JP2001275148A - Distance measurement method and system in mobile communication system and, method and system for measuring position of mobile station - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a position measurement method and system for mobile unit that can always and accurately identify the position of the mobile unit to the utmost even when a communication state between the mobile station and each base station is changed in various ways. SOLUTION: In the distance measurement method in the mobile communication system where a prescribed signal is sent and received between the base station and the mobile unit in the mobile communication system and distance data between the base station and the mobile unit can be calculated on the basis of a reception state of the prescribed signal by the base station or the mobile unit, the distance data to be obtained in prescribed timing from the distance data on the basis of the reception state of the prescribed signal obtained in a plurality of timings in the communication between the base station and the mobile unit are estimated, minimum distance data are selected from the distance data on the basis of the reception state of the prescribed signal obtained in the prescribed timing, and the distance data estimated as data to be obtained in the prescribed timing and the distance data in the the prescribed timing and the distance data in the prescribed timing are decided in the distance measurement method in the mobile communication system.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distance measuring method and apparatus for measuring a distance between a base station and a mobile station in a mobile communication system, and more particularly, to a predetermined distance between a mobile station and a base station. The present invention relates to a distance measuring method and system in a mobile communication system that transmits and receives a signal and obtains distance data based on a reception state of the predetermined signal at a base station or a mobile device.

[0002] The present invention also relates to a method and system for measuring the position of a mobile station in a mobile communication system. More specifically, the present invention transmits and receives a predetermined signal between the mobile station and each of a plurality of base stations. The present invention relates to a method and system for measuring the position of a mobile device, which specifies the position of the mobile device based on distance data obtained based on the reception state of a predetermined signal at each base station or mobile device.

[0003]

2. Description of the Related Art In a cellular mobile communication system,
Each mobile device (cellular phone, PHS terminal, etc.) communicates with surrounding base stations, and at this time, receives various communication services via a base station that transmits a signal having the highest reception level.

In recent years, various services have been proposed, such as detecting the position of a mobile device, tracking the mobile device (user), distributing information on the vicinity of the mobile device, and specifying the position of the mobile device user in an emergency. . When specifying the position of the mobile device at the position of the base station that communicates with the mobile device as described above,
Although it is known that the mobile station exists in the communication area of the base station, it is difficult to realize a service corresponding to the detailed location of the mobile station because the detailed location cannot be known.

Therefore, as a technique for detecting the position of the mobile device, a GPS (Global Positioning System) for detecting the position of the mobile device based on signals from a plurality of satellites is known. This GPS can detect the absolute position of the mobile device with relatively high accuracy without considering the positional relationship with the base station.

However, it is necessary to mount a function for realizing the GPS in the mobile device, which increases the cost and
When the position is constantly detected, the power consumption of the mobile device also increases. Further, when the mobile device is located indoors or in an urban area where buildings are densely packed, it becomes difficult to receive a positioning signal transmitted from a satellite, and the reliability of position detection is reduced. .

Another method that does not particularly have the drawbacks of such a mobile station position detection method using GPS is also known. In this method, communication is performed between a plurality of (three or more) base stations and a mobile station, a relative positional relationship between each base station and the mobile station is measured, and the mobile station and each base station are measured. The position of the mobile device is specified (positioned) by a method similar to the so-called triangulation based on the relative positional relationship between the mobile device and the absolute position of each base station. The relative positional relationship between the mobile station and the base station can be obtained, for example, based on the propagation time of a signal transmitted and received between the mobile station and the base station (TOA: Time of Arrival). It can be obtained based on the difference between the propagation times of signals transmitted and received between the mobile station and each base station (TDOA: Time Difference).
of Arrival), and can also be obtained based on the angle of reception at each base station of the signal transmitted from the mobile station (AO).
A: Angle of Arrival). Note that the reception angle at each base station of the signal transmitted from the mobile station can be detected by installing an array antenna at each base station and sectorizing the reception area at each base station.

Further, the intensity of the radio wave propagating in the air is
Since the signal is attenuated in proportion to the square of the distance, based on the ratio between the transmission signal level and the reception signal level of the signal transmitted / received between the mobile station and each base station, the mobile station and each base station receive the signal. The relative positional relationship between them can also be obtained.

[0009]

By the way, in a method of measuring a distance and a position of a mobile station by performing communication between the mobile station and a plurality of base stations, for example, as shown in FIG.
When radio waves used for communication between the mobile station MS and each base station BS include a direct wave (LOS: Line of sight) and a reflected wave from the building 10, the mobile station MS and each base station BS Since the propagation time and attenuation of the radio wave (direct wave) corresponding to the linear distance from the station BS can be measured, the accurate distance and the accurate position of the mobile station MS can be measured. However, as shown in FIG. 12, the radio waves used for communication between the mobile station MS and each base station BS are only reflected waves at the building 10, and the radio waves do not include direct waves. (NLOS: No Lin)
e of sight), it is not possible to measure the propagation time and attenuation of the radio wave corresponding to the linear distance between the mobile device MS and each base station BS, and to measure the accurate distance and the accurate position of the mobile device MS. Can not do.

[0010] In an actual mobile communication system, the communication situation between a moving mobile station and each base station varies in various ways, and there are situations in which radio waves used for the communication include direct waves and situations in which direct waves are not included. It can occur randomly. In such a situation, communication is performed between the mobile station and each base station, and the distance between the base station and the mobile station, the above-described TOA, TDO, and the like.
Even if the position of the mobile device is measured by the method A or the like, an accurate distance or position cannot always be obtained.

Therefore, a first object of the present invention is to make it possible to always measure the distance between a base station and a mobile station as accurately as possible, even if the communication situation between the mobile station and the base station changes. To provide a distance measurement method and system.

A second object of the present invention is to provide a mobile station capable of always specifying the position of the mobile station as accurately as possible even when the communication situation between the mobile station and each base station changes. It is to provide a position measuring method and system.

[0013]

According to the present invention, a predetermined signal is transmitted between a base station and a mobile station in a mobile communication system. A distance measuring method in a mobile communication system for transmitting and receiving, and calculating distance data between the base station and the mobile station based on a reception state of the predetermined signal at the base station or the mobile station. The distance data to be obtained at a predetermined timing is estimated from the distance data based on the reception state of the predetermined signal obtained at a plurality of timings in the communication between the mobile device and the mobile device. The minimum distance data is selected from the distance data based on the reception state of the predetermined signal and the distance data estimated as the distance data to be obtained at the predetermined timing. Configured to determine the distance data at a predetermined timing.

In such a distance measuring method in a mobile communication system, a predetermined signal is transmitted and received between a base station and a mobile station. In each communication, distance data to be obtained at a predetermined timing is estimated from each of the distance data based on the reception state of the predetermined signal obtained at a plurality of timings. Then, the minimum distance data from the distance data based on the reception state of the predetermined signal obtained at the predetermined timing and the distance data to be obtained at the predetermined timing is determined as the distance data at the predetermined timing. .

Communication between the mobile station and the base station is performed by a radio wave in which a direct wave (LOS) and a reflected wave are mixed or a radio wave including only a reflected wave (NLO).
S). When communication between the mobile station and the base station is performed using radio waves including only the reflected waves (NLOS), predetermined signals are transmitted and received using such radio waves, and based on the reception state. The obtained distance data represents a distance longer than the actual distance. That is, the error of the distance data obtained based on the reception state of the predetermined signal used for the communication between the mobile station and the base station always appears in a direction larger than the actual distance.

As described above, the error of the distance data obtained based on the reception state of the predetermined signal used for the communication between the mobile station and the base station always appears in a direction larger than the actual distance. The minimum distance data selected from the distance data estimated as the distance data to be obtained at the predetermined timing and the distance data based on the reception state of the predetermined signal obtained at the predetermined timing is more error-prone. It becomes less distance data.

