使用唤醒接收器量化低功耗蓝牙延迟与功耗之间的权衡

Maryam Dodangeh, M. S. O. Alink, B. Nauta
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引用次数: 0

摘要

低功耗蓝牙(BLE)由于其固有的低能耗,是物联网(IoT)设备的主要无线通信协议之一。BLE的占空比方案降低了能耗,但代价是延迟。已经提出了唤醒接收器(WuRX)来缓解这种权衡,但大多数注意力似乎都集中在电路设计上,而不是评估WuRX的确切益处。在本文中,我们分析了为相关物联网场景在最先进的商用BLE收发器中添加的$\boldsymbol{200\mu \text{W WuRX}}$的功耗和延迟影响。结果表明,对于启动连接的外围设备和中心设备来说,延迟/功耗权衡可以显著放松。此外,如果可以改变中心和外设的角色(外设扫描而不是发布),那么在需要少于200ms延迟启动连接的场景中,最受能量限制的设备的功耗可以进一步降低。此外,对于最大延迟为4s的情况,占空比的WuRX使中心设备和外围设备的平均功耗相等。当链路的两端面临类似的电池限制时,这是非常有用的,就像在许多物联网场景中一样。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Quantifying the Trade-off Between Latency and Power Consumption in Bluetooth Low Energy and Its Mitigation by Using a Wake-Up Receiver
Bluetooth Low Energy (BLE) is one of the primary wireless communication protocols for Internet of Things (IoT) devices due to its inherently low energy consumption. BLE's duty-cycled scheme reduces energy consumption, but at the cost of latency. Wake-Up Receivers (WuRXs) have been proposed to mitigate this trade-off, but most attention seems to have been paid to the circuit design rather than assessing exactly how beneficial a WuRX could be. In this paper, we analyze the power consumption and latency impact of a $\boldsymbol{200\mu \text{W WuRX}}$ added to a state-of-the-art commercial BLE transceiver for relevant IoT scenarios. The results show that the latency/power trade-off can be significantly relaxed for both peripheral and central devices in initiating a connection. Furthermore, if the role of central and peripherals can be changed (peripherals scan instead of advertise), the power consumption of the most energy-constrained devices can be further reduced in scenarios that require less than 200ms latency to initiate a connection. Also, for a maximum latency of 4s, a duty-cycled WuRX enables equal $\boldsymbol{60}\mu \mathbf{W}$ average power consumption for both the central and peripheral devices. This is extremely useful when both ends of the link face similar battery constraints, as would be the case in many IoT scenarios.
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