JP3730099B2 - Vehicle information polling system in automatic vehicle position display system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle information polling method in an automatic vehicle position display system in which a wireless service area is covered by a plurality of base stations.
[0002]
[Prior art]
For example, in order to be able to arrange vehicles efficiently in a taxi company, etc., status information (empty car, rent, surcharge, etc.) and position information of a plurality of vehicles located within a predetermined service area, etc. Vehicle position display system that collects the vehicle information to the dispatching center and displays the collected vehicle information in an appropriate form on the dispatching center display device via a radiotelephone device mounted on the vehicle (Hereinafter referred to as an AVM system).
[0003]
In the AVM system, in order to collect desired vehicle information such as state information and position information of all vehicles, a call signal is periodically transmitted from the base station, and each vehicle is determined at a timing uniquely determined by the vehicle number. Is polling to respond to this. By the way, when the service area is large, it is often difficult to collect necessary vehicle information for all vehicles with only one base station. In such a case, a predetermined service area is covered by a plurality of base stations. The structure to be adopted is adopted.
[0004]
Referring to FIG. 8, a conventional polling method in which a wide service area is covered by a plurality of base stations will be described. The base station A covers a first service area a that is approximately ½ of all service areas, The base station B covers the remaining approximately half of the second service area b of all the service areas, but the first service area a and the second service area b overlap, resulting in an overlapping service area c. Yes. Therefore, if the base stations A and B simultaneously emit polling signals, the vehicle (mobile station) in the overlapping service area c will interfere with communication due to mutual interference due to simultaneous reception of two radio waves of the same frequency. And reliable communication becomes difficult.
[0005]
Therefore, the information processing devices A1 and B1 of the base stations A and B have a time management function, the polling radio wave emission times of the base stations A and B are shifted, and the polling radio wave is first emitted from the base station A. After collecting vehicle information from each mobile station in the first service area a, a polling radio wave is emitted from the base station B to collect vehicle information from each mobile station in the second service area b. Yes.
[0006]
More specifically, in the base station A, when the designated polling time is reached or a manual polling instruction is received and a polling start instruction is issued from the information processing apparatus A1 to the radio transceiver A2, the radio transceiver First, A2 transmits a group number (usually from 00) including hundreds and tens digits of the vehicle number to be responded. The vehicle that has received this signal determines whether or not it should respond from its own set number and the received group number. The vehicle that should respond in the first service area a transmits after waiting for the digit of the vehicle number × t seconds (t is the data transmission time for one vehicle) from the end of the reception of the group number from the base station A. . As a result, polling for ten vehicles can be performed without time overlap.
[0007]
The base station A can further collect the vehicle information of all the vehicles in the first service area a by repeating the process of collecting the vehicle information by transmitting the next group number as many times as necessary.
[0008]
In this way, when polling of each vehicle in the first service area a by the base station A is completed, for example, information on the base station B is transmitted from the information processing apparatus A1 of the base station A via a modem (not shown). A polling start instruction is issued to the processing device B1, and thereby the vehicle information collection for each vehicle in the second service area b is performed by the radio transceiver B2 of the base station B in the same process as that of the base station A described above. Polling is performed. The vehicle information collected at the base station B is sent to the base station A via a modem (not shown). The time required for polling is (base station transmission time [t] + 10 × transmission time per vehicle [t]) × number of groups × 2, and 10 groups is 220 t (seconds).
[0009]
According to the above method, vehicles in the overlapping service area c can receive radio waves for polling without radio wave interference in response to polling of the base station A and / or base station B. Necessary information can be reliably collected from all vehicles.