The reception state of the predetermined signal as a basis for obtaining the distance data is not particularly limited as long as the reception state depends on the propagation distance when the predetermined signal propagates. The ratio of the reception level to the transmission level of the predetermined signal, the delay of the reception timing with respect to the transmission timing of the predetermined signal, and the like can be used as the reception state.

If the distance data estimation algorithm estimates distance data in consideration of a time difference between a predetermined timing and each of a plurality of timings,
There is no particular limitation.

From the viewpoint that distance data can be easily estimated on the assumption that the moving direction and the moving speed of the mobile device can be considered to be constant within a relatively short time, the present invention provides:
As described in claim 2, in each of the distance measurement methods, the average speed of the mobile station in the direction of the base station based on the distance data based on the reception state of the predetermined signal obtained at a plurality of timings. , Distance data based on the reception state of the predetermined signal obtained at each of the plurality of timings, the time between the timing corresponding to the obtained distance data and the predetermined timing, and the movement The distance data to be obtained at the predetermined timing can be estimated based on the average speed of the aircraft.

In such a distance measuring method, distance data based on the reception state of a predetermined signal obtained at a plurality of timings changes with the movement of the mobile device. From the distance data obtained at such a plurality of timings, an average speed of the mobile device that can be regarded as moving at a constant direction and a constant speed is calculated. Then, from the time between each of the plurality of timings and the timing and the average speed of the mobile device, distance data corresponding to the moving distance of the mobile device from each timing to the timing can be obtained. From the distance data based on the reception state of the predetermined signal obtained at the corresponding timing, the distance data to be obtained at the predetermined timing can be estimated.

The calculation method for calculating the average speed of the mobile device is as follows, as long as the average speed in the predetermined direction of the mobile device can be regarded as moving at a constant speed at a constant direction.
The present invention is not particularly limited, and may be a square mean, a simple mean, or a weighted mean in consideration of reception quality at a plurality of timings.

As described above, when communication between a mobile station and a base station is performed by radio waves including direct waves (LO
S) In some cases, the communication is performed by a radio wave including only a reflected wave that does not include a direct wave (NLOS). In such a situation, when the communication between the mobile station and the base station changes from a situation where the communication is performed by radio waves not including direct waves to a situation where communication is performed by radio waves including direct waves, the reception quality of the radio waves ( For example, reception level, error rate, etc.) are improved. As described above, if it is known that the communication between the mobile station and the base station is performed by radio waves including direct waves, the distance data obtained based on the reception state and the reception state may be relatively accurate. I understand. In view of this, according to the present invention, in each of the distance measuring methods, the reception quality of the predetermined signal obtained at the predetermined timing is improved by a predetermined reference or more. At this time, the distance data based on the reception state of the predetermined signal obtained at the predetermined timing may be determined as the distance data at the predetermined timing.

In such a distance measuring method, when the reception quality of the predetermined signal obtained at the predetermined timing is improved by a predetermined reference or more, the communication between the mobile station and the base station is performed by the predetermined time. At the timing, it can be determined that the state is changed from a state performed by radio waves not including direct waves to a state performed by radio waves including direct waves. In this case, distance data based on the reception state of the predetermined signal obtained at the timing is determined as distance data at the predetermined timing.

From the viewpoint that more accurate distance data can be obtained, the present invention provides a method for estimating distance data to be obtained at the predetermined timing in each of the above distance measurement methods. Instead of the distance data based on the reception state of the predetermined signal obtained at a timing earlier than the predetermined timing among the plurality of timings, the distance data has already been determined at the timing before the predetermined timing. It can be configured to use distance data.

In such a distance measuring method, distance data corresponding to a timing before a predetermined timing is already obtained according to the method. When the plurality of timings include a timing before the predetermined timing, the already obtained distance data is used when estimating the distance data to be obtained at the predetermined timing.

Since the distance represented by the distance data already obtained according to the method is relatively close to the actual distance, the accuracy of the distance data to be obtained at the predetermined timing estimated using such distance data is also low. improves.

According to another aspect of the present invention, there is provided a mobile communication system for transmitting and receiving a predetermined signal between a base station and a mobile station in a mobile communication system. In a distance measurement system in a mobile communication system configured to calculate distance data between the base station and the mobile device based on a reception state of the predetermined signal at the base station or the mobile device, the base station and the mobile device Distance estimating means for estimating distance data to be obtained at a predetermined timing from distance data based on the reception state of the predetermined signal obtained at a plurality of timings in communication between The distance data based on the received state of the predetermined signal and the distance data estimated by the distance estimating means as the distance data to be obtained at the predetermined timing. It constituted the smallest distance data so as to have a distance data determining means for determining as the distance data at the predetermined timing.

In order to solve the second problem, the present invention provides a mobile communication system for transmitting and receiving a predetermined signal between a mobile station and a plurality of base stations in a mobile communication system. Received, in a mobile station position measurement method in a mobile communication system to identify the position of the mobile device based on the distance data obtained based on the reception state at each base station or mobile device of the predetermined signal, Estimate distance data to be obtained at a predetermined timing from each of the distance data based on the reception state of the predetermined signal obtained at a plurality of timings in communication between each base station and the mobile station, The distance data based on the reception state of the predetermined signal obtained at the predetermined timing and the distance data estimated as the distance data to be obtained at the predetermined timing Select Luo minimum distance data to determine the distance data in the predetermined timing, configured to identify the location of a mobile terminal in the predetermined timing based on the distance data said determined.

In the method of measuring the position of a mobile device in such a mobile communication system, more accurate distance data between each base station and the mobile device is determined by the above-described distance measurement method, and the determined data is determined. The position of the mobile device at the predetermined timing is specified based on each distance data.

The distance data may be any data that indicates the distance used to specify the position of the mobile station, and may be data indicating the distance between the mobile station and the base station (data used in TOA). Or data representing the difference in distance between the mobile station and each base station (data used in TDOA).

If the above distance data estimation algorithm estimates distance data in consideration of a time difference between a predetermined timing and each of a plurality of timings,
There is no particular limitation.

As described above, the error of the distance data obtained based on the reception state of the predetermined signal used for communication between the mobile station and each base station always appears in a direction larger than the actual distance. . In view of the fact that the position of the mobile device can be more accurately specified using such properties, the present invention provides a method for measuring the position of each mobile device, wherein the mobile device Each of the plurality of distance data obtained as distance data used to identify the position of the mobile device by performing communication with the plurality of base stations, the position of the mobile device within a predetermined error range As specified, it can be configured to reduce by a predetermined ratio.

In such a method for measuring the position of a mobile station, the same number of distance data as that of the base station are used as distance data used for specifying the position of the mobile station by communication between the mobile station and a plurality of base stations. Obtained. The plurality of distance data are reduced at a predetermined ratio so that the position of the mobile device is specified within a predetermined error range. In this case, since the error of the distance data used to specify the position of the mobile device always appears in a direction larger than the actual distance as described above, a predetermined error range is obtained by the distance data thus reduced. The location of the mobile station identified within will be more accurate.

From the viewpoint that each of the plurality of distance data can be easily reduced so that the position of the mobile station can be specified within a predetermined error range, the present invention provides:
According to a fourteenth aspect of the present invention, in the method for measuring the position of the mobile device, the operation of reducing the plurality of distance data at a predetermined ratio is performed such that the position of the mobile device is specified within a predetermined error range. Then, it can be configured to be repeatedly performed.

