Patent ID: 9438440
Filing Date: 2016-09-06
CPC Classification: G01S,H04L,H04W

Claim Text:
1. A method of operating a first Internet of Things (IoT) device that is configured to determine a proximity to a second IoT device, comprising: establishing a connection with the second IoT device; determining to execute a proximity detection procedure with the second IoT device; monitoring, via a microphone coupled to the first IoT device, for an audio emission over a first communication path from the second IoT device in response to the determination; receiving, at a first time point, a data packet that is transmitted by the second IoT device over a second communication path at substantially the same time as the audio emission is emitted by the second IoT device over the first communication path; detecting, at a second time point, the audio emission based on the monitoring; correlating the detected audio emission with the data packet based upon first correlation information that is embedded within the detected audio emission and configured to help identify a header field of the data packet; and calculating a distance estimate between the first and second IoT devices based at least in part upon the second time point.