Data transmission control method for satellite network

Abstract

The invention provides a data transmission control method for a satellite network. The data transmission control method comprises the following steps: S1: at a transmission beginning stage, setting an initial value of a smaller congestion window, quickly adding congestion windows at a speed larger than one time of each round-trip delay RTT time, and quickly detecting the size of congestion windows capable of being supported by a link bandwidth; and S2: in the case of a packet loss event, selecting a value smaller than the size of a current congestion window as a target window; reducing the current congestion window for a certain proportion, then increasing the current congestion window according to a cubic function curve, and when the difference between the congestion window and the target window is smaller, the growth speed is very slow, and the congestion window is maintained for a long time near the target window. The data transmission control method provided by the invention has the advantages of improving the data transmission performance.

Description

technical field [0001] The invention mainly relates to the field of satellite network data transmission, in particular to a satellite network-oriented data transmission control method. Background technique [0002] Satellite network refers to a communication network system composed of artificial earth satellites in various orbits. The core equipment of the satellite network is suspended in space, and its wireless electromagnetic signal covers a wide range. The communication range is less affected by the distance, and the geographical environment of the earth's surface has a weak impact on the communication process. It has an important position in both military and civilian fields. The limitation of the satellite network lies in its indelible link bit error rate (BER) and long round-trip time delay (RTT). Geostationary satellite link bit error rate (BER) of 10 -7 level, the resulting link packet loss rate (PER) is about 0.1-1%, the satellite-to-ground delay is about 260ms,...

AI Technical Summary

Problems solved by technology

A particularly aggressive solution calculates a very large congestion window value after an RTT. This value exceeds other factors that limit the sending rate such as the buffering capacity of the data receiving end, and cannot achieve the effect of controlling the sending rate, but instead aggravates the occurrence of packet loss events.

The improvement scheme of the traditional TCP slow start is used. The slow start process is affected by RTT, which lasts for a long time, has a great impact on throughput, and performance is greatly affected by the timing of packet loss.

[0007] 2. The comprehensiveness of the improvement plan is not strong enough, and the interrelationship of the factors affecting each other is not enough

If the improvement is only aimed at RTT or packet loss, the improved performance is restricted by the unimproved part; the window reduction factor and the window retention time are treated separately, and the improvement mechanism is studied separately, without considering the correlation between them, it is impossible to find the most excellent combination

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