JP2008205548A - Portable terminal apparatus and key - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable terminal apparatus or a key capable of holding a distance between the portable terminal apparatus and the key, which determines success/fail of authentication, at a fixed value even when a radio wave propagation environment is changed by dynamically setting a threshold for determining the success/fail of authentication between the portable terminal apparatus and the key to a value corresponding to the radio wave propagation environment. <P>SOLUTION: The portable terminal apparatus 1 is provided with: an authenticating wireless control part 111 for performing wireless communication with the key 2; an authentication control part 113 for detecting the receiving intensity of a radio wave received from the key 2 by the authenticating wireless control part 111; a portable terminal control part 15 for controlling the portable terminal so as to perform prescribed processing in accordance with whether the receiving intensity detected by the authentication control part 113 is a certain threshold and more or not; and a threshold setting part 112 for setting the threshold for allowing the portable terminal control part 15 to perform the prescribed processing on the basis of the receiving intensity detected by the authentication control part 113 at an optional point of time. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a portable terminal device that prohibits part or all of the functions from being executed when the portable terminal device is misplaced or stolen, and a key that issues an alarm to the portable terminal device owner.

  In recent years, portable electronic devices such as mobile phones, PDAs, and personal computers have been widely used. However, there are many cases of loss or theft due to misplacement, etc., and there is an increased risk of unauthorized use by others and leakage of personal information such as phone books. It is becoming.

  The following is proposed as an example of the technology for improving the security. That is, a use restriction composed of a mobile terminal device such as a mobile phone, a PDA, or a personal computer and a key (wireless communication unit) attached to the mobile terminal device and shaped to be portable by the user of the mobile terminal device System. In this use restriction system, the mobile terminal device uses the mobile terminal device during a period when the reception intensity of the radio wave received from the key is equal to or greater than a certain threshold and is wirelessly authenticated with the key (a period during which authentication is successful). On the other hand, during the period when the distance from the key is far away and the reception strength is lower than the threshold (the period when authentication fails), the cancellation of the restriction on use of the mobile terminal device is stopped and the operation becomes impossible At the same time, a key whose reception intensity has decreased to a predetermined value or less issues an alarm signal (see, for example, Patent Document 1).

In addition, the mobile terminal device and the key are configured to be able to select a threshold value for determining whether the reception strength is high or low from a plurality of candidates, and the mobile terminal device and the key are selected based on any one of the selected threshold values. There is also a portable terminal device in which the distance for determining the success or failure of authentication can be adjusted by determining the level of reception intensity.
Patent No. 293276

  The threshold value is a reception intensity when the mobile terminal device or the key receives a radio wave radiated from a radiation source separated by a predetermined distance in a certain radio wave propagation environment. For example, the threshold value is a radio wave between the mobile terminal device and the key. In the environment where there is almost nothing to block the propagation of radio waves (even if there is almost no hindrance to radio wave propagation), the reception intensity measured at a point 3 m, 5 m, 10 m away from the radiation source that radiates radio waves is set as a threshold . However, since the portable terminal device and the key are used in various radio wave propagation environments, the distance between the key and the portable terminal device assumed by the threshold value preset in the portable terminal device or the key is actually the same. It is conceivable that the distance between the mobile terminal device and the key when the radio wave having the threshold reception intensity is received does not necessarily match. For example, even if the threshold set in advance for the mobile terminal device or the key is assumed to be a distance of 10 m between the mobile terminal device and the key, the reception intensity of the mobile terminal device or the key having the same threshold value in an environment where the radio wave propagation condition is bad It is possible that the actual distance between the mobile terminal device and the key when 5 is received is 5 m.

  For this reason, the configuration for determining whether the reception strength is high or low based on a threshold fixedly set in advance in the mobile terminal device or the key is based on the distance between the mobile terminal device and the key assumed to be used to determine whether authentication is successful or not. However, in a specific radio wave propagation environment, the distance that is different from the presented distance becomes the distance that separates the success or failure of the user, and confuses the user. It is possible.

  Therefore, by dynamically setting the threshold value to a value according to the radio wave propagation environment, even if the radio wave propagation environment changes, the mobile terminal that can keep the distance between the portable terminal device that separates the success of authentication and the key constant A device or key is required.

  The present invention has been made in view of the above circumstances, and by dynamically setting a threshold value for determining success or failure of authentication between a mobile terminal device and a key to a value according to the radio wave propagation environment, the radio wave propagation environment is Even if it changes, it aims at providing the portable terminal device or key which can keep the distance of the portable terminal device which divides authentication success, and a key constant.

  The portable terminal device of the present invention includes a wireless unit that performs wireless communication with a key, a detection unit that detects reception intensity of a radio wave received from the key by the wireless unit, and a threshold value that has a reception intensity detected by the detection unit The control unit should execute the predetermined process based on the control unit that controls to execute the predetermined process according to whether it is above or less and the reception intensity detected by the detection unit at an arbitrary time point And a threshold value setting unit for setting the threshold value.

