JPH0492521A - Collection system for information on mobile station - Google Patents

Abstract

PURPOSE:To improve the collecting efficiency of information on a mobile station by discontinuing the transmission of an answer signal for a prescribed period of time if the carrier of another station exists after transmission the first answer signal among plural answer signals transmitted from the mobile station in response to the cells of a calling means. CONSTITUTION:A calling means applies a polling to a mobile station 14 included in a specific range of a radio service area SA where the station 14 is called out of a command station. Meanwhile an answer means transmits repetitively plural answer signals of the station 14 in response to the calls of the calling means. Then an answer stop means stops the transmission of the answer signals transmitted from the answer means for a prescribed time if the carrier of another station exists when a prescribed time passed after the first answer signal of the station 14 is transmitted in response to the call of the calling means. As a result, a mobile station included in a specific range can be detected in a short time. Then the information on the mobile station can be effectively collected.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention manages multiple vehicles and constantly commands situations such as transportation of people and cargo, patrols by police, security companies, etc., and vehicle placement. This relates to a mobile station information collection system that is grasped by the station and controls the operation of the vehicle.Mobile stations are not limited to mobile stations such as vehicles and ships, and the mobile station moves as the location changes over time. It is something that targets things.

[Prior art] As this type of mobile station information collection system, AVM (8u
LomaL]c Vehicle Monitorin
g) The method is known. Here, a typical AVM method will be explained.

Fig. 7 is a schematic diagram of a conventional AVM distributed transmission system, Figure 8 is a schematic diagram of a conventional AVM distributed reception system, and Figure 9 is a schematic diagram of a conventional AVM semi-automatic system. be.

In the distributed transmission method, which is one of the AVM methods, a large number of signposts 1-2 (2a to 2e) that constantly transmit location signals are installed in a distributed manner, and information from a communication station 1 such as a user operation management center is transmitted to Output within the service area of zones A-E.

The mobile station 4 receives position signals from the nearest sign posts 2a to 2e, and in addition to the position signals of the service areas of the sign posts 2a to 2e, it also receives information such as recognition of its own mobile station (hereinafter referred to as Simply, r I D (IdenLI
This is a technique in which the data is sent directly to the command station 3 with the addition of "I'1caLion)J".

In addition, in the distributed reception method, in response to polling or simultaneous paging from the command station 3, mobile stations 4 within a predetermined service area transmit their IDs to the nearest sign posts 2a to 2.
e, and the signals received by the sign posts 2a to 2e are transmitted to the communication station 1 by wire, with the ID of the own station added to the signal for each service area.

In the semi-automatic method, in response to a polling or simultaneous call from the command station 3, the mobile station 4 presses a button for that region and transmits its own ID and a predetermined encoded regional signal to the command station 3. However, the command station 3 transmits it to the communication station 1 by wire.

[Problem to be solved by the invention] However, in the above distributed transmission method, the sign posts 2a to 2
A receiver for receiving radio waves from e and a communication device for communication with the command station 3 are required, which increases the cost of the entire system.Also, since the service areas of the signposts 2a to 2e cannot overlap, A blank area was occurring. Even with the distributed reception method, a transmitter for transmitting radio waves to the sign posts 2a to 2e, a communication device for communication with the command station 3, and a wired circuit network between the sign posts 2a to 2e and the communication station 1 are required. This increases the cost of the entire system, and since service areas cannot overlap, blank areas occur between service areas.

These distributed transmission systems and distributed reception systems require two or more types of frequencies and a corresponding communication device, which poses a problem in that the entire system becomes expensive. Furthermore, blank areas in the service area always occur, and it is logically difficult to eliminate them.

In addition, in the semi-automatic method described above, it is difficult to subdivide the region, and most of the information exchange relies on human operations, so there is a risk of human errors such as region codes and human errors. It's a person.

Therefore, an AVM system using polling that solves the above-mentioned problems is currently known, such as in Japanese Patent Laid-Open No. 62-269522.

