JP3150413B2 - 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 slave station device mounted on a moving body such as a vehicle and an AVM mounted on a ground facility or the like.
A master station device is provided, and communication using a single wireless line is enabled between the AVM slave station device and the AVM master station device.
The present invention relates to an AVM system that automatically displays the position of a moving object such as a vehicle on a display device attached to an AVM master station device.

[0002]

2. Description of the Related Art AVM (Automatic Vehicle Monitorin)
g) The system is usually called a vehicle position automatic display device, which can centrally control the position of a moving object such as a vehicle. It can be used effectively when managed by two fire departments.

FIG. 2 shows a conventional example of the AVM system. As shown in the figure, the AVM system includes a slave station facility 1 mounted on a mobile body such as a vehicle (for example, a fire engine) and a master station facility 2 installed on a ground facility (for example, a fire department). ing.

The slave station equipment 1 includes a radio 3 and an AVM slave station device 4. The AVM slave station device 4 includes an AVM operation unit 5 for inputting / outputting data and a handset 6 for talking. Is connected. Here, the AVM slave station device 4 includes a CPU 7 for operation control, a built-in timer 8 and a modem 9, and the CPU 7 performs a predetermined data conversion process based on an instruction from the AVM operation unit 5. Or controls data input / output processing via the modem 9 and the wireless device 3.

[0005] The master station equipment 2 includes a radio device 10 and an AVM master station device 11. The AVM master station device 11 is generally used for data input / output operations and selection of a slave station to communicate with. Communication desk (command table) 12 and telephone handset 1
3 and a display unit 14 for displaying the position of the mobile unit on which the slave station equipment 1 is mounted.

Here, the AVM master station device 11 includes a CPU 16 for operation control, a built-in timer 17 and a modem 18.
And a storage device 20. The CPU 16 calculates the position of each mobile unit based on the data received from each of the slave station equipments 1 and the predetermined data based on an instruction from the communication console 12. It executes conversion processing or controls data input / output processing via the modem 18 and the wireless device 10.

In the above-described AVM system, communication between the slave station equipment 1 and the master station equipment 2 is performed by a single wireless line via the wireless devices 3 and 10.

When data is transmitted from the slave station equipment 1 to the master station equipment 2, the slave station equipment 1 first inputs data using the AVM operation unit 5. Then, the CPU 7 of the AVM slave station device 4 sends the input data from the AVM operation unit 5 to the modem 9 together with the display time of the built-in timer 8, and the modem 9 converts the data into an MSK signal. Then, the signal converted by the modem 9 is output via the wireless device 3. On the other hand, in the master station equipment 2, when the radio device 10 receives the transmission from the slave station device 1, the AVM master station device 11 performs predetermined data conversion processing on the demodulated output of the radio device 10, and stores the data. Simultaneously with the transfer to the device 20, the contents of the received data are displayed on the display unit 14. When the AVM master station device 11 receives a transmission from the slave station device 1, the AVM master station device 11 transmits an ACK signal, which is an acknowledgment signal indicating that the AVM master station device 11 has received the signal, via the radio device 10. Output to equipment 1. The AVM slave station device 4 of the slave station equipment 1 has its AC
When the K signal is received, it is displayed on a display unit provided in the AVM operation unit 5 to complete a series of operations when transmitting from the slave station equipment 1 to the master station equipment 2.

The CPU 7 of the AVM slave station device 4 includes:
If the ACK signal cannot be received, a retransmission function is provided which repeats transmission processing based on a preset number of retransmissions (retry times) and a retransmission interval (retry) interval.

[0010] This retransmission function considers the case where radio waves are weak and cannot reach, or the case where a plurality of slave stations 1 execute transmission at the same time and a beat is generated in the wireless system to make communication impossible. It was done.

[0011]

The above-mentioned AVM
The system is based on the assumption that the slave station equipment 1 sequentially transmits each time a case occurs and notifies the master station equipment 2 of the situation in real time. Can not be connected in many cases. In such a case, the data is transmitted by the retransmission function described above.However, in order to prevent the data from being mistakenly recognized as old or new when the notification is delayed due to the retransmission, the transmission data is transmitted. The AVM slave station device 4 of each slave station equipment 1 is provided with a built-in timer 8 for the creation together with the case occurrence time.

