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LT code based spatial delay/disruption tolerant network (DTN) transmission method

A transmission method and space technology, applied in the field of space DTN transmission based on LT code, can solve the problems of inability to meet the data transmission requirements of long-distance space communication, frequent feedback, and reducing link transmission efficiency.

Active Publication Date: 2013-10-16
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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Problems solved by technology

[0008] Most of the above-mentioned transmission protocols adopt the ARQ mechanism, which will cause frequent feedback on the link with a high packet loss rate, seriously increase the data transmission delay, reduce the transmission efficiency of the link, and cannot meet the data transmission requirements of long-distance space communication.

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  • LT code based spatial delay/disruption tolerant network (DTN) transmission method
  • LT code based spatial delay/disruption tolerant network (DTN) transmission method
  • LT code based spatial delay/disruption tolerant network (DTN) transmission method

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Embodiment Construction

[0045] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0046] see figure 1 and figure 2 , the present invention provides a spatial DTN transmission method based on LT codes. The space DTN transmission method based on LT codes of the present invention is based on a new transmission protocol based on rateless coding (Rateless Coding based LTP, RCLTP, hereinafter referred to as RCLTP protocol).

[0047] The RCLTP protocol is located between the package layer and the network layer, and belongs to the transport layer protocol. Its position in the DTN protocol stack architecture is as follows: figure 1 shown. The space DTN transmission method based on LT code of the present invention comprises the following steps:

[0048] Step A, such as figure 1 As shown, the source file is split into multiple Bundles (data bundles), and the data bundles are split to generate ES (encoded segment, Encoded Segment,...

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Abstract

The invention provides an LT code based spatial delay / disruption tolerant network (DTN) transmission method, which is characterized by comprising the steps that: A, a source file is divided into a plurality of data bundles, and the data bundle is divided so as to generate code segments; B, the data bundles carry out session transmission by taking a block as a session unit, a transmitting end transmits a code segment, a receiving end receives the code segment and carries out decoding relay on the code segment so as to generate a data segment, and the unsuccessfully recovered data segment is retransmitted; C, the above steps are repeated until the transmitting end confirms that the receiving end has recovered the data bundles successfully; and D, the next session transmission is carried out. The transmission method provided by the invention has small transmission delay and high handling capacity in a ground-fire communication scene set by the invention, and occupation of the node storage space is obviously reduced in the file transmission process.

Description

technical field [0001] The invention relates to a space DTN transmission method based on LT codes. Background technique [0002] With the continuous deepening of human exploration of space, the space communication network presents completely different characteristics from the ground communication network. It has the characteristics of long delay, high bit error, asymmetric link uplink and downlink, and intermittent, which belongs to the typical " Restricted Network" environment. In recent years, Delay / Disruption Tolerant Network (DTN) has provided a good opportunity to solve the problem of data transmission in space networks by virtue of mechanisms such as store-and-forward and custody transmission, and has therefore become the main solution for the future interstellar Internet. One of the options. [0003] Space DTN is built on the network layer of the traditional space communication protocol stack. By adding an overlay layer (Bundle Protocol Layer) between the applicatio...

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Application Information

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IPC IPC(8): H04L1/00H04L1/16
Inventor 张钦宇顾术实焦健杨志华
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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