Multi-stage migration method and device for SDN controllers in low-Earth orbit constellation networks

Abstract

This application provides a multi-stage migration method and apparatus for SDN controllers in low-Earth orbit (LEO) constellation networks, relating to the field of LEO satellite network data transmission. The method includes: determining whether to initiate a pre-synchronization process for the original SDN controller deployment node based on real-time acquired data on the intra-domain average transmission delay variation trend and resource utilization variation trend of the original SDN controller deployment node within the target control area of ​​the LEO constellation network; synchronizing static data and original quasi-static data to the pre-synchronization node after initiating the pre-synchronization process; using a dynamic threshold determined based on the average resource utilization of all satellite nodes within the target control area for migration triggering; and achieving dynamic data sharing based on intra-domain satellite nodes after migration triggering. This application effectively prevents resource overload during SDN controller migration and avoids repeated migrations of the SDN controller among a limited number of candidate nodes, thus preventing migration oscillations.

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