That is, the technique disclosed in Japanese Patent Application Laid-Open No. 62-269522 is a random number generating means for generating random numbers in an AVM system in which a mobile station called by a command station by polling carries information on a carrier and transmits it to the command station. a carrier detection means for reading a random number from the random number generation means and detecting the presence or absence of a carrier being transmitted from another mobile station at a time corresponding to the random number; and information when the carrier detection means does not detect a carrier. This is a transmission means for transmitting the information on a carrier to a command station.

However, this type of technology does not specify a specific polling area for polling within the wireless coverage area;
When there are many mobile stations under a specific supervision, it takes time to search for the target mobile station, and carriers transmitted from other mobile stations at the time corresponding to the random number from the random number generator Since the system detects the presence or absence of a target mobile station and sends out information, even if there are few mobile stations under supervision, a certain amount of wasted time is required to search for the target mobile station. Furthermore, since a random number generating means is required, signal processing becomes complicated and the mobile station equipment becomes expensive.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a mobile station information collection system that can search for mobile stations within a specific range in a short time and efficiently collect information about the mobile stations.

[Means for Solving the Problems] A mobile station information collection system according to the invention of claim 1 includes a command station that communicates with a plurality of mobile stations and collects information of the plurality of mobile stations, and provides wireless service. In response to a call from a calling means that calls mobile stations in a specific range within the area, a response signal from the mobile station is repeatedly sent out multiple times, and a single response signal from the mobile station corresponding to the call from this calling means is sent out. rear,
After a predetermined time, when there is another carrier, the transmission of the response signal is stopped for a predetermined time.

In the mobile station information collection system according to the second aspect of the invention, the response signal is sent from the response means after the presence of another station carrier cannot be detected.

The mobile station information collection system according to the invention of claim 3 comprises: 1
The predetermined time for detecting the presence of another station's carrier after sending a return response signal is a random time.

[Function] In the invention of claim], by specifying a range within a wireless service area by a paging step, the number of mobile stations is limited and the mobile station is called, and the response means of the mobile station is activated by the calling means. A response signal is repeatedly sent out multiple times in response to the call. At this time, the response signal from the response means detects the presence of another station carrier after a predetermined time after the response stop means sends out the one-time response signal of the mobile station corresponding to the call from the calling means; When another station carrier is present, the transmission of the response signal from the response means is stopped for a predetermined period of time to prevent interference in which a plurality of mobile stations transmit response signals at the same time. Further, in the invention according to claim 2, the response speed of the response signal is improved by immediately transmitting the response signal of 1li1 of the mobile station corresponding to the call by the calling means. Since the transmission is stopped while the presence of the other station's carrier can be detected, communication becomes possible as soon as the other station's carrier disappears.

In the invention of claim 3, a specific ranking is given to the mobile station by setting the predetermined time for detecting the presence of another station carrier after the mobile station transmits the first response signal to be a random time. Since there is no such thing, the response ranking is fair.

[Embodiment] FIG. 1 is an overall configuration diagram showing an outline of a mobile station information collection system that is an embodiment of the present invention. FIG. 2 is a block diagram of a mobile station in a mobile station information collection system which is an embodiment of the present invention, and FIG. 3 is a block diagram of a command station in a mobile station information collection system which is an embodiment of the invention. It is a diagram.

In the figure, the δ1 satellite of this embodiment (hereinafter simply referred to as rGPS (Global Po5L))
tng System) J) 11, 12.13
is an artificial satellite launched by the United States that outputs a frequency for positioning, and it measures the mobile station position from the position of the artificial satellite, and as is known, it takes three or more to obtain positioning information. 2 GPS II, 12.13 is used.

The mobile station 14 such as a vehicle in this embodiment is a communication means carried by a mobile object such as a vehicle, and receives GPS II, 12.
3 and the mobile station 14 is determined. Each GPS
II, 12.13 is operating in a determined orbit around the earth, and each GPS II, 12.13 in the orbit-L is
The position of the mobile station on the earth] is calculated from the position and distance of 4 and the position is specified, and the detection error is set to an accuracy within a range of 100 m, according to experiments by the inventors. I can do it. The mobile station 14 calculates its position using a known GPS receiver, and usually sends latitude and longitude information to the command station 15.
to be transmitted. The command station 5 displays the operating status of the mobile station 14 by superimposing the position of the mobile station 14 on, for example, a CRT or panel displaying a map. The command station 15 has a normal wireless service area SE, and a plurality of command stations 5 may be arranged as necessary.

