Erasure code based multi-path reliable satellite-ground transmission method for satellite networks
A technology of satellite network and transmission method, applied in transmission system, digital transmission system, sub-channel allocation of transmission path, etc., can solve the problem of high packet loss rate, increase the average end-to-end transmission delay of packets, and increase the average transmission delay of data packets. , low transmission service packet delivery rate, etc., to meet the requirements of reliable transmission packet delivery rate, reduce the average end-to-end delay of packets, and tolerate partial channel failures.
Active Publication Date: 2015-03-04
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology
The high packet loss rate of the satellite-to-ground channel makes the transmission service packet delivery rate low, reducing the reliability of the satellite-to-ground transmission
On the other hand, a high packet loss rate increases the average end-to-end transmission delay of packets
The high packet loss rate of the channel leads to a large increase in retransmission data packets. Due to the large round-trip transmission delay between the satellite and the ground, usually reaching more than 100ms, frequent data retransmissions will greatly increase the average transmission delay of data packets.
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[0031] When ground users access satellites, there are multiple available channels, such as channels allocated by low-orbit (LEO) satellites. LEO satellites usually allocate multiple channels to users to meet user transmission bandwidth requirements. Another example is that ground users can access satellites through some high-altitude relay equipment, such as high-altitude balloons and near-space platforms, so that multi-path transmission can be easily realized between ground users and low-orbit satellites.
[0032] The inter-satellite transmission service usually needs to set the expected reliable transmission packet delivery rate P in order to ensure the transmission quality γ , that is, the ratio of the number of data packets received by the destination node to the number of data packets sent by the source node. The present invention satisfies the desired packet delivery rate P γ , by using RS erasure coding with redundancy η at the source node to improve the success rate o...
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An erasure code based multi-path reliable satellite-ground transmission method for satellite networks is a transmission method for improving the satellite-ground data packet transmission reliability and reducing packet transmission delay. For the high packet loss rate characteristic of satellite-ground transmission channels, an erasure code technology is adopted, data packets are generated into redundant code packets through codes, and destination nodes can perform decoding to obtain original data packets through receiving part of code packets, so that the success rate of satellite-ground data packet transmission is increased. Besides, multiple satellite-ground channels are used for transmitting data, failure of part of the channels can be tolerated, and the transmission robustness can be improved. Characteristics of multi-path parallel transmission are used, a multi-path allocation scheme with the minimum packet transmission delay is formulated, the transmission throughput is increased, and the packet average end-to-end delay is reduced.
Description
technical field [0001] The invention relates to a satellite network-oriented satellite-ground reliable transmission implementation method, which ensures the robustness of the satellite-ground connection and improves the reliability of data transmission through erasure correction coding combined with satellite-ground multiplex transmission technology, and belongs to the technical field of satellite reliable communication . Background technique [0002] The satellite network has good global coverage characteristics and can provide services for various businesses, and has become an important part of the next generation network. Satellite communication links can be divided into inter-satellite links and inter-satellite links, in which ground users access satellites through inter-satellite links. Due to the prolongation of the satellite-to-ground link, and the influence of additional losses such as free space propagation loss, atmospheric absorption, and rain attenuation, the ch...
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CPCH04L1/0057H04L5/0042
Inventor 叶晓国吴昊王明伟朱安顺徐忠国
Owner NANJING UNIV OF POSTS & TELECOMM
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