KR20010064771A - Reproduction Mobile Terminal Detecting Method - Google Patents

Abstract

PURPOSE: A method for detecting reproduced terminals is provided to detect an illegally reproduced mobile terminal through the comparison and analysis of location registration information in case that mobile terminals having an identical MIN(Mobile Identification Number) and an identical ESN(Electronic Serial Number) execute location registration at different service zones. CONSTITUTION: If a mobile terminal located at an arbitrary service area requests location registration to an MSC/VLR managing the service area(S101), the VLR transmits the information of the mobile terminal to an HLR in which every information for the mobile terminal is set up(S102). The HLR requests the VLR to cancel location registration for the mobile terminal(S103). After receiving a response for location registration cancellation and final location registration information for the mobile terminal from the VLR(S104), the HLR transmits final location registration information for the mobile terminal to the VLR with a response message for location registration(S105). The VLR compares final location registration information with new location registration information executed currently(S106) and judges whether the currently executed location registration is a location registration by movement from an adjacent service area or a location registration by a return to a power-on state from a power-off state(S108). In case that information for the currently location-registered mobile terminal is not the location registration by movement from an adjacent service area or the location registration by the power return, the VLR judges whether the mobile terminal is set up as abnormal location registration information(S110).

Description

Reproduction Mobile Terminal Detecting Method

The present invention relates to a method for detecting a terminal that is illegally copied and used in a mobile communication network. In particular, the same subscriber number, mobile station identification number (hereinafter referred to as 'MIN'), and equipment serial number (Electronic Serial Number; When different terminals having 'ESN' are registered in different service areas, the terminal detects illegally copied theft terminals using location registration information and performs corresponding restrictions and processing. The present invention relates to a duplicated terminal detection method.

In general, a mobile communication network matches a home location register (hereinafter referred to as an 'HLR') with a mobile terminal and an HLR that stores and manages general information about a registered mobile terminal. A visitor location register that stores and manages general information about the Mobile Switching Center (hereinafter referred to as 'MSC') and its mobile terminal that move its service area. (Visitor Location Register; hereinafter referred to as 'VLR') and the Authentication Center (Authentication Center; hereinafter referred to as 'AuC') that performs authentication for the mobile terminal.

The mobile communication service using the mobile communication network configured as described above has been increasingly used due to the development of technology and low service fee. However, the service fee is inherently high, and a lot of burden is provided for the use of the service. It is true.

Therefore, illegal copying of the mobile terminal is prevalent by people with simple equipment, but since the situation of wireless communication is very difficult to detect it, the well-being subscribers are frequently damaged.

The method of duplicating the mobile terminal is to acquire the MIN and ESN of the mobile terminal registered and used by an arbitrary subscriber using a special device, and then duplicate the mobile terminal by loading the information on an abnormally distributed mobile terminal. There is a cloning theft that allows the service fee to be added to the normal subscriber, and a subscriber theft that is used until the service is stopped due to non-payment of the service fee.

Then, there is a hijacking theft that raises the output of the incoming or outgoing call to obtain the voice channel of the original waiting call and then calls a third party to make a call and discard the call record.

In the US, Fraudulent Calls is estimated to be 5-30% of all completed calls, resulting in hundreds of millions of dollars lost to service providers annually.

Such wireless theft decreases the quality of mobile communication service based on each subscriber, increases the operating cost according to the use of other service providers or land lines, and decreases the overall network efficiency due to the increase in system load. Economically, it is a huge damage factor.

In addition, due to illegal wireless theft, a normal subscriber may be uncomfortable using the service due to paying a fee for a service not used by him or a lack of confusion or call sensitivity, and in case of a subscriber who pays an unreasonable fee, Dissatisfaction with this will result in termination.

As described above, in order to detect illegal duplication that disadvantages normal subscribers and network service providers, the conventional network service provider uses a method of detecting illegal duplication of the mobile terminal by analyzing traffic patterns. .

In this case, a rule base method using rules that are common to most subscribers, and data mining that detect and compare current call usage types by informing usage information of mobile communication services of individual subscribers. Most of the theft detection and prevention systems adopt a rule-based method that can operate efficiently in terms of short processing time and small amount of information storage.

In the case of the rule-based method, it is determined that two mobile terminals having the same MIN are simultaneously called or received or a duplicate of the terminal when a registration, originating, or incoming procedure is attempted for a NIN currently providing service. The data mining method, also called a pattern recognition method, analyzes call data and determines that the subscriber call initiation pattern is a duplicate of the mobile terminal when the subscriber call initiation pattern is similar to the potential copy or is different from the previous call initiation pattern.

In the related art, U.S. Patent No. 5535265 stores the calling and incoming pattern information of a subscriber and judges that the mobile terminal is duplicated and used when an outgoing request of another subscriber having the same NIN occurs while the subscriber is incoming. do.

