JPH0744740A - Non-contact ic card system - Google Patents

Abstract

PURPOSE:To process one traveling object which securely corresponds to one traveling station even if a base station does not check whether one traveling object is processed for more than twice or not. CONSTITUTION:When a non-contact IC card receives a transmission request command from a road machine, a tollgate number in the command and present time are held in a memory 28. At the time of receiving the next transmission request command, a tollgate number in the command is compared with the tollgate number at previous processing time in the memory (step S1). When they coincide, it is checked Whether prescribed time passes or not from previous time based on present time in the command and time at previous processing time in the memory (step S2). When prescribed time does not pass, response data is not returned to the road machine. Only when the tollgate number is not equal to previous time or when prescribed time passes from previous time, present time and the tollgate number in the command are held in the memory 28, and a response is returned to the road machine (steps S3 and S4).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention transmits a command wirelessly from a base station installed in a fixed location to a mobile station having a contactless IC card structure installed in a mobile unit. Relates to a contactless IC card system for transmitting corresponding response data to a base station.

[0002]

2. Description of the Related Art A typical example of this type of contactless IC card system is an automatic vehicle identification system, that is, an AVI (Automatic Vehicl) system applied to a toll collection system for toll roads.
e Identification) system is known. This AV
The I system will be described with reference to FIG. 5 by taking an AVI-only lane on a flat-rate road as an example.

In the system shown in FIG. 5, a roadside machine 1 having a transmitting antenna 17 and a receiving antenna 18 is installed at a tollgate, and a tollgate data processing device 5 connected to a center computer 4 is further installed. There is. on the other hand,
The non-contact IC card 6 forming a mobile station is installed on the windshield of the vehicle 7, for example. Further, a vehicle type identification device 8 is installed on the upstream side of the vehicle 1 in the vehicle traveling direction,
A start guide signal light 9, a start warning light 10, a start detection device 11, and an ITV camera 12 are installed on the downstream side of the road machine 1. The signal flow between these devices is as shown in FIG.

Now, the vehicle type discriminating device 8 includes the vehicle separator 3
5, 36, a shaft number / axle distance detector 37, and a vehicle height detector 38
The vehicle length detector 39, the overhang detector 40, the image pickup device 41, and the image processing device 42.

The vehicle separators 35 and 36 prevent the passage of the vehicle 7 by one.
Each vehicle is detected separately, and it also operates as a vehicle detector. The number of axles / axle detector 37 is a vehicle separator 35,
The number of axles and the axle distance are detected for each vehicle passing through 36.

The vehicle height detector 38 measures the vehicle height, for example, for determining the size of a bus and for determining whether the vehicle is a passenger vehicle. The vehicle length detector 39 measures the vehicle length in order to identify a light vehicle. The overhang detector 40 measures the overhang length when the first axis of the vehicle passes in order to determine the vehicle shape of the bus or truck.

The image pickup device 41 photographs the license plate of the vehicle, and the image processing device 42 processes the image signal from the image pickup device 41 to detect the size of the number play and the vehicle number. The vehicle type identification device 8 is a vehicle separator 35,
The number of axles, axle distance, vehicle height, vehicle length, overhang length, size of license plate and vehicle number (particularly vehicle classification number) for each vehicle detected in 36 Five types of vehicle types are identified: large vehicles, oversized vehicles, medium-sized vehicles, and light vehicles.

Next, the start detection device 11 makes one passage of the vehicle.
It is equipped with a vehicle separator 43 that separates and detects the cars one by one, and a tread type axis number detector 44 that detects the number of axes of the passing vehicle. To be reset.

The operation of the system of FIG. 5 having the above configuration is as follows. First, when the roadside machine 1 can read the ID information (ID number) and the remaining amount of the entering vehicle, the vehicle is allowed to pass by a free pass, and the start detection device 11 detects the passage of the vehicle. When you do, remove the block. At this time, the roadside machine 1 receives the entrance toll gate number, date and time, etc. as entrance information from the data processing device 5, transmits the information to the non-contact IC card 6 via the antenna 17, and records it on the card 6. .

