JP4041526B2 - Communication system, communication terminal device, and wireless key device - Google Patents

Description

  The present invention relates to a communication system including a communication terminal device such as a mobile phone terminal and a wireless key device that regulates the operation of the terminal device, and to a communication terminal device and a wireless key device that configure the communication system.

  2. Description of the Related Art In recent years, mobile phone terminals, which are one of communication terminal devices that are always carried by users, tend to be multifunctional with various functions built-in in addition to the wireless telephone function that is the original function.

  For example, a camera function for taking a still image or a moving image, a recording / playback function for music data, a viewing function for television broadcasting, and the like are incorporated.

  In addition, a cellular phone terminal having a built-in function as a non-contact type IC card that has been rapidly spread in recent years has been developed. This non-contact type IC card is used as a transportation ticket, membership card or employee card, a card for payment means at a store, etc., and performs wireless communication with a nearby reader / writer, Since authentication processing is performed, it is easier to use than magnetic cards. In addition, when incorporating an IC card function part in a portable terminal, the IC card function part does not necessarily have a card shape.

  By the way, it is preferable that the multi-function mobile phone terminal performs a process of ensuring some security in order to prevent misuse of various functions of the terminal when the terminal is lost. . In particular, in the case of a terminal with a built-in IC card function unit, there is a possibility that personal information stored as an IC card function may be read illegally or an illegal payment using the IC card function may be performed. Therefore, there is a high need for a function that prevents unauthorized use. For example, in Patent Documents 1 and 2, when a wireless card that is paired with a mobile phone terminal is prepared, an authentication request is periodically transmitted from the wireless card, and the verification request cannot be verified, There is a description about restricting the functions of telephone terminals.

  More specifically, when the mobile phone terminal and the wireless card regularly exchange unique IDs (identification information) and maintain a good communication state, that is, when ID exchange can be realized, the mobile phone The telephone terminal performs normal operation. On the other hand, when the ID cannot be exchanged, that is, when the communication state deteriorates or the communication is disconnected, the use of some functions of the mobile phone terminal is restricted. In other words, good communication is possible if the communication distance between the mobile phone terminal and the wireless card is short, and the distance between the mobile phone terminal and the wireless card uses the characteristic of wireless communication that the communication state deteriorates as the communication distance increases. Can be used to limit the function.

  FIG. 27 shows an example of state transition in the conventional terminal function restriction. In FIG. 27, there are states of “page / page scan mode”, “normal connection mode”, and “low power consumption mode”.

  In the “page / page scan mode”, the wireless card side performs transmission processing of the transmission signal, and the mobile phone terminal side detects the transmission signal and tries to connect the wireless card and the mobile phone terminal. Of course, the mobile phone terminal side can perform transmission processing, and the wireless card side can detect the transmitted signal.

  In the “normal connection mode”, the authenticity of the connected partner is confirmed, and if there is no problem, processing for shifting to low power consumption communication processing is performed. It is also in this state during a voice call on a mobile phone terminal.

  In the “low power consumption mode”, packets are intermittently exchanged with the connection partner to check whether the wireless connection between the wireless card and the mobile phone terminal is maintained.

A procedure for restricting the use of the function of the mobile phone terminal using the above three states will be described.
1) In the “normal connection mode” and “low power consumption mode” states, if a predetermined packet cannot be received for a certain period of time, the connection between the mobile phone terminal and the wireless card is disconnected as an abnormal connection or a failure (Abnormal Link Loss). (Abnormal disconnection).
2) Furthermore, when this abnormal disconnection is detected, a lock timer is started. The lock timer is defined as the time from when the connection abnormality occurs until the function restriction of the mobile phone terminal is performed.
3) After abnormal disconnection, the state shifts from the “normal connection mode” or “low power consumption mode” to the “page / page scan mode” state, and the mobile phone terminal or the wireless card tries to reconnect (paging).
4) If the paging is successful within the lock timer time, the lock timer is reset, the mode is changed to the “normal connection mode”, and the operation from the above 1) is repeated.
5) Here, when paging is not successful within the lock timer time, a function restriction (lock) is applied to the mobile phone terminal. When this function restriction is applied, if paging is not successful within a certain period of time after the lock timer is activated, an alarm is sounded from the wireless card (warning mode), and the mobile phone terminal Function restriction may be performed.
6) Here, once the function restriction is applied to the mobile phone terminal, the function restriction of the mobile phone terminal is not lifted unless reconnection succeeds by paging (in this case, transition from the paging to the normal connection mode).

By the above method, for example, when a user wears a wireless card and leaves the mobile phone terminal while leaving only the mobile phone terminal somewhere, the communication state deteriorates due to loss of free space, etc. Packet detection becomes difficult, eventually a connection error occurs, and the mobile phone terminal is instructed to limit its functions. Thereby, when the wireless card is away from the mobile phone terminal by a certain distance, it is possible to limit the function of the mobile phone terminal. Furthermore, after the function restriction is applied, the function restriction can be automatically released when reconnection is possible. In this way, the security function of the mobile phone terminal can be operated without the user being aware of it.
JP 2001-352579 A JP 2001-358827 A

  However, since the transmission power at the time of conventional wireless communication is always constant, for example, when the mobile phone terminal and the wireless card are some distance away, the transmission power is set to detect abnormal disconnection (Abnormal Link Loss) If the distance is a certain distance, the function restriction is applied, but the applied function restriction is also released at approximately the same distance. As a result, even when the mobile phone terminal is away from the wireless card, the function restriction is released, and there is a possibility that it is misused by others.

