JPH0226893B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses polling from a base station to
In a vehicle dynamic display device that collects empty car data from dynamic data of mobile stations (wireless taxis, etc.) and displays it on a display device such as a CRT, based on which the base station issues a dispatch command, the polling time is The present invention relates to a response order setting method in a mobile station that prevents interference while reducing the time period as much as possible.

In general, a distributed transmission method is mainly adopted as a method for detecting vehicle dynamics for wireless taxis.
As shown in Figure 2, the business area is divided into several to several + blocks A, B, etc., and sign posts a, b, etc. (small transmitters) are placed in the center of each divided block A, B, etc. Set. When vehicle 1 enters point A1 of area A from outside the business area, it memorizes the position group signal from the nearest sign post a, and even if it passes point A2, it retains the position group signal of area A for a certain period of time. do. Next, when moving to point B1 in another district B, the memory of the position group signal of the previous sign post a is erased and the position group signal of the new sign post b is stored. In this way, each time the vehicle 1 moves, the position group signals of the nearest sign posts a, b, . . . are stored in the vehicle 1. Here, when a vehicle allocation order is received, a polling signal specifying the area is emitted from the base station, and the vehicles 1 in the area send back their vehicle number and dynamic data (vacant vehicle, rental vehicle, forwarding, etc.). The base station receives this information, displays it, and issues a dispatch order from there. When the vehicle 1 leaves the business area from point B2, the stored position group signal is erased at point C1 after a certain period of time.

As described above, when polling is performed by specifying the relevant area, vehicles within the relevant area will return vehicle numbers and dynamic data, but there are many vehicles in the relevant area. If these respond all at once, signal collision will occur, and the base station will not be able to obtain correct information. As a countermeasure for this, as shown in Fig. 1, in response to the polling signal, for example, each group of 10 vehicles (10n+1), (10n+2), etc. has a unique response time ( _t0~1 , t _{1 to 2} ,...) to avoid signal collision (interference) due to simultaneous calls.
is prevented.

However, one response time (time slot)
Even if polling takes 0.3 seconds, for example, if there are 30 time slots, polling will take about 10 seconds, and during busy times, multiple vehicles with the same response time, or the same time slot, will gather in the same area, resulting in interference. There were problems such as unavoidable problems.
Furthermore, if the response order is fixed, vehicles with earlier ranks (time slots) will be given a vehicle dispatch order, making it impossible to issue an average vehicle dispatch order.

The present invention has been made to solve the above-mentioned problems, and when a vehicle dynamic data, for example empty vehicle data, is collected by polling, when a vehicle enters a specific area, the sign of the area is collected. When a position group signal from a post is received, a timer is operated by AND outputting the position group signal and the signal when the taximeter becomes empty, and the time that the vehicle is waiting in the area is counted. However, as this waiting time approaches a preset reference time, the priority of the time slot for responding to polling from the base station increases step by step, and as the waiting time passes the reference time, the priority of the time slot increases. so that it gradually decreases,
The priority order of time slots is determined. Since taxis often become rented within 2 to 4 minutes after entering a certain area, priority should be given to taxis with a waiting time of 3 minutes and 15 seconds first.
If the waiting time is shorter than that, the ranking is set at finer time intervals. If 5 minutes or more have passed, the number of empty vehicles has decreased due to dispatch orders, etc., so even if the time interval for setting the rankings is made longer, interference will hardly occur. By using the method described above, the polling time can be greatly shortened, and the amount of collected effective data can also be increased.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

First, the basic idea of the present invention will be explained based on FIG. The horizontal axis in FIG. 3 shows the waiting time T in a certain area. During this waiting time T, when a car enters a certain area A with an empty car, the position group signal of sign post a of that area A is received, and the waiting time T starts from that time. When entering the taxi, the waiting time T starts when the taxi meter becomes empty. The vertical axis indicates response priority. In most cases, even if a taxi is empty in a certain area, it will be available for hire within 2 to 4 minutes. Therefore, in the example shown in Figure 3, the waiting time T is 3.
Minutes 15 seconds T ₀ is set as the standard time, and when the waiting time is shorter than that, the priority setting interval for responses to polling signals is set to finer time intervals, for example, 15 second intervals, and when the waiting time is longer than the standard time, Set the priority setting interval from 15 seconds to 30 seconds, 1 minute, 2
Increase the length sequentially, such as minutes, 3 minutes, etc. The response priority order is the standard time of 3 minutes 15 seconds, followed by 3 minutes 30 seconds, 3 minutes, 4 minutes, 2 minutes 45 seconds, and 4 minutes 30 seconds.
Seconds, 2 minutes and 30 seconds, 5 minutes, etc., are set alternately on the left and right, centering on the reference time. A certain amount of waiting time T (for example,
After 15 minutes), there are almost no empty cars, so prioritize the cars with the shortest waiting time.