[0010]
[Problems to be solved by the invention]
According to the above-described conventional polling method, it is possible to avoid the problem of interference in vehicles in the overlapping service area c and reliably collect vehicle information from all vehicles, but it is necessary to transmit the same information multiple times. Therefore, naturally, it takes time to transmit information for polling. By the way, in the dispatch center, a voice call is frequently made in which a vehicle closest to the customer is confirmed on a display device and an instruction is given to the vehicle by voice via a wireless telephone device. Calls and vehicle information collection often use the same radio frequency, and voice calls cannot be made while vehicle information collection is being performed by polling. For this reason, the conventional polling method described above has a problem that the voice call time for dispatch using the AVM system is greatly restricted, and the dispatch service is lowered. Also, if the polling time interval is lengthened to solve this problem, the accurate current position and situation of all the vehicles will be inadequate, and it will not be possible to give an accurate dispatch instruction and the dispatching effect will be reduced. This will cause problems.
[0011]
An object of the present invention is to provide a vehicle information polling method in an automatic vehicle position display system that can solve the above-mentioned problems in the prior art.
[0012]
[Means for Solving the Problems]
A feature of the present invention for solving the above-described problem is that a plurality of base stations cover a wireless service area with a plurality of base stations, and a plurality of vehicles moving within the wireless service area are divided into a plurality of vehicle groups. By transmitting a group number for identifying any one of the plurality of vehicle groups from the station, required vehicle information from each vehicle belonging to the vehicle group identified by the group number is transmitted to each vehicle. In the vehicle information polling method in the automatic vehicle position display system that collects via the mounted radio and displays the vehicle position based on the collected information, the group number from each of the plurality of base stations Sequentially transmits a group polling signal with base station information for distinguishing the transmitting base station, For each vehicle belonging to the vehicle group specified by the group number, the time for the vehicle's response based on the vehicle number assigned in advance and the base station information added to the received group polling signal An automatic vehicle position display characterized in that a slot is determined so as not to overlap with a time slot for a response from another vehicle, and vehicle information of the own vehicle is transmitted within the determined time slot. A vehicle information polling system in the system is proposed.
[0013]
By sequentially transmitting a group polling signal from each base station, a vehicle in the wireless service area can receive at least a group polling signal from any one base station without interference. Here, in order to shorten the time required for polling, it is preferable to transmit the group polling signal continuously without a time interval.
[0014]
The group polling signal includes a group number for identifying the vehicle group to be responded to, and each vehicle has a vehicle number assigned in advance and a group number included in the received group polling signal. It is possible to determine whether or not a response from the own vehicle is requested. In each vehicle for which a response is requested, the vehicle information of the own vehicle is transmitted within the time slot determined for the response, so that the vehicle information is transmitted from each vehicle without time overlap. Received at at least one of the base stations.
[0015]
The transmission of the group polling signal and the transmission of the vehicle information in response thereto are sequentially executed in the same manner for each of the vehicle groups, and the vehicle information for all the vehicles can be obtained by being executed for all the number of vehicle groups. .
[0016]
Since the moving state of the vehicle is various, a certain vehicle cannot always receive group polling signals from all base stations. However, the number of group polling signals emitted for one polling is known in advance. Therefore, if a group polling signal from any one base station can be received, the base station information included in the group polling signal is received. Therefore, the time slot for the response of each vehicle to be responded at that time can be determined by simple calculation, and the vehicle information can be transmitted using the determined time slot. As a result, each vehicle information from a plurality of vehicles for which a response is requested by the group polling signal can be received without interference at at least one of the base stations.
[0017]
A serial number from 1 is assigned to all the vehicles as a vehicle number, and the group number can be a number including a hundred and ten digits of the vehicle number to be responded. Thereby, the time slot for a response in each vehicle can be determined by simple calculation using the vehicle number. Since the group polling signal needs to be sequentially transmitted from each base station without overlapping as described above, it is necessary to synchronize for this purpose in each base station. For this reason, it can be set as the structure which connects between base stations by a cable or radio | wireless, and takes this synchronization.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings.