  In addition, it is preferable that a device such as a wireless card used in a pair with a mobile phone terminal is less time-consuming for daily use, but in practice, data for authentication is always exchanged with the mobile phone terminal. As a result, a relatively large amount of power is consumed, so that there is a problem that charging and replacement of the battery are frequently required, and it takes time and effort to function as an authentication device.

  In view of such a point, the present invention makes it possible for a communication terminal device such as a mobile phone terminal to have a function restriction at a location away from the wireless key device that restricts the operation of the communication terminal device by a certain distance. After being applied, the purpose is to prevent the function restriction from being released until the communication terminal device exists in the vicinity of the wireless key and to reduce power consumption.

  In order to solve the above problems and achieve the object, the present invention is a system including a communication terminal device and a wireless key device capable of wireless communication with the communication terminal device using a predetermined wireless communication method, The communication terminal device includes a communication unit that transmits and receives a radio signal using a predetermined wireless communication method, a state determination unit that determines a wireless state of a wireless signal received by the communication unit, and a wireless state that is determined by the state determination unit. The wireless key device includes a communication unit that transmits and receives a radio signal using a predetermined wireless communication method, and a state determination that determines a wireless state of the wireless signal received by the communication unit. And a transmission power changing unit that changes the transmission power of the radio signal transmitted by the communication unit. The control unit of the communication terminal device performs a predetermined function when the state determination unit determines that the wireless state of the wireless signal transmitted from the wireless key device with the first transmission power is worse than the predetermined communication state. After limiting and limiting a predetermined function, the wireless state of the wireless signal transmitted from the wireless key device with the second transmission power smaller than the first transmission power is better than the predetermined communication state by the state determination unit. When it is determined, the restriction on the restricted predetermined function is released.

  According to such a configuration, the communicable distance is controlled according to the situation by using the fact that the communicable distance between the communication terminal device and the wireless key device changes depending on the magnitude of the transmission power output from the communication means, for example. To do. In other words, when performing connection confirmation processing between the communication end device and the wireless key device, when canceling the function restriction over the transmission power of the wireless signal from at least one of the devices than the transmission power when the function restriction is applied And the release of the function restriction is determined by determining whether the wireless state is good or bad from the wireless signal received on the receiving side. Further, preferably, after the function restriction is released, the wireless signal is raised to the original transmission power when the function restriction is applied again, and the function of the function is determined by determining whether the wireless state is good or not from the wireless signal received on the receiving side. Determine limits.

  By doing so, the communication terminal device is restricted in function at a location away from the wireless key device by a certain distance, and the function is not restricted in a familiar range (for example, a distance where the user can directly operate the telephone terminal device). Furthermore, once the function restriction is applied, the function restriction is not released until the communication terminal device is in a familiar range, and the function restriction is automatically released when the user can operate it directly. Can do.

  According to the present invention, when the communication terminal device and the wireless key device are separated from each other by a certain distance, the function restriction of the communication terminal device is applied. Once the function restriction is applied, the function restriction is released until the communication terminal device exists in the vicinity of the user. However, since the function restriction is automatically released when the user can operate the distance, the reliability of the security of the communication terminal device and the usability of the function restriction function are improved.

  Further, by reducing the transmission power in reconnection in a state where the function restriction is imposed on the communication terminal device, there is an effect that the power consumption can be reduced as compared with the case of the conventional constant transmission power.

Hereinafter, an example of an embodiment of the present invention will be described with reference to FIGS.
In this example, a wireless key device that performs wireless communication with a mobile phone terminal device is prepared, and security lock of the mobile phone terminal device is performed in the wireless communication state of both.

  FIG. 1 is a diagram showing an example of the apparatus of this example. A wireless key device 50 separate from the cellular phone terminal device 10 is prepared. In this example, the wireless key device 50 is configured to be smaller than the cellular phone terminal device 10 and has a small shape that the user can always wear, such as being lowered to the user's neck with a neck strap 50a. The wireless key device 50 is provided with a light emitting unit 55 and an operation unit 59 (in the form of a push button in FIG. 1), and a terminal unit 56 for connection with the mobile phone terminal device 10 is prepared.

  As the mobile phone terminal device 10, an example of the shape of a general mobile phone terminal is shown here, and an antenna 11 for wireless telephone communication, a speaker 14, a microphone 15, a display unit 16, and an operation unit (operation key) 17. The light emitting unit 22 is disposed. In addition, a terminal unit 23 for connection with the wireless key device 50 is prepared. The terminal unit 23 may use an existing terminal prepared for connecting the mobile phone terminal device 10 to a charger or various external devices. In addition, as a display on the display unit 16, for example, a security display 16a indicating that it is operating in a state where security described below is secured, or that a security lock whose operation is restricted by the security function is applied. Display (not shown) may be performed.

