JP4619419B2 - Positioning device, communication system, and positioning method - Google Patents

Description

  The present invention relates to a positioning device, a communication system, and a positioning method for positioning a mobile station.

  2. Description of the Related Art Conventionally, a sector positioning method is known as a method for measuring (positioning) a mobile station in a wireless communication environment (referred to as “cell sector positioning” in Patent Document 1). In this sector positioning method, for example, among the plurality of sectors in a cell, the sector having the maximum reception level of the received signal from the mobile station at the time of positioning is specified, and the center position of the sector is estimated as the position of the mobile station. Is done.

Also, a so-called PRACH-PD positioning method is known as a method for specifying a position in a sector. In this PRACH-PD positioning system, there are a system that assumes the outdoors and a system that assumes the indoors. Among these, in the system assuming outdoor, as shown in FIG. 7, the propagation time until the PRACH signal transmitted to the mobile station 71 returns from the mobile station 71 and reaches the base station 70 is measured. Based on the time, the position of the mobile station 71 in the sector is specified. Further, in the system assuming indoors, as shown in FIG. 8, a multi-drop optical transmission apparatus for mobile communication (Multi-drop) connected to the base station 70 and installed indoors in one sector under the base station 70. An optical feeder (hereinafter referred to as “MOF”) 80 is assigned, and the one sector is formed by radio signals transmitted from antenna groups 81 and 82 connected to the MOF 80. Here, the delay lines 83 inserted between the MOF 80 and the antenna group 81 and the delay lines 84 inserted between the MOF 80 and the antenna group 82 have different lengths. A propagation delay (Propagation Delay, hereinafter also referred to as “PD”) is provided between them. In such a configuration, the propagation time until the PRACH signal transmitted from the base station 70 is returned at the mobile station and reaches the base station 70 is measured, the propagation delay is specified based on the propagation time, and the antenna that the mobile station uses It is identified whether it is located near the group (ie, the location of the mobile station within the sector).
JP 2007-322237 A

  However, positioning errors may occur due to the influence of the radio wave environment at the time of positioning. Here, a PRACH-PD positioning method assuming indoors will be described as an example. For example, FIG. 9 shows a plurality of areas (areas divided by combinations of sector IDs and propagation delays) set inside a building. In FIG. 9, Sx-y means an area where the sector ID is x and the propagation delay type is y.

  When the target mobile station is located in the area S6-1 in the building of FIG. 9, due to the indoor structure of the building (for example, the presence of an atrium or a staircase), the position of the mobile station is It may be erroneously determined as the area S4-2 on the upper floor of the area S6-1, or may be erroneously determined as the area S5-1 or S1-2 adjacent to the area S6-1.

  The present invention has been made to solve the above-mentioned problems, and it is intended to appropriately correct a positioning error caused by a propagation error due to an influence of a radio wave environment at the time of positioning, and to improve reliability of a positioning result. Objective.

  The positioning apparatus according to the present invention divides a cell into a plurality of sectors in advance and divides each sector into a plurality of areas in which different propagation delays are provided in advance, so as to correspond to the combination of the sector and the propagation delay. A positioning device that performs positioning of the position of the mobile station by estimating in which area the mobile station is located among a plurality of set areas, wherein the movement is performed for each of the plurality of areas. A propagation error correction information storage unit storing an area that is correct in propagation error correction and a probability that the station is correct when a positioning result that the position of the station is the area is obtained; and The area to be the correct answer corresponding to the positioning results of a plurality of positions and the probability to be the correct answer are read from the propagation error correction information storage unit, and the read area to be the correct answer and Based on the probability of being with the correct answer, a correcting unit for correcting the positioning result, characterized in that it comprises a positioning result output unit for outputting a positioning result after correction.