In the system shown in FIG. 5, in order to prevent the use of a stolen non-contact IC card or a non-contact IC card with insufficient balance, I of this type of non-contact IC card is used.
A list of D numbers is given from the center computer 4 to the data processor 5, and it is checked whether or not the ID number from the roadside machine 1 is normal. The data processing device 5 gives the check result of the ID number to the roadside device 1, and if the result is normal, the roadside device 1 outputs the entrance information to the non-contact IC.
If the start guide signal light 9 is changed from red to blue on the card 6 and the start detection device 11 detects the passage of the vehicle, the start guide signal light 9 is returned to red and prepared for the next vehicle. In addition, the start warning light 10 is activated while the start guidance signal light 9 remains red, and the ITV camera 1
According to 2, the front of the vehicle is photographed and recorded. Here, when the start detection device 11 detects the passage of the vehicle, the operation of the start warning lamp 10 is stopped and the ITV camera 12 is operated.

In such an AVI system (charge collection system), the vehicles generally enter continuously, so that the next vehicle can be discriminated by the vehicle type discrimination device 8 before the preceding vehicle passes the start detection device 11. Even in the case where the vehicle enters, the process for the preceding vehicle and the process for the next vehicle are performed in parallel so that the process is correctly performed.

[0012] In the above AVI system (charge collection system), the roadside machine 1 is required to perform processing for one vehicle, that is, one non-contact IC card 6 installed in the vehicle without fail. There is 1 for each passing vehicle
It is prohibited to process multiple non-contact IC cards.

Therefore, in the conventional system, in order to prevent the above-mentioned inconvenience, it is checked whether or not one non-contact IC card has been processed twice or more in succession in the ground equipment such as the road equipment 1 or the data processing device 5. Is supposed to do. For example, an ID number assigned to each contactless IC card for identifying an individual or a vehicle
It is stored in advance in the memory of the card, and the roadside device 1 reads the ID number wirelessly, and if the same ID number is detected twice in succession, it is judged to be read twice and ignored.

[0014]

However, in the conventional system, as shown in FIG.
In the area (communication area) 70 where communication with the card is possible,
There is a problem when multiple vehicles enter. This will be described below.

In FIG. 7, a non-contact IC card 6A is attached to (the windshield of) the first vehicle 7A. In addition, the non-contact IC card 6 is attached to the second vehicle 7B.
B has a non-contact IC card 6C on the third vehicle 7c,
Each is installed.

When a traffic jam occurs in the state shown in FIG. 7, the roadside device 1 first communicates with the non-contact IC card 6A to process the vehicle 7A, and then communicates with the non-contact IC card 6B to perform the vehicle communication. The processing of 7B is performed, and then the vehicle 7C is processed by further communicating with the non-contact IC card 6C, but thereafter, the vehicle may communicate again with the non-contact IC card 6A.

Therefore, it is not sufficient to perform the above-mentioned check by the ground unit (base station), that is, whether or not the same vehicle (non-contact IC card attached to the same vehicle) has been processed twice consecutively. In some cases, it is necessary to check whether or not the processing is the same as the processing performed two times before. In some cases, it may be necessary to check with a previously processed item, and the check process on the ground plane becomes complicated.

In addition, when traffic jam occurs in the state shown in FIG.
Non-contact IC card 6i (i is A, B, C from the roadside device 1)
When a plurality of non-contact IC cards 6i respond to a question (command) for any of (1), a reception error or the like may occur on the side of the roadside device 1 and correct response data may not be received.

The present invention has been made in consideration of the above circumstances, and an object thereof is to determine whether or not one mobile body (a non-contact IC card provided in the base station), that is, one mobile station is processed twice or more. An object of the present invention is to provide a non-contact IC card system capable of surely performing processing for one mobile unit corresponding to one mobile station without checking whether or not it is.

Another object of the present invention is to provide a contactless IC card system capable of preventing a mobile station which has already completed processing from interfering with the response of another (succeeding) mobile station.

