JP3670304B2 - Information communication system - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an information communication system that wirelessly communicates information with a wireless card or the like carried by a moving body such as a vehicle on a toll road.
[0002]
[Prior art]
In recent years, for example, in a toll collection system on a toll road, various attempts have been made to exchange traffic data and collect tolls without contact with a staff member, and some have entered an operation test like an Italian telepass. On the other hand, in Japan, the operational conditions are severe due to the road conditions and so on, and it is still in the testing stage.
[0003]
There are two types of toll collection, a uniform section fee system and a distance fee system. Here, a more complicated distance fee system will be described. In general, a passing vehicle that represents entrance IC (interchange) data called a toll ticket at a toll gate at the toll road entrance, reads the ticket at the toll gate at the toll road exit, and exits from the toll road entrance Tolls are collected for tolls.
[0004]
In the contactless toll collection system, this traffic data is exchanged wirelessly, for example using a wireless card, wirelessly communicating with the toll gate at the entrance and exit, and cash settlement is the same as with account withdrawal or prepaid In advance, data (such as limit amount data) is input to the card and the data is withdrawn.
6 and 7 show a basic configuration of a toll collection system using a wireless system. A wireless card 71 in a vehicle 72 performs wireless communication with a communication control unit 74 via an antenna 73 installed at a toll gate. The fee collection data is exchanged with the fee collection device 75.
[0005]
FIG. 8 shows a wireless communication zone in this case. The wireless communication zone from the antenna 73 is shown in FIG. 8A, and the vehicle 72 holding the wireless card 71 enters this wireless communication zone. Communication is started. At this time, since the wireless card 71 in the vehicle 72 is in the reception level state of the wireless communication zone as shown in FIG. 8B, the wireless card 71 enters the strong electric field area while repeating reception and error from the weak electrolysis area. come.
[0006]
In such a reception level state, it is sufficient to use a strong electric field output in order to improve the stability of communication, but in this case, the directivity is widened, so that interference such as interference with vehicles around that amount Occurs.
[0007]
[Problems to be solved by the invention]
As described above, depending on the reception level state of the wireless communication zone from the antenna, the unstable communication area becomes a large and unstable communication, the reception and error are repeated, the wasteful processing time is long, and the wireless that the preceding and following vehicles hold There was a problem that interference such as interference with the card occurred.
SUMMARY OF THE INVENTION An object of the present invention is to provide an information communication system that can prevent crosstalk, secure a stable wireless communication area, and perform stable wireless communication.
[0009]
[Means for Solving the Problems]
The information communication system according to the present invention includes a first transmission unit for transmitting a first signal, a second transmission unit for transmitting a second signal, the second transmission unit, and the first transmission unit. The control means for performing the control of alternately transmitting the transmission of the first time, the first signal from the first transmission means and the second signal from the second transmission means transmitted alternately by the control means Receiving means for receiving the first signal, detection means for detecting the received voltage of the first signal and the second signal received by the receiving means, and the received voltage of the first signal detected by the detecting means. And a comparison means for comparing whether or not the reception voltage of the second signal is greater than a predetermined value, and the comparison result of the comparison means, the reception voltage of the first signal and the reception voltage of the second signal And responding means for responding when the value is greater than a predetermined value, In and a sensitivity control means for increasing the reception sensitivity of the receiving means when the response.
[0010]
The information communication system according to the present invention, when receiving a plurality of identification signals, outputs a response signal to start communication, and transmits a plurality of identification signals to the portable information storage medium, A plurality of transmission means provided for each identification signal, and a reception means for receiving a response signal output when the plurality of identification signals transmitted from the plurality of transmission means are received by the portable information storage medium And communication means for communicating data with the portable information storage medium according to the response signal received by the receiving means.
[0011]
The information communication system according to the present invention includes a first transmission unit for transmitting a first identification signal, a second transmission unit for transmitting a second identification signal, the second transmission unit, and the first transmission. From the control means for performing the control to alternately transmit the transmission with the means in time division, the first identification signal from the first transmission means and the second transmission means transmitted alternately by the control means Receiving means for receiving the second identification signal, generating means for generating identification information from the first identification signal and the second identification signal received by the receiving means, and generated by the generating means Collation means for collating whether or not the identification information and predetermined identification information match, and detection means for detecting the received voltages of the first identification signal and the second identification signal received by the receiving means; The received voltage of the first identification signal detected by this detecting means A comparison means for comparing whether or not the reception voltage of the identification signal of 2 is greater than a predetermined value, and a comparison result of the comparison means, the reception voltage of the first signal and the reception voltage of the second signal Is larger than a predetermined value, and output means for outputting a response signal when the identification information matches as a result of collation by the collation means.
