JP2001223650A - Checker for reception reply unit and etc checker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ETC checker that can surely and simply confirm the operation of a reception response unit, such as an ETC vehicle mount unit, together with a transmission reception function of a radio wave, while being mounted on a movable body. SOLUTION: The ETC checker transmits FCMC data to an ETC vehicle mounting unit, receives ACTA data sent from the vehicle mount unit in response to the FCMC data, evaluates the received ACTC data and decides on the propriety of the vehicle mount unit, on the basis of the evaluation result.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a checker for a reception transponder which checks the operation of a reception transponder mounted on a mobile body, such as a vehicle-mounted device of an automatic toll collection system (ETC: Electronic Toll Collection), in a non-contact manner. .

[0002]

2. Description of the Related Art On a toll road, information necessary for toll collection is exchanged between a roadside apparatus and a vehicle-mounted device mounted on a vehicle by wireless communication means, and a toll road user travels on a non-stop road. A non-stop automatic toll collection system (ETC) that collects tolls has been developed and is being considered for practical use.

FIG. 3 shows an outline of the system configuration of the ETC. The system main body 30 is composed of a roadside apparatus 31 and a roadside antenna 32 attached to a structure 33. The system main body 30 is provided at a tollgate on a toll road or the like. On the other hand, vehicle 4 passing on toll road
At 0, the on-vehicle device 41 is attached at a position where transmission and reception can be performed with the roadside antenna 32.

[0004] In addition to components required for communication with the system body 30 such as an antenna, a control unit, and a display unit, an IC card for toll payment is inserted into the vehicle-mounted device 41 (these are not shown). are doing).

[0005] As shown in FIG. 3, ETC is a short-range communication (D) that performs communication in a very small area (several meters to several tens of meters).
SRC: Dedicated Short Range Communication) is used. When the vehicle 40 approaches the system main body 30, the wireless system of the vehicle-mounted device 41 and the roadside wireless device 31 mutually exchange information required for toll collection by wireless communication means. Then, the toll is settled on the IC card, and necessary data accompanying the toll is recorded in both the vehicle-mounted device 41 and the system body 30.

The communication procedure of the ETC is performed as follows. FIG. 4 shows an example of communication in the case of the 5-slot length. Communication is performed on a frame basis, and one frame is composed of an FCMC (frame control message channel) slot and four message slots SL1.
To SL4. Each slot has a width of, for example, 800 bits.

[0007] The roadside apparatus always transmits FCMC1 at a predetermined timing. This transmission of FCMC1 is continued as long as there is no response from the vehicle-mounted device 41. Note that the FCMC1 contains a message such as "Receive the vehicle-mounted device that has received FCMC1 to return ACTC (activation channel) data in slot SL4."

When the vehicle-mounted device 41 enters the communication area and the time t1
Receives the FCMC1 and recognizes the FCMC data, and transmits the address information of its own vehicle-mounted device as ACTC data according to the message (frame 1, frame 1).
SL4).

When receiving the ACTC data, the roadside apparatus 31 reads the address of the on-vehicle device 41 included in the ACTC data, captures the address as the link address in the next data after the FCMC 2, and specifies the on-vehicle device 41. or,
In front of the link address, a designation symbol for designating whether the vehicle-mounted device 41 of the designated link address receives or transmits data together with the slot number is added. In the example of FIG. 4, transmission of a message from the roadside apparatus 31 (reception by the vehicle-mounted device 41) is performed in the slot SL3 in FCMC2 (frame 2) and in FCMC3 (frame 3).
In the slot SL3, a message is transmitted (received by the roadside apparatus) from the vehicle-mounted device 41 in the slot SL3.

As described above, the data is exchanged between the vehicle-mounted device 41 and the roadside apparatus 31 while sequentially updating the FCMC data, and the processing is performed. Therefore, for example, when there is an abnormality in the vehicle-mounted device 41, it is highly likely that the abnormality is discovered through data exchange between the vehicle-mounted device 41 and the roadside apparatus 31 at an actual toll road or the like.

The vehicle-mounted device 41 usually has a self-diagnosis function in order to confirm the operation after mounting on a car or the like, and can read the IC card and inspect the connection state of the antenna and the like. It is configured as follows.

[0012]

However, the self-diagnosis function of the vehicle-mounted device can perform an inspection inside the vehicle-mounted device, but the operation including the transmission / reception function of a radio wave with the vehicle-mounted device mounted on the vehicle. Performance check cannot be performed.

[0013] Further, even if an abnormality of the vehicle-mounted device is found under actual use conditions such as a tollgate on a toll road,
There are problems such as causing trouble between the road manager and the vehicle owner.

