Low Earth orbit (LEO) mega-constellation satellite networks have shown great potential to extend the coverage capability of conventional terrestrial networks. How to systematically define, quantify, and assess the technical performance of LEO mega-constellation satellite networks remains an open issue. In this paper, we propose a comprehensive key performance indicator (KPI) framework for mega-constellation based LEO satellite networks. An efficient LEO constellation oriented performance evaluation methodology is then carefully designed by resorting to the concept of interfering area and spherical geographic cell. We have carried out rigorous system-level simulations and provided numerical results to assess the KPI framework. It can be observed that the achieved area traffic capacity of the reference LEO constellation is around 4 Kbps/km2, with service availability ranging from 0.36 to 0.39. Besides, the average access success probability and handover failure rate is approximate to 96% and 10%, respectively, in the nearest satellite association scheme.

翻译：低地球轨道（LEO）巨型星座卫星网络在扩展传统地面网络覆盖能力方面展现出巨大潜力。如何系统性地定义、量化及评估LEO巨型星座卫星网络的技术性能仍是一个开放性问题。本文提出了一套面向巨型星座LEO卫星网络的综合性关键性能指标（KPI）框架。通过引入干扰区域和球形地理单元格概念，我们精心设计了一种高效的LEO星座导向性能评估方法。我们进行了严谨的系统级仿真，并提供了数值结果以评估该KPI框架。观测结果表明，参考LEO星座实现的区域流量容量约为4 Kbps/km²，服务可用性介于0.36至0.39之间。此外，在最近卫星关联方案中，平均接入成功概率约为96%，切换失败率约为10%。