JPH06164493A - Mobile communication system - Google Patents

Abstract

PURPOSE:To prevent illegal use of mobile devices and networks by copying the identification information of the mobile device and to prevent the disadvantages and social disorder of an autorized user and system user by having common information which changes whenever the communication be tween the mobile device and the network is performed and confirming the information at every communication. CONSTITUTION:A code request is sent from an exchange 230 for an originating request from a mobile device 100. The mobile device 100 which receives the code request sends a code A (identification code) stored in the former communication. The exchange 230 compares the code A stored in the former communication within the subscriber data of the mobile device 100 with the code from the mobile device 100 and permits the communication at the time of coincidence. The exchange 230 sends a new code B. The mobile device 100 updates the stored code A to a code B (identification code) and notifies the end of processing (the end of storage) to the exchange 230. The exchange 230 which receives the storage end rewrites the code A within the subscriber data of the mobile device 100 to the code B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a system in which a base station connected to a communication network and a large number of mobile units perform wireless communication. Used for mobile communication terminal authentication method of mobile communication method.
The present invention is used to prevent unauthorized use of mobile communication terminals.

[0002]

2. Description of the Related Art In a mobile communication system, since wireless terminals are used and terminals move, the identification information of the mobile device is stored in the mobile device, and therefore the security of the identification information is important. Once the identification information is stolen, a legitimate user or system operator is economically disadvantaged.

Conventionally, in the mobile communication system, there has been a method of increasing the confidentiality of communication information in the wireless section by encrypting communication in the wireless section.

Further, in the case of a duplicate mobile device which is illegally used by stealing its identification information from the mobile device itself, there are the following preventive measures. By scrambling the storage method and the reading format, it is difficult to read the number. The exchange detects the position and warns that it is outside the range that can be moved within the time. The switch detects a sudden increase in usage frequency.

[0005]

However, in such a conventional mobile communication system, the cost of a countermeasure against a duplicate mobile device that is illegally used by stealing its identification information from the mobile device itself is too expensive. However, there was a problem that it was not possible to distinguish whether or not it was actually used, and there was no appropriate method.

The present invention solves the above problems.
Provides a mobile communication method that can prevent illegal use of mobile devices and networks by duplicating mobile device identification information and prevent disadvantages to legitimate users and system operators and social confusion. The purpose is to do.

[0007]

The present invention comprises a plurality of base stations connected to a communication network and a large number of mobile units connected to the base stations via wireless lines. A storage means for holding the assigned unique identification information is provided,
In a mobile communication system having a memory means for holding identification information of the mobile device in the network, the storage means includes a storage area for storing an identification code separately from the identification information, and the memory means includes the identification information. An identification code for the mobile device when the identification information added to the transmission request from the mobile device is appropriate in the network. And a means for transmitting the identification code stored in the storage area based on the transmission request for the identification code, and transmitting the identification code to the network. The stored identification code is compared with the identification code stored in the storage area, and when they match, communication is permitted, and a new identification code different from the stored identification code is generated and transmitted. The mobile device includes means for storing a new identification code transmitted instead of the identification code stored in its storage area and transmitting a storage completion notification to the network. And a means for replacing the identification code stored in the area with a new identification code based on the storage completion notification.

Further, according to the present invention, the network may include means for transmitting the identification code transmission request again and confirming it when the storage completion notification cannot be received from the mobile device.

[0009]

When the transmission request is issued from the mobile unit, the network requests the mobile unit to transmit the stored identification code when the identification information is appropriate, and the mobile unit identifies the stored identification. Code is transmitted, the network permits communication if it matches the stored identification code, a new identification code different from the previous one is generated and transmitted to the mobile unit, and the mobile unit uses the new identification code. The code is stored, a storage completion notification is transmitted, and the network stores a new identification code. That is, the identification code of the mobile device is retained by holding a matching identification code between the network and the mobile device, updating this with a new identification code each time communication is performed, and confirming with this identification code. It is possible to prevent illegal use of mobile devices and networks, and prevent disadvantages of legitimate users and system operators and social confusion.

[0010] Further, when the network cannot receive the storage completion notification from the mobile device, the network has not received the new identification code, or the new identification code has been received by the mobile device. Assuming that the identification code of the machine has been updated but the confirmation signal cannot be received on the network, the previous or new identification code is transmitted again to confirm.

