Proximity detection and alerting

Abstract

A method of monitoring a portable electronic device electronically is provided. The method comprises receiving a first radio signal, the first radio signal emitted by the electronically monitored portable electronic device and determining a first received signal strength of the first radio signal. The method also comprises receiving a second radio signal, the second radio signal emitted by the electronically monitored portable electronic device, the second radio signal received after the first radio signal. The method also comprises determining a second received signal strength of the second radio signal, comparing the second received signal strength to the first received signal strength, and alerting when a result of the comparing exceeds a threshold.

Dependencies are inferred from the claim text.