JPH06216824A - Mobile station information collecting method - Google Patents

Abstract

PURPOSE:To recognize whether a mobile station is included in a prescribed area or not with no waiting time required by providing a time frame for a common answer at the head of the answer signal received from the mobile station after a base station transmitted the vehicle search signal of a specific mobile station to all mobile stations. CONSTITUTION:The control center of a base station transmits at a time the vehicle search signals produced by an information processor 20 to the mobile stations mounted on the vehicles in a fixed area by a controller 30 in a signal form suited to a radio equipment. The mobile station mounted on a specific vehicle of a relevant area transmits an answer signal to the base station. The base station detects the presence or absence of both common and individual signals sent from the corresponding mobile station by an answer detecting part 10. Then the processor 20 decides the presence or absence of a vehicle that answered in the relevant area based on a fact whether an answer detection signal is received or not in a time frame for a common answer set at the head of the answer signal. Therefore the base station can know the presence or absence of an answered vehicle in a relevant area at the end of the preceding time frame. Then if the relevant mobile station is absent, the base station can produce the next vehicle search instruction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an AVM system (a system for collectively monitoring the movements of a plurality of moving vehicles at a base) used for dispatching taxis or issuing commands to fire engines. The present invention relates to a mobile station information collecting method in which a station efficiently collects information on each mobile station. In the above system, the base station uses the same wireless line (radio frequency) to make a voice call with each mobile station and collect / transmit information of each mobile station. It should be shortened as much as possible so that it does not interfere with normal voice calls.

[0002]

2. Description of the Related Art Conventionally, when collecting information of a plurality of mobile stations existing in a certain area in a base station, as shown in the block diagram of the time frame of each signal in the conventional system of FIG. In response to the search signal S, which is an instruction signal for all mobile stations in a certain area to search for a specific mobile station all at once, a fixed number (N units) is used as a response signal in which each mobile station responds to the base station. ) Minutes to respond, the base station waits for a response from each mobile station. Then, the specific mobile station instructed to respond by the base station responded in any time frame of the N individual response frames (1 to N). In this case, the base station does not know whether or not the corresponding mobile station exists in the area unless it waits until the time of the last response frame N of the response frames of all N mobile stations set in advance. It was

[0003]

Therefore, when there is no target mobile station that responds to the vehicle search signal S transmitted from the base station and the number of responding vehicles is zero, the vehicle type classification of the target mobile station is performed. The probe signal S is repeatedly transmitted many times, for example, by changing the target area or the adjacent area. However, in the above-described conventional method, the base station uses the preset mobile station each time. There is a problem that the entire response frame from the first response frame 1 to the last response frame N may be kept waiting for a certain time t. The object of the present invention is to eliminate the conventional long waiting time for waiting the response of the mobile station after the base station transmits a probe signal for searching a specific mobile station to a plurality of mobile stations, It is to provide a method of collecting mobile station information that allows the base station to immediately know the absence and give a next vehicle search instruction when there is no vehicle.

[0004]

The basic configuration of the present invention for attaining this object is the principle time of a search signal from the base station to the mobile station and a response signal from the mobile station to the base station in FIG. As shown in the principle diagram showing the configuration of the frame (timing), the response signal from the mobile station after the base station transmits a probe signal S to all mobile stations to search for a specific mobile station and to request a response At the beginning, a common response time frame (a) that can be written in order for the mobile stations to respond to to respond immediately at the same time is provided.After the common response time frame (a), the corresponding mobile station is Is N individually
It is configured to respond to the base station in any of the response frames 1 to N.

[0005]

In the present invention, the response time frame common to the relevant mobile station provided at the beginning of the response signal from the mobile station to the base station immediately after the probe signal S transmitted from the base station to all mobile stations. (a)
Then, since the corresponding mobile station can write "1" at once,
If there is no corresponding mobile station, the absence is known from "0" in the time frame (a) of the common response at the beginning of the response signal,
Immediately stop transmitting the search signal S by the method at that time,
The base station can immediately instruct the transmission of the search signal by the following method, and the N response frames initially set as the response frames from the mobile station after transmitting the search signal S in the conventional method. There is no longer the need to wait a long fixed time t until all of 1 to N have passed.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 2 is a block diagram of a mobile station, a base station and a command room of the embodiment, and FIG. 3 is an embodiment of the present invention, in which a base station transmits a probe signal to a plurality of mobile stations all at once. An example is shown. In the base station / command room of the embodiment shown in FIG. 2, the controller 30 makes a signal format suitable for a wireless device to generate a search signal generated by the information processing device 20, and a vehicle in a certain area from the wireless device. The search signal S is transmitted all at once to the on-board mobile stations. A particular vehicle-mounted mobile station existing in the area transmits a response signal to the base station. The base station receives the response signal from the mobile station by the radio and detects the presence or absence of the common and individual response signals from the mobile station by the response detection unit 10, and the processing device 20 detects the response. Whether there is an incoming call within the time frame (a) of the common response at the beginning of the signal
By "1" / "0", it is judged whether there is a response vehicle in the area. Therefore, at the base station, the time t at the end of the time frame (a) of the common response at the beginning of the response signal from the mobile station to the base station in FIG.
_{At 0} , the presence or absence of a response vehicle in the area is known. If there is a response vehicle in that area, the first common response frame (a)
By waiting for the end of the individual response signal for a certain time t after "1" from the beginning t _{1 of the first} time frame ₁ to the end t _N of the last time frame N as usual. However, if there is no response vehicle, the common response time frame at the beginning of the response signal (a)
The "0" of immediately indicates its absence, and at the time point t ₀ at the end of the time frame (a), the vehicle end processing is performed, and a message to that effect is displayed on the display device.
Displayed on 40, the operator can be prompted to perform an operation for vehicle search by another method.

