KR100257809B1 - A prevention method from wiretap by duplication of mobile station in cdma/analog dual mode mobile station - Google Patents

Abstract

PURPOSE: A method for preventing a wiretapping according to a replication of a terminal is provided to prevent the wiretapping by using a location registration. CONSTITUTION: When a replicated terminal and an original terminal are in an area of the same base station, a turn-on time, a call time, and a shift time of each of two terminals are different each other. At this time, the shift time means a time when each of two terminals shifts into the area of the base station. Times of time-based location registration in two terminals are different each other. When the locations of the terminals are registered at the base station for a fixed time, a mobile communication system recognizes that one of two terminals is replicated by testing an interval of the time-based location registration. Firstly, the mobile communication system confirms that there is a time-based location registration or not. If there is the time-based location registration, the mobile communication system confirms that there is the next time-based location registration or not. When there is the next time-based location registration, the mobile communication system calculates a time interval of the time-based location registration and the next time-based location registration. After this, the mobile communication system compares the time interval with a set-up time. When the time interval is shorter than the set-up time, the mobile communication system recognizes that there is the replicated terminal.

Description

Interception Prevention Method by Terminal Cloning in Code Division Multiple Access Analog Dual Mode Terminal

The present invention relates to a method for preventing eavesdropping due to terminal duplication in a code division multiple access (CDMA) analog duplex mode terminal.

In general, various means are currently used for personal communication with each other. Among them, the portable terminal having the structure as shown in the system diagram of FIG. 1 is one of the most convenient and common methods. On the other hand, the portable terminal is also evolving from an analog mobile phone to a digital mobile phone in order to improve better quality and better frequency efficiency. On the other hand, as mobile communication becomes more common, terminal duplication, eavesdropping and eavesdropping are becoming more problematic, and therefore, a means for preventing terminal duplication, eavesdropping and eavesdropping is needed.

In the related art, an analog mobile phone has almost no means for preventing terminal duplication, eavesdropping, and eavesdropping. In the case of a digital mobile phone using a code division multiple access (CDMA) scheme, terminal duplication, eavesdropping, and eavesdropping are prevented. For each terminal to manage individual information.

By the way, in the conventional means, in the case of an analog mobile phone, it is possible to eavesdrop other people's calls with a simple device using a signal of the air without a specific terminal information, or to extract information of the terminal and use it for duplication. The cloned terminal may be used to illegally use the terminal, and in the case of a digital mobile telephone using a code division multiple access (CDMA) method, it is almost impossible to eavesdrop using a signal of an airwave, but information about a specific terminal is not available. In the case of the terminal duplication by using the system, the system recognizes the same terminal and transmits a message to make illegal calls through the duplicated terminal.If the two duplicated terminals exist in a distant region, the system registers and uses the two terminals. Replication of two terminals using data A, but can determine, the two terminals in the same base station, it is difficult to separate by using the correlation between time and distance in accordance with use of the terminal, there is a problem that enable the illegal use and illegal eavesdropping by a clone terminal using it.

The present invention has been made to solve the above problems, and to provide a method for preventing eavesdropping by terminal duplication in a code division multiple access analog dual mode terminal capable of preventing terminal duplication, eavesdropping and eavesdropping using location registration. will be.

1 is a system diagram of a general mobile terminal

2 is a flowchart showing an algorithm of the interception prevention method of the present invention.

<Description of the symbols for the main parts of the drawings>

1: RF (Radio Frequency) / Analog Circuit

2: Digital signal processing circuit

3: Micom Department

4: Display

5: Key input unit

6: Memory section

In order to achieve the above object, the present invention basically recognizes the counter value according to the time of powering on the two terminals existing in the same base station, the time of talk, or the time of moving to the current region and the system, and registering the time reference location. In principle, if the time-based location registration occurs within the time specified by the system by checking the time interval, it is determined as a duplicated terminal.

In the present invention, after initializing as shown in the flowchart of FIG. 2, it is checked whether there is a time-based location registration, and when the time-based location is registered, the next time-based location registration is checked. When the time-based location registration is confirmed, the time interval from the time-based location registration immediately before is calculated and compared with the preset time in the system. As a result of the comparison, if the time-based location registration occurs within a time shorter than the set time, it is determined by the duplication terminal. If the location registration is made within the appropriate time, the counter is initialized and then returned to the routine for checking the time-based location registration. It is composed.