[0011]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a mobile communication system according to an embodiment of the present invention.

In FIG. 1, the mobile communication system uses a base station 2 as a plurality of base stations connected to a network 200 as a communication network.
20 and a mobile station 100 as a number of mobile stations connected to the base station 220 via a wireless line.
Is provided with a mobile device storage data memory 120 as a storage unit for storing the assigned unique identification information.
The exchange 230 is provided with a subscriber memory 240 as memory means for holding the identification information of the mobile unit 100, the base station 220 includes an antenna 210, a radio unit 221, and a control unit 222, and the mobile unit 100 has a telephone 111. Modulator 112, transmitter 113, duplexer 114, antenna 1
15, a receiver 116, a demodulator 117, a control unit 118 and a frequency synthesizer, and the control unit 118 further includes a mobile device stored data processing unit 119.

A feature of the present invention is that the mobile device storage data memory 120 includes a storage area for storing an identification code separately from the identification information, and the subscriber memory 2
Reference numeral 40 includes a storage area for storing the identification code in association with the identification information.
0 is provided with means for transmitting an identification code transmission request to the mobile device 100 when the identification information added to the transmission request is correct, and the mobile device 100 is based on the identification code transmission request. The exchange 230 comprises means for reading and transmitting the identification code stored in the storage area, and the exchange 230 compares the transmitted identification code with the identification code stored in the storage area, and when they match. The mobile device 10 includes means for permitting communication and generating and transmitting a new identification code different from the stored identification code.
0 is provided with means for storing a new identification code transmitted instead of the identification code stored in the storage area and transmitting a storage completion notice to the exchange 230. Based on the above, there is provided a means for replacing the identification code stored in the storage area with a new identification code.

Further, more specifically, the means for transmitting data from the mobile device 100 are a control unit 118, a mobile device stored data processing unit 119,
It is included in the modulator 112, the duplexer 114, the antenna 115, and the frequency synthesizer 121.

Further, the exchange 230 includes means for transmitting and confirming the transmission request of the identification code again when the storage completion notice cannot be received from the mobile station 100.

The operation of the mobile communication system having such a configuration will be described.

FIG. 2 is an explanatory diagram of a signal sequence and processing between a mobile station and a network (exchange) in a state where the mobile communication system of the present invention is not illegal. FIG. 3 is an explanatory diagram of a signal sequence and processing between the mobile unit and the network (switch) when "storage completion" indicating the completion of processing of the mobile communication system of the present invention cannot be received by the network. FIG. 4 is an explanatory diagram of a signal sequence and processing between a mobile device and a network (switch) when an unauthorized mobile device is used due to an illegal copy of the mobile communication system of the present invention.

FIG. 2 shows the processing at the normal time, in which the mobile unit 100
A code request (request for transmitting an identification code) is transmitted from the exchange 230 in response to a call request from the switch. Upon receiving the code request, the mobile device 100 transmits the code A (identification code) stored in the previous communication. The exchange 230 compares the code A stored in the previous communication in the subscriber data of the mobile station 100 with the code from the mobile station 100, and permits the communication if they match. Further, when the codes match, the exchange 230 transmits a new code B (identification code), the mobile device 100 updates the stored code A to the code B, and the exchange is notified that the processing is completed (storage completion). Notify 230. Upon receipt of the storage completion, the exchange 230 rewrites the code A in the subscriber data of the mobile station 100 with the code B.

Here, the identification code is composed of, for example, an 8-bit numerical value, and the ordinal number is moved up by 1 for use. It is assumed that the exchange 230 and the mobile device 100 store the code A (for example, “00000010”) in the subscriber memory 240 and the mobile device storage data memory 120, respectively. The exchange 230 requests transmission of the code A in response to the call request from the mobile device 100, and the mobile device 100 reads the code A from the mobile device storage data memory 120 and transmits it. Since the exchange 230 matches the code A stored in the exchange 230, it permits communication, adds “1” to the code A, and transmits the code B (“00000011”) to the mobile device 100. The mobile device 100 stores the code B in the mobile device storage data memory 120 in place of the code A, and transmits a notification of “storage completion”. The exchange 230 receives the "storage completion", confirms that the code B is stored, and confirms that the subscriber memory 240
The code B is stored in. The ordinal number may be increased by n bits, and if 8 bits are changed to 32 bits and a random number generated by a random number generator is used, security can be further enhanced.

