This paper discusses issues of feeder link handover and user link handover in Low Earth Orbit (LEO) satellite mobile communication systems without Inter-Satellite Links (ISL). Two feeder link handover schemes are presented. These two schemes are simulated based on two user link handover principles and non-uniform distributed national traffic model of china. Simulation results show that the longest visible duration scheme can greatly reduce the handover frequency of gateway and improve system performance. Consequently this scheme has better value in practice.
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