JPS60196043A - Monitor method for car movement - Google Patents

Abstract

PURPOSE:To collect many data as soon as possible by providing a time slot to each of plural mobile stations and at the same time varying these time slots in response to the polling purpose. CONSTITUTION:When a taxi 1, i.e., a mobile station enters a reception range of an area A, the position group signal of a signpost (a) is received by a receiver 13 through an antenna 12 and demodulated by an area signal decoder 17 to be sent to a central signal processing circuit 19 as well as to an answer data generating circuit 18. If a polling signal is transmitted from a base station 2, the mobile station 1 receives the polling signal by a receiver 14 through an antenna 16 and discriminates the polling signal received by a decoder 21. Then the station 1 responds successively to all cars including the first car through the last one in the order of a proper time slot setting circuit 25 in a group designation mode. In a total mode of all cars, the data having the time variation of a timer 28 is added to a proper time slot. Thus a time slot is set. As a result, the superposition of time slots can be avoided by superposing the polling frequencies in a total polling mode of all cars.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides a system in which, when a base station sends a polling signal to a plurality of mobile stations, a time slot is provided for each of the plurality of mobile stations to allow for a time difference in responses. The present invention relates to a vehicle dynamic monitoring method in which radio waves do not overlap, in which the time slot is varied depending on the purpose of polling.

[Prior Art and Problems] Conventionally, as vehicle dynamic monitoring methods particularly targeting taxis, (1) a semi-automatic method (manual setting method) and (2) a distributed transmission method are known.

(1) As shown in FIG. 1, the business area of semi-automatic taxis is divided into several to several tens of blocks (A), (B), etc., and numbers are assigned to each block. When a customer orders a ride, the base station presses a button for the corresponding area. Then, a district-specific polling signal is emitted.

This signal is received by all mobile stations (taxi radios), but among them, if the driver presses the district button, it also matches the polling signal, and the car is empty, the signal is received by the mobile station. The vehicle number is called. The base station receives this information, displays it, and issues a dispatch order from there.

(2) Distributed transmission method As above, the business area is divided as shown in Figure 1, and sign posts (a) (b)... (small size transmitter). When vehicle (1) enters point (A1) of district (A) from outside the business area, the position from the nearest sign post (a)? f
Even if we memorize f, (l″i outside and pass through point (A2),
The location group signal of district (A) is maintained as it is. next,
When moving to point (B1) in district (I3) of another sign post (b), the memory of the position group signals of the previous sign post I to (a) is erased, and the digit 16 group signal of the new sign post (b) is erased. remember. In this way, each time the vehicle (1) moves, the nearest sign post (a) (
Store the position group signal of b). Here, the dispatch order is 6-
1, when the base station sends out a polling signal specifying the area, the vehicles (1) in that area send back their car numbers and dynamic data (vacant cars, rental cars, forwarding, etc.).

The base station receives this information, displays it, and issues a dispatch order from there. When the vehicle leaves the business area from point (B2), the memorized position information will be returned after a certain period of time (for example, 1 minute).
(C1) Erase at point.

As shown in 2 below, if you specify the relevant area and poll, vehicles in the relevant area will return their vehicle numbers and movement data.
There are many vehicles in the area.

If these respond all at once, signal collision will increase, and the base station will not be able to receive correct information.

As a countermeasure against this problem, a method has been adopted in which a time slot I- is provided and a response is made for each group.

For example, in the case of 50 taxis, 10 time slots 1 are provided and the taxis are divided into 5 groups. As shown in FIG. 2, first, the first group designating polling signal causes the slots (1) from number 1 to number 10 in the first group to be selected in numerical order. .11~2,・ Be thoughtful and considerate. When the first group is completed, taxis (1) numbered 11 to 20 of the second group respond in numerical order according to the tie j\slot 1- by a polling signal designated by the second group. Thereafter, dynamic data of all vehicles is collected in the same manner. This is a commonly used method for preventing signal collision (interference) caused by simultaneous calls. Note that since 16 time throwers are normally provided, the time from polling to completion of response for each group in this case is about 7 seconds, and if you want to collect data for 480 taxis, or 30 groups, it will take 210 seconds = This will take a long time of 3 minutes and 30 seconds.

