JP2006042023A - Method and system for judging clone of portable communication terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To quickly grasp the existence of clones of a portable communication terminal for a normal user. <P>SOLUTION: The shortest time required for movement between respective calling areas (PA) managed by each of a plurality of exchanges (20a to 20c) for a portable communication terminal (10) is previously set. When the portable communication terminal receives positional information to be transmitted in each movement between the calling areas, each exchange records the received positional information in a database mechanism (30) and records also time information indicating the recording time. In each updating of a record, the shortest time required between a calling area indicated by new positional information and the calling area indicated by the positional information recorded in the preceding time is found out, elapsed time from the preceding updating is found out by using the new time information and the time information recorded in the preceding time, and when the elapsed time is shorter than the shortest time required which is indicated by the shortest required time found out in the preceding time, a message indicating that the updating is not valid is recorded in the database mechanism (30). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for determining the possibility of a clone terminal for a mobile communication terminal existing in the system in a communication system for a mobile communication terminal such as a mobile phone.

  Conventionally, it has been known that a copy called a clone terminal can be created theoretically by illegally writing a telephone number or a user ID of a mobile phone into another mobile phone. This clone terminal may be created by a malicious third party using the fact that the terminal behaves like a regular terminal. If a malicious third party illegally uses a line with a clone terminal, for example, a criminal act imposing a huge communication fee that the principal does not know or impersonating a regular user May occur.

  As a method for preventing such a problem related to the clone terminal, for example, there are methods described in Patent Documents 1 and 2 described later. In the method described in Patent Document 1, when a call is made from a mobile terminal having the same terminal number and authentication information as a regular use mobile terminal, the area number of the base station in the area where the calling mobile terminal exists is Then, it is determined whether or not the location registration area number based on the terminal number of the calling mobile terminal matches.

In addition, the method described in Patent Document 2 is the last when a mobile terminal location registration process is performed and there are a plurality of mobile terminals having the same telephone number, regardless of whether or not they are regular mobile terminals. Focusing on the fact that only the location-registered base station information remains, and when the other mobile terminal transmits under the control of another base station, the location registration information is compared with the transmitted base station information.
JP 2000-184447 A JP 2001-025067 A

  In general, each time a communication area changes, a mobile communication terminal transmits new position information to the base station. For example, when a user carrying a clone terminal moves between communication areas, or When the clone terminal is created and the power is turned on, the position information of the clone terminal is registered as the latest position information. Therefore, when a clone terminal calls in this state, the method of Patent Documents 1 and 2 above determines that the clone terminal is authentic because the position information of the called clone terminal matches the latest position information. As a result, it becomes difficult to detect the presence of the clone terminal.

  This invention is made | formed in view of the said subject, and it aims at providing the clone determination method which can grasp | ascertain presence of a clone terminal rapidly.

  The mobile communication terminal clone determination method according to the present invention sets a minimum required time required for movement between each call area under the jurisdiction of a plurality of exchanges for a mobile communication terminal. When receiving positional information to be transmitted for each movement between calling areas, to the database mechanism connected to the plurality of exchanges, the received positional information is recorded and time information indicating the recording time is recorded, Each time the record is updated, the minimum required time between the call area indicated by the new position information and the call area indicated by the previously recorded position information is obtained, and the new time information and the previously recorded time information are used. The elapsed time from the previous update is obtained, and when the elapsed time is shorter than the shortest required time indicating the obtained shortest required time, the database device indicates that the update is not valid. It is a method that is recorded in the.

  The mobile communication terminal clone determination system according to the present invention includes a mobile communication terminal, a plurality of exchanges having jurisdiction over a plurality of calling areas for the mobile communication terminals, and a database mechanism connected to each of the exchanges, Each exchange has a recording unit that records the position information in the database mechanism and receives time information indicating the time of the recording when the portable communication terminal receives the position information transmitted for each movement between calling areas. Each time the recording unit updates the recording, the minimum required time between the calling area indicated by the new position information and the calling area indicated by the previously recorded position information is obtained, and the new time information and the previously recorded time are obtained. A determination unit that determines an elapsed time from the previous update using information and determines whether the elapsed time is longer than the determined minimum required time, and the recording unit includes the determination Accordingly, when the elapsed time is determined to less than the minimum required time, and records the fact the update is not valid in the database mechanism.