  The key of the present invention includes: a wireless unit that performs wireless communication with a mobile terminal device; a detection unit that detects reception intensity of radio waves received from the mobile terminal device by the wireless unit; and a reception intensity detected by the detection unit. A notification unit that notifies when it is less than a certain threshold, and a threshold setting unit that sets the threshold to be notified by the notification unit based on the received intensity detected by the detection unit at an arbitrary time point. is there.

  With this configuration, it is possible to set a threshold for determining the success or failure of wireless authentication at any time depending on the level of reception strength. Therefore, even if the radio wave propagation environment changes, the distance between the mobile terminal device and the key that determines the success or failure of authentication is constant Can keep.

  The portable terminal device of the present invention includes an operation unit that receives various input operations, and the detection unit detects when the threshold setting unit receives an input operation for setting the threshold by the operation unit. The control unit sets the threshold value for executing a predetermined process based on the reception intensity.

  The key of the present invention includes an operation unit that accepts various input operations, and the reception intensity detected by the detection unit when the threshold setting unit accepts an input operation for setting the threshold by the operation unit. The threshold value to be notified by the notification unit is set based on the above.

  With this configuration, even if the radio wave propagation environment changes, the operation is performed with the mobile terminal device and the key separated by a certain distance even if the radio wave propagation environment changes due to the configuration in which the reception intensity threshold is set when the user performs a predetermined operation. If this is done, it is possible to match the length that is expected by the user to determine the success or failure of authentication by the mobile terminal device and the distance that will determine the success or failure of authentication as a result of the mobile terminal device actually performing the authentication process. it can.

  In the portable terminal device according to the present invention, the threshold setting unit sets the threshold for the control unit to execute a predetermined process based on the reception intensity detected by the detection unit at regular intervals. including.

  The key of the present invention includes a key in which the threshold setting unit sets the threshold to be notified by the notification unit based on a reception intensity detected by the detection unit at regular intervals.

  With this configuration, even when the distance between the mobile terminal device and the key hardly changes, even if the radio wave propagation environment changes (for example, the radio wave propagation environment is deteriorated by placing the mobile terminal device or key in a bag or pocket). However, it is possible to automatically update the threshold value for determining whether the authentication has succeeded or failed, and to keep the distance between the portable terminal device and the key for determining the success or failure of the authentication constant.

  Further, in the portable terminal device of the present invention, the threshold setting unit averages the reception intensity detected by the detection unit at each of a plurality of arbitrary points included in a predetermined period, and the averaged numerical value is the control unit. Is set as the threshold value for executing a predetermined process.

  In the key of the present invention, the threshold setting unit averages the received intensity detected by the detection unit at a plurality of arbitrary time points included in a predetermined period, and the notification unit notifies the averaged numerical value. Set as the threshold value to be included.

  With this configuration, when the distance between the mobile terminal device and the key hardly changes, even if the radio wave propagation environment changes, a threshold value for determining whether authentication has succeeded or failed depends on a change in the value of the reception intensity. The distance between the portable terminal device that automatically updates and determines whether authentication is successful and the key can be kept constant.

  In the mobile terminal device of the present invention, the threshold value setting unit should execute the predetermined process based on the reception intensity detected by the detection unit at a plurality of arbitrary time points included in a predetermined period. When the condition for resetting the threshold value is satisfied, a numerical value calculated based on the reception intensity detected by the detection unit at each of the plurality of arbitrary time points is used as the threshold value for the control unit to execute a predetermined process. Includes things to set.

  In the key of the present invention, the threshold setting unit resets the threshold to be reported by the notification unit based on the reception intensity detected by the detection unit at each of a plurality of arbitrary points included in a predetermined period. In the case where the condition is satisfied, a value calculated based on the reception intensity detected by the detection unit at each of the plurality of arbitrary time points is set as the threshold value to be notified by the notification unit.

  With this configuration, when the distance between the mobile terminal device and the key hardly changes, even if the radio wave propagation environment changes, a threshold value for determining whether authentication has succeeded or failed depends on a change in the value of the reception intensity. The distance between the portable terminal device that automatically updates and determines whether authentication is successful and the key can be kept constant.

  Further, in the portable terminal device of the present invention, the threshold setting unit has a difference in reception intensity detected by the detection unit at the first time point and the last time point included in the predetermined period that is smaller or larger than a predetermined value. A case in which a numerical value calculated based on the difference in reception strength is set as the threshold value for the control unit to execute a predetermined process.

  In the key of the present invention, when the threshold setting unit detects that the difference between the reception strengths detected by the detection unit at the first time point and the last time point included in the predetermined period is smaller or larger than a predetermined value, The numerical value calculated based on the difference of the reception intensity is included as the threshold value to be notified by the notification unit.

  With this configuration, when the distance between the mobile terminal device and the key hardly changes, even if the radio wave propagation environment changes, a threshold value for determining whether authentication has succeeded or failed depends on a change in the value of the reception intensity. The distance between the portable terminal device that automatically updates and determines whether authentication is successful and the key can be kept constant.

  In the mobile terminal device of the present invention, the threshold value setting unit uses the reception intensity detected by the detection unit at an arbitrary time and the distance between the mobile terminal device and the key when the reception intensity is detected. In this case, a numerical value calculated based on a predetermined distance specified based on the unit length in the case of the length is set as the threshold value for the control unit to execute a predetermined process.

