In recent years, low earth orbit (LEO) satellite networks (LSNs) have attracted increasing attention due to economic prospect and advantages in high bandwidth and low latency. In order to provide higher quality of service (QoS) and address the frequent handover problem among LEO satellites, we propose a user-centric handover scheme for ultra-dense LSNs in this letter. Our basic idea is to exploit satellite’s storage capability to improve user’s communication quality. By buffering user’s downlink data in multiple satellites simultaneously, the terrestrial user can realize seamless handover and always access the satellite with the best link quality. Simulation results show that our user-centric handover scheme outperforms the traditional handover scheme in terms of throughput, handover delay and end-to-end latency.

中文翻译：

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一种以用户为中心的超密集低轨卫星网络切换方案

近年来，低地球轨道（LEO）卫星网络（LSN）因其经济前景和高带宽、低延迟的优势而受到越来越多的关注。为了提供更高的服务质量 (QoS) 并解决 LEO 卫星之间的频繁切换问题，我们在这封信中提出了一种以用户为中心的超密集 LSN 切换方案。我们的基本思想是利用卫星的存储能力来提高用户的通信质量。通过同时在多颗卫星上缓存用户的下行数据，地面用户可以实现无缝切换，始终接入链路质量最好的卫星。仿真结果表明，我们以用户为中心的切换方案在吞吐量、切换延迟和端到端延迟方面优于传统切换方案。