Satellite network dynamic routing method based on inter-satellite link attribute

Abstract

The invention relates to the field of satellite communication, in particular to a satellite network dynamic routing method based on inter-satellite link attributes. The method comprises the following steps: collecting a static snapshot sequence diagram of a satellite network, and constructing a satellite network spatio-temporal evolution diagram; enabling a controller node to collect state information of a satellite node in real time, and respectively calculating a link SNR, link survival time and a dynamic utility value of a satellite cache; giving a weight to the dynamic utility value of each inter-satellite link attribute by adopting a self-adaptive maximum deviation algorithm based on multi-attribute decision making, and constructing a weighted satellite network spatio-temporal evolution diagram; obtaining an end-to-end reachable path of the satellite based on the weighted satellite network spatio-temporal evolution diagram, and establishing an optimization model of link utility; and enabling the controller node to select a transmission path by using the optimization model, and determining a reliable satellite end-to-end transmission path. According to the method, the system routing path can be optimized according to the link state information, so that the network throughput is improved, the packet loss rate is reduced, and the dynamic adaptability is relatively high.

Description

technical field [0001] The invention relates to the field of satellite communication, in particular to a satellite network dynamic routing method based on inter-satellite link attributes. Background technique [0002] With the integration and development of satellite network and mobile communication technology, satellite constellations are gradually developing towards large-scale, high-density and multi-level trends, such as Oneweb, SpaceX and Telesat. The introduction of network innovation technologies such as SDN / NFV provides support for expanding satellite network applications and building a 6G-oriented space-ground integrated network. For Low Earth Orbit (LEO) satellite (Low Earth Orbit, LEO) network, the establishment of Inter-Satellite Link (ISL) can improve the flexibility of satellite network routing and meet the application requirements of high bandwidth and low delay. However, the increase in satellite scale, the enhancement of network heterogeneity, and the high ...

AI Technical Summary

Problems solved by technology

However, in the process of describing the dynamic network topology of the above scheme, the description of the dynamic topology of the satellite network is only the aggregation of static discrete snapshots. Assuming that the link and node attributes do not change within a known period of time, when the network dynamic changes frequently, There is a problem that the topology information is not updated in time, which seriously affects the accuracy of the path selection of the dynamic routing algorithm

At the same time, limited by the computing power of satellites, assuming that the snapshot interval is small enough to ensure that the network topology remains unchanged will bring huge challenges to satellite storage

With the increase of satellite constellation scale, the number of satellite nodes continues to increase, the link state becomes more complex, and the problem of unreliable routing caused by inaccurate topology information becomes more prominent

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