JPH0629897A - Polling method in mobile radio system - Google Patents

Abstract

PURPOSE:To efficiently allocate cars by adding data of a start number and the number of time slots to a polling signal and transmitting it. CONSTITUTION:After executing a data collection from (n) sets of mobile stations, a data collection by the portion of an (n)-set is executed from the mobile stations of AN+n-1+1 during the next idle time. By repeating this operation, the data collection is repeated at every (n) set and always updated to the latest data. When the data collection of mobile stations A1-Am is executed by polling from a base station B, data of a polling start number N and the number (n) of time slots are added to a polling signal and transmitted, thereby the data collection can be executed from (n) sets of mobile stations in the order of the car number from an arbitrary mobile station A. In such a way, since the number of mobile station groups for deriving a polling answer can be set arbitrarily, by utilizing effectively a free time of the station B, the data collection is executed with high frequency from each mobile station, and can be updated to the latest data. As a result, by grasping a state of the mobile stations, a vacant taxi rate is reduced, and cars can be allocated efficiently.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile radio system, such as a taxi radio system, for connecting a base station and a plurality of mobile stations with a single radio line to make a call or data transmission. Regarding the polling method in.

[0002]

2. Description of the Related Art AVM is one of the mobile radio systems of this kind.
There is a system called (Automatic Vehicle Monitoring) system. This system, as illustrated in FIG. 5, includes a plurality of mobile stations A1 mounted on a moving body such as a taxi.
~ Am is connected to a base station B installed in a taxi distribution center by a single wireless line, and the current position of the taxi in the base station wireless area 1 and the actual vehicle status (whether there are passengers or not) ) And the like are collectively managed by the base station B.

In the semi-automatic simple AVM system, each mobile station A1 is called in response to a call from the base station B by voice or the like.
The operators Am to Am perform key operations for data transmission by themselves, and transmit data such as the vehicle position and the actual vehicle status to the base station B.

On the other hand, as shown in the time chart of FIG. 6, when the base station B issues a polling signal P consisting of bit synchronization, frame synchronization, data type, check bit, etc., each mobile station A1 to Am. Base station B in order of vehicle number
A system for transmitting a polling response signal 2 and transmitting data has been put to practical use.

That is, since each mobile station A1 to Am has its own number of time slots TS for transmitting data to the base station B after receiving the polling signal P set in its own microcomputer, Each mobile station A1 to Am
Automatically polls in a preset order by sending a polling response when its own time slot arrives.
Data is transmitted one by one.

[0006]

By the way, each mobile station A
To efficiently allocate 1-Am and reduce empty time,
It is necessary to collect data such as the current position of each mobile station A1 to Am as often as possible and the actual vehicle status, update the data to the latest data, and always grasp the current status accurately.

However, according to the conventional method, the mobile station A1
If the number of ~ Am is very large, from the start of polling until all mobile stations finish data transmission,
It takes a long time. For example, if there are m mobile stations, A1 to Am, time slots TS1 to TSm and a long time are required.

Therefore, polling cannot be started unless there is a coherent time, and it is impossible to efficiently collect data by utilizing a slight free time. As a result, the frequency of data update decreases, and it becomes impossible to accurately grasp the current status of each mobile station.

On the other hand, for example, if data can be collected during a no-call period by interlocking with a microphone press in a base station, the idle time can be efficiently used and the frequency of data collection can be increased. Also, since voice communication is unlikely to continue for a long time, if data can be collected using the time between voice communication, voice communication and data collection will be mixed and will be performed alternately.
Data can be collected frequently by efficiently using time.

For this purpose, it is necessary to freely and easily change the polling time so that a large number of mobile stations can be divided into vehicle number groups and polled in group units.

The technical problem of the present invention is to pay attention to such a problem, and by making it possible to arbitrarily change the polling time at the time of starting polling, it is possible to collect data from each mobile station efficiently and frequently. Is to

[0012]

FIG. 1 is a diagram for explaining the basic principle of a polling method in a mobile radio system according to the present invention. According to the method of the present invention, in a mobile radio system in which a base station B and a plurality of mobile stations A1 to Am are connected by a single radio line and a call or data transmission is performed, the base station B to each mobile station A1. When the polling signal P is transmitted to ~ Am, the polling start number N and the time slot number n are designated and transmitted.

[0013]

Since a number is set to each mobile station A1 to Am, when the number N of the mobile station that starts polling is transmitted together with the polling signal, the mobile station AN corresponding to the designated number N polls. The response starts. Then, when the data transmission of the mobile station AN ends, the data transmission is automatically performed from the mobile station of the next number A N + 1.

