Combating link dynamics for reliable lora connection in urban settings

Shuai Tong, Zilin Shen, Yunhao Liu, Jiliang Wang
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引用次数: 26

Abstract

LoRa, as a representative Low-Power Wide-Area Network (LPWAN) technology, can provide long-range communication for battery-powered IoT devices with a 10-year lifetime. LoRa links in practice, however, experience high dynamics in various environments. When the SNR falls below the threshold (e.g., in the building), a LoRa device disconnects from the network. We propose Falcon, which addresses the link dynamics by enabling data transmission for very low SNR or even disconnected LoRa links. At the heart of Falcon, we reveal that low SNR LoRa links that cannot deliver packets can still introduce interference to other LoRa transmissions. Therefore, Falcon transmits data bits on the low SNR link by selectively interfering with other LoRa transmissions. We address practical challenges in Falcon design. We propose a low-power channel activity detection method to detect other LoRa transmissions for selective interference. To interfere with the so-called interference-resilient LoRa, we accurately estimate the time and frequency offsets on LoRa packets and propose an adaptive frequency adjusting strategy to maximize the interference. We implement Falcon, all using commercial off-the-shelf LoRa devices, and extensively evaluate its performance. The results show that Falcon can provide reliable communication links for disconnected LoRa devices and achieves the SNR boundary upto 7.5 dB lower than that of standard LoRa.
在城市环境中对抗链路动态以实现可靠的lora连接
LoRa作为低功耗广域网(Low-Power Wide-Area Network, LPWAN)技术的代表,可以为电池供电的物联网设备提供远程通信,使用寿命为10年。但是,LoRa链接在实践中会在各种环境中经历高度动态。当信噪比低于阈值时(例如,在建筑物中),LoRa设备与网络断开连接。我们提出Falcon,它通过在非常低的信噪比甚至断开的LoRa链路上实现数据传输来解决链路动态问题。在Falcon的核心,我们揭示了不能传输数据包的低信噪比LoRa链路仍然会给其他LoRa传输带来干扰。因此,Falcon通过选择性地干扰其他LoRa传输,在低信噪比链路上传输数据位。我们解决猎鹰设计中的实际挑战。我们提出了一种低功率信道活动检测方法来检测其他LoRa传输的选择性干扰。为了干扰所谓的抗干扰LoRa,我们准确地估计了LoRa数据包的时间和频率偏移,并提出了一种自适应频率调整策略来最大化干扰。我们使用商用的LoRa设备来实现Falcon,并对其性能进行了广泛的评估。结果表明,Falcon可以为断开的LoRa设备提供可靠的通信链路,并实现比标准LoRa低7.5 dB的信噪比边界。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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