  According to the present invention, when the location information is updated by moving the mobile communication terminal between the call areas, the validity of the update is determined based on the logical distance between the call areas before and after the update and the update time interval. Since the determination is made, the clone terminal can be determined even in a standby state where no call is made. Therefore, even if a clone terminal exists, it is possible to quickly detect the presence of the clone terminal, and as a result, unauthorized use of a line due to a call can be prevented.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows the configuration of a system according to an embodiment of the present invention. The system 100 according to the embodiment includes a mobile phone 10 which is a mobile communication terminal, a plurality of mobile communication switches 20a to 20c each containing a plurality of base stations 15 and having jurisdiction over a predetermined range of calling areas, and a mobile communication switch. And an HLR (Home Location Register) 30 that is a database mechanism connected to 20a to 20c. FIG. 1 shows an example in which the call area of the mobile communication switch 20a is PAmn (PA: Paging Area), the call area of the mobile communication switch 20b is PAxy, and the call area of the mobile communication switch 20c is PAop. ing.

  The HLR 30 stores a conversion table in which a logical distance indicating a relative level of the shortest required time between each calling area is associated with a combination of a pair of calling areas. FIG. 2 shows an example of the conversion table. In the conversion table, a plurality of calling areas are similarly assigned to vertical and horizontal headings, and a numerical value of a logical distance is set at a location where a pair of calling areas intersect. In the illustrated example, the logical distance is partially described for simplification of the drawing. However, in actual operation, the logical distance is set at all locations.

  Here, the logical distance is a value for relatively judging the shortest required time for moving from one calling area to another, and the value is a physical distance between the two areas. And the moving means. For example, when comparing Tokyo-Sapporo and Tokyo-Kyoto in terms of physical distance, the former is longer than the latter, but as a means of transportation, for example, using the airplane for the former and the train for the latter The time required for the latter is longer than that for the former. Therefore, as the logical distance in this case, a larger value is set for the latter between Tokyo and Kyoto than for the former between Tokyo and Sapporo.

  Thus, the logical distance is set according to the moving means in view of the physical distance. In addition, a moving means can be changed suitably, for example, it can also be set as the movement by a motor vehicle all or part between areas instead of using the above public transportation. Then, whenever the moving means is changed, the value of the logical distance is changed as necessary.

  The numerical value of the logical distance shown in FIG. 2 indicates the above-described logical distance in seven stages from “1” to “7”. Indicates that it will take more time. For example, according to the conversion table shown in the drawing, the logical distance to PAxy is “1” and the logical distance to PAop is “7” for the calling area PAmn. PAop is “distant”. In the example shown in the figure, the logical distance is expressed in 7 levels, but the present invention is not limited to this, and other level settings such as 5 levels and 10 levels may be used.

  Also, as shown in FIG. 2, the shortest required time is set for each level in the logical distance of the conversion table. This is the shortest required time that can be assumed for moving by using the public transportation system or automobile as described above. In the illustrated table, for example, for the logical distance “1”, the minimum required time is set to “10 minutes”, but this is determined that the movement between the calling areas within 10 minutes is abnormal. It prescribes what should be done.

  The mobile communication exchanges 20a to 20c each have the same function. For example, the mobile communication exchange 20a has a recording unit 21 and a determination unit 22 as its functional configuration as shown in FIG. When the recording unit 21 receives a location registration signal including location information that is transmitted each time the mobile phone 10 moves between calling areas, the recording unit 21 records the location information on the HLR 30 and time information indicating the time of the recording. Record.

  The determination unit 22 obtains the logical distance between the calling area indicated by the new position information and the calling area indicated by the previously recorded position information from the conversion table of the HLR 30 each time the recording unit 21 updates the record. The elapsed time from the previous update is obtained using the new time information and the previously recorded time information. Furthermore, it is determined whether the update is valid based on the obtained elapsed time and logical distance. If it is not valid, the fact is recorded in the HLR 30 by the recording unit 21.

