JP2007310590A - Radio tag system, radio tag data writing method, radio tag reader/writer device and radio tag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio tag system without destroying existing data when rewriting the data of a radio tag, and to provide a radio tag data writing method, a radio tag reader/writer device and a radio tag. <P>SOLUTION: From two data storage regions in which sequence data showing the sequence of writing the data of a radio tag and information data showing predetermined information are stored in association with each other, the sequence data and the information data are read by a radio tag reader/writer device (ST101), and the read sequence data and information data are stored (ST102), and the valid data storage region is decided based on the stored sequence data (ST103 to ST105), and new information data acquired by operating processing to the information data read and stored from the data storage region decided to be valid and sequence data showing the updated sequence are written in the data storage region other than the data storage region decided to be valid (ST107). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a wireless tag system, a wireless tag data writing method, a wireless tag reader / writer device, and a wireless tag that read data stored in a wireless tag, process the read data, and write the data.

  An RFID tag system is known in which predetermined data is wirelessly written to a wireless tag (hereinafter referred to as an RFID (Radio Frequency Identification) tag) and data written in the RFID tag is read by an RFID tag reader. ing.

In addition, a plurality of redundant blocks associated with a plurality of data blocks are retrieved from the recording medium, the number of blocks having errors from the plurality of blocks retrieved from the recording medium is determined, and the number of blocks having errors is the redundant block. When the number of data blocks exceeds the above, it is known that the data block is subjected to error correction in the data segment (see Patent Document 1).
JP 2005-135572 A

  An RFID tag is activated by receiving magnetic force or radio waves output from an antenna connected to a reader / writer device, and data in the memory is read and written. The RFID tag is output from the antenna during the reading and writing process. When moving outside the range of the radio wave to be transmitted, in addition to the situation that “writing could not be performed”, a situation that “data in the middle of writing exists in the RFID tag” occurs. Thus, when writing to the RFID tag fails, existing data in the RFID may be destroyed.

  In other words, when an RFID tag is used for a card that is used for the purpose of updating data to new data calculated based on existing data every time it is used, such as a point card or a prepaid card, it is written If it fails, the existing data will be destroyed, and the data indicating the points and prepaid balance amount accumulated so far will be lost.

  The present invention has been made in view of the above circumstances, and its purpose is a card used for the purpose of updating data to new data calculated based on existing data every time it is used. The present invention provides a wireless tag system, a wireless tag data writing method, a wireless tag reader / writer device, and a wireless tag that do not destroy existing data when an RFID tag is used.

  The present invention relates to a wireless tag system including a wireless tag having a storage area for storing data and a wireless tag reader / writer device that reads data stored in the wireless tag and writes data to the wireless tag. Two data storage areas for storing the order data indicating the order of writing and information data indicating predetermined information in association with each other, and reading the order data and information data of the two data storage areas in the storage area, The read order data and information data are stored, a valid data storage area is determined based on the stored order data, and the data storage determined to be valid is stored in a data storage area that is not valid. New information data that has been processed from the information data read from the area and stored in the storage means and updated It is intended to write the order data indicating the ordinal.

  According to the present invention, when an RFID tag is used for a card used for the purpose of updating data to new data calculated based on existing data every time it is used, the existing data is destroyed. Wireless tag system, wireless tag data writing method, wireless tag reader / writer device, and wireless tag can be provided.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram for explaining a configuration of a wireless tag (RFID tag) system in this embodiment. As shown in FIG. 1, to write data to or read data from a control device 1 that is a terminal device such as a PC (personal computer) or POS (point of sales) and an RFID tag 3 embedded in a prepaid card 4 Are connected so that they can communicate with each other. Further, the reader / writer device 2 has an antenna 2a, outputs a radio wave indicating a predetermined command from the antenna 2a, and receives a radio wave output from the RFID tag 3 in response to the radio wave.

  FIG. 2 is a block diagram showing a configuration of the reader / writer device 2. The reader / writer device 2 includes an interface unit 21 with the control device 1, a control unit 22 including a CPU, a ROM, a RAM having a buffer for storing information, and a transmission / reception unit 23 that controls transmission / reception of data to / from the RFID tag 3. And a display control unit 25 for controlling display on the display unit 24.

