Guo Qingjie, Yang Fengxu, Wei Jianming
Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China.
University of Chinese Academy of Sciences, Beijing 100049, China.
Sensors (Basel). 2021 Feb 4;21(4):1071. doi: 10.3390/s21041071.
LoRa technology is currently one of the most popular Internet of Things (IoT) technologies. A substantial number of LoRa devices have been applied in a wide variety of real-world scenarios, and developers can adjust the packet reception performance of LoRa through physical layer parameter configuration to meet the requirements. However, since the important details of the relationship between the physical layer parameters and the packet reception performance of LoRa remain unknown, it is a challenge to choose the appropriate parameter configuration to meet the requirements of the scenarios. Moreover, with the increase in application scenarios, the requirements for energy consumption become increasingly high. Therefore, it is also a challenge to know how to configure the parameters to maximize the energy efficiency while maintaining a high data rate. In this work, a complex evaluation experiment on the communication capability under a negative Signal to Noise Ratio is presented, and the specific details of the relationship between physical layer parameters and the packet reception performance of LoRa are clarified. Furthermore, we study the impact of the packet length on the packet reception performance of LoRa, and the experimental results show that when there is a large amount of data to be transmitted, it is better to choose long packets instead of short packets. Finally, considering the influence of physical layer parameters and the packet length on the packet reception performance of LoRa, the optimal parameter combination is explored, so as to propose a transmission scheme with a balanced reliability, delay, and energy consumption. This scheme is the first to consider the physical layer parameters and packet length together to study the communication transmission scheme, which reduces the communication time by 50% compared with the traditional transmission scheme and greatly reduces the energy consumption.
LoRa技术是目前最流行的物联网（IoT）技术之一。大量的LoRa设备已应用于各种现实世界场景中，开发人员可以通过物理层参数配置来调整LoRa的数据包接收性能，以满足需求。然而，由于LoRa物理层参数与数据包接收性能之间关系的重要细节仍不明确，选择合适的参数配置以满足场景需求是一项挑战。此外，随着应用场景的增加，对能耗的要求越来越高。因此，如何在保持高数据速率的同时配置参数以最大化能源效率也是一项挑战。在这项工作中，提出了一项在负信噪比下对通信能力进行的复杂评估实验，并阐明了物理层参数与LoRa数据包接收性能之间关系的具体细节。此外，我们研究了数据包长度对LoRa数据包接收性能的影响，实验结果表明，当有大量数据要传输时，最好选择长数据包而不是短数据包。最后，考虑到物理层参数和数据包长度对LoRa数据包接收性能的影响，探索了最优参数组合，从而提出了一种可靠性、延迟和能耗平衡的传输方案。该方案首次将物理层参数和数据包长度结合起来研究通信传输方案，与传统传输方案相比，通信时间减少了50%，并大大降低了能耗。
