JPS6268331A - Polling control method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention is applicable to AVM systems (Automatic Vessels).
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.

To understand the activity status of a mobile station, the base station transmits a radio wave called a polling signal, 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. Upon reception, the activity status and 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 returns a response signal 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

[Example] Hereinafter, a polling control method according to the present invention will be explained 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, a control central processing means 102 consisting of a microcomputer etc.) a modulation/demodulation means 103, a remote controller 104, a radio device 105 consisting of a transceiver 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. A control central processing means 204 consisting of a microcomputer, etc., following the modulation/demodulation means 2o3.
When it is determined that is a polling signal P, a response signal A consisting of district data from the signpost signal receiver 205, vacant car data from the taxi meter 206, and car number data from the car number setting means 207 is sent to the polling signal P. - The time slot set by the slot setting means 208 is sent back to the modulation/demodulation means 203 via the radio 202 and the antenna 201. Here, as shown in FIG. 2, the period T between the first polling signal P and the second polling signal P that is performed automatically is divided into n, and n
The divided time is assigned as a time slot to each mobile station 20. However, numbers n and n + are not assigned. Specifically, as shown in FIG. 2, the polling horizontal spread T1 is divided into eight, and the mobile stations 20-1 to 20-6 divide each time slot t8 to t8 after receiving the polling signal P.
Response signals A are sent back sequentially based on t6.

The response signals A sent back in sequence from each mobile station 20 are transmitted 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, communication using the microphone 209 of the mobile station 20 is normally prohibited by the control central processing means 204, but for example, the microphone of the mobile station 20-1 Press the press switch SW on 209.

A call request signal Q from the control central processing means 204 is transmitted via the modulation/demodulation means 203, the radio 202, and the antenna 201. Let us now assume that the time when the one-call request compensation code Q is transmitted is 1° 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, remote controller 104, radio 105 and antenna 106 as shown in FIG. You will receive a reply in due course. On the other hand, at the same time as the response stop signal S is transmitted, the timer means 1
10 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 the response stop signal S, it stops the transmission of the response signal A based on polling, and at the same time cancels the prohibition of the microphone 209 on the mobile station 2°-1. Therefore, from time t shown in Figure 2 to t
During the T2 period at 1□ o'clock, a call is possible, and the voice from the microphone 209 is transmitted via the radio 202 and the antenna 201. 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 1o ends, the polling operation that has been stopped until now is resumed, and the polling signal P is transmitted again at tl1 shown in FIG. It turns out. Of course, if sufficient calls cannot be made during the callable period T2, this period can be extended.

In this way, in addition to cases where the signal transmission between the mobile station 20-1 and the base station 10 is good, the call request signal Q from the mobile station 20-1 may be transmitted to another mobile station 2 due to radio wave conditions.
The response signal A may not be received by the base station 10 due to interference with the response signal A from 0-3.

In a radio wave transmission method, when the modulation method is an FM (frequency modulation) method, the radio wave from the mobile station 2o, which generally has a large electric field strength, is received at the base station 1o. In such a case, the mobile station 20-1 that sent the call request signal Q
Then, the control central processing means 204 immediately detects that there is no response stop signal S returned from the base station 10, and at t7 or t9 when no time slot is assigned to another mobile station 20. The call request signal Q is retransmitted. This t7 or t, sometimes there is no other radio wave, so
It will be reliably transmitted to the base station 10.

[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. Also, there is no need 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 a polling control method according to the present invention. FIG. 2 is a timing diagram showing the relationship between signal transmission and reception between a base station and a mobile station. In the figure, 10 is a base station, 2o is a mobile station, 101 is a keyboard, 102 and 204 are central processing means for control, 103 and 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 (3)

[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. This polling control method is characterized in that it enables a call during the call period and resends the call request signal if a response signal is not returned even though the call request signal has been sent. (2) The polling control method according to claim (1), wherein the retransmission period of the call request signal is a time slot period in which there is no response signal from the mobile station. (3) 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.