System and method for location recognition using IC tags

Communications: electrical – Condition responsive indicating system – Specific condition

Reexamination Certificate

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C235S375000, C235S385000

Reexamination Certificate

active

07605699

ABSTRACT:
Locations of IC tags affixed to items are automatically recognized without requiring interrogators or antennas are allocated at respective inventory locations.To attain this object, interrogator1firstly transmits a unique ID readout command specifying read range, and corresponding IC tags2a,2b,2csequentially reply their unique IDs (Xa), (Xb), (Xc) respectively.At the same time, interrogator1transmits a probe signal send out command specifying ID, and corresponding IC tags2a,2b,2csequentially send out probe signals respectively.IC tag2that detects a probe signal with reception strength more than a predetermined level stores in its memory IDs (Xa), (Xb), (Xc) that interrogator1specified as adjacent ID.Then, interrogator1transmits an adjacent ID readout command specifying ID, and corresponding IC tags2a,2b,2csequentially reply adjacent IDs (Xb), (Xa.Xc), (Xb) stored in their memory respectively.Lastly, all possible combinations (Xa-Xb), (Xb-Xa), (Xb-Xc), (Xc-Xb) of unique IDs (Xa), (Xb), (Xc) and adjacent IDs (Xb), (Xa.Xc), (Xb) that controller3has collected via interrogator1are obtained and any identical combinations are excluded so that (Xa-Xb), (Xb-Xc) remain as final combinations, and the final combinations having one side in common are joined to produce a link pattern of ID information.Thus, it is understood that IC tags2a,2b,2cexist in the same communication area B, and are arranged in order of2a,2b,2c.

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patent: 2003-158470 (2003-05-01), None
patent: 2004-038621 (2004-02-01), None
patent: 02/103645 (2002-12-01), None
English language Abstract of JP 2003-158470.
English language Abstract of JP 2004-038621.

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