  FIG. 3 is a block diagram showing the configuration of the RFID tag 3. The RFID tag 3 includes a tag antenna 3a made of a loop coil or the like and an LSI chip 3b. The LSI chip 3b includes a power generation unit 31, a demodulation unit 32, a modulation unit 33, a control unit 34, and a storage unit 35. The power generation unit 31 supplies power to each unit by rectifying and stabilizing the modulated radio wave received by the tag antenna 3a. The demodulator 32 demodulates the modulated radio wave and sends it to the controller 34. The modulation unit 33 modulates the information sent from the control unit 34 and sends it to the tag antenna 21. When the information demodulated by the demodulation unit 32 is a predetermined read command, the control unit 34 reads out the information stored in the storage unit 35 and sends it to the modulation unit 33. When the information is a predetermined write command, the control unit 34 receives the received information. Write to a predetermined area of the storage unit 35. The storage unit 35 stores various data.

  FIG. 4 is a diagram for explaining a storage area of the storage unit 35 of the RFID tag 3. The writing of data to the RFID tag 3 by the reader / writer device 2 is performed every certain unit, and this unit is referred to as a block. As shown in FIG. 4, the storage unit 35 includes a user ID area 35a and a user area 35b. The user ID area 35a is an area composed of one block for storing an identification number unique to the RFID tag 3. The user area 35b is an area composed of a plurality of blocks for storing data written by the reader / writer device 2 by the user. This user area can be rewritten.

  The user area has a plurality of blocks (data storage areas) such as a block B1, a block B2, a block B3,. Each of the blocks B1, B2, B3,... Has a sequential number (S / N) and a checksum value (CS). In each of the blocks B1, B2, B3,..., S / N as the order data, the data written at the S / N times and the checksum value (CS) of the S / N + data are stored as information data. .

  FIG. 5 is a diagram for explaining the RFID tag 3 having the data areas of the block B1 and the block B2 as the user ID area 35a and the user area 35b. As shown in FIG. 5, each block B1 and B2 has a total size of 8 bytes, where the S / N size and the checksum value size are 1 byte and the data size is 6 bytes. At the first time (when the RFID tag is issued), the S / N of the block B1 is “1”, and the S / N of the block B2 is “0”.

  Hereinafter, a case where the RFID tag 3 having the data areas of the user ID area 35a and the user area 35b (block B1 and block B2) shown in FIG. 5 is embedded in the prepaid card 4 will be described. That is, the data indicating the prepaid balance amount in the data format shown in FIG. 5 is held, and the balance is updated by the reader / writer device 2 at the time of settlement (the balance amount data is read and the new balance amount data after the settlement processing is obtained. The case of rewriting) will be described.

  First, the case where the prepaid card 4 in which the balance amount of 1000 yen is stored is issued will be described. Using the reader / writer device 2, the balance amount data of 1000 yen is written and issued to the RFID tag 3 in which data other than the user ID area 35a is blank (all data is “0”). First, the user ID, the data of the block B1 and the block B2 are read, and the S / N of each block is compared. In this case, since S / N is both “0”, the block B1 is set as a data write target. That is, if the S / N is the same, the block with the young block number is set as the data write target area. When S / N is “valid MAX” and “1”, a block having S / N of “1” is a data write target.

  Then, the reader / writer device 2 designates the user ID, and S / N = 01 (Hex), Data = 00 00 00 00 03 E8 (Hex), CS = CSUM (01 00 00 00 00 03 E8). Write to the block B1 of the RFID tag 3. Even if this data writing fails, the S / N of the block B2 which is the pair of the block B1 remains “0”, so when the writing is retried, the block B1 becomes the writing target again. When the prepaid card 4 is issued, this operation is repeated until data writing is successful. The RFID tag 3 in which data writing is not successful no matter how many times it is retried is discarded as being physically damaged.

  FIG. 6 is a diagram showing the RFID tag storage unit 35 in which the balance amount data of 1000 yen is written in this manner. As shown in FIG. 6, the block B1 stores S / N “1”, data indicating the balance amount of 1000 yen, CS of S / N and 1000 yen data, and the block B2 is blank. Yes.

  FIG. 7 is a flowchart showing a main part of a process of reading data from the RFID tag 3 embedded in the prepaid card 4 and writing the data to the RFID tag 3 executed by the control unit 22 of the reader / writer device 2.

  First, the data stored in the user ID area 35a, the block B1, and the block B2 of the RFID tag 3 are read (ST101, reading means). The data read from the user ID area 35a, the block B1, and the block B2 is temporarily stored in a buffer that stores information in the RAM in the control unit 22 (ST102, storage unit).

