JP2000155813A - Non-contact ic card/reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To exactly receive a response frame from an IC card for transmitting a response frame to any slot of the arbitrary number of time slots, in a simple constitution. SOLUTION: A reader/writer 2 for receiving each response frame from plural IC cards for transmitting the response frame to any time slot amount plural time slots in response to a request for the output of data is provided with a timer. Then, a time value t1 since the request for the output of data is issued to each IC card 31-3n until the output of the response frame is completed in the last time slot TSn is set in the timer. Then, a CPU provided in the reader/ writer 2 repeatedly executes each operation of the detection of the start bit of the response frame, the reception of data, and the detection of the stop bit of the response frame until the time-up of the timer.

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 reader for identifying a plurality of IC cards.

[0002]

2. Description of the Related Art In recent years, IC cards have been frequently used as cards. Among these IC cards, there is a non-contact type IC card, and a plurality of non-contact type IC cards are usually used at a predetermined mounting position of a card reader. When a card reader identifies a plurality of non-contact type IC cards, it identifies them by a unique serial number SN different for each IC card.

In this case, the response timing of each IC card is divided into time slots, and when a data output request is output from a card reader, each IC card uses its own serial number SN in a time slot determined by a random number.
Is returned to the card reader.

[0004] Figure 4 shows an example of the output timing of the response frame data when four IC card 3 ₁ to 3 ₄ are placed at a predetermined mounting local disks interrogator (card reader) 2 It is. When the IC card 3 ₁ to 3 ₄ receives the data output request from the reader-writer 2 generates a random number based on its serial number SN, 4 time slots TS1~T in accordance with the generated random number
One of S4 is defined as its own time slot. In the example of FIG. 4, IC card 3 in ₁ time slot TS3, IC card 3 ₂ timeslots TS1, I
Time slot of C card 3 ₃ is TS4, IC card 3
_In this example, _four time slots are defined as TS2.

In this case, the reader / writer 2 detects presence / absence of response frame data from the IC card and presence / absence of collision of the response frame data for each time slot to identify the IC card. That is, the reader / writer 2 recognizes the time slot TS1 at the time of FIG. 4 and starts detecting the response frame data. When the response frame data of the time slot TS1 is detected, the serial number included in the response frame data is detected. It recognizes that from SN is a response data of the IC card 3 _2. Next, the reader / writer 2 recognizes the time slot TS2 at the time and starts detecting the response frame data.
When the response frame data is detected, it recognizes that it is the response data of the IC card 3 ₄ serial number SN included in the response frame data. Subsequently, the time slot TS3 is recognized at the time and the detection of the response frame data is started. When the response frame data of the time slot TS3 is detected, the IC card 3 _{1 is obtained} from the serial number SN included in the response frame data.
Recognize that the response data is Finally, recognizing the time slot TS4 starts detection of the response frame data at the time, when the response frame data of the time slot TS4 is detected, the serial number SN of the IC card 3 ₃ contained in the response frame data Recognize that it is response data.

If the collision of response frame data from a plurality of IC cards is detected when response frame data of one time slot TS is detected, the reader / writer 2 detects the serial number SN again. Thus, one card can be selected.

[0007]

In the conventional card reader device, each predetermined time slot is assigned to a slot TS.
Since the IC card is identified by detecting the response frame data of each time slot by sequentially recognizing the time slots starting from 1, if the time slot is defined as, for example, four slots, only the response frames corresponding to the number of the four slots are detected. I couldn't do that. For this reason, such an I-frame that transmits a response frame via the fifth or sixth slot of, for example, six time slots larger than the fixed number of slots is used.
When a frame is received from a C card, there is a problem that it cannot be easily handled. Accordingly, it is an object of the present invention to accurately receive a response frame from an IC card that transmits a response frame to any one of an arbitrary number of time slots with a simple configuration and identify the IC card.

[0008]

SUMMARY OF THE INVENTION In order to solve such a problem, the present invention provides a method for transmitting a response frame to each of data transmission requests via any one of a plurality of time slots. In the non-contact type IC card reader for receiving each response frame from the IC card, from the time of the data output request to the time of completion of the transmission in the last time slot of the plurality of time slots in which the response frame is transmitted Time means for variably counting the time until the start time of the response frame according to the number of time slots, and time means for detecting the start bit of the response frame, receiving the data following the start bit, and detecting the stop bit following the data. And a response frame receiving means for repeatedly executing until the time counting operation is completed.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a non-contact type IC card reader according to the present invention. In the figure, a reader / writer 2 which is a non-contact type IC card reader
Is connected with and is connected the IC card 3 ₁ to 3 _n and the radio placed on the predetermined mounting local disks of the reader-writer 2, for example a game (services) host that provides such (terminal) 1 is, reads the data of the radio connection to the IC card and 3 ₁ to 3 _n sent to the host 1, I
The game (service) based on the use of the C card is permitted.