  Further, the positioning device according to the present invention can be described as follows. That is, the positioning apparatus according to the present invention receives a positioning request including information on a mobile station to be positioned, divides a cell into a plurality of sectors in advance, and each sector is provided in a plurality of areas provided with different propagation delays. Positioning of the position of the mobile station is estimated by estimating in which area the mobile station is located among a plurality of areas set in association with the combination of the sector and the propagation delay. For each of the plurality of areas, the position of the mobile station is the position of the positioning unit that performs positioning, the area where the mobile station is positioned as a positioning result by the positioning unit, and the positioning result storage unit that stores the positioning time. Propagation error correction information storage unit that stores the area that is correct in propagation error correction and the probability of being correct when the positioning result is determined to be an area, and multiple positioning results and positioning The time is read from the positioning result storage unit, the area to be the correct answer corresponding to the multiple positioning results read and the probability of being the correct answer are read from the propagation error correction information storage unit and read. A positioning result correction unit that calculates the reliability related to each of the positioning results based on the correct answer area and the probability of the correct answer, and corrects the positioning results based on the calculated reliability related to each of the positioning results; And a positioning result output unit for outputting the corrected positioning result.

  According to the positioning apparatus according to the present invention as described above, for each of a plurality of areas, when a positioning result indicating that the position of the mobile station is the area is obtained, the “correction” is made in the propagation error correction. “Area” and “Probability to be correct” are stored, and “Area to be correct” and “Probability to be correct” corresponding to multiple positioning results of the position of the mobile station are read out. In order to correct the positioning result based on the “correct area” and “probability to be correct”, the positioning error due to the propagation error due to the influence of the radio wave environment at the time of positioning is corrected appropriately, and the positioning result Reliability can be improved.

  In addition, the positioning result correction unit matches each of the areas included in the plurality of positioning results from the read out area as the correct answer and the probability of the correct answer as the correct answer area. It is desirable that the probability of being the correct answer is specified for each of the plurality of positionings, the product of the specified probability of being the correct answer is obtained, and the obtained product is set as the reliability of the area .

  In addition, the positioning result correction unit has an area where the reliability is maximum, or a relative ratio obtained by dividing the reliability by the sum of the reliability of each area obtained is a predetermined threshold value or more. It is desirable to correct the positioning result by using the area as a correct positioning result.

  By the way, as described above, the present invention can be regarded as “the invention related to the positioning device”, and can also be regarded as “the invention related to the communication system” and “the invention related to the positioning method”, which will be described later. Play.

  A communication system according to the present invention includes at least one mobile station that performs GPS positioning, at least one base station that forms a cell, a base station controller that performs sector positioning, and positioning that performs positioning of the position of the mobile station The positioning device receives a positioning request including information on a mobile station to be positioned, partitions a cell into a plurality of sectors in advance, and each sector has a different propagation delay. Is divided into a plurality of preliminarily provided areas, and among the plurality of areas set in association with the combination of the sector and the propagation delay, the area where the mobile station is located A positioning unit that performs positioning of the position of the mobile station by estimating based on a result of GPS positioning by the base station or a result of sector positioning by the base station controller, and by the positioning unit As a positioning result, a positioning result storage unit that stores an area where the mobile station is located and a positioning time, and a positioning result that the position of the mobile station is the area are obtained for each of the plurality of areas. In this case, the propagation error correction information storage unit that stores the area that is correct in the propagation error correction and the probability that the correct answer is stored, and a plurality of positioning results and positioning times are read from the positioning result storage unit and read. Read out from the propagation error correction information storage unit the area to be the correct answer and the probability to be the correct answer corresponding to a plurality of positioning results that have been issued, and read the area to be the correct answer and the probability to be the correct answer A positioning result correction unit that calculates the reliability related to each of the positioning results based on the position and corrects the positioning results based on the calculated reliability related to each of the positioning results Characterized by and a positioning result output unit for outputting a positioning result after correction.

