JPH10224852A - Position retrieving system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the precision of positional retrieval with respect to a mobile communication terminal and to improve the convenience of positional retrieval by allowing a mobile communication terminal to detect the residual capacity of its own battery and informing a position managing station of positional information when the residual capacity of the battery becomes lower than a prescribed value. SOLUTION: The mobile communication terminal detects the residual capacity of its own battery incorporated in itself and compares the battery residual capacity with a prescribed threshold value fixed in advance. When the battery residual capacity is lower than the prescribed threshold value, the terminal calls to the position managing station to transmits its own positional information and battery residual capacity information. Then, the detection of the battery residual capacity and the comparison of the battery residual capacity with the threshold value can be realized by the method of comparing the detected battery voltage with a prescribed constant voltage by a comparator circuit and making interruption on a processor and the method of reading a battery voltage and comparing the value with a prescribed threshold value by the processor based on a program.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a location search method for a mobile communication terminal in a mobile communication system.

[0002]

2. Description of the Related Art In recent years, in a mobile communication system such as a portable telephone or a personal handyphone system (PHS), a position for detecting the position of a mobile communication terminal in the system using each of these mobile communication systems. Search methods have been proposed.

[0003] An example of a conventional location search method for a mobile communication terminal performed using the above-described mobile communication system will be described below. FIG. 3 shows an example of a configuration of a mobile communication system using a conventional location search method. In FIG. 3, reference numeral 31 denotes a mobile communication terminal;
a, 32b, 32c, ... are base stations, 33 is a location management station,
Reference numeral 34 denotes a communication network connecting the mobile communication terminal 31 and the location management station 33 through the base stations 32a, 32b, 32c,.

An outline of a position search method in a mobile communication system including the above components will be described below. First, the mobile communication terminal 31 is connected to the base station 32a, 3
2b, 32c,..., And records the base station identification code and the reception electric field level of the radio signal included in the radio signal as position information. This location information
Whether the location management station 33 calls the mobile communication terminal 31 or the mobile communication terminal 31 calls the location management station 33, the mobile station moves through the communication network 34 set between the location management station 33 and the mobile communication terminal 31. From the communication terminal 31 to the location management station 3
3 is sent.

[0005] Next, the location management station 33 includes a communication line network 34.
The position of the mobile communication terminal 31 is detected based on the position information received from the mobile communication terminal 31 through.

[0006]

However, in the above-described conventional position search method, the battery built in the mobile communication terminal 31 is depleted and communication becomes impossible.
There has been a problem that the accuracy and convenience of the location search for the mobile communication terminal 31 by the location management station 33 are reduced.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems. It is possible to improve the accuracy of position search for a mobile communication terminal, and to improve the convenience of position search such as centralized management of remaining battery capacity in a mobile communication terminal. And a position search method capable of improving the position search method.

[0008]

In order to solve the above-mentioned problems, a position search method according to the present invention uses a position management station to detect the remaining battery capacity of a mobile communication terminal and the position of the mobile communication terminal in advance, and to determine the remaining position. On the basis of this information, the position immediately before the mobile communication terminal becomes unable to communicate is grasped.

As described above, it is possible to improve the accuracy of the position search for the mobile communication terminal and to improve the convenience of the position search such as centralized management of the remaining battery capacity in the mobile communication terminal.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In a position search system according to a first aspect of the present invention, when a mobile communication terminal notifies a position management station of its position information via a communication network, the position management station transmits the position information to the mobile communication terminal. The mobile communication terminal detects the remaining capacity of its own battery and notifies the location information to the location management station when the remaining battery capacity falls below a predetermined value. System.

According to a second aspect of the present invention, in the position search method, the mobile communication terminal notifies the position management station of the position information via a communication network, so that the position management station detects the position of the mobile communication terminal. The mobile communication terminal detects the remaining capacity of its own battery, and notifies the location management station of the remaining battery capacity information together with the location information.

According to these methods, the position management station detects the remaining battery capacity of the mobile communication terminal and the position of the mobile communication terminal in advance and, based on the information, determines the position immediately before the mobile communication terminal cannot communicate. Figure out.

Hereinafter, a position search method according to an embodiment of the present invention will be specifically described with reference to the drawings.
FIG. 1 is a flowchart showing the operation of the mobile communication terminal in the position search method according to the present embodiment. As shown in FIG. 1, the mobile communication terminal first detects the remaining battery capacity of a battery built in itself in step # 11, and proceeds to step # 1.
In step # 2, the remaining battery capacity is compared with a predetermined threshold value. If the remaining battery capacity is equal to or less than the predetermined threshold value, a call is made to the location management station in step # 13, and the position information and the remaining battery capacity information of the self station are read. Send

Here, the detection of the remaining battery capacity in step # 11 and the comparison of the remaining battery capacity with a predetermined threshold value in step # 12 are performed, for example, by comparing the detected battery voltage with a predetermined constant voltage by a comparator circuit, and instructing the processor. It can be realized by a method of applying an interrupt, a method of inputting a battery voltage to an A / D converter, reading an output from the input port of the processor, and comparing the value with a predetermined threshold by a processor based on a program.

FIG. 2 shows an example of a format of transmission data of the mobile communication terminal in the position search method according to the present embodiment. In FIG. 2, for example, 21 is a header, 22 is its own position information, 23 is remaining battery capacity information of a battery built therein, and 24 is a trailer.

[0016] In the above manner, the location management station detects the remaining battery capacity of the mobile communication terminal and the position of the mobile communication terminal in advance and, based on the information, immediately before the mobile communication terminal becomes unable to communicate. Position can be grasped.

As a result, the accuracy of the position search for the mobile communication terminal can be improved, and the convenience of the position search such as centralized management of the remaining battery capacity in the mobile communication terminal can be improved.

In the position search method according to the above-described embodiment, a case has been described in which both the contents described in claim 1 and the contents described in claim 2 are carried out. It is.

In the position search method according to the above-described embodiment, the case where only the position information and the remaining battery capacity information are transmitted has been described. However, other information can be transmitted at the same time. be able to.

[0020]

As described above, according to the present invention, the location management station detects in advance the remaining battery capacity of the mobile communication terminal and the position of the mobile communication terminal while the mobile communication terminal is moving, and based on the information, detects the remaining capacity of the mobile communication terminal. It is possible to grasp the position immediately before communication becomes impossible.

Therefore, the accuracy of the position search for the mobile communication terminal can be improved, and the convenience of the position search such as centralized management of the remaining battery capacity in the mobile communication terminal can be improved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an operation of a mobile communication terminal using a position search method according to an embodiment of the present invention.

FIG. 2 is a format of transmission data of the mobile communication terminal according to the embodiment.

FIG. 3 is a configuration example of a mobile communication system between a location management station and a mobile communication terminal.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Header 22 Position information 23 Battery remaining capacity information 24 Trailer 31 Mobile communication terminal 32a, 32b, 32c Base station 33 Location management station 34 Communication network

Claims (2)

[Claims] 1. A location search method in which a mobile communication terminal notifies a location management station of the location information via a communication network so that the location management station detects the location of the mobile communication terminal. Detecting the remaining capacity of its own battery and notifying the location information to the location management station when the remaining battery capacity falls below a predetermined value. 2. A location search system in which a mobile communication terminal notifies a location management station of its location information via a communication network so that the location management station detects the location of the mobile communication terminal. Detects the remaining capacity of its own battery and notifies the location management station of the remaining battery capacity information together with the location information.