JP2000354272A - Mobile communication system for detecting mobile terminal unauthorized use and method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect and eliminate an unauthorized mobile terminal by collating calling data on a mobile communication system side stored inside a home location register(HLR) with-transmitted calling data on a mobile terminal side. SOLUTION: A mobile terminal 1 receives a calling data request sent from a mobile subscriber exchange 8 and sends out the calling data stored in a calling recording part 3 as response signals. The mobile subscriber exchange 8 writes the calling data of a searching object mobile terminal among the calling data on a net side stored in the HLR 11 to a net side initial call recording part after sending out the calling data request. A calling data processor 13 compares and collates the written calling data with the calling data written in a mobile terminal side calling recording part and writes '1' to a collated result recording part when they do not match as the result of collation. The calling data processor 13 sends a subscriber number whose collated result is non-matching to the mobile subscriber exchange 8 and sets calling inhibition to the subscriber data of the HLR 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an apparatus and a method for detecting unauthorized use of a mobile terminal in a mobile communication system.

[0002]

2. Description of the Related Art Due to the strong demands of mobile communication for talking to anyone anytime and anywhere, and the rapid development of communication technology, various types of mobile communication represented by mobile phones have been rapidly spreading in the world. I have.

Along with this, mobile terminals, which are portable telephones, are illegally copied, and illegal mobile terminals (illegal subscribers) impersonating legitimate subscribers are increasing. Subscribers are charged unfairly and often cannot identify the unauthorized user,
There is a risk of seriously hindering toll collection operations of telecommunications carriers.

[0004] In order to prevent such a problem, various mobile terminal authentication methods have been proposed for determining whether a mobile terminal making a call is an authorized subscriber or an unauthorized subscriber.

FIG. 8 shows a schematic configuration of a first conventionally proposed mobile terminal authentication method. The first mobile terminal authentication method will be described with reference to FIG.

[0006] When the mobile terminal (MS) 1 calls to make a call, the mobile subscriber exchange (MLS) 8 sends a call to the home location register (HLR) 11 for the authentication key stored in advance in the subscriber data. An authentication key readout 80 is performed and written as a verification authentication key 81 in the memory of the mobile subscriber exchange 8.

[0007] The mobile subscriber exchange 8 sends an authentication request 82 to the mobile terminal 1.

[0008] The mobile terminal 1 that has received the authentication request 82
Performs an authentication key input request display 83 instructing the mobile terminal display unit to input an authentication key.

[0009] The user of the mobile terminal 1 looks at the authentication key input request display 83 displayed on the mobile terminal display unit, and inputs the authentication key by operating the key unit of the mobile terminal 1.

[0010] The mobile terminal 1 sends the inputted authentication key to the mobile subscriber exchange 8 as an authentication response 85.

The mobile subscriber exchange 8 performs a collation process 86 to determine whether the authentication key received from the mobile terminal 1 matches the authentication key 81 for collation written in the memory of the mobile subscriber exchange 8.

If the user of the mobile terminal 1 is an authorized subscriber, the user knows the contents of the authentication key stored in the subscriber data of the home location register 11 in advance and can input the correct authentication key. 86 matches.

If the user of the mobile terminal 1 is an unauthorized subscriber, the contents of the authentication key stored in the subscriber data of the home location register 11 are not known in advance and a correct authentication key cannot be input. It does not match.

As described above, the discrimination between the authorized subscriber and the unauthorized subscriber is made. However, in the first mobile terminal authentication method, since the authentication key is manually input from the key portion of the mobile terminal 1, even a legitimate subscriber forgets the content of the authentication key or makes an input error. Sometimes.

Further, since the authentication key input from the mobile terminal 1 propagates as an authentication response over a wireless line, anyone can easily monitor the contents of the authentication key by illegally monitoring this radio wave with a wireless protocol analyzer or the like. You can know.

FIG. 9 shows a schematic configuration of a second conventionally proposed mobile terminal authentication method. The second mobile terminal authentication method will be described with reference to FIG.