In such a method of measuring the position of a mobile station, the distance data is obtained such that the position of the mobile station is specified within a predetermined error range by repeating the operation of reducing the distance data at a predetermined ratio. be able to.

Further, as described above, the error of the distance data obtained based on the reception state of the predetermined signal used for the communication between the mobile station and each base station is always larger than the actual distance. Appears in Using such properties,
In order to solve the second problem of the present invention, according to the present invention, a predetermined signal is transmitted and received between a mobile station and each of a plurality of base stations in a mobile communication system as described in claim 15. Then, the position of the mobile device is specified based on distance data representing the distance between the mobile device and each base station obtained based on the reception state of the predetermined signal at each base station or mobile device. In the method for measuring the position of a mobile device in a mobile communication system, the distance data representing the distance between the mobile device and each base station obtained based on the reception state of the predetermined signal is used to calculate the position of the mobile device at a predetermined position. It is configured to decrease at a predetermined ratio so as to be specified within the error range.

In such a method for measuring the position of a mobile station, a predetermined signal is transmitted and received between the mobile station and each of the plurality of base stations, and the mobile station and each base station are connected based on the reception state. Is obtained. The error of each distance data appears in a direction that becomes larger than the distance between the mobile device and each base station. In such a situation, each distance data indicating the distance between the mobile device and each base station, such that the position of the mobile device is specified within a predetermined error range,
It is reduced by a predetermined ratio. As a result, the position of the mobile device specified within a predetermined error range by the reduced distance data becomes more accurate.

From the viewpoint that the distance data representing the distance between the mobile station and each base station can be easily reduced so that the position of the mobile station can be specified within a predetermined error range. According to another aspect of the present invention, in the method for measuring the position of the mobile station, the operation of reducing the distance data representing the distance between the mobile station and each base station at a predetermined ratio is performed by the mobile station. The apparatus may be configured to be repeatedly performed so that the position of the machine is specified within a predetermined error range.

Furthermore, in order to solve the second problem of the present invention, the present invention provides a mobile communication system in which a predetermined number of mobile stations and a plurality of base stations are provided. Transmitting and receiving the signal of the mobile station in the mobile communication system in which the position of the mobile station is specified based on the distance data obtained based on the reception state of the predetermined signal at each base station or the mobile station. In the position measurement system, distance data to be obtained at a predetermined timing from each of distance data based on the reception state of the predetermined signal obtained at a plurality of timings in communication between each base station and the mobile device Distance estimation means for estimating the distance, distance data based on the reception state of the predetermined signal obtained at the predetermined timing, and the distance to be obtained at the predetermined timing. Distance data determining means for determining the minimum distance data from the distance data estimated by the distance estimating means as the data at the predetermined timing, based on the distance data determined by the distance data determining means. Mobile device position specifying means for specifying the position of the mobile device at the predetermined timing.

[0040] In order to solve the second problem of the present invention, the present invention as defined in claim 23, provides a predetermined communication between a mobile station and each of a plurality of base stations in a mobile communication system. Transmits and receives signals, and determines the position of the mobile station based on distance data representing the distance between the mobile station and each base station obtained based on the reception state of the predetermined signal at each base station or mobile station. In the mobile station position measuring system in the mobile communication system, the distance data representing the distance between the mobile station and each base station obtained based on the reception state of the predetermined signal is stored in the mobile station. Is configured to have a calculating means for reducing the position by a predetermined ratio so that the position is specified within a predetermined error range.

[0041]

Embodiments of the present invention will be described below with reference to the drawings.

A mobile communication system to which the mobile station position measuring method according to one embodiment of the present invention is applied is configured, for example, as shown in FIG.

In FIG. 1, base stations (BS0, BS0) that perform wireless communication with a mobile device (for example, a portable telephone) 100
1, BS2) 200 is connected to a switching center (MSC) 300. The switching center (MSC) 300 is a control station (LC
It is connected to the computer device 400 of C). The computer device 400 can communicate with a terminal device (telephone, computer terminal, mobile device, etc.) 50 via a predetermined network (public telephone network, Internet, etc.) 500.

The mobile station (MS) 100 communicates with the surrounding base stations (BS0, BS1, BS2) 200, and at this time, the base station (eg, BS0) 200 that transmits the signal having the highest reception level. Recognize as the main base station. The mobile device 100 receives a communication service such as communication with an external communication terminal via the base station (BS0) 200 recognized as the main base station.

The mobile unit 100 is configured, for example, as shown in FIG.

In FIG. 2, mobile station 100 has an antenna duplexer 10 to which an antenna 110 for both transmission and reception is connected.
1, transmitting / receiving device 102, microphone 103, speaker 10
4. Display 105, keyboard 106 and control circuit 12
It has 0. The transmission / reception device 102 transmits / receives signals (voice signal, data signal, control signal) to / from the base station 200 via the antenna duplexer 101 and the antenna 110.
The control circuit 120 controls the transmission / reception device 102, processes a signal received by the transmission / reception device 102, and transmits a signal (control signal, data signal) to be transmitted to the transmission / reception device 10.
Feed to 2.

Note that the transmitting / receiving device 102 is connected to a microphone 103 and a speaker 104 which are input / output devices for audio signals. The control circuit 120 has a display 105 and a keyboard 1 serving as data signal input / output devices.
06 is connected.

Each base station 200 is configured, for example, as shown in FIG.

In FIG. 3, each base station 200 has an antenna duplexer 20 to which an antenna 210 for both transmission and reception is connected.
1. Transmission / reception device 202, transmission device 203, and control device 2
20. The transmission / reception device 202 transmits / receives signals (voice signal, data signal, control signal) to / from the mobile device 100 via the antenna duplexer 201 and the antenna 210. The transmission device 203 transmits the signal received by the transmission / reception device 202 to the switching center (MSC) 300, and
C) The transmission / reception device 2 transmits the signal to be transmitted input from 300
02. The control device 220 includes the transmitting / receiving device 202
And controls the transmission device 202 to process the signals received by the transmission / reception device 202 and to supply signals (control signals and data signals) to be transmitted to the transmission / reception device 202.

In the following description, mobile unit 100
Is a reference code of MS, and a reference code of each base station 200 is B
S0, BS1, and BS2, the reference code of the exchange 300 is MSC, and the reference code of the computer 400 of the control station (LCC) is LCC.

In the mobile communication system as described above,
Absolute location information (eg, longitude, latitude) from each base station BS0, BS1, BS2 via the switching center MSC
Is reported to the computer device LCC. Thus, the computer device LCC recognizes the absolute positions of the base stations BS0, BS1, and BS2.

A request to notify the position of a mobile station MS (specified by an MS address (such as a telephone number)) from the terminal apparatus 50 via the network 500 is sent to the computer apparatus L.
When the request is made to the CC, the request is transmitted from the computer device LCC to the base station BS0 (hereinafter, referred to as a main base station BS0 as required) which provides a communication service to the mobile station MS via the exchange MSC. You. And this request is
It is transmitted from the main base station BS0 to the mobile station MS using a predetermined channel.

The mobile station MS that has received this request, based on the reception level of the perch channel from the surrounding base stations, determines the three base stations BS0, BS1, and BS2 to perform position measurement (positioning) of the mobile station MS. To determine. Since the main base station BS0 has the best communication state with the mobile station MS,
It is included in three base stations to perform positioning. Then, B that specifies the determined base stations BS0, BS1, and BS2
A positioning request including the S address and the MS address specifying the mobile station MS is transmitted from the mobile station MS to the main base station BS0.

