RFID reader and method for identifying RFID tag thereof and apparatus for analyzing reception power pattern

• US 8,362,902 B2
• Filed: 07/22/2010
• Issued: 01/29/2013
• Est. Priority Date: 07/24/2009
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Jun, Sungwoo, Kim, Ki Hak, Jung, Hoon, Park, Jong Heung
• Primary Examiner(s): PHAM, TOAN NGOC
• Application Number:
  US12/841,256
• Publication Number:
  US 20110018714A1
• Time in Patent Office: 922 Days
• Field of Search: 340/572.4, 340/572.1, 340/10.1, 340/10.4, 340/12.5, 340/12.51, 340/13.26, 235/385
• US Class Current: 340/572.4
• CPC Class Codes: G06K 7/0008 General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
• CPC Class Codes: G06K 7/10158 methods and means used by the interrogation device for reliably powering the wireless record carriers using an electromagnetic interrogation field

Abstract

A radio frequency identification (RFID) reader may extract a reception from the extracted reception power, and analyze the power pattern. Next, the RFID reader may determine whether the RFID tag is identified based on an power from a tag signal transmitted from an RFID tag, generate a power pattern analysis result of the power pattern.

Claims

1. A method for identifying a radio frequency identification (RFID) tag in an RFID reader, comprising:

receiving a tag signal transmitted from the RFID tag;

extracting a reception power from the tag signal;

generating a power pattern using the reception power; and

determining whether the RFID tag transmitting the tag signal is identified using the power pattern.

2. The method of claim 1, further comprising:

obtaining and storing tag information from the tag signal,

wherein the determining includes;

extracting a characteristic of the power pattern;

comparing the characteristic of the power pattern with a characteristic of a reference power pattern; and

deleting the tag information when the characteristic of the power pattern does not satisfy the characteristic of the reference power pattern.

3. The method of claim 2, wherein:

the characteristic of the power pattern includes a slope or a pattern shape.

4. The method of claim 1, wherein:

the generating includes

generating the power pattern from the reception power using at least one of an abnormal value analysis, a linear regression analysis algorithm, and a differentiation.

5. A radio frequency identification (RFID) reader for identifying an RFID tag, comprising:

a reader antenna to receive a tag signal transmitted from the RFID tag;

a coupler to extract a reception power of the tag signal;

a reception power pattern analyzer to generate a power pattern using the reception power, and to analyze the power pattern; and

a controller to obtain tag information from the tag signal, and to determine a validity of the tag information using an analysis result of the power pattern.

6. The RFID reader of claim 5, wherein:

the reception power pattern analyzer includes;

a collector to collect the reception power of the tag signal;

a pattern generator to generate the power pattern using the collected reception power; and

an analyzer to analyze the generated power pattern, to extract a characteristic of the power pattern, and to transfer the extracted characteristic of the power pattern to the controller.

7. The RFID reader of claim 6, wherein:

the collector collects the reception power for each time from the tag signal detected after the tag signal is initially detected.

8. The RFID reader of claim 6, wherein:

the controller deletes the obtained tag information when the characteristic of the power pattern does not satisfy a pattern of a reference power pattern.

9. The RFID reader of claim 5, further comprising:

a transmitter to transmit a radio frequency signal to the RFID tag,

wherein in response to the radio frequency signal, the tag signal is transmitted from the RFID tag.

10. An apparatus for analyzing a reception power pattern, comprising:

a collector to collect a reception power of a tag signal transmitted from a radio frequency identification (RFID) tag;

a pattern generator to generate a power pattern using the collected reception power; and

an analyzer to analyze the power pattern, to extract a characteristic of the power pattern, and to transfer characteristic information of the power pattern to an RFID reader,

wherein the RFID reader determines whether the RFID tag transmitting the tag signal is identified based on characteristic information of the power pattern.

11. The apparatus of claim 10, wherein:

the pattern generator generates the power pattern from the reception power using at least one of an abnormal value analysis, a linear regression analysis algorithm, and a differentiation.