Next, the configuration of the mobile station 14 of the mobile station information collection system according to this embodiment shown in FIG. 2 will be explained.

In FIG. 2, the antenna 21 is a GPS II.

Receive radio waves on 12.13. The GPS receiver 22 is a GP
This is a measurement receiver for obtaining latitude and longitude position signals from SII, 12.13 radio waves.

The latitude/longitude information modulator 23 converts the latitude and longitude signals output from the GPS receiver 22 into digital signals of a frequency suitable for wireless transmission, such as DTMF (Dual
Tone Multi Frequency) signal. The ID information modulator 24 is a modulator for transmitting information about the mobile station 14 itself, for example, if the mobile station 14 is a vehicle, vehicle recognition information such as its car number. The adder 25 adds the latitude and longitude information output from the latitude/longitude information modulator 23 and the ID information output from the ID information modulator 24 to form a series of digital signals. The transceiver interface (1/F) 26 outputs output signals of latitude and longitude information and ID information to a transceiver 27 (to be described later), and also detects the presence of other station carriers via the transceiver 27. This is an interface for detection.

) - The transceiver 27 is a normal mobile radio, and transmits the previous latitude and longitude information and ID information to the command station 15, and detects the presence of other station carriers, that is, determines the transmission status of other mobile stations by reception. do. Further, the transceiver 27 performs voice communication with the command station 15 through a speaker 28 and a microphone 29. Further, the communication antenna 30 propagates radio waves to and from the transceiver 27.

The controller 31 sends latitude and longitude information, ID information signals, or controls voice communication based on commands received from the command station 15. The memory 32 temporarily stores location information of the mobile station 14.

Next, the configuration of the command station 15 of the mobile station information collection system according to this embodiment shown in FIG. 3 will be explained.

In FIG. 3, an antenna 4 for communication with a mobile station 14 is connected to a transceiver 42, similar to the mobile station 14 in FIG.
have. The output of the transceiver 42 is connected to the transceiver interface (1/1) upon receiving latitude and longitude information.
F) 45, latitude/longitude/ID information demodulator 46 outputs latitude/longitude information and ID information as digital signals. The display controller 47 displays the map position on the screen of the display CRT 49, in other words, the latitude and longitude points of the mobile station 14 are displayed with ID codes and .

The map selection circuit 48 outputs and displays a map based on latitude and longitude information on the screen of a display CRT 49 using a built-in map database. The controller 51 is composed of a microcomputer, and polls all the mobile stations 14 or polls a predetermined range, and collects latitude and longitude information, ID information, etc. of all the mobile stations 14.
It absorbs various information such as information and stores it in the memory 52.

In addition, in response to position designation polling based on latitude and longitude information received from the specific mobile station 14 or a mobile station in a predetermined service area 4, various information such as latitude and longitude information and ID information is manually input. . At this time, the latitude and longitude information, the ID generator 5o, and the screen on the display CRT 49 are switched. The memory 52 stores various information such as latitude and longitude information and ID information as a result of polling all the mobile stations 14, and also determines which mobile stations in the wireless service area are to be polled. It is used to update and store the ID code, latitude, degree, etc. of the mobile station 14 every time all mobile stations 14 are polled. This read/write operation of the memory 52 is performed by the controller 51. Commands such as a destination to the controller 51 are input using a digitizer or a mouse 53.

The mobile station information collection system according to the embodiment of the present invention configured as described above operates as follows.

Normally, the map selection circuit 48 is controlled by the controller 51.
A wireless service area is set according to the communication capability of the mobile station 14, and a map of the entire service area is displayed on the screen of the display CRT 49. The controller 5] drives the ID generator 50, generates ID information for a specific mobile station 14 all at once by polling or broadcasting, specifies a region, or transmits the signal to the transceiver interface (1/1). F) 45
The transceiver 42 converts the signal into an output signal, and outputs the signal from the antenna 41.

On the other hand, the antenna 2] receives the radio waves of GPS], 1, 12.13, and the GPS receiver 22 receives the radio waves of GI) S], ]
, .