  Then, based on the data stored in the RAM, the S / N of the block B1 and the S / N of the block B2 are compared, and it is determined whether or not the checksum of the block having a large S / N is OK (ST103, Check means). Whether or not the checksum is OK is determined by comparing the S / N of the read block B1 with the checksum calculated from the data and the checksum value read from the RFID tag 3.

  If it is determined that the checksum is OK (YES in ST103), a block having a large S / N, that is, block B1 is validated (ST104). If it is determined that the checksum is not OK (NO in ST103), a block having a small S / N, that is, block B2 is validated (ST105). Steps ST104 and ST105 constitute valid data storage area determination means. In addition, a determination unit is configured in steps ST103 to ST105.

  New data is calculated based on the data of the block thus determined to be valid (ST106). The new data is, for example, new balance amount data obtained by subtracting the amount used this time from balance amount data read from a block determined to be valid, and updated S / N. The updated S / N is a value obtained by adding 1 to a large S / N number stored in the control unit 22 (when the S / N value is MAX, it is “0”). ), That is, when “0” and “1” are stored as S / N, a value obtained by adding 1 to a large number, that is, “2” is obtained. Then, the calculated new data is written into a block that has not been determined to be valid in the process of step ST104 or ST105 (ST107, writing means). This writing is performed by designating the user ID read from the RFID tag 3.

  Next, it is determined whether or not a response indicating that new data has been written is received from the RFID tag 3 (ST108). If it is determined in step ST108 that the response data from the RFID tag 3 is a new data write error, the process returns to step ST107 and new data is written again. If it is determined in step ST108 that the response data from the RFID tag 3 is OK to write new data, a success message indicating that the new data has been successfully written is displayed on the display unit 24 (ST109). Further, if there is no response from the RFID tag 3 in the process of step ST108, that is, if the RFID tag 3 has not been detected, it is determined whether or not the RFID tag 3 has not been detected when a new data write is retried. (ST110). That is, it is determined whether data is not detected after data is written to the RFID tag 3 or whether the RFID tag 3 cannot be detected from the beginning.

  If it is determined in step ST110 that the RFID tag 3 has not been detected at the time of the retry, the written data may be damaged, so a write failure error message indicating a failure to write new data is displayed. It is displayed on the part 24 (ST111).

  If it is determined in step ST110 that the RFID tag 3 is not detected at the time of retry, that is, if the RFID tag 3 cannot be detected from the beginning, an RFID tag non-detection error message indicating that the RFID tag 3 is not detected is displayed. It is displayed on the display unit 24 (ST112).

  Next, a description will be given of the operation in the case of making a payment for shopping for 400 yen using the prepaid card 4 in which the balance amount data of 1000 yen shown in FIG. 6 is stored.

  When the reader / writer device 2 reads the user ID and the data of the block B1 and the block B2 from the RFID tag 3 embedded in the prepaid card 4, the S / N of each block is compared. Since the S / N of the block B1 is “1” and the S / N of the block B2 is “0”, it is determined that the S / N of the block B1> the S / N of the block B2, and the block B1 having a large S / N is checked. It is determined whether or not the thumb is OK.

  If it is determined that the checksum of the block B1 is OK, the amount data of 1000 yen of the block B1 becomes valid. Among the new data, the amount data is 600 yen obtained by subtracting 400 yen from 1000 yen, the S / N is “2”, the CS of these data is calculated, and the calculated data indicates that the RFID tag 3 is valid. It is written in the block B2 that has not been determined.

  FIG. 8 is a diagram showing the storage unit 35 of the RFID tag 3 in which data is written in this way. Although the data of the block B1 is not changed from that described with reference to FIG. 6, the S / N is updated from “0” to “2” and the amount data indicating 600 yen is written in the block B2. Data CS is written. That is, the amount data indicating 1000 yen as the previous balance amount and the data indicating 600 yen as the current balance amount are both stored in the RFID tag 3.

  Next, a case where a purchase of 100 yen is further made using the prepaid card 4 having a balance amount of 600 yen will be described. When the reader / writer device 2 reads the user ID and the data of the block B1 and the block B2 from the RFID tag 3 embedded in the prepaid card 4, the S / N of each block is compared. Since the S / N of the block B1 is “1” and the S / N of the block B2 is “2”, it is determined that the S / N of the block B1 <the S / N of the block B2, and the block B2 having a large S / N is checked. It is determined whether or not the thumb is OK.

  If it is determined that the checksum of block B2 is OK, the amount data of 600 yen in block B2 becomes valid. Among the new data, the amount data is 500 yen obtained by subtracting 100 yen from 600 yen, the S / N is “3”, the CS of these data is calculated, and the calculated data indicates that the RFID tag 3 is valid. It is written in the block B1 that has not been determined.