  The operation procedure of the system 100 according to the embodiment will be described with reference to the flowchart shown in FIG. Here, the behavior of the system when the mobile phone 10 existing in the call area PAmn of the mobile communication switch 20a in FIG. 1 moves to the call area PAxy of the mobile communication switch 20b will be described.

  When the mobile phone 10 existing in the call area PAmn moves to the call area PAxy, a location registration signal including the location information of the PAxy and the telephone number of the mobile phone 10 is sent via the base station 15 to the mobile communication switch 20b. (Step S1). When receiving the location registration signal from the mobile phone 10 (step S2), the mobile communication exchange 20b receives location information indicating the moved call area PAxy and time information at that time in order to update the registration contents of the HLR 30. Transmit to the HLR 30 (step S3).

  On the other hand, when the HLR 30 waiting for an update instruction from each mobile communication switch receives the above-described position information and time information from the mobile communication switch 20b, the HLR 30 registers them by storing them as the latest position information regarding the mobile phone 10. The contents are updated (step S4). Thereby, it is recorded that the calling area of the mobile phone 10 at this time is PAxy.

  Subsequently, the mobile communication switch 20b relates to the movement of the mobile phone 10, and the logical distance between the call areas and the minimum required time, that is, the logical distance between the call area PAmn before the movement and the call area PAxy after the movement. And the minimum required time is inquired in the conversion table of HLR 30 (step S5). The HLR 30 searches for the logical distance and the shortest required time using the conversion table shown in FIG. 2, and notifies the mobile communication switch 20b of the search result (step S6). Here, it is notified from FIG. 2 that the logical distance between the calling areas PAmn and PAxy is “1”, and the shortest required time is “10 minutes”.

  The mobile communication switching device 20b determines whether or not the current location information update by the mobile phone 10 is valid based on the search result of the HLR 30 (step S7). This determination procedure will be described with reference to FIG. The record shown in FIG. 4 is a registration history of location information related to the mobile phone 10 whose telephone numbers and IDs are “090-1234-5678” and “abcd”. Here, the registration time in the calling area PAmn before the movement is “10:00”, and then the calling area PAxy after the movement is registered in “11:00” by the update in step S3 described above. It has been shown.

  The mobile communication switching device 20b determines the validity of the update by confirming whether the elapsed time from the previous update is longer than the minimum required time of the logical distance. Specifically, in FIG. 4, it is recognized from the difference between the previous registration time “10:00” and the current registration time “11:00” that the elapsed time from the previous update is “1 hour”. To do. Since this “1 hour” is longer than the shortest required time “10 minutes” of the logical distance “1” (see FIG. 2), it is determined that this update is valid (step S7: Yes). ).

  Further, suppose that the mobile phone 10 is recorded with the movement to the calling area PA01 at the subsequent registration time “11:15” as shown in FIG. In this case, in the same manner as described above, the elapsed time from the previous update is determined to be “15 minutes” from the difference between “11:00” and “11:15”, and the calling area PAxy The conversion table recognizes that the logical distance between PA01 and PA01 is “3” and that the shortest required time is “1 hour”.

  Since the above case indicates that the update was performed in “15 minutes” shorter than the original minimum required time “1 hour”, the mobile communication switching device 20b has an abnormal time interval for this update. Based on the determination that there is, it is determined that the current update is not valid (step S7: No). Then, the fact is recorded in the HLR 30 (steps S8 and S9).

  When updated at an abnormal time interval as in the above case, there may be a clone terminal for the mobile phone 10 of the authorized user. The telecommunications carrier analyzes the contents recorded in the HLR 30 from each mobile telecommunications exchange for unauthorized updates, at predetermined time intervals or at an arbitrary time point, and investigates the existence of a clone terminal.

  According to the system 100, since the validity of the update is determined based on the location information updated by the movement of the mobile communication terminal 10 and the update time interval, the mobile phone 10 does not perform a call or data communication. Even in the state, the clone terminal can be determined. Therefore, even if a clone terminal is created for a legitimate user's mobile communication terminal, the existence of the clone terminal can be quickly investigated, and the legitimate user's line is illegally used and a large communication fee is charged. You can avoid that.