When the mobile terminal (MS) 1 makes a call to make a call, the mobile switching center (MLS) 8 checks the authentication key stored in the subscriber data of the home location register (HLR) 11 in advance. An authentication key readout 80 is performed and written as a system-side authentication key 81 in the memory of the mobile subscriber exchange 8.

The mobile subscriber exchange 8 has a random number generation function, and writes the generated random number into the memory of the mobile subscriber exchange 8 as a system-side random number 90, and authenticates the random number to the mobile terminal 1. Sent as request 91.

The mobile terminal 1 that has received the random number as the authentication request 91 writes the random number 92 into the memory of the mobile terminal 1.

The mobile terminal 1 has a terminal-side authentication key 93 stored in the memory of the mobile terminal 1 in advance, and performs an encryption operation 94 using this value and the terminal-side random number 92 sent from the system. The calculated value is sent to the mobile subscriber exchange 8 as an authentication response 95.

The mobile subscriber exchange 8 performs an encryption operation 96 using the system-side authentication key 81 and the system-side random number 90 written in the memory of the mobile subscriber exchange 8, and calculates the operation value 97 and the mobile terminal 1 A collation process 98 is performed to determine whether or not the values of the authentication response 95 sent from the server match.

When the mobile terminal 1 is an authorized subscriber, the terminal-side authentication key having the same content as the system-side authentication key previously stored in the subscriber data of the home location register 11 is stored in the memory of the mobile terminal 1. Since the mobile terminal side encryption operation processing 94 and the system side encryption operation processing 96 perform the same processing, the results of the collation processing 98 match.

When the mobile terminal 1 is an unauthorized subscriber, the memory of the mobile terminal 1 has a terminal-side authentication key having the same content as the system-side authentication key stored in the subscriber data of the home location register 11 in advance. Therefore, even if the mobile terminal side encryption operation processing 94 and the system side encryption operation processing 96 perform the same processing, the result of the collation processing 98 does not match.

As described above, a legitimate subscriber and an unauthorized subscriber are determined. Then, in this second mobile terminal authentication method, the terminal-side authentication key is not manually input from the mobile terminal key unit, but the terminal-side authentication key is stored in advance in the memory of the mobile terminal. The authentication key manual input error problem in the mobile terminal authentication method does not occur.

In the second mobile terminal authentication method,
The authentication response signal sent over the wireless link from the mobile terminal to the mobile subscriber exchange transmits not the authentication key itself but a value obtained by performing an encryption operation on the authentication key, so that the authentication key can be easily monitored even if the wireless link is monitored. Can not know the contents of.

[0026]

As described above, the conventional mobile terminal authentication method employs a method of discriminating by collation of an authentication key including an encryption process.

However, recently, a memory section of a stolen mobile terminal or a misplaced mobile terminal is illegally read, and a subscriber number and a mobile terminal identification number (hereinafter, referred to as subscriber data) which are subscriber data held by the mobile terminal. By obtaining the contents such as MIN number), authentication key, etc., and writing this information in its entirety to a new mobile terminal, an unauthorized mobile terminal (so-called “clone terminal”) with exactly the same contents as a legitimate mobile terminal is created. Cases are increasing, and in such cases, it has not been possible to eliminate this unauthorized mobile terminal using the conventional mobile terminal authentication method.

The present invention has been made in view of the above,
The purpose is to provide a call recording unit on the mobile terminal side, send the call data of the mobile terminal recorded here to a call data processing device installed on the mobile communication system side,
This call data processing device detects and eliminates an unauthorized mobile terminal by comparing the call data of the mobile communication system stored in the home location register with the call data of the transmitted mobile terminal. Is made possible.

