JPH09294287A - Position measurement method and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the method and device by which a position measurement is conducted in a radio zone of a mobile radio terminal equipment with high accuracy independently of a network. SOLUTION: A distance versus reception electric field strength characteristic from each of base stations 7, 10a, 10b is obtained in advance, a mobile radio terminal equipment 6 measures base station identification information (CS-ID) as an identifier based on the reception electric field strength from a plurality of the base stations and collates the measured reception detection section with the distance versus reception electric field strength characteristic from each of the base stations 7, 10a, 10b to obtain an estimate distance from each base station and obtains the resident position or resident area of the mobile radio terminal equipment 6 based on a plurality of the estimate distance sets and the position of each base station.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a position positioning method and device for PHS.

[0002]

2. Description of the Related Art The PHS has the essential feature that the radio zone formed by one base station (CS) is extremely narrow as compared with a mobile phone. The personal handyphone (PS) monitors the electric field strength of CS in the vicinity,
When the current location registration CS moves to a certain level or less and the field strength becomes lower than a certain level, the location registration is performed to another CS having a stronger field strength. The position of the PS is specified using the information registered in the CS.

[0003]

The position information registered in the CS can be naturally known in the network. However, since it is information that can be known on the network side, it is impossible to pass the information to a third party other than the network operator because it exposes the extremely personal privacy of the whereabouts. There is a problem.

Further, even if we can know, this position information is
There is a second problem that it only shows the location of the CS that has performed the location registration, and does not show the information on where in the wireless zone the CS forms.

It is an object of the present invention to provide a highly accurate position locating device that does not involve a network and is located in a wireless zone formed by a base station CS.

[0006]

The electric field strength of a CS-ID signal which is periodically transmitted by the CS is not the CS-I
An apparatus equipped with the function of the present invention measures a plurality of CSs capable of receiving D signals, and measures in advance for each CS, or in consideration of the terrain around the base station, buildings, and seasonal trees. It is characterized in that it is calculated and collated with a database of electric field intensity distribution for each CS to identify the position from the combination of the closest electric field intensity.

[0007] Compared with the conventional method that can only approximate the position within the wireless zone formed by the CS, it is possible to perform highly accurate positioning without involving the network.

The following is assumed as an example of the system to which the present invention is applied.

[Example 1] By having a child who visits a facility such as an amusement park or a department store carry the device according to the present invention, it becomes easy to directly grasp the absolute position of the whereabouts when the child gets lost. It will be possible. Conventionally, when a child gets lost, he / she protects the information by informing other visitors of the request for discovery by broadcasting in the hall and contacting the staff of the facility.

In the method according to the present invention, the electric field strength distribution due to the CS installed in the facility is measured in advance, or is calculated in consideration of the influence of trees depending on the building and the season. The electric field strength data of the CS at the point is transmitted to the center for verification and the position is specified. Contact the parent / guardian with the location to protect the child.

[Example 2] For visitors visiting a tourist spot, local information within the tourist spot (for example, if it is a historic building, guidance such as ruins and murals is considered, and if it is a botanical garden, animals and plants) It is possible to provide) via a communication line.

For example, when standing in front of a certain relic in a historic building, it becomes possible for the center to provide only information regarding the relic.

Conventionally, a method of announcing a guide from a speaker installed in the vicinity of a local area, a weak radio wave transmitter is installed in the vicinity of the local area, and a visitor carries a receiver and approaches the vicinity. , The method of receiving the electric wave of the transmitter or the method of performing the guidance by the coin-insertion type guiding device. In such a system, since the devices are arranged in a distributed manner, a lot of maintenance and maintenance operations such as checking whether the devices are normal and collecting charges are required.

In the method according to the present invention, the electric field strength distribution due to the CS installed in the tourist area is measured in advance or is calculated in consideration of the influence of trees according to the building and the season. The electric field strength data of the CS at the point is transmitted to the center for verification and the position is specified. Using that position as a key, local information is searched, and only information on that local area is provided to visitors.

[0015]

FIG. 1 shows an embodiment of the present invention. In FIG. 1, 1 is a CS1 wireless zone, 2
Is a wireless zone of CS2, 3 is a wireless zone of CS3, 4 is a point X for which positioning is to be performed, and 5 is a point Y for which positioning is to be performed. Although FIG. 1 schematically shows the formation of wireless zones on concentric circles, in practice, PHS is 1.9G.
Since the frequency in the Hz band is used, the contribution of direct waves and reflected waves is large, and the wireless zone has a complicated shape.

FIG. 2 shows the electric field intensity distribution stored in the database at point X in FIG.

FIG. 3 shows the electric field intensity distribution stored in the database at point Y in FIG.

In FIG. 4, 6 is an electric field strength measuring function 6a.
And a terminal equipped with a communication function 6b with the center, 7 is a CS for communication, 8 is a public network, 9 is a communication function 9a with the terminal 6, a database collation function 9b and a database 9
A center 10 having c indicates a CS for measuring the electric field strength.