[0021]

In order to solve the above problems, the present invention provides a command (transmission request command) transmitted from a base station to a mobile station (contactless IC card) installed in a mobile unit. This is characterized in that the mobile station checks the data, and when the certain condition is satisfied, the response data is not returned to the base station.

[0022]

In the above structure, when the mobile body enters the area where the base station and the mobile station can communicate with each other, the base station transmits to the mobile station (the non-contact IC card forming the mobile station) installed in the mobile body. Request command is sent. Upon receiving this transmission request command, the mobile station holds the data in the command in the memory in the mobile station and transmits response data to the base station.

Next, when the mobile station receives the transmission request command from the base station, the mobile station determines from the data in the command and the corresponding data in the previous processing stored in the memory, It is checked whether a certain fixed condition is satisfied, and if the certain fixed condition is satisfied, the operation of ignoring the command and holding the data in the command in the memory, and the response to the base station Do not send and receive data.

As a result, whether the response data is returned from the mobile station to the base station, including the transmission time (current time indicating), information for specifying the location where the base station is installed, etc. in the transmission request command. It is possible to determine whether or not the mobile station itself has been processed twice or more in one travel by using these pieces of information as the determination condition of whether or not it is determined that the mobile station has been processed twice or more. Since the mobile station does not return the response data to the base station, the base station does not need to perform a complicated check as to whether or not one mobile has been processed more than once. On the other hand, it is possible to reliably perform processing for one mobile unit.

Further, since the mobile station which has already completed the process does not reply to the same base station again, even if a plurality of mobile bodies are congested within the communicable area of the base station, the other mobile station Do not interfere with the response from.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A non-contact IC card system according to an embodiment of the present invention will be described below in the case of being applied to an AVI system.
This will be described with reference to FIGS. 1 to 4. The overall configuration of the system in this embodiment is the same as that of the conventional AVI system in FIG. 5 except for the communication processing and the like. Therefore, the description of the present embodiment will be made by using the system configuration of FIG. 5 together for convenience.

FIG. 2 shows an example of the configuration of the on-road device 1 that forms the center of the base station. The road machine 1 shown in FIG. 2 includes a controller 13 for controlling the entire road machine 1, a local oscillator 14 of, for example, a microwave, and a local oscillation signal from the controller 13 for requesting and writing to a non-contact IC card. A modulation circuit 15 that modulates various kinds of information such as unnecessary information and transmission request,
And a power amplifier circuit 16 for amplifying a modulated wave or a non-modulated wave. The signal modulated by the power amplifier circuit 16 is transmitted by the transmitting antenna 17.

The on-road machine 1 further outputs a preamplifier circuit 19 for amplifying the microwave signal from the non-contact IC card received by the receiving antenna 18, and the signal amplified by the circuit 19 to the local oscillator 20. And a demodulation circuit 23 for demodulating the detection output of the circuit 22 to obtain information from the non-contact IC card. Have

The on-road machine 1 is adapted to transmit a transmission request signal (transmission request command) each time it is detected by the vehicle type discrimination device 8 shown in FIG. 5 that the vehicle has entered the tollgate.

FIG. 3 shows a configuration example of the non-contact IC card 6. The non-contact IC card 6 shown in FIG. 3 uses a prepaid system, and a CPU that controls the entire card 6
The circuit 25 and the battery 2 serving as a driving power source for the CPU circuit 25 and the like.
7, a memory 28 in which the ID number and the amount of money when the card is issued (the remaining amount after use) are recorded, and a transmission / reception circuit 29. An antenna (transmission / reception antenna) 26 is connected to the transmission / reception circuit 29.

The transmission / reception circuit 29 is a circuit that controls the reception of radio waves such as microwave signals from the roadside device (1) and the transmission of signals to the roadside device (1). The switching circuit 30 and the detection circuit 3
1, demodulation circuit 32, microwave detection (μ detection) circuit 33
And a modulation circuit 34.

