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Lose-tolerable file transfer control method applicable to space communication system

A file transmission and control method technology, applied in transmission systems, digital transmission systems, electrical components, etc., can solve the problems of link packet loss, large transmission delay, poor reliability, etc., to increase throughput and shorten file transmission. Delay and ensure the effect of transmission reliability

Inactive Publication Date: 2010-06-23
ZHEJIANG UNIV
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Problems solved by technology

[0015] In order to overcome the deficiencies of link packet loss, poor reliability, large transmission delay, and limited throughput in the existing file transfer method of the spatial data transmission system, the present invention provides a method that can effectively avoid link packet loss and ensure reliable transmission. A loss-tolerant file transfer control method suitable for space communication systems with strong performance, shortened file transfer delay, and increased throughput

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  • Lose-tolerable file transfer control method applicable to space communication system
  • Lose-tolerable file transfer control method applicable to space communication system
  • Lose-tolerable file transfer control method applicable to space communication system

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Embodiment Construction

[0040] The present invention will be further described below in conjunction with the accompanying drawings.

[0041] refer to Figure 1 to Figure 5 , a method for controlling loss-tolerant file transmission applicable to space communication systems, the method for controlling transmission of loss-tolerant files comprises the following steps:

[0042] 1) Data weaving process: take the node data at the sending end as the encoding object, and the specific process is:

[0043] (1.1), select a stage d;

[0044] (1.2), randomly select d data blocks from N original data blocks, denoted as S' 1 , S′ 2 ,...,S′ d ;

[0045] (1.3), carry out bit-by-bit XOR operation to the d data blocks, the expression of definition order is:

[0046] p ( d = i ) = ρ ( i ) + μ ( ...

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Abstract

The invention relates to a lose-tolerable file transfer control method applicable to a space communication system, comprising the following steps: 1) data knitting process: (1.1) selecting a step d; (1.2) selecting d data blocks randomly from N original data blocks and recording as S'1, S'2,..., S'd; (1.3) carrying out bitwise XOR operation on the d data blocks; 2) data unknitting process: (2.1) finding a data block with step d=1, receiving more data if the received data blocks have no data block with d=1, till receiving the data block with d=1; (2.2) restoring Sk, and leading to Sk=tn; (2.3) finding other received and Sk-related data blocks ti (i is not equal to n) according to a generated matrix; (2.4) deleting all 'edges' connected with Sk; (2.5) if all Sies are restored, obtaining an original file; and otherwise back to step (2.1). The lose-tolerable file transfer control method can effectively avoid packet loss of link, has strong transmission reliability, shortens the time delay of file transfer, and increases throughput.

Description

technical field [0001] The invention relates to a file transfer protocol technology applicable to a long-distance space communication system, in particular to a loss-tolerant file transfer control method. Background technique [0002] Deep space communication is very different from ground communication. The typical characteristics of deep space communication are: long variable delay, easy link interruption, asymmetric uplink and downlink, and extremely low signal-to-noise ratio. These characteristics are especially evident on the interstellar backbone links in the Interplanetary Internet (IPN: InterPlaNetary Internet) (such as the deep space link from Mars to the Earth). The TCP (Transmission control protocol) protocol is designed with the background of the Internet, and is characterized by negligible delay, symmetrical uplink and downlink bandwidth, continuous effective link and low bit error rate. Medium (such as IPN) has poor performance and does not work properly. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L29/08H04L1/00
Inventor 李晖郁发新罗浩陆哲明
Owner ZHEJIANG UNIV
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