  In the positioning method according to the present invention, the cell is divided into a plurality of sectors in advance, and each sector is divided into a plurality of areas in which different propagation delays are provided in advance, so as to correspond to the combination of the sector and the propagation delay. A positioning method executed by a positioning device that performs positioning of the position of the mobile station by estimating in which area the mobile station is located among a plurality of set areas, the positioning device From each of the plurality of areas stored in advance by the area that is the correct answer when the positioning result that the position of the mobile station is the area is obtained and the probability that the position is the correct answer, A step of reading the area to be the correct answer corresponding to a plurality of positioning results of the position of the mobile station and the probability to be the correct answer, the read area to be the correct answer and the correct answer Based on the probability of being a, and correcting the positioning result, characterized in that it comprises the steps of: outputting a positioning result after correction.

  In addition, the positioning method according to the present invention can be described as follows. That is, the positioning method according to the present invention is a positioning method executed by a positioning device, a step of receiving a positioning request including information on a mobile station to be positioned, a cell divided into a plurality of sectors in advance and In which area the mobile station is located among a plurality of areas set in association with a combination of the sector and the propagation delay by dividing the sector into a plurality of areas provided with different propagation delays in advance , By measuring the position of the mobile station, storing the area where the mobile station is positioned as a positioning result, and the positioning time in the positioning result storage unit of the positioning device, Area that is stored in advance by the positioning device and that is the correct answer when a positioning result is obtained that the position of the mobile station is the area for each of the plurality of areas And the step of reading out the area to be the correct answer corresponding to a plurality of positioning results stored in the positioning result storage unit and the probability of being the correct answer from the probability to be the correct answer, and the read correct answer A step of calculating the reliability related to each of the positioning results based on the area and the probability of being the correct answer, the step of correcting the positioning results based on the calculated reliability of the positioning results, and And a step of outputting a positioning result.

  Note that, in the step of calculating the reliability, the positioning device determines, for each of the areas included in the plurality of positioning results, that the area is the correct answer from the read area to be the correct answer and the probability of being the correct answer. The probability of being the correct answer when matching the area to be determined is determined for each of the plurality of positionings, the product of the specified plurality of probabilities of being the correct answer is obtained, and the obtained product is determined as the trust of the area Degree is desirable.

  Further, in the step of correcting the positioning result, the positioning device has a predetermined relative ratio obtained by dividing the area having the maximum reliability or the reliability by the sum of the reliability of each area obtained. It is desirable to correct the positioning result by setting an area that is equal to or greater than the threshold value as a correct positioning result.

  According to the present invention, it is possible to appropriately correct a positioning error caused by a propagation error due to the influence of a radio wave environment at the time of positioning, and improve the reliability of the positioning result.

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

[Configuration of communication system]
First, the configuration of the communication system according to the present embodiment will be described. As shown in FIG. 1, the communication system 1 according to the present embodiment includes at least one mobile station 40 that performs positioning based on GPS (Global Positioning System) (hereinafter referred to as “GPS positioning”) and at least one that forms a cell. It includes a base station 30, a base station controller (Radio Network Controller, hereinafter referred to as “RNC”) 20 that performs sector positioning, and a positioning server 10. Here, as the mobile station 40, there are a mobile station B carried by a child and a mobile station A carried by the parent of the child. The positioning server 10 corresponds to the positioning device according to the present invention.

  Each mobile station 40 transmits a positioning request including information on the positioning target mobile station to the positioning server 10 and receives a response (positioning result) from the positioning server 10 by a wireless communication procedure via the base station 30. A positioning request unit 41, a display unit 42 that displays the received positioning results, and a GPS positioning unit 43 that performs positioning of its own mobile station using GPS.

  The RNC 20 includes a sector positioning unit 21 that performs sector positioning. The positioning process in this embodiment will be described later.

  The positioning server 10 is a communication control unit 11 that performs communication (transmission and reception of various types of information) with the RNC 20, a positioning unit 14 that performs positioning of the position of a mobile station that is a positioning target, and a positioning result obtained by the positioning unit 14 Based on the positioning result storage unit 15, an area attribute storage unit 18 that stores a correspondence table between predetermined area names and position coordinates, a propagation error correction information storage unit 16 that will be described later, and propagation error correction information that will be described later. A positioning result correction unit 12 that corrects the positioning result, a positioning result output unit 13 that outputs the corrected positioning result, and a positioning request unit 17 for directly making a positioning request to the positioning unit 14 are provided. Among these, the positioning unit 14 receives a positioning request including information on a positioning target mobile station, and performs positioning of the positioning target mobile station according to a procedure described later.

