Satellite systems typically use physical and link layer reliability schemes to compensate the significant channel impairments, especially for the link between a satellite and a mobile end‐user. These schemes have been introduced at the price of an increase in the end‐to‐end delay, high jitter, or out‐of‐order packets. This is shown to have a negative impact both on multimedia and best‐effort traffic, decreasing the Quality of Experience (QoE) of users. In this paper, we propose to solve this issue by scheduling data transmission as a function of the channel condition. We first investigate existing scheduling mechanisms and analyze their performance for two kinds of traffic: VoIP and best‐effort. In the case of VoIP traffic, the objective is to lower both latency and jitter, which are the most important metrics to achieve a consistent VoIP service. We select the best candidate among several schedulers and propose a novel algorithm specifically designed to carry VoIP over LEO constellations. We then investigate the performance of the scheduling policies on internet‐browsing traffic carried by TCP, where the goal is now the maximize the users' goodput and select the best candidate in this case.

中文翻译：

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在LMS通道上调度LEO星座上的流

卫星系统通常使用物理层和链路层可靠性方案来补偿重大的信道损伤，尤其是对于卫星和移动最终用户之间的链路。引入这些方案的代价是端到端延迟，高抖动或无序包的增加。这对多媒体流量和尽力而为流量都有负面影响，降低了用户的体验质量（QoE）。在本文中，我们建议通过根据信道条件安排数据传输来解决此问题。我们首先研究现有的调度机制，并针对两种流量分析其性能：VoIP和尽力而为。对于VoIP流量，目标是降低延迟和抖动，这是获得一致VoIP服务的最重要指标。我们从几个调度器中选择最佳候选者，并提出一种新颖的算法，该算法专门设计用于在LEO星座上承载VoIP。然后，我们调查TCP承载的Internet浏览流量上的调度策略的性能，现在的目标是最大程度地提高用户的吞吐量，并在这种情况下选择最佳候选者。