[0012]
[Action]
In the present invention, the first signal is transmitted by the first transmission means, the second signal is transmitted by the second transmission means, and the transmission between the second transmission means and the first transmission means is time-divisionally performed. Are transmitted alternately, the first signal and the second signal transmitted alternately are received, the reception levels of the received first signal and second signal are detected, and the detected first signal is detected. The reception level of the first signal and the reception level of the second signal are compared with a predetermined value, and the reception level of the first signal and the reception level of the second signal are determined based on the predetermined value. It responds when it is large.
[0013]
In the present invention, the first identification signal is transmitted by the first transmission means, the second identification signal is transmitted by the second transmission means, and the transmission between the second transmission means and the first transmission means is sometimes performed. The first identification signal and the second identification signal transmitted alternately are divided and transmitted alternately, and the reception means receives the first identification signal and the second identification signal, and from the received first identification signal and second identification signal The identification information is generated, the collation means collates whether or not the generated identification information matches the predetermined identification information, and the first identification signal and the second identification signal received by the reception means The received voltage of the first identification signal is compared with whether or not the received voltage of the detected first identification signal and the received voltage of the second identification signal are larger than a predetermined value. The received voltage of the second signal is greater than a predetermined value, and the identification information matches in the verification means It is obtained so as to output a response signal to the multiplexer.
[0014]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a schematic configuration of a multi-beam type toll collection system on a toll road as an information communication system of the present invention. That is, this wireless toll collection system is provided at a toll road toll gate, a toll collector 1 for toll collection, a communication control device 2 for controlling transmission and reception communication, and a transmission from the communication control device 2 , An antenna 3 used for reception, a transmission device 4 connected to the communication control device 2, an antenna 5 used for transmission from the transmission device 4, a wireless card held by a vehicle entering a toll road (or similar) And a portable information storage medium 6 as a wireless device.
[0015]
The communication control device 2 includes a control unit 21 that performs overall control, a modulation unit 22 that modulates data from the control unit 21, a transmission unit 23 that transmits a data modulation signal from the modulation unit 22, and a wireless card via the antenna 3. 6 includes a receiving unit 25 that receives the data modulated signal from the receiving unit 6, a demodulating unit 24 that demodulates the data modulated signal received by the receiving unit 25, and a time measuring unit 26.
[0016]
The transmission device 4 is connected to the control unit 21 of the communication control device 2 and includes a modulation unit 41 that modulates data from the control unit 21 and a transmission unit 42 that transmits a data modulation signal from the modulation unit 41. .
The wireless card 6 is received by the control unit 62 that controls the entire control, the antenna unit 62 that receives and transmits the data modulation signal, the demodulation unit 64 that demodulates the data modulation signal received by the antenna unit 62, and the antenna unit 62. An A / D conversion unit 65 for checking the reception level, a modulation unit 63 that modulates data from the control unit 62, a storage unit 66 that is connected to the control unit 62 and stores data such as toll collection, a power supply 67, and The timer unit 68 is configured.
[0017]
FIG. 2 shows a configuration example of a wireless communication zone using the antennas 3 and 5 having different directivities and directions in this embodiment. In FIG. 2A, the antenna 3 is arranged at the upper right side of the passing road. The antenna 5 is arranged at the center upper part of the passing road, and the wireless communication zone (in FIG. 2) is sharper than when the antenna 3 and the wireless communication zone of the antenna 5 are crossed and a single antenna is used. (Shaded portion) can be configured. Here, the antenna 5 has a slightly wider directivity than the antenna 5 for the purpose of narrowing the wireless communication zone and the antenna 3 for the purpose of improving reception stability.
In FIG. 2B, the reception level state of the wireless communication zone from the antenna 3 is indicated by a solid line, and the reception level state of the wireless communication zone from the antenna 5 is indicated by a dotted line.
[0018]
Next, the reception level check of the wireless card 6 in the multi-beam system of the present invention will be described with reference to FIG. The multi-beam method is configured by an antenna having a plurality of directivities, and starts communication in the overlapping communication area. In other words, in this embodiment, the antenna 3 is used for stabilizing communication and the antenna 5 for limiting communication area.
[0019]
First, until the wireless card 6 enters the wireless communication zone, the control unit 21 outputs the activation code A1 signal from the antenna 3 and the activation code A2 signal from the antenna 5.
The wireless card 6 is set in advance in the control unit 61 so as to receive the reception process start condition in the order of the activation code A1 signal and then the activation code A2 signal. Since the wireless card 6 is set in this way, the wireless card 6 responds when it receives a portion where the two directivities of the antenna 3 and the antenna 5 overlap, that is, the activation code A1 and the activation code A2.