[0007] Since a mobile station mounted on a vehicle generally moves fluidly within its business (activity) area, it is not possible to specify the number of vehicles of the mobile station existing in a certain area where a response is requested from the base station. Therefore, the total number N of the response signal time frames and the mobile stations are assigned to the individual response frames by the following method. That is, the number of response frames (10/20/3
(0 units, etc.) are installed, and time zone, designated area, designated range,
The number N of response frames is selected by the operator's judgment or automatically selected by the information processing device 20 in consideration of the vehicle classification and the like. When responding to the base station, the mobile station extracts an arbitrary value from its own random number table and randomly sets its own response frame within a range not exceeding the specified number of response frames. In the above case, the response frames of each mobile station are randomly assigned, so multiple mobile stations may select the same response time frame. In this case, information on mobile stations with strong transmission output waves may be selected. Only the base station receives the response signal as a response signal, or the individual response signals cannot be received at all due to a collision. However, even in this case, since the incoming call can be detected in the common response time frame (a) at the beginning of the response signal, even if the incoming call is detected in the common response frame (a), the If the information of one mobile station cannot be obtained in response frames 1 to N, the base station determines that it could not be received due to a collision, etc., and performs processing such as increasing the number of response frames and automatically By transmitting the re-search vehicle, the reliability of the search vehicle can be improved. In addition, after starting the vehicle search, response transmissions other than the simultaneous response within the common response time frame (a) of each mobile station are prohibited, or the base station sends the vehicle search signal, and then the response detection unit
Improve the detection accuracy of the response by the common response time frame (a) of the corresponding mobile station by taking measures such as initializing 10 in a timely manner and preventing erroneous detection of signals other than the common response time frame (a). It can be done.

[0008]

As described above, according to the present invention, it is possible to know the presence or absence of a response target mobile station within a certain area without a large waiting time, so that tasks such as taxi radio dispatch can be performed quickly. The effect that can be obtained is obtained.

[Brief description of drawings]

FIG. 1 is a principle diagram showing a configuration of a principle time frame of a probe signal from a base station to a mobile station and a response signal from the mobile station to the base station, which defines a basic configuration of a mobile station information collecting method of the present invention.

FIG. 2 is a configuration diagram of a base station / command room and a mobile station according to an embodiment of the present invention.

FIG. 3 is a configuration diagram of a probe signal transmitted by a base station according to an embodiment of the present invention.

FIG. 4 is a block diagram of a time frame of each signal in the conventional method.

[Explanation of symbols]

S is the probe signal transmitted from the base station to the mobile station, 1 to N is the time frame for the corresponding mobile station to respond individually, and (a) is the common response for the relevant mobile station at the beginning of the response signal. , And 10 is a response detector for detecting a response signal from the mobile station in the base station.

Claims (2)

[Claims] 1. A base station transmits a probe signal (S) for searching for a specific mobile station to a plurality of mobile stations, and then a response signal is transmitted from the corresponding mobile station to the base station. In the method of collecting mobile station information to the base station, the time frame (a) for the mobile station to respond in common at the beginning of the response signal from the mobile station to the base station and the mobile station to the base station The time frame of
When the means (10) for detecting the presence or absence ("1" / "0") of the response signal in (a) is provided, and there is no mobile station to respond to ("0"), the base station is A method of collecting mobile station information, characterized in that the transmission of the probe signal (S) is immediately stopped. 2. The base station received an incoming call within the time frame (a) of the common response at the beginning of the response signal from the mobile station ("1").
Despite the fact that the individual response window (1
If you can't get the information of one mobile station in (~ N),
A method for collecting mobile station information, characterized in that the base station automatically retransmits the probe signal (S) to the target mobile station.