  From the viewpoint of hardware, the positioning server 10 includes, for example, a CPU 10A that executes an operating system, an application program, etc., a main storage unit 10B composed of ROM and RAM, a non-volatile memory, and the like as shown in FIG. An auxiliary storage unit 10C composed of: a communication control unit 10D that performs data communication; an output unit 10E that displays information, prints out information, and the like; and keys for character / number input and execution instructions And the operation unit 10F. The functions described in FIG. 1 are executed by loading predetermined software onto the CPU 10A and the main storage unit 10B shown in FIG. 2 and executing the software, and the communication control unit 10D is controlled under the control of the CPU 10A. It is realized by operating and reading and writing data in the main storage unit 10B and the auxiliary storage unit 10C. The RNC 20, the base station 30, and the mobile station 40 also have a basic hardware configuration as shown in FIG.

  FIG. 3 shows a correspondence table between area names and position coordinates stored in the area attribute storage unit 18. As shown in FIG. 3, the position coordinates include latitude, longitude, and altitude. In the present embodiment, as shown in FIG. 9, a plurality of areas (areas divided by combinations of sector IDs and propagation delays) set in a certain building are assumed as areas. In FIG. 9, Sx-y means an area where the sector ID is x and the propagation delay type is y.

  In FIG. 4, the example of the positioning result memorize | stored in the positioning result memory | storage part 15 is shown. As shown in FIGS. 4A and 4B, the positioning result storage unit 15 includes identification information (user ID) of a positioning target mobile station and positioning results (specifically, latitude, longitude, altitude). And the positioning time, and if there is an area corresponding to the positioning result, the corresponding area name is stored by the positioning unit 14, and the corrected area name is the positioning result correcting unit as the corrected positioning result. 12 is stored. Here, when there is no area corresponding to the positioning result, the area name column is blank as shown in FIG. 4B, and in this case, the area name as indicated by the arrow X is displayed in the correction area name column. Instead, the positioning result (latitude, longitude, altitude) itself (indicated as “positioning result area” for convenience in FIG. 4B) may be stored. As the mobile station identification information (user ID), the mobile station telephone number may be adopted, or an ID set uniquely may be adopted.

  FIG. 5 shows an example of propagation error correction information stored in the propagation error correction information storage unit 16. As shown in FIG. 5, in the propagation error correction information storage unit 16, for each of a plurality of areas, when a positioning result that the position of the mobile station is the area is obtained, the propagation error correction corrects the correct answer. And the probability of being the correct answer are stored. Here, the “area” includes both an area (for example, S4-2) divided in advance and a position coordinate itself (for example, (N35.66983, E139.74372, 1)). Further, the probability of being correct may be set manually or based on the result of positioning in advance in the target environment. Of these, for the latter, the probability of being the correct answer may be calculated from the correct area for a plurality of positioning results and the rate of occurrence.

  Here, for example, when the area S4-2 is obtained as a positioning result, the probability “90%” that the area S4-2 is correct in the propagation error correction is stored, and the area S6-1 is correct. The probability “10%” is stored. In addition, when position coordinates (N35.66983, E139.74372, *) are obtained as positioning results (that is, position coordinates of latitude 35.66983 degrees north latitude and longitude 139.74372 degrees east longitude are obtained regardless of altitude values). The probability that the position coordinates are correct in the propagation error correction is stored, and the probability “50%” that the area S1-1 is correct is stored.