  FIG. 9 is a diagram showing the storage unit 35 of the RFID tag 3 in which data is written in this way. The data in block B2 has not changed from the case described with reference to FIG. 8, but in block B1, the S / N is updated from “1” to “3” and monetary data indicating 500 yen is written. CS of this data is written. That is, both the amount data indicating the previous balance amount of 600 yen and the data indicating the current balance amount of 500 yen are both stored in the RFID tag 3.

  Next, a case where a purchase of 400 yen is further made using the prepaid card 4 having a balance amount of 500 yen will be described. When the reader / writer device 2 reads the user ID and the data of the block B1 and the block B2 from the prepaid card 4, the S / N of each block is compared. Since the S / N of the block B1 is “3” and the S / N of the block B2 is “2”, it is determined that the S / N of the block B1> the S / N of the block B2, and the block B1 having a large S / N is checked. It is determined whether or not the thumb is OK.

  If it is determined that the checksum of the block B1 is OK, the amount data of 500 yen of the block B1 becomes valid. Among the new data, the amount data is 100 yen obtained by subtracting 400 yen from 500 yen, the S / N is “4”, the CS of these data is calculated, and the calculated data indicates that the RFID tag 3 is valid. It is written in the block B2 that has not been determined.

  FIG. 10 is a diagram showing the storage unit 35 of the RFID tag 3 in which data is written in this way. Although the data in block B1 has not changed from that described with reference to FIG. 9, S / N is updated from “2” to “4” in block B2, and money amount data indicating 100 yen is written. CS of this data is written. That is, the amount data indicating 500 yen as the previous balance amount and the data indicating 100 yen as the current balance amount are both stored in the RFID tag 3.

  In this way, each time the prepaid card 4 is used for payment, the data of the two blocks B1 and B2 are read from the RFID tag 3 together with the user ID, and the amount of money used this time is subtracted from the amount of money of the valid block. And the updated S / N and CS of these data are written in a block which is not determined to be valid. For this reason, the previous data can be left and existing data is not destroyed.

  Further, when the prepaid card 4 is writing new data, the data writing has failed because the prepaid card 4 is moved out of the radio wave range emitted from the antenna 2a of the reader / writer device 2. A case will be described in which the failure occurs when the state transitions from the state shown in FIG. 8 to the state shown in FIG. 9 (when 100 yen is used when the balance amount is 600 yen).

  FIG. 11 is a diagram illustrating the storage unit 35 of the RFID tag 3 in which data writing has failed. Although the data in the block B2 is not changed from that described with reference to FIG. 8, since the data writing in the block B1 has failed, the S / N is updated from “3” to the destroyed data “12” and is valid. The amount data is not a balance, and the CS is destroyed. That is, the data stored in the block B1 in the RFID tag 3 is destroyed. If the data writing has failed, a writing failure error message indicating a new data writing failure is displayed on the display unit 24 of the reader / writer device 2.

  When the operator of the reader / writer device 2 visually recognizes the display on the display unit 24, the operator performs a settlement process of 100 yen using the prepaid card 4 again. That is, the prepaid card 4 is placed again in the range where radio waves are emitted from the antenna 2a of the reader / writer device 2, and the user ID, the data of the block B1 and the block B2 are read from the RFID tag 3 embedded in the prepaid card 4. Then, the S / N of each block is compared. Since the S / N of the block B1 is “12” and the S / N of the block B2 is “2”, it is determined that the S / N of the block B1> the S / N of the block B2, and the block B1 having a large S / N is checked. It is determined whether or not the thumb is OK.

  Since the data writing has failed and the data has been destroyed, it is determined that the checksum of the block B1 is not OK. Therefore, the amount data of 600 yen in block B2 is valid. Of the new data, the amount data is 500 yen obtained by subtracting 100 yen from 600 yen, and the S / N is calculated as “3”, and the calculated data is not determined to be valid for the RFID tag 3 Block B1 Is written to. The data written in this way is the same as the data storage area shown in FIG.

  Therefore, even if data writing to a block that is not determined to be valid fails, the data that failed to be written at the time of reading is not valid because the checksum is determined to be incorrect, and the previous balance It is determined that the block storing the data indicating the amount of money and the S / N is valid. For this reason, even if data writing fails, the data of the existing balance amount of the prepaid card 4 is not destroyed.

