JP2001069064A - Mobile radio system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a base station to properly receive data by decreasing a collision probability of the transmission data. SOLUTION: In the mobile radio system where a plurality of mobile stations 2-1 to 2-n transmit information to a base station 1 as required and the base station 1 receives this information, the base station 1 is provided with a timing transmission means that transmits a timing signal being a reference of information transmission in the mobile stations 2-1 to 2-n and each of a plurality of the mobile stations 2-1 to 2-n is provided with a transmission control means 21A that makes information transmission in a timing on the basis of the timing signal when sending information to the base station.

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 an AVM system used for a taxi dispatch system.

[0002]

2. Description of the Related Art Conventionally, in order to notify the status of an actual vehicle and an empty vehicle in a taxi to a base station such as a taxi management center, the status of the actual vehicle and the empty vehicle changes at any time. It is superior to the polling method. FIG. 6 shows data transmission by an arbitrary calling method. In this example, mobile station A transmits data in the time slot indicated by t31, and in response, the base station
The response transmission to the above data transmission is performed in the time slot indicated by.

However, recent AVM systems have been
In order to perform position management by PS, it is necessary to transmit position data to the base station, in addition to the change of taxi status,
The data to be transmitted is increasing, and the opportunity for transmission is also increasing.

[0004] In such a situation, if each mobile station performs data transmission at an arbitrary timing by an arbitrary calling method, a collision of transmission data may occur in some cases, making it impossible to transmit appropriate data. Problems arise.

FIG. 7 shows an example in which the above transmission data collision occurs, in which mobile station A performs data transmission in a time slot indicated by 41 and mobile station B performs data transmission in a time slot indicated by 42. , The mobile station C is transmitting data in the time slot indicated by 43.

[0006]

However, 41,
The base station cannot properly receive all data due to the overlap between the time slots indicated by 42 and 43, and no response signal is returned from the base station as indicated by 44.

The present invention reduces the probability of collision of transmission data even in a mobile radio system employing the conventional arbitrary calling method as described above, and allows a base station to appropriately receive data from a mobile station. To provide a possible mobile radio system.

[0008]

In a mobile radio system according to the present invention, a plurality of mobile stations transmit information to a base station when required, and the base station receives the information. The station is provided with timing transmitting means for transmitting a timing signal serving as a reference for information transmission in the mobile station, and the plurality of mobile stations, when transmitting information to the base station, the timing signal Transmission control means for transmitting information at a timing based on. As a result, the data transmission timing is aligned in spite of the arbitrary calling method, so that in the event of a collision, collisions occur at exactly the same timing, and the collisions do not occur with slight deviations, and the probability of collision as a whole is reduced. Can be reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A mobile radio system according to an embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows the configuration of the mobile radio system. The base station 1 is arranged in a taxi office or the like, and the mobile stations 2-1 to 2-n are arranged in each vehicle.

The base station 1 is provided with an operation control device 11 for giving instructions for dispatching, etc. The operation control device 11 has a microphone 1 for inputting voice of a call.
2. The wireless device 13 and the main computer 14 are connected. The wireless device 13 communicates with each of the mobile stations 2-1 to 2-n via the connected antenna equipment 15.

The main computer 14 displays the position and the like of each vehicle, and performs processing for receiving a call instruction.
A keyboard / mouse 17 for inputting information, a printer 18 for printing, and a CD drive 19 for setting a CD (compact disk) storing programs and various data are provided.

The internal configuration of the operation control device 11 is as shown in FIG. That is, a terminal 32 for connecting the stand microphone 12 is provided on the information processing device 31,
4. The amplifier 35 is connected. Interface 3
The main computer 14 is connected to 3, and the wireless device 13 is connected to the interface 34. Amplifier 35
Is connected to a speaker 36 for sound generation.

On the other hand, since the mobile stations 2-1 to 2-n have the same configuration, only the mobile station 2-1 will be described. The mobile station 2-1 is provided with a communication control device 21 which receives GPS positional information and controls communication with the base station 1. That is, the car navigation device 22 and the wireless device 23 are connected to the communication control device 21. Further, the communication control device 21 has a taxi meter 24 provided with a switch for inputting the distinction between an actual vehicle and an empty vehicle, an information input device 25 for car navigation, an external input unit 26 for notifying an emergency or the like, and a voice input Microphone 27 is connected. Further, a GPS antenna 28 for communicating with a GPS satellite is connected to the car navigation device 22, and
AVM (Auto Vehicle Mon) for communicating with the base station 1
itor) Antenna 29 is connected.

In the above configuration, the car navigation device 22 is connected to the mobile station 2-1 via the antenna 28.
(The same applies to the other 2-2 to 2-n), and the position data is converted into predetermined format data together with the vehicle number information, the actual vehicle and empty vehicle state information, and the like in the communication control device 21. It is transmitted from the wireless device 23 to the base station 1 via the AVM antenna 29.

In the base station 1, the wireless device 13 receives the data via the antenna equipment 15 and sends it to the operation control device 11. The operation control device 11 separates the data and transmits the vehicle number information and the position data to the interface 33.
Via the main computer 14. The main computer 14 displays, for example, a map of an area covered by the taxi office on the display device 16 in which an image of the vehicle based on the position data is overlapped. At this time, the image of the vehicle is additionally displayed with a distinction between an actual vehicle and an empty vehicle, a vehicle number, and the like.

