A Congestion Control Method for Satellite Networks Based on Bandwidth Estimation

Abstract

The invention discloses a satellite network congestion control method based on bandwidth estimation, comprising the following steps: S1: establishing a network transmission link; S2: using the Hybla-BE congestion control algorithm for data communication; S3: the TCP sending end of the ground station 1 Calculate the estimated bandwidth according to the receiving frequency of the received ACK; S4: Calculate the expected bandwidth; S5: Calculate the remaining bandwidth of the communication network, the congestion window growth factor ρcurrent of the Hybla algorithm, and the congestion window growth factor ρnew of the Hybla-BE algorithm; S6: According to The adjusted window growth factor ρnew adjusts the congestion window value; S7: Adjusts the congestion window value: the TCP sending end of ground station I predicts the bandwidth environment of the network by dynamically estimating the bandwidth value, and scales and adjusts the window growth factor according to the remaining bandwidth to achieve congestion The growth of the window value can dynamically adapt to the network bandwidth condition.

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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