JP2011058844A - Position information control system and position information control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a position information control system and a position information control method capable of accurate positioning of a mobile terminal. <P>SOLUTION: A communication system 10 first obtains the terminal position information and the sector information of a mobile machine 100, and determines whether the terminal position information indicates outside of the sector area map S1, which is determined by the sector information. Then, when it is determined that the terminal position information indicates outside of the sector area map S1, the terminal position information is corrected onto the sector area map S1. Thereby, when it is determined that the terminal position information does not exist on the sector area map S1, the terminal position information is corrected onto the sector area map S1, and thus the terminal position information of the mobile machine 100, which should have been on the sector area map S1, can be more properly corrected. As the result, the positioning of the mobile machine 100 can be more accurately performed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a location information management system for managing terminal location information of a mobile terminal, and a location information management method performed by the location information management system.

  Conventionally, the technology for positioning a mobile terminal has been improved. For example, Patent Document 1 below discloses a positioning system that enables accurate positioning of a mobile communication terminal even when a multipath delay occurs in radio waves transmitted or received by the mobile communication terminal. Is disclosed.

JP 2008-267773 A

  In recent years, techniques for estimating the population distribution using the positioning results of mobile terminals such as mobile phones have been studied. In order to accurately estimate the population distribution using the positioning result of the mobile terminal, the position of the mobile terminal needs to be obtained with high accuracy. However, the positioning system described in Patent Document 1 has room for improving the position accuracy of the mobile terminal.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a position information management system and a position information management method capable of obtaining the position of a mobile terminal with higher accuracy.

  That is, the location information management system according to the present invention includes an acquisition unit that acquires terminal location information and sector information of a mobile terminal, and the terminal location information is based on the terminal location information and sector information acquired by the acquisition unit. A determination means for determining whether or not the terminal position information is not within the sector power range, and a determination means for determining whether or not the terminal position information is not within the sector power range; Correction means for correcting the position information.

  The location information management system according to the present invention first acquires terminal location information and sector information of a mobile terminal as a set, and determines whether or not the location information is within a sector influence range determined by the sector information. To do. When it is determined that the terminal position information does not exist within the sector influence range, the terminal position information is corrected within the sector influence range. As described above, when it is determined that the terminal position information does not exist within the sector influence range, the terminal position information is corrected within the sector influence range. The terminal position information can be corrected more appropriately. As a result, it is possible to improve the position accuracy of the mobile terminal.

  The correction means preferably corrects the terminal position information at the intersection of the boundary of the sector influence range and a line connecting the position of the base station and the position indicated by the terminal position information. Thereby, the terminal position information is corrected at a point where a line connecting the position of the base station and the position indicated by the terminal position information intersects the boundary of the sector influence range. For this reason, regarding the terminal position information of the mobile terminal that should originally exist within the sector influence range, the position of the base station and the position indicated by the terminal position information are both taken into account and within the sector influence range. It can be corrected. As a result, it is possible to improve the position accuracy of the mobile terminal.

  Further, the correction means preferably corrects the terminal position information at the intersection point where the circle passing through the position indicated by the terminal position information intersects with the boundary line of the sector power range with the base station managing the sector as the center. . As a result, the terminal position information is corrected to the position of the intersection where the circle passing through the position indicated by the terminal position information and the base line managing the sector intersects the boundary line of the sector power range. For this reason, regarding the terminal position information of a mobile terminal that should originally exist within the sector influence range, the position of the base station and the position indicated by the terminal position information are both taken into consideration and The position can be corrected. As a result, the position of the mobile terminal can be obtained more accurately.

  The correction means preferably corrects the terminal position information at the center position of the sector power range. Thereby, the terminal position information is corrected to the center position of the sector influence range. For this reason, it is possible to correct the terminal position information of the mobile terminal that should originally exist within the sector power range to the center position of the sector power range. As a result, it is possible to improve the position accuracy of the mobile terminal.

  A location information management method according to the present invention is a location information management method performed in a location information management system that manages terminal location information of a mobile terminal, and the location information management system acquires the location information and sector information of the mobile terminal. The location information management system determines whether the terminal location information is within the sector power range determined by the sector information based on the acquisition step and the terminal location information and sector information acquired in the acquisition step. And a correction step in which the position information management system corrects the terminal position information within the sector power range when it is determined that the terminal position information does not exist within the sector power range. It is characterized by that.

