JP2001128222A - Position detection method and device for radio mobile station - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a radio mobile station to detect a position highly precisely on the basis of a reception electric field strength from base stations. SOLUTION: In the system where a position is detected on the basis of a radio wave strength from base stations at a measurement point of a service area, in the case that the electric field strength cannot be detected at the same point on the basis of the basic data in an electric field strength data storage section, the position detection precision can be improved by supplementing the data. Furthermore, a position detector or a terminal has a characteristic of a terminal whose electric field strength is measured so as to eliminate the terminal characteristic from the result of measurement so as to enhance the position detection accuracy. The basic data are provided for each state in an environment with many changes in a radio wave environment such as the effect of a train of a station and the basic data are calculated by each state by utilizing geographic information so as to suppress the effect of the state and deterioration in the position detection accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for detecting the position of a moving object in the field of mobile radio communication. In particular, the present invention relates to a method and an apparatus for detecting a position of a mobile station based on received electric field strengths from a plurality of base stations measured by the mobile station.

[0002]

2. Description of the Related Art In a conventional radio communication method in which a service area is constituted by a plurality of radio zones such as a portable telephone and a PHS, the current position of a mobile station is determined by the radio zone of the base station with which the mobile station has registered the location. A method of detecting a relatively wide area (or a range of a paging area composed of a plurality of radio zones including a radio zone of a base station whose location is registered), and "A study on the position detection of a moving object based on reception level information""IEICE Autumn Conference, B-
269 (1993), by utilizing the fact that the wireless zones of a plurality of base stations overlap each other, the strength of the received radio waves from the plurality of base stations received by the mobile station and the position (X, Y) of that position are determined. From the mapping table, a method of specifying the current position of the mobile station in a range narrower than the wireless zone of one base station, and a method of detecting the position of the mobile station (application number PA08-198703). At the measurement point in the service area, the received field strengths from a plurality of base stations are measured a plurality of times in advance, and the relationship between the received field strength and the position is stored in a database in association with the field strength. Statistical methods such as performing a weighted average based on multiple field strength data with small errors based on the comparison of received field strength at the point to be detected By estimating the position using, a method of estimating the position of a mobile station in a narrower range than the distance between the measuring points is not limited to the actual measured point.

[0003] "Radio mobile station position detection method" (Application No.
PA08-198703) will be described with reference to FIG. As basic data for position detection, the electric field intensity received from a plurality of base stations at each point in the service area was measured a plurality of times (for example, j times), and the position (X, Y) of the measurement point and reception were possible there. M sets of electric field strengths from neighboring base stations ((BS11, E11), (BS12, E12),…, (BS1m, E
1m)),… ((BSj1, Ej1), (BSj2, Ej2),…,
(BSjm, Ejm)) is stored in advance in the electric field intensity data storage unit of the center. To detect the position of a mobile station, the electric field strengths received from a plurality of base stations ((BS1 ', E1'),
(BS2 ', E2') ... (BSm ', Em')) to the center, and compares the radio field intensity data in the radio field intensity data storage section with the received field intensity at the point where the position is to be detected. Based on a plurality of radio wave intensity data having a small error as a result of the comparison of the radio wave intensity, the position is estimated using a statistical method such as a weighted average. Thus, the position of the mobile station can be estimated in a range narrower than the distance between the measurement points without being limited to the actually measured points.

[0004]

However, in the above-described position detection method, when the number of electric field strengths that can be received and reported by the mobile station is limited, for example, up to m base stations from the mobile station can be used. When the field strength can be received, if the field strength of m or more base stations can be actually observed, the base stations that can be captured are switched at the measurement timing due to the influence of multipath, and as a result, the position detection accuracy Had the problem that it became worse.

[0005] Also, due to differences in the characteristics of each terminal generated during the manufacturing process of a terminal for measuring the electric field strength, if the terminal for which the electric field strength is held in the database is different from the terminal of the mobile station whose position is to be detected, the terminal There is also a problem that the characteristic difference affects accuracy. Furthermore, depending on the location, there is also a problem that the location electric field strength from the base station greatly varies depending on the location of a train, such as a station platform, where the surrounding radio wave environment changes drastically, which greatly affects location accuracy. Was. Furthermore, there is a problem that even if the location of the mobile station is known, it is not known whether the mobile station is stopped or walking.

The present invention has been made in view of the above-mentioned conventional problems, and has as its object to detect a position with high accuracy based on the intensity of radio waves received from a plurality of base stations.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a position detecting device in which, when the number of electric field strengths that can be received and reported by a mobile station is limited, the electric field strength within the position detecting device is limited. The electric field intensity measurement value held in the data storage unit can be detected at each position by detecting the base station that can or may not be acquired. The accuracy of the position detection can be improved by suppressing the variation of the received electric field intensity when the error is determined by using the received electric field intensity data at the time and the electric field intensity data stored in the electric field intensity data storage unit as a position determination criterion.

Further, a terminal characteristic storage unit is provided in the position detecting device, and the characteristic value of the mobile station serving as a reference and the characteristic value of the terminal whose position is to be detected are held, whereby each electric field intensity data reported from the mobile station at the time of position detection is obtained. By subtracting the characteristic value unique to the terminal from the electric field intensity value of the above, the detection position accuracy can be improved.

Similarly, if the terminal of the mobile station is provided with a terminal characteristic storage unit so that the terminal characteristics are transmitted at the same time as the position is detected, the terminal characteristics are not known in advance in the position detecting device, and the time elapses. In addition, even if the terminal characteristics change, it is possible to easily reduce a decrease in the position accuracy due to the terminal characteristics without changing the position detection device.

Further, in the case where the radio wave environment is greatly affected, for example, when a train enters, the state is controlled in cooperation with a state management unit for managing the state. By selecting the electric field intensity data according to the state, the influence of the state change on the position detection accuracy can be reduced, and the position detection accuracy can be improved. By storing basic data that does not block radio waves from the base station in the electric field strength data storage unit for each state, and having the location information of the base station and measurement points and the position information of obstacles that block the radio waves for each state in the map data storage unit From these, it is possible to automatically calculate and generate the electric field intensity data in each state, and to measure the electric field intensity data according to the state without measuring the electric field intensity at all measurement points in the area for every state pattern. This makes it possible to perform highly accurate position detection even when an obstacle is present.

[0011] A terminal speed history storage unit is provided in the position detection device, and the position information of the mobile station estimated by the position detection unit, the time stamp at that time, and the movement speed are stored in the terminal speed history storage unit, so that a network or the like can be used. By providing the speed information of the mobile station in addition to the location information of the mobile station when the terminal location is inquired from another company through the Internet, the receiver can easily predict the current state of the mobile station and the next action.

Further, it is possible to correct the detected position based on the moving distance of the mobile station from the speed information of the terminal using the speed history information stored in the terminal speed storage unit, so that the position can be detected with higher accuracy. It becomes possible.