  In addition, the system 100 also performs clone determination for the mobile phone that has made a call request while monitoring position information according to the above-described procedure. Specifically, when the mobile phone 10 issues a call request from, for example, the call area PAop of FIG. 1, the mobile communication switch 20c having jurisdiction over this area performs normal call processing and makes a call. The position information included in the request signal is compared with the latest position information registered in the HLR 30 at the present time. This comparison may be performed in the call end process. If the position information is different as a result of the comparison, the fact is recorded in the HLR 30. The fact that the location information at the time of the call is different from the location information registered as the latest at that time indicates that the call is illegally using the line.

  If the mobile phone 10 that made the above call request is a clone terminal, and this terminal makes a call immediately after moving to the call area PAop, the location information is updated by the movement, Although it is determined that the location information at the time of the call is valid, according to the system 100, when the location information is updated before the call, the determination described with reference to FIG. Since the determination based on this is performed, it is possible to prevent the presence of the clone terminal from being overlooked.

  In addition to the determination based on the update time of the position information described above, the system 100 can also assist the determination of the clone terminal by performing the following determination. As one of the methods, for example, each mobile communication switch 20a-20c extracts the position information recorded in the HLR 30 for a predetermined period, and whether or not there is a predetermined number of changes in the area of the call area of the extracted position information. It is a method of judging.

  This method will be described with reference to an example shown in FIG. In FIG. 5, for the sake of explanation, the “call area” indicated by the position information is described in correspondence with the “registration time”, and the movements 5a to 5f are performed at appropriate time intervals. Examples are shown. The appropriate time interval set here is, for example, 1 hour for the movement 5a from “Saitama” to “Tokyo Kita”, and 2 hours and 30 minutes for the subsequent movement 5d from “Sapporo” to “Yokohama”.

  Focusing on the transition of the movement of the calling area on the date “2004.7.2” shown in FIG. 5, the movement from “Saitama” to “Tokyo North” via “Tokyo North” by the movements 5a to 5b is “ The movements within the Kanto area from 9:00 to 10:30, but the subsequent movements 5d to 5f in the order of “Sapporo”, “Yokohama”, “Asahikawa”, “Tokyo Kita” From 15:30 ”to“ 23:30 ”, it can be seen that the area has changed three times. When movement to a different area is detected three or more times within such a continuous time, it is recorded that the update of the position information during this period is not appropriate. In other words, repeated movements to different areas are generally not considered appropriate, and are therefore processing for recording that suggests the possibility of a clone terminal. Thereby, even if the update interval of the position information of the clone terminal is appropriate, it is possible to prevent the existence of the clone from being overlooked.

  In determining the area of each calling area, the list of logical distances corresponding to the physical distances is set separately from that shown in FIG. 2, that is, the logical distance based on the time required for movement. The call area difference is determined based on the logical distance corresponding to. For example, for “Tokyo North”, “Saitama” in the Kanto area is set to the same logical distance, and “Sapporo” in Hokkaido is set to a different logical distance. In addition, the function for detecting changes in the area and the allowable number of movements between areas are set in the determination unit 22 in advance.

  In addition, as a method for assisting the determination of the clone terminal, for example, paying attention to a call history of a regular user, a call that has been an average of about several minutes in an average call time is a number of calls of one hour or more. If a record such as occurrence or an international call is detected, the fact that the line is being used illegally is recorded. This is based on the fact that the users of clone terminals tend to use other people's lines without considering communication charges. Also, paying attention to the history of communication charges, if a high payment fee such as 50,000 yen or 100,000 yen is generated for a user who was charged about 10,000 yen every month, the possibility of a clone terminal Is recorded and notified to the authorized user, the reliability of the communication carrier for the authorized user can be improved.

  In the embodiment described above, the conversion table shown in FIG. 2 is stored in the HLR 30, but not limited to this, the conversion table may be stored in each of the mobile communication exchanges 20a to 20c. In the conversion table, the value corresponding to the combination of a pair of call areas can be the shortest required time between the call areas instead of the logical distance as shown in FIG.