The present invention has been made in order to solve such a problem. The operation of a reception response device such as an on-board ETC device can be confirmed by including a radio wave transmission / reception function while being mounted on a mobile object. An object of the present invention is to provide a checker for a reception response device that can be performed reliably and easily.

[0015]

According to a first aspect of the present invention, there is provided a checker for a reception transponder, comprising: a reception responder mounted on a mobile object; Transmitting a signal, receiving a wireless signal transmitted from the reception responding device in response to the transmission, evaluating the received signal, and performing a pass / fail determination of the receiving device based on the evaluation result. I do.

An ETC checker according to a second aspect of the present invention is an automatic toll collection system (ETC) mounted on a vehicle.
Transmitting frame control message channel (FCMC) data to the vehicle-mounted device; receiving activation channel (ACTC) data transmitted from the vehicle-mounted device in response to the FCMC data;
The TC data is evaluated, and the quality of the vehicle-mounted device is determined based on the evaluation result.

According to a third aspect of the present invention, in the ETC checker according to the second aspect, the evaluation is performed based on whether or not the ACTC data is received in a time zone to be received. .

The ETC checker according to a fourth aspect of the present invention is the ETC checker according to the second aspect, wherein the evaluation is performed using an error detection code in the ACTC data.

According to a fifth aspect of the present invention, in the ETC checker according to the second aspect, the evaluation is performed by using an identification number field (FI) in the FCMC data.
D) and the FID in the ACTC data.

According to this configuration, the operation check of the on-board ETC device can be performed in a non-contact and simple manner in a short time by transmitting and receiving radio waves in a state where the on-board ETC device is mounted on the vehicle. Therefore, it is of course applicable to the inspection before shipment in the manufacturing factory, but it can also be used for the inspection after mounting at each dealer or maintenance shop.

Further, the present invention can be applied not only to the ETC but also to a system in a parking lot, a drive-through, etc., which communicates by the short-range communication DSRC similarly to the ETC.

The ACT transmitted from the on-board ETC device
Since the evaluation of the C data is performed based on whether or not the ACTC data is received in a time zone in which the AC data should be received, it is easy to distinguish the C data from noise or the like.

The ACT transmitted from the on-board ETC device
Since the evaluation of the C data is performed using the error detection code included in the ACTC data, the inspection can be performed simply and reliably.

The ACT transmitted from the on-board ETC device
Since the evaluation of the C data is performed based on the identity of the FID in the FCMC data and the FID in the ACTC data, which is supposed to be the same, the inspection can be performed easily and reliably.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings, taking an example of an ETC checker for checking the operation of a vehicle-mounted ETC device in a non-contact manner.

FIG. 1 shows an ETC according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating a configuration of a checker together with an in-vehicle device. 2 shows the data structure used in the ETC checker 10. FIG. 2A shows the frame structure, FIG. 2B shows the format of the FCMC1, and FIG.
Each format of CTC is shown.

In FIG. 1, the ETC checker main unit 11 includes a system control unit 12, a display unit 13, an operation unit 14, an external I / F unit 15, a data transmission / reception control unit 16, and 5.8.
And a high-frequency unit of GHz, and transmits and receives data to and from the vehicle-mounted device 20 via the antenna unit 18.
Incidentally, the antenna section 18 may be integrated into the ETC checker main body section 11 to be integrated.

The transmission data FCMC1 is shown in FIG.
FCM transmitted from the roadside wireless device of ETC
It has the same configuration as C1, and communication is performed in frame units. One frame includes a slot of FCMC and 4
It comprises one message slot SL1 to SL4. In the ETC checker of the present invention, unlike the roadside apparatus, the FCMC uses the AC
The configuration is such that only FCMC1 for transmitting TC is repeatedly transmitted.

The data format of this FCMC1 is
The configuration is as shown in FIG. PR is a preamble, UW1 is a unique word for TDMA frame synchronization, SIG is a transmission channel control field such as channel configuration information, FID is a base station identification number field,
FSI is a frame configuration information field, RLT is a release timer information field, SC is a base station service application information field, SCI (1) to (8) are communication slot allocation slot control information fields, and CRC is an error detection code. .

The ACTC data format is as follows:
The configuration is as shown in FIG. ACTC
Part of (1) to (8) is used. PR is a preamble, UW1 is a unique word for TDMA frame synchronization, FID is an identification number field that uses the FID transmitted from the base station as it is, LID is a link address field, LRI is a link request information field,
CRC is an error detection code.