As an invention having such various aspects,
The invention according to claim 1 of the present invention is used in a mobile radio communication system for performing radio communication between a mobile station and a base station, and is used to receive and acquire signals from peripheral base stations at a plurality of measurement points in an area. In the position detection method of holding the electric field intensity data and comparing the held electric field intensity data with the electric field intensity at the point where the position is to be detected and estimating the position, the position of the held electric field intensity data to be compared at the time of position detection Among them, the position detection is performed by complementing the electric field intensity of the base station that cannot capture the electric field intensity data for each same measurement point, and at the time of position detection, the received electric field intensity data at the time of detection and the held Variations in the received electric field strength can be suppressed when the electric field strength data is used as a position determination criterion to determine an error, thereby improving the position detection accuracy. It has the effect of that.

[0014] The invention according to claim 2 of the present invention is used in a mobile radio communication system for performing radio communication between a mobile station and a base station. In a position detection method for holding captured reception field strength data and comparing the stored field strength data with the field strength at a position to be detected, and estimating a position, a reference terminal that measures the reception field strength data And its terminal characteristics, and other characteristics of the mobile station terminal are stored, and when the electric field intensity is reported from the mobile station, the position is detected by removing the terminal characteristics from the reported electric field intensity data. By holding the characteristic value of the reference mobile station and the characteristic value of the terminal that detects the position,
By subtracting the terminal-specific characteristic value from the electric field intensity value of each electric field intensity data reported from the mobile station at the time of position detection, the detected position accuracy can be improved using the standardized mobile station electric field intensity data excluding the terminal characteristics. It has the effect of improving.

The invention according to claim 3 of the present invention is used in a mobile radio communication system for performing radio communication between a mobile station and a base station, and is used at a plurality of measurement points in an area from a peripheral base station. In a position detection method that holds captured received electric field intensity data and compares the stored electric field intensity data with the electric field intensity at the point where the position is to be detected, and estimates the position, a failure is detected at a plurality of measurement points in the area. When the radio wave condition changes depending on the presence or absence of an object, the received electric field intensity data captured from the surrounding base station is retained for each state, and the electric field intensity data according to the state is compared with the electric field intensity data at the point to be detected. It is designed to perform position detection by estimating the position to be performed, and
When the radio wave environment is greatly affected, cooperate with the state management unit that manages the state, and select the electric field intensity data according to the state from the electric field intensity data storage unit for each state that holds the electric field intensity data for each state. Accordingly, it is possible to reduce the influence of the state change on the position detection accuracy, and to improve the position detection accuracy.

According to a fourth aspect of the present invention, there is further provided an error electric field intensity data for storing a plurality of electric field intensity data having a small error, and a state which changes with time is managed. The position detection is performed by coordinating with the comparison operation between the corresponding electric field intensity data and the electric field intensity data at the point where the position is desired to be detected, so that the radio wave environment such as the train entry state is greatly affected. In this case, the position detection accuracy of the state change is selected by cooperating with the state management unit that manages the state and selecting the electric field intensity data according to the state from the state-specific electric field intensity data storage unit that holds the electric field intensity data for each state. And the effect of improving the position detection accuracy.

According to a fifth aspect of the present invention, there is provided a position detecting apparatus for a mobile radio communication system for performing wireless communication between a mobile station and a base station, wherein the peripheral base station is located at a plurality of measurement points in the area. An electric field intensity data storage unit for holding received electric field intensity data captured from a station; a position detection unit for estimating a position by comparing electric field intensity data in the electric field intensity data storage unit with an electric field intensity at a position to be detected; An error electric field intensity data storage unit that holds electric field intensity data with a small error of the position detection unit, at the time of position detection,
Position detection processing by complementing the base station field strength that cannot capture the field at the same measurement point in the field strength data in the field strength data storage that holds the field strength data to be compared with the captured field strength data Is performed. In this way, when the number of electric field strengths that can be received and reported by the mobile station is limited, the electric field strength measurement value stored in the electric field strength data storage unit in the position detection device, which is measured in the same manner, is stored for each point. For a base station that may or may not be able to be acquired, by supplementing the acquired electric field strength at that point when it cannot be acquired, the received electric field intensity data at the time of position detection and the electric field stored in the electric field intensity data storage unit are detected. Variations in the received electric field strength when the strength data is used as a position determination criterion for error determination can be suppressed, and this has the effect of improving the position detection accuracy.

According to a sixth aspect of the present invention, in the position detecting apparatus for a wireless mobile station according to the fifth aspect, the supplementary electric field intensity data is obtained by calculating an average value of the electric field intensity of a base station that cannot capture an electric field. For a base station where an electric field can be captured or cannot be captured by taking the average value, by supplementing the captured electric field strength based on the electric field value when captured, This has the effect of improving the position detection accuracy.

According to a seventh aspect of the present invention, there is provided a position detecting apparatus for a mobile radio communication system for performing radio communication between a mobile station and a base station, wherein the plurality of measurement points in the area are used for a peripheral base station. An electric field intensity data storage unit for holding received electric field intensity data captured from a station, and a position detection unit having means for estimating a position by comparing the electric field intensity data in the electric field intensity data storage unit with the electric field intensity at a point to be detected. And an error electric field intensity data storage unit for storing a plurality of electric field intensity data having small errors, and a terminal characteristic for storing the characteristics of the reference terminal, its terminal characteristics, and other characteristics of the mobile station terminal which measured the data retained in the electric field intensity storage unit And a storage unit, when performing the electric field strength report from the mobile station, to perform the position detection by removing the terminal characteristics from the reported electric field strength data, By holding the characteristic value of the mobile station and the characteristic value of the terminal that detects the position, by subtracting the terminal-specific characteristic value from the electric field intensity value of each electric field intensity data reported from the mobile station at the time of position detection, Using the standardized electric field strength data of the mobile station excluding the terminal characteristics, it has the effect of improving the detection position accuracy.

According to an eighth aspect of the present invention, in the position detecting apparatus for a wireless mobile station according to the seventh aspect, instead of providing the terminal detecting section in the position detecting apparatus, the characteristic of the mobile station terminal is provided in the mobile station. The position detection device is configured to detect the position by receiving the terminal characteristics together with the electric field strength data at the time of position detection from the mobile station. If a characteristic storage unit is provided and terminal characteristics are transmitted at the same time as position detection, even if the terminal characteristics are not known in advance in the position detection device, and even if the terminal characteristics change over time, the position detection device Has the effect of easily reducing the deterioration of the position accuracy due to the terminal characteristics without changing the terminal characteristics.