In general, the illegally duplicated mobile terminal cannot be detected by the method of verifying subscriber information because the subscriber number and the ESN are the same, so that a special authentication key is placed on the mobile terminal and the mobile terminal is reported to the AuC to authenticate the subscriber from the AuC. The method of obtaining is used.

As can be seen from the attached Figs. 1 and 2, the mobile terminal 1 with the authentication software is set to the BSC (2) and the authentication code set to itself in order to perform origination, incoming or location registration. When the authentication request is performed using the IS-41C MAP protocol or the IS-634A protocol defining an A-interface between the MSCs 3 (S10), the authentication request is transmitted to the MSC / VLR 3 through the BSC 2.

The MSC / VLR 3 detects the information on the mobile terminal 1 currently registered in the VLR and the subscriber information on the mobile terminal 1 registered in the HLR 4, and then the AuC 5. Upon requesting authentication from the side, the AuC 5 analyzes the authentication code for the mobile terminal 1 and determines whether the mobile terminal 1 is a normal subscriber (S20) (S30).

In the above analysis, if it is determined that the mobile terminal 1 requested for authentication is a mobile terminal normally registered, the AuC 5 allows the mobile terminal 1 to perform a normal call by allowing location registration and call setup. (S40) (S50), if it is determined that the authentication request by the mobile terminal that is not normally registered, that is, the illegally duplicated mobile terminal, AuC (5) rejects the location registration and call setting for the mobile terminal (S60).

As described above, the conventional method for detecting a stolen mobile terminal using an authentication technique sets an authentication code for each mobile terminal, thereby increasing the accuracy of authentication for the mobile terminal. Since the AuC must be provided as a component of the mobile communication network, an expensive cost is generated in the construction of the mobile communication network, and the location registration and call setup time for the mobile terminal moving to the service area takes a lot of time. There was a problem that the reliability is lowered.

In addition, although the originating, terminating, or location registration may be restricted for the duplicated mobile terminal as described above, it is difficult to detect a place where the duplicated terminal is located.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described general problems, and an object thereof is to compare the location registration information when different mobile terminals having the same mobile terminal number and ESN perform location registration in different service zones. It is to detect a mobile terminal that is illegally copied and used.

That is, illegally duplicated mobile terminals are detected by comparing final location registration information with new location registration information of the mobile terminal.

1 is a schematic configuration diagram of a general mobile communication network.

2 is a flowchart of an embodiment of performing authentication of a mobile terminal in a conventional mobile communication network.

3 is a diagram showing a service area relationship of a mobile communication network having a cell structure;

4 is a schematic flowchart of detecting a duplicated mobile terminal when registering a location of an illegally duplicated mobile terminal in the present invention.

5 is a flowchart for detecting an illegally copied mobile terminal through comparison of location registration information in the present invention.

The present invention for achieving the above object is a process for transmitting information on the subscriber to the HLR side when the location registration request of the mobile terminal having a predetermined subscriber number and ESN to the VLR that manages any service area is detected. After receiving the subscriber information registered with the location, the HLR requests the location registration cancellation to the VLR which finally registers the mobile terminal, and receives the final location registration information of the mobile terminal included in the cancellation response message. Including the corresponding information in the location registration response message and transmitting the current location registration to the VLR side, and the VLR performing the current location registration compares the current location registration information of the mobile terminal with the final location registration information received from the HLR. Determining whether a location registration of the duplicated mobile terminal is performed; And if it is determined that the location registration is performed, setting up an abnormal location registration to the current VLR, and if a call request of the duplicated mobile terminal is detected, recording a call with the other party and notifying a normal subscriber. It features.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

When the mobile terminal registers its location, implicit location registration such as call origination, incoming call, or paging, periodic location registration by timer, location registration by movement of service area, location registration by power on / off of mobile terminal And mandatory location registration by the operator.

As described above, when the mobile terminal performs location registration for any reason, information such as location registration time and location for the mobile terminal exists in the VLR in the MSC. The location registration can be detected.

Therefore, in the present invention, the subscriber information is added to the HLR and the VLR so that the subscriber can recognize the service code manipulation, and the subscriber enters the service code (for example, * XX + SEND) to detect whether or not his / her number is illegally copied. If the HLR and VLR are illegally copied to the subscriber information of the mobile terminal to register the information for detection, and if the location registration is detected at the position determined to be abnormal by the MSC / VLR, the HLR and the VLR determine that the terminal is illegally copied. Notify the normal subscriber mobile terminal of the call record of the duplicated mobile terminal.

An operation relationship thereof will be described with reference to the relationship between the general mobile communication network of FIG. 1 and the service area of FIG. 3.

