When error occurs, receiver through redundant volume recovers and corrects errors. The invention is mainly applied to transmission of large file on monodirectional unreliable link of satellite.

Description

[0001] Field [0002] The invention relates to a method for delivering file data on a one-way unreliable satellite link, in particular to a large-scale file multicast distribution method for a satellite data broadcasting system. Background technique [0003] Satellite transmission is an ideal way of information transmission. It is not restricted by region, flexible, convenient, high-speed and stable. Users around the world only need to install satellite receiving antennas and satellite receiving cards to receive various data information through computers. However, the correct transmission of data in the satellite transmission system will be affected by many aspects such as network conditions and server processing capabilities. Especially when it comes to reliable transmission of a single huge file, the requirements for all aspects are higher. Considering my country's national conditions and economic factors, satellites cannot provide two-way connections, so the UDP / IP protoc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L29/06
Inventor 李军
Owner TSINGHUA TONGFANG CO LTD
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