KR20070060717A - Method for preventing illegal use of a terminal in a mobile communication system - Google Patents

Abstract

A method for preventing the unauthorized use of a terminal in a mobile communication system is provided to solve a problem that a lost terminal is registered to a different mobile communication provider that supports the same frequency band as that of a mobile communication provider to which the terminal belongs. A base station transmits messages for initializing traffic for a terminal that requests use registration to the terminal(310). The terminal transmits a preamble message to the base station in response(320). The base station transmits a BS ACK indicating that traffic has been initialized(330). The base station transmits a message for identifying a service provider(Maintenance Identification Order) to the terminal(340). The terminal compares a service provider identification code included in the message and a previously stored provider identification code, and if they are not identical, the terminal transitions to a lock state and informs a user that the terminal cannot be registered to the base station(345). The terminal transmits a release message(Release Order) requesting a connection termination(350). The base station transmits a response message to the release message(360). The base station discards a registration request message from the terminal and terminates its connection with the terminal(365).

Description

Method for preventing illegal use of a terminal in a mobile communication system}

1 is a schematic diagram of a mobile communication system according to an embodiment of the present invention;

2 is a diagram illustrating a usage registration procedure between a base station and a terminal through carrier identification according to an embodiment of the present invention.

3 is a diagram illustrating an operation between a base station and a terminal when a provider identification code does not match according to an embodiment of the present invention.

4 is a diagram illustrating an operation between a general base station not applying a service provider identification code processing procedure and a terminal to which a service provider identification code processing method is applied according to an embodiment of the present invention.

The present invention relates to a method for preventing illegal use of a terminal in a mobile communication system.

The first generation mobile communication system of the advanced mobile phone systems using the analog modulation method and the 800 MHz frequency band could not meet the rapidly increasing demand of mobile subscribers due to the limitations in the use of frequency. . Thus, the second generation of mobile communication has emerged as an alternative. The second generation mobile communication typically uses a code division multiple access (CDMA) scheme and a global system for mobile communications (GSM) scheme. For example. The CDMA method was developed by Qualcommn, Inc., which uses the same frequency in multiple cells, so that interference is low and signal transmission is stopped while the caller is silent. There is an advantage that can be increased over. In addition, the CDMA method has a feature of supporting the IS-95 standard and a soft handoff function. On the other hand, the GSM scheme is a pan-Europe standard scheme and uses a time division multiple access scheme and operates in the 900 MHz band.

However, since the second generation mobile communication system that cannot provide multimedia services due to the low data rate cannot satisfy user's needs, the third generation mobile communication system has been discussed. The third generation mobile communication system supports high quality voice and data, video, and even multimedia services. The third generation mobile communication system, which uses a total of 230 MHz (1885-2024 MHz, 2100-2200 MHz) in the 2 GHz band, also called IMT-2000, is a 3GPP2 (3rd Generation Partnership Project) North American-based synchronous scheme and 3GPP (3rd). Genaration Partnership Project can be divided into European asynchronous methods. An example of the synchronous mobile communication system is a CDMA2000 mobile communication system, which receives time information from satellites at all base stations and adjusts the time to the same, thereby enabling real-time call regardless of user location. That's the way. An example of the asynchronous mobile communication system is a W-CDMA mobile communication system, which induces real-time calls to a separate chip device without using a satellite. Following the 3rd generation mobile communication system, with the development of communication technology, according to the user's demand such as performance improvement and convenient service, it is continuously developing to the 3.5 generation mobile communication system and the 4th generation mobile communication system.

On the other hand, as the mobile communication terminal became popular in the mobile communication technology developed as described above, the demand of the mobile communication terminal has rapidly increased, and it is often used incorrectly by exploiting it. For example, a rental terminal, a tourist rental terminal, a lost or stolen terminal, etc., distributed by a mobile communication provider may be illegally registered and used by another mobile communication provider. This is because when there is at least one mobile communication provider using the same frequency band and the illegal terminal is registered with another mobile communication provider of the same frequency band which does not have information on the illegal terminal, it can be registered and used without problem. to be. For example, Korea is currently a mobile carrier using transmission and reception frequency bands of 1750 ~ 1780 MHz and 1840 ~ 1870 MHz. Katie Freetel (hereinafter referred to as "KTF") and LG Telecom (hereinafter referred to as "LGT") There is this. If a lost terminal of the KTF is registered for use with the KTF, its use will not be allowed because it is a lost terminal. However, if the lost terminal is to be registered and used in the LGT, the LGT may be registered and used because the terminal does not have information that the terminal is lost. Therefore, a problem arises that the terminal which should not be used may be used by other mobile communication providers supporting the same frequency band.