Since one time slot corresponds to the data transmission time required for one mobile station, the number n of time slots is designated to change the number of vehicle stations from the Nth mobile station AN to the nth vehicle number group. You have requested data transmission. Therefore, data is continuously transmitted from the Nth mobile station AN to the A N + n-1 mobile station in the order of the vehicle number.

In this way, after collecting data from n mobile stations, in the next free time, the operation of collecting data for n mobile stations from A N + n-1 + 1 mobile stations is repeated. , Data collection can be repeated for every n units to constantly update the latest data.

Therefore, as in the conventional case, by freely setting the number n of data to be collected by one-time polling, even if there is not enough time to collect data from all the mobile stations A1 to Am, It becomes possible to grasp the latest data by making effective use of the time of fine cut.

[0017]

EXAMPLES Next, examples of practical implementation of the polling method in the mobile radio system according to the present invention will be described. FIG. 2 is a block diagram showing an embodiment of a mobile radio system for implementing the polling method of the present invention, where B is the base station side and A is one mobile station.

First, the base station B will be described. A receiving device 3 for receiving a signal from a mobile station, a speaker 4 for reproducing a voice signal received by the receiving device 3, and a transmitting device for transmitting a signal to the mobile station. 5 and a microphone 6 for converting voice into an electric signal and supplying the electric signal to the transmitting device 5.

Further, a microcomputer 7 for controlling the base station B, an input / output interface 8 for connecting the microcomputer 7 to the receiving device 3 and the transmitting device 5, information on the mobile station such as a vehicle number, and a microcomputer. A memory 9 for storing programs executed by the computer 7 and supplying the programs to the microcomputer 7 is provided.

Further, the operating device 10 connected to the microcomputer 7 for the operator to input a command for operating the base station B, and the state of the base station B (reception state, transmission state) by a signal from the microcomputer 7. Switching device 11 for switching the state), display 12 for displaying the state of the mobile station, and the like, and antenna 1 for transmitting and receiving signals
Equipped with 3.

The normal operation of this apparatus will be described.
At the time of transmission, the switching device 11 is switched to the transmitting device 5 side by the control signal from the microcomputer 7, and a voice signal from the microphone 6 or various data signals from the microcomputer 7 is transmitted from the antenna 13 to the mobile station A. To be done.

At the time of reception, the switching device 11 is switched to the receiving device 3 side by the control signal from the microcomputer 7, and the signal from the mobile station A is received. The signal from the mobile station A includes a voice signal and a data signal, and the microcomputer 7 detects a data discrimination signal included in the signal received from the mobile station A to distinguish between them.

As a result, in the case of the data signal, the microcomputer 7 controls the receiving device 3 to operate the mute circuit, for example, so that the data signal is not reproduced from the speaker 4. Also, by processing the data signal,
It is recorded in the memory 9 and displayed on the display 12.

The mobile station A side basically has the same structure as the base station B, and is different from the base station B only in that the display 12 is not provided. The parts corresponding to the configuration of the base station B are denoted by the same reference numerals, and the operation thereof is the same as that of the base station B.

FIG. 3 is a time chart exemplifying the operation when polling is performed by the method of the present invention in this apparatus. In the case of the present invention, the polling signal P transmitted from the base station B includes data of the polling start number N and the number of time slots n in addition to bit synchronization, frame synchronization, data type, check bit and the like.

Here, the data type indicates that this signal is polling data, the polling start number indicates the vehicle number N to respond in the first time slot TS1 of the polling response, and the time slot n is , The number of time slots for polling responses, that is, the number of polling responses obtained from the mobile station with vehicle number N in the vehicle number order.

Now, when the polling signal P is transmitted from the base station B to all the mobile stations A1 to Am, the first time slot TS is transmitted from the mobile station AN corresponding to the polling start number N.
During 1, a polling response is made and data is sent. Then, when the data transmission is completed, in the next time slot TS2, the data transmission is performed from the (N + 1) th mobile station A N + 1. Similarly, the time slot TS3,
In TS4 ..., N + 2nd, N + 3rd ... mobile station A
Data is transmitted from N + 2, A N + 3 ....

Assuming that the polling start number N = 6 and the number of time slots n = 7 in this time chart, the mobile station A6 of vehicle number 6 is in the time slot TS1.
From the mobile station A7 of the vehicle number 7 in the time slot TS2. Similarly, polling responses are made in the order of vehicle numbers, and data is transmitted from the mobile station A12 having the vehicle number 12 in the nth time slot TS7, and the data collection is completed.

As described above, in response to the polling signal P, the polling of a total of n vehicle number groups from the mobile station having the vehicle number N to the mobile station having the number N + n-1 is completed. When polling next, set polling start number N to N + n-1
If you set +1, you can start polling from the next car number. It goes without saying that the number n of data to be collected does not have to be constant and can be freely changed.