  Next, a configuration example of the mobile phone terminal device 10 of this example will be described with reference to FIG. The cellular phone terminal device 10 of this example includes a radio telephone communication antenna 11 for performing radio communication with a radio telephone base station, and the antenna 11 is connected to a communication circuit 12 for radio telephone communication. Wireless communication is performed with the base station under the control of the control unit 19. When communication for communication is performed by the communication circuit 12, the received audio data is supplied to the audio data processing unit 13 to receive the audio data, and then supplied to the speaker 14 for output, and the microphone 15 Is sent to the communication circuit 12 to be transmitted.

  The mobile phone terminal device 10 includes a display unit 16 configured with a liquid crystal display or the like, and an operation unit 17 configured with operation keys. The display unit 16 can display a mail text, a screen for accessing the web, and the like, and the operation unit 17 can perform input operations such as a telephone number and a mail text, and various mode settings.

  Each block in the terminal device 10 is connected to the control unit 19 or the like via the control line 25 and is configured to be able to transfer data via the data line 26, and stores necessary data in the memory 18. I am trying to make it. The memory 18 may store not only data necessary for the mobile phone terminal but also data necessary for the IC card function unit 40 described later. The memory 18 holds a program for realizing the security function and data necessary for executing the security function.

  In addition, in order to receive an incoming call to the terminal device 10 via a telephone line and various warnings, a vibration unit 21 configured by a vibration motor that vibrates the terminal itself, and a light emitting unit 22 configured by a light emitting diode or the like. And performing vibration and light emission under the control of the control unit 19. The vibration unit 21 and the light emitting unit 22 are used as notification means for notifying incoming calls and the like as a mobile phone terminal, but are also used as warning means necessary for the security function. Note that as a warning means necessary for the security function, a warning sound may be output from the speaker 14 or the like when a sound is generated.

  The mobile phone terminal 10 of this example includes a communication circuit 32 for short-distance wireless communication separately from the communication circuit 12 for telephone communication, and is, for example, several m to a maximum of 100 m via a connected antenna 31. Wireless communication is performed with a partner within a relatively narrow range (however, a communication range is narrowed when communicating with a wireless key device, which will be described later, at normal times). Here, for example, a short-range wireless communication system called Bluetooth (trademark) is applied. In this short-range wireless communication, for example, communication with a headset for hands-free calling is performed, or communication with a personal computer device is performed, and data communication from the computer device is performed via the mobile phone terminal device 10. Various applications are envisioned. As a frequency band used for the wireless communication, for example, a 2 GHz band is used, and there is a frequency band or a modulation method that does not interfere with the wireless telephone communication in the communication circuit 12. Communication with the communication circuit 32 for distance wireless communication can be performed simultaneously.

  In the case of this example, wireless communication with the wireless key device 50 is performed using the communication circuit 32 for near field communication. However, wireless communication is possible with devices (headsets, personal computer devices, etc.) other than the wireless key device 50 as long as the communication devices have the same communication method. Further, when executing the security function, the wireless key device 50 that performs wireless communication by the communication circuit 32 is limited to one specific device, and the identification ID of the device is registered in the memory 18 or the like in advance. Yes. The registration information about the wireless key device 50 may not be modified by the user.

  The transmission amplifier 33 that amplifies the transmission signal in the communication circuit 32 is configured such that the transmission power is set in a plurality of stages under the control of the control unit 19 and the like. The low transmission power in the stage is set. In a state where it is connected to a device other than the wireless key device 50, a relatively high level of transmission power is set. In addition, when connected wirelessly to a device incorporating a function as a wireless key device, such as a headset to be described later, the operation state of the counterpart device at that time (that is, it operates only as a wireless key device). Or whether another combined function is operating or not), the transmission power is set. A specific processing example for setting the transmission power will be described later.

  Further, the cellular phone terminal 10 of this example includes a non-contact IC card function unit 40. The non-contact IC card function unit 40 includes a billing data control unit 41 to which an antenna 42 is connected, and performs close proximity wireless communication with a reader / writer at a very close distance of about several centimeters. When performing this close proximity wireless communication, it is possible to operate the accounting data control unit 41 with power obtained by receiving radio waves from the reader / writer side. The billing data control unit 41 is operated by the power supplied from the power circuit 24.

  The billing data control unit 41 reads data necessary for billing and authentication from the memory 18 (or a memory (not shown in the billing data control unit 41)) when executing the IC card function, and performs proximity wireless communication with the reader / writer. To communicate. For example, when functioning as a ticket for transportation, data such as a valid section, valid period, or charge amount that can be withdrawn as a ticket, or this terminal (IC card) The billing data control unit 41 sends personal information and the like regarding the owner of the cardholder to the reader / writer for billing processing and authentication processing. When it is used as an employee ID card, membership card, payment card, credit card, etc., information necessary for the authentication is also exchanged.