[0020]
Further, the wireless card 6 is also checked for reception level in order to obtain stable communication. When the antenna unit 62 receives the activation code A1 signal and the activation code A2 signal, the control unit 61 checks the reception level via the A / D conversion unit 65, and both the activation code A1 signal and the activation code A2 signal have a threshold value S1. If not, no response is made, and both signals respond when the threshold value S1 is reached. Further, after this response, the threshold value S1 is changed to the threshold value S2 that is lowered in order to stabilize the communication.
[0021]
That is, the wireless card 6 held by the vehicle 8 in FIG. 2 receives the activation code A1 signal from the antenna 3 at the position l1 when entering the wireless communication zone (moving from right to left in FIG. 2). Since the activation code A2 signal from the antenna 5 is not received, there is no response.
When the wireless card 6 moves to the position l2, it receives both the activation code A1 signal from the antenna 3 and the activation code A2 signal from the antenna 5, but does not respond because the reception level of the activation code A2 signal is low.
[0022]
When the wireless card 6 moves to the position l0, both the activation code A1 signal from the antenna 3 and the activation code A2 signal from the antenna 5 are received. Since both signals have a reception level equal to or higher than the threshold S1, a response signal is returned. Communication processing is started.
In such a configuration, a toll collection data communication operation using the antenna 3 for stabilizing communication and the antenna 5 for limiting communication area will be described with reference to FIGS.
[0023]
First, until the wireless card 6 enters the wireless communication zone, the control unit 21 transmits an activation code A1 signal (hereinafter referred to as command A1) from the antenna 3 and an activation code A2 signal (hereinafter referred to as command A2) from the antenna 5. Are output in a time-sharing manner using the time measuring unit 26 alternately. After transmitting through the antennas 3 and 5, the control unit 21 waits for a reply from the wireless card 6 for a certain time using the time measuring unit 26, and repeats again if there is no response.
[0024]
In the wireless card 6, the reception processing start conditions are set in advance in the control unit 61 so as to be received within a predetermined time using the time measuring unit 68 in the order of the command A1 and then the command A2 in advance. 61 responds when the codes generated from the command A1 and the command A2 match with the codes set in the storage unit 65 in advance.
[0025]
Setting code = F (A1, A2)
Since F () is set in this way in the function wireless card 6 defined in advance, the command A2 is received at the portion where the two directivities of the antenna 3 and the antenna 5 overlap, that is, the command A1. Respond when
[0026]
Furthermore, in order to obtain stable communication, the wireless card 6 also checks the reception level as described above. The control unit 61 checks the reception voltage via the A / D conversion unit 65 when the antenna unit 62 receives the command A1 and the command A2, and both the command A1 and the command A2 receive the reception voltage V1 (corresponding to the threshold value S1). If the signal does not reach, no response is made and both signals respond when the reception voltage V1 is reached. After this response, the reception voltage is changed from V1 to V2 (corresponding to the threshold value S2) in order to stabilize communication.
[0027]
In addition, individual ID identification data is stored in the storage unit 65 in the wireless card 6, and thereafter, the wireless card 6 can be individually separated by this ID identification data for communication. If the first ID identification data can be communicated stably and in a limited area, thereafter, stable communication can be performed in the wide directivity wireless communication zone of the communication stabilizing antenna 3 by using the ID identification data.
[0028]
That is, the wireless card 6 held by the vehicle 8 entering the wireless communication zone of the antenna 3 and the antenna 5 activates the control unit 61 when receiving a signal, and checks the received signal. The controller 61 first checks whether the command A1 is received. If the command A1 is received, the controller 61 checks whether the received voltage is V1 or higher via the A / D converter 65. If the reception voltage is equal to or higher than V1, the reception of the next command A2 is waited for a predetermined time. If the command A2 is not received within a certain time, the process returns to the reception check of the first command A1.
[0029]
When the command A2 is received within a predetermined time, the control unit 61 checks whether the reception voltage is V1 or higher. If the command A2 is higher than V1, the control unit 61 determines that the communication range is stable and determines the reception check voltage from V1. Lower to V2 and start communication.
Although the example of starting communication by controlling the reception voltage has been described here, the reception sensitivity (or AGC capability) is first reduced, and the sensitivity (or AGC capability) is increased when it is determined as the communication range. In this way, communication may be stabilized. Further, when communication is started, the stability of communication may be improved by increasing sensitivity (or AGC capability) for communication stability.
[0030]
The control unit 61 of the wireless card 6 transmits the ID identification code and unique data via the modulation unit 63 and the antenna unit 62, and receives the data request signal via the antenna 3 by the communication control device 2. Transmit via the antenna 3.