Latitude and longitude position information is detected from the radio waves of 12.1.3, and the information is output to the latitude/longitude information modulator 23. If the signal received by the transceiver 27 via the antenna 30 by polling targeting all mobile stations 14 includes ID information specifying the own station, the controller 3
1 adds the ID information of the ID information modulator 24 to the latitude and longitude position information output of the latitude/longitude information modulator 23 in an adder 25 to form a series of signals, - transmit it to the command station 15 via the transceiver 27; Furthermore, when a mobile station 14 within a predetermined range is called by polling that specifies a specific range, the call is received by the transceiver 27, and the controller 31 makes a call to the mobile station 14 located within the predetermined range based on the position information in the memory 32. When it is determined that the controller 31 is within the range (area) of
The information is added by an adder 25 to form a series of signals, and the same signal is repeatedly transmitted twice to the command station 1'5 via the L/transceiver interface 26.1-transceiver 27.

On the command station 15 side, the signal is received by the transceiver 42 via the antenna 41, and the transceiver interface 4
5, the latitude/longitude/ID information demodulator 46 outputs latitude/longitude information and ID information as digital signals.・The roller 47 displays the latitude and longitude points on the map on the screen of the display CRT 49.
Display the D code and. At the same time, the latitude/longitude information and ID information of the latitude/longitude/ID information demodulator 46 are stored in the memory 52.

In addition, when a command such as a destination is manually given to the controller 51 using a manual means 53 such as a digitizer or a mouse,
The controller 51 polls from the memory 52 mobile stations 14 within a predetermined range within a wireless service area centered on the destination. When the mobile station 14 does not respond within that range, the range of the wireless service area centered on the destination is expanded, and the mobile station 14 is polled within a predetermined expanded range centered on the destination. When a mobile station does not respond within the range, the predetermined range of the wireless service area centered on the target location is expanded one after another.

When a mobile station responds with a po link within a predetermined range of the wireless service area centered on the destination, mobile station 1 that responded
The ID code and . are displayed on the screen of the display CRT 49 at the latitude and longitude points of 4, and in particular, . is displayed by blinking repeatedly. At the same time, latitude and longitude information and ID information are stored in the memory 52 and maintained until the destination search state is canceled.

The mobile station information collection system of this embodiment is controlled as shown in FIGS. 4 and 5.

FIG. 4 is a flowchart 1 for controlling a mobile station in a mobile station information collection system that is an embodiment of the present invention, and FIG. 5 is a flowchart 1 for controlling a mobile station in a mobile station information collection system that is an embodiment of the present invention. 3 is a flowchart for controlling the command station of FIG.

FIG. 6 is an explanatory diagram showing a timing chart of a response signal after a mobile station information collection system according to an embodiment of the present invention.

First, initialization is performed in step SO, and latitude and longitude information is detected as current location information of the own station in step S1. Are all mobile stations 14 polled in step S2?
When it is determined that the local station is not being polled, it is further determined in step S3 whether it is a range specified polling in which the area is a specified range of the wireless service area or not based on the contents of the transmitted code. When it is not range specified polling, the routine from step S1 to step S3 is repeatedly executed. When it is determined in step S2 that all the mobile stations 14 have been polled and that the own station has been designated, the own station ID code is added to the latitude and longitude information as own station information in step S4, and the own station ID code is added to the command station 14 as own station information. Send to.

Further, when it is determined in step S3 that predetermined range information is sent only to mobile stations 14 within a specific range of the wireless service area, and range specified polling is performed to call mobile stations 14 within that range, step In S5, it is determined whether the own station is being called, and when the own station is called, in step S6, as a single response signal, the own station ID code is added to the latitude and longitude information of the own station information, and the own station ID code is added as necessary. , and sends other information about the current local station, such as empty vehicles and remaining amount of cargo, to the command station 15. Next, in step S7, the transceiver 27 waits for a predetermined time, and then in step S8, the transceiver 27 receives whether or not a response signal is being sent from another mobile station 14. , waits for a predetermined time in step S9, and determines in step S10 whether the response signal from the own station is sent twice.If not, enters the routine of step SIO from step S6, and sends the same information twice. A response signal containing the contents is sent to the command station 15.