According to a ninth aspect of the present invention, there is provided a position detecting apparatus of a mobile radio communication system for performing radio communication between a mobile station and a base station, wherein a fault is detected at a plurality of measurement points in an area. When the radio wave condition changes depending on the presence or absence of an object, the state-specific electric field strength data storage unit that holds the received electric field intensity data captured from the surrounding base station for each state, and the state that is stored in the state-specific electric field strength data storage unit A position detection unit that estimates the position by comparing the electric field intensity data and the electric field intensity at the point to be detected, and an error electric field intensity data storage unit that holds a plurality of electric field intensity data with small errors,
It has a state management unit that manages the state that changes with time, and performs position detection according to the changing state.If the radio wave environment is greatly affected, such as the train entry state, In cooperation with the state management unit that manages the state, the electric field intensity data according to the state is selected from the state-specific electric field intensity data storage unit that holds the electric field intensity data for each state, thereby reducing the influence of the state change on the position detection accuracy. This has the effect of improving the position detection accuracy.

According to a tenth aspect of the present invention, there is provided a map data storage unit for holding a position of a base station, a measurement point of electric field intensity data or a position of an obstacle such as a train, and a state-specific electric field intensity data storage unit. It has reference electric field intensity data such that there is no obstacle, and includes a state-specific electric field intensity data generation unit having means for generating state-specific electric field intensity data according to the state from the electric field intensity data, and data according to the state. The position detecting device is provided with a state-based electric field strength data storage section for holding electric field strength data for each state such as a radio wave environment, and the base station is provided for the state electric field strength data storage section. By holding the basic data that does not block the radio waves from, the map data storage unit has the position information of base stations and measurement points, and the position information of obstacles that block the radio waves for each state,
From these, it is possible to automatically calculate and generate the electric field intensity data in each state, without measuring the electric field intensity at all measurement points in the area for each state pattern,
Using the electric field intensity data corresponding to the state, there is an effect that highly accurate position detection is performed even if an obstacle exists.

[0023] According to an eleventh aspect of the present invention, in a mobile radio communication system for performing radio communication between a mobile station and a base station, a mobile station detects a moving speed of the mobile station. A field detection data storage unit for storing received field strength data from peripheral base stations measured at a plurality of measurement points in the area, and an electric field stored in the field strength data storage unit. A position detector having means for comparing the electric field intensity reported from the mobile station at the point where the position data is to be detected and estimating a position; and a moving speed of the mobile station and position information of the mobile station reported from the mobile station. And a terminal speed history storage unit for storing a plurality of electric field intensity data with a small error, and a moving speed at the time of position detection in response to an inquiry from another person. It is those you to provide,
Providing mobile station speed information in addition to the mobile station location information when the terminal location is inquired from others through a network, etc., makes it easier for the recipient to predict the current state of the mobile station and the next action. Has an action.

According to a twelfth aspect of the present invention, in the position detecting device for a wireless mobile station according to the eleventh aspect, at the time of position detection, the electric field intensity reported from the mobile station by the position detecting unit of the position detecting device is used. The position to be detected and the terminal speed history in the terminal speed history storage unit are used to perform position detection.Using the speed history information stored in the terminal speed storage unit, the terminal speed information is used. The detected position can be corrected using the moving distance of the mobile station as a guide, and the position is detected with higher accuracy.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (Embodiment 1) The operation of a wireless communication system according to Embodiment 1 to which a method for detecting a position of a wireless mobile station according to the present invention is applied will be described with reference to the drawings.
FIG. 1 is a system block diagram showing a system outline configuration in a first embodiment of a wireless communication system to which a position detection method of the present invention is applied, and FIG. 2 is a block diagram showing a configuration of the position detection device shown in FIG. .

In FIG. 1, reference numeral 101 denotes a mobile station;
, 126 are base stations, 131 is a communication control unit that controls communication with a plurality of base stations, 132 is a network, 133 is a location information center, 134 is a communication that performs transmission and reception with the network 132 and controls position detection processing. The control unit 135 is a position detection device that detects a position controlled by the communication control unit 133.

In FIG. 2, reference numeral 201 denotes the position detecting device 135 shown in FIG. 1, and reference numeral 202 denotes electric field strength data comprising position information and electric field strengths received from a plurality of base stations at a plurality of measurement points in a mobile station. The electric field intensity data storage unit 203 performs a comparison between the electric field intensity data of the electric field intensity data storage unit 202 and the electric field intensity at a point to be detected, and a position detection unit having means for estimating a position. This is an error electric field intensity data storage unit that holds electric field intensity data.

FIG. 1 shows a wireless communication system according to this embodiment.
As shown in the figure, the mobile station 101 has a plurality of base stations 111,
In the case where the mobile station 101 belongs to each of the wireless zones 112,..., 126 at the same time, based on the electric field intensity signal of the base station measured by the mobile station 101, the position detecting unit in the position detecting device 135 in the position information center 133. The position of the mobile station 101 is detected by the function of the signal strength data storage unit 203. In the operation of the wireless communication system according to the present embodiment, position information at a plurality of measurement points in a service area and field strength data including received field strengths from a plurality of base stations are input to the field strength data storage unit 202 in advance. The processing is divided into preprocessing and detection processing for estimating the position of the mobile station 101 based on the stored electric field strength data.

First, it is assumed that the radio field intensity data has already been input to the electric field intensity data storage unit 202, and the operation of the detection processing until the mobile station 101 issues a position detection request and the current position of the mobile station 101 is estimated. Will be described.
Here, a description will be given assuming that the number of wireless zones to which the mobile station 101 belongs simultaneously is 16, and the number of electric field strengths from the base station that can be reported by the mobile station 101 is "8 (for 8 mobile stations)".

The mobile station 101 simultaneously transmits to the base stations 111, 1
,..., 126 belong to the wireless zone. At the time of position detection, the mobile station 101 measures electric field strengths from a plurality of base stations. After acquiring the eight base station field strengths from the higher field strength, the mobile station 101 selects the received field strength data, for example, the base station 111 having the largest field strength, and transmits it. The base station 111 is a mobile station 1
When receiving the received electric field strength data from No. 01, it transmits this to the location information center 133 via the communication control unit 131 and the network 132. Upon receiving the received electric field strength data, the position information center 133 passes the received electric field strength data to the communication control unit 134, and the communication control unit 134 passes the data to the position detection device 135. The position detection device 135 estimates the position of the mobile station 101 based on the received electric field strength data passed from the communication control unit 134 and obtains an estimation result.

Here, a position detecting method in the position detecting device 135 will be described with reference to FIG. The electric field intensity data storage unit 202 of the position detecting device 201 measures j times at each of the measurement points Pi (Xi, Yi) in the area in the preprocessing, and saves the reported base station electric field intensity m as an initial value. It is. From the above assumption, m is “8” here. Position detecting section 203 of position detecting device 201
Compares the received electric field strength reported from the mobile station 101 with the electric field strength data measured j times at all points stored in the electric field strength storage unit 202. As a result of the comparison, the nearest k pieces are taken out and stored in the error electric field strength data storage unit 204. Here, the “error” is a mathematical distance between two electric field intensity data, and is described using a Euclidean distance for simplicity.
The position detection unit 203 estimates the position by performing statistical processing such as weighted averaging from the k points and the error information in the error electric field strength storage unit 204.

