Study Of Asymmetric Routing Algorithm For LEO Layer Network Of Space-based Information System

Space-based Information Network (SIN) is divided into three layers, including GEO(Geostationary Earth Orbit) layer, MEO (Medium Earth Orbit) layer and LEO (LowEarth Orbit) layer. In comparison with other layers of satellite network, LEO satellitenetworks routing algorithm is representative, and can be used as the basis of studyingother types of satellite network routing algorithm. So LEO satellite networks are used asthe research object in this thesis. With the expansion of SIN application andrequirements of further strengthened in military and civilian, asymmetric link charactersbecome extrusive. As a result, exiting symmetric routing algorithm could not apply toasymmetric link. Asymmetric routing algorithm for SIN is necessary to be researched.First of all, some conceptions are introduced in this thesis, including the generalsituation of SIN and its constellation model, LEO satellite networks routing algorithmsand related conceptions. Secondly, an asymmetric discrete time based routing algorithm(A-DTRA) is proposed for LEO satellite networks. This algorithm has the certaininnovation in the research of asymmetric routing. Simulation results show that A-DTRAhas better end-to-end delay performance, and can ensure the correct packet forwarding.In addition, it is well suitable for LEO satellite networks with asymmetric links. Finally,summary of the whole dissertation is given and the issues of A-DTRA that need to bestudied further are also presented.