JPH0124452B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the polling response method of an AVM system (Automatic Vehicle Monitoring System) for taxi business.

The distributed transmission AVM system installs radio location land stations (hereinafter referred to as signposts) in various locations in urban areas that transmit local signals and point signals with very low transmission power, and mobile stations receive the local signals and point signals. Detects the location of the own station.
In addition, as a method for detecting mobile stations located in each signpost area on the base station side, mobile stations located in the relevant signpost area, that is, mobile stations that receive and memorize the regional signal and point signal of the relevant signpost. Only the mobile station is polled, and the station number of that mobile station is sent back and registered on the base station side.

When this polling method is adopted in an AVM system for taxi business, generally, each mobile station is divided into groups consisting of multiple units, time slots are assigned to each group, and time slots are assigned to each group. A method is adopted in which responses are sent sequentially. In this method, if multiple mobile stations of the same group are located in the same signpost area, radio wave congestion occurs because these mobile stations simultaneously transmit responses in the same time slot, and data is transmitted using digital signals. When transmitting, depending on the difference in electric field input, it is possible to determine whether one of them is registered or not.
Otherwise, they will not be registered at all.

On the other hand, since the mobile station side receives empty vehicle information from the toll meter, after the base station issues a vehicle dispatch command to the mobile station, the vehicle dispatch command is issued before the mobile station switches the toll meter from an empty vehicle to an actual vehicle. If you poll the same signpost area as the signpost area, the mobile station will send a response again.
In addition to the problem that a mobile station that has already been dispatched is re-registered, there is also a problem that it interferes with the response transmission of other mobile stations in the same group.

The present invention aims to eliminate the above-mentioned problem by preventing a vehicle that has already been dispatched from transmitting a response at the next polling. In this method, transmission of a response to polling is temporarily stopped in conjunction with a switch operation or the like for transmitting an acknowledge response signal.

FIG. 1 shows the configuration of a mobile station device according to the present invention, where 1 is an antenna, 2 is an antenna duplexer, 3 is a receiver, 4 is a radio, 5 is a communication control device, and 6 is a charge meter.

FIG. 2 is a system diagram of the communication control device 5 of the present invention, where 11 is a connection terminal with the receiver 3, 12 is a connection terminal with the reception output of the radio 4, and 13 is the transmission input of the radio 4. 14 is a connection terminal for the charge meter 6, 15 is a sign post signal receiving section, 16
Reference numeral 17 indicates a sign post area data storage section, 17 indicates a polling signal reception section, 18 indicates a comparison section, 19 indicates a data transmission control section, 8 indicates an acknowledgment response storage section, and 7 indicates an acknowledgment response setting section.

Next, the operation will be explained.

In FIG. 1, a local signal radio wave from a sign post is received through a route including an antenna 1, an antenna duplexer 2, and a receiver 3, and is supplied to a communication control device 5.
The polling signal radio wave is received through the route of antenna 1, antenna duplexer 2, and radio device 4, and is supplied to communication control device 5. In addition, the transmission data is transmitted to the communication control device 5, the radio device 4, the antenna duplexer 2, and the antenna 1.
It is sent via the following route. Incidentally, the fare meter 6 sends a signal to the communication control device 5 as to whether the vehicle is occupied or not.

In FIG. 2, the sign post signal radio wave reception output from the receiver 3 is taken in at the connection terminal 11, demodulated by the sign post signal receiving section 15, and stored in the sign post area data storage section 16.
On the other hand, the polling signal radio wave reception output from the radio device 4 is taken in by the connection terminal 12 and demodulated by the polling signal receiving section 17. Comparison section 18 compares the contents of sign post area data storage section 16 and the contents of the demodulated output from polling signal reception section 17, and if they match, sends a signal to data transmission control section 19. The data transmission control unit 19 determines that the signal from the connection terminal 14 with the fare meter is that the car is empty, and
When there is no signal from the acknowledge response storage section 8, the station number data of the own station is supplied to the radio device through the connection terminal 13 connected to the radio device transmission input.

On the other hand, when the mobile station receives a vehicle allocation command, the signal set by the acknowledgment response setting section 7 is sent to the acknowledgment response storage section and stored therein. The setting section is configured with a switch, for example, and is turned on when a dispatch command is received. Further, the acknowledgment response storage section 8 continuously sends a signal to the data transmission control section 19.

When the data transmission control section 19 receives the signal from the acknowledgment response storage section 8, it supplies the acknowledgment data to the radio 4 in the same manner as the station number data transmission, and also receives the signal from the comparison section 18 and connects the charge meter. Terminal 1
Even if the signal from No. 4 is an empty car, the station number data is controlled not to be supplied to the radio.

The acknowledgment response storage section 8 is reset when the signal from the fare meter connection terminal 14 becomes an actual vehicle, and stops sending the signal to the data transmission control section 19.

As explained above, according to the method of the present invention, the mobile station side receives a vehicle dispatch command and sets an acknowledgment response, so that the mobile station does not respond to polling until the vehicle becomes an actual vehicle and becomes vacant again, thereby eliminating the above-mentioned problem.

In this explanation, a method is used in which the mobile station detects its own area using a sign post, but the method is also the same with other methods in which the mobile station detects its own area.

Furthermore, although the acknowledgment response storage section is reset by the actual vehicle signal from the fare meter, the same effect can be obtained by providing a timer and resetting it as time elapses.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a mobile station device of the present invention, and FIG. 2 is a system diagram of a communication control device of the present invention. 1: antenna, 2: antenna duplexer, 3: receiver, 4: radio, 5: communication control device, 6: charge meter, 7: acknowledgment response storage section, 8: acknowledgment response setting section, 11: receiver and 12: Connection terminal for radio reception output, 13: Connection terminal for radio transmission input, 14: Connection terminal for charge meter, 1
5: Sign post signal receiving section, 16: Sign post area data storage section, 17: Polling signal receiving section, 18: Comparing section, 19: Data transmission control section.

Claims (1)

[Claims] 1 The mobile station side detects the area where it is located, and the base station side polls the area and collects data, and each mobile station is divided into groups of multiple units, and time slots are allocated for each group. In an AVM system that transmits responses to polling sequentially in time slot order, the mobile station has a vehicle allocation acknowledgment response signal setting unit and a storage unit that stores the acknowledgment response signal, and the acknowledgment response signal is set. A polling response method characterized in that in a stored state, no response to polling is sent until the storage is released.