FIG. 3 shows an example of the measured electric field intensity at a certain measurement point A. Here, the number of measurements j is set to “10
(Times) ”and the number of base stations belonging to the wireless zone is“ 16 (points) ”. From FIG. 3, at point A, the base stations for which the received field strength is always reported are CS1, CS4,
CS9, CS10, CS14, and CS15. Also, due to the effect of fading, the received electric field strength changes depending on the measurement, and the electric field strength may or may not be reported. , CS12, CS
Thirteen.

FIG. 4 shows the obtained electric field strength value at a measurement point A at a certain time. Here, this is data measured at the timing of position detection. When the measured values are compared using the Euclidean distance as an error based on such values, the obtained electric field intensity at a certain point (at the time of position detection) at the same point A and the electric field intensity at the number of times of measurement shown in FIG. The data distance is represented by the following equation 1.

(Equation 1) ... (Equation 1)

Similarly, when the distance between the position detection and the number of times of measurement 5 is compared only for the base station captured at the time of position detection, the distance of the electric field strength data is expressed by the following equation (2).

(Equation 2) ... (Equation 2), and the error which is the criterion for the position becomes large due to the influence of the variation of the captured base station. In order to solve such a problem, a method of correcting the electric field intensity value at the point A will be described.

In the measured electric field strength at the measurement point A in FIG. 3, CS1 and CS of the six base stations in descending order of electric field strength are used.
4, the electric field strengths of CS9, CS10, CS14, and CS15 can be captured all 10 times, and the next highest four base stations,
It is considered that base stations that can be captured are replaced by CS3, CS8, CS12, and CS13 due to the effects of fading.
That is, in these four base stations, the reception electric field intensity changes depending on the measurement, and the electric field intensity may be reported or not. Therefore, an average value of the captured electric field strength is obtained for all the base stations including the above four base stations.
Here, for the above four base stations, an average value is obtained for the number of times the electric field strength is reported (a value of 0 is ignored).
For example, regarding the base station CS3, the electric field intensity was not reported from the first measurement to the fourth measurement, but the electric field intensity was reported from the fifth measurement to the tenth measurement, and the measured electric field intensity was as follows. It is. 5th 44 6th 44 7th 42 8th 40 9th 44 10th 40 Therefore, the average value of the captured electric field strength of the base station CS3 is (44 + 44 + 42 + 40 + 44 + 40) ÷ 6 = 42.
It becomes 3. FIG. 5 shows the measurement point A obtained as described above.
FIG. 4 is a diagram showing the average of the trapped electric field strength in FIG. The reason why the distance of the electric field strength data, which is the criterion for the position, changes despite the fact that measurements were taken at the same point, is largely due to the exchange of these four base stations. For this reason, FIG.
FIG. 6 shows an electric field intensity value that is complemented by filling in the average of the trapped electric field intensity shown in FIG.

Complementing the measured electric field strength in this way gives
The captured electric field intensity data at the time of position detection in FIG.
The distance of the captured electric field intensity data of the measurement number 5 in

(Equation 3) ... (Equation 3), and it is possible to reduce the variation of the error due to the variation of the received electric field strength at the same point.

As described above, the electric field intensity measurement value held in the electric field intensity data storage unit in the position detection device is acquired for each base station. Complement with the average of the trapped electric field strength of Thereby, at the time of position detection, when the received electric field intensity data at the time of detection and the electric field intensity data stored in the electric field intensity data storage unit are determined by an error as a position determination reference,
Variations in the received electric field strength due to fading can be suppressed, and as a result, the accuracy of position detection can be improved.

(Embodiment 2) The operation of the wireless communication system according to Embodiment 2 to which the method for detecting the position of a wireless mobile station of the present invention is applied will be described with reference to FIGS. FIG.
In the figure, reference numeral 701 denotes a position detection device 135 in FIG. 1 of the first embodiment, and 702 holds electric field intensity data including position information and electric field intensity received from a plurality of base stations at a plurality of measurement points in a mobile station. An electric field intensity data storage unit 703 is a position detecting unit having means for comparing the electric field intensity data of the electric field intensity data storage unit 702 with the electric field intensity at a point to be detected, and estimating a position. An error electric field intensity data storage unit 705 for storing electric field intensity data is a terminal characteristic storage unit 705 for storing characteristics of a reference terminal or a terminal for position detection which measures the electric field intensity held in the electric field intensity storage unit.

In FIG. 8, reference numeral 801 denotes a mobile station, and 802 denotes a base station. It is assumed that the mobile station 801 is at a reference position that is at a certain distance from any base station. First, it is assumed that the mobile station 801 is a reference terminal that has measured data held in the electric field strength data storage unit. At the reference position, the mobile station 801 measures the electric field strength from the base station 802 n times. n is at least 10, a value sufficient to stabilize the average of the received electric field strengths of n times. Here, the description will be made assuming that n is 100. The average of the electric field intensity of n times corrected by the mobile station 801 is taken, and the average is used as a reference value s, and the terminal characteristic storage unit 7
05. Similarly, for a terminal whose position is to be detected, measurement is performed n times at the same reference position, and the average is stored in the terminal characteristic storage unit 705 as a characteristic value for each terminal.

Next, a method for detecting the position of the mobile station using the terminal characteristics will be described. The flow of the operation of the detection processing from when the mobile station issues a position detection request to when the position detection device estimates the current position of the mobile station is the same as in the first embodiment.

FIG. 7 shows a configuration in which the position detecting device 135 of the first embodiment shown in FIG. 1 is applied to this embodiment. The difference between the first embodiment and FIG. 2 is that a terminal characteristic storage unit 705 is added to the position detection device 701. here,
The operation from when the position detection device 135 receives the electric field strength data from the mobile station 101 to when the position is detected will be described with reference to FIG. Position detector 7 of position detector 701
03 receives the received field strength data reported from the mobile station, and searches the terminal characteristic storage unit 705 for the terminal ID of the mobile station. Here, the characteristic of each terminal held in the terminal characteristic storage unit 705 is 1 at the same reference position measured by the reference terminal.
It is assumed that the measurement is performed 00 times, the average is obtained, and the difference between the average and the reference value s is held. Terminal characteristics storage unit 205
When the terminal ID of the mobile station is found from, the characteristic value corresponding to the terminal ID is extracted, and the characteristic value is subtracted from the electric field intensity value of each electric field intensity data reported from the mobile station. Using the standardized field strength data of the mobile station excluding the terminal characteristics, the data stored in the field strength data storage unit 702 and the distance between the data stored in the field strength data storage unit 702 are compared and stored in the k-field error field strength data storage unit 204. Then, the position is estimated from the information by using a statistical method.

