低地球轨道卫星互联网接入网络的 5G 综合用户下行链路自适应传输方案

Dongdong Wang, Chenhua Sun, Xiujie Wang, Lizhe Liu, Bin Wang
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引用次数: 0

摘要

低地轨道(LEO)卫星互联网在经历了与地面网络竞争和补充地面网络两个阶段后,开始进入第三阶段,即构建与地面网络无缝覆盖全球的星地一体化网络。5G 新无线电(NR)是卫星互联网第三阶段的核心使能技术之一。本文重点研究如何基于5G NR,采用自适应传输方案,充分利用低地轨道卫星上的功率和带宽资源,最大限度地提高用户下行链路的吞吐量。针对低地轨道卫星超长传播时延、信道状态信息(CSI)过时、多场景动态等特点,导致在低地轨道卫星上应用5G自适应传输方案时实施成本高、性能大打折扣的问题,我们从自适应传输过程、信噪比(SNR)预测、调制编码方案(MCS)自适应切换策略等多个维度对基于5G NR的低地轨道卫星自适应传输方案进行了优化。仿真结果表明,与基于固定门限切换策略的自适应传输方案相比,在低地轨道卫星服务的动态多场景环境下,所提出的方案可将系统的平均吞吐量提高26.6%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
5G Integrated User Downlink Adaptive Transmission Scheme for Low Earth Orbit Satellite Internet Access Network

After the low-earth orbit (LEO) satellite Internet has gone through the two stages of competing with the terrestrial network and supplementing the terrestrial network, it has begun to enter the third stage of constructing the satellite-ground integrated network with the terrestrial network to provide seamless global coverage. 5G New Radio (NR) is one of the core enabling technologies of the third stage of satellite Internet. This paper focuses on how to make full use of the power and bandwidth resources on the LEO satellite by using adaptive transmission scheme to maximize the throughput of the user downlink based on 5G NR. To solve the problem that the ultra-long propagation delay, outdated channel state information (CSI) and dynamic multi-scenario of LEO satellite will lead to the high implementation cost and greatly reduced performance when applied the 5G adaptive transmission scheme to LEO satellites, we optimized the adaptive transmission scheme of 5G NR based LEO satellite from multiple dimensions such as adaptive transmission process, signal to noise ratio (SNR) prediction and modulation and coding scheme (MCS) adaptive switching strategy. The simulation results show that compared with the fixed threshold switching strategy based adaptive transmission scheme, the proposed scheme can improve the average throughput of the system by 26.6% under the dynamic multi-scenario environment served by the LEO satellite.

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