However, in the conventional AVM system, A
The time adjustment of the built-in timer 8 provided in the VM slave station device 4 is as follows.
The operation is performed by manual operation from the AVM operation unit 5, and in order to make time management accurate, the operator of the slave station equipment 1 contacts the master station equipment 2 and the built-in AVM master station device 11 It is necessary to frequently perform the operation of adjusting to the display time of the timer 17 (for example, every day), and there is a problem that a great burden is imposed on the operator due to the time adjustment of the built-in timer 8 of the AVM slave station device 4. Was.

When a plurality of slave station equipments 1 exist,
There is a possibility that the display time of the built-in timer 8 may be slightly different for each slave station equipment 1.

The retransmission processing from the slave station equipment 1 is performed by A
This is achieved by the retransmission function provided in the CPU 7 of the VM slave station device 4. In the conventional case, the number of retries and the retry interval during the retransmission process are set in advance by operating the AVM operation unit 5.

Therefore, when there are a plurality of slave station equipments 1, different retry intervals are set for each slave station equipment 1 in order to prevent the plurality of slave station equipments 1 from repeating retransmission at the same timing. As described above, there is also a management inconvenience that the settings in each slave station facility 1 must be managed.

The retransmission function provided in the conventional AVM slave station device 4 simply repeats retransmission a predetermined number of times when an ACK signal cannot be received. Therefore, there is a problem that the occupation time of the radio wave increases, the communication environment further deteriorates, or the actual data transfer rate decreases.

The present invention has been made in view of the above circumstances, and in an AVM system, it is possible to reduce the time and effort required for adjusting the time of a built-in timer of an AVM slave station device, and to prevent an increase in radio wave occupation time due to retransmission processing. It is another object of the present invention to eliminate the need for management of a retry interval for preventing contention of retransmission timing due to coincidence of retry intervals between a plurality of AVM slave station devices.

[0018]

AVM according to claim 1
The system includes an AVM slave station device mounted on a mobile body such as a vehicle and an AVM master station device mounted on a ground facility or the like,
Communication between the AVM slave station device and the AVM master station device is made possible by using a single wireless line, and the position of a moving body such as the vehicle is automatically displayed on a display device attached to the AVM master station device.

Means for solving the problems are as follows: (1) The AVM slave station device transmits data to be transmitted.
(2) equipped with a data storage device for storing
Further, the retransmission provided in the CPU of the AVM slave station device
The communication function includes (3) that the AVM master station device has received
To monitor the ACK signal to be transmitted,
If the K signal cannot be received, stop the retransmission process and send
The time data indicated by the built-in timer at that time
Retry stop function to save in the data storage device together with
(4) When this retry cancel function is activated,
After that, monitor the ACK signal transmitted from the AVM master station device.
If an ACK signal is received,
Data stored in the data storage device by the abort function
A retry return function for sending the data to the AVM master station .

In the AVM system according to the second aspect, the contract
The AVM system according to claim 1, which is mounted on a vehicle or the like.
The CPU of the AVM slave device has a power supply for the AVM slave device.
It is started when the power is turned on and the calibration time
Data, and display the built-in timer of the AVM slave station device.
The time is added to the calibration time data sent from the AVM master station.
Equipped with a timer calibration function to calibrate based on.

[0021]

[0022]

[0023]

In the AVM system according to the third aspect, the contract
The AVM system according to claim 1, wherein (1) said AVM child
The station equipment is equipped with a random number generator.
And a retransmitter mounted on a CPU of the AVM slave station device.
(3) When the retransmission is repeated, the random number is generated.
To change the retransmission interval using random numbers generated by the
Equipped with lie interval adjustment function.

[0025]

[0026]

In the AVM system according to the first aspect, the other child
Competition with station equipment intensifies, making line connection to master station equipment difficult
Useless resend processing by retry cancel function
At the same time as the retry return function.
Retransmission can be achieved efficiently
Can greatly reduce the increase in occupation time of radio waves
become.

