JP3204428B2 - Wireless communication device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[Table of Contents] The present invention will be described in the following order. BACKGROUND OF THE INVENTION Problems to be Solved by the Invention Means for Solving the Problems (FIGS. 1, 3 and 5) Function (FIGS. 1, 3 and 5) Example (1) Example (FIGS. 1 to 4) (2) Effects of Embodiment (3) Other Embodiments (FIG. 5) Effects of the Invention

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio communication apparatus, and can be applied to, for example, a digital cellular phone which encodes and transmits a voice signal.

[0003]

2. Description of the Related Art Conventionally, in a digital cellular which is one of radio telephones, a SIM (subscriber identity) is used.
n modul), so that one terminal device can be commonly used by a plurality of users.

That is, this SIM is an IC card storing a central processing unit and a memory. The SIM includes an access authentication number for accessing a communication network, a password of the SIM, a password of a SIM holder, and other information essential for communication. Thus, service information such as billing information, speed dial information, and short message information is recorded.

[0005] On the other hand, when the SIM is set, the terminal device accesses the SIM prior to the call and reads the access authentication number, the password of the SIM, and the password of the SIM holder. The access is made and the access authentication number, the password of the SIM, and the password of the SIM holder are collated. This allows the terminal device to:
Only when a collation result indicating that a call is permitted is obtained, a line is connected to a desired call target in response to a user operation.

Accordingly, a user can use a shared terminal device or a public terminal device as his / her own terminal device only by selecting a terminal device as required and setting his / her own SIM. .

[0007]

In this type of wireless communication system, it is necessary to prevent unauthorized use of the terminal device. For this purpose, it is necessary to prevent the SIM from being removed from the terminal device during a call, and therefore, the ETSI (European telecommunications standards in
stipulates that a call be terminated as soon as a SIM is removed during communication.

For this reason, some terminal devices of this type adopt a configuration in which after setting a SIM, a battery for supplying a driving power supply is arranged outside the SIM. However, this configuration has a problem that the configuration is complicated and the operation of starting a call is also complicated.

On the other hand, using a switch or the like for SIM
Although a method of detecting the set of (1) is also conceivable, this method has a drawback that if the terminal device is tampered with, illegal use cannot be prevented. In addition, SI through a predetermined holding mechanism
A method of setting M and detecting the operation of the holding mechanism to detect the setting of the SIM is also conceivable. However, in this case, illegal use cannot be completely prevented.

The present invention has been made in view of the above points, and it is an object of the present invention to propose a wireless communication device that can easily and reliably detect that an IC card has been removed.

[0011]

According to the present invention, an IC card 1B is connected to an IC card.
In a wireless communication device 1A capable of connecting a line to a predetermined call target and communicating based on communication data set in the card 1B, the IC card 1B is assigned unique identification data, 1A stores the identification data in a predetermined storage means, starts a call with a call target, accesses the IC card 1B at a predetermined cycle, and identifies the identification data stored in the storage means and the identification detected by the access of the IC card 1B. When the data does not match, the line with the call target is cut off and the call with the call target is stopped.

Further, in the second invention, the IC card 1
B, the wireless communication device 1A is configured to connect to a predetermined communication target and a line based on the communication data set in the IC card 1B so that a telephone call can be made. 23, and the wireless communication device 1A
Accesses the IC card 1B at a predetermined timing after recording the IC card confirmation data in the storage unit 23,
When the IC card confirmation data detected by the access to the IC card 1B does not match the IC card confirmation data stored in the storage means 23 in advance, the line with the call target is cut off and the call with the call target is stopped. I do.

In the third aspect of the present invention, the wireless communication device 1A is configured to store the IC card confirmation data detected by the access to the IC card 1B when the IC card confirmation data matches the IC card confirmation data stored in the storage means 23 in advance. After updating the IC card confirmation data stored in the IC card 23, the IC card 1B is accessed at a predetermined timing, and the IC card 1B is accessed.
When the IC card confirmation data detected by the access does not match the IC card confirmation data updated in advance, the line with the call target is cut off and the call with the call target is stopped.

[0014]

The identification data is stored in a predetermined storage means to start a call with the call target, the IC card 1B is accessed at a predetermined cycle, and the identification data stored in the storage means and the IC card 1B are accessed.
When the identification data detected by the access does not match, if the line with the call target is interrupted and the call with the call target is stopped, if the IC card 1B is removed during the call, the call is immediately made. Can be stopped.

