Transactions of Nanjing University of Aeronautics & Astronautics
Multi-objective Handover Strategy for Space Earth Integrated Network
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Abstract:
Efficient information transmission is crucial for the development of space-ground integrated network（SGIN）， especially with the growing complexity of low Earth orbit （LEO） satellite architectures. This study aims to optimize the handover process between terrestrial users and satellites by considering metrics such as handover times， elevation angle， and available channels. The proposed mathematical model divides the Earth into multiple regions， and the optimization objective is a weighted sum of the number of handovers and load balance， which determines the weighted coefficients based on different scenarios. The elevation angle can be optimized by setting a threshold that indicates the quality of information transmission. The study transforms the SGIN handover problem into an integer linear programming （ILP） problem and solves it by using mathematical tools to provide an optimal solution. However， due to the high algorithmic complexity of the ILP-based strategy in practical engineering applications， a heuristic handover strategy based on bipartite graphs is also proposed. Simulations on a typical LEO satellite constellation （Globalstar） validate the effectiveness of the proposed handover strategies.
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Project Supported:
This work was supported by the National Natural Science Foundations of China （Nos. 61961040， 61771089）， and the Sichuan Provincial Key Research and Development Program （No.2021YFQ0011）.
Clc Number:
TN927.2
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