JP2003308501A - Noncontact ic card and writing method for it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simply and rapidly check whether data are correct or not in reading the data without reducing a memory area, in a writing method for a noncontact IC card wherein noncontact type data communication is carried out between the noncontact IC card and a reader/writer. <P>SOLUTION: A memory for this noncontact IC card has a data area for storing data, and a control area for writing the same date before a renewal and after the renewal, and checks whether the control area before the renewal is the same as the control area after the renewal in reading the data. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-contact type IC card having a built-in memory, an IC tag, etc., and a wireless card (hereinafter, referred to as a wireless card) for reading / writing the internal memory.
Data to a non-contact IC card and a memory of the non-contact IC card when non-contact data communication is performed between the non-contact IC card) and a data transmitting / receiving device (hereinafter referred to as a reader / writer). Regarding writing method.

[0002]

2. Description of the Related Art Conventionally, non-contact type data communication between a non-contact IC card and a reader / writer has been widely used. For example, in an entrance / exit management system, a non-contact IC
The person who carries the card brings the IC card closer to the reader / writer set at the gate or the like, and wireless data communication is performed between the reader / writer and the IC card to authenticate the entering / leaving person. There is.

In such a data communication device, an IC
Each of the card and the reader / writer has a CPU, a semiconductor memory, etc., and mutually receives data transmitted from the other party and writes it in the memory, and transmits data read from the memory to the other party.

By the way, in the reader / writer used for writing the memory to the non-contact IC card,
The electromagnetic wave sent from the reader / writer is used for access to the non-contact IC card, and power supply to the non-contact IC card and data communication between the both are realized.

However, the following problems occur when writing data to the memory of the non-contact IC card. That is, while data is being written from the reader / writer to the non-contact IC card, for example, the distance between the non-contact IC card and the reader / writer is too large to get out of the communication range, so that power is supplied to the non-contact IC card. May also stop and the data being written may be corrupted.

In order to prevent such a situation, conventionally,
As shown in FIG. 3, the data area (file) of the memory of the non-contact IC card is divided into two, for example, file A
And a file B, a management area is further provided, and information such as a currently available data area (that is, information as to whether the currently available data area is the file A or the file B) is always written in the management area. I am trying. And
At the time of the next writing, the old data area (for example, the file A) is written. When the writing to the file A is normal, the data area (for example, the file B) written in the management information after the normal writing is updated as available.

In the method proposed in Japanese Patent Laid-Open No. 2000-99656, first and second data areas for storing data are set in the memory, and input is performed each time data is rewritten. The created data is alternately overwritten on the first data area and the second data area. As a result, the input data is alternately overwritten in the first and second data areas set in the memory each time the data is rewritten in the memory. Therefore, even if an abnormal situation such as power shutdown occurs when rewriting the data in the memory, it is possible to secure normal data in the memory, and use the data in the memory when recovering from the abnormal state. And normal processing can be performed.

However, these conventional non-contact ICs
According to the method of writing data to the memory of the card, two areas for storing the same data are required on the memory side of the non-contact IC card, and the memory area that can be effectively used on the card side becomes about half. Therefore, there is a problem that a sufficient data capacity cannot be secured.

Further, according to the data writing method for the memory of the conventional non-contact IC card as described above, in order to overwrite the data inputted in each data area,
There is a problem that extra time is required for writing data, which hinders rapid processing.

[0010]

When non-contact type data communication is performed between the non-contact type IC card and the reader / writer, the non-contact type IC card is kept out of the communication range with respect to the data transmitting / receiving device. Is impossible. If the power supply to the IC card is cut off due to the out-of-communication range and the update data is damaged, it may be possible to recover it by protocol control. The most accurate thing to check at the time of reading.

In view of such a point, in the present invention, it is always necessary to check whether or not the data is correct when reading. If this check results in an error, the previously updated content (write error data) is acquired from the host computer and recovery is performed.

As the checking method, a management area to be written at the time of updating and after the updating is prepared in the non-contact IC card, and the same data is written to these areas. At the time of reading data, by checking whether the data in the two areas are the same, it is possible to determine whether the previous writing was normal.

[0013]

To achieve the above object, according to the present invention, data is stored in a non-contact IC card in which data communication is performed with a reader / writer in a non-contact state. Provided is a non-contact IC card including a memory having a data area and a management area for writing the same data before and after updating.

Further, according to the present invention, in the writing method to the non-contact IC card in which the non-contact data communication is performed between the non-contact IC card and the reader / writer,
The IC card has a data area in which data is stored,
It is characterized by comprising a memory having a management area for writing the same data before and after updating, and at the time of reading data, it is checked whether or not the management area before updating and the management area after updating are the same. A non-contact IC card writing method is provided.

Furthermore, according to the present invention, in a writing method to a non-contact IC card in which data communication is performed in a non-contact manner between the non-contact IC card and the reader / writer, the IC card stores data. A memory area having a data area for writing the same data before and after updating, and at the time of writing the data,
The same data is written in the order of the management area before update, the data area, and the management area after update, and when reading the data, it is checked whether the management area before update and the management area after update are the same. Non-contact I characterized by performing
A writing method for a C card is provided.

