Sliding mode prediction congestion control system suitable for satellite space information transmission network

Abstract

The invention discloses a sliding mode prediction congestion control system suitable for a satellite space information transmission network, and the system comprises: a sliding mode controller, an SCPS-TP protocol Vegas module, a network router module, a prediction module, and an interference estimation module; the sliding mode controller comprises a reaching law sliding mode surface model and a supplementary item, and is in one-way connection with the SCPS-TP protocol Vegas module; the SCPS-TP protocol Vegas module comprises a nonlinear module and a matching type interference new module, and is in one-way connection with the network router module; the network router module is in one-way connection with the interference estimation module; the prediction model is not arranged in a control loop and is directly connected with the sliding mode controller; and the interference estimation module is bidirectionally connected with the sliding mode controller. The control system has an anti-interference capability, keeps relatively good stability and robustness, can cope with negative effects caused by long time delay, and finally realizes congestion control of the satellite space information transmission network.

Description

technical field [0001] The invention relates to the technical field of satellite communication, in particular to a sliding mode predictive congestion control system suitable for satellite space information transmission network. Background technique [0002] After the completion of the Beidou satellite network in 2020, it has started a large-scale commercialization of industrial integration and has achieved good benefits in aerospace, agriculture, manufacturing, and breeding industries. More and more industries will use Beidou satellites Realize information transmission. However, the communication performance of Beidou satellites has always been the bottleneck problem restricting its own development. Nowadays, when the number of Beidou receiving equipment on the ground continues to expand, because the satellite link bandwidth cannot be easily increased, when the satellite system cannot bear the large amount of data sent from the ground, The communication link of the satellit...

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Problems solved by technology

[0004] Further, in the design process of the satellite space information transmission network controller, there are the following problems: (1) The existing congestion controller design is mostly based on the TCP / IP transmission protocol designed for the ground communication network, but the satellite-ground link The channel propagation delay is large, the channel bandwidth is high, the bit error rate is high, and the asymmetry is strong

The TCP / IP protocol cannot be applied to the satellite information transmission network, and the SCPS-TP protocol takes the communication delay change rate as one of the factors for dynamically updating the congestion window, which strengthens the model's ability to deal with the impact of high satellite-ground delay. Excessive nonlinearity leads to few existing studies and a single model; (2) The existing SCPS-TP communication protocol adopts the Vegas congestion control mechanism, but the high bit error rate phenomenon of the satellite-ground link is not considered in the model. The code rate is mainly affected by the short-term burst flow in the satellite channel, which is an unavoidable matching interference even if the satellite network traffic has a long-term correlation; (3) Although it is possible to choose to introduce interference items, the introduction will inevitably lead to control At the same time, because the communication delay is a problem that cannot be ignored in the satellite-ground link, the high delay will inhibit the transmission rate of the communication source. This conservative mechanism will reduce the bandwidth utilization of the satellite communication. Important issues that are different and need to be reconsidered

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