The switching circuit 30 gives the output of the modulation circuit 34 to the antenna 26 when the information is transmitted from the on-road unit (1). The detection circuit 31 detects the microwave from the roadside device (1) and supplies it to the demodulation circuit 32.
The demodulation of the detection output of (1) is given to the CPU circuit 25 with information such as a transmission request, a write request, and write information. When the microwave detection circuit 33 detects the microwave from the roadside device (1) through the detection circuit 31, it activates the CPU circuit 25. In response to the information from the demodulation circuit 32, the CPU circuit 25 stores in the memory 28 the write information such as the remaining amount (remaining amount of money) following the writing request. In the case of a transmission request, the CPU circuit 25 stores the ID recorded in the memory 28.
In addition to the number, necessary information such as the balance is read from the memory 28, given to the modulation circuit 34, and transmitted to the on-road unit (1).

Next, the road machine 1 having the structure shown in FIG. 2 and FIG.
The operation of the contactless IC card 6 having the configuration shown in FIG. 4 will be described with reference to the communication sequence shown in FIG. First, in the system configuration shown in FIG.
When the vehicle approach detection information and the vehicle type for the detected vehicle are received from FIG.
The transmission request command a is sent to the non-contact IC card 6 as shown in
Send to. This transmission request command a has the same command a
The current time (year, month, day, hour, minute,
Seconds) etc. are included.

When the non-contact IC card 6 receives the transmission request command a from the roadside device 1, the CPU circuit 25 reads the ID number, the vehicle type, the remaining amount, etc. in the memory 28, and FIG.
The read result b is transmitted to the on-road unit 1 via the antenna 26 as shown in FIG. Further, in parallel with this, the roadside machine 1 writes the current time and the like in the transmission request command a into the memory 28 by the CPU circuit 25 and holds the contents.

The on-road machine 1 receives the read result b from the non-contact IC card 6 via the receiving antenna 18. Then, the roadside device 1 determines the ID based on the received reading result b.
Number check, vehicle type check, balance check, etc.
Here, the ID number check is a table (black list table) in which ID numbers of contactless IC cards that have been stolen or lost have been registered in order to prevent unauthorized use of the contactless IC cards due to theft or loss. It is to check whether or not there is a match with the read ID number. The vehicle type check is to check whether or not the vehicle type discriminated by the vehicle type discriminating device 8 is the same as the read vehicle type. The balance check is the balance of the contactless IC card 6 from the toll for the relevant vehicle type. It also checks whether or not a lot remains.

When all the results of these series of checks are normal, the roadside machine 1 transmits the write request command c to the non-contact IC card 6 via the transmitting antenna 17, as shown in FIG.

In the system applying the communication sequence between the on-road device 1 and the non-contact IC card 6 as described above, the non-contact IC card 6 performs the processing unique to this embodiment described below.

When the non-contact IC card 6 receives the transmission request command a from the roadside device 1, it checks the current time in the command a and checks the current time in the previously received transmission request command stored in the memory 28. If a certain period of time has not passed from the current time (that is, the time processed last time), it is determined that the vehicle 7 to which the card 6 is attached is read twice by one run, and the transmission request command a is read. It is ignored and the read result b is not transmitted.

That is, the non-contact IC card 6 holds the current time and the like in the transmission request command a in the memory 28 only when a certain time (for example, several minutes to several hours) has passed since the previous process. At the same time, a response (read result b) to the roadside machine 1 is returned.

It is possible to include not only the above-mentioned time but also the installation location, order, etc. of the roadside machine 1 as the condition for determining whether or not to respond to the roadside machine 1. Therefore, in addition to the check of the time when the transmission request command a is received, the operation when the transmission request command of the non-contact IC card 6 is received when the check of the toll gate number indicating the installation location of the roadside device 1 is applied, This will be described with reference to the flowchart of FIG.

Here, in the transmission request command a from the roadside machine 1, in addition to the current time (transmission request time), the roadside machine 1
Include a toll gate number that can identify the toll gate where is installed.

