JPS636698A - Avm system - 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] [Technical Field of the Invention] This invention uses a polling method to sequentially send a plurality of mobile stations mounted on a plurality of vehicles distributed from a base station to a plurality of areas from a base station. The present invention relates to an AVM system that collects information from each mobile station.

[Technical background of the invention and its problems] In order to monitor multiple vehicles, such as delivery rates and taxis, from a central base station, each vehicle is equipped with a wireless device and serves as a mobile station. This is an AV system in which the base station collects information about each mobile station by calling a wireless device using a polling method and sending information back from the called mobile station to the base station.
Various M systems have been developed.

In such an AVM system, in order to efficiently monitor the status of each mobile station, the area to be monitored is divided into multiple areas, a different time slot is assigned to each area, and the time slots are used. An AVM system that collects information for each district has been disclosed in, for example, Japanese Patent Laid-Open No. 58-21932.

This conventional AVM system adopts a method in which the time slot for returning data from a mobile station is variably set depending on the number of mobile stations in each area, or the time slot for returning data is variably set for each time zone. However, this type of system does not take into account the efficiency of each district, that is, the efficiency of vehicle allocation. More specifically, some districts have a low dispatch frequency and others have a high dispatch frequency, but for districts with a high dispatch frequency, polling from the base station is conducted more frequently in order to accurately collect the latest information without delay. In addition, for areas where vehicle allocation is infrequent, it is considered that polling from the base station may be low in accordance with the low frequency. However, in the above-mentioned conventional AVM system, the number of times of polling per unit time is exactly the same regardless of whether the frequency of vehicle allocation is high or low, since the frequency of vehicle allocation for each district is not taken into account. For this reason, there is a problem in that necessary information cannot be accurately collected from areas where vehicle dispatch is frequent, and vehicle dispatch efficiency cannot be improved.

[Purpose of the invention]

This invention was made in view of the above, and its purpose is to accurately collect necessary information even from areas with high frequency of vehicle dispatch by varying the number of polling times according to the frequency of vehicle dispatch in each district. The purpose of the present invention is to provide an AVM system with improved vehicle allocation efficiency.

[Summary of the invention]

In order to achieve the above objective, the base station sequentially calls multiple mobile stations mounted on multiple vehicles distributed in multiple areas using a polling method and collects information from each mobile station. In the AVM system, as shown in FIG. 1, the present invention calculates the frequency of vehicle dispatch for each district in the frequency calculating means 1 based on the number of times vehicles are dispatched to each district from the base station, and The gist of the present invention is to vary the number of times of polling per unit time for each district according to the frequency of vehicle allocation for each area, using the polling number variable means 3.

[Embodiments of the invention]

Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 2 is a block diagram of a base station device used in an AVM system according to an embodiment of the present invention. The base station device shown in the figure is, for example, a device that monitors movement 8 (not shown) consisting of a wireless device mounted on each of a plurality of delivery vehicles, but in this case, the area where each vehicle is dispatched is is divided into multiple districts, and vehicles are distributed to each district. This base station device has an antenna 11, uses this antenna 11 to sequentially call a plurality of mobile stations in a polling manner, and receives various information from each mobile station.
For example, the current location information of the vehicle is collected. The antenna 11 is connected to a transmitter 15 and a receiver 17 via an antenna duplexer 13. The antenna duplexer 13 is a switch for sharing the antenna 11 for transmitting and receiving radio waves.

The transmitter 15 transmits polling signals from the base station to each mobile station, and the receiver 17 receives transmission signals from the mobile stations. The transmitter 15 and receiver 17 are connected to a transmission control device 21 via a modem 19. The transmission control device 21 controls the entire transmission and reception operation of this base station device, and the modem 19 converts the signal from the transmission control device 21 into the signal format of the transmitter 15, and also converts the signal from the receiver 17. This is a device that converts the signal into the signal format of the transmission control device 21. The transmission control device 21 is an input/output (Ilo)
It is connected to the display device 25 and the input device 27 via the control device 23 to control the display on the display device 25, that is, the display device 2
5 and processes input signals from the input device 27, such as a vehicle dispatch flow input signal input by a vehicle dispatch operator at the base station.

The transmission control device 21 also includes a polling frequency control device 2.
9 is connected. This polling number txt device 29 is a device that performs a processing flow shown in FIG. 3, which will be described later, and changes the number of polling times per unit time for each district in accordance with the vehicle allocation frequency.

The polling frequency control device 29 also includes an I10 control device 2.
Input signals from the input device 27 are supplied through the input device 27 through the input device 27, and in order to calculate the vehicle dispatch frequency in the polling frequency control device 29, the vehicle dispatch flow input signals from the input device 27 are counted and each district is The number of times each vehicle is dispatched is measured, and the frequency of vehicle dispatch for each district is calculated from this number of dispatches. Then, the number of times of polling for each district, that is, the number of intervals for collecting information for each district, is determined according to the frequency of vehicle allocation, and the number of times of polling is controlled to be increased in areas where the frequency of vehicle allocation is high.

The base station device also has a microphone 33 and a speaker 37 with a microphone press switch for voice communication, and these microphones 33 and speakers 37 are connected to the modem 19 and the receiver 17 via audio path switches 31 and 35, respectively. and each audio bus switch 31.
35 is controlled by the transmission 11J Ill device 21, so that it is possible to communicate with each mobile station by voice under the control of the transmission control device 21.

