JPS6220432A - Polling control system - Google Patents

Abstract

PURPOSE:To perform always communication without a loss time by making it possible to transmit a call request signal from a mobile station even in a polling response period and stopping the transmission of a response signal from each mobile station by a base station when receiving the call request signal. CONSTITUTION:When a polling signal is transmitted from the antenna 106 of a base station 10, a mobile station 20 receives it through an antenna 201, and a control central processing means 204 discriminates the polling signal and returns the position and the action condition of a vehicle. If the press switch SW of a microphone 209 is depressed during the response period of each mobile station 20 based on the polling of the base station, the call request signal from the processing means 204 is transmitted. When receiving the call request signal, the base station 10 transmits a response stop signal to stop the transmission of the response signal based on the polling of each mobile station and call inhibition is released by the microphone 209 of the mobile station 20.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is applicable to an AVM system (Automatic Vacuum System).
The present invention relates to a polling control method in a vehicle monitoring system (vehicle position, etc. automatic display system).

[Prior art] AVM systems use radio waves to determine the location and activity status (actual vehicle,
This is a system that automatically collects vehicles (e.g., empty or under work) at an operation management center (base station), and keeps track of these at all times within the operation management center. AV like this
In the M system, in order to grasp the activity status of a mobile station, a radio wave called a polling signal is transmitted, and the mobile station that receives the radio wave sends a response signal back to the base station, and the base station receives the response signal from the mobile station. By receiving the information, the activity status and the station number (vehicle number) of the mobile station are displayed on a display device such as a CRT display.

[Problems to be Solved by the Invention] During such polling, each mobile station sends a corresponding signal back to the base station using a time slot set for each mobile station. During the response period of all mobile stations, even if any mobile station wanted to make a call, it was impossible to make a call at all. Therefore, the mobile station must select a time other than the polling response period to make a call. Furthermore, in order to secure the call duration, it is necessary to set a desired time interval between the first polling and the next polling when performing automatic polling, and for this reason, it takes a considerable amount of time for automatic polling to complete one cycle. It was time consuming.

[Means for Solving the Problems] However, in order to solve the above-mentioned problems, the present invention enables the mobile station to transmit a communication request signal to the base station even during the polling response period. Upon receiving the call request signal, the base station sends a response stop signal to the mobile station to stop the response signals from each mobile station, and the call between the mobile station that sent the communication request signal and the base station is terminated. This provides a polling control method that makes it possible to

[Embodiment] The polling control method according to the present invention will be explained below with reference to the drawings. Now, assume that polling is performed by operating the keyboard 101 of the base station 10 shown in FIG. Then, the control central processing means 1o2. consisting of a microcomputer or the like. A modulation/demodulation means 103, a remote controller 104, a radio device 105 consisting of a transmitter/receiver, and a transmitting/receiving antenna 1
The polling signal P is transmitted from 06 to t0 shown in FIG.

This polling signal P is received by a radio device 202 consisting of a transceiver via a transmitting/receiving antenna 201 of the mobile station 20, and is further demodulated into a digital signal by a modulation/demodulation means 203. When the control central processing means 204 consisting of a microcomputer or the like identifies the polling signal P, it receives district data from the sign post signal receiver 205, vacant car data from the taxi meter 206, and car number setting means 207. The response signal A consisting of vehicle number data is sent to the modulation/demodulation means 20 using the time slot setting means 208.
3. A reply is sent via the radio 202 and antenna 201 at time t1 shown in FIG.

The response signals A sent back in sequence from each mobile station 20 are sent to the radio device 10 via the antenna 106 of the base station 10.
5, and is further demodulated into a digital signal by the modulation/demodulation means 103 via the remote controller 104, and displayed on the display device 107 following the control central processing means 102, for example, as a vacant car number along with the district name. , is also stored in the external storage device 108, and is stored in the printing device 10 as necessary.
It will be printed out at step 9.

Next, during the response period of each mobile station 20 based on the polling of the base station 10, the press switch SW of the microphone 209 is pressed, although communication using the microphone 209 of the mobile station 2o is normally prohibited by the control central processing means 204. , the call request signal Q from the control central processing means 204 is transmitted to the modulation/demodulation means 2o3. It is transmitted via radio 202 and antenna 201. Here, let us assume that the time when the call request signal Q is transmitted is t2 as shown in FIG.

This call request signal Q is received by the radio 105 via the antenna 106 of the base station 10, and is further received by the remote controller 10.
4, the signal is demodulated into a digital signal by modulation/demodulation means 103. When the control central processing means 204 identifies the call request signal Q, the response stop signal S is transmitted to the modulation/demodulation means 1.
03, a reply will be sent from the remote controller 104, the radio 105 and the antenna 106 at time t3 shown in FIG. On the other hand, simultaneously with the transmission of the response stop signal S, the timer means 11
0 starts and pauses automatic polling.

This response stop signal S is received by the radio 202 via the antenna 201 of the mobile station 20, and is further received by the modulation/demodulation means 20.
3, it is demodulated into a digital signal.

When the control central processing means 204 identifies that it is the response stop signal S, it stops transmitting the response signal A based on polling, and at the same time cancels the prohibition of the microphone 209 from talking. Therefore, during the T2 period from time t4 to time t5 shown in FIG. Furthermore, since the polling function is stopped in the base station 10, the voice from the microphone 111 is transmitted via the remote controller 104, the radio 105, and the antenna 106. Note that 112 and 210 are speakers.

Next, when the callable period T2 set by the timer means 110 of the base station 10 ends, the polling operation that has been stopped until now is resumed, and the polling signal P is transmitted again at 1 s as shown in FIG. It turns out. Of course, if sufficient calls can be made within the callable period T2, this period can be extended.

[Effects of the Invention] As described above, according to the present invention, the mobile station is configured to be able to communicate with the base station even during the response period of the mobile station based on the polling of the base station. This eliminates the inconvenience of having to make a call request after the response period. Furthermore, since it is not necessary to set a fixed interval (loss time) between the first polling and the next polling during automatic polling, the time required for one round of automatic polling can be shortened.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a base station and a mobile station for explaining the polling control method according to the present invention, and FIG. 2 is a timing diagram showing the relationship between signal transmission and reception between the base station and the mobile station. In the figure, 10 is a base station, 20 is a mobile station, 101 is a keyboard, 102, 204 is a central processing means for control, 103, 2
03 is a modulation/demodulation means, 104 is a remote control means, 105,2
02 is a radio device, 106 and 201 are antennas, 107 is a display device, 108 is an external storage means, 109 is a printing device, 1
10 is a timer means, 111.209 is a microphone, 112,
210 is a speaker, 205 is a sign post signal receiver,
206 is a taxi meter, 207 is a car number setting means, 20
8 is a time slot setting means.

Claims (2)

[Claims] (1) In an AVM system in which a mobile station returns a response signal based on a polling signal from a base station, the mobile station is configured to be able to send a call request signal to the base station even during the polling response period. The base station that received this call request signal returns a response stop signal to the mobile station to stop sending response signals from each mobile station, and the communication between the mobile station that sent the call request signal and the base station is terminated. A polling control method that is characterized by making it possible to make calls between people. (2) Polling according to claim (1), characterized in that the mobile station transmits the polling signal again after the call time between the mobile station that transmitted the call request signal and the base station ends. control method.