WIRELESS TAG DETERMINATION SYSTEM AND WIRELESS TAG DETERMINATION METHOD

• US 20070205866A1
• Filed: 02/21/2007
• Published: 09/06/2007
• Est. Priority Date: 02/22/2006
• Status: Active Grant

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Tanaka, Satoshi, Yamazaki, Kenichi, Sakamoto, Kenji, Isoda, Yoshinori, Kunito, Goro
• Granted Patent: US 7,952,465 B2
• Time in Patent Office: Days
• US Class Current: 340/10.100
• CPC Class Codes: H04W 12/06 Authentication
• CPC Class Codes: H04W 12/10 Integrity
• CPC Class Codes: H04W 12/61 Time-dependent
• CPC Class Codes: Y04S 40/20 Information technology specific aspects, e.g. CAD, simulation, modelling, system security

Abstract

A wireless tag determination system includes a detection information storage configured to store information detected from a wireless tag by a tag reader, as detection information. A determination requesting unit is configured to request a determination for reliability of existence of the wireless tag within a detection range of the tag reader. A reliability determination unit is configured to determine the reliability by use of the detection information, in response to the request.

Claims

1. A wireless tag determination system comprising:

a detection information storage configured to store information detected from a wireless tag by a tag reader, as detection information;

a determination requesting unit configured to request a determination for reliability of existence of the wireless tag within a detection range of the tag reader; and

a reliability determination unit configured to determine the reliability by use of the detection information, in response to the request.

2. The wireless tag determination system according to claim 1, further comprising a periodicity information holder configured to hold periodicity information indicating a transmission cycle of the wireless tag,

wherein the reliability determination unit determines the reliability by further using the periodicity information.

3. The wireless tag determination system according to claim 2, further comprising an attribute information holder configured to hold attribute information indicating an attribute of an object to which the wireless tag is attached,

wherein the reliability determination unit determines the reliability by further using the attribute information.

4. The wireless tag determination system according to claim 3, wherein the reliability determination unit comprises:

an elapsed time calculator configured to calculate elapsed time information indicating an elapsed time which is from a time of the last detection of the wireless tag to a time of the request, by use of the detection information;

a non-detection frequency calculator configured to calculate, by use of the periodicity information, non-detection frequency information indicating the number of times that the wireless tag is not detected during the elapsed time, at time points when the wireless tag is supposed to be detected; and

a reliability calculator configured to calculate the reliability in accordance with the non-detection frequency information.

5. The wireless tag determination system according to claim 4, wherein the reliability determination unit further comprises a mobility probability determination unit configured to determine a mobility probability representing a frequency of movements of the object to which the wireless tag is attached, in accordance with the attribute information,

wherein the reliability calculator calculates the reliability by further using the mobility probability.

6. The wireless tag determination system according to any one of claims 4 and 5, wherein the reliability determination unit further comprises a detection failure rate calculator configured to calculate a detection failure rate which is equivalent to a probability of failing to detect the wireless tag accurately in each transmission cycle, on the basis of the detection information and the periodicity information,

wherein the reliability calculator calculates the reliability by further using the detection failure rate.

7. The wireless tag determination system according to claim 2, wherein the periodicity information holder estimates the transmission cycle by use of the detection information, and holds the estimated transmission cycle.

8. The wireless tag determination system according to claim 1, wherein

the detection information storage further stores electric power transmission interval information indicating a time interval for transmitting electric power from the tag reader to the wireless tag, and

the reliability determination unit determines the reliability by further using the electric power transmission interval information.

9. The wireless tag determination system according to claim 8, further comprising an attribute information holder configured to hold attribute information indicating an attribute of an object to which the wireless tag is attached,

wherein the reliability determination unit determines the reliability by further using the attribute information.

10. A wireless tag determination method comprising the steps of:

storing information detected from a wireless tag by a tag reader, as detection information;

requesting a determination for reliability of existence of the wireless tag within a detection range of the tag reader; and

determining the reliability by use of the detection information, in response to the request.