Although the method of estimating a position using the k-nearest neighbor method has been described above, it is apparent that any method of detecting a position using an electric field strength from a base station can be applied. In addition, when the data of the electric field strength storage unit is measured using a plurality of terminals, it is clear that if the data other than the reference terminal is similarly corrected and stored, the reception electric field strength error due to the characteristics of the terminal is removed. is there.

By providing the terminal characteristic storage unit in the position detecting device and holding the characteristic value of the reference mobile station and the characteristic value of the terminal whose position is to be detected, each electric field reported from the mobile station at the time of position detection is obtained. By subtracting the terminal-specific characteristic value from the electric field intensity value of the intensity data, it is possible to improve the detection position accuracy using the standardized mobile station electric field intensity data excluding the terminal characteristics.

(Embodiment 3) The operation of the radio communication system according to Embodiment 3 to which the method for detecting the position of a radio mobile station of the present invention is applied will be described with reference to FIG. In addition to FIGS. 1 and 7 of Embodiment 2, FIG. 9 shows a configuration of a mobile station according to Embodiment 3 of the wireless communication system to which the position detecting method of the present invention is applied. In FIG. 9, reference numeral 901 denotes a mobile station corresponding to the mobile station 101 of FIG.
Reference numeral 2 denotes a communication control unit that controls communication with the base station, 903 denotes a control unit that performs measurement control of electric field strength and issues a communication instruction to the communication control unit 902, and 904 denotes a terminal characteristic storage unit that controls characteristics of the own terminal. .

Information held in the terminal characteristic storage unit 904 is as follows:
This is the same as the terminal characteristic value measured in terminal characteristic storage section 705 in FIG. 7 of the second embodiment. At the time of position detection, the control unit 903 of the mobile station 901 measures the electric field strengths of a plurality of peripheral base stations. The control unit 903 transmits the measured electric field intensity data and the characteristic values held in the terminal characteristic storage unit 904 to the position detection device 701 of the position information center 133 via the communication control unit 902. Position detector 7 of position detector 701
In 03, when the field intensity data and the characteristic value of the terminal are transmitted from the mobile station, the transmitted terminal characteristic value is compared with the reference value of the reference terminal held in the terminal characteristic storage unit, and the difference is transmitted. The position is estimated by comparing the electric field intensity data with the data in the electric field intensity data storage unit 702 using the corrected data.

As described above, when the terminal is provided with the terminal characteristic storage unit and the terminal characteristic is transmitted at the same time as the position is detected, the terminal characteristic can be obtained without knowing the terminal characteristic in advance in the position detecting device.
Further, even when the terminal characteristics change over time, it is possible to easily reduce a decrease in position accuracy due to the terminal characteristics without changing data in the position detecting device. Here, the description has been made using the average of the base station electric field strength that can be captured at a specific position as the terminal characteristic value possessed by the mobile station. It is apparent that the same result can be obtained even if the mobile station corrects the electric field strength data measured by the mobile station and transmits it to the position detecting device.

(Embodiment 4) Referring to FIG. 10, a position detection method for a radio mobile station according to the present invention is applied to Embodiment 4.
The operation of the wireless communication system in the above will be described. FIG.
Is a system for detecting the position of a mobile station based on the electric field strengths from a plurality of base stations, corresponding to the position detection device 135 in FIG. 15 shows a configuration example of a position detection system according to Embodiment 4 of the system. In FIG. 10, 10
Reference numeral 01 denotes a position detection device similar to the position detection device 135 in FIG. 1. Reference numeral 1002 denotes a state management unit that manages a state using a time stamp as a key. Reference numeral 1011 denotes a comparison between the electric field intensity data and the electric field intensity at a position to be detected. When the position detection unit 1012 having the means for estimating the execution position is requested to generate data from the position detection unit 1011, the state-specific electric field intensity data generation unit 1013 generates electric field intensity data according to the state, and the position detection unit 1013 outputs a base station or a fault. A map data storage unit 1014 that holds the position of an object and is used when the state-specific electric field strength data generation unit 1012 generates data is a state-specific electric field generated or generated by the state-specific electric field strength data generation unit 1012. The intensity data storage unit 1015 stores the electric field intensity reported from the mobile station by the position detection unit 1011 and the electric field intensity data storage unit for each state. An error field strength data storage section for holding a small electric field intensity data of a plurality of error comparing over data.

In the wireless communication system according to the present embodiment, the operation from the time when the position detecting device 1001 reports the received electric field intensity from the mobile station to the time when the position is detected using the electric field intensity data corresponding to the state is shown in FIG. This will be described with reference to the flowchart of FIG. The position detection unit 1011 of the position detection device 1001 receives a position detection request from a mobile station (Step 1101). Here, the mobile station reports the field strength data of the peripheral base station and the received time stamp from the mobile station. The position detection unit 1011 passes the time stamp reported from the mobile station to the state management unit 1002, and inquires about the state at that time (step 1102). The state is defined as a model in which the radio wave condition from the surrounding base station changes, and is recognized by a state number or the like.

FIG. 12 is a diagram showing an example of the construction of a radio communication system at a certain station and an example of the state of train entry at that station. For example, in a station as shown in FIG. 12, it is possible to assume a model that classifies the state according to whether or not a train has entered the first to fourth lines. FIG. 13 is a table showing the correspondence between the train entry state and the state number at the station shown in FIG.

In this table, .largecircle. Indicates a state where a train has entered the line, and X indicates a state where no train has entered.
As shown in FIG. 12, when a train enters only the third line,
The state number is "2" from the table. Now position detector 1
Assuming that a state 2 is obtained from the state management unit 1002 in 011, the position detection unit 1011 checks whether the electric field intensity data of the state 2 exists in the electric field intensity storage unit 1014 for each state (step 1103).
When the electric field intensity data of state 2 exists in the electric field intensity storage unit for each state 1014, the position detecting unit 1011 estimates the position by using the electric field intensity data of that state and comparing it with the received electric field intensity reported from the mobile station. State-specific electric field strength storage unit 101
If the field intensity data of state 2 does not exist in No. 4, the position detection unit 1011 instructs the state-specific electric field strength data generation unit 1012 to generate the field intensity data of state 2.

When the electric field intensity data generation unit 1012 receives an instruction to generate electric field intensity data from the position detection unit 1011, the geographic information of the map data storage unit 1013 and the basic data stored in the electric field intensity data storage unit 1014 are stored. ,
Here, the electric field intensity data of the designated state is generated from the data of the state 0. FIG. 12 shows a map data storage unit 1013.
Shows an example of the map information held by. Based on such map information, the location of the platform and each track, measurement points in the area,
It is assumed that the position of the base station and the stop position of the train in each state can be recognized. State-specific electric field strength data storage unit 10
Here, the basic data held at 14 is a state in which no train enters, that is, a state of state 0 in FIG. 13, and holds electric field intensity data measured at each measurement point in the area when there is no train. A method of generating the field intensity data of state 3 from the map information of the map data storage unit 1013 and the basic data of state 0 stored in the state-specific electric field intensity data storage unit 1014 will be described with reference to the example of FIG.