Accordingly, the present invention provides a method for preventing the illegal use of the mobile communication terminal.

According to an aspect of the preferred embodiment of the present invention, a terminal that is subscribed to a first mobile communication network that provides a service in a predetermined frequency band as a first communication provider and stores identifier information of the first mobile communication network is the first. A method for preventing illegal registration and use in a second mobile communication network providing a service in the predetermined frequency band as a second communication service provider different from a communication service provider requires the terminal to register with a base station of the second mobile communication network. And providing, by the base station, the identifier information of the second mobile communication network to the terminal together with the response to the registration request of the terminal, and by the terminal, the identifier information provided from the base station and the identifier information stored in the terminal. And comparing the identifier information with each other Case, the process of the base station the mobile subscriber station transmits a message for requesting termination of the connection with the terminal to the base station, and includes the step of terminating the connection with the terminal.

According to another aspect of the preferred embodiment of the present invention, a terminal that is subscribed to a first mobile communication network providing a service in a predetermined frequency band as a first communication provider and stores identifier information of the first mobile communication network is the first. A method for preventing an illegal registration and use of a second mobile communication network that provides a service in the predetermined frequency band as a second communication service provider different from a communication service provider includes: registering the terminal as a base station of the second mobile communication network. Requesting, providing a call processing start request message to the terminal along with a response to the registration request from the terminal, and transmitting a message requesting the terminal to terminate the connection with the terminal. And the base station terminates the connection with the terminal. The.

The foregoing has outlined rather broadly the features and technical advantages of the present invention in order that those skilled in the art may better understand the detailed description of the invention that follows.

The foregoing has outlined rather broadly the features and technical advantages of the present invention in order that those skilled in the art may better understand it from the following detailed description of the invention. In addition to these features and advantages, further features and advantages of the present invention which form the subject of the claims of the present invention will be better understood from the following detailed description of the invention.

DETAILED DESCRIPTION A detailed description of preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art will recognize that the disclosed concept and specific embodiments of the invention described below may be changed or modified to achieve the technical problem to be achieved by the present invention. Those skilled in the art will also recognize that concepts and structures equivalent to the concepts and structures disclosed herein do not depart from the spirit and scope of the broadest form of the invention. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

1 is a schematic diagram of a mobile communication system according to an embodiment of the present invention. The present invention prevents illegal use of the terminal through the operation of transmitting and receiving the operator identification code between the terminal and the base station controlled by the operation center.

Referring to FIG. 1, when a user of the terminal 110 requests registration for use of the terminal 110, the base station 120 receives the request. The base station 120 receives the request from the terminal 110 and transmits the request to a mobile switching center (hereinafter referred to as "MSC") 130. The MSC 130 functions as a central control to process signals received and received by each base station and to adjust the base stations to be efficiently operated. In particular, the MSC 130 inquires the operation center 140 to confirm the information of the terminal 110 and the user information of the terminal 110 before sending a response to the registration request of the terminal 110. do. The operation center 140 is a server operated by a mobile communication service provider, and has a unique service provider identification code for identifying the mobile communication service provider. The operator identification code is a code for identifying whether the terminal is registered and can be used in the mobile communication service provider subscribed to the mobile communication network. The terminal embeds an identification code of the mobile communication service provider which can be used, and the base station or the operation center provided by the mobile communication service service provider also stores the identification code of the mobile communication service provider. By comparing the identification code stored in the terminal and the identification code stored in the base station or the operation center, it is possible to determine whether the terminal can be registered with the mobile communication service provider. If the terminal requests registration to a base station or an operation center that does not store the identification code, the terminal cannot be registered and used in the mobile communication provider because the identification codes are not compared. Therefore, by comparing the operator identification codes, it is possible to prevent the problem that the terminal is registered illegally used in other mobile communication providers.