In order to perform the operation shown in the time chart of FIG. 3 in the apparatus of FIG. 2, the polling start vehicle number N is input while the operating device 10 of the microcomputer 7 on the base station B side of FIG. When the number of time slots n is input, a signal including data such as the set polling start vehicle number N and the number of time slots n is added to the polling signal P of FIG. 3 via the microcomputer 7 and the transmitter 5. It is simultaneously transmitted to each mobile station A1 to Am.

On the other hand, the microcomputer 7 of each of the mobile stations A1 to Am has a function of detecting the polling start vehicle number N from the received polling signal P, a time slot counter and a time slot timer for counting the number of time slots. Is equipped with.

Next, a program executed by the microcomputers 7 of the base station B and the mobile stations A1 to Am for the polling response process will be described with reference to the flowchart of FIG. It is assumed that the polling start vehicle number N = 6 and the number of time slots n = 7.

The mobile stations A1 to Am are in a receiving state so that they can receive the signal from the base station B at any time. Now, when the polling signal is received in step S1, the response vehicle number initial value N (6 in the embodiment) is set in the microcomputer 7 of each mobile station A1 to Am in step S2. In addition, the time slot = 1 is set in the time slot counter, and the time slot TS
At 1, the time slot timer starts timing.

When the response timing arrives at step S3 due to the start of the time slot timer, at step S4, each mobile station A1 ...
At Am, the polling response vehicle number N is compared with the vehicle number of the own vehicle. Then, in step S5, a polling response is made and data is transmitted from the mobile station A6 whose own vehicle number corresponds to the polling response vehicle number N = 6.

On the other hand, even if the response timing comes, the step
In the mobile station in which polling response vehicle number N = 6 does not match its own vehicle number in S4, 1 is added to polling start vehicle number N to set 7 in step S6, and the time slot counter is also set to 1. It is added up to 2.

As a result, in step S7, since the value of the time slot counter is not n = 7, the process returns to step S2, the response vehicle number initial value N + 1 (7 in the embodiment) is set, and the time slot counter is set. Counter = 2 is set. Then, at time slot TS2, the time slot timer starts counting, and when the response timing arrives at step S3, the mobile station A7 with the vehicle number N + 1 = 7 updated at step S6 is detected, and the polling response is automatically made. Is done.

In the meantime, in step S6, 1 is added again to set the vehicle number 8 for the next polling response,
And the time slot 3 is set by the time slot counter. When the mobile station A12 whose vehicle number is 12 is detected by repeating such operations, a polling response is sent from the mobile station A12, and the step
Since the time slot counter in S7 is n = 7, the series of polling responses is completed in step S8.

The polling start vehicle number N and the time slot number n are arbitrarily set in the base station B, and the operating device 10
Since it is possible to input from, the number of time slots n is set to be small when polling is performed by using the finely divided time. When there is sufficient free time, or when the operator of the base station intentionally polls, by increasing the number of time slots n, data can be continuously collected from many mobile stations.

[0039]

As described above, according to the present invention, the base station B
When collecting data of each mobile station A1 to Am by polling from the mobile station, by sending the polling signal with the data of the polling start number N and the time slot number n, the data is transmitted from any mobile station AN in the order of vehicle number. Data can be collected from n mobile stations.

As described above, since the number of mobile station groups for which polling responses are requested can be arbitrarily set, the idle time in the base station B can be effectively used to collect data from each mobile station at a higher frequency. It becomes possible to update to the latest data. As a result, it is possible to always accurately grasp the current situation at each mobile station, reduce the vacancy rate, and perform efficient vehicle allocation.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a basic principle of a polling method in a mobile wireless system according to the present invention.

FIG. 2 is a block diagram illustrating a configuration of a base station and each mobile station for implementing the polling method of the present invention.

FIG. 3 is a time chart showing an embodiment of a polling method of the present invention.

FIG. 4 is a flowchart showing a polling response process of a microcomputer of each mobile station.

FIG. 5 is a conceptual diagram showing a mobile radio system called an AVM system.

FIG. 6 is a time chart showing a conventional polling method.

[Explanation of symbols]

 B Base station A, A1 to Am Mobile station P Polling signal 1 Base station wireless area 2 Polling response signal TS time slot 3 Receiver 5 Transmitter 7 Microcomputer 10 Operating device 11 Switching device 12 Display N Polling start number (polling start vehicle No.) n number of time slots

Claims (1)

[Claims] 1. A mobile radio system for connecting a base station (B) and a plurality of mobile stations (A1) to (Am) by a single radio line to perform a telephone call or data transmission. Polling signal from B) to each mobile station (A1) to (Am)
When transmitting (P), a polling start number (N) and a number of time slots (n) are designated and transmitted, and a polling method in a mobile radio system.