On the other hand, in the command station 15, as shown in FIG. 5, initialization is performed in step S11, polling is performed to obtain position information of all mobile stations 14 in step S12, and
In step S3, the position information of all mobile stations 14 is stored in the memory 52, and in step S14, it is displayed on the screen of the display CRT 49 at latitude and longitude points on the map with ID codes and .

Then, in step S15, it is determined whether the destination has been input using manual means such as a digitizer or a mouse, and if the destination has not been input, the routine from step S12 to step S15 is repeatedly executed. That is, during this period, all mobile stations 14
are displayed on the screen of the display CRT 49 on a map with ID codes and . at latitude and longitude points, and their positions can be monitored.

When a destination is input from the input means 53 such as a digitizer or a mouse in step S15, range specification polling is started in step S16. In this range-specified polling, the first polling target is a radius Ro [Km] centered on the destination, and movement within a radius R6 [Km] at the latitude and longitude of the map on the screen of the display CRT 49. Based on the latitude and longitude information stored in the station 14, that is, the memory 52, mobile stations 14 within a radius of R6 [Km] are simultaneously called. In step S17, it is determined whether there is a response to the polling, and if there is no response, the range to be polled is expanded in step S18, and the mobile stations 14 within a radius R, [Km] are set as the next polling area. set to target. Then, step S16
The call is made again in step S17, and it is determined whether or not there is a response to the call, and if there is no response,
As described above, at the Nth time, the mobile stations 14 within a radius of RN-1 [Km] are targeted as the polling area.

In the polling of the specific range, when a response is confirmed in step S17, information on the mobile station 14 that responded in step S9 is stored in the memory 52, and at the same time,
Display CRT 4.9 Displays the map on the screen by repeatedly blinking the ID code and ★ at the latitude and longitude points. This display state is maintained until a reception confirmation signal is sent in step S20 and the specific destination input is canceled in step S21. When the specific destination input is canceled, the routine starts from step S12. .

As mentioned above, if it is necessary to dispatch a vehicle to a specific destination, for example, steps S15 to S
17 polls mobile stations 14 in a specific range within the wireless service area SA. At this time, if a mobile station 14 within a specific range responds, the information of the mobile station 14 that responded is stored in the memory 52, and at the same time, the ID is added to the latitude and longitude point of the map on the screen of the display CRT 49. It is displayed by repeatedly flashing the code and ★ and continues to be displayed until the specific destination input is canceled. If the mobile station 14 is a patrol car, taxi, etc., the mobile station 14 can be instructed to start the mobile station 14 from the mobile station 14 closest to a specific destination, and to move the one with the shortest distance. . The response contents of the mobile station 14 include, for example, information on whether the taxi is empty, actual or forwarded, information on the patrol car being on patrol or moving to the destination, and information on the delivery being carried out in the case of a courier.
During collection, information about the mobile station 14 itself, such as the amount of baggage, can be transmitted, or the results of the determination can also be transmitted.

Further, when there is no response from the mobile station 14 in the specific range within the first wireless service area A, step S16
In step S18, the wireless service area SA is
It is possible to expand the width of the specific range to be polled within the destination, and gradually switch to selecting mobile stations 14 that are further away from the specific destination, so that the nearest mobile station 14 can always be selected.

Therefore, in the mobile station information collecting system of this embodiment, the presence of a mobile station 14 at a specific location or near a specific location can be found in a short time, and information about the mobile station 14 can be obtained.

” Since the display means for displaying the response of the mobile station 14 in the second embodiment displays the location of the mobile station 14 and information about the mobile station 14 itself, the object responding to polling is the location of the mobile station 14. Since the conditions for the mobile station 14 itself can be added, it is possible to create a mobile station information collection system that matches the usage of the mobile station 14.

The response of the mobile station 14 in the wireless service area of the mobile station information collection system according to the embodiment described in 2 is based on whether the mobile station 14 is present in the polled service area and satisfies predetermined conditions. However, since the information is sent only when the own station corresponds, polling is performed using the ID code of the mobile station 14 near the target position based on the position information, and the command station 15 side sends the information to the target position. This is suitable for searching for nearby mobile stations 14.

