JP2001069233A - Communication terminal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the abuse such as the illegal copy (clone) of the inherent information of user stored in a nonvolatile memory. SOLUTION: An eigenvalue setting means consists of a variable resistor 125 and an A/D converter 126. The moving element position of the resistor 125 is moved and adjusted at random, and the converter 126 outputs a random eigenvalue VP for every telephone set. A nonvoltile memory 117 stores the inherent information of a user and also the above-mentioned eigenvalue VP as an inherent key, e.g. when produced. For instance, when the power is on, a normal operation continues as a telephone set only when the eigenvalue VP outputted from the converter 126 coincides with the inherent key stored in the memory 117. When the contents of the nonvolatile memory of another telephone set are copied into the memory 117, the normal operation does not continue but the operation is stopped. Thus, the abuse such as the illegal copy of the inherent information of the user is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication terminal device suitable for use in a portable telephone or the like. More specifically, a unique value setting means for setting a unique value is provided, and the unique value is stored as a unique key together with the user's unique information in the nonvolatile memory, and the unique value set by the unique value setting means is stored in the nonvolatile memory. The normal operation is continued only when the unique key matches the unique key, so that when the content of the nonvolatile memory of another device is copied to the nonvolatile memory, the normal operation is not performed, The present invention relates to a communication terminal device that prevents a problem caused by an illegal copy (clone) of user's unique information.

[0002]

2. Description of the Related Art For example, a simple portable telephone (PHS: Pe)
In a communication terminal device such as an rsonal handyphone system or a mobile phone, user-specific information is generally stored for each device, and each user is charged based on the specific information. This unique information is generally written in a non-volatile memory when a user signs a contract with a mobile phone carrier or the like.

[0003]

When the above-mentioned user-specific information is illegally copied from the authorized device of the authorized user to another device, and the other device is used by a third party, the authorized user becomes aware of the information. You will be incurred damages such as receiving no charges. In view of the above, an object of the present invention is to provide a communication terminal device capable of preventing an adverse effect due to unauthorized copying of user's unique information.

[0004]

A communication terminal device according to the present invention has a unique value setting means for setting a unique value, at least a unique information of a user is stored, and the unique value set by the unique value setting means is unique. Non-volatile memory stored as a key, and operation for controlling to continue normal operation when it is determined that the unique value set by the unique value setting means matches the unique key stored in the nonvolatile memory. Control means.

In the present invention, a unique value is set by the unique value setting means. For example, the eigenvalue setting means is configured using a resistance element such as a semi-fixed resistor, and a value corresponding to the resistance value of the resistance element is output as an eigenvalue. In this case, the eigenvalue is randomly set by changing the resistance value of the resistance element. The unique value set by the unique value setting means as described above is stored as a unique key in the nonvolatile memory in which the unique information of the user is stored. The storage of the unique key in the non-volatile memory is performed, for example, during production.

When the power is turned on, a call operation is performed, and other key operations are performed, the operation control unit determines whether the unique value set by the unique value setting unit matches the unique key stored in the nonvolatile memory. It is determined whether or not they are the same, and when they are determined to be the same, control is performed so as to operate normally. On the other hand, when the operation control means determines that they do not coincide with each other, the operation control means performs control so as to display an abnormality on a display unit constituted by, for example, a liquid crystal display element and stop the operation.

As described above, in the present invention, normal operation is performed only when the unique value set by the unique value setting means matches the unique key stored in the nonvolatile memory. Therefore, when the contents of the nonvolatile memory of another device are copied to the nonvolatile memory, the unique value set by the unique value setting means does not match the unique key stored in the nonvolatile memory, and normal operation is performed. Do not. As a result, the adverse effects of unauthorized copying of the user's unique information,
For example, it is possible to prevent a legitimate user from receiving a charge that the user does not remember.

It is to be noted that a plurality of unique values are set by the unique value setting means, and the plurality of unique values are stored as a plurality of unique keys in the nonvolatile memory, and are set by the unique value setting means. When a plurality of unique values match the plurality of unique keys stored in the non-volatile memory, a normal operation is performed, whereby security can be improved.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a simplified mobile phone 100 as an embodiment. The telephone 100 includes a microcomputer, a control unit 101 for controlling the entire system, an antenna 102 for transmission and reception, and a down-converted received signal of a predetermined frequency captured by the antenna 102. π / 4 shift QPSK (Quadrature Phase Shift Keyin
g) A signal is obtained and a digital modulation / demodulation unit 1 to be described later
The radio section 103 for up-converting the π / 4-shifted QPSK signal output from the P.04 to obtain a transmission signal of a predetermined frequency, and demodulating the π / 4-shifted QPSK signal output from the radio section 103 In addition to receiving the received data, a TDMA (Time Division Multiple Acc
ess) a digital modulation / demodulation unit 104 for modulating the transmission data output from the processing unit 105 to obtain a π / 4 shifted QPSK signal.