  In the key of the present invention, the threshold value setting unit determines the reception strength detected by the detection unit at an arbitrary time point, and the distance between the key and the mobile terminal device when the reception strength is detected as a unit length. In this case, a numerical value calculated based on a predetermined distance specified based on the unit length is set as the threshold value to be notified by the notification unit.

  With this configuration, the user sets the distance that determines the success or failure of the authentication based on the distance between the mobile terminal device and the key when the reception strength is detected, thereby allowing the mobile terminal device and the key to be predicted by the user. It is possible to easily adjust the distance while matching the length for determining the success or failure of the authentication with the distance for determining the success or failure of the authentication as a result of the actual authentication process.

  In the mobile terminal device according to the present invention, the threshold setting unit may receive the first distance and the first distance specified based on the reception intensity detected by the detection unit at an arbitrary time and the unit length. Each of the numerical values calculated based on the second distance longer than the first distance is set as a first threshold value and a second threshold value that the control unit should execute a predetermined process, and the control unit If the reception intensity detected by the detection unit transitions from less than the first threshold value to the above, control is performed to allow execution of various functions provided in the mobile terminal device, and the reception intensity detected by the detection unit is the second level. Including a lock control unit that restricts execution of at least one of various functions provided in the mobile terminal device.

  In the key of the present invention, the threshold setting unit may be configured to receive the received intensity detected by the detection unit at an arbitrary time and the first distance and the first distance specified based on the unit length. Each of the numerical values calculated based on the long second distance is set as a first threshold value and a second threshold value that the control unit should execute a predetermined process, and the notification unit is configured to detect the detection unit. The notification is terminated if the reception strength detected by the detector transitions from less than the first threshold to above, and the notification is started if the reception strength detected by the detection unit transitions from the second threshold to less than the first threshold. including.

  With this configuration, it is possible to increase restrictions on various functions that can be executed by the mobile terminal device or variations in restriction release timing, and it is possible to increase variations that are notified by keys. As a result, the mobile terminal device can be restricted and released from various functions at a distance suitable for the user's usage of the mobile terminal device and the key, and the key can be controlled for notification.

  Moreover, the portable terminal device of the present invention includes a device in which the wireless unit transmits, to the key, a numerical value set by the threshold setting unit as the threshold for the control unit to execute a predetermined process.

  The key of the present invention includes a wireless unit that performs wireless communication with the mobile terminal device of the present invention, a detection unit that detects reception intensity of radio waves received from the mobile terminal device by the wireless unit, and the detection unit. A notification unit that notifies when the received intensity to be detected is less than a threshold value, and a numerical value that should be set as the threshold value received from the mobile terminal device by the wireless unit are set as the threshold value that should be notified by the notification unit A threshold setting unit.

  With this configuration, the threshold set by the mobile terminal device can also be set for the key. For this reason, it is not necessary to perform the threshold setting process in each of the mobile terminal device and the key.

  According to the mobile terminal device and the key of the present invention, the radio wave propagation environment is changed by dynamically setting a threshold value for determining success or failure of authentication between the mobile terminal device and the key to a value according to the radio wave propagation environment. In addition, it is possible to keep the distance between the portable terminal device and the key that determines the success or failure of authentication constant.

  Hereinafter, a mobile terminal device and a key according to an embodiment of the present invention will be described in detail.

(First embodiment)
First, an example of setting the reception strength threshold value in the mobile terminal device using the mobile terminal device and the key according to the first embodiment of the present invention represents the operation for setting the reception strength threshold value shown in FIG. This will be described with reference to the schematic diagram. In the following description, setting a threshold value of reception strength necessary for wireless authentication between the mobile terminal device and the key to the mobile terminal device or the key is referred to as “performing calibration processing”.

  In the schematic diagram shown in FIG. 1A, it is assumed that the user who has the portable terminal device 1 and the key 2 has the portable terminal device and the key in a state where they are separated by a certain distance L. FIG. 1A illustrates a case where the user has the mobile terminal device 1 in his hand and the key 2 in his bag. When the user wants to perform calibration processing, when the user performs a predetermined operation on the operation panel of the mobile terminal device 1 or presses a specific button, the mobile terminal device 1 detects the operation performed on the operation panel. With this as a trigger, the reception intensity of the radio wave received from the key 2 at that time is set as the threshold value of the reception intensity. As a result, this process causes the mobile terminal device 1 to set the distance L between the mobile terminal device 1 and the key 2 as a distance that determines whether authentication is successful or not.

  As described above, even if the radio wave propagation environment changes due to the configuration in which the threshold value of the reception intensity is set in the mobile terminal device 1 at an arbitrary time point when the user performs a predetermined operation to perform the calibration process, It is possible to match the expected length that determines whether or not the authentication by the mobile terminal device 1 is successful with the distance L that determines whether or not the authentication is successful as a result of the mobile terminal device 1 actually performing the authentication process.

