CPC H04W 52/0229 (2013.01) [H04B 17/318 (2015.01); H04B 17/336 (2015.01); H04L 9/32 (2013.01); H04W 12/03 (2021.01); H04W 12/08 (2013.01); H04W 84/18 (2013.01)] | 22 Claims |
1. A wake-up radio system in a wireless sensor network, the wake-up radio comprising:
an analog front end configured to communicate with a matching network; wherein the matching network receives beacon signals from multiple channels simultaneously, wherein scanning consists of scanning in time rather than frequency, and wherein scanning comprises listening for best beacon signals comprising beacons with highest received signal strength indicator (RSSI);
an analog to digital converter coupled to the analog front end; and
a digital baseband coupled to the analog to digital converter, wherein the digital baseband outputs a fast wake-up signal, a secure wake-up signal and a clock signal, wherein for a secure wakeup signal, a header is demodulated in a physical layer and a secure payload is passed through a cryptographic checksum before issuing a wakeup signal, and wherein the wake-up radio computes the signal to noise to interference (SNIR) as reported by the digital baseband and participates in an association message sequence that comprises a node in the wireless sensor network being assigned a gateway-specific beacon key.
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