  Furthermore, “(N35.66983, E139.74372, 1) to (N35.66985, E139.74376, 1)” in the positioning result area column means that the altitude is “1” and the latitude is 35.66983 degrees to 35.66985 It means a two-dimensional region within the range of degrees and whose longitude is within the range of 139.74360 degrees to 139.74372 degrees east longitude. Here, when the position coordinates in the two-dimensional region are obtained as a positioning result, the probability “50%” that the position coordinates of the positioning result itself are correct in the propagation error correction is stored, and the area S1 is stored. The probability “50%” that -1 is correct is stored.

[Processing flow of this embodiment]
Hereinafter, the processing flow executed in the communication system of the present embodiment will be described with reference to the flowchart of FIG. Here, it is assumed in FIG. 1 that the mobile station A carried by the parent requests the positioning server 10 from the mobile station A carried by the parent for the mobile station B carried by the child.

  First, the mobile station A makes a positioning request to the positioning server 10 (step S1 in FIG. 6). Specifically, the positioning request unit 41 of the mobile station A transmits a positioning request including the ID of the positioning target mobile station B input by the user of the mobile station A and the continuous positioning condition to the positioning server 10. Note that the above-mentioned continuous positioning conditions include the number of positioning (finite number of times (for example, 5 times) or infinite designation) and positioning time interval (for example, 1 minute interval, 5 minute interval, etc.).

  Next, in the positioning server 10, when the positioning unit 14 receives a positioning request from the mobile station A via the communication control unit 11 (step S2), the positioning unit 14 cooperates with the RNC 20 and the positioning target mobile station B as follows. Correct positioning is executed (step S3).

  First, the positioning unit 14 transmits a positioning request to the RNC 20. In the RNC 20, the sector positioning unit 21 specifies a positioning target from the “ID of the positioning target mobile station B” included in the positioning request, and determines the number of positioning times and the positioning time interval from the “continuous positioning condition” included in the positioning request. Then, sector positioning is performed at the above-described number of positioning times and positioning time intervals with the mobile station B as a positioning target. Specifically, the sector positioning unit 21 measures the sector to which the mobile station B is connected and the propagation delay value, and based on the sector and the propagation delay value, the sector positioning result (latitude, longitude) of the mobile station B , Get altitude). Further, the sector positioning unit 21 transmits a positioning request for GPS positioning including the continuous positioning condition and the obtained sector positioning result (latitude, longitude, altitude) of the mobile station B to the mobile station B. In the mobile station B that has received the positioning request, if GPS positioning can be executed at that time, the GPS positioning unit 43 executes GPS positioning, and the GPS positioning result (latitude, longitude, altitude) is sent to the sector positioning unit 21. Send back. On the other hand, if GPS positioning cannot be performed at that time, the GPS positioning unit 43 returns the sector positioning result (latitude, longitude, altitude) to the sector positioning unit 21. Then, the sector positioning unit 21 transmits the received positioning result (that is, the GPS positioning result when GPS positioning is feasible, and the sector positioning result when GPS positioning is not feasible) to the positioning unit 14. Thereby, the positioning unit 14 obtains the positioning result (latitude, longitude, altitude) of the mobile station B.

  As for the positioning time interval, positioning may be performed at the positioning time interval specified in the positioning request. However, if it takes time to acquire the positioning result, (after the previous positioning result acquisition) In addition, positioning may be performed when the condition that the positioning time interval elapses from the previous positioning request is satisfied. When the positioning count is set to “infinite”, the positioning is terminated by manually transmitting a positioning stop request from the positioning request unit 41 of the mobile station A.

  After positioning, the positioning unit 14 stores the positioning result (latitude, longitude, altitude) and positioning time in association with the ID of the positioning target mobile station (user ID of mobile station B, “U001” in this case) and the positioning result. It memorize | stores in the part 15 (step S4). At this time, the positioning unit 14 refers to the area attribute storage unit 18 to search for an area corresponding to the position coordinate of the positioning result, and if the corresponding area exists, also stores the area name in the positioning result storage unit 15. .