[0010] Telephone 100 selects preset downlink slot data from received data (time-division multiplexed data of a plurality of slots) output from digital modulation / demodulation section 104 and separates the data into control data and compressed audio data. At the same time, T is used to multiplex compressed audio data output from the audio codec unit 106 and control data output from the control unit 101 into a preset uplink slot.
It has a DMA processing unit 105.

The telephone 100 has a TDMA processing unit 1.
Decoding processing (including error correction processing) is performed on the compressed audio data output from the receiver 05 to obtain a received audio signal, and compression encoding processing (including error correction code addition processing) is performed on the transmission audio signal. ) To obtain compressed audio data, and an audio codec 1
06, a low-frequency amplifier 107 for amplifying the received voice signal output from the amplifier 106, a speaker 108 as a receiver for outputting a voice based on the voice signal output from the amplifier 107, and a DTM for receiving the voice signal output from the voice codec unit 106.
If the signal is an F (Dual Tone Multiple Frequency) signal,
This DTMF signal is demodulated to obtain a 4-bit (1 nibble) D signal.
And a DTMF demodulator 109 for obtaining a TMF signal code. In this case, D obtained by the DTMF demodulator 109
The TMF signal code is supplied to the control unit 101.

The telephone 100 includes a microphone 111 as a transmitter, a low-frequency amplifier 112 for amplifying an audio signal output from the microphone 111, and a DTMF signal code supplied from the control unit 101.
A DTMF modulator 113 for converting to a signal, and an amplifier 112
Output audio signal or output DT of the DTMF modulator 113
The MF signal is selectively extracted and the audio codec section 106
And a change-over switch 114 for supplying a transmission audio signal to the switch.

In this case, the output side of the amplifier 112 is connected to the fixed terminal on the a side of the changeover switch 114, and the output side of the DTMF modulator 113 is connected to the fixed terminal on the b side. The changeover switch 114 is controlled by the control unit 101, and is connected to the b side when transmitting a DTMF signal, and is connected to the a side when performing another call or the like.

The telephone 100 has a variable resistor 125 and an A / D converter 12 which constitute eigenvalue setting means.
6. Here, one end of the variable resistor 125 is connected to the power supply terminal, the other end is grounded, and the voltage obtained at the mover is input to the A / D converter 126.
In this case, the mover of the variable resistor 125 is randomly moved and adjusted for each telephone at the time of production, for example, and then fixed. That is, the variable resistor 125 is used as a semi-fixed resistor. A / D converter 12
From 6, a value corresponding to the resistance value (movable element position) of the variable resistor 125 is obtained as a unique value VP, and the unique value VP is supplied to the control unit 101.

The telephone 100 includes an operation unit 115 for the user to perform various key operations, a display unit 116 including a liquid crystal display element and the like, a non-volatile memory 117,
Buzzer 1 that sounds under the control of control unit 101 when an incoming call arrives
18 and an incoming lamp 119 that is lit when an incoming call is received. The operation unit 115, the display unit 116, the non-volatile memory 117, the buzzer 118, and the incoming call lamp 119
Each is connected to the control unit 101.

The operation unit 115 includes a call key for instructing a call and answering an incoming call, an end key for ending a call, a numeric keypad for inputting a telephone number, and telephone directory data. , A key for registering telephone directory data, and the like. Display 116
In addition to the state of the system, the phonebook data selected in the search of the phonebook data, the telephone number input by the ten keys, and the like are displayed.

In addition to the telephone directory data, the non-volatile memory 117 also stores the user's unique information, the unique value VP obtained from the A / D converter 126, and the like. Here, the user's unique information is written into the nonvolatile memory 117 when the user concludes a contract with a mobile phone carrier or the like. Further, the unique value VP obtained from the A / D converter 126 is written in the nonvolatile memory 117 as a unique key when the telephone 100 is manufactured.