After recording the IC card confirmation data in the storage means 23, the IC card 1B
When the IC card confirmation data detected by the access to the IC card 1B does not match the IC card confirmation data stored in the storage means 23 in advance, the line between the communication target and the communication target is cut off to If you stop calling,
If the IC card 1B is removed during a call, the call can be immediately stopped.

Further, when the IC card confirmation data detected by accessing the IC card 1B matches the IC card confirmation data stored in the storage means 23 in advance, the IC card confirmation data having a different value from the IC card confirmation data is used. By updating the IC card confirmation data stored in the storage means 23 with the data and detecting the match / mismatch again, it is possible to more reliably detect that the IC card 1B has been removed, and immediately stop the call.

[0017]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

(1) Configuration of the Embodiment In FIG. 1, reference numeral 1 denotes a digital cellular terminal device as a whole, which is set by inserting a SIM 1B into a terminal device main body 1A, thereby operating a predetermined operator to make a call. Have been made to gain.

Here, as shown in FIG.
A receives the transmission signal transmitted from the base station by the antenna 2 and outputs the resulting reception signal to the mixer 4 via the antenna sharing device 3. The mixer 4 converts the frequency of the received signal using the local oscillation signal output from the oscillation section 5 and then outputs the signal via the filter 6, whereby the terminal device 1 switches the frequency of the local oscillation signal to a desired frequency. The channel is selectively received.

Analog digital conversion circuit (A / D) 7
Receives the output signal of the filter 6 via the amplifier circuit 8, converts the output signal into a digital value based on a predetermined reference signal, and outputs the digital value. It is configured to be able to demodulate I data I obtained as a result of demodulation. Further, the analog-to-digital conversion circuit 7 inputs the output signal of the amplifier circuit 8 via the phase shifter 9 and converts the input signal into a digital value. Q data Q, which is a different demodulation result, can be demodulated, whereby the GMSK-modulated and transmitted I data and Q data
The data can be demodulated.

The equalizer 10 corrects the I data and Q data for distortion to remove multipaths and outputs the same. The channel decoder 12 selects audio data from the output data of the equalizer 10 and outputs the voice data to the voice decoder 1.
Output to 3. Thus, the voice decoder 13 drives the speaker 14 after demodulating the transmitted audio signal by converting it into I data and Q data.

Thus, the terminal device 1 can receive a voice signal transmitted from a communication target via the base station. Further, the equalizer 10 detects the FCCH, which is a synchronization signal, based on the I data and Q data output from the analog digital conversion circuit 7, outputs the detection result to the central processing unit (CPU) 15, and outputs the result to the central processing unit 15 Controls the operations of the equalizer 10, the channel decoder 12, and the like based on the detection result.

Thus, the terminal device 1 receives predetermined information transmitted from the base station based on the FCCH detection result, and switches the frequency of the local oscillation signal based on the received result, thereby providing a predetermined communication. After switching the frequency to the channel, a predetermined time slot can be received and an audio signal can be received.

On the other hand, the transmission system of the terminal device 1 converts the audio signal output from the microphone 16 into a voice encoder 17.
After converting to audio data, the channel encoder 18
To convert into I data and Q data. Further, a digital / analog conversion circuit (D / A) 19 converts the I data and Q data into I / Q component analog signals,
The mixer 20 converts the analog signals of the I component and the Q component into a transmission signal of a predetermined frequency using a local oscillation signal.

As a result, the terminal device 1
Is output to the power amplifier 22 via the filter 21, and the output signal of the power amplifier 22 is transmitted from the antenna 2 via the antenna duplexer 3. At this time, the terminal device 1 switches transmission and reception timings based on a predetermined timing detection result detected by the equalizer 10, thereby applying a time-division multiplexing method to a plurality of terminal devices from the base station. Out of the transmission signal transmitted to the base station, the time slot assigned to the own station is selectively received, and voice data is transmitted to the base station using the time slot assigned to the own station. .

On the other hand, as shown in FIG.
B is a rewritable read only memory (EEPR) formed of an IC card having a central processing unit 20A built therein.
OM) 21A records access authentication numbers, SIM passwords, information on SIM holders, and other service information, while read-only memory (ROM) 22A
A series of processing procedures of the central processing unit 20 are stored in the central processing unit 20. Further, the SIM 1B secures a work area in the random access memory (RAM) 23 and
Necessary data can be input / output via the O port 24, and the overall operation is controlled by the central processing unit 20A via the system control logic 25.

