JPS5829015B2 - Mobile station information collection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention detects the location and status (empty, actual, working, waiting, etc.) of mobile stations (vehicles) that move within a certain range, such as taxis, buses, service cars, and patrol cars. This is for centrally monitoring and understanding wirelessly, and in particular relates to a mobile station information collection method that greatly reduces loss time during polling and enables rapid polling.

In recent years, for the purpose of rationalization and service improvement, mobile stations such as taxi buses, service cars, patrol cars, etc. have been increasingly monitored and dispatched by radio.

This type of monitoring and information gathering system, for example, defines a specific range, detects mobile stations within this range, and in the case of a taxi, for example, uses a radio telephone to know whether the vehicle is vacant or not, and then issues instructions for dispatching the vehicle. Do the following.

In such a system, it is required to monitor the status of a large number of mobile stations in a short period of time.

However, due to the nature of radio waves, if a large number of mobile stations transmit radio waves of the same frequency within the same service area, they will interfere with each other, making it difficult for the base station to distinguish between them.

For this reason, the following measures have been taken and put into practice.

(1) Distribute the reception stations of the base station and install many distributed reception stations), reduce the coverage area of each distributed reception station, and minimize the transmission power of the mobile station, or reduce the sensitivity of the distributed reception stations. To prevent radio waves transmitted by mobile stations within the area from causing interference in other areas.

(2) Mobile stations are polled one by one by the base station, and only the called mobile station responds and transmits information such as its own location and status.

(3) Polling is performed sequentially from the base station in a time-division manner by area or group, and each mobile station makes a call in response to the time slot assigned next to each poll.

However, method (1) requires a large number of dedicated distributed receiving stations and communication lines between the distributed receiving stations and the center in order to monitor mobile stations in a wide area, which has the disadvantage of increasing equipment and maintenance costs. .

In addition, in method (2), it takes 1 to 2 seconds for a normal radio device to poll a mobile station consisting of a base station and complete the response from that station, so it takes a long time when monitoring a large number of mobile stations. It takes.

Furthermore, although the method (3) makes it possible to shorten the required time (to 1/2 or less in the case of simple transmission) compared to the method (2), problems still remain.

In other words, in this method, a polling signal is sequentially transmitted from a base station for each district or group, and each mobile station determines whether or not there is a call based on this polling signal and a signal indicating its own district or group. When the own station corresponds to that area or group, a response signal is automatically transmitted to the base station.

This response is made in a time slot assigned to each mobile station within the district or group.

For example, if there are 1 to n mobile stations in one group, after polling from the base station as shown in Figure 1,
Sl, S2...Sm, So time slots are set.

and the first time slot S after polling
1, the time until the next time slot S2 is τ2, and then sequentially τ□, τ.

becomes. That is, after the base station has issued a hauling signal to one group, it must wait until the time slots Sl to Sn have elapsed to perform standby reception, and then poll the other groups.

Therefore, even if there are no mobile stations in the polled group in the area, you will have to wait for the above period as shown in Figure 1, which will result in a very large time loss. Become.

The present invention ameliorates these drawbacks by allowing each mobile station to respond to polling from the base station for each area or group using a common time slot, followed by individual time slots. The present invention provides a mobile station information collection method that immediately moves to polling of the next area or group when there is no response at all in the common time slot, thereby significantly reducing polling loss and realizing efficient monitoring.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows a mobile station information collection system according to the present invention, where 1 is a base station, 2 is a location group signal transmission station, and 3 is a mobile station of a vehicle such as a taxi.

The base station 1 transmits a polling signal for each district or group, and the mobile station 3 responds in response to the polling signal.

This response takes place in two types of time slots.

One of them is a common time slot S common to all mobile stations provided immediately after the polling signal is transmitted.

and the other one is a common time slot S.

Subsequently, individual time slots 8 provided in a time-division manner
1 to So.

Under such a premise, the operation will be specifically explained next.