Now, the function of the ETC checker 10 thus configured will be described together with the configuration of data to be transmitted and received.

The ETC checker 10 is configured to be portable so that the operator can carry it arbitrarily, and is mounted at a predetermined position near a windshield inside the vehicle.
For example, the vehicle-mounted device 20 is approached from the outside of the vehicle to enter a communicable state.

When the test is started by operating the operation unit 14, the data transmission / reception control unit 16 transmits the transmission data FCMC1.
Is generated and the data is supplied to the high frequency unit 17. The transmission data FCMC1 is transmitted to the high frequency section 17 at 5.8 GHz.
It is mounted on a carrier wave of the band and emitted as a radio wave through the antenna unit 18. As shown in frame 0 of FIG.
While the ACTC data, which is a response signal from, is not received, FCMC1 is repeatedly transmitted.

When the antenna unit 18 of the ETC checker 10 is brought close to the vehicle-mounted device 20 and the vehicle-mounted device 20 normally receives the radio wave emitted from the antenna 18, the frame 1 in FIG.
The in-vehicle device 20 creates and transmits an ACTC as in the slot SL4.

In the antenna section 18 of the ETC checker 10,
When this ACTC data is received, the high frequency section 17 detects the received data, and sends the received ACTC data to the transmission / reception control section 16.

The ACTC data received by the data transmission / reception control unit 16 is evaluated, and based on the evaluation result, the acceptability of the on-board ETC device 20 is determined and displayed on the display unit 13.

The transmitted and received data FCMC1, A
The CTC is output by the external I / F unit 15 to an external device such as a personal computer.

Here, the evaluation of the received ACTC data in the data transmission / reception control unit 16 will be described.

First, as a first evaluation method, the ACT transmitted from the vehicle-mounted device 20 in response to the reception of the FCMC data.
C is predetermined so as to be arranged in a specific slot among the plurality of slots SL1 to SL4, in this example, SL4. After transmitting the FCMC data, the data transmission / reception control unit 16 waits for whether the ACTC data is received in the slot SL4. In this case, no ACTC is received in the other slots SL1 to SL3.
There is no need to recognize the contents of the CTC data, and it is checked whether any data has been received.

In the first evaluation method, the presence of ACTC data in a specific slot causes
Evaluates that it is operating normally. On the other hand, if the ETC checker 10 is sufficiently close to the on-vehicle device 20 but no ACTC data exists in a specific slot, the on-vehicle device 20 is evaluated as performing an abnormal operation. If the in-vehicle device evaluated as abnormal operation is judged to be good by internal diagnosis, etc., it is assumed that the failure is due to a failure of the radio wave transmission / reception unit including the antenna or a defect in the mounting position of the in-vehicle device. Is done.

As described above, the ACTC data transmitted from the on-board ETC device 20 need only be evaluated based on whether the ACTC data is received in the time slot SL4 where the ACTC data is to be received. Can be. In addition, it is easy to distinguish from noise and the like by comparing with other time slots.

Next, as a second evaluation method, the ACTC data transmitted from the ETC
This is performed using an error detection code CRC included in the TC data. This error detection code CRC is provided as standard equipment in the vehicle-mounted device 20 in order to enhance the reliability of the transmission data, and the data code (F) other than PR and UW2 in FIG.
ID, LID, LRI) based on a predetermined generator polynomial.

In the data transmission / reception control unit 16, the received A
By analyzing the CTC data, including the error detection code CRC, using the above-described generator polynomial, it is possible to recognize whether the received ACTC data is correct or not.
When the CTC data is positive, the vehicle-mounted device 20 is in the normal state,
When the TC data is incorrect, the in-vehicle device 20 can be evaluated as an abnormal state. Note that there are environmental conditions around the on-vehicle device 20 and it is considered that the ACTC data is affected by noise or the like. Therefore, as shown in FIG. It is desirable to increase the accuracy of the evaluation by acquiring ACTC data by using this method and recognizing the correctness.

As described above, the evaluation of the ACTC data transmitted from the ETC on-board unit 20 is performed using the error detection code CRC in the ACTC data provided as standard equipment in the on-board unit 20, so that the inspection can be performed simply and reliably. It can be performed.

Next, as a third evaluation method, the evaluation of the ACTC data transmitted from the on-board ETC
FID in MC data and AC which should be the same
This is performed based on the identity with the FID in the TC data.