FIG. 3 shows the processing when the "storage completion" indicating that the processing has been completed cannot be received. The processing is performed when "the new code B transmitted from the exchange 230 is not received" and when "new storage" is not received. The code is received by the mobile device 100,
The code of the mobile device 100 has been updated, but it is described separately in the case where "the storage completion" cannot be received by the exchange 230 ".

The exchange 230 "transmits the code request again when the storage completion reception waiting time-out occurs, requests the mobile station 100 to transmit the storage code, and in the case of retransmission, the code A before update or the code B after update is sent. In either case, the network side 200 determines that the mobile device 100 is legitimate and sends the update code B. When the mobile device 100 retransmits, the code B is updated again even if the code B has already been updated. When the storage is completed, the mobile device 100 sends “storage completion” to the exchange 230, and the exchange 230 rewrites the code A in the subscriber code of the mobile device 100 to the code B.

By carrying out such a processing, it is possible to take measures against an unauthorized mobile device as shown in FIG. 4 at an early stage.

As shown in FIG. 4, when an unauthorized mobile device in which the code of the authorized mobile device is copied is used, when the unauthorized mobile device communicates, it is rewritten with the code B of the subscriber data of the exchange 230. To be In this state, when a legitimate mobile station originates a call, the legitimate mobile station returns a code A in response to a code request from the exchange 230 and does not match the code B of the exchange 230, and the legitimate mobile station cannot communicate. Becomes This allows a legitimate mobile user to know that there is an illicit person using his number, contact the system operator, and disable that number, which can be an economic blow. Can be avoided.

[0024]

As described above, the present invention has common information that changes each time a mobile station communicates with a network, and confirms this information each time it communicates with each other. Therefore, it is possible to effectively take measures against the above, and there is an excellent effect that it is possible to eliminate the appearance of an unauthorized mobile device.

[Brief description of drawings]

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

FIG. 2 is an explanatory diagram of a signal sequence and processing between a mobile station and a network (exchange) in a state where there is no fraud in the mobile communication system of the present invention.

FIG. 3 is an explanatory diagram of a signal sequence and processing between the mobile unit and the network (switch) when “storage completion” indicating the completion of processing of the mobile communication system of the present invention cannot be received by the network.

FIG. 4 is an explanatory diagram of a signal sequence and processing between a mobile device and a network (exchange) when an unauthorized mobile device is used due to an illegal copy of the mobile communication system of the present invention.

[Explanation of symbols]

 100 mobile device 111 telephone 112 modulator 113 transmitter 114 duplexer 115 antenna 116 receiver 117 demodulator 118 control unit 119 mobile device stored data processing unit 120 mobile device stored data memory 121 frequency synthesizer 200 network 210 antenna 220 base station 221 Radio unit 222 Control unit 230 Switch 240 Subscriber memory

Claims (2)

[Claims] 1. A plurality of base stations connected to a communication network, and a plurality of mobile stations connected to the base stations via wireless lines, wherein the mobile stations are provided with unique identification information assigned thereto. In the mobile communication system, which is provided with storage means for holding, and the network is provided with memory means for holding identification information of the mobile device, the storage means includes a storage area for storing an identification code separately from the identification information. The memory means includes a storage area for storing the identification code in association with the identification information, and the network moves to the network when the identification information added to the transmission request from the mobile device is appropriate. A means for transmitting a request for transmitting the identification code to the machine, the mobile device comprising means for reading and transmitting the identification code stored in the storage area based on the request for transmitting the identification code. The above The transmitted identification code is compared with the identification code stored in the storage area, and when they match, communication is permitted and a new identification code different from the stored identification code is generated. And a means for transmitting the storage completion notification to the network by storing a new identification code transmitted instead of the identification code stored in the storage area, A mobile communication system characterized in that the network comprises means for replacing the identification code stored in the storage area with a new identification code based on the storage completion notification. 2. The mobile communication system according to claim 1, wherein said network includes means for again transmitting and confirming a transmission request of the identification code when the storage completion notification cannot be received from said mobile device.