The electric field intensity data in the state 0 is obtained by measuring the electric field intensity from the peripheral base station j times (for example, 10 times) at the measurement points P1 to P30 in the area and storing it. The state-specific electric field strength data generation unit 1012 provides, at each point in the area,
In the designated state, it is calculated whether or not the direct wave from each base station is blocked by the train. FIG. 14 shows how a direct wave arrives from the base station at a certain point Pi in the area in state 3. Direct waves signal1 and signal2 from base stations BS1 and BS2 arrive without interruption,
Direct waves signal3 and signal4 from BS3 and BS4 are blocked by the train entering line 3. As described above, when the wave is directly interrupted by an obstacle such as a train, a value obtained by multiplying the electric field intensity value from the base station by a constant rate is newly provided as the data of state 3. The constant rate is about 70% to 90%,
Since the rate varies depending on the material of the obstacle and the surrounding environment, an appropriate value is selected according to the environment. In this way, the electric field intensity data of state 3 is newly generated by correcting the electric field intensity of the base station at all points and all measurement times in the area based on the map information (step 1104).

The position detecting unit 1011 stores the received electric field intensity reported from the mobile station and the state-specific electric field intensity data storage unit 101.
The data is compared with the electric field intensity data in state 3 held in step 4, and as a result of the comparison, the nearest k data are extracted and stored in the error electric field intensity data storage unit 1015 (step 1105). Finally, the position detection unit 1011 stores the k
Statistical processing such as weighted averaging is performed from the number of points and error information to estimate a position (step 1106).

In this way, when the radio wave environment is greatly affected, such as the state of the train entering, the electric field intensity data corresponding to the state is selected by cooperating with the state management unit for managing the state. The influence of the state change on the position detection accuracy can be reduced, and the position detection accuracy can be improved. Also, basic data that does not block radio waves from the base station is stored in the electric field strength data storage unit for each state, and the location of the base station and measurement points and obstacle position information that blocks the radio waves for each state are stored in the map data storage unit. It is possible to automatically calculate and generate the electric field intensity data in each state from these, without measuring the electric field intensity at all the measurement points in the area for every state pattern, the electric field intensity data according to the state , It is possible to perform highly accurate position detection even if an obstacle exists.

(Embodiment 5) The operation of the radio communication system according to Embodiment 5 to which the method for detecting the position of a radio mobile station according to the present invention is applied will be described with reference to FIGS. FIG. 15 shows the configuration of a mobile station according to Embodiment 5 of the wireless communication system to which the position detection method of the present invention is applied in the configuration of the wireless communication system as shown in FIG. 1 of Embodiment 1.

In FIG. 15, reference numeral 1501 denotes the first embodiment.
1, 1502 is a communication control unit for controlling communication with the base station, 1503 is a control unit for performing measurement control of electric field strength and giving a communication instruction to the communication control unit 1502, and 1504 is a mobile unit for moving the mobile station. It is a moving speed detecting unit that detects a speed. FIG. 16 shows a terminal speed history storage for storing the time when the position information is reported from each mobile station, the moving speed at that time, and the detected position for each terminal in addition to the configuration of the position detecting device 201 of FIG. A part 1605 is added.

In the wireless communication system according to the present embodiment, the mobile station 1501 reports the moving speed of its own terminal and the electric field strength from the peripheral base station, and the position detecting device 1601
A description will be given of the operation up to detecting the position using the received electric field strength and speed information from the mobile station 1501. Note that the flow of the electric field strength report between the mobile station 1501 and the position detecting device 1601 is the same as the configuration of the wireless communication system in FIG. The moving speed detector 1504 of the mobile station 1501 detects the moving speed of the mobile station at regular intervals such as every 30 seconds. For example, a pedometer (registered trademark)
For example, there is a method of multiplying the number of steps within a certain time that can be detected by the average step length, but the method is not particularly described here. At the time of position detection, the control unit 1503 of the mobile station 1501 measures the electric field strength of a plurality of peripheral base stations. The control unit 1503 transmits the measured electric field strength data, the time stamp, and the moving speed of the mobile station detected by the moving speed detecting unit 1504 to the position detecting device 1601 of the position information center 133 via the communication control unit 1502. Position detecting section 1603 of position detecting apparatus 1601 receives a position detection request from a mobile station. Here, the field intensity data of the peripheral base station, the received time stamp, and the moving speed of the mobile station are reported from the mobile station. The position detecting section 1603 stores the received electric field strength and the electric field strength data storage section 1 reported from the mobile station.
The data is compared with the electric field intensity data of all points and all measurement times held in 602, and as a result of the comparison, the nearest k data are stored in the error electric field intensity data storage unit 1604. The position detection unit 1603
Statistical processing is performed on these k detected positions to estimate the position of the mobile station.

The position detector 1603 stores the estimated position information of the mobile station, the time stamp at that time, and the moving speed in the terminal speed history storage 1605. Even when an inquiry about the terminal position is received from another person via a network or the like, by providing the movement speed information in addition to the position information of the mobile station, the receiver can easily predict the next action of the mobile station. Next, assuming that the history information of each mobile station has already been stored in the terminal speed history storage unit 1605, a method of estimating the position of the mobile station with higher accuracy using these history information will be described. It is assumed that the movement history of the terminal A stored in the terminal speed storage unit 1605 is as follows. (T1, S1, X1, Y1) (Ti, Si, Xi, Yi) Here, the time interval of the time stamp Ti is a sufficiently short interval that does not frequently change the moving speed.

As the moving speed Si, a minute speed or the like is used, and the moving speed is classified into the following three speeds. Walking speed: 40 m / min or more Wandering speed: 5 to 40 m / min Stop: 0 to 5 m / min

Assume that the position of the mobile station at the time stamp Ti + 1 has been estimated. An example of a method for verifying whether the estimated position is appropriate using the moving speed at this time will be described. When the moving speed Si of Ti is the walking speed and the moving speed Si + 1 of Ti + 1 is also the walking speed, it is considered that these estimated two points are located at positions separated by the moving distance of the walking speed. When the moving speed Si + 1 of Ti + 1 becomes the scanning speed, it is considered that the moving speed is reduced from the position of Ti and the position is about the distance of the scanning speed. Further, when the moving speed Si + 1 of Ti + 1 stops, it is considered that the vehicle is near the position of Ti. In addition, if the moving speed Si of Ti is the fishing speed and the moving speed Si + 1 of Ti + 1 is also the fishing speed, it can be predicted that the user is strolling in a certain area. If the moving speed Si of Ti is stopped and the moving speed Si + 1 of Ti + 1 is also stopped, the respective positions should be detected nearby. Based on such an assumption, it is possible to correct the detection position from two or more pieces of information, and position detection can be performed with higher accuracy. As the correction method, various methods are conceivable, such as correction within the range of the moving speed, and taking a weighted average of two times at the time of stopping, but this is not specified here. Although the example using the immediately preceding time stamp has been described here, it is clear that the effect of further improving the accuracy can be expected by using three or more histories. Also, it is assumed here that the user does not ride on a vehicle.However, when the moving speed is stopped, whether or not the mobile station is moving at a high speed, such as a vehicle, depends on whether the received electric field strength from the surrounding base station that can be received by the mobile station is greatly changed. It is also possible to determine whether or not.