When a normally registered mobile terminal located in an arbitrary service area (A to F) is powered on / off or an incoming or outgoing call attempt is made, the location registration information of the mobile terminal is relayed by the BSC to correspond to the local area. It is applied to the MSC / VLR side which is in charge of general service of the service.

The MSC / VLR analyzes the subscriber information about the mobile terminal that is authorized to determine whether it is currently registered with the mobile station. If the MSC / VLR is not registered with the mobile station, the MSC / VLR reads the subscriber information of the mobile terminal from the HLR. You will register.

When the location information of the mobile terminal corresponding to the MSC / VLR that manages the service of the area where the mobile terminal is located is registered, the subscriber of the mobile terminal has a set function code including a password (for example, * XX If a function to detect illegally copied mobile terminal is selected by the input of + SEND), the MSC / VLR in charge of service of the region analyzes the authorized information through BSC relay and then applies it to HLR.

Therefore, the HLR further includes information for detecting the counterfeit terminal in the set subscriber information.

As described above, the mobile terminal in the normal registration state in which the detection function of the counterfeit terminal is set is located in the 'A' service area shown in FIG. 3, for example. If location registration from a mobile terminal with subscriber information is required, the MSC / VLR in charge of the 'E' service area registers the location to its VLR for the mobile terminal according to the location registration request required in its service area. The location registration information of the mobile terminal is transmitted to the HLR side.

At this time, the HLR sends a control command to the MSC / VLR side in charge of the 'A' service area to cancel the location registration information for the terminal according to the location registration information executed in the 'E' service area, and then 'A' According to the location registration cancellation confirmation message for the corresponding mobile terminal from the MSC / VLR of the service area, the location registration confirmation message is notified to the VLR side of the 'E' service area.

At this time, if the subscriber of the mobile terminal normally registered enters a service code (eg * XX + SEND) for detecting the illegally copied mobile terminal, the function for detecting the illegally copied mobile terminal is set and the HLR is 'E' service that reads the final location registration information about the mobile terminal from the VLR in charge of the 'A' service area, that is, the service area information, registration time and location registration method, and notifies the current location registration confirmation message. Send to the local VLR side.

The VLR of the 'E' service area receiving the final location registration information of the mobile terminal registered in the 'A' service area from the HLR compares the received location registration information with the current location registration information and checks whether the location registration has been performed normally. Determine whether or not.

The determination of whether or not the normal location registration is performed by detecting whether the current location registration is a location registration from an adjacent service area and whether or not the location is registered by power on / off of the mobile terminal. If the registered service area is not located close to the last location registered service area, or if the power-off does not occur in the last location registration or if the current location registration is caused by power-on, the VLR requests the current location registration. The detected mobile terminal is detected as an abnormal mobile terminal that is illegally copied.

As described above, if it is determined that the mobile terminal registered at the current location is a location registration by the illegally copied mobile terminal, the VLR of the 'E' service area that performs the location registration of the mobile terminal stores the abnormal location registration information. When the subscriber information is requested from a call processing block within the MSC / VLR governing the 'E' service area according to the outgoing call of the mobile terminal, i.e., a pirated mobile terminal, the VLR that manages the 'E' service area currently requests outgoing calls. The call processing block notifies that the mobile terminal to be illegally copied is a mobile terminal.

The call processing block is formed through a call mixer and a VMS in a three-way call state connecting a normally registered mobile terminal, an illegally copied mobile terminal, and a counterpart called by the illegally copied mobile terminal, and then the illegally copied mobile terminal. Records the contents of the call of the terminal and transmits the contents of the call to the mobile terminal registered by the normal subscriber.

In the case where the pirated mobile terminal registered in the VLR managing the 'E' service area moves from the 'E' service area to a service area of 'C' or 'D' and performs location registration, the 'E' 'The abnormal location registration information stored in the VLR managing the service area is sent to the location registration cancellation confirmation message so that the mobile terminal is reflected in the location registration in the new service area' C 'or' D 'moved by the corresponding mobile terminal.

If the registered mobile terminal moves to a new service area and registers a location, the information registered by the illegally copied mobile terminal in order to prevent the call contents of the normally registered mobile terminal from being recorded in the illegally copied mobile terminal And compares the current location registration information with the current location registration information and changes the abnormal location registration information to the normal location registration information.

Subsequently, after the registered subscriber has recorded the contents of the call made by the counterfeited mobile terminal, if the user selects to release the detection function of the counterfeit mobile terminal by inputting a function code using the mobile terminal, the corresponding mobile terminal The MSC / VLR of the area in charge of the service of the service notifies the HLR side of the information to release the detection function of the illegally copied mobile terminal.