  FIG. 2 shows a functional block diagram of the mobile terminal device and the key according to the first embodiment of the present invention. The mobile terminal device 1 according to the first embodiment of the present invention includes a wireless authentication unit 11, a mobile communication wireless control unit 12, an output unit 13, an operation key 14, and a mobile terminal control unit 15. The key 2 according to the first embodiment of the present invention includes a wireless authentication unit 21 and an alarm sound output unit 22.

  In the wireless authentication unit 11 of the mobile terminal device 1, the authentication wireless control unit 111 transmits radio waves for short-range communication or UWB (Ultra Wide Band) used for RFID (Radio Frequency Identification) via an antenna. : Ultra-wideband radio) or the like is used to control transmission / reception of a carrier wave including the identification code signal of the key 2 set as a pair with the portable terminal device 1 by pairing processing based on a predetermined communication protocol. The authentication wireless control unit 111 includes circuits such as an amplifier circuit, a modulation circuit, a demodulation circuit, an encoding circuit, and a decoding circuit. The authentication control unit 113 measures the reception intensity of radio waves used in wireless communication (for example, calculated based on the voltage of radio waves input to the demodulation circuit and the error rate of data decoded by the decoding circuit). At the same time, it is determined whether the received intensity is greater than or less than the numerical value stored in the threshold value storage unit 112. If the measured reception intensity is equal to or greater than the numerical value stored in the threshold value storage unit 112, the authentication control unit 113 subsequently uses the key 2 identification ID included in the decoded data with the key 2 as a pair. Compared with the identification ID acquired in advance by the ring process, if it matches, a use restriction release signal notifying that the authentication with the key 2 is successful is output to the portable terminal control unit 115. A use restriction request signal notifying that the authentication has failed is output to the mobile terminal control unit 115. On the other hand, if the measured reception intensity is less than the numerical value stored in the threshold storage unit 112, the authentication control unit 113 sends a use restriction request signal notifying the mobile terminal control unit 115 that the authentication with the key 2 has failed. Output.

  The portable terminal control unit 15 places restrictions on the execution of the various functions that can be executed by the portable terminal device 1 during the period when the use restriction request signal is notified from the authentication control unit 113. As an example of the restriction by the mobile terminal control unit 15, control is performed so that the mobile communication radio control unit 12 that controls radio communication processing with the mobile phone base station does not perform part or all of the communication processing. Control so that the speaker 131 of the output unit 13 does not output sound, the microphone 132 does not pick up sound, the LCD 133 does not display sound, or the operation keys 14 do not accept input operations. And so on. Further, when the portable terminal control unit 15 detects that an operation assigned to cause the portable terminal device 1 to execute the calibration process is input by the operation key 14, the calibration that requests that the calibration process is performed. The request signal is output to the authentication control unit 113.

  When the authentication control signal is input from the portable terminal control unit 15, the authentication control unit 113 outputs the received intensity value measured after the input of the signal to the threshold storage unit 112 and stores it in the threshold storage unit 112. . Among the radio waves received from the key 2, the radio waves received from the key 2 after successful authentication with the key 2, particularly a response signal, are preferable for the authentication control unit 113 to measure the reception intensity. Radio waves are preferred. In order to explain the response signal, a signal transmitted and received for wireless authentication between the mobile terminal device 1 and the key 2 will be specifically described.

  Upon receiving the identification ID of the key 2 from the key 2, the mobile terminal device 1 determines that the identification ID received from the key 2 and the paired identification ID stored in the mobile terminal device 1 match. Is notified to the key 2 that the identification IDs match (that is, that there is a paired mobile terminal device 1 within a certain distance), and the mode is shifted to the authentication mode. The key 2 continues to periodically transmit the identification ID of the key 2 when there is no notification from the portable terminal device 1, while the portable terminal device 1 continues from the key 2 until the identification ID received from the key 2 matches. Continue to receive the signal (standby mode).

  When the key 2 is notified from the portable terminal device 1 that the identification IDs match, the key 2 thereafter periodically authenticates with the portable terminal device 1 using a challenge and response method. Specifically, when the key 2 receives a signal notifying that the identification IDs match from the mobile terminal device 1, the key 2 transmits a challenge request to the mobile terminal device 1, and the mobile terminal device 1 that has received the challenge request A challenge signal generated by generating a random number is transmitted to the key 2, and the key 2 that has received the challenge signal transmits a response signal generated by performing an encryption process on the challenge signal to the mobile terminal device 1, The mobile terminal device 1 that has received the response signal determines that the authentication has succeeded if the decrypted response signal matches the challenge signal, and determines that the authentication has failed if the decrypted response signal does not match the challenge signal. To do. When the authentication is successful, the key 2 performs the above process again at a predetermined time interval. On the other hand, when the authentication fails, the key 2 shifts to the standby mode and starts transmitting the identification ID.

  The response signal is a signal that the mobile terminal device first receives from the key after the mobile terminal device identifies the key by the identification ID, and can be received only from the paired key. For this reason, the authentication control unit 113 outputs the reception intensity value of the radio wave carrying the response signal to the threshold storage unit 112 and stores it in the threshold storage unit 112, thereby receiving the radio wave transmitted from the key 2 of the pair. Only the intensity can be used for the calibration process (that is, radio waves from the keys possessed by other mobile terminal users are not used for the calibration process).