  Furthermore, the cellular phone terminal device 10 of the present example includes a terminal unit 23 and is configured such that various peripheral devices, data processing devices, and the like (not shown) can be directly connected using the terminal 23. In this case, the power supply circuit 24 having a built-in secondary battery for supplying power to each unit in the mobile phone terminal device 10 can supply power to an external device connected by the terminal unit 23. For example, as indicated by a broken arrow J in FIG. 1, when the terminal portion 56 of the wireless key device 50 is directly connected to the terminal portion 23 of the mobile phone terminal device 10, the power supply in the mobile phone terminal device 10 is A charging current is supplied from the circuit 24 to the secondary battery in the wireless key device 50 so as to be charged. Further, when the wireless key device 50 is directly connected to the terminal unit 23 of the mobile phone terminal device 10, the control unit 19 of the mobile phone terminal device 10 detects this and performs security processing (for example, Security processing (executed without short-range wireless communication, which will be described later) is performed.

  Next, the configuration of the wireless key device 50 that performs wireless communication with the mobile phone terminal device 10 of this example will be described with reference to FIG. The wireless key device 50 of this example includes a communication circuit 52 for short-range wireless communication, and wirelessly communicates with a partner within a relatively narrow range of, for example, several meters to a maximum of about 100 meters via a connected antenna 51. (However, when communicating with the mobile phone terminal device 10 at normal time, the communication range is narrowed). Here, the wireless key device 50 is also applied to the Bluetooth method which is a short-range wireless communication method provided on the mobile phone terminal device 10 side. The other party who performs wireless communication with the communication circuit 52 is limited to one registered mobile phone terminal device 10, and the identification ID of the device is registered in advance. The registration information about the mobile phone terminal device 10 may not be corrected by the user.

  Wireless communication in the communication circuit 52 is executed under the control of the control unit 53. In this case, the transmission amplifier 52a that amplifies the transmission signal in the communication circuit 52 is configured such that the transmission power is set in a plurality of stages under the control of the control unit 53 and the like, and is wirelessly connected to the mobile phone terminal 10 Then, a low transmission power in a plurality of stages is set. However, when the control unit 53 detects that the operation unit 59 (such as the button-shaped operation unit shown in FIG. 1) disposed in the wireless key device 50 is operated, the transmission is temporarily transmitted by the transmission amplifier 52a. A process for increasing the power is performed.

  The wireless key device 50 of this example includes a warning sound generation unit 54 to which a speaker 54 a that outputs a warning sound is connected, and a light emitting unit 55 configured by a light emitting diode or the like. Output, vibration and light emission. These warning sound generation unit 54 and light emitting unit 55 are used as warning means necessary for the security function. The light emitting unit 55 also functions as a display unit that displays the current security mode in a state where the security function is activated by performing wireless communication with the mobile phone terminal device 10. Specifically, for example, when the light emitting unit 55 is blinking in green, the normal mode is displayed. When the light emitting unit 55 is blinking in red, the warning mode is displayed, and the function restriction mode is set. When the display is switched such that nothing is lit, it is also made to function as a display means for displaying the security mode. The display means for displaying the security mode may use a liquid crystal display or the like to perform display in which the mode is directly understood by characters or figures. Moreover, it is good also as a warning means to warn by vibration.

  The control unit 53 and each unit are connected by a control line 58. Under the control of the control unit 53, wireless communication in the communication circuit 52, operation in the warning sound generation unit 54 and the light emitting unit 55, and the like are executed. The

  In addition, the wireless key device 50 of this example includes a terminal portion 56, and the mobile phone terminal device 10 can be directly connected using the terminal 56. At the time of this connection, the control unit 53 in the wireless key device 50 directly performs data transfer with the control unit 19 in the mobile phone terminal device 10 to perform security processing at the time of direct connection without performing short-range wireless communication. It is. When the remaining charge of the secondary battery built in the power circuit 57 in the wireless key device 50 is small, the secondary battery in the power circuit 57 is charged with the charging current supplied from the mobile phone terminal device 10 side. Can be charged.

  When using the cellular phone terminal device 10 and the wireless key device 50 configured as described above, the user always wears the wireless key device 50 as shown in FIG. When the user uses the mobile phone terminal 10, the function is not restricted (normal mode described later). When the user always puts the wireless key device 50 in a state where the mobile phone terminal device 10 is placed somewhere away from the mobile phone terminal device 10, the wireless key device 50. If a warning operation is performed (warning mode to be described later) and the warning operation is performed and the mobile phone terminal device 10 is not approached, the function of the mobile phone terminal device 10 is limited ( (Function restriction mode described later). Note that the warning operation in the warning mode may be performed only on the mobile phone terminal device 10 side. Alternatively, the warning operation in the warning mode may be performed by both the wireless key device 50 and the mobile phone terminal device 10.

  As a state in which the function of the mobile phone terminal device 10 is restricted in the function restriction mode, for example, all the functions of the mobile phone terminal device 10 may be stopped (however, communication related to the security function is not restricted). Only a part of the functions of the terminal device 10 may be stopped. Specifically, for example, only processing using the non-contact IC card function unit 40 may be restricted. In addition, display of personal information such as address book browsing or mail browsing of the mobile phone terminal device 10 may be restricted. In addition, it may be possible to restrict incoming calls as a wireless telephone so that only incoming calls can be made. When the outgoing call is restricted, only the telephone number for emergency calls such as the police may be restricted. Further, only the function as the wireless telephone device may be restricted, and the processing using the non-contact IC card function unit 40 may not be restricted.

