IC tag, method of controlling the IC tag, and IC tag system

• US 20070069863A1
• Filed: 09/26/2006
• Published: 03/29/2007
• Est. Priority Date: 09/27/2005
• Status: Active Grant

• Current Assignee: Renesas Electronics Corporation
• Original Assignee: NEC Electronics Corporation (Renesas Electronics Corporation)
• Inventors: Akiyama, Kazuhiro, Uchino, Tatsuya, Seki, Kazumi, Okamoto, Seiichi, Igarashi, Hatsuhide, Miyashita, Toshiyuki
• Granted Patent: US 8,174,365 B2
• Time in Patent Office: Days
• US Class Current: 340/10.200
• CPC Class Codes: H04B 5/0056 for use in interrogation, identification or read/write systems record carriers G06K7/00, G06K19/00; for railways B61L3/12
• CPC Class Codes: H04B 5/0062 in RFID [Radio Frequency Identification] Systems
• CPC Class Codes: H04B 5/77 for interrogation

Abstract

To provide an IC tag, a method of controlling the IC tag, and an IC tag system which can reduce a communication sequence between the reader/writer and the IC tag and can shorten a communication period or a period necessary for executing the command. According to an embodiment of the invention, an IC tag that executes a command processing based on a command received from a redder/writer, includes: a command analyzing unit determining an execution condition of the command received from the redder/writer; and a command execution unit executing a first command processing if the execution condition is met, and executing a second command processing different from the first command processing if the execution condition is not met.

Claims

1. An IC tag that executes a command processing based on a received command, comprising:

an execution condition determination unit determining an execution condition of the received command; and

a command execution unit executing a first command processing if the execution condition is met, and executing a second command processing different from the first command processing if the execution condition is not met.

2. The IC tag according to claim 1, further comprising:

a state flag representing a communication state of the IC tag,

wherein the execution condition determination unit determines the execution condition based on the state flag.

3. The IC tag according to claim 1, further comprising:

a storage circuit storing a tag ID as identification information unique to the IC tag,

wherein the execution condition determination unit determines the execution condition based on the tag ID.

4. The IC tag according to claim 1, wherein the IC tag executes communications while shifting a communication state,

the execution condition is a condition matched/mismatched with a communication state of the IC tag, and

the command execution unit executes the first command processing if a current communication state of the IC tag matches the execution condition of the received command, and executes the second command processing if the current communication state of the IC tag does not match the execution condition of the received command.

5. The IC tag according to claim 1, wherein the execution condition is a condition matched/mismatched with a tag ID as identification information unique to the IC tag, and

the command execution unit executes the first command processing if the tag ID of the IC tag matches a tag ID of the received command, and executes the second command processing if the tag ID of the IC tag does not match the tag ID of the received command.

6. The IC tag according to claim 1, wherein one of the first command processing and the second command processing is a processing not sending data to the outside of the IC tag.

7. The IC tag according to claim 6, wherein the processing not sending data is a processing of shifting the communication state of the IC tag.

8. The IC tag according to claim 6, wherein the first command processing is a processing of sending data stored in the IC tag to the outside of the IC tag, and

the second command processing is a processing of shifting the communication state of the IC tag.

9. The IC tag according to claim 1, wherein the first command processing and the second command processing send data to the outside of the IC tag at different timings.

10. The IC tag according to claim 9, wherein the first command processing is a processing of sending data stored in the IC tag to the outside of the IC tag, and

the second command processing is a processing of storing data into the IC tag.

11. A method of controlling an IC tag for executing a command processing based on a received command, comprising:

determining an execution condition of the received command with the IC tag; and

executing a first command processing with the IC tag if the execution condition is met, and executing a second command processing different from the first command processing with the IC tag if the execution condition is not met.

12. The method of controlling an IC tag according to claim 11, wherein the IC tag includes a state flag representing a communication state of the IC tag, and

the execution condition is determined based on the state flag.

13. The method of controlling an IC tag according to claim 11, wherein the IC tag includes a storage circuit storing a tag ID as identification information unique to the IC tag, and

the execution condition is determined based on the tag ID.

14. The method of controlling an IC tag according to claim 11, wherein the IC tag executes communications while shifting a communication state,

the execution condition is a condition matched/mismatched with a communication state of the IC tag, and

the first command processing is executed if a current communication state of the IC tag matches the execution condition of the received command, and the second command processing is executed if the current communication state of the IC tag does not match the execution condition of the received command.

15. The method of controlling an IC tag according to claim 11, wherein the execution condition is a condition matched/mismatched with a tag ID as identification information unique to the IC tag, and

the first command processing is executed if the tag ID of the IC tag matches a tag ID of the received command, and the second command processing is executed if the tag ID of the IC tag does not match the tag ID of the received command.

16. The method of controlling an IC tag according to claim 11, wherein one of the first command processing and the second command processing is a processing not sending data to the outside of the IC tag.

17. The method of controlling an IC tag according to claim 16, wherein the processing not sending data is a processing of shifting the communication state of the IC tag.

18. The method of controlling an IC tag according to claim 16, wherein the first command processing is a processing of sending data stored in the IC tag to the outside of the IC tag, and

the second command processing is a processing of shifting the communication state of the IC tag.

19. The method of controlling an IC tag according to claim 16, wherein the first command processing is a processing of sending data stored in the IC tag to the outside of the IC tag, and

the second command processing is a processing of storing data into the IC tag.

20. An IC tag system, comprising:

a reader/writer; and

an IC tag executing a command processing based on a command received from the reader/writer,

the IC tag comprising;

an execution condition determination unit determining an execution condition of the command received from the reader/writer; and

a command execution unit executing a first command processing if the execution condition is met, and executing a second command processing different from the first command processing if the execution condition is not met.