In this way, by storing the position information of the mobile station estimated by the position detecting device, the time stamp at that time, and the moving speed by providing the terminal speed history storage unit,
By providing the speed information of the mobile station in addition to the location information of the mobile station when an inquiry about the terminal location is received from another person through a network or the like, the receiver can easily predict the current state and the next action of the mobile station. Furthermore, it is possible to accumulate such information, and to correct the detection position based on the history thereof, based on the speed information of two or more times, using the moving distance of the mobile station as a guide.
Position detection can be performed with higher accuracy.

[0062]

As described above, according to the position detecting method of the present invention, first, it is used in a mobile radio communication system for performing radio communication between a mobile station and a base station, In the position detection method of holding the received electric field strength data captured from the surrounding base station at a plurality of measurement points, and comparing the held electric field strength data with the electric field strength at the point where the position is to be detected to estimate the position, If the number of field strengths that can be received and reported by the mobile station is limited, for each point, for the base station that may or may not be captured, of the stored field strength data to be compared at the time of location detection By performing position detection by complementing the electric field intensity of a base station that cannot capture electric field intensity data for each same measurement point, the received electric field intensity data at the time of Variation in received electric field intensity in the case of determining the error was held electric field intensity data as a criterion for the position can be suppressed. As a result, it is possible to improve the accuracy of position detection.

Secondly, a terminal characteristic storage unit is provided in the position detecting device, and the characteristic value of the mobile station serving as a reference and the characteristic value of the terminal whose position is to be detected are held. By subtracting the characteristic value unique to the terminal from the electric field intensity value of each electric field intensity data, it is possible to improve the detection position accuracy by using the standardized electric field intensity data of the mobile station excluding the terminal characteristics.

Third, if a terminal characteristic storage unit is provided in the terminal of the mobile station and the terminal characteristics are transmitted at the same time as the position is detected, the terminal characteristics may not be known in advance in the position detecting device, and the terminal characteristics may be stored at the same time. Even if the terminal characteristics change with the passage of time, it is possible to easily reduce a decrease in position accuracy due to the terminal characteristics without changing the position detection device.

Fourth, in the case where the radio wave environment is greatly affected, such as a train incoming state, the state-by-state electric field strength data is stored in cooperation with a state management unit that manages the state. By selecting the electric field intensity data according to the state from the storage unit, the influence of the state change on the position detection accuracy can be reduced, and the position detection accuracy can be improved.

Fifth, the position detecting device is provided with a state-specific electric field strength data storage section for holding electric field strength data for each state such as radio wave environment, and the state-specific electric field strength data storage section stores basic data which does not block radio waves from the base station. By holding the location information of base stations and measurement points in the map data storage unit and the position information of obstacles that block radio waves for each state, electric field strength data in each state can be automatically calculated and generated from these. It is possible to perform accurate position detection even if there is an obstacle using electric field intensity data according to the state without measuring electric field intensity at all measurement points in the area for every state pattern Is possible.

Sixth, a terminal speed history storage unit is provided in the position detection device, and the position information of the mobile station estimated by the position detection unit, the time stamp at that time, and the movement speed are stored in the terminal speed history storage unit. By providing mobile station speed information in addition to mobile station location information when an inquiry is received from another company through a network or the like,
The receiver can easily predict the current state of the mobile station and the next action.

Seventh, using the speed history information stored in the terminal speed storage unit, it is possible to correct the detection position from the speed information of the terminal using the moving distance of the mobile station as a guide,
Position detection can be performed with higher accuracy.

[Brief description of the drawings]

FIG. 1 is a system block diagram illustrating a schematic configuration of a wireless communication system to which a position detection method according to a first embodiment is applied.

FIG. 2 is a block diagram showing a configuration of a position detecting device in a wireless communication system to which the position detecting method according to the first embodiment is applied.

FIG. 3 is a diagram showing an example of measured electric field strength at a certain measurement point A in a wireless communication system to which the position detection method according to the first embodiment is applied.

FIG. 4 is a diagram showing an example of an electric field strength acquisition value at a measurement point A in a wireless communication system to which the position detection method according to the first embodiment is applied;

FIG. 5 is a diagram showing an average value of a captured electric field strength obtained from the measurement values of FIG. 3 at a measurement point A in a wireless communication system to which the position detection method according to the first embodiment is applied.

FIG. 6 is a diagram showing an example of a complementary electric field strength value at a measurement point A in a wireless communication system to which the position detection method according to the first embodiment is applied.

FIG. 7 is a block diagram showing a configuration of a position detecting device in a wireless communication system to which a position detecting method according to a second embodiment of the present invention is applied;

FIG. 8 is a diagram showing a mode of measuring reference data in a wireless communication system to which the position detecting method according to the second embodiment is applied.

FIG. 9 is a block diagram illustrating a configuration of a mobile station in a wireless communication system to which a position detection method according to a third embodiment of the present invention is applied.

FIG. 10 is a block diagram showing a configuration of a position detection system in a wireless communication system to which a position detection method according to a fourth embodiment of the present invention is applied.

FIG. 11 is a flowchart illustrating a position detection processing operation in a wireless communication system to which the position detection method according to the fourth embodiment is applied.

FIG. 12 is a diagram showing an example of map information in a wireless communication system to which the position detection method according to the fourth embodiment is applied.

FIG. 13 is a diagram showing a correspondence between a train entry state and a state number in a wireless communication system to which the position detection method according to the fourth embodiment is applied.

FIG. 14 is a diagram showing an example of direct wave observation from a peripheral base station at a point Pi in a wireless communication system to which the position detection method according to the fourth embodiment is applied.

FIG. 15 is a block diagram showing a configuration of a mobile station in a wireless communication system to which a position detection method according to a fifth embodiment of the present invention is applied.

FIG. 16 is a block diagram showing a configuration of a position detecting device in a wireless communication system to which the position detecting method according to the fifth embodiment is applied.

FIG. 17 is a block diagram illustrating a conventional position detection method for a wireless mobile station.