  Next, the positioning result correction unit 12 reads out a plurality of past positioning results with reference to the positioning result storage unit 15, and “the area to be correct” and “corresponding to the plurality of positioning results read out” and “ The probability of “correct answer” is read from the propagation error correction information storage unit 16 (step S5). At this time, it is set in advance how many seconds are acquired in the past for reading the past positioning results.

  Here, for example, if the past four positioning results S6-1, S4-2, S6-1, and S4-2 shown in FIG. 4A are read out, it corresponds to the positioning result S6-1 (correct answer and Area S6-1, probability of correct answer 90%) and (correct area S2-1, probability of correct answer 10%) are read and correspond to the positioning result S4-2 (correct answer and Area S4-2, probability of correct answer 90%) and (area S6-1 correct answer, probability 10% of correct answer) are read out.

  Then, the positioning result correcting unit 12 determines, for each of the positioning results S6-1 and S4-2, the probability that the positioning result is correct (that is, “when the positioning result matches the“ corrected area ”). "Probability to be correct") is specified for each of a plurality of positionings, a product of a plurality of specified "probability to be correct" is obtained, and the obtained product is calculated as the reliability of the positioning result (step S6). ). For example, when positioning results S6-1, S4-2, S6-1, and S4-2 are read, for the positioning result S6-1, the “probability of being correct” in each of a plurality of positionings is Since 0.9, 0.1, 0.9, and 0.1 are specified, 0.9 × 0.1 × 0.9 × 0.1 = 0.0081 is calculated as the reliability. On the other hand, for the positioning result S4-2, the “probability of being correct” in each of the multiple positionings is specified as 0, 0.9, 0, 0.9, and thus the reliability is 0 × 0.9 × 0 × 0.9 = 0 is calculated.

  Further, the positioning result correction unit 12 specifies S6-1 as an area where the calculated reliability is maximized, and corrects the positioning result using this area S6-1 as a correct positioning result (step S7). Here, among the positioning results S6-1, S4-2, S6-1, and S4-2, S4-2 is corrected to S6-1. Then, the positioning result correction unit 12 stores the corrected positioning result in the positioning result storage unit 15. As a result, as shown in FIG. 4A, the corrected positioning results S6-1, S6-1, S6-1, and S6-1 are stored in the “correction area name” column.

  In addition, as a method for obtaining a correct positioning result from the calculated reliability, in addition to obtaining an area with the maximum reliability, the relative ratio of reliability (that is, the reliability is divided by the sum of the reliability of each area). The area (one or more) in which the relative ratio obtained in this manner is equal to or greater than a predetermined threshold may be used as a correct positioning result.

  After the correction as described above, the positioning result output unit 13 outputs the corrected positioning result (step S8). Specifically, the positioning result output unit 13 transmits the corrected positioning result to the mobile station A (the mobile station that has made the positioning request), and displays it on a display device that constitutes the positioning result output unit 13. . In the mobile station A, when the positioning request unit 41 receives the corrected positioning result, the received positioning result is displayed on the display unit 42 (step S9). The form of the display output may be displayed by characters on the screen, or may be displayed by plotting the correction area on the map displayed on the screen. When displaying in text, when the positioning result is one area, for example, “Positioning target is near area S6-1” is displayed, and when the positioning result is a plurality of areas, for example, “Positioning target is area “It is near the boundary between S6-1 and S1-2”. Thereby, the parent carrying the mobile station A can recognize the position of the mobile station B carried by the child (that is, the position where the child is located).

  According to the above embodiment, the positioning error due to the propagation error due to the influence of the radio wave environment at the time of positioning can be appropriately corrected, and the reliability of the positioning result can be improved.

  In the above-described embodiment, a mode in which a positioning request is made from a mobile station A other than the positioning target mobile station B or the positioning server 10 has been described, but a positioning request may be made from the positioning target mobile station itself. Moreover, you may mount all the functions with which the positioning server 10 is provided in a mobile station. At this time, the mobile station can autonomously perform positioning for itself and correction of the positioning result. In this case, the mobile station corresponds to the positioning device according to the present invention. In addition, by mounting some of the functions of the positioning server 10 in the mobile station, the mobile station cooperates with the positioning server 10 to correct the positioning for the mobile station and correct the positioning result. It can be performed.