Next, according to the processing flow shown in Fig. 3, and from Figs. 4 to 6,
The operation of the AVM system having the base station apparatus shown in FIG. 2, particularly the control in the polling frequency control device 29, will be explained with reference to the drawings.

In FIG. 3, the polling frequency control device 29 first sets initial values necessary for the following processing, then counts the input signals from the input device 27, and calculates the number of times n vehicles are dispatched for each district.
1 (i indicates the i-th district, ni indicates the number of dispatches for the i-th district) (step 210.22
0>. Then, the counted number of dispatches ni for all districts is summed up (Σni), and it is checked whether this total value Σold is equal to a predetermined value N. If the total value Σni of the number of vehicle allocations has not reached the predetermined value N, the process returns to step 220 and continues counting until the total value Σni of the number of vehicle allocations reaches the predetermined value N. When the total value Σni reaches a predetermined value N, the process proceeds to step 240, and based on the counted number of dispatches, that is, the dispatch frequency, the polling cycle for each district, that is, the predetermined value N divided by the number of dispatches ni for each district, is determined. Calculate the value ΣN/ni for each district.

Now, as shown in FIG. 4, the areas monitored by the base station device are nine districts A, B, C, D, E, F, .

Assume that the area is divided into H and I, and as a result of counting the number of vehicle allocations as described above, the number of vehicle allocations ni for each area is as shown in the table shown in FIG. That is, each district A, B,
The counting results ni of the number of dispatches for C, D, E, F, G, H, and I are 6, 5°, 4.3, and 2.1, respectively. O, O,
O, and the total, that is, the above predetermined value N, is 21 (N
= 21), the polling cycle for each district ΣN/n
As shown in FIG. 5, i is 3.5; 4.2:5.
2 Near: 10.5:21 It's going to be ni ni ni. In addition,
"-" means that the number of dispatched vehicles is 0 and therefore cannot be calculated.

Then, the polling period ΣN/n calculated in this way
When i is rounded up to the nearest whole number, the period shown at the bottom of FIG. 5 is 4:5:6; 7:11:21. This number means that, for example, in the case of district A, it is necessary to poll once every four times, and in the case of district B, it is necessary to poll once every five times.
This means that polling is performed twice.

After calculating the polling cycle for each district in this way, the polling order for each district is determined according to the polling cycle, that is, the polling priority order (step 250). This polling ranking becomes higher as the polling period calculated as described above is smaller.

FIG. 6 is a table in which the polling order is determined for the above-mentioned example. As shown in Figure 6, the area with the highest polling priority, that is, the smallest polling cycle of 4, will be polled once every four times, so the column with priority 1 will be polled. They are allocated as shown in . In this allocation to district A, polling rank "21" is omitted and is combined with the first rank of the next cycle, as shown in (A), because district A is the first polling cycle in the next polling cycle.

In addition, district B, which has the second priority, is allocated once every five polls starting from the next polling rank "2" after district A, and is indicated in the priority "2" column.

However, since polling rank 17 overlaps with the polling operation of district A, the next rank is "18" as shown by 8 from (B). Other districts C, D, E
, F are similarly allocated below. Priority “7”
”, as mentioned above, the area A-F where the vehicle was dispatched
After determining the polling order for District G, the vehicle was not dispatched to a location for which no polling order was set.

H and I are to be allocated as appropriate.

In this manner, the polling operation for each district can be set for the 21 polling order slots according to the vehicle allocation frequency of each district. After calculating the polling order in this way, the counted number of dispatches ni is reset to zero (step 260), the process returns to step 220, and the process is repeated in the same manner.

The predetermined value N (-21) in the above embodiment is used to determine the overall polling cycle, and by setting a large value N, it is possible to set the number of polling times with less bias.

In the above embodiment, the polling cycle for each area is calculated based on the number of dispatched vehicles to determine the polling ranking, but the relative cycle of each area is measured and based on this relative cycle, the polling ranking is determined to be extremely high. In order to prevent this, for example, it is possible to set a balanced number of polling by weighting the calculation period so that there is no unbalance such as an extremely large number of polling only in district A.

[Effects of the Invention] As explained above, according to the present invention, the vehicle dispatch frequency is calculated for each district, and the number of polling times per unit time for each district is varied according to the vehicle dispatch frequency. For example, by increasing the number of times of polling per unit time for areas where vehicle dispatch is frequent, the latest information required can be accurately obtained even in areas where vehicle dispatch is frequent, so accurate vehicle dispatch can be carried out efficiently and quickly. For example, operators no longer have to take the time to dispatch vehicles as in the past.

[Brief explanation of the drawing]

FIG. 1 is a claim correspondence diagram of the present invention, FIG. 2 is a block diagram of a base station device of an AVM system showing an embodiment of the present invention, FIG. 3 is a flowchart showing the operation of the device in FIG. 2, and FIG. 6 to 6 are explanatory diagrams relating to district division, number of vehicle allocations, polling period, etc., for explaining the operation of the apparatus shown in FIG. 2. 1... Frequency calculation means 3... Polling number variable means 29... Polling number control device. Agent Patent Attorney Yasuo MiyoshiFigure 1Figure 83Figure 4Figure 5Figure 6

Claims (1)

[Claims] In an AVM system, the base station sequentially calls multiple mobile stations mounted on multiple vehicles distributed in multiple areas using a polling method to collect information from each mobile station. Frequency calculating means for calculating the vehicle dispatch frequency for each district based on the number of times vehicles are dispatched to each district, and varying the number of times of polling per unit time for each district according to the vehicle dispatch frequency for each district. An AVM system characterized by polling frequency variable means.