WUR-TS: Semi-Passive Wake-Up Radio Receiver Based Time Synchronization Method for Energy Harvesting Wireless Networks
WUR-TS: Semi-Passive Wake-Up Radio Receiver Based Time Synchronization Method for Energy Harvesting Wireless Networks
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DOI：
10.1109/tmc.2021.3064374
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发表时间：
2022-11
影响因子：
7.9
通讯作者：
Yu Luo;Lina Pu
中科院分区：
文献类型：
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作者：
Yu Luo;Lina Pu
针对能量收集无线网络，提出了一种基于半被动唤醒无线电接收机的时间同步方法。在WUR-TS中，能量收集节点（EHN）不交换任何定时信息，而是仅接收由中心节点周期性广播的唤醒信号以在整个网络中同步时间。基于实验数据，开发了一个模型，以准确地估计每个唤醒信号的到达时间。利用该模型，EHN可以计算复杂无线电环境下的时钟漂移。我们已经实现了WUR-TS与最低数量的商业组件。实验结果表明，当电源电压为2.8 V，接收唤醒信号强度大于33 dBm时，WUR-TS可以达到3 μs的同步精度。WUR-TS是一种超低功耗同步方法。如果没有检测到唤醒信号，则每个EHN的功耗为3.2 $\mu$μW。如果检测到唤醒信号，EHN仅消耗3.6 μJ的能量来完成时间同步。
In this paper, a semi-passive wake-up radio receiver based time synchronization (WUR-TS) method is developed for energy harvesting wireless networks. In WUR-TS, energy harvesting nodes (EHNs) do not exchange any timing information, but only receive the wake-up signal broadcast periodically by the central node to synchronize time throughout the network. Based on the experimental data, a model is developed to accurately estimate the arrival time of each wake-up signal. By using this model, the EHN can calculate its clock drift in complex radio environments. We have implemented WUR-TS with a minimum number of commercial components. According to the experimental results, WUR-TS can achieve a synchronization accuracy of 3 $\mu$μs when the power supply voltage is 2.8 V and the received wake-up signal strength is higher than $-$-33 dBm. WUR-TS is an ultra-low-power synchronization method. If no wake-up signal is detected, the power consumption of each EHN is 3.2 $\mu$μW. If the wake-up signal is detected, the EHN consumes only 3.6 $\mu$μJ of energy to complete time synchronization.