FID is an identification number field of the base station, and is usually a roadside apparatus 31 on the ETC system main body side.
, A specific identification number is inserted into the FCMC data as an FID (FIG. 2B), and the same FID is inserted into the ACTC data as shown in FIG. 2C. In the present invention, by utilizing this usage of the FID, the assumed identification number is inserted as an FID into the FCMC transmitted from the ETC checker 10. Then, the data transmission / reception control unit 16 receives the A
The FID in the CTC data is compared with the assumed FID inserted in the FCMC.

As a result of this comparison, it is possible to recognize the coincidence or non-coincidence of the two, and by using this, the vehicle-mounted device 20 is in a normal state when the FID matches, and the vehicle-mounted device 20 is abnormal when the FID does not match. Condition, can be evaluated.
Note that there are environmental conditions around the on-vehicle device 20, which may be affected by noise or the like. Therefore, as shown in FIG.
It is desirable to obtain ACTC data a plurality of times, recognize FID matches or mismatches, and improve the accuracy of evaluation.

As described above, the evaluation of the ACTC data is easily and reliably checked by checking whether the FID in the FCMC transmitted from the ETC checker matches the FID in the ACTC data transmitted from the ETC on-board unit 20. It can be performed.

As described above, the evaluation of the ACTC data is performed by the three methods. However, it is effective to perform the evaluation by combining these three evaluation methods, and the combination can be arbitrarily determined.

In the above embodiment, the ETC checker for checking the operation of the vehicle-mounted ETC device has been described. However, the present invention is not limited to this. , And can be effectively used as a checker of a reception response device in a communication system such as a parking lot or a drive-through.

[0051]

According to the present invention, the operation check of the on-board ETC device can be performed in a non-contact and simple manner in a short time by transmitting and receiving radio waves while the vehicle-mounted ETC device is attached to the vehicle. Therefore, it is of course applicable to the inspection before shipment in the manufacturing factory, but it can also be used for the inspection after mounting at each dealer or maintenance shop.

Further, the present invention can be applied not only to the ETC but also to a system in a parking lot, a drive-through, etc., which communicates by the short-range communication DSRC similarly to the ETC.

The ACT transmitted from the on-board ETC device
Since the evaluation of the C data is performed based on whether or not the ACTC data is received in a time zone in which the AC data should be received, it is easy to distinguish the C data from noise or the like.

The ACT sent from the on-board ETC device
Since the evaluation of the C data is performed using the error detection code included in the ACTC data, the inspection can be performed simply and reliably.

The ACT transmitted from the ETC on-board unit
Since the evaluation of the C data is performed based on the identity of the FID in the FCMC data and the FID in the ACTC data, which is supposed to be the same, the inspection can be performed easily and reliably.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an ETC checker according to an embodiment of the present invention.

FIG. 2 is a diagram showing a data configuration according to the embodiment of the present invention.

FIG. 3 is a schematic diagram of an ETC system configuration.

FIG. 4 is a diagram showing a data configuration in a communication example of ETC.

[Explanation of symbols]

 Reference Signs List 10 ETC checker 11 ETC checker main body 12 System control unit 13 Display unit 14 Operation unit 15 External I / F unit 16 Data transmission / reception control unit 17 High frequency unit 18 Antenna unit 20 ETC on-board unit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Iida 5-1-1 Shimorenjaku, Mitaka-shi, Tokyo Japan Radio Co., Ltd. (72) Kenji Terada 5-1-1 Shimorenjaku, Mitaka-shi, Tokyo Japan Radio F term in the company (reference) 5K042 AA06 BA01 BA12 CA02 CA13 DA27 DA32 EA01 EA09 FA11 GA01 LA06

Claims (5)

[Claims] 1. A wireless signal in a data format that the reception responding device is to receive is transmitted to a reception response device mounted on a mobile body, and transmitted from the reception response device in response to the transmission. A checker for a reception responding device, which receives a radio signal, evaluates the received signal, and judges the acceptability of the receiving device based on the evaluation result. 2. A frame control message channel (FCMC) data is transmitted to an on-board unit for an automatic toll collection system (ETC) mounted on a vehicle, and transmitted from the on-board unit in response to the FCMC data. ET characterized in that it receives activation channel (ACTC) data, evaluates the received ACTC data, and determines the quality of the vehicle-mounted device based on the evaluation result.
C checker. 3. The ETC checker according to claim 2, wherein the evaluation is performed based on whether or not the ACTC data has been received in a time zone to be received. 4. The ETC checker according to claim 2, wherein the evaluation is performed using an error detection code in the ACTC data. 5. The ETC checker according to claim 2, wherein the evaluation is performed based on the identity of an identification number field (FID) in FCMC data and a FID in ACTC data.