Method of generating activation code for radio frequency identification tag

• US 8,519,827 B2
• Filed: 10/15/2008
• Issued: 08/27/2013
• Est. Priority Date: 12/17/2007
• Status: Expired due to Fees

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Kim, Hyunseok, Choi, Su Na, Lee, Heyung Sub, Seong, Nak Seon, Pyo, Cheol Sig, Chae, Jong-Suk
• Primary Examiner(s): HOLLOWAY III, EDWIN C
• Application Number:
  US12/251,890
• Publication Number:
  US 20090153329A1
• Time in Patent Office: 1,777 Days
• Field of Search: 340/10.1, 340/10.3, 340/10.31, 340/10.32, 340/10.51, 340/10.52, 340/572.1
• US Class Current: 340/10.32
• 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 7/10108 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
• CPC Class Codes: G06K 7/10297 arrangements for handling protocols designed for non-contact record carriers such as RFIDs NFCs, e.g. ISO/IEC 14443 and 18092 cryptographic protocols H04L9/00; network security protocols H04L63/00; real-time communication protocols in data switching networks H04L65/00; network protocols for data switching network services H04L67/00
• CPC Class Codes: G08B 13/2417 having a radio frequency identification chip

Abstract

Disclosed is a method of generating an activation code of a Radio Frequency Identification (RFID) tag including calculating K satisfying a condition that N is set to exceed 2^k-1 and to be equal to or less than 2^k, when classifying N number of objects through a plurality of RFID tags; and classifying the N number of objects by recording a code corresponding to each of the N number of objects in a K-bit region in an activation code of each RFID tag.

Claims

1. A method of generating an activation code (AC) of a Radio Frequency Identification (RFID) tag, the method comprising:

calculating a K satisfying a condition that N is set to exceed 2^K-1 and to be equal to or less than 2^K, when classifying N number of objects through a plurality of RFID tags, wherein K is greater than or equal to 2; and

classifying each object in the N number of objects by;

assigning a classification and a sub-classification to the object;

generating a code for the object, such that the code comprises K bits, and such that a first portion of the code corresponds to the classification of the object and a second portion of the code corresponds to the sub-classification of the object, wherein the first portion of the code comprises X bits wherein the first and second portions of the code to ether comprise Y bits, and wherein Y is less than or equal to K; and

recording, using a processing device, the code for the object in an RFID tag corresponding to the object, such that the code is recorded in an AC of the RFID tag,

wherein, in response to receiving a first activation mask comprising X bits, the RFID tag is configured to activate when the X bits of the first activation mask match the X bits of the first portion of the code recorded in the AC of the RFID tag, and

wherein, in response to receiving a second activation mask comprising Y bits, the RFID tag is configured to activate when the Y bits of the second activation mask match the Y bits of the first and second portions of the code recorded in the AC of the RFID tag.

2. The method of claim 1, wherein the length of each activation code is between two bits and 96 bits.

3. The method of claim 1, wherein each of the codes is embodied as a K-bit binary number code.

4. The method of claim 1, further comprising:

for a first object in the N number of objects, recording the code for the first object in an activation mask included in an activation command of an RFID reader.

5. The method of claim 1, wherein at least one of the RFID tags is a tag with a battery.

6. The method of claim 1, wherein the N number of objects comprises a first object and a second object, wherein the classification of the first object is different than the classification of the second object,

wherein the plurality of RFID tags comprises a first RFID tag and a second RFID tag, wherein the first RFID tag corresponds to the first object and the second RFID tag corresponds to the second object, and

wherein the first portion of the code for the first object is different than the first portion of the code for the second object.

7. The method of claim 6, wherein the sub-classification of the first object is different than the sub-classification of the second object, and wherein the second portion of the code for the first object is different than the second portion of the code for the second object.

8. The method of claim 1, wherein the plurality of RFID tags comprises a first RFID tag and a second RFID tag, and wherein the activation code for the first RFID tag is different than the activation code for the second RFID tag.

9. The method of claim 1, wherein the plurality of RFID tags comprises a first RFID tag, and wherein the length of the activation code for the first RFID tag is greater than K bits.

10. The method of claim 1, further comprising:

for a first object in the N number of objects, recording the one or more bits of the code corresponding to the classification of the first object, but not the one or more bits of the code corresponding to the sub-classification of the first object, in an activation mask included in an activation command of an RFID reader.

11. The method of claim 1, further comprising:

for a first RFID tag in the plurality of RFID tags, recording the activation code for the first RFID tag in an activation mask included in an activation command of an RFID reader.