The positioning request received by the main base station BS0 is transmitted to the computer device LCC via the switching center MSC. When the computer device LCC receives the positioning request,
After performing the necessary preparation for the positioning calculation of the designated mobile station MS, the mobile station MS transmits a positioning permission to the base stations BS0, BS1, and BS2 specified by the BS address included in the positioning request. Information indicating this positioning permission includes each base station BS0, B
S1, BS address specifying BS2, MS address specifying mobile station MS, and base stations BS0, BS1,.
Timing information for adjusting the clock inside BS2 is included. Each of the base stations BS0, BS1, and BS2 that have received the timing information included in the positioning permission synchronizes the processing related to the positioning thereafter.

In this state, thereafter, the main base station BS0 transmits a positioning signal to the mobile station MS at every predetermined period Δt. This positioning signal includes information on the transmission time T. The mobile station MS that has received the positioning signal, after a predetermined time Δt0 after receiving the positioning signal, transmits to each base station BS.
0, BS1, and BS2. The predetermined time Δt0 is a time that is known in the computer device LCC. When the control device 220 of each of the base stations BS0, BS1, and BS2 receives a positioning signal from the mobile device MS, the reception times T0 _Total , T1 _Total , and T2 _{The total} and the reception level of the positioning signal are measured. Then, the transmission device 203 of the main base station BS transfers the time information indicating the transmission time T and the reception time T0 _Total and the information indicating the reception level to the computer device LCC.
The transmission devices 203 of the other base stations BS1 and BS2 are:
The time information indicating the reception times T1 _Total and T2 _Total and the information indicating the reception level are transferred to the computer LCC.

The computer device LCC receives the transmission time T and the reception time T0 _Total provided from the main base station BS0, the reception time T1 _Total provided from the other base stations BS1 and BS2,
T2 _{the To tal,} and based on the predetermined time [Delta] t0 (known), calculates the transmission delay time t0, t1, t2 between the mobile station MS and the base stations BS0, BS1, BS2. The transmission delay times t1, t2, and t3 are calculated according to the following equations.

T0 _Total = t0 + T + Δt0 + t0 = 2
t0 + T + Δt0 T1 _Total = t0 + T + Δt0 + t1 T2 _Total = t0 + T + Δt0 + t2 Thus, the mobile station MS and each of the base stations BS0, BS2, BS
When the transmission delay times t0, t1, and t2 between the mobile station MS and the base stations BS0, BS1, and BS2 are calculated using the transmission delay times t0, t1, and t2. Distance data d0, d1, and d2 are calculated. As described above, since the positioning signal is transmitted from the main base station BS0 to the mobile station MS at a period of Δt, the computer apparatus LCC
Calculates the distance data d0, d1, and d2 for each cycle Δt.

The processing for obtaining the distance data d0, d1, d2 is performed by the mobile station MS and each base station BS0,
BS1 and BS2 are performed asynchronously. When the mobile station MS is synchronized with each of the base stations BS0, BS1, and BS2, the mobile station MS adds a transmission time and transmits a positioning signal to each of the base stations BS0, BS1, and BS2. When,
The distance data d0, d1, and d2 can be calculated based on the reception time at each of the base stations BS0, BS1, and BS2.

As described above, the mobile station MS and each base station B
Computer device LCC for calculating distance data d0, d1, d2 representing distances between S0, BS1, and BS2, respectively.
Further includes a correction calculation function for correcting the distance data;
It has a position calculation function for calculating the position of the mobile device MS from the corrected distance data. The correction calculation function and the position calculation function of the computer device LCC include, for example, distance data correction circuits 401a, 401b, and 401 as shown in FIG.
c and the position calculation circuit 402.

The mobile station MS and each base station BS0, BS1, B
The distance data d0, d1, and d2 obtained by transmitting and receiving the positioning signal to and from S2 are supplied to the distance data correction circuits 401a, 401b, and 401c at predetermined intervals Δt, respectively. Each distance data correction circuit 401a, 401
b, timing t obtained as a result of the correction processing in 401c
Distance data d0 (t) ^* , d1 (t) ^* , d2
(T) ^* is supplied to the position calculation circuit 402. The position calculation circuit 402 transmits the information from the mobile station MS to each of the base stations BS0 and BS0.
1, distance data d0 representing the distance to BS2
(T) ^* , d1 (t) ^* , d2 (t) ^* , and each base station B
Based on the absolute position information of S0, BS1, and BS2, the range of the position where the mobile station MS can exist at the timing t is specified.

Each of the distance data correction circuits 401a, 40
1b and 401c are configured, for example, as shown in FIG.

In FIG. 5, seven-stage flip-flops (FF) 411 (0), 411 (1),... 411 (6)
Are connected in series to form a shift register. The first-stage flip-flop (FF) 411 (0) has the distance data dj (j calculated at every predetermined period Δt as described above.
= 0, 1, 2), and the distance data dj is shifted at the predetermined period Δt.

Each of the flip-flops 411 (0) to 411 (0) to 4
The distance data dj (t) at each timing t set to 11 (6) is supplied to the average speed calculation circuit 412. The average speed calculation circuit 412 is set in the flip-flops 411 (0) to 411 (6) on the assumption that the mobile device MS can be regarded as moving at a constant speed in a fixed direction in a relatively short time. The average speed μ (T) ^* at the timing t = T in the direction of the base station BSj of the mobile station MS is calculated based on the speed data dj (t) (t = T−n to T + n) (n = 3). .

Specifically,

[0065]

(Equation 1) The average speed μ (T) ^* is calculated according to In the case of this example, in the above equation, m = n = 3, where m and n are
The adjustment can be made according to the moving state of the mobile station MS.

The average speed μ (T) calculated as described above
^{* Indicates the} mobile station MS and base station B obtained at every predetermined period Δt
The distance dj (t) from Sj is the timing t = T−3.
For example, when the distance between the distances dj (T + i + 1) and dj (T + i) is averaged by the square of the time Δt, the distance between the distances dj (T + i + 1) and dj (T + i) is changed as shown in FIG. Represents the average speed when traveling at.

The average speed data μ (T) ^* output from the average speed calculation circuit 412 is applied to the constant multiplication circuit 41 in parallel.
3 (0), 413 (1), 413 (2), 413
(4) Input to 413 (5) and 413 (6). The constant multiplication circuit 413 (0) receives the input average speed μ (T) ^*.
Is multiplied by a constant (−3Δt), and μ (T) ^* × (−3Δt)
Is output. This output value μ (T) ^* × (−3Δt) is
Timing three times after timing t = T (t = T + 3)
The estimated value of the distance that the mobile station MS moves in the direction of the base station BSj between (after the time 3Δt) and the timing t = T.

The constant multiplication circuit 413 (1) multiplies the input average speed μ (T) ^* by a constant (−2Δt) to obtain μ (T).
^* × (−2Δt) is output. This output value μ (T) ^* ×
(−2Δt) includes the timing (t = T + 2) (after time 2Δt) two times after the timing t = T and the timing t = T
Is an estimated value of the distance that the mobile station MS moves in the direction of the base station BSj. Similarly, a constant multiplication circuit 413
(2) the average velocity mu ^{(T) *} the constant input (- [delta
t), and μ (T) ^* × (−Δ) is calculated at timing t = T
Is output as an estimated value of the distance that the mobile station MS moves in the direction of the base station BSj between the timing (t = T + 1) (after the time Δt) after the first time and the timing t = T.