  In the wireless authentication unit 21 of the key 2, the authentication wireless control unit 211 is connected to an radio wave for short-range communication or UWB (Ultra Wide Band) used for RFID (Radio Frequency Identification) via an antenna. : Ultra-wideband radio) or the like is used to control transmission / reception of a carrier wave including the identification code signal of the mobile terminal device 1 set in a pair with the key 2 by pairing processing based on a predetermined communication protocol. The authentication wireless control unit 211 includes circuits such as an amplifier circuit, a modulation circuit, a demodulation circuit, an encoding circuit, and a decoding circuit. The authentication processing unit 213 measures the reception intensity of radio waves used in wireless communication (for example, calculated based on the voltage of radio waves input to the demodulation circuit and the error rate of data decoded by the decoding circuit). At the same time, it is determined whether the received intensity is greater than or less than the numerical value stored in the threshold value storage unit 212. If the measured reception intensity is greater than or equal to the numerical value stored in the threshold value storage unit 212, the authentication processing unit 213 subsequently identifies (checks) the identification ID of the mobile terminal device 1 included in the decoded data. Compared with the identification ID acquired in advance by the pairing process performed with the device 1, an alarm release signal for notifying that the authentication with the mobile terminal device 1 is successful if the IDs match is output to the alarm sound output unit 22. If they do not match, an alarm request signal notifying that the authentication with the portable terminal device 1 has failed is output to the alarm sound output unit 22. On the other hand, if the measured reception intensity is less than the numerical value stored in the threshold value storage unit 212, the authentication processing unit 213 sends an alarm request signal for notifying that the authentication with the mobile terminal device 1 has failed to the alarm sound output unit 22 Output to.

  The alarm sound output unit 22 is configured by a speaker and starts outputting an alarm sound when an alarm request signal is input from the authentication processing unit 213.

  As described above, according to the mobile terminal device and the key according to the first embodiment of the present invention, the reception intensity threshold is set in the mobile terminal device when the user performs a predetermined operation to perform the calibration process. Even if the radio wave propagation environment changes, if the calibration process is performed again in a state where the mobile terminal device and the key are separated from each other by a certain distance, the expected length of the authentication by the mobile terminal device, which is expected by the user, As a result of the mobile terminal device actually performing the authentication process, it is possible to match the distance that determines the success or failure of the authentication.

In the calibration process, the measured reception intensity value is stored as a threshold value. However, the present invention is not limited to this, and another numerical value calculated using the measured reception intensity is stored as the threshold value. May be. That is, in the schematic diagram showing the setting operation of the threshold value of the reception strength shown in FIG. 1A, the mobile terminal device 1 sets the reception strength of the radio wave received from the key separated by a constant interval L as the threshold value. The distance that determines the success or failure of the authentication is regarded as L. However, in another schematic diagram showing the setting operation of the threshold value of the reception intensity shown in FIG. By setting a numerical value obtained by multiplying the reception intensity by 1 / K ² (K is a real number) as a threshold value, the distance that determines the success or failure of authentication is regarded as K × L. This threshold setting method utilizes the fact that the electromagnetic field intensity of radio waves attenuates in inverse proportion to the square of the propagation distance. The real number K is a numerical value set by the user according to the distance between the portable terminal device 1 and the key 2 when the calibration process is performed.

  The mobile terminal device 1 only measures the reception intensity of the radio wave received from the key 2, and does not measure the distance L between the mobile terminal device 1 and the key 2. However, the mobile terminal device 1 recognizes the distance L between the mobile terminal device 1 and the key 2 as a unit length (a numerical value of the unit length is added by measurement) in the above threshold setting method, and determines the unit length. The distance L ′ (L ′ = K × L) represented on the basis is regarded as a distance that determines the success or failure of the authentication. With this configuration, the user sets a distance L ′ that divides the success or failure of authentication based on the distance (unit length L) between the mobile terminal device and the key when the mobile terminal device performs calibration processing. Therefore, the length that divides the success / failure of the authentication by the mobile terminal device predicted by the user and the distance that divides the success / failure of the authentication as a result of the mobile terminal device actually performing the authentication process are matched and simplified. The distance can be adjusted.

Further, according to the threshold value setting method described above, the mobile terminal device is configured such that a numerical value obtained by multiplying the reception intensity of the radio wave received from the key 2 separated by a constant interval L by 1 / K ² (K is a real number) is set as a threshold value. 1 stores a plurality of threshold values, and limits the various functions that can be executed by the mobile terminal device 1 if the reception intensity of the radio wave received from the key 2 changes from one threshold value to less than the threshold value. In addition, on the other hand, if the reception intensity of the radio wave received from the key 2 changes from less than another threshold value to more than the same threshold value, the restrictions applied to various functions may be released. In another schematic diagram showing the setting operation of the reception intensity threshold value shown in FIG. 1C, the mobile terminal device 1 uses the reception intensity of the radio wave received from the key separated by a certain interval L as the threshold (first 1 / C ² (K is a real number) with respect to the reception intensity of the radio wave received from the key 2 separated by a fixed interval L) and the inner circle in FIG. The threshold (second threshold. The outer circle in FIG. 1C is a boundary that determines the success or failure of authentication) calculated by multiplication. If the reception intensity of the radio wave received from the key 2 changes from the second threshold value to less than the second threshold value (that is, the key 2 moves from “inside” to “outside” of the outer circle). If the reception function of the radio wave received from the key 2 changes from less than the first threshold to more than the first threshold (that is, the key 2) If you move from “outside” to “inside” of the inner circle), you can remove the restrictions added to the various functions.