In FIG. 1, a reader / writer 2 has a CPU
21, a digital processing unit 22, a wireless transmission / reception unit 23, a timer 24, and an antenna AT. In addition, each IC card 3
Each of _{1 to} 3 _n includes a controller 31, a memory 32, a wireless transmission / reception unit 33, and an antenna AT.

When the IC card 3 is placed at a predetermined place, the CPU 21 of the reader / writer 2 sends a data output request to the digital processing unit 22. This data output request is transmitted to the digital processing unit 22, the wireless transmission / reception unit 23, and the antenna AT.
Is transmitted to the IC card side as a wireless signal via the. IC
When the controller 31 of the card 3 receives a wireless signal indicating a data output request via the antenna AT and the wireless transmission / reception unit 33, its own serial number SN stored in the memory 32 in advance (a unique card unique to each card, Number) and value information (money information), and outputs data including the serial number SN to the wireless transmission / reception unit 33 as response frame data in a time slot indicating its own transmission timing.

The response frame data is transmitted to the reader / writer 2 as a radio signal via the antenna AT. The response frame data is transmitted to the CPU 21 via the antenna AT of the reader / writer 2, the wireless transmission / reception unit 23, and the digital processing unit 22. CPU 21 of reader / writer 2
Receives the response frame data, and identifies the IC card based on the card-specific serial number SN included in the response data. Then, the recognized serial number SN and value information are sent to the host 1, and the host 1 performs authentication corresponding to the received serial number SN of the IC card and determines whether or not to permit services such as games according to the presence or absence of the value information. Judge.

Each of the IC cards 3 _{1 to} 3 _n determines its own transmission time slot by using the reader / writer 2.
Controller 31 when a data output request is received from
Stores the serial number SN unique to the card in the memory 32.
, A random number is generated based on the serial number SN, and one of the time slots TS1 to TSn is assigned according to the generated random number value. Then, a response frame including its own serial number SN is transmitted to the reader / writer 2 via the time slot.
Send to the side.

[0014] FIG. 2, IC card 3 in ₁ time slot TS3, IC card 3 ₂ of time slot TS1,
IC card 3 ₃ timeslot TSn, IC card 3 _n time slots are examples defined respectively as TS2.

Here, a response frame transmitted from each of the IC cards 3 _{1 to} 3 _n to the reader / writer 2 has a format as shown in FIG. That is, the start bit STB is added to the beginning of the response frame,
A stop bit SPB is provided at the end of the response frame, and data DA such as a serial number SN and value information is provided between the start bit STB and the stop bit SPB.
TA is assigned.

The response data of one frame is shown in FIG.
As shown in, the first time slot TS1 IC card 3 _2, from the next time slot TS2 in the IC card 3 _n, from the IC card 3 ₁ In the subsequent time slot TS3, the last time slot TSn the IC card 3 ₃ Are sequentially transmitted to the reader / writer 2 side. Such, when receiving the response frame transmitted in each time slot, the reader-writer 2, from the time of performing a data output request to the IC card 3 ₁ to 3 _n, the response in the last time slot TSn The time value until the frame is completely output (that is, the time value t1 shown in FIG. 2) is set in the timer 24, and the CPU 21 monitors the arrival of the response frame while the timer 24 times out.

That is, the CPU 21 of the reader / writer 2
Sends C data output request to the card 3 ₁ to 3 _n, when the transmission is completed, it sets the time value t1 shown in timer 24 in FIG. 2 to start the timer 24. Thereafter, the digital processing unit 22 shifts to the operation of detecting the start bit STB of the response frame. Then, when the start bit STB is detected, the data DATA of the response frame is received next, and finally, the stop bit SPB of the response frame is detected. When the stop bit SPB is detected, the CPU 21 is notified that the reception of the response frame of the first time slot TS1 is completed. Then C
The PU 21 proceeds to the operation of detecting the start bit STB of the next response frame.

The CPU 21 repeatedly executes such a response frame receiving operation until the timer 24 times out. Thereby, the reader / writer 2 can receive all the response frames of each IC card sequentially transmitted through the time slots TS1 to TSn. In addition,
If the transmission slots of each IC card are determined as four TS1 to TS4, the reader / writer 2 sets the time t
1 is set as the time at which the output of the response frame is completed in the last time slot TS4 from the time when the data output request is made to each IC card, and is set in the timer 24. Perform the operation. Also, the transmission slot of each IC card is T
If eight are set as S1 to TS8, the reader / writer 2 sets the above-described time value t1 as the time from when the data output request is made to each IC card to when the output of the response frame is completed in the last time slot TS8. Timer 2
4 and the above-described response frame receiving operation is performed until the timer 24 times out.