The MSC 130 sends the mobile operator identification code to the mobile station through the base station 120 before sending a response to the registration request of the terminal 110 using the information received from the operation center 140. Transmit to 110. The MSC 130 inquires of a Home Location Register (HLR) 150 that stores information of the terminal 110 to confirm the information of the terminal 110. If necessary, the operation center 140 may also inquire the HLR 150 about the terminal.

When the MSC 130 receives the response to the identification code from the terminal 110, the MSC 130 refers to the information inquired by the HLR 150 to be registered with the mobile service provider to receive the service. Here, the response to the identification code includes information that the operator identification code received by the terminal 110 and the operator identification code embedded in the terminal 110 match. However, if the MSC 130 receives a response that does not match the operator identification code from the terminal 110, it is determined that the terminal 110 is illegally used terminal and registration of the terminal 110 Reject. Therefore, the terminal that does not match the operator identification code is not registered in the mobile communication provider and can not receive the service, it is possible to prevent the problem that the terminal is illegally used.

For example, a second communication terminal that is subscribed to a first mobile communication network providing a service in a predetermined frequency band as a first communication service provider and stores identifier information of the first mobile communication network is different from the first communication service provider. When a user attempts to illegally register a second mobile communication network that provides a service in the predetermined frequency band, the terminal may not be registered with the second communication provider and may be rejected.

2 is a diagram illustrating a usage registration procedure between a base station and a terminal through identification of a carrier according to an embodiment of the present invention. The base station in the figure and the description to be described later is a process before the terminal 110 is transmitted to the terminal 110 through the operations of the MSC 130, the operation center 140, the HLR 150 of FIG. It will be described as being made between the base station and the terminal 110, which is a previous step of communicating with). Therefore, all operations to be described below should not be understood as operations performed only between the base station and the terminal.

Referring to FIG. 2, in step 210, the base station transmits messages for initializing traffic for the terminal requesting usage registration, for example, a preamble and null traffic data, to the terminal. In step 220, the terminal transmits a preamble message to the base station in response to the initialization message. In step 230, the base station transmits a base station acknowledgment message " Base Station Acknowledge " (hereinafter referred to as "BS ACK") to the terminal indicating that the preamble message has been received and the traffic has been initialized. In step 240, the base station transmits a message " Maintenance Identification Order " The " Maintenance Identification Order " includes a provider identification code. The provider identification code is an identifier for confirming whether a terminal can be registered with a mobile communication provider to which the base station belongs. In step 250, the terminal compares the operator identification code included in the "Maintenance Identification Order" with the operator identification code previously stored in the terminal. In addition, in step 250, if the operator identification codes coincide with each other, a terminal acknowledgment message "Mobile Station Acknowledge" (hereinafter referred to as "MS ACK") is transmitted to the base station. Receiving the MS ACK from the terminal means that the operator identification code stored in the terminal and the operator identification code received from the base station match. In step 260, the base station transmits a message "Service Connect Message" (hereinafter referred to as "SCM") requesting the start of call processing to the terminal. When the SCM is received, preparation for call processing between the base station and the terminal is completed. That is, the base station registers the terminal to perform call processing.

Then, the case in which the operator identification code included in the "Maintenance Identification Order" received from the base station does not match the operator identification code pre-stored in the terminal will be described.

3 is a diagram illustrating an operation between a base station and a terminal when a provider identification code does not match according to an embodiment of the present invention. The base station in the figure and the description to be described later is a process before the terminal 110 is transmitted to the terminal 110 through the operations of the MSC 130, the operation center 140, the HLR 150 of FIG. It will be described as being made between the base station and the terminal 110, which is a previous step of communicating with). Therefore, all operations to be described below should not be understood as operations performed only between the base station and the terminal.

Referring to FIG. 3, in step 310, the base station transmits messages for initializing traffic for the terminal requesting usage registration, for example, a preamble and null traffic data, to the terminal. In step 320, the terminal transmits a preamble message to the base station in response to the initialization message. In step 330, the base station receives the preamble message and transmits a BS ACK to the terminal indicating that the traffic has been initialized. In step 340, the base station transmits a message for identifying a service provider, "Maintenance Identification Order" to the terminal. The " Maintenance Identification Order " includes a provider identification code. The provider identification code is an identifier for confirming whether a terminal can be registered with a mobile communication provider to which the base station belongs. The terminal compares the operator identification code included in the "Maintenance Identification Order" with the operator identification code previously stored in the terminal. If the operator identification codes do not match with each other in the comparison result, the terminal transitions to the locked state in step 345, and informs the user of the terminal that the terminal cannot be registered with the base station. In step 350, the terminal transmits a release message "Release Order" for requesting termination of the connection. The locked state means a state in which the terminal no longer requests a registration to the base station. The base station receiving the release message from the terminal in step 360 transmits a response message "Release Response" for the release message. In step 365, the base station discards the registration request message from the terminal and terminates the connection with the terminal.