That is, the SIM 1B is the terminal device main body 1A.
Between the ground GND and the power supply VCC,
As a result, the drive power is supplied from the terminal device main body 1A, and the rewriting power of the EEPROM 21A is input from the terminal device main body 1A via the second power supply terminal VPP. Further, the SIM 1B receives an operation reference clock CLK and a reset signal RST from the terminal device main body 1A, thereby operating based on the clock CLK, and when the reset signal RST is input, switches the entire operation to an initial state.

On the other hand, the I / O port 24 is connected to the I / O port of the terminal device main body 1A,
A control code or the like output from the central processing unit 15 of A is output to the central processing unit 20A, and desired data is output in accordance with the control code. That is, SIM1B uses this control code as
A control code (SELECT) for selecting a directory,
A control code (READ BINARY) for outputting data of the memory to the terminal device main unit 1A in byte units, a control code (READ RECORD) for outputting data of the memory to the terminal device main unit 1A in record units, and updating of the memory data in byte units Control code (UPDATE B)
INARY), and a control code (UPDATE DATA RECORD) for updating data in the memory on a record-by-record basis is assigned.

When these control codes are input, the SIM 1B accesses the memories 21A to 23 according to the processing procedure stored in the ROM 22A, and accesses the access authentication number, the SIM password, and the SIM possession as necessary. The data of the user is output to the terminal device main body 1A. As a result, the terminal device main body 1A
When a call is started after B is set, the central processing unit 15 issues a predetermined control code to issue an access authentication number,
After fetching the data of the SIM password and the SIM holder, the center station can be called to verify the access authentication number and the like.

When the collation result indicating that the call is permitted at the center station is obtained in this way, the central processing unit 15
Outputs a control signal to the oscillating unit 5 to switch the receiving channel and the transmitting channel to the calling channel,
Here, by executing a series of processing set in advance, a line is connected to a call target desired by the user,
Make a call with this call target. At this time, the central processing unit 15 executes the processing procedure shown in FIG. 4 to determine whether or not the SIM 1B is kept in the set state, and if it is determined that the SIM 1B has been removed, immediately Interrupt the call by interrupting the line.

That is, the central processing unit 15 proceeds from step SP1 to step SP2, generates a random number when collating an access authentication number or the like, and stores the random number in an internal memory built in the terminal device main body 1A. Further, in the following step SP3, the central processing unit 15 outputs this random number together with a predetermined control code to the SIM 1B, and records this random number in the RAM 23 of the SIM 1B.

In this state, the central processing unit 15 proceeds to step SP4, and after a lapse of a predetermined period, proceeds to the next step SP5, and reads the random number recorded from the RAM 23 of the SIM 1B. Next, the central processing unit 15
Determines whether the read random number matches the random number stored in the internal memory by obtaining a comparison result between the read random number and the random number stored in the internal memory, and obtains a positive result here. Then, the process proceeds to step SP7.

Here, the central processing unit 15 generates a new random number, stores the generated random number in an internal memory,
In the subsequent step SP8, the random number in the RAM 23 is rewritten with the newly generated random number, and the process returns to step SP4. As a result, the central processing unit 15 generates a random number and
B, and confirms that there is no change in the recorded random numbers. Steps SP4-SP5-SP6-
By repeating the processing procedure of SP7-SP8-SP4, the process of recording and confirming the random numbers is repeated at a constant cycle.

If there is no change in the random number recorded in the SIM 1B, the central processing unit 15 can determine that the same SIM 1B is set in the terminal device main body 1A at the time of recording and reading of the random number. By this, the process of recording and confirming the random number is repeated at a constant cycle, and the SIM1
Extraction of B can be detected. Ie SIM
When 1B is extracted, no match result can be obtained between the recorded random number and the read result, so that the central processing unit 15 can obtain a negative result in step SP6.

Thus, the terminal device main unit 1A can detect that the SIM 1B has been extracted with a simple configuration in which a process of generating a random number and recording and confirming it is added to the conventional configuration. That is, the central processing unit 15
If a negative result is obtained in step SP6, the process proceeds to step SP9, in which the line is cut off to forcibly end the call, and then the process proceeds to step SP10 to complete the processing procedure.

Thus, the terminal device 1 can prevent the unauthorized use of the SIM 1B beforehand, and in particular, by using the generated random number, can prevent the unauthorized use of the SIM 1B even if it is modified. In addition, even if the specification of the SIM 1B is changed in the future, this change can be dealt with.

(2) Effects of Embodiment According to the above configuration, the process of recording and reading a random number in the SIM is repeated at a predetermined cycle, and it is confirmed that the recorded random number has not changed. Extraction can be reliably detected, whereby unauthorized use of the SIM 1B can be prevented.