[0019]
FIG. 1 collects vehicle information necessary for dispatching vehicles using a vehicle information polling system according to the present invention via a radio device mounted on each vehicle, and automatically displays the position of the vehicle in the service area. It is a schematic system diagram of the AVM system 1 made. In the AVM system 1, the entire radio service area is divided into a first service area A1 serviced by the first base station 2 and a second service area A2 serviced by the second base station 3, and the first service area An overlapping service area A3 that can be served by both the first base station 2 and the second base station 3 is formed between A1 and the second service area A2.
[0020]
In the first base station 2, 2A is a wireless transmitter / receiver connected to the antenna 2B, and can perform voice communication with a wireless device mounted on each vehicle using a microphone / speaker 2C. In addition, the vehicle includes status information indicating the status of the vehicle, such as an empty vehicle, renting, and surcharge, and position information indicating the position of the vehicle detected by the GPS position detection device configured in the vehicle. Used to poll information. 2D performs polling control for collecting vehicle information, and information processing for performing various controls and data processing for automatically displaying the positions of all vehicles on the display device 2E based on the collected vehicle information. Device. 2F is a modem and 2G is a remote control device. The information processing apparatus 2D is connected to the second base station 3 via the telephone line L1 by the modem 2E.
[0021]
The second base station 3 includes a radio transceiver 3A, an antenna 3B, a modem 3C, and a remote control device 3D connected as shown in the figure. The modem 3C is connected to the modem 2F via the telephone line L1, and the remote control device 3D is connected to the remote control device 2G via another telephone line L2, whereby the first base station 2 and the second base station 3 are connected to each other. Necessary information can be exchanged between the first base station 2 and the second base station 3 can be remotely controlled by the first base station 2.
[0022]
Since the radio wave from the antenna 2B of the first base station 2 reaches the first service area A1, a voice call using the microphone / speaker 2C can be performed with the vehicles M1 and M2 in the first service area A1. Of course, voice communication can also be performed with the vehicle M3 in the overlapping service area A3. The microphone / speaker 2C can be connected to the remote control device 3D of the second base station 3 via the remote control device 2G, and further connected to the wireless transceiver 3A via the remote control device 3D. Therefore, a voice call can be made with the vehicles M4 and M5 in the second service area A2 by the wireless transceiver 3A using the microphone / speaker 2C. In this case, the radio wave from the antenna 3B reaches the vehicle M3 in the overlapping service area A3, so that the vehicle M3 can make a voice call with the second base station 3.
[0023]
FIG. 2 is a detailed block diagram showing a detailed configuration of the wireless transceiver 2A shown in FIG. In FIG. 2, 2A1 is a high frequency unit, 2A2 is a PLL unit, 2A3 is a low frequency unit, 2A4 is a TSQ unit, and 2A5 is a modem unit. The CPU unit 2A6 is configured as a microcomputer system, whereby a frequency control unit 2A7, a tone control unit 2A8, a data communication unit 2A9, a low frequency control unit 2A10, an external communication unit 2A11, an AVM control unit 2A12, and a general control. Part 2A13 is configured. The external communication unit 2A11 can communicate with an external device via the RS-232 transmission / reception unit 2A14. 2A15 is an EPROM for storing necessary control programs and data, and 2A16 is a power supply monitoring unit.
[0024]
As described above, the wireless transceiver 2A is configured to be able to perform data communication by the CPU unit 2A6 in addition to voice communication by the microphone / speaker 2C connected to the low frequency unit 2A3, and collect vehicle information. The polling operation is executed as described later in accordance with a program stored in the memory unit 2A17.
[0025]
The radio equipment mounted on each vehicle is basically the same as the configuration shown in FIG. 2 and can perform voice communication and data communication. However, in the case of the radio equipment mounted on each vehicle Has a GPS function for obtaining position data of the own vehicle and a status data output function indicating whether the own vehicle is empty, rented, or surcharged. Vehicle information related to the vehicle can be transmitted in a predetermined data format. Since the configuration of the vehicular radio itself having a function of transmitting position data and status data as vehicle information in a predetermined data format is known, detailed description thereof will be omitted.