4 is a diagram illustrating an operation between a general base station not applying a provider identification code processing procedure and a terminal to which a provider identification code processing method is applied according to an embodiment of the present invention. The base station in the figure and the description to be described later is a process before the terminal 110 is transmitted to the terminal 110 through the operations of the MSC 130, the operation center 140, the HLR 150 of FIG. It will be described as being made between the base station and the terminal 110, which is just before the communication with the terminal. Therefore, all operations to be described below should not be understood as operations performed only between the base station and the terminal.

Referring to FIG. 4, in step 410, the general base station transmits messages for initializing traffic for the terminal requesting usage registration, for example, a preamble, null traffic data, to the terminal. do. In step 420, the terminal transmits a preamble message to the general base station in response to the initialization message. In step 430, the general base station receives the preamble message and transmits a BS ACK indicating that the traffic is initialized. However, since the general base station is a base station that does not perform the operator identification code processing procedure, it does not transmit a message including the operator identification code to the terminal. Therefore, in step 440, the general base station transmits an SCM, which is a message for requesting to start call processing, instead of a message including the authentication code. On the other hand, since the terminal is a terminal that performs the operator identification code processing procedure, it is expected to receive a message including the operator identification code from the base station. However, since a message for requesting to start call processing is received without receiving the message including the service provider identification code, the terminal transitions to a locked state and indicates that the user of the terminal cannot register in step 445. In step 450, the terminal transmits a release message "Release Order" for requesting termination of the connection to the general base station. The reason why the terminal transmits the release message is that according to the operator identification code processing procedure, after receiving the BS ACK, the terminal should receive a message including the operator identification code from the base station. This is because it is received. In step 460, the general base station transmits a response message "Release Response" to the release message to the terminal. In step 465, the base station discards the registration request message from the terminal and terminates the connection with the terminal.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. For example, as the message for identifying the business operator, the "Maintenance Identification Order" is taken as an example, but other messages such as a data burst message "Data Burst Message" may also be used. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by those equivalent to the scope of the claims.

As described above, the present invention prevents registration to other mobile communication providers other than the mobile communication service provider to which the terminal belongs through the service provider identification code comparison procedure. There is an advantage to prevent.

Claims (4)

A terminal that is subscribed to a first mobile communication network providing a service in a predetermined frequency band as a first communication service provider and stores identifier information of the first mobile communication network is determined as a second communication service provider different from the first communication service provider. In the method for preventing illegal registration and use in a second mobile communication network providing a service in a frequency band, Requesting the terminal to register with a base station of the second mobile communication network; Providing, by the base station, identifier information of the second mobile communication network to the terminal together with a response to the registration request; Comparing, by the terminal, the identifier information provided from the base station and the stored identifier information; Transmitting, by the terminal, a message for requesting termination of connection with the terminal when the identifier information does not match each other; And terminating the connection with the terminal in response to the base station in response to the message for requesting termination of the connection. The method of claim 1, further comprising: when the identifier information does not match with each other, the terminal transitions the state of the terminal to the locked state and externally indicates that the terminal is not registered. Way. A terminal that is subscribed to a first mobile communication network providing a service in a predetermined frequency band as a first communication service provider and stores identifier information of the first mobile communication network is determined as a second communication service provider different from the first communication service provider. In the method for preventing illegal registration and use in a second mobile communication network providing a service in a frequency band, Requesting the terminal to register with a base station of the second mobile communication network; Providing, by the base station with a response to the registration request, a call processing initiation request message to the terminal; Transmitting, by the terminal, a message for requesting termination of connection with the terminal to the base station; And the base station comprises the step of terminating the connection with the terminal. The method of claim 1, further comprising: when the identifier information does not match with each other, the terminal transitions the state of the terminal to the locked state and externally indicates that the terminal is not registered. Way.

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