Conclusion

We present CosMAC – a constellation-aware medium access and scheduling system for picosat-based IoT networks. CosMAC leverages satellite-specific insights at the constellation scale. Specifically, CosMAC introduces: 1) a novel overlapaware uplink protocol for IoT devices to satellites, and 2) a novel one-to-many downlink scheduling algorithms for satellites to ground stations. We evaluate CosMAC using a combination of real-world measurements and trace-driven simulation. We found that CosMAC’s new link-layer enhancements improve IoT picosat networks for important network features across the board including network throughput, fairness, and robustness. We hope our measurements, insights, and simulation frameworks will enable the academic community to identify and solve new challenges in this space.

我们提出了CosMAC —— 一个为基于微型卫星的物联网网络设计的星座感知介质访问与调度系统。CosMAC在星座尺度上利用了针对卫星特性的洞见。具体而言，CosMAC引入了：

1) 一种新颖的、用于物联网设备到卫星的重叠感知上行链路协议；

2) 一种新颖的、用于卫星到地面站的一对多下行链路调度算法

我们结合真实世界的测量数据和迹驱动的模拟来对CosMAC进行评估。我们发现，CosMAC全新的链路层增强功能全面提升了物联网微型卫星网络的重要特性，包括网络吞吐量、公平性和鲁棒性。我们希望我们的测量数据、洞见以及模拟框架能够帮助学术界识别并解决该领域的新挑战。