Further, in the AVM system according to the second aspect, when the power of the AVM slave station device is turned on , the AVM slave station device is turned on.
AVM parent by timer calibration function installed in CPU
A request for correction time data is made to the station device, and AVM
The time of the built-in timer of the slave station device is the same as that of the AVM master station device.
The time is automatically adjusted to the time of Ima. Therefore, AV
To adjust the time of the built-in timer of the M slave station device, the operator
Is no longer troublesome, and the burden on the operator is large.
Will be reduced. In addition, the time
Accuracy of synchronization is uniform, and multiple AVM slave station devices exist
To the same degree for any AVM slave station device
The time can be adjusted with the accuracy of
The reliability of management is also improved.

Further, in the AVM system according to the third aspect, since the retry interval is set at random by a random number, even if the initial transmission timing conflicts among a plurality of AVM slave stations, the retransmission timing is not changed. The transmissions to the AVM master station device can be completed with a smaller number of retries.

Therefore, it is possible to reduce the increase in the occupation time of the radio wave due to the retransmission processing, and at the same time, a plurality of A
It is possible to eliminate the need for managing the retry interval for preventing contention of retransmission timing between VM slave station devices.

[0030]

FIG. 1 shows an embodiment of an AVM system according to the present invention. AVM in this embodiment
As shown, the system includes a moving object such as a vehicle (for example,
It is composed of slave station equipment 23 mounted on a fire engine and a master station equipment 24 installed on a ground facility (for example, a fire station). In the system shown in FIG. 1, components having the same functions as those of the conventional system shown in FIG. 2 are denoted by the same reference numerals.

The slave station equipment 23 includes a radio 3 and an AVM slave station device 26. The AVM slave station device 26 includes an AVM operation unit 5 for inputting / outputting data and a handset 6 for talking. Is connected. Here, the AVM slave station device 26 is equipped with a data storage device 28 for storing data to be transmitted and a random number generator 29 in addition to the CPU 27 for operation control, the built-in timer 8 and the modem 9. Have been.

The CPU 27 has the AVM.
A function of executing a predetermined data conversion process based on an instruction from the operation unit 5 or controlling a data input / output process via the modem 9 and the wireless device 3 is provided as in the related art. Is equipped with a timer calibration function 31, and a retransmission function 32 for performing retransmission when an ACK signal from the AVM master station device cannot be received is greatly improved. The timer calibration function 31
It is started when the power of the VM slave station device 26 is turned on, requests calibration time data from the AVM master station device, and displays the display time of the built-in timer 8 of the AVM slave station device 26 with the calibration time sent from the AVM master station device. Calibrate based on data.

Further, the retransmission function 32 sets the number of retries and the retry interval in the AVM operation unit 5 as in the conventional case.
In addition to the settings that can be set from, a retry stop function 34, a retry return function 35, and a retry interval adjustment function 36 are provided as auxiliary functions for efficient retransmission.

Here, the retry stop function 34 monitors the ACK signal transmitted in order to indicate that the AVM master station device has received the signal when the transmission is performed, and if the ACK signal cannot be received, This is a function of stopping the retransmission processing and storing the data to be transmitted in the data storage device 28 together with the time data indicated by the built-in timer 8 at that time (that is, the time of the first transmission processing).

When the retry stop function 34 is activated, the retry return function 35 operates after the AVM.
The ACK signal transmitted from the master station is monitored,
When a signal is received, the data stored in the data storage device 28 is converted to AVM data by the retry cancel function.
This is a function to send to the master station device.

The retry interval adjusting function 36 is a function for changing the retransmission interval every time using the random number generated by the random number generator 29 when retransmission is repeated. Specifically, the transmission data of the slave station equipment 23 is normally received by the master station equipment 24, the ACK signal from the AVM master station apparatus of the master station equipment 24 is received by the AVM slave station apparatus 26, and a series of transmissions is performed. The standard time required to complete the operation normally is T
(This T is a value proportional to the data length.) When the value of the random number generated by the random number generator 29 is N, the retry interval adjustment function 36 sets T × N as the retry interval.