  This configuration increases the restrictions on various functions that can be executed by the mobile terminal device, or increases variations in restriction release timing. As a result, various functions can be performed on the mobile terminal device at a distance suitable for the user to use the mobile terminal device and keys. Can be restricted or released.

  In the first embodiment of the present invention, it is described that the mobile terminal device 1 receives an operation instructing to perform the calibration process from the user, and the mobile terminal device 1 stores the threshold value. An operation key may be provided, and an operation instructing the key 2 to perform calibration processing may be received from the user, and the threshold value may be stored in the threshold value storage unit 212. Even if the operation key is not provided on the key 2, the key 2 receives the threshold value set from the mobile terminal device that has undergone the calibration process via the authentication wireless control unit 211, and stores the received threshold value as the threshold value. You may make it memorize | store in the part 212. FIG. With this configuration, even with a key, a threshold value can be set in the same way as with a mobile terminal device.

(Second Embodiment)
FIG. 3 shows a functional block diagram of a portable terminal device and keys according to the second embodiment of the present invention. The mobile terminal device 1 according to the second embodiment of the present invention is different from the mobile terminal device 1 according to the first embodiment of the present invention in that the wireless authentication unit 11 includes a timer 114. The processes performed by the other units of the mobile terminal device 1 and the units of the key 2 are the same as those described in the first embodiment, and thus the description thereof is omitted.

  When the authentication control unit 113 inputs the notification signal from the timer 114 that notifies that every time a certain time is measured, the authentication control unit 113 outputs the received intensity value measured after the input of the notification signal to the threshold storage unit 112. And stored in the threshold storage unit 112.

  As described above, according to the mobile terminal device and the key of the second embodiment of the present invention, even when the distance between the mobile terminal device and the key hardly changes, the radio wave propagation environment changes (for example, the mobile terminal device and the key are connected to the bag). And even if the radio wave propagation environment deteriorates by putting it in a pocket), a threshold value for automatically determining whether authentication has succeeded or failed, and a mobile terminal device and a key for separating success or failure of authentication The distance between and can be kept constant.

  In the calibration process, the measured received intensity value is stored as a threshold value. However, the present invention is not limited to this, and in the first embodiment, refer to FIGS. 1B and 1C. As described above, another numerical value that adjusts a distance that is a real number multiple of the unit length as a distance that divides the success or failure of the authentication is stored as a threshold by using the reception intensity measured in a certain unit length. Good.

  In the second embodiment of the present invention, it is described that the mobile terminal device 1 performs the calibration process at regular time intervals and the mobile terminal device 1 stores the threshold value. However, the key 2 is provided with a timer, and the key 2 May be configured to perform calibration processing at regular time intervals and store the threshold value in the threshold value storage unit 212. Further, even if the key 2 is not provided with a timer, the key 2 receives the threshold value set from the mobile terminal device that has performed the calibration process via the authentication wireless control unit 211, and the received threshold value is the threshold value storage unit. 212 may be stored. With this configuration, even with a key, a threshold value can be set in the same way as with a mobile terminal device.

(Third embodiment)
FIG. 4 shows a functional block diagram of a portable terminal device and keys according to the third embodiment of the present invention. The mobile terminal device 1 according to the third embodiment of the present invention is different from the mobile terminal device 1 according to the first embodiment of the present invention in that the wireless authentication unit 11 includes a reception strength storage unit 115 and a threshold value calculation unit 116. Different. The processes performed by the other units of the mobile terminal device 1 and the units of the key 2 are the same as those described in the first embodiment, and thus the description thereof is omitted.

  The reception intensity storage unit 115 inputs the reception intensity measured by the authentication control unit 113, and stores the reception intensity at regular time intervals in the input order. The threshold value calculation unit 116 calculates a threshold value to be stored in the threshold value storage unit 112 from the reception intensity values stored in the reception strength storage unit 115 in chronological order, and outputs the threshold value to the threshold value storage unit 112. Hereinafter, an example of threshold calculation by the threshold calculation unit 116 will be described. FIG. 5 shows the relationship between the received intensity and the threshold value calculated based on the received intensity.

  In the relationship between the reception strength shown in FIG. 5A and the threshold value calculated based on the reception strength, the threshold value calculation unit 116 calculates the average of the reception strengths when four reception strengths are stored in the threshold value storage unit 112. The value is calculated, and the average value is set as the subsequent threshold value. Specifically, during the period from time t1 to time t4, the authentication control unit 113 discriminates the level of the received electric field based on the threshold value obtained by averaging the reception intensity before time t1, and from time t5 to time t8. In the period, the authentication control unit 113 discriminates the level of the received electric field based on the threshold value obtained by averaging the reception intensity during the period from the time t1 to the time t4. In the period after the time t8, the authentication control unit 113 The level of the received electric field is determined based on a threshold value obtained by averaging the received intensity during the period from t5 to time t8.

