摘要 |
A low-power RFID sensor tag (100) comprises a processor (102), a power source (106), an RF transceiver (112, 114, 116), one or more sensors (108) accessible to the processor via a sensor interface, and at least one memory device (104). In one aspect, the tag (100) is configured to operate in three power-consumption states: a low power-consumption state; a medium power-consumption state in which sensor measurements are performed; and a high power-consumption state used when engaged in RF communications. In another aspect, power consumption and memory usage are reduced by configuring the tag (100) to record sensor data only upon satisfaction of a predetermined condition. In a further aspect, the tag (100) is configured to respond to an RF interrogation signal only when the signal comprises an instruction in accordance with a predetermined communications protocol. In another aspect, the tag is configured, upon interrogation, to confirm whether new recorded sensor data is available as a preliminary step, to minimise transmission in the event that no new data is available. |
申请人 |
NEWPORT DIGITAL TECHNOLOGIES AUSTRALIA PTY LTD |
发明人 |
DESAI, ANIRUDDHA ANIL;SHAH, KRIYANGBHAI VINODBHAI;FITRIO, DAVID;FERNANDO, MUTHUTHANTHREEGE LASITH ERANGA;SINGH, JUGDUTT |