The constant multiplication circuit 413 (4) multiplies the input average speed μ (T) ^* by a constant (Δt) to obtain μ (T) ^** ×
(Δt) is changed to the timing (t
= T−1) (before the time Δt) and the timing t = T, and outputs the estimated value of the distance that the mobile station MS moves in the direction of the base station BSj. Similarly, the constant multiplication circuit 41
3 (5) is a constant (2Δ) for the input average speed μ (T) ^*.
t) multiplied by μ (T) ^* × (2Δt) at timing t = T
(T = T−2) (time 2Δt before)
Is output as an estimated value of the distance that the mobile station MS moves in the direction of the base station BSj between the time t and the timing t = T. Further, the constant multiplication circuit 413 (6) multiplies the input average speed μ (T) ^* by a constant (3Δt) to obtain μ (T) ^** ×
(3Δt) is defined as the timing (t = T−3) three times before the timing t = T (before the time 3Δt) and the timing t = T
Is output as an estimated value of the distance that the mobile station MS moves in the direction of the base station BSj.

Further, between the timing (t = T + 3) output from the constant multiplication circuit 413 (0) and the timing t = T, the estimated value μ (T) of the distance that the mobile station MS moves toward the base station BSj. ^* × (−3Δt) and the timing t = T + set in the flip-flop 411 (0)
3 and the calculated distance data dj (T + 3).
4 (0) is added. The added value dj (T + 3) + μ (T) ^* × (−) output from the adding circuit 414 (0).
3Δt) is an estimated value obtained by estimating distance data at timing t = T from calculated distance data dj (T + 3) at timing (t = T + 3).

Hereinafter, similarly, the constant multiplication circuit 413 (1)
From the calculated value μ (T) ^* × (−2Δt) and the calculated distance data dj set in the flip-flop 411 (1).
(T + 2) is added by the addition circuit 414 (1), and the calculated distance data dj (T + T) at the timing (t = T + 2) is added.
The estimated value dj (T + 2) + μ (T) ^* × (−2Δt) obtained by estimating the distance data at timing t = T from 2) is output from the addition circuit 414 (1), and the constant multiplication circuit 41
The operation value μ (T) ^* × (−Δt) from 3 (2) and the operation distance data dj (T + 1) set in the flip-flop 411 (2) are added by the addition circuit 414 (2). Calculation distance data dj at timing (t = T + 1)
The estimated value dj (T + 1) + μ (T) ^* × (−Δ) obtained by estimating the distance data at timing t = T from (T + 1)
t) is output from the adding circuit 414 (2).

The operation value μ (T) ^* × (Δt) from the constant multiplication circuit 413 (4) and the flip-flop 411
The calculated distance data dj (T-1) set in (4) is added by the adding circuit 414 (4), and the timing (t)
= T-1), the estimated value dj obtained by estimating the distance data at the timing t = T from the calculated distance data dj (T-1).
(T-1) + μ (T) ^* × (Δt) is an addition circuit 414
Output from (4), and a constant multiplication circuit 413 (5)
From the calculated value μ (T) ^* × (2Δt) and the calculated distance data dj set in the flip-flop 411 (5).
(T−2) is added by the adding circuit 414 (5), and the calculated distance data dj (T−T) at the timing (t = T−2) is added.
The estimated value dj (T−2) + μ (T) ^* × (2Δt) obtained by estimating the distance data at timing t = T from 2) is output from the adding circuit 414 (5). Further, the operation value μ (T) ^* × (3Δt) from the constant multiplication circuit 413 (6)
And the calculated distance data dj (T-3) set in the flip-flop 411 (6) are added by the adding circuit 414 (6), and the timing t is calculated from the calculated distance data at the timing (t = T-3). The estimated value dj (T−3) + μ (T) ^* × (3ΔT) obtained by estimating the distance data at = T is output from the adding circuit 314 (6).

Each of the above adders 414 (0) to 414
Timin from (2) and 414 (4) -414 (6)
Estimates of distance data and flip-flops at t = T
Calculation distance data dj set in rop 411 (3)
(T) is input to the minimum value detection circuit 415. Minimum value detection
The circuit 415 calculates the distance at the input timing t = T.
Each estimated value of data (dj (T−i) + iμ (T)^*× Δ
t) (i = -n to + n, excluding 0) (n = 3) and tie
From distance data dj (T) calculated at mining t = T
Select the minimum value and adjust the selected minimum value to the corrected distance.
Separation data dj (T) ^*Output as

That is, the minimum value detection circuit 415

[0075]

(Equation 2) , Distance data dj (T) at timing t = T
Select and output ^* . In the case of this example, in the above equation, m
= N = 3, but m and n can be adjusted according to the moving speed of the mobile device MS.

The distance data dj (T) ^* at the timing t = T output from the minimum value detection circuit 415 is input to the selection circuit 416. In addition, the operation distance data dj (T) set in the flip-flop 411 (3) is input to the selection circuit 416. By a selection signal from a control circuit (not shown) of the computer device LCC,
The selection circuit 416 converts the minimum value detection circuit 415 as the final distance data dj (T) ^* at the timing t = T.
Distance data dj (T) ^* or calculated distance data dj (T) set in flip-flop 411 (3).
Is output.

The selection signal is generated as follows.

When communication is performed between the mobile station MS and each base station BSj, if a radio wave used for the communication includes a direct wave (LOS: see FIG. 11), only a reflected wave is included without a direct wave. (NLOS: see FIG. 12), the reception level is increased by 20 dB to 30 dB or more. Accordingly, as described above, the mobile station MS and each base station B
When transmitting and receiving positioning signals to and from the base station BSj
When the reception level of the signal received at the node rises above a predetermined reference (for example, set at 20 dB to 30 dB), the communication has changed from the communication without the direct wave to the communication with the direct wave. You can see that. in this case,
The distance data calculated in the communication after the change becomes relatively accurate.

For this reason, the control circuit determines that the timing t = T
When the reception level of the signal transmitted from the mobile station MS to the base station BSj rises above the above reference, the distance data dj (T) set in the flip-flop 411 (3) is selected. In other cases, , A selection signal for selecting the distance data dj (T) ^* output from the minimum value detection circuit 415.

Each of the distance data correction circuits 401a, 401b, and 401c having the above configuration outputs the distance data dj (T) ^* at each timing t = T as shown in FIGS. 7 and 8, for example. I do.

In FIG. 7, mobile station MS is connected to base station BSj.
In the direction of the characteristic Q, at which time the mobile station MS
Distance data dj calculated based on the transmission timing of the positioning signal from the base station and the reception timing at the base station BSj
(T) is represented by a cross. In the communication between the mobile station MS and the base station BSj, if radio waves including direct waves are rarely used, the calculated distance data d
Many of j (t) are larger than the actual distance represented by the characteristic Q.

In such a situation, the timing t = T = 0
Now, the distance data correction circuit 401a (401
b, 401c).
(0), 411 (1), 411 (2), and 411 (3) have distance data dj (T +
3), dj (T + 2), dj (T + 1), dj (T =
When 0) is set, the minimum distance data selected by the minimum value detection circuit 415 is used as the distance data dj (T = 0) ^* used to specify the position of the mobile station MS. 401a (401b, 401c)
Output from This distance data correction circuit 401a (4
01b, 401c) and distance data dj (T
= 0) ^* is indicated by a circle in FIG.

In this case, even if the distance data dj (T = 0) actually calculated at the timing t = T = 0 becomes larger than the actual distance (see the mark x), the timing t = T +
3, T + 2, and T + 1, the distance data dj (T
+3), dj (T + 2), and estimated distance data at timing t = T = 0 estimated from dj (T + 1) (output values from the respective adders 414 (0), 414 (1), and 414 (2)). ) And distance data dj (T = 0) calculated at timing t = T, the minimum value is selected as distance data dj (T = 0) ^* used for specifying the position of mobile station MS. , The selected distance data dj
(T = 0) ^* (see the mark ○) is a value closer to the actual distance (see the characteristic Q).