As described above, the mobile station information collection system of this embodiment includes a plurality of mobile stations 14 and a command station 15 that communicates with the mobile stations 14 and collects information on the plurality of mobile stations 14. In the collection system, calling means includes a routine of step S15, step S16, step S17, and step S18 for polling mobile stations 14 in a specific range within the wireless service area SA to call mobile stations 14 in a specific range within the wireless service area. , a response means comprising a routine from step S6 to step S10 for repeatedly sending a response signal of the mobile station 14 corresponding to the call of the calling means a plurality of times, and a first response signal of the mobile station corresponding to the call of the calling means. After the predetermined time determined in step S7, the presence of another station carrier is detected in step S8, and when the other station carrier is present, the response signal is transmitted from the response means for the predetermined time determined in step S9. and a response stop means for stopping the response.

Therefore, if there are two mobile stations 1.4A and 14.8 that meet the conditions for responding within a specific range, those two mobile stations 14A and 14B are called by polling within the specific range. If there are two mobile stations 14. as shown in FIG. A, 14B are almost simultaneously response signals 14al, 1
4 old will be sent out. At this time, the first response signal 14al is received.

14 old has a high probability of interference, and the command station 15 may not be able to accurately decipher the information. Therefore, in response to the routine from step S7 to step SIO, it is possible to stop sending out the own station's response signal 14b2' in response to the other station's response signal 14a2 by determining whether or not another station's carrier exists. , the response signal 14b2' is transmitted without interference, and after a predetermined time, the response signal 14b2 of the own station is transmitted. At this time, two mobile stations 14A,
14B is the response signal 1 that is almost simultaneously and has the same information length.
6al and 16old, the response order of the two mobile stations 14A and 14B is determined by the time setting in step S7. To impart fairness (J) to this kind of response ranking,
It is preferable to set the random time using a random pulse generation circuit (see Patent Pulse Circuit Technology Encyclopedia; published by Ohm Co., Ltd.) or the like. Note that the time setting in step S9 is set to be slightly longer than the average response time.

” - In the embodiment described above, a case has been described where there are two mobile stations 14A and 14B that meet the conditions for responding within a specific range. , it is also possible to output the response signal multiple times depending on the routines from step S7 to step SIO. However, even in this case, if there is only one mobile station 14 meeting the conditions to respond within a specific range, a one-time response signal is received by the command station 15, and the communication can be ended quickly.

In the embodiment described above, when there is a carrier of another station in step S8 and step S9, the next response signal is sent out after waiting for a predetermined period of time. The presence of carriers of other stations may be detected, and during this time the process may stop at step S8, and when the carriers of other stations are exhausted, the process of step SIO may be started. By performing such processing, the intervals between response signals can be made closer, and moreover, response signals from many mobile stations 14 can be processed without interference.

By the way, when a designated position for a specific purpose is input to the controller 51 from the manual means 53 such as a digitizer or a mouse in the above embodiment, steps S15 and S16 poll the mobile stations 14 in a specific range within the wireless service area SA. , the calling means in step S17 expands its search distance around the designated target position;
When implementing the present invention, a specific range for polling can be set based on the map of the database used by the command station 15, taking into account road conditions.

In addition, in the common sense embodiment, when there is no response from the mobile station 14 in a specific range of the polled wireless service area, an expanded polling means consisting of step S16 to step S]8 for sequentially expanding the specific range and repeatedly polling is provided. and when implementing the present invention, the command station 15
It is possible to set a specific range for polling based on the map of the database used on the side, taking into account road conditions.

Note that when implementing the present invention, the present monitoring system can be configured at a low cost by sequentially expanding the search distance around the designated target position.

Furthermore, when polling is performed taking into consideration the movement conditions of the mobile station 14 such as road conditions, the mobility can be increased.

Then, when the mobile station 14 of the mobile station information collection system of the second embodiment responds to any polling, the display means for displaying the information of the mobile station 14 is configured to display latitude, longitude, and TD.
The information demodulator 46 decodes the positioning information and the ID information of the mobile station itself, displays the corresponding area on the display CRT 49 based on the obtained positioning information, and superimposes the mobile station 14 on the map. It is used to display the location. However, when implementing the present invention, a map that receives a transmission signal from the mobile station 14, demodulates the positioning information and the information of the mobile station 14 itself, and displays the corresponding area based on the obtained positioning information. It suffices if the location can be displayed at any time.