However, when it is desired to collect data on only empty vehicles within a specific area as quickly as possible, polling in such a group-designated all-dynamics data collection mode takes too much time. Also, polling that specifies several groups is also useful, but it is not possible to know how many vehicles in that group are in the area.
There is no guarantee that you will get the data you need. Specifically, in the simultaneous polling of all vehicles using Mo1-, in Figure 3, if a vehicle in a certain area (A) is marked with a double circle, and one of them is empty or type 1 light, then the circle is jlt without
Polling will be performed sequentially for both. Therefore, a method has been adopted in which, knowing that radio waves overlap in some time slots 1-, a response is made using only time slot 1- regardless of the group. Specifically, the third
In the figure, car No. 1.11.21.31.41 goes to the same time slot 1, 2,]2.22.32.42 goes to the same time slot l-1...
Car No. 5, car No. 25, and car No. 25 overlap each other in the same time slot, but car numbers and empty car data can be collected for cars No. 22 and No. 9 with a single poll.

Here, for example, even though four vehicles are required, two
If data can only be collected from cars, it is first necessary to dispatch cars No. 22 and No. 9, and then collect empty car data for the same area. There was no way to salvage it.

[Object of the Invention] An object of the present invention is to provide a device that can collect a large amount of data as quickly as possible by changing the time slots 1 to 1 depending on the purpose of polling.

[Summary of the Invention] In a method for sequentially collecting dynamic data of each mobile station at a base station based on polling from the base station, a time slot set in a unique order for each mobile station and In this method, a time slot of a new rank is set based on the time data to be output, and a response is made using that time slot. For example, if a separate timer is provided for the time data output by each mobile station, the last digit of that timer is used every time polling is performed, and the time data is randomly calculated by the sum or product of this time and the unique time slot 1-. A ranking time slot can be generated.

[Embodiment of the Invention] An embodiment of the method according to the present invention will be described with reference to the drawings. In FIG. 5, (2) is a base station, and this base station (2) is connected to a central controller (3), a communication controller (4), a transmitter/receiver (
5) to the transmitting/receiving antenna (6), and the central controller (3) is connected to the CRT display section (7), printer (8), recording section (9), command section (10), etc. has been configured.

Next, (1) is a mobile station such as a taxi, and this mobile station (1) is a sign post (a) (b)... Antenna (1■
) is equipped with an antenna (12) and a signpost receiver (13) for receiving position group signals from a base station (2).
a receiver (14) that receives a polling signal from the mobile station (1), a transmitter (15) that transmits the response signal and data signal of the mobile station (1) to the base station (2), and these transceivers (14) (
15) and an antenna (1G) coupled to the antenna.

A district signal decoder (17) is coupled to the output side of the sign post receiver (13), and this district signal decoder (
17) is coupled to a response data generation circuit (18) and a central signal processing circuit (19). Further, the response data generation circuit (18) is coupled to the transmitter (15) via a response delay circuit (20). The receiver (14) includes:
the central signal processing circuit (19) via the decoder (21);
) and a time slot switching circuit (22).

The central signal processing circuit (19) includes a taxi meter (23) that outputs an empty car signal and a car number setting switch circuit (2).
4) are combined. (25) is a unique time slot setting circuit that sets a unique time slot for each vehicle, and this unique time slot setting circuit (25) is directly connected to one input side of the time slot switching circuit (22). , is coupled to the other input side via an arithmetic circuit (26). A timer (28) activated by a start switch (27) is coupled to this arithmetic circuit (26).

Next, the operation of the above configuration will be explained.