In this case, when the management area before the update and the management area after the update are the same, it is judged that the writing to the data area of the memory was normal, and when they are not the same, the data area of the memory is written. It is judged that the writing has been abnormal, and the recovery processing of the data area of the memory is performed. After the check is completed, the data in the management area before update and the management area after update are erased each time.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a diagram for explaining one embodiment of a writing method for a contactless IC card according to the present invention. FIG. 2 shows the data format of the memory of the contactless card according to the present invention. As shown in the figure, in the present invention, the memory of the non-contact type IC card has a data area in which data is stored and a management area for writing data before (01) and after (01) after updating. .

That is, in FIG. 1, the writing at the time of updating the data is performed by first writing to the area (01) before updating set in the memory as the first step [1], and then the second step. In the step [2], writing to the valid data area in the memory is performed, and then in the third step [3], writing to the updated (01) area set in the memory is performed.

When the writing in the third stage is completed, the data written in the area (01) before updating as the first stage [1] and the updated ((3)] after being set in the memory ( It is checked whether the data written in the area 01) is the same.

If they are the same, it is judged that no abnormality has occurred on the way, and therefore it is presumed that the writing to the valid data area performed in the second step [2] was normal. However, if they are not the same, for example,
It is judged that the contactless IC card has gone out of communication range with the reader / writer and the power supply to the IC card has been cut off. Writing is invalid. Then, it is determined that such invalid data requires a treatment such as recovery.

As described above, according to the present invention, before updating (0
By checking whether the data written in the area 1) and the data written in the area (01) after the update are the same, whether or not the writing in the valid data area is normally performed. Can be judged. In this way, when it is determined that the writing to the valid data area has been normally performed, it is determined that no abnormality has occurred in the middle, and the area data before (01) and the area data after (01) are deleted. Prepare for the next data update.

On the other hand, if the data in the area before (01) and the data in the area after (01) are not the same and it is judged that the writing to the valid data area is invalid, At the time of starting the writing of the data, data communication is performed between the non-contact IC card and the reader / writer and the recovery process is performed prior to the data update.

As described above, according to the present invention, in addition to the data area in which the data is stored, the memory of the non-contact IC card is used for writing the data before (01) and after (01) after updating. Since only the management area is provided, the data area for checking can be made as small as possible with respect to the data area of the entire memory, and the effective data area can be widened accordingly. For example, in the RAM of the memory, it is sufficient to prepare a management area for writing data before (01) and after (01) updating about 8 or 16 bits, and the capacity of the entire memory area (4k, 8k, 16k bytes). It can be done in an extremely narrow area compared to (etc.). Therefore, in the present invention, as in the conventional example, the non-contact I
2 for storing the same data in the memory side of the C card
A sufficient effective data capacity can be secured without requiring one area.

Further, according to the present invention, by reading the data before (01) and the data after (01) after updating side by side, it is possible to reduce the number of accesses to the memory and shorten the reading time. Therefore, in the present invention,
Unlike the conventional example, it is not necessary to overwrite the data input to each of the two data areas, no extra time is required for writing the data, and quick processing can be achieved.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above embodiments, and various embodiments and modifications are possible within the spirit and scope of the present invention. , Can be modified.

[0027]

As described above, the noncontact I of the present invention is
According to the C card and the writing method for the C card, the data area of the non-contact IC card or the tag, which has a small memory area, can be effectively used, and the reliability of the data is improved.

[Brief description of drawings]

FIG. 1 is a diagram for explaining a check method in writing to a non-contact IC card of the present invention.

FIG. 2 is a diagram showing a data format of a non-contact IC card used in the present invention.

FIG. 3 is a diagram showing an example of a conventional method for writing to a non-contact IC card.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hirofumi Takeuchi             711 Toshida, Kurita character building, Nagano City, Nagano Prefecture             Shinko Electric Industry Co., Ltd. F-term (reference) 2C005 MA23 MB07 NA06 SA05 SA08                       SA22 SA26 TA22                 5B018 GA01 HA35 KA22 MA24 QA15                 5B035 AA00 BB09 CA11 CA23 CA29

Claims (5)

[Claims] 1. In a contactless IC card for performing data communication in a contactless manner with a reader / writer, a data area in which data is stored and a management area for writing the same data before and after updating are provided. A non-contact IC card comprising a memory having the same. 2. In a writing method to a non-contact IC card in which non-contact data communication is performed between the non-contact IC card and a reader / writer, the IC card has a data area in which data is stored and an update. It is characterized by comprising a memory having a management area for writing the same data before and after updating, and at the time of reading data, it is checked whether or not the management area before updating and the management area after updating are the same. Writing method to non-contact IC card. 3. In a writing method to a non-contact IC card in which non-contact data communication is performed between the non-contact IC card and a reader / writer, the IC card has a data area in which data is stored and an update. A memory having a management area for writing the same data before and after updating is provided, and when writing data, the same data is written in the management area before updating, the data area, and the management area after updating in order. A writing method to a non-contact IC card, which is characterized by checking whether the management area before update and the management area after update are the same when reading data. 4. When the management area before update and the management area after update are the same, it is determined that the writing to the data area of the memory was normal, and when they are not the same, the writing to the data area of the memory is performed. 4. The recovery processing of the data area is performed by determining that the error has occurred, and the recovery processing of the data area is performed.
Writing method to the non-contact IC card described in. 5. The non-contact IC card writing method according to claim 3, wherein the data in the management area before update and the management area after update are erased after each check.