  In the above-described embodiment, an example in which a mobile phone is used as the mobile communication terminal of the present invention has been described. However, the scope of application of the present invention is not limited to this, for example, PHS (registered trademark) or a wireless communication function in a personal computer The present invention can be used for clone determination for a wireless card or the like for providing

It is a block diagram of the system of the Example by this invention. It is explanatory drawing for demonstrating the conversion table of an Example. It is a flowchart which shows the operation | movement procedure of an Example. It is explanatory drawing for demonstrating the determination procedure of an Example. It is explanatory drawing for demonstrating the additional determination procedure in connection with an Example.

Explanation of symbols

100 System 10 Cellular Phone 15 Base Stations 20a to 20c Mobile Communication Exchange 21: Recording Unit, 22: Determination Unit 30 HLR

Claims (8)

Set the minimum time required to move between each call area under the jurisdiction of each of the exchanges for mobile communication terminals,
When each of the exchanges receives position information transmitted by the mobile communication terminal for each movement between calling areas, the received position information is recorded in the database mechanism connected to the plurality of exchanges and the record is recorded. Every time time information indicating time is recorded and the record is updated, the shortest required time between the call area indicated by the new position information and the call area indicated by the previously recorded position information is obtained, and new time information is obtained. And when the elapsed time from the previous update is obtained using the time information recorded last time and the elapsed time is shorter than the shortest required time indicating the obtained shortest required time, the database mechanism is informed that the update is not valid. A portable communication terminal clone determination method, comprising: recording. A conversion table in which the logical distance indicating the relative level of the shortest required time between each calling area is associated with a combination of a pair of calling areas is set in the database mechanism,
2. The mobile communication terminal clone determination method according to claim 1, wherein each of the exchanges refers to the conversion table when obtaining the minimum required time.   Each of the exchanges compares the call area indicated by the call request from the mobile communication terminal with the call area indicated by the latest location information recorded in the database mechanism at the time of receiving the call request. The mobile communication terminal clone determination method according to claim 1 or 2, wherein when it is different, the fact is recorded in the database mechanism.   Each of the exchanges extracts the position information recorded in the database mechanism for a predetermined period, and when there is a predetermined number of changes in the area of the calling area indicated by the extracted position information, the update of the position information for the predetermined period is not valid The mobile communication terminal clone determination method according to any one of claims 1 to 3, wherein the data is recorded in the database mechanism. A mobile communication terminal, a plurality of exchanges having jurisdiction over a plurality of calling areas for the mobile communication terminal, and a database mechanism connected to each of the exchanges,
Each switch is
A recording unit that records the position information in the database mechanism and records time information indicating the time of the recording when the mobile communication terminal receives the position information transmitted every time the mobile communication terminal moves between calling areas;
Each time the recording unit updates the recording, the minimum required time between the calling area indicated by the new position information and the calling area indicated by the previously recorded position information is obtained, and the new time information and the previously recorded time are obtained. Determining the elapsed time from the previous update using information, and determining whether the elapsed time is longer than the determined minimum required time,
When the determination unit determines that the elapsed time is shorter than the shortest required time, the recording unit records in the database mechanism that the update is not valid. . The database mechanism maintains a conversion table in which a logical distance indicating a relative level of the shortest required time between each calling area is associated with a combination of a pair of calling areas,
6. The portable communication terminal clone determination system according to claim 5, wherein the determination unit of each exchange refers to the conversion table when obtaining the shortest required time.   The determination unit compares the call area indicated by the call request from the mobile communication terminal with the call area indicated by the latest location information recorded in the database mechanism at the time of receiving the call request. The mobile communication terminal clone determination system according to claim 5 or 6, wherein when it is different, the fact is recorded in the database mechanism.   The determination unit extracts the position information recorded in the database mechanism for a predetermined period, and when there is a predetermined number of changes in the area of the calling area indicated by the extracted position information, the update of the position information for the predetermined period is not valid. Is recorded in the database mechanism. The mobile communication terminal clone determination system according to any one of claims 5 to 7.

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