The control unit 101 also includes a ROM (read only memory) 12 in which an operation program of the microcomputer and a conversion format for converting DTMF signal codes into character codes are written.
0 and a working RAM (rand) for temporarily writing a DTMF signal code and the like obtained by the DTMF demodulator 109.
om access memory) 121.

Next, the simplified portable telephone 100 shown in FIG.
Will be described. When the power is turned on, the control unit 101
The control operation according to the flowchart shown in FIG. When the power is turned on, first, in step ST1, the unique value VP output from the A / D converter 126 is fetched. Then, in step ST2, it is determined whether or not the unique value VP matches the unique key stored in the nonvolatile memory 117. In this determination, it is necessary to consider the fluctuation of the power supply voltage Vcc, the conversion error of the A / D converter 126, and the like. For example, if the error is within a certain error range, it is determined that they match.

When it is determined that the unique value VP matches the unique key, the process proceeds to step ST3, otherwise, the process proceeds to step ST4. In step ST3, normal operation is continued. In step ST4, it is displayed on the display unit 116 that there is an abnormality, and the operation is stopped. Here, when the contents stored in nonvolatile memory 117 are unique to telephone set 100, unique value VP matches the unique key, and normal operation is continued. On the other hand, when the storage content of nonvolatile memory 117 is a copy of the content of the nonvolatile memory of another telephone, the unique value VP does not match the unique key, and the operation is stopped.

Next, a case where normal operation is continued will be described. When the power is turned on, the control channel is out of synchronization with the control channel. Therefore, the control channel transmitted from the base station is received and the synchronization with the control channel is established.
In this case, a search operation for sequentially receiving control channels of available public base stations is performed, and the received signal strength (RSS
I: Receive Signal Strength Indicate) is equal to or higher than the selection level and the largest control channel is selected, and synchronization with the control channel is established. After that, location registration is performed to be in the area of the base station associated with the control channel for which synchronization has been established. This location registration is performed using a call channel. After the location registration is completed,
The state returns to the receiving state of the control channel for which the synchronization has been established, and the apparatus enters the standby state.

The operation for making a call will be described.
In this case, for example, when the telephone number of the other party is input by operating the keys of the operation unit 115 or the call key is operated after searching the telephone directory data, a calling process is performed. That is, telephone number data and the like are supplied as control data from the control unit 101 to the TDMA processing unit 105 and transmitted to the base station through a control channel. As a result, the line connection with the other party is established, and a call state is established.

Here, the communication is performed using the communication channel. At the time of the line connection process, the data of the communication frequency and the slot position of the communication channel are transmitted as control data from the base station using the control channel. TDMA
It is supplied from the processing unit 105 to the control unit 101. Control unit 1
01 controls the radio section 103 based on the communication frequency data so that the transmission / reception frequency matches the communication frequency of the communication channel, and sets the slot selected by the TDMA processing section 105 based on the slot position data. . As a result, it is possible to make a call using the call channel notified from the base station.

Further, paging data is transmitted as control data from the base station using the control channel, and this paging data is supplied from the TDMA processing unit 105 to the control unit 101. When an incoming call is detected, the control unit 101 Buzzer 1
18 is sounded, and the incoming call lamp 119 is controlled to light up, and the user is notified of the incoming call.

In this state, when the user operates the talk key and receives a response, the control unit 101 supplies response data as control data to the TDMA processing unit 105, and transmits the control data to the base station via the talk channel. As a result, the line connection with the other party is established, and a call state is established.

In the talking state, the compressed voice data transmitted through the talking channel is output from the TDMA processing unit 105. The compressed audio data is supplied to the audio codec unit 106, where it is converted into an analog signal after being subjected to a decoding process. Then, the received audio signal output from the audio codec unit 106 is transmitted to the speaker 10 via the amplifier 107.
8 and the speaker 108 outputs a sound based on the received sound signal.

The transmission audio signal output from the microphone 111 is amplified by the amplifier 112, supplied to the audio codec unit 106, converted into a digital signal, and then subjected to a compression encoding process to form compressed audio data. . Then, the compressed audio data output from the audio codec unit 106 is supplied to the TDMA processing unit 105, and transmitted to the other party through the communication channel.

As described above, in the present embodiment, when the power is turned on, only when the unique value VP output from the A / D converter 126 matches the unique key stored in the nonvolatile memory 117, Operate normally.
Therefore, when the content of the nonvolatile memory of another telephone is copied to the nonvolatile memory 117, the unique value VP does not match the unique key stored in the nonvolatile memory 117, and the operation stops. Therefore, in the present embodiment, it is possible to satisfactorily prevent the harmful effects of illegal copying (cloning) of the user's unique information, for example, a legitimate user receiving a charge that the user does not recognize.