Whether or not to use each of the above functions 34, 35, 36 can be designated by an operation from the AVM operation unit 5, and in one embodiment, the retry interval adjusting function 3
When the ACK signal cannot be received even after the retransmission process is executed a predetermined number of times at the retry interval set by the control unit 6, the retry stop function 34 and the retry return function 35 are used.

Next, the master station equipment 24 will be described. As shown, the master station equipment 24 is connected to the radio 10 and the AV device.
The AVM master station device 38 includes a communication console (command table) 12 for data input / output operation and selection of a slave station to communicate with, and a handset 13 for talking. And a display unit 14 for displaying the position of the mobile body on which the slave station equipment 23 is mounted.

Here, the AVM master station device 38 includes a CPU 39 for operation control, a built-in timer 17 and a modem 18.
And a storage device 20. The CPU 39 calculates a position of each mobile unit based on data received from each of the slave station equipments 23, and performs predetermined data processing based on an instruction from the communication console 12. It executes conversion processing or controls data input / output processing via the modem 18 and the wireless device 10. Further, when the above-mentioned timer calibration function 31 requests the calibration time data from the AVM slave station device 26, the CPU 39 supplies the built-in timer 17 to the CPU 39 at that time.
Is provided with a calibration time notification function 40 for transmitting the time instructed by the user.

In the above-described AVM system, when the power is turned on to the AVM slave station device 26, the CPU 27 is reset to an initial setting state, and the timer calibration function 31 is automatically started to request calibration time data. Is output to the AVM master station device 38. In this case, the command for the calibration time data request generated by the CPU 27 is converted into an MSK signal by the modem 9 and output to the wireless device 10 of the master station facility 24 via the wireless device 3. Data is transmitted and received between the wireless devices 3 and 10 using a single wireless line system. The CPU 39 of the AVM master station device 38
Upon detecting a request for calibration time data from the AVM slave station device 26 via the wireless device 10 and the modem 18, the above-described calibration time notification function 40 is automatically activated, and the built-in timer 17
, The current time is read out, converted into MSK signal by the modem 18 as the calibration time data, and output to the wireless device 3 of the slave station equipment 23 via the wireless device 10. Then, the CPU 2 of the AVM slave station device 26 is transmitted from the wireless device 3 through the modem 9.
When the calibration time data is notified to 7, the timer calibration function 31 calibrates the display time of the built-in timer 8 of the AVM slave station device 26 to the time data notified from the AVM master station device 38.

As described above, the built-in timer 8 of the AVM slave station device 38 automatically operates the built-in timer 8 of the AVM slave station device 38 by the timer calibration function 31 of the AVM slave station device 26 and the calibration time notification function 40 of the AVM master station device 38. It is adjusted to the built-in timer 17. Therefore, the operator does not have to bother to set the time of the built-in timer 8 of the AVM slave station device 26.
The burden on the operator is greatly reduced. Also,
The automation has standardized the accuracy of time setting,
When the VM slave station device 26 is present, the time can be adjusted with the same level of accuracy for any of the AVM slave station devices 26, so that the reliability of the time management is improved.

Next, the processing at the time of actual data communication will be described. When transmitting data from the slave station equipment 23 to the master station equipment 24, the slave station equipment 23
Enter data using. Then, the CPU 27 of the AVM slave station device 26 sends the input data from the AVM operation unit 5 to the modem 9 together with the display time of the built-in timer 8, and the modem 9 converts the data into an MSK signal. Then, the signal converted by the modem 9 is output via the wireless device 3.

On the other hand, in the master station equipment 24, when the radio 10 receives the transmission from the slave station equipment 23, the AVM master station device 38 performs a predetermined data conversion process on the demodulated output of the radio equipment 10. , Transferred to the storage device 20,
The content of the received data is displayed on the display unit 14. When the AVM master station device 38 receives the transmission from the slave station device 23, the AVM master station device 38 sends an ACK signal, which is an acknowledgment signal indicating that the AVM master station device 38 has received, via the radio device 10. Output to the equipment 23.