  In the position information management method according to the present invention, first, terminal position information and sector information of a mobile terminal are acquired, and it is determined whether or not the terminal position information is within a sector influence range defined by the sector information. . If it is determined that the terminal position information does not exist within the sector influence range, the terminal position information is corrected within the sector influence range. As described above, when it is determined that the terminal position information does not exist within the sector influence range, the terminal position information is corrected within the sector influence range. Therefore, the mobile terminal that should originally exist within the sector influence range. Can be corrected more appropriately. As a result, the position of the mobile terminal can be obtained more accurately.

  According to the present invention, it is possible to provide a position information management system and a position information management method capable of obtaining the position of a mobile terminal with higher accuracy.

It is a schematic block diagram of a communication system. It is a functional block diagram of the main unit of a communication system. It is a physical block diagram of the main unit of a communication system. It is explanatory drawing explaining the 1st example of a sector influence diagram produced | generated, a 2nd example, and a 3rd example. It is explanatory drawing explaining the detail of the 1st example of the correction method of terminal position information. It is explanatory drawing explaining the detail of the 2nd example of the correction method of terminal position information. It is explanatory drawing explaining the detail of the storage format of a sector influence diagram. It is explanatory drawing explaining the detail of the storage format of terminal location information. It is explanatory drawing explaining the detail of the memory | storage format of corrected terminal position information. It is a flowchart explaining the detail of the flow of the positional information management process which a communication system performs. It is explanatory drawing explaining the difference between the conventional process and the process which a communication system performs. It is explanatory drawing explaining the modification of the shape of a sector influence diagram.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

(1) Schematic Configuration of Communication System First, a schematic configuration of a communication system as a location information management system of the present embodiment will be described with reference to FIG. FIG. 1 is a schematic configuration diagram of a communication system 10. The communication system 10 is a system capable of correcting (correcting) position positioning information of a mobile device 100 as a mobile terminal such as a mobile phone using a sector influence diagram described later.

  As shown in FIG. 1, the communication system 10 includes a mobile device 100, a BTS 200 (base station), an RNC 300 (radio control device), an exchange 400, and a management center 500. The management center 500 includes a social sensor unit 501, a petamining unit 502, a mobile demography unit 503, and a visualization solution unit 504.

  The exchange 400 collects terminal location information of the mobile device 100 via the BTS 200 and the RNC 300. The RNC 300 can measure the position of the mobile device 100 when specific communication is performed with the mobile device 100. The exchange 400 can receive the terminal location information of the mobile device 100 thus positioned when the mobile device 100 executes specific communication. The exchange 400 stores the received terminal location information, and outputs the collected terminal location information to the management center 500 at a predetermined timing or in response to a request from the management center 500.

  As described above, the management center 500 includes the social sensor unit 501, the petamining unit 502, the mobile demography unit 503, and the visualization solution unit 504. In each unit, the terminal location information of the mobile device 100 is obtained. Perform the statistical processing used.

  The social sensor unit 501 is a server device that collects data including terminal location information of the mobile device 100 from each exchange 400. The social sensor unit 501 is configured to receive data periodically output from the exchange 400 or to acquire data from the exchange 400 according to a predetermined timing in the social sensor unit 501.

  The petamining unit 502 is a server device that converts data received from the social sensor unit 501 into a predetermined data format. For example, the petamining unit 502 performs a sorting process using a user identifier as a key, or performs a sorting process for each area.

  The mobile demography unit 503 is a server device that performs a tabulation process on the data processed in the petamining unit 502, that is, a house-carring process for each item. For example, the mobile demography unit 503 can count the number of users existing in a certain area, or can total the distribution of the locations.

  The visualization solution unit 504 is a server device that processes the data aggregated in the mobile demography unit 503 so as to be visible. For example, the visualization solution unit 504 can map the aggregated data on a map. It should be noted that the information statistically processed in this way is processed so that individuals are not specified so as not to infringe privacy.

