Method of recognizing whether a trasponder belongs to a group of transponders

• US 20060077043A1
• Filed: 10/31/2003
• Published: 04/13/2006
• Est. Priority Date: 11/21/2002
• Status: Active Grant

• Current Assignee: NXP B.V. (NXP Semiconductors NV)
• Original Assignee: Koninklijke Philips N.V.
• Inventors: Scherabon, Christian, Cernusca, Michael, Amtmann, Franz
• Granted Patent: US 7,737,822 B2
• Time in Patent Office: Days
• US Class Current: 340/10.320
• CPC Class Codes: G06K 19/0723 the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
• 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 7/10039 interrogator driven, i.e. synchronous
• 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

Using a method of recognizing whether a transponder (2) designed for communicating with a communication station (1) belongs to one of at least two groups (GR1, GR2, GR3, GRn) of transponders (2), firstly, for each group (GR1, GR2, GR3, GRn) of transponders (2), a check data block (CRC1, CRC2, CRC3, CRCn) that is significant for the group (GR1, GR2, GR3, GRn) of transponders (2) is generated, and, secondly, the data from the check data block (CRC1, CRC2, CRC3, CRCn) that is significant for the group (GR1, GR2, GR3, GRn) of transponders (2) is evaluated for the recognition of whether the transponder (2) belongs to a group (GR1, GR2, GR3, GRn) of transponders (2).

Claims

1. A method of recognizing whether a transponder designed for communicating with a communication station belongs to one of at least two groups of transponders under which method the communication station designed for communicating with the transponder delivers a request signal to the transponder, which request signal comprises a command data block and a check data block, and under which method, data contained in the request signal is evaluated in the transponder in order to recognize whether the transponder belongs to a group of transponders,

wherein, for each group of transponders, a check data block that is significant for the group of transponders is generated, and wherein the data that is evaluated for the recognition of whether the transponder belongs to a group of transponders is data from the check data block that is significant for the group of transponders.

2. A method as claimed in claim 1, wherein a CRC data block that is significant for the group of transponders is selected as the check data block that is significant for the group of transponders.

3. A communication station for communicating with a transponder, which transponder belongs to one of at least two groups of transponders, wherein the communication station contains means for implementing the method as claimed in claim 1.

4. A communication station as claimed in claim 3, wherein check-data-block generation means is provided and wherein the check-data-block generation means takes the form of CRC-data- block generation means, which CRC-data-block generation means (interacts with start-value memory means which is provided to store a start value which start value is provided in order to influence the generation of the CRC data block in the CRC-data-block generation means and wherein the start-value memory means is of programmable design and is designed for storing different start values, which different start values can be written to the start-value memory means and are responsible for the generation of different CRC data blocks, of which different CRC data blocks, each CRC data block is significant for a group of transponders

5. A circuit for a communication station for communicating with a transponder, which transponder belongs to one of at least two groups of transponders, wherein the circuit contains means for implementing the method as claimed in claim 1.

6. A circuit as claimed in claim 5, wherein check-data-block generation means is provided and wherein the check-data-block generation means takes the form of CRC-data-block generation means, which CRC-data-block generation means interacts with start-value memory means, which is provided to store a start value, which start value is provided in order to influence the generation of-the CRC data block in the CRC-data-block generation means, and wherein the start-value memory means is of programmable design and is designed for storing different start values, which different start values can be written to the start-value memory means and are responsible for the generation of different CRC data blocks, of which different CRC data blocks, each CRC data block is significant for a group of transponders.

7. A transponder for communicating with communication station, which transponder belongs to one of at least two groups of transponders, wherein the transponder contains means for implementing the method as claimed in claim 1.

8. A transponder as claimed in claim 7, wherein check-data-block generation means is provided and wherein the check-data-block generation means takes the form of CRC-data-block generation means, which CRC-data-block generation means interacts with start-value memory means), which is provided to store a start value, which start value is provided in order to influence the generation of the CRC data block in the CRC-data-block generation means, and wherein the start-value memory means is of programmable design and is designed for storing different start values, which different start values can be written to the start-value memory means and are responsible for the generation of different CRC data blocks, of which different CRC data blocks, each CRC data block is significant for a group of transponders.

9. A transponder as claimed in claim 8, wherein the start-value memory means is designed to store at least two different start values, and wherein means for sending one start value selected from the at least two start values to the CRC-data-block generation means are provided.

10. A circuit for a transponder for communicating with a communication station, which transponder belongs to one of at least two groups of transponders, wherein the circuit contains means for implementing the method as claimed in claim 1.

11. A circuit as claimed in claim 10, wherein check-data-block generation means is provided and wherein the check-data-block generation means takes the form of CRC-data-block generation means, which CRC-data-block generation means interacts with start-value memory means, which is provided to store a start value which start value is provided in order to influence the generation of the CRC data block in the CRC-data-block generation means, and wherein the start-value memory means is of programmable design and is designed for storing different start values , which different start values can be written to the start-value memory means and are responsible for the generation of different CRC data blocks, of which different CRC data blocks each CRC data block is significant for a group of transponders.

12. A circuit as claimed in claim 11, wherein the start-value memory means is designed to store at least two different start values, and wherein means for sending one start value selected from the at least two start values to the CRC-data-block generation means are provided.