  Further, in another example of the relationship between the reception strength shown in FIG. 5B and the threshold value calculated based on the reception strength, the threshold value calculation unit 116 calculates the amount of change in the reception strength, and the reception strength exceeds a certain value. If it changes, the threshold value is changed by the change in the received intensity. Specifically, the threshold calculation unit 116 is set to increase or decrease the threshold when the reception strength continuously stored in the reception strength storage unit 115 changes by 10 dBm or more, and the reception strength at time t5 is the time. When it is detected that the reception intensity is decreased by 10 dBm or more compared to the reception intensity at t4, a numerical value reduced by 10 dBm from the threshold value before time t5 is set as a threshold value after time t5, and the authentication control unit 113 receives based on the threshold value. The level of the electric field is discriminated.

  As described above, according to the mobile terminal device of the third embodiment of the present invention, when the distance between the mobile terminal device and the key hardly changes, it is determined that the authentication has succeeded or failed even if the radio wave propagation environment changes. Therefore, the distance between the key and the portable terminal device that determines whether authentication is successful or not can be kept constant by automatically updating the threshold for this in response to a change in the value of the reception intensity.

  In the calibration process, the calculated received intensity value is stored as a threshold. However, the present invention is not limited to this, and in the first embodiment, refer to FIGS. 1B and 1C. As described above, another numerical value that adjusts a distance that is a real number multiple of the unit length as a distance that divides the success or failure of the authentication is stored as a threshold by using the reception intensity calculated with a certain unit length. Good.

  In the third embodiment of the present invention, it is described that the portable terminal device 1 performs the calibration process based on the electric field intensity calculated under a certain condition, and the portable terminal device 1 stores the threshold value. Further, a reception intensity storage unit and a threshold value calculation unit may be provided, the calibration process may be performed based on the electric field intensity calculated under a certain condition of the key 2, and the threshold value may be stored in the threshold value storage unit 212. Further, even if the key 2 does not include a reception intensity storage unit and a threshold calculation unit, the key 2 receives the threshold set from the mobile terminal device that has performed the calibration process via the authentication wireless control unit 211, The received threshold value may be stored in the threshold value storage unit 212. With this configuration, even with a key, a threshold value can be set in the same way as with a mobile terminal device.

  According to the mobile terminal device and the key of the present invention, the radio wave propagation environment is changed by dynamically setting a threshold value for determining success or failure of authentication between the mobile terminal device and the key to a value according to the radio wave propagation environment. However, it is possible to keep the distance between the key and the portable terminal device that determines the success or failure of the authentication, and when the portable terminal device is misplaced or stolen, some or all of the functions are executed. This is useful with respect to prohibited mobile terminals and keys that issue warnings to mobile terminal owners.

(A) Schematic diagram showing operation for setting reception strength threshold (b) Another Schematic diagram showing setting operation for threshold of reception strength (c) Another Schematic diagram showing setting operation for threshold of reception strength Functional block diagram of portable terminal device and key according to first embodiment of the present invention Functional block diagram of portable terminal device and key of second embodiment of the present invention Functional block diagram of portable terminal device and key according to third embodiment of the present invention (A) An example of the relationship between the received intensity and the threshold value calculated based on the received intensity (b) Another example of the relationship between the received intensity and the threshold value calculated based on the received intensity

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mobile terminal device 11 Wireless authentication part 111 Authentication wireless control part 112 Threshold storage part 113 Authentication control part 114 Timer 115 Reception intensity storage part 116 Threshold calculation part 12 Mobile communication wireless control part 13 Output part 131 Speaker 132 Microphone 133 LCD
14 Operation Key 15 Mobile Terminal Control Unit 2 Key 21 Wireless Authentication Unit 211 Authentication Wireless Control Unit 212 Threshold Storage Unit 213 Authentication Processing Unit 22 Alarm Sound Output Unit

Claims (18)