Then, the AVM slave station device 2 of the slave station equipment 23
When the ACK signal is received, the ACK signal is displayed on a display unit provided in the AVM operation unit 5, thereby completing a series of operations when transmitting from the slave station equipment 23 to the master station equipment 24.

The reference numeral 42 in FIG.
The operation procedure in the case where the AVM slave station device 26 receives the ACK signal from No. 8 and the series of operations is completed normally is indicated by arrows connecting the components.

In the case of the above-described embodiment, the retransmission function 32 provided in the AVM slave station device 26 sets the number of retries and the retry interval in advance in the If the ACK signal cannot be received later, the transmission process can be repeated based on a preset number of retries and a retry interval.

Reference numeral 43 in FIG.
An operation procedure when retransmission processing is repeated according to a preset number of retries and a retry interval is shown. In this illustrated example, after executing the first transmission S1, retransmission (R1 to R4 in the figure) is repeated four times, and in the fourth retransmission, an ACK signal is transmitted from the AVM master station device 38. The signal could not be received by the wireless device 3 of the slave station equipment 23, and ended abnormally. The retry interval when performing retransmissions R1 to R4 is always constant.

As described above, when retransmission is repeated many times, the retransmission processing increases the occupation time of radio waves and further intensifies competition with other slave station equipment 23, thereby further deteriorating the communication environment. There is a possibility that it will happen.

Therefore, in the above-described embodiment, the retry stop function 34, the retry return function 35, and the retry interval adjusting function 36 are provided to prevent such deterioration. Reference numeral 44 in FIG. 3 indicates each of these functions 34, 35, 3
6 shows an operation procedure in a case where the retransmission is executed by operating No. 6. In the illustrated example, the retry is attempted only once at the retry interval set by the retry interval adjusting function 36, and when the ACK signal cannot be received, the processing is entrusted to the retry stop function 34 and the retry return function 35. Next, the operation conditions of the respective functions 34, 35 and 36 are initialized.

After the first transmission S2 is executed, retransmission (r1 in the figure) is executed only once at the retry interval set by the retry interval adjustment function 36, and the ACK signal cannot be received. Then, the data to be transmitted is stored in the data storage device 28 together with the time data, and the retransmission processing is stopped.

When the subsequent transmission S3 is normally received by the AVM master station device 38 and the ACK signal for the transmission S3 at that time is detected by the AVM slave station device 26, the retry recovery function 35 The data stored in the storage device 28 is read and retransmitted (r2). When the ACK signal transmitted from the AVM master station device 38 is received in response to the retransmission r2, the fact is displayed on the AVM operation unit 5 and the data storage device 28
The data stored in is deleted.

As described above, when the retry canceling function 34 and the retry returning function 35 are used, useless repetition of the retransmission processing can be eliminated. Can be reduced.

The retry interval adjusting function 36 without operating the retry canceling function 34 and the retry returning function 35
Thus, retransmission can be repeated a preset number of times. FIG. 4 shows a case of such an operation. In the illustrated example, three retransmissions are repeated after the first transmission S4, but the retry intervals t1, t2, and t3 until the next retransmission are calculated using the random numbers generated by the random number generator 29. In both cases, different values are used. For example, the transmission timing of the first transmission
Even in the case of competing with the transmission of the slave station device 26, the timing of retransmission is very unlikely to conflict with another AVM slave station device 26, and the AVM master station device 3 can be retried with a smaller number of retries.
8 can be completed, the increase in the occupation time of radio waves due to the retransmission processing can be reduced, and at the same time, competition of retransmission timing among a plurality of AVM slave station devices is prevented. The trouble of managing the retry interval is not required.

[0054]

As is apparent from the above description, in the AVM system according to the first aspect, competition with other slave station equipment is achieved.
If it becomes difficult to connect the line to the master station equipment,
When transmitting from places where radio waves do not reach the master station,
B) Canceling unnecessary retransmission processing by cancel function
At the same time, efficient retransmission by retry return function
Can be achieved when the radio wave is occupied by the retransmission processing.
It is possible to greatly reduce the increase during the period.