As described above, as the waiting time approaches the preset reference time, the priority of the time slot for responding to polling from the base station increases step by step, and as the waiting time passes the reference time, the priority of the time slot increases gradually. Since the priority order of time slots is determined so that the priority order decreases in stages, by setting the reference time appropriately, it is possible to efficiently collect an effective amount of data (empty cars) in a short time. This makes it possible to allocate an average number of vehicles to all vehicles.

FIG. 4 is a block diagram of an apparatus implementing the method of the invention. In FIG. 4, 1 is a mobile station, 2 is a base station, and 3 is a sign post for each district.

The mobile station 1 is connected to the antenna 4 of the sign post 3.
It is equipped with an antenna 5, a receiver 6, and a data demodulator 7 for receiving the position group signal emitted from the station.
The data demodulator 7 is also coupled to a timer reset circuit 9, a gate 10 and a dynamic data generation circuit 11 in the controller 8. The taximeter 12 is connected to the timer reset circuit 9 and the dynamic data generation circuit 11, and the timer reset circuit 9 is connected to the time slot setting circuit 1 via the timer 13.
4 is combined. The output side of this time slot setting circuit 14 is coupled to the dynamic data generating circuit 11 via the gate 10, which closes after a certain period of time after the position group signal from the sign post 3 can no longer be received. A vehicle number setting circuit 15 is connected to the input side of the dynamic data generation circuit 11 and is configured to set a vehicle number for each vehicle using a switch. The output side of this dynamic data generation circuit 11 is coupled to an antenna 18 for transmitting and receiving to the base station 2 via a data modulator 16 and a transmitter 17.
A microphone 19 is coupled to the . Also coupled to the antenna 18 is a receiver 20 for audio signals and polling data signals from the base station 2, the audio signals being sent to a speaker 21 and the data signals being sent to a data demodulator 22. This data demodulator 22 is coupled to the dynamic data generation circuit 11.

The base station 2 is provided with a receiving antenna 23 and a transmitting antenna 23a for communication with the mobile station 1. Of these, the receiving antenna 23 is coupled to a display device 25 such as a CRT via a receiver 24, and the transmitting antenna 23a is connected to a polling transmitter 26.
The polling transmitter 26 is connected to an operation section 27, which includes a keyboard and performs operations such as specifying a district.

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

Assuming that the taxi 1 has entered the receiving area of a certain area, it receives the position group signal of the sign post 3, demodulates this data, and sends the signal to the timer reset circuit 9, gate 10, and dynamic data generation circuit 11. send. If the car enters the area with an empty car, the signal from sign post 3 is received, and if the car becomes empty after entering the area,
When the taximeter 12 becomes empty, the timer reset circuit 9 is activated and the timer 13 counts a new waiting time. Time slot setting circuit 14
In this case, the response priority level increases gradually as the time difference (T to T _{0 ) between the waiting time T counted by the timer 13 and the preset reference time T 0 (} for example, 3 minutes and 15 seconds) becomes shorter. Prioritize time slots for responding to polls. That is, as shown in FIG. 3, when the waiting time T is shorter than the reference time _T0 , the time slot setting circuit 14 sets the reference time _T0 at fixed time intervals (for example, 15 seconds).
Set a ranking of multiple stages (for example _{, 13} stages ₎ divided by A ranking is set for each set time interval (for example, 15 seconds, 30 seconds, 1 minute, 2 minutes, 3 minutes, etc.), and the ranking is determined by the rank where the waiting time T is closest to the reference time T ₀ ( 1) in the diagram
is defined as the first priority response order, and hereafter, the order in which the waiting time becomes shorter than the reference time (3, 5, 7, 9, etc. in the figure) and the order in which it increases in the direction (2, 2 in the figure) 4, 6, 8,...) are set by alternately lowering the ranking. To be more specific, as shown in Figure 3, the waiting time T
A mobile station 1 whose time slot is between 3 minutes and 3 minutes and 30 seconds closest to the reference time _{T 0} is assigned a first priority whose time slot corresponds to t ₀ to _{t 1} in FIG. Mobile station 1 whose waiting time T is between 3 minutes and 30 seconds and 4 minutes is assigned a second priority order whose time slot corresponds to t ₁ to _{t 2} in FIG. For mobile station 1 whose time is between 2 minutes 45 seconds and 3 minutes, the time slot is t ₂ in Figure 1.
A third priority corresponding to ~t ₃ is assigned,
For mobile station 1 whose waiting time T is between 4 minutes and 4 minutes and 30 seconds, the time slot is between t ₃ and t ₄ in FIG.
_For mobile station 1, which is assigned a fourth _priority corresponding to
For mobile station 1, which _is assigned a _fifth priority corresponding to A sixth priority is assigned, and so on.