  Although the wireless key device 50 described so far is configured as a dedicated device that performs only the security function, the function as the wireless key device may be incorporated in a device having other functions. For example, a wireless key device may be incorporated into a headset for performing a so-called hands-free call by performing wireless communication with the mobile phone terminal device 10 via Bluetooth.

  FIG. 5 is a diagram showing a configuration example of the headset with the wireless key. The headset 60 with a wireless key of this example includes a communication circuit 62 for short-range wireless communication, and is connected to a partner within a relatively narrow range of, for example, several meters to a maximum of about 100 meters via a connected antenna 61. Perform wireless communication. Here, the Bluetooth system which is the same system as the short-range wireless communication system provided on the mobile phone terminal device 10 side is applied to the communication circuit 62 of the headset with the wireless key. The other party who performs wireless communication with the communication circuit 62 is limited to one specific registered mobile phone terminal device 10, and the identification ID of the device is registered in advance. However, when only the headset is used, the communication circuit 62 may not limit the other party with which wireless communication is performed.

  Wireless communication in the communication circuit 62 is executed under the control of the control unit 63. In this case, the transmission amplifier 62a that amplifies the transmission signal in the communication circuit 62 is configured such that the transmission power is set under the control of the control unit 63 and the like.

  When communication for the headset is performed by the communication circuit 62 (that is, communication of voice data for a call), the received voice data is supplied to the voice data processing unit 66 to perform voice data reception processing and then to the speaker 67. The audio data for transmission, which is picked up by the microphone 68 and processed by the audio data processing unit 66, is supplied to the communication circuit 62 for transmission.

  In addition, the wireless keyed headset 60 of the present example includes an operation unit 64 configured with operation keys and the like, a memory 65, and a light emitting unit 70. The light emitting unit 70 is used as a warning unit for the security function, and is also used as a display unit for an operation state when functioning as a headset. Each unit in the headset 60 can exchange control data via the control line 73 and can exchange voice data via the data line 74.

  The wireless keyed headset 60 of this example includes a terminal portion 71, and the mobile phone terminal device 10 can be directly connected using the terminal 71. At the time of this connection, the control unit 63 in the headset 60 with the wireless key directly performs data transfer with the control unit 19 in the mobile phone terminal device 10 to directly transfer voice data or perform security processing without performing short-range wireless communication. To do. When the remaining charge of the secondary battery built in the power circuit 72 in the wireless keyed headset 60 is low, the charging current supplied from the mobile phone terminal device 10 side is used to store the secondary battery in the power circuit 72. The secondary battery can be charged.

  When such a headset 60 with a wireless key is prepared, as shown in FIG. 6, for example, a user wearing the headset 60 with a wireless key can keep the mobile phone terminal device in a bag or the like. 10 is capable of making a so-called hands-free call by using wireless communication with the mobile phone 10 and using a function as a wireless key device to warn by the positional relationship (distance) between the wireless keyed headset 60 and the mobile phone terminal device 10. Perform operations and function restriction operations. That is, when the mobile phone terminal device 10 is separated from the wireless keyed headset 60 by a certain distance, a warning operation is performed from the wireless keyed headset 60 or the mobile phone terminal device 10 (or both) (warning mode described later). If the warning operation is performed and the mobile phone terminal device 10 is not approached, the function of the mobile phone terminal device 10 is restricted (function restriction mode described later).

  Next, a processing example when the mobile phone terminal device 10 and the wireless key device 50 having such a configuration are prepared and security processing is performed will be described. The security process when using the wireless keyed headset 60 is basically the same, but in the following description, the wireless key device 50 is used.

  First, a security processing mode (hereinafter referred to as “security mode”) will be described with reference to FIG. In the case of this example, a warning that warns that the normal mode M1 that does not restrict the function of the mobile phone terminal device 10 and that the mobile phone terminal device 10 and the wireless key device 50 are out of the normal mode due to the distance between the mobile phone terminal device 10 and the wireless key device 50 is separated Function restriction that restricts the function of the mobile phone terminal device 10 when the mode M2 does not return from the warning mode to the normal mode (that is, when the distance between the mobile phone terminal device 10 and the wireless key device 50 remains large). Mode M3 is provided.

  As transitions of these modes, as indicated by arrows in FIG. 7, there are a change from the normal mode M1 to the warning mode M2, a change from the warning mode M2 to the function restriction mode M3, and the function restriction mode M3 is set. When the wireless key device 50 approaches the mobile phone terminal device 10 in the state, the mode returns to the normal mode M1. Further, when the wireless key device 50 approaches the mobile phone terminal device 10 in a state where the warning operation is performed in the warning mode M2, the mode returns to the normal mode M1.

