Duty-Cycle-Aware Real-Time Scheduling of Wireless Links in Low Power WANs
Duty-Cycle-Aware Real-Time Scheduling of Wireless Links in Low Power WANs
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DOI：
10.1109/dcoss.2018.00015
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发表时间：
2018-06
期刊：
影响因子：
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通讯作者：
Md Tamzeed Islam;Bashima Islam;S. Nirjon
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文献类型：
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作者：
Md Tamzeed Islam;Bashima Islam;S. Nirjon
低功耗广域网（LPWAN）非常适合城市规模的物联网应用，因为它们的距离长，电池寿命长达数年，数据速率为25- 50 kbps，足以承载物联网流量。然而，基于LPWAN的实时无线网络的实际限制是FCC对sub-1GHz频带施加的占空比限制。在本文中，我们克服了这一挑战，提出了第一个占空比感知的无线链路调度算法的实时LPWAN，认为数据包的紧迫性以及无线信道的可用性。所提出的算法是在一个五节点，广域户外测试床在多个现实世界的情况下实现。提供模拟结果以量化其在不同设置下的性能（例如，较大的网络，各种工作负载和多个基线）。在现实世界的部署和模拟，所提出的算法优于标准调度算法的链路可扩展性，截止日期错过，和缓冲区大小。
Low Power Wide Area Networks (LPWANs) are an excellent fit to city-scale IoT applications becuase of their long range and a battery life of several years, and a data rate of 25-50kbps, which is sufficient to carry IoT traffic. However, a practical limitation of a LPWAN-based real-time wireless network is the duty-cycle limit imposed on the sub-1GHz band by the FCC. In this paper, we overcome this challenge by proposing the first duty-cycle-aware wireless link scheduling algorithm for real-time LPWANs that considers the urgency of the packets as well as the availability of the wireless channels. The proposed algorithm is implemented in a five-node, wide-area outdoor test-bed in multiple realworld scenarios. Simulation results are provided to quantify its performance under different settings (e.g. larger networks, variety of workloads, and multiple baselines). In both realworld deployments and simulations, the proposed algorithm outperforms standard scheduling algorithms in terms of link schedulability, deadline misses, and buffer size.