Wireless networks, including mesh networks, can not only transmit information among various network devices but can also monitor changes or variations in the transmission signals used to communicate the information. Monitoring changes or variations in transmission signals can indicate presence, motion, lack of motion, or other characteristics about the physical space in which the wireless network operates without the need for additional equipment or dedicated devices.
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Cai, Zhifeng and Wen, Yu, "Human Movement Detection in Wi-Fi Mesh Networks", Technical Disclosure Commons, (December 07, 2017)