[0026]
Next, in the AVM system 1 configured as described above, a polling operation for collecting vehicle information from each vehicle will be described with reference to FIGS. 3 is a flowchart showing a polling control program 20 for polling control executed in the information processing apparatus 2D of the first base station 2, and FIG. 4 is executed in the CPU unit 2A6 of the radio transceiver 2A of the first base station 2. 5 is a flowchart showing a communication control program 30 for polling, FIG. 5 is a flowchart showing a communication control program 40 for polling executed in the CPU section of the wireless transceiver 3A of the second base station 3, and FIG. It is a flowchart which shows the communication control program 50 in the vehicle side for the polling performed by the CPU part of the mounted radio | wireless machine.
[0027]
First, when execution of the polling control program 20 is started in the information processing apparatus 2D, it is determined in step 21 whether or not a predetermined time has elapsed. If the predetermined time has not elapsed, the determination result of step 21 is NO, and it is determined in step 22 whether or not the start of polling by manual operation has been instructed. If the start of polling by manual operation is not instructed, the determination result of step 22 is NO and the process returns to step 21. Therefore, when a predetermined time has elapsed and the determination result of step 21 is YES, or when a manual operation is executed and the determination result of step 22 is YES, step 23 is executed and a polling instruction is issued.
[0028]
The communication control program 30 determines whether or not polling has been started in step 31. When the polling instruction output in step 23 is issued, the determination result in step 31 is YES, and the polling group signal is determined in step 32. Send. The AVM system 1 assigns vehicle numbers in order from 001 to the vehicles M1, M2, M3,... Moving in the wireless service area using a three-digit serial number. It is divided into vehicle groups. Then, by transmitting a group number for identifying a vehicle group from the first base station 2 and the second base station 3, required vehicle information is transmitted to each vehicle from each vehicle belonging to the vehicle group corresponding to this group number. It is configured to collect via the onboard radio. That is, it is a polling method for collecting vehicle information for each vehicle group.
[0029]
For this reason, the polling group signal includes a group number indicating the vehicle group to be polled at that time, and further includes a base station number indicating the base station that transmitted the polling group signal. In the present embodiment, numbers 00, 01,... Including the hundred and ten digits of the vehicle numbers to be responded are used as group numbers, whereby 10 vehicles are set as one vehicle group.
[0030]
In the polling control program 20, when a polling instruction is output in step 23, in step 24, the polling instruction is also sent to the wireless transceiver 3A via the modems 2F and 3C.
[0031]
As a result, the determination result of polling start in step 41 of the communication control program 40 is YES, and a polling group signal is transmitted from the second base station 3 in step 43. The transmission of the polling group signal here is the same as that described in step 32 except that the base station number of the second base station 3 is assigned. In step 42, it is checked whether or not the polling group signal transmitted from the first base station 2 is received. If the polling group signal transmitted from the first base station 2 is received, step 42 is performed. The determination result is YES, and step 43 is executed. That is, if the determination result is YES in any of steps 41 and 42, step 43 is executed.
[0032]
FIG. 7 shows the transmission timing of the polling group signal P1 from the first base station 2 and the transmission timing of the polling group signal P2 from the second base station 3. As shown in FIG. 7, at the polling instruction timing TA in step 23, the polling group signal P1 is transmitted for the time t. Then, the polling group signal P2 is transmitted for the time t at the timing TB when the transmission of the polling group signal P1 is completed. This transmission timing control is performed in step 24. In this way, the polling group signal P1 and the polling group signal P2 are sequentially and sequentially transmitted so as not to overlap in time.
[0033]
Next, with reference to FIG. 6, the operation of the radio mounted on the vehicle that has received the polling group signal will be described. In step 51, it is checked whether or not the polling group signal P1 transmitted from the first base station 2 has been received. If the polling group signal P1 has not been received, the determination result in step 51 is NO. At 52, it is determined whether or not the polling group signal P2 transmitted from the second base station 3 has been received. If the polling group signal P2 is not received, the determination result of step 52 is NO, and the process returns to step 51.