[0029]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a mobile communication system and method for detecting unauthorized use of a mobile terminal according to the present invention include: a mobile terminal having a call recording unit; A mobile subscriber exchange having a call data processing device, and (a) the mobile terminal stores call data of a preset type every time a call is made by the call recording unit. (B) the mobile subscriber exchange sends, at regular intervals or in a timely manner, a request for call data to a mobile terminal registered in advance; and Means for storing the stored network-side outgoing call data of the mobile terminal in the outgoing call data processing device; and (c) the mobile terminal transmits a request for outgoing call data from the mobile subscriber exchange. received Then, means for sending the mobile terminal-side call data recorded in the call recording unit to the mobile subscriber exchange, and (d) the mobile subscriber exchange sends the received mobile terminal-side call data to the mobile subscriber exchange. Means for storing in the call data processing device, and (e) the outgoing call data processing device verifies the mobile terminal side call data and the network side call data, and incorrectly identifies the mobile terminal having a mismatched verification result. A means for determining a mobile terminal is provided.

Further, the mobile subscriber exchange includes means for making a call prohibition setting for the mobile terminal corresponding to the subscriber number for which the unauthorized mobile terminal has been detected, and means for making a call prohibition setting for the mobile terminal having made the call prohibition setting. Means for sending an announcement that the use has been suspended.

That is, according to the present invention, when a call is made by an unauthorized mobile terminal, the call data on the network side is replaced by the call data used by the unauthorized mobile terminal, compared to the call data recorded on the authorized mobile terminal. Is recorded in large numbers, it is assumed that if there is a mismatch between the call data on the mobile terminal side and the call data on the network side and there is no match, there is an unauthorized mobile terminal.

[0032]

Embodiments of the present invention will be described below with reference to the drawings. In FIGS. 1 to 9, the same reference numerals are given to the same parts in the drawings, and the overlapping description will be omitted as appropriate.

FIG. 1 shows the overall configuration of a mobile communication system according to the present invention. An overall configuration diagram of the present invention will be described with reference to FIG. As shown in FIG. 1, the mobile terminal 1 (MS1), which is a regular subscriber, is provided with a call recording unit 3 on the mobile terminal side, and stores the subscriber data held by the mobile terminal as a subscriber number: 1234. , MIN number: 5678, Authentication key:
ABCD.

The subscriber number is a number for designating a call (subscriber) to be used in call processing of the mobile communication system, and an arbitrary number which is not duplicated for each subscriber. The MIN number is an identification number unique to each mobile terminal, and is a fixed number that is not duplicated for each mobile terminal.

The subscriber data of the mobile terminal 2 which is an unauthorized subscriber has the same subscriber number: 1234 and MIN as the regular subscriber.
Number: 5678, Authentication key: ABCD.

On the mobile communication system side, a base station 4 (BTS1) and a base station 5 (BT
S2), a base station controller 6 (BSC) connected to these base stations 4 and 5 by a wired line, and a mobile communication exchange 7 (MSC) connected to the base station controller 6 by a wired line.
C).

The mobile communication exchange 7 is connected to a public telephone network 14 (PS
TN), and a wired subscriber 15 is connected via the public telephone network 14, and the wired subscriber number is 9876.

The mobile communication exchange 7 controls a mobile subscriber exchange 8 (ML) which controls overall call processing for the mobile subscriber.
S), a mobile gateway exchange 9 (MGS) for controlling the interface with the public telephone network 14 and controlling between a plurality of mobile subscriber exchanges, and mobile subscriber data (mobile subscriber class, various service information, call information). Home location register 1 in which location information of mobile subscribers and the like are stored.
No. 1 (HLR), which is responsible for the transfer of various information between the mobile subscriber exchange 8 and the mobile gateway exchange 9 and the home location register 11. 7 common line signal device 10 (NO. 7ST)
P), an announcement device 12 for providing various types of voice information to mobile terminal subscribers, and a call data processing device 13 for collating the mobile terminal call data and the system call data.

