Satellite network congestion control method based on bandwidth estimation

Abstract

The invention discloses a satellite network congestion control method based on bandwidth estimation. The method includes the steps of S1, building a network transmission link; S2, using a Hybla-BE congestion control algorithm to perform data communication; S3, by the TCP transmitting terminal of a ground station I, calculating the estimation value of bandwidth according to arrived ACK receiving frequency; S4, calculating expected bandwidth; S5, calculating the residual bandwidth of a communication network, the congestion window increasing factor rho current of an Hybla algorithm and the congestion window increasing factor rho new of the Hybla-BE algorithm; S6, adjusting the congestion window value according to the adjusted window increasing factor rho new; S7, adjusting the congestion window value, to be more specific, by the TCP transmitting terminal of the ground station I, predicting the bandwidth environment of the network by dynamically estimating bandwidth value, and scaling the window increasing factor according to residual bandwidth. By the method, the increasing of the congestion window value can be dynamically adapted to network bandwidth conditions.

Description

technical field [0001] The invention belongs to the technical field of satellite communication, in particular to a satellite network congestion control method based on bandwidth estimation. Background technique [0002] With the continuous development of satellite communication technology, satellite communication network occupies an extremely important position in the field of communication. Studies have shown that there will be many problems when the TCP protocol is directly applied to the satellite network, the most prominent of which is that the long-delay characteristic makes the round-trip delay significantly increased, which further leads to the degradation of network transmission performance. Aiming at the long-delay characteristics of satellite networks, the Hybla algorithm is proposed. By modifying the window change rules in the slow start and congestion avoidance phases, the algorithm uses normalized RTT to reduce the correlation between window changes and RTT, and...

AI Technical Summary

Problems solved by technology

First of all, since the link status cannot be accurately predicted, when the delay increases due to congestion, the aggressive window growth method of the Hybla algorithm will aggravate the congestion instead.

Secondly, although the Hybla algorithm can achieve high network throughput, its excessively large window size will cause serious buffer overflow

In addition, when the delay increases due to a large network load, this aggressive window growth method makes the window growth unable to match the dynamic environment of the satellite network, which will easily lead to congestion.

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