[0034]
When polling group signal P1 is received by the vehicle radio, the determination result in step 51 is YES, and step 53 is entered. On the other hand, if the polling group signal P2 is received, the determination result in step 52 is YES, and step 53 is entered. That is, if either the polling group signal P1 or the polling group signal P2 is received, step 53 is executed.
[0035]
In step 53, based on the group number included in the polling group signal P1 or the polling group signal P2 and the vehicle number of the host vehicle, it is determined whether or not the host vehicle should respond to the current polling. If it is determined that a response should not be made, the determination result of step 53 is NO and the process returns to step 51. On the other hand, if it is determined that a response should be made, the routine proceeds to step 54 where the transmission timing is adjusted. This timing is a timing TC at which the transmission of the group number from the second base station 3 is completed.
[0036]
That is, the polling group signal P1 and the polling group signal P2 are not always received by traveling of the vehicle, and in most cases, only one of them can be received. However, as can be seen from FIG. 7, the timing TC can be easily determined if either one of the polling group signal P1 and the polling group signal P2 can be received.
[0037]
In step 55, transmission is waited for t times the digit of the first digit of the vehicle number (t is a predetermined number of seconds) from the timing TC adjusted in step 54. Vehicle information is transmitted, and the process returns to step 51.
[0038]
That is, in the vehicle, when a polling group signal is received from either the first base station 2 or the second base station 3, it is determined whether or not the own vehicle should respond. If it is determined that a response should be made, the time slot for transmitting the own vehicle is determined by executing steps 54 and 55, and the vehicle information of the own vehicle is transmitted.
[0039]
Although only one vehicle has been described above, the same applies to other vehicles in the wireless service area. Accordingly, the ten vehicles to be responded transmit the vehicle information of each vehicle in the time slot assigned to each of them, so that the vehicle information for the ten vehicles does not overlap each other in time. Sent from each vehicle.
[0040]
FIG. 7 shows the transmission timing of the vehicle information V1 to V10 from the ten vehicles designated by the group number after the transmission of the polling group signal P1 and the polling group signal P2. As shown in FIG. 7, after t seconds have elapsed from the timing TC adjusted in step 54, ten time slots for t seconds are continuously set, and vehicle information V1 to V10 are transmitted in these time slots, respectively. Is done.
[0041]
Thus, the vehicle information V1 to V10 transmitted from 10 vehicles is received and processed in the first base station 2 and / or the second base station 3.
[0042]
This will be described in detail. When the first base station 2 receives the vehicle information transmitted as shown in FIG. 7 in step 33, the first base station 2 sends the received data to the information processing apparatus 2D and enters step 34. In step 34, it is determined whether or not the reception time for 10 vehicles has elapsed. If the 10 vehicles have not been received, the determination result in step 34 is NO, and the process returns to step 33 to receive vehicle information. When the vehicle information for 10 vehicles can be received in this way, the determination result in step 34 is YES, and it is determined in step 35 whether polling has been completed for all the vehicles. In the above example, since only 10 vehicles have been completed, the determination result in step 35 is NO, the process returns to step 32, and the next group number (01) is transmitted. If polling is performed for all the vehicles, the determination result in step 35 is YES, and step 36 is entered. Here, the information processing apparatus 2D is notified that the polling has ended, Return to 31.
[0043]
Next, reception processing in the radio transceiver 3A of the second base station 3 will be described. When vehicle information from any of the vehicles is received at step 44, the received vehicle information is sent to the information processing device 2D via the modems 3C and 2F at step 45, and step 46 is entered.
[0044]
In step 46, it is determined whether or not the reception time for 10 vehicles has elapsed. If the 10 vehicles have not been received, the determination result in step 46 is NO, and the process returns to step 44 to receive vehicle information. If reception for 10 vehicles is thus possible, the determination result in step 46 is YES, and it is determined in step 47 whether polling has been completed for all vehicles. In the above example, since only 10 units are completed, the determination result in step 47 is NO, and step 48 is entered. Here, after waiting for the transmission time of the first base station 2, the process returns to step 43, where The group number (01) is transmitted.
