Method for enhancing transmission protocols in satellite communication system

Abstract

A satellite network transmission control protocol is a method for controlling data transmission in a satellite network transmission layer, used for carrying out flow control and error control for the transmission in a network, realizing high-efficiency data transmission and belonging to the technical field of computer network and satellite channel transmission. The method of the invention is characterized by the improvement made on the basis of the existing TCPW algorithm and realization of a TCPW-BC algorithm applicable to a satellite network having large time delay and high bit error rate. The algorithm mainly aims at improving the congestion avoidance in congestion control. On the basis of TCPW bandwidth estimation algorithm, the algorithm adopts a window control algorithm based on binary growth, approaches the optimum sending window through binary comparing growth, and carries out window adaptability adjustment at every RTT instead of after packet loss, raising network utilization rate. The invention is applicable to satellite networks having large time delay and high bit error rate and is capable of realizing high-efficiency data transmission.

Description

technical field [0001] The invention belongs to the technical field of computer network and satellite channel transmission, and relates to an enhancement method applied to the TCPWESTWOOD protocol in a satellite communication system. It is mainly used to solve the problem of low transmission efficiency of TCPWESTWOOD congestion control mechanism in satellite communication. Background technique [0002] Satellite network is an important part of the Internet in the future. With the development of satellite networking technology, satellite network has gradually become the bearer network of Internet. The cost has nothing to do with the distance, and it is not affected by natural disasters on the ground. Therefore, satellite communication is well adapted to the needs of the current rapid development of Internet services. In the emergency disaster relief communication support, the satellite network plays an irreplaceable role, and it is of great significance to study the transmis...

AI Technical Summary

Problems solved by technology

[0006] Technical problem: according to the above-mentioned because the congestion avoidance mechanism in TCPW adopts the window increase mechanism of additive increase multiplicative decrease (AIMD) and the transmission performance on the satellite link caused by the long delay of the satellite link, the present invention provides a The modification method of the TCPW protocol congestion control mechanism in the satellite communication system, on the basis of the TCPW bandwidth estimation algorithm, it adopts the window control algorithm based on the bisection growth, and changes the adaptive adjustment of the window from after packet loss to once every RTT to solve the problem. The impact on the performance of the satellite signal link due to long delay and other factors can be eliminated, and the best performance of the satellite signal link can be achieved by controlling the growth factor

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