(2) Main Configuration of Communication System Next, configurations of the social sensor unit 501 and the petamining unit 502 as the main unit of the communication system 10 will be described with reference to FIGS. 2 and 3. FIG. 2 is a functional configuration diagram of the main unit 505 of the communication system 10, and FIG. 3 is a physical configuration diagram of the main unit 505 of the communication system 10. As shown in FIG. 3, the main unit 505 communicates with a CPU 101 (Central Processing Unit) as main physical components, a RAM 102 (Random Access Memory) and a ROM 103 (Read Only Memory) as main storage devices. And a communication module 104 and a computer including hardware such as an auxiliary storage device 105 such as a hard disk. The function of the main unit 505 is exhibited by the operation of these components.

  Further, as shown in FIG. 2, the main unit 505 includes, as main functional components, a sector information storage unit 1 (storage unit), a sector influence diagram generation unit 2 (storage unit), and a sector influence diagram storage unit. 3 (storage unit), terminal location information acquisition unit 4 (storage unit), terminal location information storage unit 5 (storage unit), sector / terminal location information combination unit 6 (determination unit), corrected terminal location information generation unit 7 ( And a corrected terminal position information storage unit 8 (correction means).

  The sector information storage unit 1 is a part that acquires and stores parameter information related to each BTS 200. The parameter information stored by the sector information storage unit 1 includes, for example, the latitude and longitude of the center position of the BTS 200, the base station name, the sector identifier, the latitude and longitude of the center position of the sector influence diagram, and horizontal transmission of radio waves. The angle, vertical transmission angle (tilt angle), radio wave transmission power, antenna type, antenna characteristics, minimum radio wave transmission delay (* ms), maximum radio wave transmission delay (* ms), and the like. The parameter information stored in the sector information storage unit 1 is registered and updated by a carrier network administrator.

  The sector influence diagram generation unit 2 is a part that receives parameter information from the sector information storage unit 1 and generates sector influence diagram information based on the parameter information. Sector influence diagram information refers to a set of sector influence ranges managed by each BTS 200 and parameter information corresponding to the sector. For the generation of sector power diagram information, information on the latitude and longitude of the BTS 200, sector identifiers to be described later, horizontal and vertical angles of the sector power diagram, transmission power, antenna installation altitude, and antenna type and antenna characteristics for each sector Is used. The sector influence diagram generating unit 2 can also create a more accurate sector influence diagram based on the radio wave measurement survey result. Details of the sector power diagram generated by the sector power diagram generator 2 will be described later.

  The sector power diagram storage unit 3 is a part that receives and stores the sector power diagram generated by the sector power diagram generation unit 2. Details of the storage format of the sector influence diagram information by the sector influence diagram storage unit 3 will be described later.

  The terminal location information acquisition unit 4 is a set of terminal location information of the mobile device 100 and a sector identifier that uniquely identifies and identifies the sector to which the mobile device 100 belongs, and is acquired from information transmitted from the mobile device 100 It is a part to do.

  The terminal location information storage unit 5 is a part that stores the terminal location information and the sector identifier acquired by the terminal location information acquisition unit 4. Details of the storage format of the terminal location information and the sector identifier by the terminal location information storage unit 5 will be described later.

  The sector / terminal location information combining unit 6 combines the sector influence diagram information stored in the sector influence diagram storage unit 3 and the terminal location information stored in the terminal location information storage unit 5 with information corresponding to each other. This is the part that performs the combining process. Further, the sector / terminal location information combining unit 6 is based on the terminal location information stored in the terminal location information storage unit 5, the sector identifier of the sector to which the sector / terminal location information storage unit 5 belongs, and the sector influence diagram information stored in the sector influence diagram storage unit 3. Thus, it is determined whether or not the terminal position information exists in the sector influence diagram determined by the sector information.

  When the sector / terminal location information combining unit 6 determines that the terminal location information does not exist within the sector influence range, the corrected terminal location information generation unit 7 obtains the terminal location information acquired by the terminal location information acquisition unit 4. This is a part for generating corrected terminal position information by correcting within this sector power range according to a predetermined algorithm. Details of the predetermined algorithm will be described later.

  The corrected terminal position information storage unit 8 is a part that stores the corrected terminal position information generated by the corrected terminal position information generation unit 7. Details of the storage format of the corrected terminal position information by the corrected terminal position information storage unit 8 will be described later.