At timing t = T = 1, flip-flop
411 (0), 411 (1), 411 (2), 411
(3) The distance calculated at each timing is shown in 411 (4).
Separation data dj (T + 3), dj (T + 2), dj (T +
1) When dj (T) and dj (T-1) are set
, The minimum distance data selected by the minimum detection circuit 415.
Distance that the data is used to determine the position of the mobile station MS
Data dj (T = 1) ^*As the distance data correction circuit 40
1a (401b, 401c). in this case
Also, the distance data correction circuit 401a (401b, 401
Distance data dj output from c) (T = 1)^*(○
Mark) indicates distance data calculated at timing t = T = 1.
Dj (T = 1) (marked by x), the actual distance (characteristic Q)
Represents a distance close to.

Further, at timing t = T = 2, the reception level of the positioning signal transmitted from the mobile station MS at the base station BSj rises by more than a reference (for example, 5 dB to 8 dB).
In this case, the selection signal causes the selection circuit 416 to calculate the operation distance data d set in the flip-flop 411 (3).
j (T = 2). As a result, regardless of each of the estimated distance data, the timing t = T = 2
The distance data dj (T = 2) (marked by x) calculated by the distance data correction circuit 401a (401b, 401) is used as the distance data used to specify the position of the mobile station MS.
c). In this case, timing t = T = 2
The distance data dj (T = 2) obtained at
Communication between the mobile station and the base station BSj is performed by radio waves including direct waves, and the distance represented by the distance data dj (T = 2) is closer to the actual distance.

At timings after timing t = T = 3, all flip-flops 411 (0) to 411
Distance data dj at each timing set in (6)
Based on (T-3) to dj (T + 3), the timing t =
The distance data dj (T) ^* used for specifying the position of the mobile station MS at T is obtained. As described above, the distance data dj (T) ^* used for specifying the position of the mobile device MS based on more calculated distance data ^.
Is obtained, the distance data dj (T) ^* represents a distance closer to the actual distance.

When obtaining the corrected distance data dj (T) ^* at the timing t = T, the timing t = T
The corrected distance data dj (T-1) ^* , dj (T-T) at timings t = T-1, T-2, and T-3 before T.
2) ^* , dj (T-3) ^* have already been obtained. These corrected distance data are obtained by calculating the distance data dj (T-1), dj (T (
-2) and dj (T-3) indicate a distance closer to the actual distance. Therefore, the distance data dj (T-1), dj (T-2), dj (T-
Instead of 3), the corrected distance data dj (T-1) ^* , dj (T-2) ^* , dj (T-3) already obtained.
By using ^* , the distance data dj (T) ^{* at} the timing t = T becomes more accurate.

In order to realize such processing, as shown in FIG.
= Distance data dj (T) ^* corrected at time T = distance data dj (T-1) calculated at timing t = T-1
Is fed back to the flip-flop 411 (4) to be set via the switch 417 (controlled to the position shown by the broken line). With this configuration, the timings T-1, T-2, and T-3 before the timing T are provided.
Flip-flops 411 (4), 411 corresponding to
In (5), 411 (6), more accurate distance data already used for specifying the position of the mobile device MS is set. As a result, more accurate distance data dj (T) ^* at the timing t = T can be obtained.

As described above, each distance data correction circuit 4
The distance data dj (T) ^* to be used for specifying the position of the mobile station MS at each timing output from the 01a, 401b, 401c at every predetermined period Δt is provided to the position calculation circuit 402.

The position calculation circuit 402 receives signals from the distance data correction circuits 401a, 401b, and 401c at the timing t = T from the mobile station MS to the base stations BS0, BS0,
Distance data d0 (T) representing the distance to BS1 and BS2
^* , D1 (T) ^* , d2 (T) ^* and each base station BS0,
Based on the absolute position information of BS1 and BS2, position data for specifying the position of the mobile station MS at the timing t = T is generated. This position data represents, for example, as shown in FIG. 9, a range of positions where the mobile station MS can be located specified by distances from the respective base stations BS0, BS1, and BS2.

The mobile station MS and each base station BS0, BS, BS
2, distance data d0 (t), d1 (t) calculated based on the transmission / reception timing of a positioning signal communicated with
The range of the position where the mobile device MS can be located specified by d2 (t) is, for example, a region A in FIG. On the other hand, as described above, the distance data correction circuits 401a, 401
1b, distance data d0 output from 401c
(T) ^* , d1 (t) ^* , d2 (t) ^* are the corresponding distance data d0 (t), d1 calculated as described above.
(T) and d2 (t) do not become larger. Therefore, the range of the position where the mobile station MS can exist is determined by the corrected distance data d0 (t) ^* , d1 (t) ^* , d2.
(T) Specified in a more narrowed area B represented by ^* .

Since the range of the position where the mobile station MS can exist is specified in the area narrowed down as in the area B, the position of the mobile station MS can be known more accurately.

When the area representing the range of the position where the mobile station MS can exist is specified as described above, it is generally considered that the center of the area is set as the position where the mobile station MS exists. . However, the mobile station MS and each base station BS0, BS
1. The distance between the mobile station and the mobile station is different.
The state of reflection of radio waves transmitted and received in communications between the base station and each of the base stations BS0, BS1, and BS2 is also different. For this reason, the center of the area does not always specify the position of the mobile device MS accurately.

Therefore, the mobile station MS and each base station BS0, B
Distance data d0 between the mobile station MS and each of the base stations BS0, BS1, BS2 calculated based on the transmission / reception timing of the positioning signal transmitted / received between S1 and BS2.
Assuming that (t), d1 (t), and d (2) represent distances larger than the actual distance, distance data representing the distance between the mobile station MS and each of the base stations BS0, BS1, and BS2. Are reduced with the same ratio, the range in which the mobile station MS should be located can be narrowed down more accurately.

In this case, the position calculation circuit 402 performs the following calculation.

Dj (T) ^* using distance data dj (T) ^* indicating the distance between mobile station MS and each base station BSj (j = 0, 1, 2) obtained as described above ^{. *} = Dj (T) ^* × (1-ej)

In the above equation, ej is a calibration error,
Reception level (reduce ej if reception level is high),
It is determined based on the number of repetitive operations, the error range of the distance data to be obtained, and the like. This calibration error ej is set to an appropriate value in the range of 0.001 to 0.1, for example.

According to the calculation according to the above equation, new distance data dj (T) ^** obtained by reducing each distance data dj (T) ^* by the ratio (1-ej) is obtained. In the calculation according to the above expression, the position of the mobile device MS specified by each distance data obtained by the calculation is specified within a predetermined error range (for example, within an area of 5 meters square). And so on.

When i repetitive operations are performed, the mobile station MS
Corrected distance d representing the distance between the base station and each base station BSj
j (T)^**Is dj (T)^**= Dj (T)^*× (1-ej)ⁱ  become. Each distance data dj obtained by this repetitive operation
(T)^**Is the distance data dj obtained as described above.
(T)^*Is the ratio (1-ej)ⁱAnd reduced
Become.

The mobile station MS obtained by the above calculation
Data d0 (T) ^** , d1 (T) ^** , d2 representing the distances between the data and the respective base stations BS0, BS1, BS2.
(T) ^{* *} Thus, the scope of that can exist location of the mobile station MS, for example, as a region C shown in FIG. 10, it is possible to further narrow down. Therefore, the position of the mobile device MS can be specified more accurately.

In the above example, the positioning signal is transmitted from the mobile station MS to each of the base stations BS0, BS1, and BS2 (Up-link method). However, the present invention is not limited to this, and each base station BS0, BS1, Mobile station MS receives positioning signals from BS1 and BS2
, And the mobile station MS can calculate the position based on the transmission / reception timing of each signal.
wn-link method).

