Low Earth Orbit (LEO) satellites have become great extensions of terrestrial networks to enable the global coverage and ubiquitous communications. However, the LEO system needs to handle the problem of frequently inter-satellite handover where the conventional single-user based handover will incur significant signaling overhead and increase the probability of handover failure, especially in massive user terminals (UTs) scenarios. Thus, we propose a novel group handover strategy for LEO satellite networks which mainly includes a user grouping algorithm and a handover scheduling method. Specifically, we first use the hierarchical clustering to group the UTs according to the network load and the properties of UTs. We next design a division restricted satellite selection algorithm based on a network-flows model, where the user group is scheduled as a whole in the first priority. Simulation results validate the great advantages of the proposed strategy in the signaling overhead reduction and the improvement in terms of the successful handover possibility, the quality of experience (QoE) of UTs and the load balance during the inter-satellite handover.
A Group Handover Strategy for Massive User Terminals in LEO Satellite Networks
2022-09-01
653781 byte
Conference paper
Electronic Resource
English
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