FIG. 2 shows the configuration of the mobile terminal 1 shown in FIG. The configuration of the mobile terminal 1 will be described with reference to FIG. As shown in FIG. 2, the mobile terminal 1 includes a transmitting unit 21 that transmits radio frequency radio waves, a receiving unit 22 that also receives radio frequency radio waves, one antenna 27 and a transmitting unit 2.
A switch unit 20 for switching the connection of each of the first to the receiving unit 22; a baseband unit 23 for processing a baseband signal before modulation of the transmission unit 21 and a baseband signal after demodulation of the reception unit 22; A display unit and a key unit 24 for controlling the interface; a CPU and a DSP 25 for performing overall control and data processing of the mobile terminal 1; a memory unit 26 for storing an overall operation program and various data of the mobile terminal 1; It comprises a call recording unit 3 for storing.

FIG. 4 shows the call data processing device 13 shown in FIG.
It shows the configuration of FIG. The configuration of the call data processing device 13 will be described with reference to FIG. As shown in FIG. 4, the call data processing device 13 includes an interface unit 40 for exchanging information with the mobile subscriber exchange 8, and a memory unit 42 for storing an operation program of the call data processing device 13 and various data. A network-side call recording unit 42a for storing network-side call data, a mobile-terminal-side call record unit 42b for storing mobile-terminal-side call data, a network-side call data and a mobile-terminal-side call data. A matching unit 43 for performing a matching process with
A collation result recording unit 42c for storing the collation results of the above, and a CPU for performing overall control and data processing of the call data processing device 13.
41.

FIG. 3 is an example of a memory layout diagram in the call recording unit 3 of the mobile terminal 1 shown in FIG. 1 and FIG. This corresponds to call data 1 (30) to call data 10 (3
3) 10 outgoing call data are recorded, and the types of outgoing data include the subscriber number 30a and the MIN number 30.
In this example, eight types are recorded: b, call partner number 30c, call date 30d, call start time 30e, call end time 30f, call time 30g, and base station number 30h.

In the configuration shown in FIG. 1, the mobile terminal 1 sends a signal to the wired subscriber 15 from 3:00 pm on April 1, 1999.
The calling data when a call is made via the base station 1 for
30a = 1234, 30b = 5678, 30c = 987
6, 30d = 1999.4.1, 30e = 15: 00,
30f = 15: 01, 30g = 60s, and 30h = 1.

The number and types of the call data to be recorded are for discriminating the authorized subscriber from the unauthorized subscriber, and the memory capacity of the mobile terminal and the call data processing device as hardware conditions. The optimal number and type are set in a timely manner according to the memory capacity of the network, the accuracy of detection of unauthorized subscribers as service conditions, the number of mobile terminals to be investigated, the processing capacity of mobile subscriber exchanges and mobile terminals as software conditions, system traffic conditions, etc. And

FIG. 5 shows the network side call recording section 42a and the mobile terminal side call recording section 4 of the call data processing apparatus shown in FIGS.
2b is an example of a memory layout diagram in the collation result recording unit 42c, in which three mobile terminals having a subscriber number 1234, a subscriber number 1235, and a subscriber number n are to be investigated.

Then, as described in the collation result recording section 42c, the presence of an unauthorized mobile terminal in the subscriber number 1234, that is, the collation result between the network side call data and the terminal side call data does not match. And subscriber number 123
5 and the subscriber number n indicate that there is no unauthorized mobile terminal, that is, the collation result between the network-side call data and the terminal-side call data matches.

The type of call data to be recorded is shown in FIG.
Are the same as the types of call data recorded in the call recording unit 3 of the mobile terminal 1 (eight types in this example).

As described above, according to the present invention, the call recording unit is provided on the mobile terminal side and the mobile communication system side, and the call data on the mobile terminal side is sent to the mobile communication system side and installed on the mobile communication system side. The call data processing device described above can compare both call records.

Next, the operation of the present invention thus configured will be described with reference to FIGS. FIG. 6 is an operation sequence chart in a case where an unauthorized mobile terminal exists in the mobile communication system of the present invention and this mobile terminal is used illegally.

As shown in FIG. 6, first, as outgoing call 1, mobile terminal 1 (MS1), which is a regular subscriber, sends outgoing call 1 (10
0), call setting 1 (101) is performed with the mobile subscriber exchange 8 (MLS), and a call 1 with the wired subscriber 15 is performed.
(102) is completed.