It is a block diagram of the communication system concerning embodiment of invention. It is a hardware block diagram of a positioning server. It is a figure which shows the information memorize | stored in the area attribute memory | storage part. It is a figure which shows the example of the positioning result memorize | stored in a positioning result memory | storage part. It is a figure which shows the example of the propagation error correction information memorize | stored in the propagation error correction information storage part. It is a figure which shows the processing flow performed in a communication system. It is a figure for demonstrating a PRACH-PD positioning system. It is a figure which shows the example of indoor application of a PRACH-PD positioning system. It is a figure which shows the area set indoors of a certain building.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Communication system, 10 ... Positioning server, 10A ... CPU, 10B ... Main memory part, 10C ... Auxiliary memory part, 10D ... Communication control part, 10E ... Output part, 10F ... Operation part, 11 ... Communication control part, 12 ... Positioning result correction unit, 13 ... Positioning result output unit, 14 ... Positioning unit, 15 ... Positioning result storage unit, 16 ... Propagation error correction information storage unit, 17 ... Positioning request unit, 18 ... Area attribute storage unit, 20 ... RNC, DESCRIPTION OF SYMBOLS 21 ... Sector positioning part, 30 ... Base station, 40 ... Mobile station, 41 ... Positioning request part, 42 ... Display part, 43 ... GPS positioning part, 70 ... Base station, 71 ... Mobile station, 80 ... MOF, 81, 82 ... antenna group, 83, 84 ... delay line.

Claims (9)