When the non-contact IC card 6 receives the transmission request command a including the toll gate number and the current time and responds with the read result b, the current time in the command a and the toll gate in the command a are returned. The number is retained in memory 28.

After this series of processes, when the non-contact IC card 6 receives the transmission request command a from the roadside device 1 again, the toll gate number in the command a is stored in the memory 28 the last time. It is checked whether it is the same as the toll gate number in the received transmission request command (step S1).

If the toll gate numbers are different,
The contactless IC card 6 holds the current time and the toll gate number in the transmission request command a in the memory 28 (without checking the time), and also returns a response (read result b) to the on-road machine 1 ( Steps S3, S4).

On the other hand, if the toll gate numbers match, the contactless IC card 6 checks the current time in the received transmission request command a, and checks the current time in the previously received transmission request command stored in the memory 28. It is checked whether or not a certain fixed time has elapsed from the current time (the time processed last time) (step S2).

If a certain period of time has passed since the previous process, the contactless IC card 6 is not read twice by the vehicle 7 even if the toll gate numbers match. The determination is made, the current time and toll gate number in the transmission request command a are held in the memory 28, and a response (read result b) to the roadside machine 1 is returned (steps S3 and S4).

On the other hand, if a certain period of time has not passed from the previous process, the non-contact IC card 6 determines that the vehicle 7 is read twice and ignores the transmission request command a. However, the response data (read result b) is not transmitted.

In the above-mentioned embodiment, the case where the invention is applied to the AVI system applied to the toll collection system for toll roads is explained, but the invention is not limited to this, and the present invention is installed in a base station and a mobile body. The present invention can be applied to a non-contact IC card system that wirelessly communicates with a mobile station (non-contact IC card), that is, FA, entry / exit management, ski lift ticket management, and other systems.

[0049]

As described above in detail, the non-contact IC of the present invention
According to the card system, the mobile station checks the data in the command wirelessly transmitted from the base station (ground equipment side) to the mobile station (constituting the non-contact IC card), and the data checks a certain fixed condition. If it is satisfied, it is assumed that the processing for one mobile unit (mobile station) has been performed twice or more in succession, and the response data is not returned to the base station. It is possible to reliably perform processing for one mobile unit corresponding to one mobile station without performing a complicated check as to whether or not the body has been processed twice or more.

Further, according to the present invention, as described above,
Since a mobile station that has already completed processing does not reply to the same base station again, even when multiple mobile units are congested within the coverage area of the base station, the response from other mobile stations is blocked. do not do.

[Brief description of drawings]

FIG. 1 is a flowchart showing a processing procedure when a transmission request command is received by a contactless IC card in an AVI system according to an embodiment of the present invention.

FIG. 2 is a diagram showing a block configuration of a roadside machine in the embodiment.

FIG. 3 is a diagram showing a block configuration of a non-contact IC card in the embodiment.

FIG. 4 is a sequence diagram for explaining a communication sequence between a roadside device and a non-contact IC card in the embodiment.

FIG. 5 is a block diagram showing a system configuration of an AVI system to which a non-contact IC card system is applied.

6 is a control block configuration diagram on the side of a roadside machine 1 in the system configuration of FIG.

FIG. 7 is a diagram showing a state in which a plurality of vehicles are entering a communication area in which communication can be performed between a roadside device and a non-contact IC card.

[Explanation of symbols]

1 ... Road machine, 5 ... Data processing device, 6
... Non-contact IC card, 7 ... Vehicle, 17 ... Transmission antenna, 18 ... Reception antenna, 25 ... CPU
Circuit, 26 ... Antenna, 28 ... Memory,
a ... Send request command, b ... Read result.

Claims (1)

[Claims] 1. From a base station installed at a fixed location,
In a contactless IC card system for wirelessly transmitting a command to a mobile station installed in a mobile body, the mobile station transmitting response data corresponding to the mobile station to the base station, A contactless IC card system, characterized in that data in an instruction is checked, and when the data satisfies a certain condition, the response data is not returned to the base station.