Next, as outgoing call 2, mobile terminal 1 (MS1)
Sends outgoing call 2 (103) and sends a message to mobile subscriber exchange 8 (ML).
S), call setting 2 (104) is performed, and wired subscriber 1
The call 2 (105) with No. 5 is completed.

Next, as outgoing call 3, the mobile terminal 2 (MS2), which is an unauthorized subscriber, sends outgoing call 3 (106) and performs call setting 3 (107) with the mobile subscriber exchange 8 (MLS). Completes the call 3 (108) with the wired subscriber 15.

As described above, outgoing call data of a preset type of outgoing call 1 and outgoing call 2 relating to the mobile terminal 1 are recorded in the outgoing call recording unit 3 of the mobile terminal 1 every time an outgoing call is made. The outgoing call data of outgoing calls 1 to 3 on the network side are stored as billing data in the subscriber data of the home location register 11 of the mobile communication exchange 7.

The mobile subscriber exchange 8 (MLS) activates an illegal mobile terminal detection operation at regular intervals or timely, and sends a call data request 109 to a mobile terminal to be investigated which is registered in advance.

The outgoing call request 109 sent from the mobile subscriber exchange 8 is received by the waiting mobile terminal 1 in the mobile communication service area. An aggregation process 110 is performed in order to send the stored outgoing call data of a preset number and type as shown in FIG.

The mobile terminal 1 that has completed the aggregation sends outgoing call data 112 to the mobile subscriber exchange 8 as a response signal to the outgoing call request 109.

After the mobile subscriber exchange 8 sends the call data request 109 to the mobile terminal 1, the network-side call data stored in the subscriber data area of the home location register 11 of the mobile communication exchange 7 is transmitted. Among them, a totaling process 113 is performed to send a predetermined number and types of call data relating to the mobile terminals to be investigated to the call data processing device, and the total result is recorded on the network side call record of the call data processing device. Write to the section 42a.

The mobile switching center 8, which has received the call data on the mobile terminal side, writes the information in the call recording section 42b on the mobile terminal side of the call data processing device.

Then, in the outgoing call data processing device, after the above data writing is completed, the network side call recording section 42a
Is compared and compared with the outgoing data of outgoing calls 1 and 2 written in the mobile terminal-side outgoing call recording unit 42b. As a result, collation does not match, so “1” is written to the collation result recording unit 42c.

The outgoing call data processing device includes a collation result recording unit 4
2c is sent to the mobile subscriber exchange 8, and the mobile subscriber exchange 8 calls the subscriber data in the home location register 11 corresponding to the subscriber number. Prohibition setting 115 is performed.

Thereafter, the mobile subscriber exchange 8 activates the announcement device 12 and instructs the mobile terminal 1 in which the unauthorized mobile terminal has been detected that "an unauthorized mobile terminal has been detected in the mobile terminal having the subscriber number 1234. We will stop using it. Please contact our nearest office immediately. "

In place of the announcement transmission,
A short message such as “KEIKOKU: Japanese Pine Butterfly @ Hackenshitanodeshidokimasen!” May be sent out and an alarm may be displayed on the display unit of the mobile terminal 1.

In this way, there is an unauthorized mobile terminal,
When the mobile terminal is used, the unauthorized mobile terminal detecting operation includes the operation of collecting call data on the mobile terminal side and the network side by the mobile subscriber exchange 8, and the operation of collecting the call data collected by the call data processing device. It consists of an operation of collating and an operation of determining an unauthorized mobile terminal from the result of the collation.
The mobile subscriber exchange 8 performs an operation of setting call prohibition and an operation of sending an announcement.

Next, FIG. 7 is an operation sequence chart of the mobile communication system according to the present invention in the case where there is no unauthorized mobile terminal or when this unauthorized mobile terminal is not used.