[0045]
In this way, when polling has been performed for all the vehicles, the determination result in step 47 is YES, and step 49 is entered, where a report to the effect that polling has ended is sent to the information processing apparatus 2D. Return to step 41.
[0046]
Next, processing in the information processing apparatus 2D for vehicle information from each vehicle received at the first base station 2 and the second base station 3 as described above will be described with reference to FIG. In step 25, the vehicle information received by the radio transceiver 2A of the first base station 2 is acquired, and in the next step 26, the vehicle information received by the second base station 3 is acquired.
[0047]
Thereafter, in step 27, it is determined whether or not polling in the first base station 2 has been completed. This determination is made for the polling end report in step 36. If the polling of the first base station 2 has not ended, the determination result in step 27 is NO, and the process returns to step 25 to acquire vehicle information. If polling is completed, the determination result in step 27 is YES and step 28 is entered.
[0048]
Next, in step 28, it is determined whether or not polling in the second base station 3 has been completed. This determination is made based on the polling end report in step 49. If the polling of the second base station 3 has not ended, the determination result in step 28 is NO, and the process returns to step 26 to acquire vehicle information. If polling is completed, the determination result in step 28 is YES, and the process returns to step 21.
[0049]
As described above, the wide wireless service area is divided into the first service area A1 and the second service area A2, and is covered by the first base station 2 and the second base station 3, and moves within the wireless service area. The vehicle information necessary for dispatching is collected for each of the plurality of vehicles M1, M2,... As described above via the radio mounted on each vehicle, and the collected vehicle information is collected. Processing is performed in the information processing device 2D, and the position of the vehicle can be automatically displayed on the display device 2E based on each processing result.
[0050]
In this case, in order to avoid interference of polling signals in the overlapping service area A3, the polling group signals P1 and P2 are sequentially shifted from the first base station 2 and the second base station 3 so as not to overlap. And at least one of these can be received without causing interference problems in the vehicle. On the vehicle side, the transmission timing only for the own vehicle determined by the number of the first digit of the vehicle number of the own vehicle is calculated based on the reception timing of the polling group signal, and the time slot determined by this calculation is calculated. In the configuration, vehicle information is transmitted.
[0051]
Therefore, the first base station 2 and the second base station 3 sequentially receive 10 pieces of vehicle information from each vehicle after the transmission of the polling group signal is completed, and the first base station 2 and the second base station 3 all receive the vehicle information. Vehicle information for 10 specific vehicles among the vehicles in the wireless area can be collected. The time required for polling in this case is calculated in the example of FIG. 7, and (base station transmission time [t] × 2 + 10 × transmission time per vehicle [t]) × number of groups is 120 t for 10 groups. (Seconds). [Comparison of polling required time] is as follows. The polling required time when there is one base station is (base station transmission time [t] + 10 × transmission time per vehicle) × number of groups, and in the case of 10 groups, it is 110 t (seconds). On the other hand, the conventional method with two base stations requires 220 t (seconds), which is twice as much as that, but the improved method is 120 t (seconds), an increase of just over 9%. Become. If the number of base stations increases to three or four, the shortening effect becomes even greater.
[0052]
【The invention's effect】
According to the present invention, as described above, when vehicle information is collected from a plurality of vehicles designated by specifying a group number from a plurality of base stations, a polling group signal is received from each base station. The base station information is attached so that it can be identified on the side, and once transmitted sequentially, the vehicle side receives the polling group signal, determines the time slot to respond, and each group-designated vehicle has no duplicate transmission Each vehicle can receive the polling group signal without any problem of interference, and thus receives the polling group signal from at least one base station. If possible, a time slot for transmitting vehicle information is determined, and the vehicle information from each vehicle belonging to the specified vehicle group is shifted in time. It may be transmitted sequentially efficiently Te. As a result, vehicle information can be collected in a relatively short time without causing the problem of interference in polling from a plurality of base stations using the same frequency. Therefore, even if the vehicle communication wireless communication device is shared for voice calls and data collection, the call time for vehicle arrangement is not greatly limited, so that the vehicle dispatch service can be performed without problems. In addition, vehicle information can be collected at high speeds in this way, so that the polling time interval can be shortened without deteriorating the dispatch service, and the position and status of all vehicles can always be accurately grasped. Vehicle dispatch instructions are possible.
