| 摘要 |
<p>Methods, devices, and systems for saving battery service life by preventing false alarms when a tracked asset is intentionally removed from a base safe-zone. A portable safe-zone beacon may create a portable safe-zone by broadcasting signals similar to a transmitter within a base safe-zone. A tracking device may employ a relatively low-power short-range radio transceiver to receive safe-zone broadcasts. If the tracking device does not detect safe-zone broadcasts before a timing counter expires, the tracking device may activate a high-power, long-range transceiver and transmit an alarm message via a wireless network. The tracking device may distinguish between transmissions of the portable safe-zone beacon and a transmitter of the base safe-zone and may operate differently based on being within different safe-zones. In response to receiving broadcasts, the tracking device may transmit response messages to the portable safe-zone beacon. In an embodiment, devices may relay data to and from the tracking device.</p> |