Here, the location registration will be described. The public land mobile communication network is divided into a plurality of location areas, and each location area is assigned a unique identification number. Since the base station always sends the identification number, the mobile station knows which location area it belongs to and performs location registration depending on the situation. The location registration of the mobile station refers to a procedure in which the mobile station informs the base station of its location-related information and features, and the land network receives the information and stores and updates the information in a database (HLR, VLR) as necessary. The main purpose of the location registration is to effectively use a radio channel that is frequently used for call generation and call forwarding of mobile station outgoing or incoming calls.

The mobile communication system uses location registration to reduce the load of the calling and access channels. In the case of a system without any type of location registration, the mobile station cannot know where the mobile station is currently receiving a call. This calls for all base stations in the system, which increases the load on the calling channel. Therefore, to obtain the optimum efficiency, parameters such as the size of the cellular system, the mobile line prediction of the mobile stations in the system, call transfer statistics, and the like are considered.

On the other hand, code division multiple access (CDMA) mobile telephone systems currently use various types of location registration as shown in Table 1 below.

Registration type Registration message Explanation Remarks Power-up Registration Registration Msg. Terminal On Power-down Registration Registration Msg. When terminal is off Timer-based Registration Registration Msg. After a certain time Distance-based Registration Registration Msg. When moving over a certain distance Zone-based Registration Registration Msg. When area changes Parameter-change Registration Registration Msg. When parameter changes Ordered Registration Mobile Station Order When registering command of base station Implicit Registration Origination Msg.Page Response Msg. When sending / receiving Traffic Registration Mobile Station Registered Msg. Busy registration

In particular, the time-based registration (Timer-based Registration) is the terminal to register the location at regular intervals. Thus, the system can be used to automatically release location registration for a terminal that has not successfully performed power-down registration. The time-based location registration has a counter (REG_COUNT) in the terminal itself, and increases by one every 80 ms. When the value reaches the value set by the system, the counter is reset to zero, position registration is performed, and the counter is incremented again. The counter is reset when the power is turned on, when switching to another system, and even after each location registration is successfully performed.

When the terminal is powered on and when the call is over, the counter is set to a random value generated according to the system time.

Hereinafter, the operation of the present invention having the configuration as described above.

First, if two duplicated terminals exist in the same base station, the time for turning on each terminal, calling time, or moving time to the current region and system is different. Therefore, since the counter value of each terminal is different, the time-based location registration time is different. If the time-based location registration occurs within the time specified by the system by checking the time-based location registration interval using this, one of the two terminals can be considered as a duplicated terminal. 2 is an algorithm of terminal duplication verification using time-based location registration.

Initialize first and check if there is time-based location registration. Once the time-based location registration, the next time-based location registration is confirmed. When the time-based location registration is confirmed, the time interval from when registering the time-based location immediately before it is calculated. Compare with the time set by the system. If time-based location registration occurs in a time shorter than the predetermined time, it is determined by the duplication terminal. If location registration is done within a reasonable time, go to the routine to initialize the counter and confirm the time-based location registration.

Therefore, according to the present invention, it is possible to prevent terminal duplication, eavesdropping, and eavesdropping, thereby protecting personal privacy and preventing leakage of personal information, thereby enhancing the level of security and greatly contributing to the expansion of mobile communication. By some applications, there is a very significant effect of tracking criminals such as terminal duplication, eavesdropping and interception.

Claims (1)

In a method for preventing eavesdropping due to duplication of a terminal in a code division multiple access analog duplex terminal, after initializing, checking whether there is a time-based location registration, and then registering the next time-based location When the registration of the time-based location is confirmed, the time-based location registration is checked, and a time interval between the time-based location registration immediately before the registration is calculated and compared with the preset time in the system. As a result of the comparison, the time is shorter than the set time. Code division multiple access analog duplex characterized in that it is determined by the duplication terminal when the reference location registration has occurred, and if the location registration is made within an appropriate time, the counter is initialized and then returned to the routine for checking the time reference location registration. Prevention of Eavesdropping by Terminal Cloning in Mode Terminal method

Images