In the above example, the average speed calculation circuit 412 and the constant multiplication circuits 413 (0) to 413 shown in FIG.
(2), 413 (4) to 413 (6), adder circuit 414
(0) to 414 (2), 414 (4) to 414 (6) correspond to distance estimating means (average speed calculating means, estimated distance data calculating means), and the minimum value detecting circuit 415 corresponds to distance data determining means (minimum). The position calculation circuit 402 shown in FIG. 4 corresponds to the mobile station position specifying means.
Further, the selection circuit 416 shown in FIG. 5 corresponds to a distance data changing unit.

[0103]

As described above, according to the first to eighth aspects of the present invention, the distance data based on the reception state of the predetermined signal obtained at the predetermined timing and the other plural distance data are obtained. Since the minimum distance data is determined as the distance data to be obtained at the predetermined timing from the distance data based on the reception state of the predetermined signal obtained at the timing of, it is possible to obtain more reliable distance data. it can.

According to the present invention described in claims 8 to 14 and claims 17 to 22, as described above, more reliable distance data between the base station and the mobile station can be obtained. Even if the communication state between the mobile station and each base station changes, the position of the mobile device can be specified as accurately as possible from the distance data.

Further, according to the present invention described in claims 15, 16, 23, and 24, the present invention is obtained when direct waves are not included in radio waves used for communication between a mobile station and each base station. Utilizing the property that an error in the distance data appears in a direction larger than the distance between the mobile device and each base station, each distance data representing the distance between the mobile device and each base station is used as the distance data. Is reduced at a predetermined ratio so that the position of the mobile device is specified within a predetermined error range, the position of the mobile device can be specified more accurately by the reduced distance data.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a basic configuration of a mobile communication system to which a position measuring method of a mobile device according to an embodiment of the present invention is applied.

FIG. 2 is a block diagram illustrating a configuration example of a mobile device.

FIG. 3 is a block diagram illustrating a configuration example of a base station.

FIG. 4 is a block diagram showing an example of a circuit configuration for realizing a distance data correction function and a mobile device position calculation function in the computer device.

FIG. 5 is a block diagram illustrating a configuration example of each distance data correction circuit illustrated in FIG. 4;

FIG. 6 is a diagram illustrating a relationship between movement of a mobile station with respect to a base station and a distance between the mobile station and the base station detected at that time.

FIG. 7 is a diagram illustrating an example of a relationship between calculated distance data and corrected distance data.

FIG. 8 is a diagram illustrating an example of a relationship between calculated distance data and corrected distance data.

FIG. 9 is a diagram showing an example of a range in which a mobile device can exist.

FIG. 10 is a diagram showing an example of a range in which a mobile device can exist.

FIG. 11 is a diagram illustrating an example in which a radio wave used for communication between a mobile device and a base station includes a direct wave and a reflected wave.

FIG. 12 is a diagram illustrating an example in which radio waves used for communication between a mobile station and a base station include only reflected waves.

[Explanation of symbols]

Reference Signs List 50 terminal device 100 mobile station (MS) 200 base station (BS0, BS1, BS2) 300 switching station (MSC) 400 computer unit (LCC) 401a, 401b, 401c distance data correction circuit 402 position calculation circuit 411 (0) to 411 (6) Flip-flop 412 Average speed calculation circuit 413 (0) to 413 (2), 413 (4) to 413
(6) Constant multiplication circuits 414 (0) to 414 (2), 414 (4) to 414
(6) Addition circuit 415 Minimum value detection circuit 416 Selection circuit 417 Switch 500 Network

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5J062 AA08 BB05 CC18 5K067 BB36 DD44 EE02 EE10 EE16 EE24 HH21 JJ51 JJ54

Claims (24)