As described above, the reader / writer 2 determines the timer value of the timer 24 according to the number of time slots, detects the start bit STB of the response frame, receives the data DATA, and stops the stop bit until the timer 24 times out. Each operation of SPB detection is repeatedly executed. As a result, since the response frame from each IC card can be received without being aware of the time slot, even if an IC card transmitting its own response frame to any of the eight time slots appears in the future, for example, By simply changing only the timer value of the timer 24, a response frame from such an IC card can be accurately detected and the IC card can be identified.

Here, the IC card (IC card 3 _{2 in} the example of FIG. ₂ ) for transmitting the response frame in the first time slot TS1 is not placed at a predetermined place, and therefore, the response frame is not transmitted from the IC card. If not,
By detecting the start bit STB of the response frame of the next time slot TS2, the reader / writer 2 can sequentially receive the response frame of the slot TS2.

Further, for example, an IC card (IC card 3 _{1 in} the example of FIG. 2) for transmitting a response frame in the time slot TS3 is not placed at a predetermined place, and
Even when a response frame is not transmitted from the C card, after receiving each response frame of the time slots TS1 and TS2, by detecting the start bit STB of the response frame of the time slot TS4, the response frames can be sequentially received from the response frame. . If the start bit STB of the response frame cannot be detected at all even if the response frame detection operation described above is continued until the timer 24 times out, the reader / writer 2 places the IC card at the predetermined mounting location. It is determined that it has not been performed.

A plurality of IC cards transmit response frames in the same time slot TS. As a result, data of each IC card collides in the time slot TS, and the serial number SN is duplicated and detected (collision occurs). If detected, one IC card is selected by requesting retransmission of response frame data.

[0023]

As described above, according to the present invention, each response from a plurality of IC cards for transmitting a response frame to a data output request via any one of a plurality of time slots is transmitted. The time from the time of the data output request to the last time slot in which the response frame is transmitted among the plurality of time slots to the completion time of the transmission is transmitted to the IC card reader that receives the frame as the number of time slots. A timing means for variably timing according to the timing, and repeatedly performing operations of detecting a start bit of a response frame, receiving data following the start bit, and detecting a stop bit following the data until the timing operation of the timing means is completed. Response frame receiving means, which allows each IC card to be You can receive the response frame. As a result, a response frame of each IC card which transmits a response frame to any one of an arbitrary number of time slots is accurately received by a simple configuration, and each IC card is appropriately received.
The card can be identified.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of the present invention.

FIG. 2 is a diagram illustrating a transmission timing of a response frame of each IC card and a reception operation of a card reader that receives the response frame.

FIG. 3 is a diagram showing a format of a response frame transmitted from an IC card.

FIG. 4 is a diagram showing a receiving operation of a conventional card reader that receives a response frame from each IC card.

[Explanation of symbols]

1 ... Host (terminal), 2 ... non-contact reader-writer, 3 ₁
To 3 _n ... IC card, 21 ... CPU, 22 ... digital processing unit, 23 and 33 ... wireless transceiver, 24 ... timer, 31
... Controller, 32 ... Memory, AT, AT1 to ATn
…antenna.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G01S 13/76 G01S 13/80 13/79 H04B 5/02 (72) Inventor Jin Takagi Meguro-ku, Tokyo 2-3-2 Meguro F-term in Tamura Electric Manufacturing Co., Ltd. (reference) 2C005 MA27 MB05 NA08 SA06 TA22 5B058 CA17 CA23 KA40 YA20 5J070 AK22 BC13 BC25 BC29 5K012 AB05 AB12 AB18 AB19 AC09 AC11 AD04 AE12 BA03 BA07 BA14

Claims (1)

[Claims] 1. A non-contact type IC card reader for receiving each response frame from a plurality of IC cards transmitting a response frame to each of the data output requests via any one of the plurality of time slots. The time from the time of the data output request to the completion of the transmission in the last time slot of the plurality of time slots in which the response frame is transmitted is variably timed according to the number of time slots. And a response frame for repeatedly executing operations of detecting a start bit of the response frame, receiving data following the start bit, and detecting a stop bit following the data until the timekeeping operation of the timer is completed. A non-contact type IC card reader comprising a receiving unit.