In the above embodiment, the eigenvalue setting means uses the variable resistor (semi-fixed resistor) 125, but other configurations may be used. In short,
What is necessary is just to be the structure which can obtain the random eigenvalue VP for every telephone. For example, the eigenvalue setting unit can be configured by selecting and using an arbitrary fixed resistor from a plurality of fixed resistors having random resistance values.

In the above embodiment, one eigenvalue VP is set by the eigenvalue setting means.
A plurality of unique values may be set. In this case, the nonvolatile memory 117 stores the plurality of unique values as a plurality of unique keys. When the control unit 101 determines that the plurality of unique values output from, for example, the unique value setting unit match the plurality of unique keys stored in the nonvolatile memory 117 when the power is turned on, the control unit 101 operates normally. Control to do. Thereby, security can be improved.

In the above-described embodiment, when the power is turned on, it is determined whether or not the unique value VP output from the A / D converter 126 matches the unique key stored in the nonvolatile memory 117. The normal operation is performed only when they match, but it is also conceivable to make a configuration in which this determination is made at the time of a call operation or other key operation, and the normal operation is performed only when they match.

Further, in the above-described embodiment, the present invention is applied to a simple type portable telephone. However, the present invention relates to another communication terminal device which stores user-specific information in a nonvolatile memory. It is needless to say that the same can be applied to the above.

[0033]

According to the present invention, a unique value setting means for setting a unique value is provided, and the unique value is stored as a unique key together with the user's unique information in the nonvolatile memory, and the unique value is set by the unique value setting means. Normal operation is continued only when the unique value stored in the memory matches the unique key stored in the nonvolatile memory. Therefore, when the contents of the non-volatile memory of another device are copied to the non-volatile memory, normal operation is not performed and the operation is stopped, for example, so that the adverse effect due to illegal copying of the user's unique information can be prevented well.

[Brief description of the drawings]

FIG. 1 shows a simplified portable telephone (PH) as an embodiment.
It is a block diagram which shows the structure of S).

FIG. 2 is a flowchart illustrating a control operation when the power is turned on.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 simplified mobile phone 101 control unit 102 transmitting / receiving antenna 103 wireless unit 104 digital modulation / demodulation unit 105 TDMA processing unit 106 audio codec unit 108 speaker 109 DTMF demodulator 111 microphone 113 DTMF modulator 115 operating unit 116 display unit 117 non-volatile memory 118 Buzzer 119 Incoming call lamp 125 Variable resistor 125 A / D converter

Claims (7)

[Claims] 1. A unique value setting means for setting a unique value; a nonvolatile memory storing at least user's unique information and storing the unique value set by the unique value setting means as a unique key; When it is determined that the unique value set by the setting means matches the unique key stored in the nonvolatile memory, operation control means for controlling to continue normal operation is provided. Communication terminal device. 2. The method according to claim 1, wherein the operation control unit further includes a display unit that determines that the unique value set by the unique value setting unit does not match the unique key stored in the nonvolatile memory. The communication terminal device according to claim 1, wherein the communication terminal device performs control so as to display an abnormality and stop the operation. 3. The unique value setting means sets a plurality of unique values, and stores in the nonvolatile memory a plurality of unique values set by the unique value setting means as a plurality of unique keys. The means continues normal operation when determining that the plurality of unique values set by the unique value setting means match the plurality of unique keys stored in the non-volatile memory, respectively. The communication terminal device according to claim 1, wherein the communication terminal device is controlled as follows. 4. The communication terminal device according to claim 1, wherein the eigenvalue setting means is configured using a resistance element, and outputs a value corresponding to a resistance value of the resistance element as the eigenvalue. . 5. The communication terminal device according to claim 4, wherein said resistance element is a semi-fixed resistor. 6. The operation control means determines whether or not the unique value set by the unique value setting means matches the unique key stored in the nonvolatile memory at the time of key operation. The communication terminal device according to claim 1, wherein: 7. The operation control means determines whether or not the unique value set by the unique value setting means matches the unique key stored in the nonvolatile memory when the power is turned on or when a call is made. The communication terminal device according to claim 1, wherein the communication terminal device performs the operation at the time of operation.