System and method for location recognition using ic tags
First Claim
3-1. The system for location recognition using IC tags as described in claim 1, wherein communication range of said communication area B is adjusted at different lengths depending on sizes and arrangement of items to which said IC tags are affixed.
3 Assignments
0 Petitions
Accused Products
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, interrogator 1 firstly transmits a unique ID readout command specifying read range, and corresponding IC tags 2a, 2b, 2c sequentially reply their unique IDs (Xa), (Xb), (Xc) respectively.
At the same time, interrogator 1 transmits a probe signal send out command specifying ID, and corresponding IC tags 2a, 2b, 2c sequentially send out probe signals respectively.
IC tag 2 that detects a probe signal with reception strength more than a predetermined level stores in its memory IDs (Xa), (Xb), (Xc) that interrogator 1 specified as adjacent ID.
Then, interrogator 1 transmits an adjacent ID readout command specifying ID, and corresponding IC tags 2a, 2b, 2c sequentially 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 controller 3 has collected via interrogator 1 are 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 tags 2a, 2b, 2c exist in the same communication area B, and are arranged in order of 2a, 2b, 2c.
28 Citations
7 Claims
-
3-1. The system for location recognition using IC tags as described in claim 1, wherein communication range of said communication area B is adjusted at different lengths depending on sizes and arrangement of items to which said IC tags are affixed.
-
7. A method for location recognition using IC tags, wherein an interrogator makes a first communication with multiple IC tags existing in a communication area A by radio, and at the same time, said IC tag makes a second communication with other IC tags existing in a communication area B (<
- A) by probe signals, said IC tag comprising;
a first response step in which said IC tag responds own information X to the interrogator, a transmission step in which said IC tag sends out said probe signals to the other IC tags when own information X is specified by the interrogator, a reception step in which said IC tag receives said probe signals sent out by one of the other IC tags whose information Y is specified by the interrogator, a storage step in which said IC tag stores information Y of the other IC tag specified as a source by the interrogator in a memory when reception strength of said probe signal is more than a predetermined level, and a second response step in which said IC tag responds information Y of the source IC tag stored in the memory to the interrogator according to a second readout command, whereby relative positions of said IC tags are recognized from the information X and the information Y collected via said interrogator.
- A) by probe signals, said IC tag comprising;
Specification