Of the plurality of areas set in association with the combination of the sector and the propagation delay by dividing the cell into a plurality of sectors in advance and dividing each sector into a plurality of areas provided with different propagation delays in advance , A positioning device that measures the position of the mobile station by estimating in which area the mobile station is located,
For each of the plurality of areas, a propagation error storing the area that is correct in propagation error correction and the probability that the mobile station is the correct answer when a positioning result indicating that the position of the mobile station is the area is obtained. A correction information storage unit;
The area to be the correct answer corresponding to the positioning results of the mobile station multiple times and the probability to be the correct answer are read from the propagation error correction information storage unit, and the read correct area and the correct answer are read. A correction unit that corrects the positioning result based on the probability of
A positioning result output unit for outputting the corrected positioning result;
A positioning device comprising: Accepting a positioning request including information on a mobile station to be positioned, dividing a cell into a plurality of sectors in advance and dividing each sector into a plurality of areas with different propagation delays in advance, the sector and the propagation delay A positioning unit that performs positioning of the position of the mobile station by estimating in which area the mobile station is located among a plurality of areas set in association with
An area where the mobile station is located as a positioning result by the positioning unit, and a positioning result storage unit that stores a positioning time;
For each of the plurality of areas, a propagation error storing the area that is correct in propagation error correction and the probability that the mobile station is the correct answer when a positioning result indicating that the position of the mobile station is the area is obtained. A correction information storage unit;
A plurality of positioning results and positioning times are read from the positioning result storage unit, and the area to be the correct answer corresponding to the read positioning results and the probability of the correct answer are stored in the propagation error correction information storage Read from the unit, calculate the reliability for each positioning result based on the read area and the probability of the correct answer, and calculate the positioning result based on the calculated reliability for each positioning result A positioning result correction unit to be corrected;
A positioning result output unit for outputting the corrected positioning result;
A positioning device comprising:   For each of the areas included in the plurality of positioning results, the positioning result correction unit matches the read out area as the correct answer and the probability of the correct answer as the correct answer area. Specifying the probability of being the correct answer for each of the plurality of positionings, obtaining a product of the plurality of specified probabilities of being correct, and setting the obtained product as the reliability of the area, The positioning device according to claim 2.   The positioning result correction unit has an area where the reliability is maximum, or a relative ratio obtained by dividing the reliability by the sum of the reliability of each area obtained is equal to or greater than a predetermined threshold value. 4. The positioning device according to claim 3, wherein the positioning result is corrected using the area as a correct positioning result. At least one mobile station that performs GPS positioning, at least one base station that forms a cell, a base station controller that performs sector positioning, and a positioning device that performs positioning of the position of the mobile station A communication system,
The positioning device is
Accepting a positioning request including information on a mobile station to be positioned, dividing a cell into a plurality of sectors in advance and dividing each sector into a plurality of areas with different propagation delays in advance, the sector and the propagation delay Based on the result of GPS positioning by the mobile station or the result of sector positioning by the base station control device, the mobile station is located in a plurality of areas set in association with the combination of A positioning unit that performs positioning of the position of the mobile station by estimating;
An area where the mobile station is located as a positioning result by the positioning unit, and a positioning result storage unit that stores a positioning time;
For each of the plurality of areas, a propagation error storing the area that is correct in propagation error correction and the probability that the mobile station is the correct answer when a positioning result indicating that the position of the mobile station is the area is obtained. A correction information storage unit;
A plurality of positioning results and positioning times are read from the positioning result storage unit, and the area to be the correct answer corresponding to the read positioning results and the probability of the correct answer are stored in the propagation error correction information storage Read from the unit, calculate the reliability for each positioning result based on the read area and the probability of the correct answer, and calculate the positioning result based on the calculated reliability for each positioning result A positioning result correction unit to be corrected;
A positioning result output unit for outputting the corrected positioning result;
A communication system comprising: Of the plurality of areas set in association with the combination of the sector and the propagation delay by dividing the cell into a plurality of sectors in advance and dividing each sector into a plurality of areas provided with different propagation delays in advance A positioning method performed by a positioning device that measures the position of the mobile station by estimating in which area the mobile station is located,
For each of the plurality of areas stored in advance by the positioning device, the area that is the correct answer when the positioning result that the position of the mobile station is the area is obtained, and the probability that the mobile station is the correct answer From the step of reading the area to be the correct answer corresponding to a plurality of positioning results of the position of the mobile station and the probability to be the correct answer,
Correcting the positioning result based on the read area to be the correct answer and the probability of being the correct answer;
A step of outputting the corrected positioning result;
A positioning method comprising: A positioning method executed by a positioning device,
Receiving a positioning request including information of a mobile station to be positioned;
Of the plurality of areas set in association with the combination of the sector and the propagation delay by dividing the cell into a plurality of sectors in advance and dividing each sector into a plurality of areas provided with different propagation delays in advance Measuring the position of the mobile station by estimating in which area the mobile station is located; and
Storing the area where the mobile station is located as a positioning result and the positioning time in the positioning result storage unit of the positioning device;
For each of the plurality of areas stored in advance by the positioning device, the area that is the correct answer when the positioning result that the position of the mobile station is the area is obtained, and the probability that the mobile station is the correct answer From the step of reading the area to be the correct answer corresponding to the positioning results stored in the positioning result storage unit and the probability of being the correct answer,
Calculating a reliability for each of the positioning results based on the read area and the probability of being the correct answer;
Correcting the positioning result based on the reliability related to each of the calculated positioning results;
A step of outputting the corrected positioning result;
A positioning method comprising:   In the step of calculating the reliability, the positioning device determines, for each of the areas included in the positioning results of the plurality of times, from the read area to be the correct answer and the probability of being the correct answer. The probability of being the correct answer when matching the area to be correct is identified for each of the plurality of positionings, the product of the plurality of identified probabilities of being correct is determined, and the obtained product is calculated for the area. The positioning method according to claim 7, wherein the positioning method is reliability. In the step of correcting the positioning result, the positioning device has an area where the reliability is maximum, or a relative ratio obtained by dividing the reliability by the sum of the reliability of each area obtained. 9. The positioning method according to claim 8, wherein the positioning result is corrected with an area that is equal to or greater than a predetermined threshold as a correct positioning result.

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