As shown in FIG. 7, this operation is similar to the operation of FIG. 6 in that the outgoing call 1 and outgoing call 2 of the mobile terminal 1 complete the call, but the outgoing call of the unauthorized mobile terminal 2 is performed. There is no difference.

Then, after completing the calling 1 and the calling 2, the respective calling data are stored in the calling recording unit 3 of the mobile terminal 1 and the subscriber data of the home location register 11 of the mobile communication exchange 7. Action, mobile subscriber exchange 8
Sends a call data request 109 to the mobile terminal to be investigated, an operation in which the mobile terminal 1 performs an aggregation process 110 in order to send a predetermined number and type of call data to the mobile subscriber exchange 8, The operation in which the terminal 1 sends outgoing call data 112 to the mobile subscriber exchange 8 as a response signal of the call data request 109 is the same as that of FIG. Aggregation processing of accumulated network-side call data 1
11 is different in that there is no call 3 but only call 1 and call 2.

Then, the collation processing between the outgoing data on the mobile terminal side and the outgoing data on the network side coincide, and "0" is written in the collation result recording section 42c. Therefore, call prohibition setting of the home location register and announcement transmission to the mobile terminal are not performed.

In this way, when there is no unauthorized mobile terminal or this mobile terminal is not used, the operation of detecting an unauthorized mobile terminal is performed by using the mobile subscriber exchange 8 to transmit call data on the mobile terminal side and the network side. It consists only of an operation of collecting and an operation of collating the call data collected by the call data processing device.

[0068]

As described above, according to the present invention,
In a mobile communication system, there is an illegal mobile terminal that is exactly the same as a legitimate mobile terminal, and when this mobile terminal is illegally used, a call recording unit is provided on the mobile terminal, and the call data of the mobile terminal recorded here is recorded. Is sent to a call data processing device installed in the mobile communication system, where the call data of the mobile communication system stored in the home location register and the transmitted data of the mobile terminal are sent. By collating the outgoing call data, an unauthorized mobile terminal having exactly the same contents as the subscriber data held by the authorized mobile terminal can be detected and eliminated.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an overall configuration of a mobile communication system according to the present invention.

FIG. 2 is a block diagram illustrating a configuration of a mobile terminal according to the present invention.

FIG. 3 is a memory layout diagram of a call recording unit of the mobile terminal of the present invention.

FIG. 4 is a block diagram showing a configuration of a call data processing device according to the present invention.

FIG. 5 is a memory layout diagram of a network side call recording unit, a mobile terminal side call recording unit, and a collation result recording unit of the call data processing apparatus of the present invention.

FIG. 6 is a sequence chart showing an operation in a case where an unauthorized mobile terminal according to the present invention is present and this mobile terminal is used illegally.

FIG. 7 shows whether there is an unauthorized mobile terminal in the present invention;
It is a sequence chart figure showing operation of the case where this unauthorized mobile terminal was not used.

FIG. 8 is a block diagram illustrating a schematic configuration of a first mobile terminal authentication method in a conventional mobile communication system.

FIG. 9 is a block diagram illustrating a schematic configuration of a second mobile terminal authentication method in a conventional mobile communication system.

[Explanation of symbols]

 Reference Signs List 1 mobile terminal 2 illegal mobile terminal 3 call recording unit 4 base station 5 base station 6 base station controller 7 mobile communication switch 8 mobile subscriber switch 9 mobile gateway switch 10 NO. 7 common line signaling device 11 home location register 12 announcement device 13 call data processing device 14 public telephone network 15 wired subscriber 20 mobile terminal antenna switch unit 21 mobile terminal transmitting unit 22 mobile terminal receiving unit 23 mobile terminal baseband unit 24 mobile Terminal display unit, key unit 25 Mobile terminal CPU, DSP 26 Mobile terminal memory unit 27 Mobile terminal antenna 40 Calling data processing device interface unit 41 Calling data processing device CPU 42 Calling data processing device memory unit 42a Calling data processing device Network side call recording unit 42b Call data processing unit Mobile terminal side call recording unit 42c Call data processing unit collation result recording unit 43 Call data processing unit collation unit