(3) First example, second example, and third example of sector influence diagram Next, details of the first example, second example, and third example of the sector influence diagram generated by the sector influence diagram generation unit 2 Will be described with reference to FIG. FIG. 4 is an explanatory diagram for explaining a first example, a second example, and a third example of the sector influence diagram generated by the sector influence diagram generation unit 2. That is, the range shown in FIG. 4A is a first example of the power range shown in the sector power diagram, and the range shown in FIG. 4B is the power range shown in the sector power diagram. This is a second example, and the range shown in FIG. 4C is a third example of the power range shown by the sector power diagram. As shown in FIG. 5, the sector power diagram S1 shown by the sector power diagram stored in the sector power diagram storage unit 3 has a sector shape with the BTS 200 as the top, and this radius is r1. The center position C of the sector influence diagram S1 is calculated using the latitude and longitude of the BTS 200, the above r1 and the like.

  Here, as shown in FIG. 6, the sector / terminal location information combining unit 6 determines whether or not the point Me indicated by the terminal location information stored in the terminal location information storage unit 5 exists in the sector influence diagram S1. As a result, it is determined that the point Me indicated by the terminal position information is outside the sector influence diagram S1. Then, the corrected terminal position information generation unit 7 determines whether the circle Cb centered on the BTS 200 and passing through the point Me indicated by the terminal position information is the position of the intersection Mc where the boundary line of the sector influence diagram S1 intersects or the sector influence diagram S1. The terminal position information is corrected to any one of the center positions C of the terminal, and corrected terminal position information is generated. The intersection Mc, which is the correction result of the point Me indicated by the terminal position information, is a position where the distance between the boundary of the sector influence diagram S1 and the point Me indicated by the terminal position information is the shortest distance.

(4) Third Example of Terminal Position Information Correction Method Next, details of a third example of the terminal position information correction method by the corrected terminal position information generation unit 7 will be described with reference to FIG. Note that the sector power diagram S1 shown by the sector power diagram stored in the sector power diagram storage unit 3 has a sector shape with the BTS 200 as the top, and this radius is r1.

  Here, the sector / terminal location information combining unit 6 performs a process of determining whether or not the point Me indicated by the terminal location information stored in the terminal location information storage unit 5 is included in the sector influence diagram S1. As a result, it is determined that the point Me indicated by the terminal position information is outside the sector influence diagram S1. Then, the corrected terminal position information generation unit 7 corrects the terminal position information to the center position C and generates corrected terminal position information.

(5) An example of the storage format of the sector influence diagram Next, details of the storage format of the sector influence diagram by the sector influence diagram storage unit 3 will be described with reference to FIG. FIG. 7 is an explanatory diagram for explaining the details of the storage format of the sector influence diagram by the sector influence diagram storage unit 3. The sector power diagram storage unit 3 associates the sector identifier as the above-mentioned belonging sector identifier, the update date, the base station latitude, the base station longitude, the sector center latitude, the sector center longitude, and the sector power diagram as sector power diagram information. I remember it.

(6) Example of Storage Format of Terminal Location Information Next, details of the storage format of terminal location information by the terminal location information storage unit 5 will be described with reference to FIG. FIG. 8 is an explanatory diagram for explaining the details of the storage format of the terminal location information by the terminal location information storage unit 5. The terminal location information storage unit 5 includes a user identifier that uniquely identifies a user of the mobile device 100, a terminal location information acquisition time, a user latitude that indicates the latitude of the mobile device 100, a user longitude that indicates the longitude of the mobile device 100, and the above-mentioned affiliation The sector identifier and positioning method of the sector to be associated are associated and stored as terminal location information.

(7) Example of storage format of corrected terminal location information Next, details of the storage format of corrected terminal location information by the corrected terminal location information storage unit 8 will be described with reference to FIG. FIG. 9 is an explanatory diagram illustrating details of the storage format of the corrected terminal position information by the corrected terminal position information storage unit 8. The corrected terminal location information storage unit 8 includes a user identifier that uniquely identifies a user of the mobile device 100, a terminal location information acquisition time, a corrected user latitude, a corrected user longitude, a sector identifier of the sector to which the above belongs, The positioning method is associated and stored as corrected terminal position information.