FIG. 5 shows another embodiment of the present invention, in which 11 is a terminal equipped with an electric field strength measuring function 6a, a database collating function 9b and a database 9c, and 10 is a CS for measuring electric field strength.

FIG. 6 shows a flow chart of the system operation of FIG.

Next, the operation of the above embodiment will be described.

The operation of the system shown in FIG. 4 will be described. It is assumed that the terminal 6 is placed at the point X in FIG. FIG.
As shown in the flowchart of FIG. 3, the terminal 6 measures the electric field strengths of CS7 and CS10 at the point X (22, 2).
4, 26), and the data is transmitted by connecting to the center 9 through the communication function 6b (28). The center database collation function 9b collates with the database 9c,
The closest combination of electric field intensity distributions, that is, the electric field intensity distribution shown in FIG. 2 is selected, the position X is specified (30), and returned to the terminal 6 (34).

Similarly, when the terminal 6 is placed at the point Y in FIG. 1, after measuring the electric field strengths of CS7 and CS10,
The data is transmitted by connecting to the center 9 through the communication function 6b. As a result of collating with the database 9c, the center database collating function 9b identifies the position from the combination of the closest electric field intensity distributions.

The system operation of FIG. 5 will be described. The device 11 is assumed to be placed at the point X in FIG. After measuring the electric field strength of CS10 at the point X, the device 11 specifies the position from the combination of the closest electric field strength distributions as a result of the database matching function 9b matching the database 9c.

[0025]

As is apparent from the above-described embodiment, the present invention measures the electric field strength of a plurality of CSs without using the position information by the position registration function on the network side, and measures the plurality of CSs measured in advance. Positioning is performed by collating with the electric field strength distribution, so that it is possible to perform highly accurate position determination without being known to the network side. Further, as shown in FIG. 5, by mounting a center function, that is, a database collation function and a database on the terminal, it is possible to perform position positioning by the terminal alone.

[Brief description of drawings]

FIG. 1 is an example of a CS wireless zone.

FIG. 2 is an electric field strength distribution at point X.

FIG. 3 is an electric field strength distribution at point Y.

FIG. 4 is a system configuration example of the present invention.

FIG. 5 is another system configuration example of the present invention.

6 is a flowchart of the system operation of FIG.

[Explanation of symbols]

1 CS1 wireless zone 2 CS2 wireless zone 3 CS3 wireless zone 4 Positioning point X 5 Positioning point Y 6 Terminal 7 equipped with electric field strength measurement function and communication function 7 For measuring electric field strength and for communicating with the center CS 8 Public network 9 Center 10 CS 11 for measuring electric field strength Device for equipping with electric field strength measurement function, database collation function and database

Claims (4)

[Claims] 1. A wireless zone is configured by a plurality of base stations (7, 10a, 10b), and each base station transmits a radio wave including unique base station identification information, and a plurality of mobile stations that can move within the wireless zone. In the mobile communication system, each mobile radio terminal (6) is connected to each base station having a continuously connectable electric field strength via radio communication means, from each base station (7, 10a, 10b). The distance-to-received field strength characteristic of is measured or calculated in advance, and the mobile radio terminal (6) measures received field strengths from a plurality of base stations using the base station identification information as an identifier, and a measured value of the received field strength. The estimated distance from each base station is obtained by collating with the distance-to-reception electric field strength characteristics of each base station, and the estimated distance from each base station and the position of each base station are used to determine the mobile radio terminal (6). Existence position or existence And obtaining the range, position measurement method. 2. A wireless zone is constituted by a plurality of base stations (7, 10a, 10b) capable of transmitting radio waves including unique base station identification information, and the wireless zone is movable and continuously connectable. In a position measuring device for measuring the position of a mobile wireless terminal (6) connected to each base station having various electric field strengths via a wireless communication means, a mobile wireless terminal (6) or a mobile wireless terminal (6) and a wireless Each base station (7,
10a, 10b) has a database (9c) for accumulating characteristics of distance-to-received electric field strength from the base station, and the mobile radio terminal (6) receives received electric field strengths from a plurality of base stations as the base station identification information. The center (9) or the mobile radio terminal (6) compares the measured value of the received electric field strength with the distance-to-received electric field strength characteristic of each base station. A database collating function (9b) for obtaining an estimated distance from the base station is provided, and an existing position or an existing range of the mobile radio terminal (6) is obtained from the obtained plural estimated distances and the position of each base station. Characteristic position measurement device. 3. The base station at least partially has a communication function for communication of a mobile radio terminal and the database, and another base station does not have the communication function and includes the database. The position measuring method described in 1. 4. The position measuring method according to claim 1, wherein the distance-to-received electric field strength characteristic includes at least one influence of topography, buildings, trees, and weather around the base station.