First, the location group signal transmitting station 2 transmits a different location group signal a to a predetermined area for each area, and when the mobile station 3 enters each area, it receives the location group signal and stores it in memory.

On the other hand, the base station 1 transmits a polling signal corresponding to each district to each district.

Upon receiving this polling signal, the mobile station 3 uses the memorized location group signal to determine whether or not it is being called. It is transmitted to base station 1 in slot So.

The signal at this time does not necessarily include the station number signal of the mobile station.

When the base station receives a response for confirming the presence, it waits in a receiving state for the time period of the individual time slots 81 to So.

On the other hand, each mobile station 3 transmits an information signal including a station number to the base station 1 in a corresponding individual time slot based on predetermined conditions.

In this way, the base station 1 sequentially collects information from each mobile station.

When the collection of information on mobile stations in that area is completed, the base station 1 transmits a polling signal to the next area.

By the way, after sending the polling signal, the common time slot S.

If there is no response at all, the base station 1 immediately transmits a polling signal to the next district without waiting for the individual time slots 81 to Sn.

By collecting the above information, the base station 1 sends information on mobile stations in each area to the central processing unit 4, and displays the position of each vehicle, which is a mobile station, on the display device 5, for example.

More specifically, the mobile station 3 is configured as shown in FIG.

This mobile station 3 is provided with two receivers, a position group signal receiver 11 and a radiotelephone receiver 12, and a radiotelephone transmitter 13. The transmitting/receiving antenna 14 used is provided in the position group signal receiver 11, and the antenna 15 is provided in the position group signal receiver 11, respectively.

Further, 16 is a memory for storing the position group signal received by the position group signal receiver 11, 17 is a polling decoder for decoding the encoded polling signal received by the wireless telephone receiver 12, and 13 is the output of the memory 16. A determination circuit determines whether or not the local station is being called based on the output of the polling decoder 17, 19 is a circuit that delays the output of the determination circuit 18, and 20 is a station number generation circuit.

Also, the parts surrounded by dotted lines are for determining the priority of the response, 21 is the taxi meter, 22 is the counter, 23 is the taxi meter.
2 is a clock generation circuit, and 24 is a priority determination circuit.

In such a configuration, first, the position group signal from the position group signal transmitting station is received by the position group signal receiver 11, and then the position group signal is received by the memory 16.
to memory.

On the other hand, when a polling signal is transmitted from the base station 1, it is received by the wireless telephone receiver 12, and the polling decoder 1 receives the polling signal.
7 and leads it to the discrimination circuit 18.

The determination circuit 18 determines whether or not the own station is being called based on the location group signal from the memory 16 and the polling signal, and if it is the own station's call, an output is generated and presence confirmation is immediately sent via the wireless telephone transmitter 13. A response signal for the base station 1 is transmitted to the base station 1.

Further, a part of the output of the discrimination circuit 18 passes through a delay circuit 19, is delayed for a predetermined time, and is guided to the station number generation circuit 20.

As a result, the station number generation circuit 20 generates an output, and the radio telephone transmitter 13 transmits an information signal including the station number signal to the base station 1.

By the way, as a response to this polling, each mobile station responds to an individual time slot determined in advance in a time-division manner, but it is necessary to determine the response priority of each mobile station in accordance with this individual time slot.

Therefore, this configuration is as follows.

In other words, a taxi drops off a passenger and the taxi meter 21
When the taxi maker 21 is put out of use, a signal is generated from the taxi make 21, and the counter 22 starts counting upon generation of this signal.

This counter 22 operates based on a clock from a clock generation circuit 23.

The count result of this counter 22 is the priority determination circuit 2.
4, and the priority is determined by the count value.

For example, the priority is determined in accordance with a predetermined time so that a response can be made faster in descending order of the amount of time that has elapsed since the car became empty after passengers were dropped off, within a certain period of time.

The amount of delay of the delay circuit 19 will be determined in accordance with this priority signal. Therefore, each mobile station transmits an information signal at the time of the corresponding individual time slot in accordance with the above-mentioned priority.