(8) Example of Flow of Position Information Management Process Performed by Communication System Next, details of the flow of position information management process (position information management method) performed by the communication system 10 will be described with reference to FIG. FIG. 10 is a flowchart for explaining the details of the flow of position information management processing performed by the communication system 10.

  First, the sector influence diagram generation unit 2 generates and acquires a sector influence diagram, and the terminal location information acquisition unit 4 acquires terminal location information (step S01, acquisition step).

  Next, the sector / terminal position information combining unit 6 determines whether or not the point Md indicated by the terminal position information is included in the sector influence diagram S1 (step S02, determination step). When it is determined that the point Md indicated by the terminal position information is included in the sector influence diagram S1, a correction process is unnecessary, and thus a series of processes ends. On the other hand, when it is determined that the point Md indicated by the terminal position information is not included in the sector influence diagram S1, the process proceeds to step S03 described later.

  In step S03, the corrected terminal position information generation unit 7 generates the corrected terminal position information by correcting the terminal position information acquired by the terminal position information acquisition unit 4 on the sector influence diagram according to the above algorithm. (Correction step). As a result, the terminal position information is corrected to a position on the sector power range closest to the measured terminal position.

  Next, the corrected terminal location information storage unit 8 stores and stores the corrected terminal location information generated by the corrected terminal location information generation unit 7 (step S04, correction step). Then, a series of processing ends.

(9) Operation and effect of the present invention The communication system 10 as the position information management system according to the present embodiment first acquires the terminal position information of the mobile device 100 and the sector identifier of the sector to which the terminal position information belongs. It is determined whether or not it exists within the sector power range defined by the sector identifier. If it is determined that the terminal position information is outside the sector influence chart, the terminal position information is corrected on the sector influence chart. As described above, when it is determined that the terminal position information does not exist in the sector influence diagram, the terminal position information is corrected to the position on the sector influence diagram, and thus should originally exist at the position on the sector influence diagram. The terminal position information of the mobile device 100 can be corrected more appropriately.

  As a result, since the positioning of the mobile device 100 can be performed more accurately, the accuracy of the analysis result in the visualization solution unit 504 can be improved, and the population distribution regarding the users using the mobile device 100 can be improved. It can be estimated more accurately.

  Conventionally, as shown in FIG. 11 (a), the mobile device C0 transmits the terminal location information and the user identifier to the terminal location information storage node C1 for each positioning method, and notifies the node C1. The terminal does not transmit the sector identifier to the conventional terminal position information acquisition node C2 (for example, as a result of a plurality of positioning techniques such as a positioning technique using one-way or two-way delay information or a positioning technique using GPS) Processing for sending and notifying only position information has been performed. On the other hand, in the communication system 10, as shown in FIG. 11 (b), the mobile device 100 uses the terminal location information storage node M1 (for example, for each positioning method) in addition to the terminal location information and the user identifier. The social sensor unit 501) is transmitted and notified, and this node M1 performs processing of transmitting the belonging sector identifier and the terminal position information to the terminal position information acquiring unit 4 for notification. The terminal position information can be corrected based on the belonging sector identifier and the terminal position information.

  Further, as shown in FIG. 5, the line L connecting the position of the BTS 200 that manages the sector influence diagram S1 and the point Md indicated by the terminal position information is at the intersection Mc where the boundary line of the sector influence diagram S1 intersects. The terminal location information is corrected. For this reason, regarding the terminal position information of the mobile device 100 that should originally exist on the sector influence chart S1, the sector influence chart is taken into account both the position of the BTS 200 and the position Md indicated by the terminal position information. The position can be corrected to a position on S1. As a result, the position of the mobile device 100 can be obtained with higher accuracy.

  Further, as shown in FIG. 6, the circle Cb that passes through the point Me indicated by the terminal position information and that is centered on the BTS 200 that manages the sector influence diagram S1 is located at the intersection Mc where the boundary line of the sector influence diagram S1 intersects. The terminal location information is corrected. For this reason, regarding the terminal position information of the mobile device 100 that should originally exist on the sector influence diagram S1, the sector influence chart is taken into account both the position of the BTS 200 and the position Me indicated by the terminal position information. Correction can be made on S1. As a result, the position of the mobile device 100 can be obtained with higher accuracy.

