JP2731748B2 - Dynamic recording method in AVM system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an AVM (Automat
More specifically, the present invention relates to a dynamic item and a recording method of a registration time of the dynamic item.

[0002]

2. Description of the Related Art An example of a conventional AVM system is disclosed in
No. 0-132443 (conventional example 1). In this system, in a system in which a polling signal is transmitted from a base station to a mobile station to return information indicating the state of the mobile station, the base station is provided with a clock for including time information in the polling signal. In addition, the mobile station is provided with a time counter for presetting time information included in the received polling signal, and the counter is driven for time measurement to generate a time on the mobile station side.

In the AVM system described in Japanese Patent Application Laid-Open No. Hei 5-316011 (conventional example 2), the CPU of the AVM slave station device is started when the power of the AVM slave station device is turned on, and is transmitted to the AVM master station device. Request calibration time data,
A timer calibration function for calibrating the display time of the built-in timer of the AVM slave station device based on the calibration time data sent from the AVM master station device is provided. When data is transmitted from the slave station equipment to the master station equipment, the slave station equipment inputs data using the AVM operation unit. The AVM slave station device CPU is AVM
The input data from the operation unit is sent to the modem together with the display time of the built-in timer, and the modem converts the data into an MSK signal and transmits the signal through the radio.

[0004]

Generally, the AVM system is a system for the purpose of collectively managing the activities of vehicles such as fire trucks and taxis and reducing the congestion of wireless lines. It is assumed that the activity status will be reported to the headquarters, and accurate activity content (dynamic items) and the time must be reported with a minimum number of transmissions (for exclusive use of the wireless line).

[0005] In the above-described AVM system of the first conventional example, a master station (base station) is required to perform time management more accurately.
The time of the slave station (mobile station) is adjusted by polling from the mobile station. Polling is performed for each group, and the slave station needs to return the packet regardless of a change in the situation. Therefore, the number of transmissions is increased, which hinders effective use of the wireless line.

Further, in the second prior art in which the slave station requests calibration time data when the power of the slave station is turned on and the time of the slave station is corrected, the time is only adjusted once when the power is turned on. There is no way to adjust the time. Therefore, it is necessary to separately adjust the time as needed.

An object of the present invention is to provide an AVM system capable of recording a dynamic item and its time by effectively using a radio line without increasing the number of transmissions.

Another object of the present invention is to obtain necessary time data even when the AVM terminal is outside the communication area, record dynamic items and the time, and enable later communication.
It is to provide a VM system.

[0009]

According to the present invention, when data for dynamic registration is input and transmitted from the AVM terminal of the mobile station using the operation unit, the AVM master station device of the main office transmits the dynamic data. And returns an ACK signal to the mobile station. By adding the time data linked to the host computer to this ACK signal, the time data recorded in the AVM terminal of the mobile station matches the host computer of the head office and the AVM master station device. Since time data is added to the conventional ACK signal, the number of transmissions considered to be useless does not increase, and unnecessary radio waves are not transmitted.

Further, the AVM terminal does not require a clock circuit. If a timer function is provided, the dynamic registration time can be managed by the time data of the ACK signal and the timer time.

[0011] Further, when the mobile phone is out of the communication area, the GPS
(Global Positioning System
The time can be managed by using the time data from m).

[0012]

Next, one embodiment of the present invention will be described with reference to FIG.

In the firefighting AVM system, in order to prevent congestion of a wireless line, a dynamic item, which is a work content, is communicated to the headquarters 1 by data communication instead of voice communication using an AVM terminal. In this dynamic registration, most of the dynamic registration signals 3 such as dynamic items from the mobile station 2 can be received by the head office 1 and from the communicable area where the ACK signal 4 from the main office 1 can be received. Therefore, most of the ACK signal 4 can be received. By adding the time information of the AVM master station device 10 to the ACK signal 4, the time information of the AVM terminal 20 and the time information of the AVM master station device 10 can be matched.

The mobile station 2 transmits an AVM for reporting the activity status.
When data is input from the operation unit 22 of the terminal 20, the data is converted to an MSK signal by the data transmission unit 23 via the control unit 21,
The data is transmitted to the control unit 21 and transmitted from the wireless device 27. Data of a vehicle number, a dynamic item, and a timer value (set to zero for each registration) are added to the dynamic registration signal 3. The head office 1 receives the dynamic registration signal 3 by the wireless device 16 and
The data receiving unit 13 obtains the vehicle number, the movement item, and the timer value via the command. These data are used as dynamic information
It is sent from the M master station device 10 to the host computer 15. At the same time, in the AVM master station device 10, the timer value received by the data receiving unit 13 is sent to the clock 11, and the corresponding real time is sent from the clock 11 to the data transmitting unit 12.
The data transmission unit 12 converts the vehicle number, the movement item, and the time data into an MSK signal, and transmits the MSK signal via the control unit 14.
6 transmits an ACK signal 4. The mobile station 2 receives the ACK signal, sends time data to the recording unit 26 via the data receiving unit 24, and performs recording. The host computer 15 records the actual time based on the timer value.

ACK signal 4 from head office 1 due to interference or the like
Cannot be received, and re-registration is performed by the retry function of the control unit 21 for automatically re-transmitting, the counter 25 operates when input is performed at the time of initial registration on the operation unit 22, and the re-transmission is performed. The timer value until the execution is added and transmitted.
The head office 1 subtracts the timer value from the registered time and sends it to the host computer 15 as the dynamic registration time. A
The same time as the dynamic registration time sent to the host computer 15 is added to the CK signal 4 and transmitted. The mobile station 2 receives and records this time data.

Outside the communicable area, data is input by the operation unit 22 of the AVM terminal 20, and the dynamic registration signal 3 is transmitted. However, the head office 1 cannot receive and the ACK signal 4 is not returned. Since the mobile station 2 cannot receive the ACK signal 4,
The control unit 21 repeats the retry a specified number of times. The number of times can be set, for example, up to nine times. When the registration cannot be performed all the times, the control unit 21 requests the time data from the GPS 28 and records the time obtained by subtracting the timer value from the GPS time data in the recording unit 26.

The AVM master station 10 is periodically notified of the actual time, for example, every 30 minutes from the host computer 15, and the time of both is adjusted.

[0018]

As described above, according to the present invention, the number of transmissions can be reduced by including time data in the ACK signal transmitted from the head office in response to the dynamic registration signal for reporting from the mobile station. Without increasing, the head office and the mobile station can record the dynamic items and the time at which the wireless line is effectively used.

Further, even when the mobile station is outside the communication area, the mobile station records the dynamic items and the time thereof,
Enables later contact with headquarters.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating an AVM system according to an embodiment of the present invention.

[Explanation of symbols]

 1 Head Office 2 Mobile Station 3 Dynamic Registration Signal 4 ACK Signal 10 AVM Master Station Device 20 AVM Terminal

Claims (2)

(57) [Claims] 1. A dynamic item indicating the content of the activity and whether it is registered at the time of dynamic registration.
The headquarters office receiving the dynamic registration signal including the timer value indicating the time from the report time to the mobile station calculates the actual time based on the timer value, and transmits the actual time to the mobile station together with the dynamic item in the ACK signal. A dynamic recording method in an AVM system, wherein the dynamic recording is performed. 2. A dynamic item indicating the content of the activity and whether it is registered at the time of dynamic registration.
If the mobile station transmits a dynamic registration signal including a timer value indicating the time from the time of reporting to the mobile station, but cannot receive an ACK signal from the head office, based on the time data from the on-board GPS and the timer value A dynamic time recording method in an AVM system, wherein an actual time is calculated and recorded together with the dynamic item.