Here, by operating the operation unit 27 at the base station 2,
Emit a polling signal that specifies a specific area.
For example, as shown in Figure 5a, this polling signal has 100 bits for data start, 8 bits for data confirmation, and 4 bits for specifying mode (empty car, rental run, forwarding, etc.), and can be set as necessary. 2 bits for setting polling order, 16 bits for district code, 4 bits for checking
Consists of bits. This polling signal enters the antenna 18 of the mobile station 1, is received by the receiver 20, demodulated by the demodulator 22, and sent to the dynamic data generation circuit 11. In the mobile station 1, when the area designation by the polling signal and the position group signal from the sign post 3 match, the mobile station 1 selects the time slot set by the time slot setting circuit 14, that is, the dynamic data generation circuit 11 with the above priority order. From there, the dynamic data of the vehicle, mainly car number data and empty car data, are transmitted from the antenna 18 via the data modulation circuit 16 and the transmitter 17. The data signal of this mobile station 1 is as shown in FIG. 5b.
It consists of 100 bits for data start, 8 bits for data confirmation, 4 bits for mode specification, 16 bits for district code, 12 bits for car number, and 4 bits for check. This data signal is received by the dynamic data receiver 24 via the antenna 23 of the base station 2, and the vehicle number and dynamic status are displayed on the display device 25. At this time, since each mobile station 1 sends back data signals based on the response order shown in FIG. 3, the vehicle numbers are displayed on the display device 25 in order according to the response order. The base station 2 issues a vehicle dispatch command based on these data.

In the embodiment, the waiting time T varies from 0 to the reference time.
The time difference up to T ₀ is set constant, and when it exceeds the reference time T ₀ , it increases logarithmically; however, the present invention is not limited to this. good.

As described above, as the waiting time approaches a preset reference time, the priority of the time slot for responding to polling from the base station increases step by step, and the waiting time passes the reference time. Since the priority of the time slots is determined so that the priority of the time slots gradually decreases over time, interference caused by simultaneous calls from mobile stations can be reduced by setting the reference time appropriately. This can be prevented, and an effective amount of data (empty cars) can be collected efficiently in a short period of time. Additionally, polling time is greatly reduced, and dispatch commands can be issued evenly to all vehicles.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of time slots during conventional polling, Figure 2 is an explanatory diagram of the distributed transmission method, and Figure 3 is an explanatory diagram of time slots during conventional polling.
FIG. 4 is an explanatory diagram of response priority setting, FIG. 4 is a block diagram for implementing the method according to the present invention, and FIG. 5 is an explanatory diagram of polling signals. 1... Mobile station, 2... Base station, 3... Sign post, 9... Timer reset circuit, 11... Dynamic data generation circuit, 12... Taximeter, 13
...Timer, 14...Time slot setting circuit,
15...Car number setting circuit, 25...Display device, 26
...Polling transmitter.

Claims (1)

[Scope of Claims] 1. In a device in which dynamic data of a mobile station is collected by polling from a base station, a position group signal of signposts in a predetermined area received by the mobile station and the mobile station A timer is activated by a signal when the vehicle becomes vacant to count the waiting time of the mobile station in the area, and as this waiting time approaches a preset reference time, it responds to polling from the base station. The priority order of the time slots is set such that the priority order of the time slots for the purpose of processing increases step by step, and as the waiting time passes the reference time, the priority order of the time slots decreases step by step. A response order setting method in a mobile station characterized by: 2. When the waiting time is shorter than the reference time, the order of the time slots is a multi-level order divided by the reference time at fixed time intervals, and when the waiting time is longer than the reference time, the waiting time and the reference time are ranked. The priority of the time slots is determined by assigning the waiting time closest to the reference time as the first priority response priority. Hereinafter, the response in the mobile station according to claim 1, wherein the priority order is set by alternately lowering the priority order in the direction in which the waiting time becomes shorter than the reference time and the priority order in the direction in which it becomes longer. How to set rankings.