Claims (6)

[Claims] 1. A mobile terminal having a call recording unit,
In a mobile communication system including a mobile subscriber exchange having a call data processing device, the mobile terminal stores call data of a preset type every time a call is made by the call recording unit. The mobile subscriber exchange stores the mobile terminal-side call data recorded in the call recording unit of the mobile terminal registered in advance and the home location register at regular intervals or in a timely manner. Collecting the network-side call data of the mobile terminal that has been registered in advance and storing the collected call data in the call data processing device;
The outgoing call data processing device performs collation between mobile terminal side call data and network side call data, and determines a mobile terminal having a mismatched result as an unauthorized mobile terminal. How to detect usage. 2. A mobile terminal having a call recording unit,
In a mobile communication system including a mobile subscriber exchange having a call data processing device, the mobile terminal stores call data of a preset type every time a call is made by the call recording unit. The mobile subscriber exchange sends a request for calling data to a pre-registered mobile terminal at regular intervals or in a timely manner, and thereafter,
The network-side outgoing call data of the mobile terminal stored in the home location register is stored in the outgoing call data processing device, and the mobile terminal receives a request for outgoing call data from the mobile subscriber exchange. Sending the mobile terminal-side call data recorded in the call recording unit to the mobile subscriber exchange, and the mobile subscriber exchange stores the received mobile terminal-side call data in the call data processing device. The outgoing call data processing device compares the outgoing call data on the mobile terminal side with the outgoing call data on the network side, and determines a mobile terminal having a mismatched result as an unauthorized mobile terminal. How to detect unauthorized use of the terminal. 3. The mobile switching center performs call prohibition setting for a mobile terminal corresponding to a subscriber number in which an unauthorized mobile terminal is detected, and uses the mobile terminal for which call origination prohibition setting has been performed. 3. The method for detecting unauthorized use of a mobile terminal according to claim 1, wherein an announcement indicating that the mobile terminal has been stopped is transmitted. 4. A mobile terminal having a call recording unit,
In a mobile communication system including a mobile subscriber exchange having a call data processing device, the mobile terminal stores call data of a preset type every time a call is made by the call recording unit. Means for recording, at regular intervals or in a timely manner, the mobile subscriber exchange, mobile terminal-side call data recorded in the call recording unit of the mobile terminal registered in advance, and a home location register. Means for collecting network-side call data of the mobile terminal registered in advance and storing the collected call data in the call data processing device; and Mobile communication means for detecting unauthorized use of a mobile terminal, comprising: means for verifying network-side call data; and means for determining a mobile terminal having a mismatched result as an unauthorized mobile terminal. System. 5. A mobile terminal having a call recording unit,
In a mobile communication system including a mobile subscriber exchange having a call data processing device, the mobile terminal stores call data of a preset type every time a call is made by the call recording unit. Means for sending a request for calling data to a pre-registered mobile terminal at regular intervals or in a timely manner, and thereafter, stored in a home location register. Means for storing the network-side call data of the mobile terminal registered in advance in the call data processing device; and the mobile terminal receives the call data request from the mobile switching center, and Means for sending the mobile terminal-side call data recorded in the recording unit to the mobile subscriber exchange, wherein the mobile subscriber exchange receives the received mobile terminal-side call data in the call data processing. Means for storing in the device, said calling data processing device for comparing the mobile terminal-side calling data with the network-side calling data, and determining the mobile terminal having a mismatched result as an unauthorized mobile terminal A mobile communication system for detecting unauthorized use of a mobile terminal, comprising: 6. The mobile subscriber exchange includes means for making a call prohibition setting for a mobile terminal corresponding to a subscriber number for which an unauthorized mobile terminal has been detected, and means for making a call prohibition setting for a mobile terminal having made a call prohibition setting. 6. A means for sending an announcement indicating that the use has been suspended.
A mobile communication system for detecting unauthorized use of a mobile terminal described in the above.