[Brief description of the drawings]
FIG. 1 is a schematic system diagram showing an example of an embodiment of an AVM system according to the present invention.
FIG. 2 is a block diagram showing a detailed configuration of the wireless transceiver shown in FIG.
FIG. 3 is a flowchart showing a polling control program for polling control executed in the information processing apparatus of the first base station.
FIG. 4 is a flowchart showing a communication control program for polling executed in the CPU unit of the radio transceiver of the first base station.
FIG. 5 is a flowchart showing a communication control program for polling executed in the CPU unit of the radio transceiver of the second base station.
FIG. 6 is a flowchart showing a communication control program on the vehicle side for polling executed by a CPU unit of a radio device configured in the vehicle.
7 is a time chart for explaining a polling operation in the AVM system of FIG. 1; FIG.
FIG. 8 is a schematic system diagram showing an example of a conventional AVM system.
[Explanation of symbols]
1 AVM system
2 First base station
2A wireless transceiver
2E, 2F, 3C modem
2G remote control device
3 Second base station
3A wireless transceiver
3D remote control device
20 Polling control program
30 Communication control program
40 Communication control program
50 Communication control program
A1 1st service area
A2 Second service area
A3 overlap service area
L1, L2 telephone line
M1, M2, M3, M4, M5 vehicles

Claims (6)

A plurality of vehicles that cover the wireless service area with a plurality of base stations and move within the wireless service area are divided into a plurality of vehicle groups, and any one of the plurality of vehicle groups from the plurality of base stations Collecting necessary vehicle information from each vehicle belonging to the vehicle group specified by the group number by transmitting a group number for specifying the vehicle group via a radio mounted on each vehicle, and collecting In the vehicle information polling method in the automatic vehicle position display system configured to display the vehicle position based on the information obtained,
Each of the plurality of base stations sequentially transmits a group polling signal with base station information that can distinguish the transmission base station to the group number, and is assigned in advance to each vehicle belonging to the vehicle group specified by the group number. Based on the vehicle number of the own vehicle and the base station information added to the received group polling signal, the time slot for the response of the own vehicle may overlap with the time slot for the response from the other vehicle. A vehicle information polling method in an automatic vehicle position display system, wherein the vehicle information of the own vehicle is transmitted within the determined time slot. In the vehicle that has received the group polling signal, a response from the own vehicle is requested by comparing the vehicle number assigned in advance with the group number included in the received group polling signal. The vehicle information polling method in the automatic vehicle position display system according to claim 1, wherein vehicle information is transmitted in some cases. 2. The automatic vehicle position display according to claim 1, wherein in the vehicle that has received the group polling signal, a time slot for response is determined from reception timing of the group polling signal and base station information included in the group polling signal. Vehicle information polling system in the system. The automatic vehicle according to claim 1, wherein synchronization between the plurality of base stations for sequentially transmitting the group polling signal from the plurality of base stations is established between the plurality of base stations using a telephone line. Vehicle information polling system in the position display system. The automatic vehicle according to claim 1, wherein synchronization between the plurality of base stations for sequentially transmitting the group polling signals from the plurality of base stations is established by receiving transmission of an initial group polling signal. Vehicle information polling system in the position display system. The transmission of the group polling signal and the reception of vehicle information transmitted in response thereto are sequentially executed for each vehicle group to obtain vehicle information for all vehicles. 5. Vehicle information polling method in the automatic vehicle position display system according to 5.

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