Assuming that a taxi (1), which is a mobile station, comes within the reception range of a certain district (A), the position group signal of the sign post (a) enters the antenna (12) and is transmitted to the sign post receiver (13). ) and sends this signal to the district signal decoder (
17), and the signal is demodulated by the central signal processing circuit (19).
) and is sent to the response data generation circuit (18).

Here, a polling signal is sent from the base station (2),
When entering the antenna (16) of the mobile station (1), the receiver (1)
4) and sent to the decoder (21). Specifically, as shown in Figure 4, the polling signal from the base station (2) includes a prefix bit synchronization signal, a frame synchronization signal (data reception confirmation signal), and a mode signal (all-army empty vehicle collection mode and Group-designated all-dynamics collection mode, etc.), polling designation signals (district polling, district expansion polling, vehicle number designation polling, etc.), data signals (designated district data and vehicle number data, etc.), group data signals, correction signals ( It consists of a check pit). Therefore, the received polling signal is either a group-specified all-dynamics data collection mode that specifies the time slot and group, or an all-army-Qi empty vehicle data collection mode that specifies only the time slot and does not specify the group. is determined by a decoder (21), and an output corresponding to each mode is generated. In the group designation mode, responses are made sequentially from the first vehicle to the last vehicle according to the order of the unique time slot setting circuit (25). Therefore, there is no data collection failure or radio wave overlap.

When in All-Army-Union mode, even though the time-varying data of the timer (28) is added to the unique time slot to set the time slot, two or more empty vehicles in the same time slot Overlapping radio waves occur when For example, assume that the first polling causes a signal collision between cars No. 1 and No. 21, as in the case of FIG. 3. However, at the second polling time, the last digit of the timer (28), such as minutes and seconds, is added to the unique time slot. It is almost impossible for the last digit of this timer (28) to match between cars No. 1 and No. 21, so the mobile station (1) in the order of the time slot with the smallest sum or product value responds first. , the mobile station (1) with the next largest time slot responds. In addition, the timer (2
By adding the last digit of 8), it is possible to collide with a mobile station (1) that has not collided before, but the number of unresponsive mobile stations (1) will gradually decrease, and Since the polling results in a different time slot again, it is possible to obtain the desired number of data by polling several times.

[Effects of the Invention] Since the present invention employs the method described above, even if data collection fails due to overlapping time slots during all-army simultaneous polling that requires only empty vehicle data, it will not be possible to collect data for the second or third time.
By increasing the number of times of polling, the time slots change and no longer overlap. Therefore, the required amount of data can be obtained by polling several times.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the distributed transmission system, Fig. 2 is an explanatory diagram of unique time slots, Fig. 3 is a diagram showing the relationship between time slots and group numbers, Fig. 4 is an explanatory diagram of polling signals, FIG. 5 is a block diagram of an apparatus for implementing the method of the invention. (1) Mobile station, (2) Base station, (3) Central controller, (5) Transmitter/receiver, (6) Antenna, (7) CRT display Part, (10)...Command part, (1,1)(12)...Antenna, (13)...Sign post receiver, (14)...Receiver, (]5)...
- Transmitter, (16)...Antenna, (18)...Response data generation circuit, (19)...Central signal processing circuit,
(21) Decoder, (22) Time slot switching circuit, (23) Taxi meter, (24)...
- Car number setting switch circuit, (25) - Unique time slot setting circuit, (26)... Arithmetic circuit, (28)...
Timer, (a) (b)...Sign post, (A) (
B)...district. Applicant: General Co., Ltd.

Claims (1)

[Claims] (1) In a method in which the base station sequentially collects dynamic data of each mobile station based on polling from the base station, each mobile station outputs the data in a time slot set in a unique order for each mobile station. A vehicle dynamic monitoring method characterized in that a time slot of a new rank is set based on data that changes over time, and a response is made using that time slot. (2. In claim 1, the time-varying data output by each mobile station consists of the last digit of the timer within the mobile station, and this last digit is added to the unique time slot. A vehicle dynamic monitoring method that sets a new time slot.