  Further, as shown in FIG. 6, the terminal position information is corrected to the center position C of the sector influence diagram S1. For this reason, the terminal position information of the mobile device 100 that should originally exist on the sector influence diagram S1 can be corrected to the center position C of the sector influence diagram S1. As a result, the position of the mobile device 100 can be obtained with higher accuracy.

(10) Modification In the above embodiment, as shown in FIG. 5, the sector influence diagram S <b> 1 has been described as having a sector shape with the position of the BTS 200 as a fan top. The shape of the power diagram is not particularly limited. For example, as shown in FIG. 12, the power diagram may have a shape defined by the Voronoi division method. In the sector power diagram shown in FIG. 12, the sector power diagram S1 ′ is defined for the BTS 200 ′ by the existing Voronoi diagram, and the center of gravity position C ′ is defined for this sector power diagram S1 ′. ing.

  Further, in the above-described embodiment, the position positioning information correction processing of the mobile device 100 as a mobile terminal such as a mobile phone has been described. However, the target of the position positioning information correction processing is not limited to the mobile phone, and for example, mobile communication It may be a GPS terminal that can be connected to the network. Here, when the position correction information correction target is a GPS terminal, by using the indoor base station (IMCS) to correct the terminal position information, the GPS satellite cannot be used properly. It is possible to specify whether it is located in a building or in an underground shopping area or an underground parking lot.

  Furthermore, the car navigation system and the mobile device 100 may be linked. By linking in this way, even when located in an underground parking lot, it is possible to continue and properly use the car navigation system from within the underground parking lot (that is, even when entering the underground parking lot). become.

  According to the present invention, it is possible to provide a position information management system and a position information management method capable of performing positioning of a mobile terminal with higher accuracy.

DESCRIPTION OF SYMBOLS 1 ... Sector information storage part, 2 ... Sector influence figure production | generation part, 3 ... Sector influence figure storage part, 4 ... Terminal position information acquisition part, 5 ... Terminal position information storage part, 6 ... Sector / terminal position information coupling | bond part, 7 ... corrected terminal position information generation unit, 8 ... corrected terminal position information storage unit, 10 ... communication system, 100 ... mobile device, 101 ... CPU, 102 ... RAM, 103 ... ROM, 104 ... communication module, 105 ... auxiliary storage Device: 400 ... Switch, 500 ... Management Center, 501 ... Social Sensor Unit, 502 ... Peta Mining Unit, 503 ... Mobile Demography Unit, 504 ... Visualization Solution Unit, 505 ... Main Unit, C ... Position, C0 ... Mobile Device, C1, M1 ... terminal location information storage node, C2 ... terminal location information acquisition node, Cb ... circle, L ... line, Mc ... intersection, Md, Me P1, P2 ... point, r1 ... radius, S1 ... sector landscape.

Claims (5)

Acquisition means for acquiring terminal location information and sector information of the mobile terminal;
Determination means for determining whether or not the terminal position information indicates outside the sector influence diagram determined by the sector information, based on the terminal position information and the sector information acquired by the acquisition means;
When the determination means determines that the terminal position information indicates outside the sector influence diagram, a correction means for correcting the terminal position information to a position on the sector influence diagram;
A location information management system comprising:   The correction means corrects the terminal position information at the intersection point where the line connecting the position of the base station managing the sector power chart and the position indicated by the terminal position information intersects the boundary line of the sector power chart The position information management system according to claim 1, wherein:   The correction means corrects the terminal position information at a position of an intersection where a circle passing through the position indicated by the terminal position information intersects with a boundary line of the sector power chart centered on a base station that manages the sector power chart The position information management system according to claim 1, wherein:   The position information management system according to claim 1, wherein the correction unit corrects the terminal position information at a center position of the sector influence diagram. A location information management method performed in a location information management system for managing terminal location information of a mobile terminal,
An acquisition step in which the location information management system acquires terminal location information and sector information of the mobile terminal;
Based on the terminal location information and the sector information acquired in the acquisition step, the location information management system determines whether or not the terminal location information is outside the sector influence map determined by the sector information. A decision step;
If it is determined in the determination step that the terminal location information indicates outside the sector influence diagram, a correction step in which the location information management system corrects the terminal location information to a position on the sector influence diagram;
A location information management method characterized by comprising:

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