The control unit 61 of the wireless card 6 reads the billing data from the storage unit 66 and transmits it in response to the data request.
[0031]
The fee collector 1 performs fee processing based on the charging data received via the antenna 3 and the communication control device 2 and transmits the processing result via the communication control device 2 and the antenna 3.
The control unit 61 of the wireless card 6 receives the processing result, stores it in the storage unit 66, transmits an end command, and ends the processing.
[0032]
The communication control device 2 receives the end command via the antenna 3 and sends a completion command to the toll collector 1, and the toll collector 1 completes the processing.
Subsequently, the control unit 21 of the communication control device 2 outputs the command A1 from the antenna 3 and the command A2 from the antenna 5 alternately using the time measuring unit 26 in a time division manner.
As described above, according to the above-described embodiment, in addition to the narrow directivity of the multi-beam method using antennas having different communication areas, the reception level of the wireless card is also checked for each reception code, and a fixed level is obtained. It is possible to ensure communication stability by responding with the above strong electric field and then responding with high sensitivity. Thereby, it is possible to perform toll collection communication by a stable wireless method even when using a single frequency band.
[0033]
【The invention's effect】
As described above in detail, according to the present invention, it is possible to provide an information communication system capable of preventing interference and securing a stable wireless communication area and performing stable wireless communication.
[Brief description of the drawings]
FIG. 1 is a block diagram schematically showing a configuration of a wireless fee collection system according to an embodiment of the present invention;
FIG. 2 is a diagram for explaining a configuration of a wireless communication zone of two antennas having different directivities and directions.
FIG. 3 is a diagram for explaining a reception level check of a wireless card in a multi-beam method.
FIG. 4 is a flowchart for explaining an activation operation of two antennas and a wireless card.
FIG. 5 is a diagram for explaining a toll collection operation in the multi-beam method.
FIG. 6 is a diagram schematically showing a basic configuration of a conventional toll collection system using a wireless system.
FIG. 7 is a diagram schematically showing a basic configuration of a conventional toll collection system using a wireless system.
FIG. 8 is a diagram showing a wireless communication zone and a reception level according to a conventional wireless system.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Charge receiver 2 ... Communication control apparatus 3, 5 ... Antenna 4 ... Transmission apparatus 6 ... Wireless card 8 ... Vehicle 21, 61 ... Control part 26, 68 ... Time measuring part 65 ... A / D conversion part 66 ... Memory | storage part

Claims (3)

First transmission means for transmitting a first signal;
Second transmitting means for transmitting a second signal;
Control means for controlling the transmission of the second transmission means and the first transmission means to be alternately transmitted in a time-sharing manner;
Receiving means for receiving the first signal from the first transmitting means and the second signal from the second transmitting means, which are alternately transmitted by the control means;
Detecting means for detecting received voltages of the first signal and the second signal received by the receiving means;
A comparison means for comparing whether or not the reception voltage of the first signal detected by the detection means and the reception voltage of the second signal are larger than a predetermined value;
A response means for responding when the reception voltage of the first signal and the reception voltage of the second signal are larger than a predetermined value as a result of comparison by the comparison means;
Sensitivity control means for increasing the receiving sensitivity of the receiving means when responding with the response means;
An information communication system comprising: A portable information storage medium that outputs a response signal and starts communication when receiving a plurality of identification signals;
Transmitting a plurality of identification signals to the portable information storage medium, a plurality of transmission means provided for each identification signal;
Receiving means for receiving response signals output when the plurality of identification signals transmitted from the plurality of transmitting means are received by the portable information storage medium;
Communication means for communicating data with the portable information storage medium in response to the response signal received by the receiving means;
An information communication system comprising: First transmitting means for transmitting a first identification signal;
Second transmitting means for transmitting a second identification signal;
Control means for controlling the transmission of the second transmission means and the first transmission means to be alternately transmitted in a time-sharing manner;
Receiving means for receiving the first identification signal from the first transmission means and the second identification signal from the second transmission means, which are alternately transmitted by the control means;
Generating means for generating identification information from the first identification signal and the second identification signal received by the receiving means;
Collation means for collating whether or not the identification information generated by the generation means matches the predetermined identification information;
Detecting means for detecting the reception voltages of the first identification signal and the second identification signal received by the receiving means;
A comparison means for comparing whether or not the reception voltage of the first identification signal detected by the detection means and the reception voltage of the second identification signal are larger than a predetermined value;
As a result of the comparison by the comparison means, the reception voltage of the first signal and the reception voltage of the second signal are larger than a predetermined value, and the identification information matches as a result of comparison by the comparison means. Output means for outputting a response signal in case,
An information communication system comprising:

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