  In the above-described embodiment, numerical values are used as S / N, but the present invention is not limited to this. For example, a timer may be provided in the control unit 22 of the reader / writer device 2 and the current time measured by the timer may be written when writing. Then, when data is read from the RFID tag 3, the time may be compared to determine a valid block.

  Note that the present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying constituent elements without departing from the scope of the invention in the implementation stage.

1 is a diagram schematically showing an overall configuration of a wireless tag system in an embodiment of the present invention. FIG. 2 is a block diagram showing a main configuration of the wireless tag reader / writer device in the embodiment. FIG. 3 is a block diagram showing a main configuration of the wireless tag in the embodiment. 4 is a diagram for illustrating a configuration of a storage unit of the wireless tag in the embodiment. FIG. 2 is a diagram showing a configuration of a storage unit of a wireless tag in the embodiment. FIG. 4 is a diagram showing an example of data stored in the storage unit of the wireless tag in the embodiment. FIG. 6 is a flowchart showing a main part of a process for writing data in a storage unit of the wireless tag in the embodiment. 4 is a diagram showing an example of data stored in the storage unit of the wireless tag in the embodiment. FIG. 4 is a diagram showing an example of data stored in the storage unit of the wireless tag in the embodiment. FIG. 4 is a diagram showing an example of data stored in the storage unit of the wireless tag in the embodiment. FIG. 4 is a diagram showing an example of data stored in the storage unit of the wireless tag in the embodiment. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Control apparatus, 2 ... Reader / writer apparatus, 2a ... Antenna, 3 ... RFID tag, 4 ... Prepaid card, 22 ... Control part, 24 ... Display part, 35 ... Memory | storage part, 35a ... User ID area, 35b ... User area , B1, B2 ... Block

Claims (5)

In a wireless tag system comprising a wireless tag having a storage area for storing data, and a wireless tag reader / writer device that reads data stored in the wireless tag and writes data to the wireless tag,
The storage area has two data storage areas for storing the order data indicating the order in which the data is written and the information data indicating the predetermined information in association with each other,
Reading means for reading out the order data and information data of the two data storage areas in the storage area;
Storage means for storing the order data and information data read by the reading means;
Determination means for determining an effective data storage area based on the order data stored in the storage means;
New information data obtained by processing the information data read from the data storage area determined to be valid and stored in the storage means in a data storage area that is not valid by the determination means; A wireless tag system comprising: writing means for writing order data indicating the updated order.   The determination means checks whether or not the data content of the data storage area determined to be valid based on the sequence data is correct, and when the data content of the data storage area is correct by the check by the check means An effective data storage area in which the data storage area is valid, and when the data content of the data storage area is not correct in the check by the checking means, the data storage area that is not determined as valid is valid The wireless tag system according to claim 1, further comprising a determination unit. In a wireless tag data writing method of reading data stored in a wireless tag having a storage area for storing data with a wireless tag reader / writer device, and writing data to the wireless tag with a wireless tag reader / writer device,
The wireless tag reader / writer device stores the order data and the information data from the two data storage areas of the wireless tag that store the correspondence data indicating the order in which the data is written and the information data indicating the predetermined information. A reading step;
Storing the order data and information data read in this step;
Determining a valid data storage area based on the sequence data stored in this step;
In the data storage area that is not determined to be valid in this step, new information data obtained by processing the information data read out and stored from the data storage area determined to be valid and the updated order And a step of writing the order data to be shown. In a wireless tag reader / writer device that reads data stored in a wireless tag having a storage area for storing data and writes data to the wireless tag,
Reading means for reading the order data and the information data from the two data storage areas of the wireless tag for storing the order data indicating the order in which the data is written and the information data indicating the predetermined information, in association with each other;
Storage means for storing the order data and information data read by the reading means;
Determination means for determining an effective data storage area based on the order data stored in the storage means;
New information data obtained by processing the information data read from the data storage area determined to be valid and stored in the storage means in a data storage area that is not valid by the determination means; A wireless tag reader / writer device comprising writing means for writing order data indicating the updated order. In a wireless tag in which data stored in a wireless tag reader / writer device is read and written,
There are two data storage areas for storing the order data indicating the order in which the data is written and the information data indicating the predetermined information in association with each other,
The wireless tag reader / writer device reads out the order data and the information data from the data storage area, and stores the valid data in a data storage area other than the data storage area determined to be valid from the read order data. A wireless tag in which new information data obtained by processing information data read from a data storage area determined to be processed and order data indicating an updated order are written.

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