Here, the response state of each mobile station 3 to polling will be explained with reference to FIG.

In FIG. 4, each group has 1 to n mobile stations, and correspondingly individual time slots 81 to So
is set, and before this time slot S1,
In other words, a common time slot S for confirming the presence immediately after transmitting the polling signal.

is set. In other words, when a polling signal is first sent from the base station 1 to the first group as shown in Figure 4a,
Each mobile station 1-1 belonging to that group (or district)
, 12, im, i n receives and confirms the presence of a common time slot S.

Make a response respectively. This is the state when the output of the discrimination circuit 18 directly enters the wireless telephone transmitter 13 and is transmitted.

When the base station 1 detects that there is a response for existence confirmation from even one station, the base station 1 enters a reception standby state for the time period 81 to Sn of each individual time slot.

During this standby, each mobile station 3 receives a time slot s according to the priority set as described above.

S2...An information signal including a station number is transmitted toward the base station 1 in a corresponding time slot of Sm and Sn.

The base station 1 detects this and collects information about the mobile station.

Thus the first group of time slots So, Sl
, S2...Sm, Sn elapse, the base station 1 transmits a polling signal to the second group.

In this way, the pot groups are polled in sequence, and when polling each group, a common time slot S is used to confirm the presence.

When there is no response from one station, base station 1 immediately transmits a polling signal to the next group, for example from the first group to the second group, without waiting for reception, as shown in Figure 4. .

Therefore, when there are no mobile stations belonging to the group,
The base station has each time slot S1 +S2...5r
11. There is no need to wait until the Sn time elapses, and the next group can be polled immediately.

This eliminates wasteful waiting time and makes it possible to significantly speed up the polling operation.

In addition, if the time slots are automatically shifted according to the priority determined by the waiting time etc. as described above, the center will not have to wait for all the time slots of the group, but will shift the time slots that the base station receives first. Vehicle dispatch instructions can be given to the station, further reducing the time required for dispatching vehicles.

In the embodiment, a location group signal transmitting station is provided in each district, and mobile stations that enter the area automatically store the location group signal in memory, but the user manually sets the location signal each time the district changes. You can do it like this.

It is also possible to set up groups in advance, instead of dividing them by district, and to respond when this group is polled and send location information.

Furthermore, the response priority is not limited to being changed depending on the state of the mobile station as described above, but may be determined by other methods, or may be fixed in advance.

As described above, according to the present invention, a time slot for presence confirmation is provided, and each mobile station first responds to this presence confirmation time slot when polling.
When there is no response to this presence confirmation, the base station immediately polls the next group (district) without waiting, thereby providing a mobile station information collection method that significantly reduces time loss during polling. can.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 a y b is a diagram showing the polling state according to the conventional mobile station information collection method, FIG. 2 is a diagram for explaining the mobile station information collection method according to the present invention, and FIG. The figure is a block diagram showing an example of the configuration of the mobile station in Figure 2, and Figure 4a.
, b are diagrams showing the state of polling according to the method shown in FIGS. 2 and 3. DESCRIPTION OF SYMBOLS 1... Base station, 2... Location group signal transmission station, 3... Mobile station, 4... Central processing unit, 5...... -Display device, 11...location group signal receiver, 12...wireless telephone receiver, 13...
... Radio telephone transmitter, 14, 15 ... Antenna, 16 ... Memory, 17 ... Polling decoder, 18 ... Discrimination circuit, 19・・・
... Delay circuit, 20 ... Station number generation circuit, 2
1... Taximeter, 22... Counter, 23... Clock generation circuit, 24...
...Priority determination circuit.

Claims (1)

[Claims] 1. A base station polls multiple mobile stations sequentially for each area or group, so that each mobile station in the area or group responds in a common time slot that is common to all mobile stations, and In a mobile station information collection system that responds in individual time slots according to predetermined conditions, if there is no response at all in the common time slot, the base station immediately moves to the next area without waiting for a response in the individual time slots. Alternatively, a mobile station information collection method is characterized in that it moves to group polling.