A wireless unit for wireless communication with the key;
A detection unit for detecting a reception intensity of a radio wave received from the key by the wireless unit;
A control unit that controls to execute a predetermined process according to whether the reception intensity detected by the detection unit is greater than or less than a threshold value;
A threshold setting unit configured to set the threshold for the control unit to execute a predetermined process based on the reception intensity detected by the detection unit at an arbitrary time;
A mobile terminal device comprising: The mobile terminal device according to claim 1,
It has an operation unit that accepts various input operations,
The threshold value setting unit is configured to determine the threshold value by which the control unit should execute a predetermined process based on the reception intensity detected by the detection unit at the time when an input operation for setting the threshold value is received by the operation unit. Set,
Mobile terminal device. The mobile terminal device according to claim 1,
The threshold value setting unit sets the threshold value for the control unit to execute a predetermined process based on the reception intensity detected by the detection unit at regular intervals.
Mobile terminal device. The portable terminal device according to any one of claims 1 to 3,
The threshold value setting unit averages the reception intensity detected by the detection unit at a plurality of arbitrary time points included in a predetermined period, and the control unit performs a predetermined process on the average value Set as
Mobile terminal device. The portable terminal device according to any one of claims 1 to 3,
The threshold setting unit, when the reception intensity detected by the detection unit at a plurality of arbitrary time points included in a predetermined period satisfies a condition for resetting the threshold for the control unit to execute a predetermined process The numerical value calculated based on the reception intensity detected by the detection unit at each of the plurality of arbitrary time points is set as the threshold value for the control unit to perform a predetermined process.
Mobile terminal device. The mobile terminal device according to claim 5,
The threshold setting unit, based on the difference in reception intensity when the difference in reception intensity detected by the detection unit at each of the first time point and the last time point included in the predetermined period is smaller or larger than a predetermined value. The calculated numerical value is set as the threshold value at which the control unit should execute a predetermined process.
Mobile terminal device. The mobile terminal device according to any one of claims 1 to 6,
The threshold setting unit sets the unit length when the reception intensity detected by the detection unit at an arbitrary time and the distance between the mobile terminal device and the key when the reception intensity is detected are set as a unit length. A numerical value calculated based on a predetermined distance specified based on the threshold is set as the threshold at which the control unit should execute a predetermined process;
Mobile terminal device. The mobile terminal device according to claim 7,
The threshold setting unit includes a reception intensity detected by the detection unit at an arbitrary time point, a first distance specified based on the unit length, and a second distance longer than the first distance. Each of the numerical values calculated based on the control unit is set as a first threshold value and a second threshold value at which the control unit should execute a predetermined process,
The control unit controls to allow execution of various functions provided in the mobile terminal device when the reception intensity detected by the detection unit transitions from less than the first threshold to more than the first threshold, and detects by the detection unit Including a lock control unit that restricts execution of at least one of various functions provided in the mobile terminal device if the reception intensity transitions from the second threshold value to less than the second threshold value;
Mobile terminal device. It is a portable terminal device given in any 1 paragraph of Claims 1-8,
The wireless unit transmits a numerical value set by the threshold setting unit as the threshold to be executed by the control unit to the key.
Mobile terminal device. A wireless unit that performs wireless communication with the mobile terminal device according to claim 9;
A detection unit for detecting a reception intensity of a radio wave received from the portable terminal device by the wireless unit;
An informing unit for informing when the reception intensity detected by the detecting unit is less than a threshold value;
A threshold value setting unit configured to set, as the threshold value to be notified by the notification unit, a numerical value to be set as the threshold value received from the mobile terminal device by the wireless unit;
Key with. A wireless unit that performs wireless communication with the mobile terminal device;
A detection unit for detecting a reception intensity of a radio wave received from the portable terminal device by the wireless unit;
An informing unit for informing when the reception intensity detected by the detecting unit is less than a threshold value;
A threshold setting unit configured to set the threshold to be notified by the notification unit based on the reception intensity detected by the detection unit at an arbitrary time;
Key with. The key according to claim 11,
It has an operation unit that accepts various input operations,
The threshold setting unit sets the threshold to be notified by the notification unit based on the reception intensity detected by the detection unit at the time when an input operation for setting the threshold is received by the operation unit.
Key. The key according to claim 11,
The threshold setting unit sets the threshold to be notified by the notification unit based on the reception intensity detected by the detection unit at regular intervals.
Key. A key according to any one of claims 11 to 13,
The threshold setting unit averages the reception intensity detected by the detection unit at each of a plurality of arbitrary points included in a predetermined period, and sets the averaged numerical value as the threshold to be notified by the notification unit.
Key. A key according to any one of claims 11 to 13,
The threshold setting unit, when the reception intensity detected by the detection unit at a plurality of arbitrary time points included in a predetermined period satisfies a condition for resetting the threshold to be notified by the notification unit, A numerical value calculated based on the reception intensity detected by the detection unit at each arbitrary time point is set as the threshold value to be notified by the notification unit.
Key. The key according to claim 15,
The threshold setting unit, based on the difference in reception intensity when the difference in reception intensity detected by the detection unit at each of the first time point and the last time point included in the predetermined period is smaller or larger than a predetermined value. Setting the calculated numerical value as the threshold value to be notified by the notification unit;
Key. A key according to any one of claims 11 to 13,
The threshold setting unit sets the unit length when the reception intensity detected by the detection unit at an arbitrary time and the distance between the key and the mobile terminal device when the reception intensity is detected are unit length. A numerical value calculated based on a predetermined distance specified based on the threshold is set as the threshold to be notified by the notification unit;
Key. A key according to claim 17,
The threshold setting unit includes a reception intensity detected by the detection unit at an arbitrary time point, a first distance specified based on the unit length, and a second distance longer than the first distance. Each of the numerical values calculated based on the control unit is set as a first threshold value and a second threshold value at which the control unit should execute a predetermined process,
The notification unit terminates the notification when the reception intensity detected by the detection unit shifts from less than the first threshold to above, and the reception intensity detected by the detection unit shifts from above the second threshold to less than To start the notification,
Key.

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