Method and system for inventory count of articles with RFID tags
First Claim
1. A method for counting objects within defined area, using tag transceivers attached to each object and interrogating transmitters scattered at different places within the defined area, wherein each counting cycle is differentiated and identified and the tags avoid responding duplicate interrogation counting requests of the same identified counting cycle.
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Abstract
The present invention discloses a method for counting objects within defined area, using tag transceivers attached to each object and interrogating transmitters scattered at different places within the defined area. Each counting cycle is differentiated and identified and the tags avoid responding duplicate interrogation counting requests of the same identified counting cycle. The present invention improves the counting cycle by controlling data traffic transmission by dynamically changing the tags transmission probability parameter as a function of overall uncounted number of tags at each interrogation session. The present invention discloses a new transmission protocol for collisions'"'"' identification. Such protocol applies any modulating technique for the transmitted messages header, wherein the response transmissions are synchronized and include identical headers for identifying all received signals including corrupted signals.
84 Citations
35 Claims
- 1. A method for counting objects within defined area, using tag transceivers attached to each object and interrogating transmitters scattered at different places within the defined area, wherein each counting cycle is differentiated and identified and the tags avoid responding duplicate interrogation counting requests of the same identified counting cycle.
- 10. A method for counting objects within defined area, using tag transceivers attached to each object and interrogating transmitters scattered at different places within the defined area, said method characterized by controlling data traffic transmission by dynamically changing a transmission probability parameter as a function overall uncounted number of tags at each interrogation session, wherein said probability parameter determines the probability of each tag to transmit at a given period.
- 19. A method for counting objects within a defined area, using tag transceivers attached to each object and interrogating transmitters scattered at different places within said defined area, said method characterized by a transmission protocol for collisions'"'"' identification, said protocol applies any modulating technique for the transmitted messages header, wherein the response transmissions are synchronized and include identical headers for identifying most received signals including corrupted signals.
- 27. A method for counting objects within a defined area, using passive tag transceivers attached to each object and interrogating transmitters scattered at different places within said defined area, said method characterized by using at least two energy levels, wherein the lower energy level is for communication and the higher energy level is for charging energy enabling the tag to synchronize and communicate with distance interrogating stations.
- 30. A method for counting objects within a defined area, using active tag transceivers attached to each object and interrogating transmitters scattered at different places within said defined area, said method characterized by using at least three energy levels for operating active tags, wherein the higher energy level is used for awakening the active tag, the medium energy level is used for charging and synchronizing the active tag and the lower level for communication.
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33. A method for counting objects within a defined area, using active tag transceivers attached to each object and interrogating transmitters scattered at different places within said defined area, said method characterized by activating the active tags only for periodical time intervals, wherein the continuous interrogating sessions are preformed at the respective (active) time periods.
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35. A method for counting objects within a defined area, using tag transceivers attached to each object and interrogating transmitters scattered at different places within said defined area, said method characterized by multiple transmission frequencies, wherein lower transmission frequencies are used for interrogating tags through conductive obstructed environment.
Specification