  In the case of this example, these security modes are associated with a communication mode prepared in the Bluetooth method, which is a wireless communication method between the mobile phone terminal device 10 and the wireless key device 50. That is, FIG. 8 shows a communication mode in the wireless communication system (Bluetooth system) of this example. A connection mode M11 in which both the mobile phone terminal device 10 and the wireless key device 50 authenticate a partner device and connect wirelessly. In the connection mode M11, when the mutual authentication is completed and the connection is established, the data transfer mode M12 in which the payload data is actually transferred is set. When the data transfer in the data transfer mode M12 is completed, the mode shifts to the low power consumption communication mode M13. In the low power consumption communication mode M13, both wireless communication is intermittently performed at a cycle longer than the communication cycle in the data transfer mode M12, and the wireless connection between both is maintained. As described above, since the period of intermittent communication is long, the power consumption required for communication can be reduced and the power consumption can be reduced as compared with the case of operating in the data transfer mode M12. Note that the low power consumption here indicates that the power consumption is reduced by thinning out the communication cycle, and is not directly related to the process of reducing the transmission power described later (however, as described later, the low power consumption mode Some of them are designed to reduce the transmission power).

  In the state of the low power consumption communication mode M13, when the data transfer between the two is resumed, the process returns to the connection mode M11, the process of resuming the communication in the connection mode M11 is performed, and the actual data transfer is performed. The data transfer mode M12 is set. In the state where the wireless connection is maintained in the low power consumption communication mode M13, the connection process in the connection mode M11 is relatively easily performed, and the data transfer in the data transfer mode M12 is resumed as compared with the case where the wireless connection is performed again. Can be done quickly.

  Further, when connection processing is not performed with any communication partner in the connection mode M11 (or when connection is not possible), each device shifts to the standby mode M14. The device that has entered the standby mode M14 performs intermittent reception or transmission in a very long cycle, and performs a process of searching for a communication device as a counterpart. Note that the device that has entered the standby mode M14 may be prevented from returning to the connection mode M11 unless there is any triggering process such as a user operation. In addition, while communicating between two devices, the two devices are basically set to the same mode. That is, at least the connection mode M11, the data transfer mode M12, and the low power consumption mode M13 are modes in which the two devices are shifted in synchronization.

  Here, in the case of this example, as shown in FIG. 8, when the mobile phone terminal device 10 and the wireless key device 50 are communicating in the low power consumption communication mode M13, the security mode is set. The normal mode M1 is set, and the warning mode is started when the communication mode shifts from the low power consumption communication mode M13 to the connection mode M11. Although details of the process of shifting from the warning mode to the function restriction mode will be described later, when the security mode is the function restriction mode M3, the function restriction mode M3 is maintained during the connection mode M11, the data transfer mode M12, and the standby mode M14. Leave. The security mode returns from the function restriction mode M3 to the normal mode M1 only when the data transfer mode M12 shifts to the low power consumption communication mode M13.

  Next, processing for selecting a security mode in each of the mobile phone terminal device 10 and the wireless key device 50 will be described with reference to FIG. This security mode selection process is executed under the control of the control units 19 and 53 of the respective devices, for example. First, it is determined whether or not the current communication mode is a low power consumption communication mode (step S1). Here, in the low power consumption communication mode, the state timer prepared in the control unit is reset (step S2), the security mode is set to the normal mode (step S3), and the process as the normal mode (ie, The mode is operated as a mode in which the function is not limited) (step S4). The state timer is a timer that counts up over time.

  When it is determined in step S1 that the communication mode is not the low power consumption communication mode, it is determined whether or not the immediately preceding (current) security mode is the normal mode (step S5). Is started (step S6), the start of the warning mode is set (step S7), and the warning operation as the warning mode is executed (step S8). If only one of the mobile phone terminal device 10 and the wireless key device 50 is configured to perform a warning operation, the other device does not perform any particular processing during this warning mode.

  If it is determined in step S5 that the immediately previous (current) security mode is not the normal mode, it is determined whether or not the count value of the state timer activated in step S6 exceeds a predetermined value TH ( Step S9). Until the count value exceeds the predetermined value TH1, the warning mode of step S8 is maintained, and when the count value exceeds the predetermined value TH1, the security mode is changed to the warning mode (step S10). The time until the count value of the state timer exceeds the predetermined value TH1 from the start of counting is, for example, about several seconds to several tens of seconds.

  Next, specific examples of communication states in each communication mode in each of the mobile phone terminal device 10 and the wireless key device 50 will be described with reference to FIG. First, an example will be described in which the mobile phone terminal device 10 and the wireless key device 50 perform authentication processing of the other party in the connection mode. When wireless communication is performed using the Bluetooth method, one of the two devices performing communication is a master device, and the other communication device is a slave device. On the Bluetooth system, any device may be a master or a slave. In this example, when wireless communication is performed between the mobile phone terminal device 10 and the wireless key device 50, a wireless key is used. The device 50 is a master and the mobile phone terminal device 10 is a slave.

  The device (in this case, the mobile phone terminal device 10) that is a slave performs a scan process for searching for a master in the connection mode. FIG. 10 is a flowchart showing an operation example during the scan process. At the time of the scan process, a process of continuously receiving for a certain period and searching for a signal from the master is performed (step S11). In the scanning process, it is determined whether or not a signal (page signal) to which the ID number of the wireless key device 50 that is a partner performing the security process has been received is received (step S12). Here, when the signal to which the ID number of the wireless key device 50 is assigned cannot be received, after shifting to the idle process and waiting for a certain period (step S13), the process returns to step S11 and the scan process is repeated.

