Sliding Mode Predictive Congestion Control System for Satellite Spatial Information Transmission Network

Abstract

The invention discloses a sliding mode prediction congestion control system suitable for a satellite space information transmission network, comprising the following steps: a sliding mode controller, a SCPS-TP protocol Vegas module, a network router module, a prediction module and an interference estimation module, wherein, The sliding mode controller includes the reaching law sliding mode surface model and supplementary items, and is unidirectionally connected to the SCPS‑TP protocol Vegas module; the SCPS‑TP protocol Vegas module includes a nonlinear module and a new matching interference module, which is unidirectionally connected to the network router module The network router module is unidirectionally connected with the interference estimation module; the prediction model is not placed in the control loop and is directly connected with the sliding mode controller; the interference estimation module is bidirectionally connected with the sliding mode controller. The control system has anti-interference ability and maintains good stability and robustness, and can cope with the negative impact of long delay, and finally realize the congestion control of the satellite space information transmission network.

Description

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

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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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