[Claims] A mobile station transmits and receives a predetermined signal between a base station and a mobile station in a mobile communication system. The base station and the mobile station communicate with each other based on a reception state of the predetermined signal at the base station or the mobile station. A distance measurement method in a mobile communication system that calculates distance data between the base station and the mobile station, based on a reception state of the predetermined signal obtained at a plurality of timings in communication between the base station and the mobile device. The distance data to be obtained at a predetermined timing is estimated from the distance data, and the distance data based on the reception state of the predetermined signal obtained at the predetermined timing and the distance data to be obtained at the predetermined timing are estimated. Distance measurement in a mobile communication system in which the minimum distance data is selected from the measured distance data and the distance data at the predetermined timing is determined. Law. 2. The distance measuring method according to claim 1, wherein an average speed of the mobile station in the direction of the base station is calculated based on distance data based on a reception state of the predetermined signal obtained at a plurality of timings. The distance data based on the reception state of the predetermined signal obtained at each of the plurality of timings, the time between the timing corresponding to the obtained distance data and the predetermined timing, and the Based on the average speed
A distance measuring method in a mobile communication system configured to estimate distance data to be obtained at the predetermined timing. 3. The distance measuring method according to claim 1, wherein when the reception quality of the predetermined signal obtained at the predetermined timing is improved by a predetermined reference level or more, the signal is obtained at the predetermined timing. A distance measurement method for a mobile communication system, wherein the distance data based on the reception state of the predetermined signal is determined as the distance data at the predetermined timing. 4. The distance measuring method according to claim 1, wherein when estimating distance data to be obtained at the predetermined timing, the distance data is obtained at a timing earlier than the predetermined timing among the plurality of timings. A distance measuring method in a mobile communication system, wherein distance data determined at a timing before the predetermined timing is used instead of the obtained distance data based on the reception state of the predetermined signal. 5. A base station and a mobile station transmit and receive a predetermined signal between a base station and a mobile station in a mobile communication system, and transmit the predetermined signal to the base station or the mobile station based on a reception state of the base station or the mobile station. In a distance measurement system in a mobile communication system configured to calculate distance data between, based on the reception state of the predetermined signal obtained at a plurality of timings in communication between the base station and the mobile device Distance estimating means for estimating distance data to be obtained at a predetermined timing from the distance data; distance data based on a reception state of the predetermined signal obtained at the predetermined timing; and a distance to be obtained at the predetermined timing Distance data for determining the minimum distance data from the distance data estimated by the distance estimating means as the distance data at the predetermined timing. Distance measuring system in a mobile communication system having a data determination means. 6. The distance measuring system according to claim 5, wherein said distance estimating means is configured to direct a mobile station to a base station based on distance data obtained at a plurality of timings based on a reception state of the predetermined signal. Average speed calculating means for calculating an average speed in the distance, distance data based on the reception state of the predetermined signal obtained at each of the plurality of timings, timing corresponding to the obtained distance data, and the predetermined An estimated distance data calculating means for estimating distance data to be obtained at the predetermined timing based on a time between the timing and the average speed of the mobile device calculated by the average speed calculating means. A distance measuring system in a communication system. 7. The distance measuring system according to claim 5, wherein said distance data determining means is adapted to improve a reception quality of said predetermined signal obtained at said predetermined timing by a predetermined reference or more. A distance measurement system in a mobile communication system, wherein distance data based on a reception state of the predetermined signal obtained at the predetermined timing is determined as distance data at the predetermined timing. 8. The distance measuring system according to claim 5, wherein the distance estimating means estimates the distance data to be obtained at the predetermined timing, and sets the predetermined timing among the plurality of timings. Instead of the distance data based on the reception state of the predetermined signal obtained at the earlier timing, in a mobile communication system that uses the already determined distance data at the timing before the predetermined timing. Distance measurement system. 9. A mobile station in a mobile communication system transmits and receives a predetermined signal between each of a plurality of base stations and obtains the predetermined signal based on a reception state of each base station or the mobile station. In a method of measuring the position of a mobile station in a mobile communication system in which the position of the mobile station is specified based on the distance data obtained, The distance data to be obtained at a predetermined timing is estimated from each of the distance data based on the reception state of the predetermined signal, and the distance data based on the reception state of the predetermined signal obtained at the predetermined timing and the predetermined distance data The minimum distance data is selected from the distance data estimated as the distance data to be obtained at the timing, and the distance data at the predetermined timing is determined. And, the position measurement method of a mobile station in a mobile communication system adapted to identify the location of a mobile terminal in the predetermined timing based on the distance data said determined. 10. A position measuring method in a mobile communication system according to claim 9, wherein the average of the mobile station in the direction of the base station is calculated based on distance data based on a reception state of the predetermined signal obtained at a plurality of timings. Distance data based on the reception state of the predetermined signal obtained at each of the plurality of timings, the time between the timing corresponding to the obtained distance data and the predetermined timing, and Based on the average speed of the mobile device,
A method for measuring the position of a mobile station in a mobile communication system in which distance data to be obtained at the predetermined timing is estimated. 11. The method for measuring the position of a mobile station according to claim 9, wherein the determination is made when the reception quality of the predetermined signal obtained at the predetermined timing is improved by a predetermined reference or more. In the mobile communication system, the distance data based on the reception state of the predetermined signal obtained at the predetermined timing is used to specify the position of the mobile device at the predetermined timing, instead of the distance data. Machine position measurement method. 12. The method for measuring the position of a mobile station in a mobile communication system according to claim 9, wherein when estimating distance data to be obtained at said predetermined timing, said predetermined timing out of said plurality of timings is used. Instead of the distance data based on the reception state of the predetermined signal obtained at the timing before the timing, the distance data used to specify the position of the mobile device at the timing before the predetermined timing is already used. A method for measuring the position of a mobile station in a mobile communication system using the obtained distance data. 13. A method for measuring the position of a mobile station in a mobile communication system according to claim 9, wherein the mobile station communicates with the plurality of base stations to specify the position of the mobile station. Mobile device in a mobile communication system in which each of a plurality of distance data obtained as distance data used in the mobile communication system is reduced at a predetermined ratio so that the position of the mobile device is specified within a predetermined error range. Position measurement method. 14. The method for measuring the position of a mobile station in a mobile communication system according to claim 13, wherein the operation of reducing each of the plurality of distance data at a predetermined ratio is performed so that the position of the mobile station is within a predetermined error range. And a method for measuring the position of a mobile station in a mobile communication system that is repeatedly performed as specified by the method. 15. A predetermined signal is transmitted and received between a mobile station and each of a plurality of base stations in a mobile communication system, and the predetermined signal is obtained based on a reception state of each base station or the mobile station. In a mobile communication system position measurement method in a mobile communication system in which a position of a mobile device is specified based on distance data indicating a distance between the mobile device and each base station, the position of the mobile device is determined based on a reception state of the predetermined signal. Mobile communication, wherein distance data representing the distance between the mobile device and each base station obtained by the above-described method is reduced at a predetermined ratio so that the position of the mobile device is specified within a predetermined error range. A method for measuring the position of a mobile device in a system. 16. The mobile station position measuring method according to claim 15, wherein the operation of reducing the distance data representing the distance between the mobile station and each base station at a predetermined ratio is performed by the mobile station. A position measuring method for a mobile station in a mobile communication system, wherein the position is determined within a predetermined error range. 17. A mobile station in a mobile communication system, wherein a predetermined signal is transmitted and received between a mobile station and each of a plurality of base stations, and the predetermined signal is obtained based on a reception state of each base station or the mobile station. In a mobile station position measurement system in a mobile communication system in which the position of the mobile station is specified based on the distance data obtained, the position obtained at a plurality of timings in the communication between each base station and the mobile station. Distance estimating means for estimating distance data to be obtained at a predetermined timing from each of the distance data based on the reception state of the predetermined signal; and a distance based on the reception state of the predetermined signal obtained at the predetermined timing. The minimum distance data from the distance data estimated by the distance estimating means is used as the data and the distance data to be obtained at the predetermined timing. Movement having distance data determining means for determining distance data at a fixed timing, and mobile device position specifying means for specifying the position of the mobile device at the predetermined timing based on the distance data determined by the distance data determining means A mobile position measurement system in a communication system. 18. A position measuring system for a mobile station in a mobile communication system according to claim 17, wherein said distance estimating means is based on distance data based on a reception state of said predetermined signal obtained at a plurality of timings. Average speed calculating means for calculating an average speed of the mobile device in the direction of the base station, distance data based on the reception state of the predetermined signal obtained at each of the plurality of timings, and the obtained distance data Estimated distance for calculating distance data to be obtained at the predetermined timing based on the time between the timing corresponding to the predetermined timing and the average speed of the mobile device calculated by the average speed calculation means. A position measuring system for a mobile device in a mobile communication system having data calculation means. 19. A position measuring system for a mobile station in a mobile communication system according to claim 17 or 18, wherein said distance data determining means determines that a reception quality of said predetermined signal obtained at said predetermined timing is a predetermined reference. When the distance becomes better, the distance data based on the reception state of the predetermined signal obtained at the predetermined timing and the distance data estimated by the distance estimating means as the distance data to be obtained at the predetermined timing Instead of the distance data determined based on the distance, the distance data based on the reception state of the predetermined signal obtained at the predetermined timing is used to specify the position of the mobile device at the predetermined timing A position measuring system for a mobile station in a mobile communication system having a distance data changing unit determined as data. 20. A position measuring system for a mobile station in a mobile communication system according to claim 17, wherein said distance estimating means estimates said distance data to be obtained at said predetermined timing. In place of the distance data based on the reception state of the predetermined signal obtained at a timing earlier than the predetermined timing among the timings, in order to specify the position of the mobile device at the timing before the predetermined timing, A position measuring system for a mobile station in a mobile communication system, wherein distance data already obtained by the distance data determining means is used as distance data to be used. 21. A position measuring system for a mobile station in a mobile communication system according to claim 17, wherein said mobile station position specifying means performs communication between said mobile station and said plurality of base stations. Calculating means for reducing a plurality of distance data obtained as distance data used for specifying the position of the mobile device by a predetermined ratio so that the position of the mobile device is specified within a predetermined error range; A mobile device position measurement system in a mobile communication system. 22. The system for measuring the position of a mobile station in a mobile communication system according to claim 21, wherein said calculating means performs an operation of reducing said plurality of distance data at a predetermined ratio, and calculates a position of said mobile station at a predetermined position. A position measuring system for a mobile station in a mobile communication system having a repetitive calculating means for performing repetition so as to be specified within an error range. 23. A mobile station in a mobile communication system transmits and receives a predetermined signal between each of a plurality of base stations and obtains the predetermined signal based on a reception state of each base station or the mobile station. In a mobile communication device position measurement system in a mobile communication system in which the position of a mobile device is specified based on distance data indicating a distance between the mobile device and each base station, the position of the mobile device is determined based on a reception state of the predetermined signal. Moving means having calculation means for reducing the distance data representing the distance between the mobile device and each base station obtained by the above-mentioned method at a predetermined ratio so that the position of the mobile device is specified within a predetermined error range. A position measurement system for a mobile device in a communication system. 24. The mobile station position measuring system in a mobile communication system according to claim 23, wherein said calculating means reduces a distance data representing a distance between said mobile station and each base station by a predetermined ratio. The mobile station position measurement system in a mobile communication system having a repetitive calculation means for repeatedly performing the above operation so that the position of the mobile station is specified within a predetermined error range.