  If it is determined in step S12 that the page signal assigned with the ID number of the wireless key device 50 has been received, a response signal to the page signal is transmitted (step S14), connection processing with the master is performed, Transition to the communication state (that is, shift to the data transfer mode) (step S16).

  In addition, when the connection mode starts, the master device (in this case, the wireless key device 50) starts a standby timer (step S21) and transmits a page signal on a predetermined channel for a predetermined period (step S22). ). For example, an ID number set for the own device is assigned to the page signal at this time, and the ID number of the communication partner is assigned. Then, it is determined whether or not there is a response from the slave after the transmission of the page signal (step S23). If there is no response, it is determined whether or not the count value of the standby timer has exceeded a predetermined time TH2 (step S23). Step S24). If the count value of the standby timer does not exceed the predetermined time TH2, after shifting to the idle process and waiting for a certain period (step S25), the process returns to step S22 and the page signal transmission process is repeated.

  If it is determined in step S23 that there is a response from the slave, connection processing with the slave is performed and the communication state is changed (that is, the data transfer mode is changed) (step S27). If the count value of the standby timer exceeds the predetermined time TH2 in step S24, the standby state is entered (step S28), and the process of trying to connect with the slave here is stopped.

  FIG. 12 shows a master device (wireless key device 50) on which the process of the flowchart of FIG. 11 is performed and a slave device (mobile phone terminal device 10) on which the process of the flowchart of FIG. It is the figure which showed the example of the communication state with). 12A shows the transmission timing and idle period of the page signal of the master (wireless key device 50), and FIG. 12B shows the reception (scanning) timing and idle period of the slave (mobile phone terminal device 10). Is shown. As shown in FIG. 12, the idle period on the transmission side is different from the idle period on the reception side, and the page signal transmitted at any timing can be received on the reception side.

  FIG. 13 shows the processing of FIG. 12 in a sequence diagram. As shown in FIG. 13, the wireless key device 50 intermittently transmits page signals (timing T11, T12, T13). Here, when there is a response to the page signal (timing T14), there is also a mutual exchange of responses between the two devices (timing T15, T16), and then a mutual exchange of connection signals for wireless connection is performed. Then (timing T17, T18), the mode shifts to the data transfer mode.

  Next, a processing example when each device of this example shifts to the data transfer mode will be described with reference to a flowchart of FIG. When the mode is shifted to the data transfer mode, an authentication process is performed on the channel through which the data transfer is performed (step S31), and it is determined whether or not the authentication is correctly completed (step S32). If the authentication process is not completed here, the process returns to the connection process.

  When the connection process in step S32 is completed, data transfer is normally performed. However, in the security process of this example, a process for directly shifting to the low power consumption mode is performed without performing the data transfer. (Step S33). Then, it is determined whether or not the mode can be shifted to the low power consumption mode (step S34). If the mode can be shifted to the low power consumption mode, the sniff state of the low power consumption mode is set. If the mode cannot be shifted to the low power consumption mode, the process returns to the connection process.

  FIG. 15 is a sequence diagram showing an example of the communication state shown in the flowchart of FIG. That is, in the data transfer mode, packets are transmitted to each other in order to perform authentication (timing T21, T22, T23, T24), and data for shifting to the low power consumption mode after the authentication is completed ( By sending a sniff mode request) from the master (wireless key device 50) (timing T25) and receiving the acknowledgment (timing T26), both devices shift to the low power consumption mode (sniff mode).

  FIG. 16 is a flowchart showing an example of processing in the slave (mobile phone terminal device 10) in the low power consumption mode (sniff mode). Explaining the process, when the sniff mode is entered, a timer is first started (step S41), and a scan process for receiving a signal from the master is performed (step S42). In the scanning process, it is determined whether or not a signal (page signal) to which the ID number of the wireless key device 50, which is a security processing partner, is given is received (step S43). Here, when the signal with the ID number of the wireless key device 50 is received, a response signal to the page signal is transmitted (step S44), and the timer started in step S41 is reset (step S45). Then, the process proceeds to the idle period (step S46). When the fixed idle period has elapsed, the process returns to the scan process in step S42. Here, in the case of this example, the idle period (period in which communication is not performed) in step S46 is set to a relatively long period, and is synchronized with the idle period on the master side. .

  If it is determined in step S43 that the signal assigned the ID number of the wireless key device 50 cannot be received, it is determined whether or not the timer started in step S41 has exceeded a predetermined value T_SV (step S47). If the predetermined value T_SV is not exceeded, the process proceeds to an idle process in step S46. If it is determined in step S47 that the predetermined value T_SV has been exceeded, the communication mode is changed to the connection mode (step S48). When changing the communication mode to the connection mode, the transmission power of the transmission amplifier may be changed higher.