Further, in the AVM system according to the second aspect, when the power of the AVM slave station device is turned on , the AVM slave station device is turned on.
AVM parent by timer calibration function installed in CPU
A request for correction time data is made to the station device, and AVM
The time of the built-in timer of the slave station device is the same as that of the AVM master station device.
The time is automatically adjusted to the time of Ima. Therefore, the claim
In addition to the effect equivalent to the AVM system of Item 1, the AVM child
The operator manually adjusts the time of the built-in timer of the station equipment.
Troubles the operator, greatly reducing the burden on the operator.
Will be reduced. In addition, time adjustment by automation
Accuracy is standardized, and there are multiple AVM slave station devices.
In this case, the same level of accuracy is
Time can be set at different times,
Also, the reliability of the system is improved.

In the AVM system according to the third aspect, since the retry interval is set at random by a random number, the same effect as the AVM system according to the first aspect is obtained.
Te, even if the first transmission timing conflict between multiple AVM slave stations, the timing of the retransmissions may be different from one another, also possible to terminate the transmission to the AVM master station with a smaller number of retries become.

Therefore, it is possible to reduce the increase in the exclusive time of the radio wave due to the retransmission processing, and at the same time, to use a plurality of A
It is possible to eliminate the need for managing the retry interval for preventing contention of retransmission timing between VM slave station devices.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a configuration of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a conventional AVM system.

FIG. 3 is an operation explanatory view of one embodiment of the present invention.

FIG. 4 is an operation explanatory view of one embodiment of the present invention.

[Explanation of symbols]

 3,10 radio 5 AVM operation unit 6,13 handset 8,17 built-in timer 9,18 modem 12 communication console 14 display unit 20 storage device 23 slave station equipment 24 parent station equipment 26 AVM slave station equipment 27,39 CPU 28 data Storage device 29 Random number generator 31 Timer calibration function 32 Retransmission function 34 Retry stop function 35 Retry return function 36 Retry interval adjustment function 38 AVM master station device 40 Calibration time notification function

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04B ⁷ /24-7/26 H04L 1/00 H04L 1/08-1/24 H04L 29/00-29 / 12 H04Q 7/00-7/38

Claims (3)

(57) [Claims] An AVM slave station device mounted on a mobile body such as a vehicle and an AVM master station device mounted on a ground facility or the like, wherein a single wireless communication is provided between the AVM slave station device and the AVM master station device. An AVM system for enabling communication using a line and automatically displaying the position of a moving object such as a vehicle on a display device attached to an AVM master station device, wherein data to be transmitted is provided to the AVM slave station device. Save
A data storage device for storing the data, and a retransmission device provided in the CPU of the AVM slave station device.
The transmission function includes A which is transmitted to indicate that the AVM master station device has received the signal.
The ACK signal is being monitored and the ACK signal cannot be received.
If it does not, stop the retransmission process and
At the same time, the data is recorded together with the time data indicated by the built-in timer.
The retry stop function to save in the storage device, and when this retry stop function is activated, A
When monitoring the ACK signal transmitted from the VM master station device,
When the CK signal is received, the retry stop function
Therefore, the data stored in the data storage
An AVM system comprising a retry return function for sending to a master station device . 2. The AVM system according to claim 1 , wherein the CPU of the AVM slave station device mounted on a vehicle or the like includes the CPU.
AVM master station device that is started when the power of the VM slave station device is turned on
Requests the calibration time data from the AVM slave station device.
The display time of the built-in timer is sent from the AVM master station.
An AVM system comprising a timer calibration function for performing calibration based on the calibration time data . 3. The AVM system according to claim 1, wherein said AVM slave station device is provided with a random number generator, and further comprising a retransmitter provided in a CPU of said AVM slave station device.
The retransmission function includes a random number generated by the random number generator when retransmission is repeated.
Retry interval adjuster that changes the retransmission interval using the number
An AVM system that is equipped with a Noh function .