[Explanation of symbols]

 Reference Signs List 101 mobile station 111 to 126 radio wave intensity measurement unit 131 communication control unit 132 network 133 position information center 134 communication control unit 135 position detection device 201 position detection device 202 electric field intensity data storage unit 203 position detection unit 204 error electric field intensity data storage unit 701 Position detection device 702 Field strength data storage unit 703 Position detection unit 704 Error field strength data storage unit 705 Terminal characteristics storage unit 801 Mobile station 802 Base station 901 Mobile station 902 Communication control unit 903 Control unit 904 Terminal characteristics storage unit 1001 Position detection device 1002 state management unit 1011 position detection unit 1012 state-specific electric field intensity data generation unit 1013 map data storage unit 1014 state-specific electric field intensity data storage unit 1015 error electric field intensity data storage unit 1501 mobile station 1502 communication control unit 1503 control unit 1504 moving speed detection unit 1601 position detection device 1602 electric field intensity data storage unit 1603 position detection unit 1604 error electric field intensity data storage unit 1605 terminal speed history storage unit

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5J062 AA08 AA12 BB01 BB05 CC14 CC18 FF00 5K067 AA33 BB04 DD44 EE02 EE10 EE24 HH21 HH22 HH23 JJ52

Claims (12)

[Claims] 1. A mobile radio communication system for performing radio communication between a mobile station and a base station. The mobile field communication system holds received electric field strength data captured from a peripheral base station at a plurality of measurement points in an area. In the position detecting method for estimating a position by comparing the held electric field intensity data with the electric field intensity at a point where the position is to be detected, the stored electric field intensity data to be compared at the time of position detection, for each of the same measurement points, A position detection method for a wireless mobile station, wherein the position detection is performed by complementing the electric field intensity of a base station that cannot capture electric field intensity data. 2. A mobile radio communication system for performing radio communication between a mobile station and a base station, wherein the mobile station holds received electric field intensity data captured from a peripheral base station at a plurality of measurement points in an area, In the position detection method of estimating a position by comparing the held electric field intensity data with the electric field intensity at a point to be detected, the reference terminal and the terminal characteristics of the reference terminal measuring the received electric field intensity data and other mobile station terminals A position detecting method for a wireless mobile station, wherein characteristics are stored, and when a field intensity is reported from a mobile station, a position is detected by removing terminal characteristics from the reported field intensity data. 3. Used in a mobile radio communication system for performing radio communication between a mobile station and a base station, holding received electric field strength data captured from peripheral base stations at a plurality of measurement points in an area, In the position detection method of estimating the position by comparing the held electric field intensity data with the electric field intensity at the position to be detected, when the radio wave condition changes depending on the presence or absence of an obstacle at a plurality of measurement points in the area. The position detection is performed by holding the received electric field intensity data captured from the surrounding base station for each state, comparing the electric field intensity data according to the state with the electric field intensity data at the point to be detected, and estimating the position. A method for detecting a position of a wireless mobile station. 4. It is also desirable to hold error electric field intensity data that holds a plurality of electric field intensity data with a small error, manage a state that changes with time, and detect electric field intensity data corresponding to the state and position detection. 4. The position detecting method for a wireless mobile station according to claim 3, wherein the position is detected by cooperating with a comparison operation with the electric field intensity data at the point. 5. A position detecting device of a mobile radio communication system for performing wireless communication between a mobile station and a base station, wherein the position detecting device holds received electric field intensity data captured from a peripheral base station at a plurality of measurement points in an area. Electric field intensity data storage unit, a position detection unit that compares the electric field intensity data in the electric field intensity data storage unit with the electric field intensity at a point to be detected, and estimates a position, and holds a plurality of electric field intensity data with small errors. An error electric field intensity data storage unit, wherein the position detection unit cannot capture an electric field for each same measurement point among electric field intensity data of an electric field intensity data storage unit that holds electric field intensity data to be compared at the time of position detection. A position detecting device for a wireless mobile station, wherein a position detecting process is performed by complementing a base station electric field intensity with captured electric field intensity data. 6. The position detecting device for a wireless mobile station according to claim 5, wherein the complementary electric field intensity data is obtained by calculating an average value of electric field intensity of a base station that cannot capture an electric field. 7. A position detecting device of a mobile radio communication system for performing radio communication between a mobile station and a base station, wherein the position detecting device holds received electric field strength data captured from a peripheral base station at a plurality of measurement points in an area. An electric field intensity data storage unit, a position detection unit having means for comparing the electric field intensity data of the electric field intensity data storage unit with the electric field intensity at a point to be detected, and estimating a position; and a plurality of electric field intensity data with small errors. An error electric field strength data storage unit for storing the data stored in the electric field strength storage unit, a terminal characteristic storage unit for storing the characteristics of the reference terminal and its terminals, and other characteristics of the mobile station terminal, which are measured from the electric field strength storage unit. A position detecting device for a radio mobile station, wherein a position is detected by removing a terminal characteristic from reported electric field intensity data when an electric field intensity is reported. 8. A mobile station comprising terminal characteristic storage for storing characteristics of a mobile station terminal, instead of including a terminal characteristic storage unit in the position detection device, wherein the position detection device includes terminal characteristic data together with electric field strength data at the time of position detection. The position detection method of a wireless mobile station according to claim 7, wherein the position is detected by receiving the position information from the mobile station. 9. A position detecting device for a mobile radio communication system for performing radio communication between a mobile station and a base station, wherein a radio wave condition changes at a plurality of measurement points in an area depending on the presence or absence of an obstacle. In each case, the state-specific electric field strength data storage unit that stores the received electric field intensity data captured from the surrounding base station for each state, and the state-specific electric field strength data that is stored in the state-specific electric field strength data storage unit A position detector for estimating the position by comparing the electric field intensities of; an error electric field intensity data storage unit for holding a plurality of electric field intensity data with a small error; and a state management unit for managing a state that changes with time, A position detecting device for a wireless mobile station, which performs position detection according to a changing state. 10. A map data storage unit for holding a position of a base station or a measurement point of electric field intensity data or a position of an obstacle such as a train, and a reference electric field intensity such that no obstacle exists in the electric field intensity data storage unit for each state. A state-by-state electric field strength data generator having means for generating state-specific electric field strength data from the electric field strength data based on the electric field strength data, and performing position detection using the state-dependent data. The position detecting device for a wireless mobile station according to claim 9. 11. A mobile radio communication system for performing radio communication between a mobile station and a base station, wherein the mobile station includes a moving speed detecting unit for detecting a moving speed of the mobile station, State-specific field strength data storage unit that stores received field strength data from peripheral base stations measured at multiple measurement points in the area, and field strength data stored in the field strength data storage unit and movement at the point where you want to detect the position A position detection unit having means for comparing the electric field strength reported from the station and estimating the position, a terminal speed history storage unit for storing the moving speed of the mobile station and the position information of the mobile station reported from the mobile station, An error electric field intensity data storage unit for holding a plurality of electric field intensity data having a small error, wherein a moving speed state at the time of position detection is provided in response to an inquiry from another person. Position detecting apparatus of the line mobile station. 12. At the time of position detection, position detection is performed using a position detected from the electric field intensity reported from the mobile station by the position detection unit of the position detection device and a terminal speed history in the terminal speed history storage unit. The position detecting device for a wireless mobile station according to claim 11, wherein: