Haltian Oy

Pertti Kujala

Juha Pikkarainen

Jyrki Okkonen

Marko Parttimaa

Teemu Vaattovaara

Ville Ylläsjärvi

Jussi Kivilinna

Aleksandre Pekki

Active radio-frequency identification, RFID, tag, and a product surveillance method using active RFID tags. The method includes: transmitting (), by an active RFID tag, continuously a signal comprising an own identifier according to a predetermined schedule; receiving (), by the active RFID tag, continuously a plurality of signals comprising a plurality of foreign identifiers transmitted by a plurality of other active RFID tags according to the predetermined schedule; measuring (), by the active RFID tag, a received signal strength indication, RSSI, of each received signal; storing (), by the active RFID tag, each foreign identifier of a signal whose RSSI exceeds a predetermined strength threshold; detecting (), by the active RFID tag, that a signal with a stored foreign identifier is no more received according to the predetermined schedule and marking (), by the active RFID tag, said stored foreign identifier.

Active RFID tag and product surveillance method

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Oulu, Finland

Pertti Kujala