(3) Other Embodiments In the above-described embodiment, the process of recording and reading random numbers in the SIM is repeated at a predetermined cycle, thereby confirming that the recorded random numbers have not changed and confirming that the SIM has not been changed. Although the case where the extraction is detected has been described, the present invention is not limited to this, and the extraction of the SIM may be detected by issuing a control code to the SIM and detecting the response.

That is, as shown in FIG. 5, when a 5-byte instruction code (HEADER) is transmitted from the terminal device main body 1A, the SIM 1B responds to this by sending an acknowledgment (A).
CK) is returned. After that, the SIM 1B accesses the ROM 22 or the like according to the type of the instruction code, and if necessary, obtains data (PARAMETE) as an access result.
R) is input / output between the terminal device main units 1A, and finally a 2-byte status code (AW1, SW2) is transmitted.

As a result, a command code (for example, a command code (V) that reads the password of the SIM holder) that does not affect the entire operation from the terminal device main body 1A at regular intervals.
ERRIFY PIN)) to detect the response of the SIM, it is possible to detect the removal of the SIM.

That is, the access authentication number and the like read for comparison are stored in the memory circuit, and the access authentication number and the like are read from the SIM at a predetermined cycle to obtain a comparison result, thereby detecting the removal of the SIM. . By doing so, the SIM RAM 23 can be omitted, and the overall configuration can be simplified accordingly.

Further, in the above embodiment, the random number is
Although the case where the process of recording and reading in the IM is repeated at a predetermined period has been described, the present invention is not limited to this, and data such as a random number once written may be read at a predetermined period to detect extraction of the SIM. .

Further, in the above-described embodiment, a case has been described in which the present invention is applied to a digital cellular phone to detect removal of an IC card necessary for a telephone call. However, the present invention is not limited to this, and the present invention is applied to an IC card. The present invention can be widely applied to a wireless communication apparatus which is capable of connecting a predetermined call target and a line based on the communication data and making a call.

[0044]

As described above, according to the present invention, it is possible to detect the removal of the IC card simply and reliably by reading the information recorded on the IC card at a predetermined cycle and detecting the removal of the IC card. Yes, this allows IC
A wireless communication device capable of effectively avoiding unauthorized use of a card can be obtained.

[Brief description of the drawings]

FIG. 1 is a side view showing a digital cellular according to an embodiment of the present invention.

FIG. 2 is a block diagram showing the terminal device main body.

FIG. 3 is a block diagram showing the SIM.

FIG. 4 is a flowchart for explaining the operation of the terminal device main body.

FIG. 5 is a block diagram showing a second embodiment.

[Explanation of symbols]

1 terminal device, 1A terminal device body, 1B SI
M, 2 ... antenna, 4 ... mixer, 6 ... filter,
7 ... Analog digital conversion circuit, 10 ... Equalizer, 15, 20A ... Central processing unit, 23 ... RA
M.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04B ⁷ /24-7/26 H04M 1/725 H04Q 7/00-7/38

Claims (3)

(57) [Claims] 1. A wireless communication apparatus in which an IC card is connected so that a call can be made by connecting a line to a predetermined call target based on communication data set in the IC card. The wireless communication device stores the identification data in a predetermined storage means and starts a call with the call target, accesses the IC card at a predetermined cycle, and stores the identification data in the storage means. When the stored identification data and the identification data detected by accessing the IC card do not match, a line between the communication object and the communication object is cut off to stop the communication with the communication object. apparatus. 2. A wireless communication apparatus in which an IC card is connected, and a predetermined call target and a line can be connected and a call can be made based on communication data set in the IC card. The wireless communication device has a predetermined storage unit, and the wireless communication device accesses the IC card at a predetermined timing after recording the IC card confirmation data in the storage unit, and detects the IC card access by the IC card. When the IC card confirmation data does not match the IC card confirmation data stored in the storage means in advance, the line with the call target is cut off and the call with the call target is stopped. Communication device. 3. The wireless communication device according to claim 1, wherein the IC card confirmation data detected by the access to the IC card matches the IC card confirmation data stored in the storage means in advance. When the IC card is accessed at a predetermined timing after updating the IC card confirmation data, and the IC card confirmation data detected by accessing the IC card does not match the previously updated IC card confirmation data. 3. The wireless communication apparatus according to claim 2, wherein a line with the communication target is cut off to stop the communication with the communication target.