按需TDMA，通过LoRa和唤醒接收器进行高能效数据汇集
On-Demand TDMA for Energy Efficient Data Collection with LoRa and Wake-up Receiver
摘要：
低功耗和长距离通信技术（如LoRa）在物联网应用中越来越受欢迎，因为它们能够以毫瓦的功耗覆盖数公里的范围。LoRa的主要缺点之一是网络中设备数量增加时的数据延迟和流量拥塞。特别是，由于LoRa终端节点的极端占空比而导致延迟，以降低整体能耗。为了克服这一缺点，我们提出了一种异构网络架构和一种节能的按需TDMA通信方案，提高了标准LoRa网络的设备寿命和数据延迟。我们结合了微瓦唤醒接收器的功能，以实现超低功耗状态和纯异步通信以及LoRa的远程连接。实验结果表明，数据可靠性为100%，往返延迟为毫秒级，终端设备在活动时的功耗小于46 mJ，在非活动期间为1.83 μW，使用1200 mAh锂电池可持续3年。
英文摘要：
Low-power and long-range communication tech- nologies such as LoRa are becoming popular in IoT applications due to their ability to cover kilometers range with milliwatt of power consumption. One of the major drawbacks of LoRa is the data latency and the traffic congestion when the number of devices in the network increases. Especially, the latency arises due to the extreme duty cycling of LoRa end-nodes for reducing the overall energy consumption. To overcome this drawback, we propose a heterogeneous network architecture and an energy-efficient On-demand TDMA communication scheme improving both the device lifetime and the data latency of standard LoRa networks. We combine the capabilities of micro- watt wake-up receivers to achieve ultra-low power states and pure asynchronous communication together with the long-range connectivity of LoRa. Experimental results show a data reliability of 100% and a round-trip latency on the order of milliseconds with end devices dissipating less than 46 mJ when active and 1.83 μW during periods of inactivity, lasting up to 3 years on a 1200 mAh Lithium battery.
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