AI 中文总结
研究低地球轨道卫星通信在实际服务条件下的性能，通过开发符合3GPP标准的系统级模拟器，纳入非全缓冲流量模型，评估UE吞吐量、RB分配率和分组延迟等指标，为非全缓冲LEO卫星通信提供性能展望和用户体验洞察。
AI 中文摘要
随着低地球轨道（LEO）卫星通信在全球范围内初具规模，系统级评估对于深入了解其性能特征至关重要。大多数现有研究依赖全缓冲假设，掩盖了实际用户设备（UE）流量的异质性和间歇性。本文通过纳入非全缓冲流量模型评估LEO卫星通信在实际服务条件下的性能。为此，开发了符合第三代合作伙伴计划（3GPP）技术报告38.811和38.821中规定的信道建模和评估方法的系统级模拟器。考虑了三个关键系统级性能指标：UE吞吐量、资源块（RB）分配率和分组延迟，并在不同流量模型下对3GPP LEO卫星研究案例进行评估。吞吐量结果表征了可实现数据速率的分布，RB分配分析揭示了随着UE密度变化的资源消耗模式，延迟分析表征了延迟行为。这些评估为非全缓冲LEO卫星通信提供了实际性能展望，并深入了解了实际运行条件下的用户体验。
英文摘要
As low Earth orbit (LEO) satellite communications take shape on a global scale, system-level evaluation has become essential for a rigorous understanding of their performance characteristics. Most existing studies have relied on a full-buffer assumption, which obscures the heterogeneity and intermittency that characterize actual user equipment (UE) traffic. This article evaluates the performance of LEO satellite communications under realistic service conditions through the incorporation of non-full-buffer traffic models. To this end, we develop a system-level simulator that complies with the channel modeling and evaluation methodologies specified in 3rd Generation Partnership Project (3GPP) technical reports 38.811 and 38.821. Three key system-level performance metrics are considered: UE throughput, resource block (RB) allocation ratio, and packet delay, which are evaluated across 3GPP LEO satellite study cases under diverse traffic models. The throughput results characterize the distribution of achievable data rates, which delineates the practical operating boundaries of the system. The RB allocation analysis reveals patterns of resource consumption as UE density varies, which provides a quantitative basis for assessing system capability. Furthermore, the delay analysis characterizes latency behavior, which is of particular importance in satellite environments where substantial propagation delays are inherent and must be examined to ensure service feasibility. These evaluations provide a realistic performance outlook for non-full-buffer LEO satellite communications and provide insight into the user experience under practical operating conditions.
Comments9 pages, 3 figures. Submitted to IEEE Network