Furthermore, the response means consisting of the routine from step S6 to step 31.0 for repeatedly sending out a response signal of the mobile station 14 in response to a call by the calling means has been explained in the case of sending out a response signal twice, but in this case, When implementing the invention, it can be applied to a device that sends out a response signal more than once.

[Effects of the Invention] As stated above, the mobile station information collection system of the invention of claim 1 includes a mobile station comprising a command station that communicates with a plurality of mobile stations and collects information on the plurality of mobile stations. In an information gathering system, a response signal of a mobile station corresponding to a call from a calling means that calls mobile stations in a specific range within a wireless service area is repeatedly sent out multiple times, After a predetermined period of time after sending the response signal,
Since the presence of the carrier of another station is detected and the transmission of the response signal sent from the response means is stopped for a predetermined period of time when the carrier of another station is present, the mobile station that is required to respond within a specific range If there are multiple mobile stations, mutual interference due to simultaneous transmission by multiple mobile stations can be eliminated, and if there is only one mobile station within a specific range that meets the conditions to respond, a single response signal can be sent to the command station. This allows the communication to be completed quickly. Therefore, a mobile station within a specific range can be searched for in a short time, and information about the mobile station can be collected efficiently.

In the mobile station information collecting system of the invention of claim 2, since the response signal is sent from the response means when the other station's carrier no longer exists, communication can be performed at the same time as the other station's carrier disappears. becomes.

The mobile station information collection system according to the invention of claim 3 assigns a specific ranking to the mobile station by setting the predetermined time for detecting the presence of another station carrier as a random time after the mobile station sends the first response signal. Since it is not assigned, the response ranking is fair.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram showing an outline of a mobile station information collection system that is an embodiment of the present invention, and FIG. 2 is a block diagram of a mobile station of the mobile station information collection system that is an embodiment of the present invention.
FIG. 3 is a block diagram of a command station of a mobile station information collection system that is an embodiment of the present invention, and FIG. 4 is a flowchart for controlling a mobile station of a mobile station information collection system that is an embodiment of the present invention. FIG. 5 is a flowchart for controlling a command station of a mobile station information collection system which is an embodiment of the present invention, and FIG. 6 is a flowchart of a mobile station response signal of a mobile station information collection system which is an embodiment of the present invention. An explanatory diagram showing a timing chart, FIG. 7 is a schematic diagram of a conventional AVM distributed transmission method, FIG. 8 is a schematic diagram of a conventional AVM distributed reception method, and FIG. 9 is a diagram of a conventional AVM distributed transmission method. FIG. 2 is a schematic configuration diagram of a semi-automatic system. In the figure, 11.12.13 + positioning satellite (GPS) 14: mobile station 1.5 = command station 31, . 51: Controller 32. 52: Memory SA: Wireless service area. In the drawings, the same reference numerals and the same symbols indicate the same or equivalent parts. Patent applicant Aisin Seiki Co., Ltd.

Claims (3)

[Claims] (1) In a mobile station information collection system consisting of a plurality of mobile stations and a command station that communicates with the mobile stations and collects information on the plurality of mobile stations, calls mobile stations within a specific range within a wireless service area. paging means; response means for repeatedly transmitting a mobile station response signal corresponding to the paging by the paging means a plurality of times; mobile station information, further comprising a response stop means for detecting the presence of another station carrier, and stopping transmission of a response signal from the response means for a predetermined time when another station carrier is present. Collection system. (2) In a mobile station information collection system consisting of a plurality of mobile stations and a command station that communicates with the mobile stations and collects information on the plurality of mobile stations, calling mobile stations within a specific range within a wireless service area. paging means; response means for repeatedly transmitting a mobile station response signal corresponding to the paging by the paging means a plurality of times; 1. A mobile station information collecting system, further comprising: a response stop means for detecting the presence of another station carrier, and stopping transmission of a response signal sent from the response means when the other station carrier is present. (3) The mobile station information collecting system according to claim 1 or 2, wherein the predetermined time for detecting the presence of another station carrier after the mobile station transmits the first response signal is a random time. .