In order to perform a synchronization process at the time of the above communication, the information processing device 31 in the operation control device of the base station 1
As shown in FIG. 2, a timing transmission unit 31A for transmitting a base station control signal, which is a timing signal serving as a reference for information transmission in the mobile stations 2-1 to 2-n, is provided. As shown in FIGS. 4 and 5, the base station control signal is divided into time slots, for example, a predetermined pattern is arranged, and a time slot in which the mobile stations 2-1 to 2-n can transmit and a base station The time slot in which the response is transmitted can be distinguished.

On the other hand, a plurality of mobile stations 2-1 to 2-n include:
When transmitting information to the base station 1, a transmission control means 21A for transmitting information at a timing based on the base station control signal, which is the timing signal, is provided as shown in FIG. The transmission control unit 21A performs an operation according to, for example, a flowchart shown in FIG. 3, and thus the operation will be described.

First, it is detected whether data to be transmitted has occurred (S1). Here, when data to be transmitted occurs, a base station control signal is fetched from the wireless device 23 via the AVM antenna (S2), and the time slot pattern is checked to enable the mobile stations 2-1 to 2-n to transmit. The arrival of a time slot is detected (S3). When the arrival of the time slot is detected, data transmission is performed in synchronization with the start of the next time slot (S3).

FIG. 4 shows a state in which data is generated in mobile station A at time 51 and data transmission is performed in the next time slot. Also, in FIG. 5, data is generated at mobile stations A and B at times 61 and 62, and data is transmitted in the next time slot. At 63, data is generated at mobile station C,
FIG. 7 shows an example in which data transmission is performed in the next time slot, so that transmission can be performed in a time slot different from the data transmission of mobile stations A and B (an example shown in FIG. 7 in the conventional example). I have.

As described above, it is possible to avoid a situation in which information to be transmitted is generated one after another, and in the prior art, all transmission data are overlapped, and it is possible to reduce collision of arbitrary outgoing call data of the mobile station. In addition, the state of the mobile station can be monitored in real time, and the data collection efficiency can be improved while taking advantage of the arbitrary calling method.

Further, various information may be added to the base station control signal indicating the data transmission timing transmitted by the base station 1 as follows. For example, the number of waiting vehicles in each area, the waiting order of each mobile station,
The name of the area where each mobile station is registered (in the case of GPS-AVM, it is difficult for the mobile station to determine the name of the standby area from the latitude and longitude, so the base station determines and determines and notifies the base station) Arbitrary call conditions (instructions on what kind of change should be made to the state when a call should be made, and how long a moving distance or the like should be made in the GPS-AVM to make a call, and sets it in the mobile station. .) In contrast, mobile stations 2-1 and 2-2
-N receives the above information, displays the number of vehicles on standby in each area, the standby order of each mobile station, and the name of the area where each mobile station is registered, and confirms it by the driver. The base station collects only the data of empty vehicles or changes the moving distance in the GPS-AVM during busy times, so that the traffic of the arbitrary call data is generated. Can be controlled, so that it can be utilized as a more convenient AVM system.

[0022]

As described above, according to the mobile radio system of the present invention, a base station transmits a timing signal which is a reference for information transmission in a mobile station, and a plurality of mobile stations transmit information. When transmitting to the base station, the information is transmitted at the timing based on the timing signal, so that the data transmission timing is aligned even in the arbitrary calling system, and in the case of collision, exactly the same timing Therefore, the collision can be performed with little deviation, and the collision probability can be reduced as a whole, and the base station can appropriately receive data from the mobile station.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a mobile radio system according to an embodiment of the present invention.

FIG. 2 is a main part configuration diagram of the mobile radio system according to the embodiment of the present invention shown in FIG. 1;

FIG. 3 is a flowchart for explaining an operation of the mobile radio system according to the embodiment of the present invention.

FIG. 4 is an explanatory diagram showing data transmission timing in the mobile radio system according to the embodiment of the present invention.

FIG. 5 is an explanatory diagram showing data transmission timing in the mobile radio system according to the embodiment of the present invention.

FIG. 6 is an explanatory diagram showing data transmission timing in a conventional mobile radio system.

FIG. 7 is an explanatory diagram showing data transmission timing in a conventional mobile radio system.

[Explanation of symbols]

1 base station 2-1 and 2
-N mobile station 11 operation control device 12 stand microphone 13 radio 14 main computer 15 antenna equipment 16 display device 17 keyboard / mouse 18 printer 19 CD drive 21 communication control device 21A transmission control means 22 car navigation device 23 radio 24 taxi Meter 25 Information input device 26 External input device 27 Microphone 31 Information processing device 31A Timing transmission means

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5K067 BB26 BB36 CC04 DD25 EE02 EE10 EE22 EE72 JJ52

Claims (2)

[Claims] 1. A mobile radio system in which a plurality of mobile stations transmit information to a base station when required, and the base station receives the information, wherein the base station includes: Timing transmitting means for transmitting a timing signal, wherein the plurality of mobile stations include, when transmitting information to the base station, transmission control means for transmitting information at a timing based on the timing signal. A mobile wireless system, comprising: 2. The mobile radio system according to claim 1, wherein the timing transmitting means transmits a timing signal indicating a transmission time slot of information.