SMART ENERGY SCAVENGING TAG SENSOR

摘要

A smart tag reading system is provided that has the ability to query sensor tags that have energy harvesting capability. In one embodiment, an adaptive reader system learns the state of each tag and how long the tag takes to charge. Tags that charge relatively quickly can be accessed more frequently. Others that do not charge as quickly, readings can be performed at much longer intervals allowing the tag a longer time to gather enough energy to complete the transaction. The reader query system can then adapt to the environment and state of the individual tags.

主权项

1. An RFID reader comprising:
an antenna that sends interrogation signals to an RFID tag at first time intervals, wherein the RFID tag harvests energy from a source other than the RFID reader; a controller that:
identifies responses received from the RFID tag in response to the interrogation signals sent to the RFID tag,in response to a determination that the RFID tag did not respond to at least one of the interrogation signals, the controller decreases the first time interval to a second time interval;sets an interrogation signal interval of the RFID reader to the second time interval so that the antenna the interrogation signals are sent at the second time intervals.