In addition, even if the counterfeit terminal is first registered in a certain service area, a subscriber of a normal mobile terminal turns on its mobile terminal to perform location registration and input a detection function code of the counterfeit mobile terminal. When it is detected, the illegally copied mobile terminal can be detected.

An operation of detecting an illegally copied mobile terminal will be described with reference to FIG. 5.

The MSC / VLR in charge of the service area where the user is located, such as by turning on the power of a mobile terminal located in an arbitrary service area, periodic location registration by a timer, movement of the service area, or forced location registration by an operator. If the location registration is requested (S101), the VLR of the service area transmits the information of the mobile terminal which is currently requested to be registered to the location of the HLR where general information on the mobile terminal is set (S102).

The HLR, which has received the information on the mobile terminal that is currently registered for location, requests cancellation of location registration for the mobile terminal from the final VLR side which has been performing location registration for the mobile terminal for which location registration is requested (S103).

Subsequently, when the HLR receives the response to cancel the location registration and the final location registration information for the corresponding mobile terminal from the VLR requesting the location registration cancellation (S104), the response message for the location registration is sent to the VLR side requesting the current location registration. And the final location registration information for the mobile terminal (S105).

The VLR, which has received the final location registration information for the mobile terminal at the same time as the response message for the location registration from the HLR, compares the current location registration information with the final location registration information for the mobile terminal (S106). It is determined whether the performed location registration is location registration by moving from an adjacent service area or location registration by switching to power-on from the power-off state of the mobile terminal (S107).

If the information on the mobile terminal currently registered in the location is determined to be location registration due to movement in the adjacent service area according to the movement of the mobile terminal or location registration due to return to power on from the power off state of the mobile terminal, the VLR Determining that the current location registration is a normal location registration (S108) allows the MSC to switch the link for the normal incoming and outgoing calls to maintain a normal call (S109).

If it is determined in step S107 that the information on the mobile terminal currently registered in the location is not a location registration due to movement from an adjacent service area or the location registration by power recovery in the power-off state of the mobile terminal, abnormal location registration information. It is determined whether the state is set (S110).

If the above state is set to abnormal location registration information, the corresponding mobile terminal determines that the mobile terminal is registered by the normal subscriber, and performs normal location registration to the VLR (S108), and the abnormal location registration information is set. If not, the VLR determines that the mobile terminal that is currently registered is a mobile terminal that is illegally copying and using another subscriber's number and ESN, and sets information on it (S111). To provide.

Then, when the MSC detects a request for an outgoing call from an abnormal mobile terminal, the MSC connects the mobile terminal of the normal subscriber with the mobile terminal requesting the outgoing call and a counterpart to the outgoing call in a three-way call, and then displays the contents of the abnormal mobile terminal. After recording, the normal subscriber's mobile terminal is used to provide VMS service so that the normal subscriber can not perform the illegally stolen service by requesting the service provider to charge the service fee excessively or to have the illegally copied mobile terminal. give.

As described above, the present invention compares the final location registration information of the mobile terminal with the new location registration information currently required and detects the illegally copied mobile terminal, thereby determining whether or not to copy its own information by the subscriber's selection without management by the system operator. It can detect and reduce the service fee by eliminating the installation of authentication center for the detection of duplicate terminals, and increase the efficiency of the system by reducing the call setup time compared with the existing authentication method.

Claims (5)

Transmitting a corresponding subscriber information to the HLR when a location registration request of a mobile terminal having a predetermined subscriber number and ESN is detected in an MSC / VLR managing an arbitrary service area; After receiving the subscriber information, the HLR requests the position registration cancellation to the VLR which finally registers the mobile terminal, and then receives the final location registration information of the mobile terminal included in the cancellation response message. Transmitting the data to the VLR side for which the current location registration is required; The VLR performing the current location registration determines whether the location registration of the duplicated mobile terminal is compared by comparing the current location registration request information on the corresponding mobile terminal with the last location registration information received from the HLR; If it is determined that the location registration of the duplicated mobile terminal is performed, the VLR sets a current location registration request to an abnormal location registration; And if the originating call request of the duplicated mobile terminal is detected, recording the contents of the call with the other party and notifying the normal subscriber. The method according to claim 1, The final location registration information included in the location registration deletion response message includes information about a service area, a final location registration time, and a location registration method. The method according to claim 1, And determining whether or not the location-registered mobile terminal is duplicated based on whether the location registration is a location registration by moving from an adjacent service area. The method according to claim 1, And determining whether the location-registered mobile terminal has been duplicated by determining whether the location-registered mobile terminal is a location registration by restoring power after power off. The method according to claim 1, If it is determined that the abnormal information registered in the current VLR is the location registration by the normal subscriber, the duplicated terminal detection method for registering the abnormal location registration information as normal to maintain a normal call service.