RFID TAG READER, RFID TAG READING SYSTEM, METHOD FOR PERFORMING RFID TAG READING PROCESS AND COMPUTER-READABLE RECORDING MEDIUM

• US 20130169417A1
• Filed: 12/14/2012
• Published: 07/04/2013
• Est. Priority Date: 12/28/2011
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: SUGANO, Hiroyasu, Shiotsu, Shinichi, Tanaka, Hideki, Yokota, Koichi, Itasaki, Akira, Yamashita, Daisuke
• Granted Patent: US 9,129,165 B2
• Time in Patent Office: Days
• US Class Current: 340/10.1
• CPC Class Codes: G06K 7/01 Details
• CPC Class Codes: G06K 7/10108 interrogating only those RFIDs that fulfill a predetermined requirement, e.g. selecting all RFIDs having the same speed and moving in a cloud like fashion, e.g. on the same train; interrogating only RFIDs having a certain predetermined temperature, e.g. in the same fridge, another possibility being the active ignoring of a group of tags that fulfill a predetermined requirement, equivalent to the Boolean NOT operation

Abstract

An RFID tag reader is disclosed that includes a signal intensity obtaining part configured to obtain signal intensities of a first RFID tag and a second RFID tag that are read at plural read processes, a read-number obtaining part configured to obtain a number of RFID tags, among the first and the second RFID tags, that are read at the same read process, a processing part configured to weight the signal intensity of the first RFID tag obtained by the signal intensity obtaining part based on the number obtained at the corresponding read process, and a selecting part configured to select a read result of the first RFID tag based on the signal intensity of the first RFID tag weighted by the processing part.

Claims

1. An RFID tag reader comprising:

a signal intensity obtaining part configured to obtain signal intensities of a first RFID tag and one or more second RFID tags that are read at plural read processes;

a read-number obtaining part configured to obtain a number of RFID tags, among the first and the second RFID tags, that are read at the same read process;

a processing part configured to weight the signal intensity of the first RFID tag obtained by the signal intensity obtaining part based on the number obtained at the corresponding read process; and

a selecting part configured to select a read result of the first RFID tag based on the signal intensity of the first RFID tag weighted by the processing part.

2. The RFID tag reader as claimed in claim 1, wherein the processing part weights the signal intensity based on a ratio of the number and a designated reference value.

3. The RFID tag reader as claimed in claim 2, wherein the designated reference value is the maximum value of the number obtained by the read-number obtaining part.

4. The RFID tag reader as claimed in claim 1, wherein the processing part calculates a sum of the signal intensities that are weighted based on the numbers obtained at the corresponding read processes, and

wherein the selecting part selects the read result of the first RFID tag of which the sum is greater than a designated reference value.

5. The RFID tag reader as claimed in claim 1, wherein the processing part calculates a similarity of a read pattern data which represents time series of the signal intensities obtained at plural read processes and a reference pattern data while weighting the signal intensities based on the numbers obtained at the corresponding read processes, and

wherein the selecting part selects the read result of the first RFID tag of which the similarity is greater than a designated reference value.

6. An RFID tag reading system comprising:

the RFID tag reader as claimed in claim 1;

an antenna configured to be connected to the signal intensity obtaining part, and to read the first RFID tag and the second RFID tag; and

a processing unit configured to receive the read result which is selected by the selecting part.

7. A method for performing RFID tag reading process comprising:

first obtaining signal intensities of a first RFID tag and a second RFID tag that are read at plural read processes;

second obtaining a number of RFID tags, among the first and the second RFID tags, that are read at the same read process;

weighting the signal intensity of the first RFID tag obtained by the first obtaining based on the number obtained at the corresponding read process; and

selecting read results of the first RFID tag based on the signal intensity of the first RFID tag weighted by the weighting.

8. A computer-readable, non-transitory medium storing a program which, when executed by a computer, causes the computer to perform a reading process, the reading process comprising:

first obtaining signal intensities of a first RFID tag and a second RFID tag that are read at plural read processes;

second obtaining a number of RFID tags, among the first and the second RFID tags, that are read at the same read process;

weighting the signal intensity of the first RFID tag obtained by the first obtaining based on the number obtained at the corresponding read process; and

selecting read results of the first RFID tag based on the signal intensity of the first RFID tag weighted by the weighting.