  FIG. 17 is a flowchart showing an example of processing in the master (wireless key device 50) in the low power consumption mode (sniff mode). Explaining the process, when the sniff mode is entered, a timer is first started (step S51), and a process of transmitting a page signal for a predetermined period is performed (step S52). After the transmission of this page signal, it is determined whether or not a response has been received from the partner (mobile phone terminal device 10) that performs the security process (step S53). Here, when the response signal is received, the timer started in step S51 is reset (step S54), and the process proceeds to the idle period (step S55). When the fixed idle period has elapsed, the process returns to the scan process in step S52. Here, in the case of this example, the idle period (period in which communication is not performed) in step S55 is set to a relatively long period and is synchronized with the idle period on the slave side.

  If it is determined in step S53 that the response from the mobile phone terminal 10 cannot be received, it is determined whether or not the timer started in step S51 has exceeded a predetermined value T_SV (step S56), and the predetermined value T_SV. If not exceeded, the process proceeds to an idle process in step S55. If it is determined in step S56 that the predetermined value T_SV has been exceeded, the communication mode is changed to the connection mode (step S57). When changing the communication mode to the connection mode, the transmission power of the transmission amplifier may be changed higher.

  FIG. 18 is a sequence diagram showing communication timings in both devices in the low power consumption mode (sniff mode). As shown in FIG. 18, the timing at which the sniff process at the master is performed (the portion described as ON) and the timing at which the sniff process at the slave is performed substantially coincide. That is, the timing (T31, T33, T35, T37) at which the polling packet is transmitted from the master matches the period during which the slave receives the polling packet, and each polling packet is received by the slave and the response (timing T32). , T34, T36, T38) are also received on the master side. By performing intermittent bidirectional communication in this way, the low power consumption mode is maintained, and the wireless connection state between the master and the slave is maintained.

  When the communication mode is in the standby state, for example, the processing shown in the flowchart of FIG. 19 is performed. That is, when the standby state is entered, the activation timer is set to be activated (step S61), the activation timer is started (step S62), and the communication circuit is set to the sleep state (step S63). Thereafter, when the period set by the activation timer elapses, the communication circuit is activated (step S64), the connection process is executed, and the process proceeds to a process for determining whether there is a device that can be connected.

  By executing the processing described so far, short-distance wireless communication is performed between the mobile phone terminal device 10 and the wireless key device 50, and the mobile phone terminal device 10 and the wireless key device 50 come close to each other. If the wireless communication can be satisfactorily performed in the state, the mobile phone terminal device 10 and the wireless key device 50 are maintained in a wireless connection state in the low power consumption mode. In the wireless connection state in this low power consumption mode, data serving as a so-called payload is not transferred, and only a signal for maintaining the wireless connection is intermittently transmitted and received, and an idle period is appropriately selected. Therefore, communication can be performed with very little power consumption. Therefore, the power consumption by performing the security processing of this example can be reduced, and the battery duration time of both the mobile phone terminal device 10 and the wireless key device 50 can be extended. This is particularly effective for a wireless key device that is desired to be made as small as possible.

  As for the mobile phone terminal device 10, security processing is performed by applying a Bluetooth short-range wireless communication method that has already been incorporated into a mobile phone terminal. The security processing of this example can be realized by slightly changing the control configuration of the mobile phone terminal provided with the distance wireless communication circuit, and a good security function can be easily realized.

  In the above-described embodiment, the transition from the low power consumption mode to the connection mode is simply processed based on whether or not wireless communication is possible between the two units (that is, based on connection / disconnection or signal strength of communication). However, it may be determined based on the detection status of packets from the other party. 20 to 22 are diagrams showing examples of processing in that case.

  First, the processing example in the slave (mobile phone terminal device 10) is shown in the flowchart of FIG. 20. When the mobile phone terminal device 10 enters the low power consumption mode (sniff mode), a timer is started (step S71), and the communication state Is set as good (step S72), and scan processing for receiving a signal from the master is performed (step S73). In the scanning process, it is determined whether or not a signal (page signal) to which the ID number of the wireless key device 50 that is the partner performing the security process has been received is received (step S74). Here, when the signal with the ID number of the wireless key device 50 is received, a response signal to the page signal is transmitted (step S75), and the timer started in step S71 is reset (step S76). The process moves to the idle period (step S77). When the fixed idle period has elapsed, the process returns to the scan process in step S73. This idle period is synchronized with the idle period on the master side.

  If it is determined in step S74 that the signal assigned with the ID number of the wireless key device 50 cannot be received, it is determined whether or not the timer started in step S71 has exceeded the first predetermined value T_SV1 (step S78). ), If the predetermined value T_SV1 is not exceeded, the process proceeds to the idle process of step S77. If it is determined in step S78 that the predetermined value T_SV1 has been exceeded, it is further determined whether or not the second predetermined value T_SV2 has been exceeded (step S79). The second predetermined value T_SV2 is a period longer than the first predetermined value T_SV1. Here, when it is determined that the second predetermined value T_SV2 has not been exceeded, a failure is set as the communication state (step S80), and the process proceeds to an idle process in step S77. If it is determined in step S79 that the second predetermined value T_SV2 has been exceeded, the communication mode is changed to the connection mode (step S81).

  Next, an example of processing in the master (wireless key device 50) will be described with reference to the flowchart of FIG. 21. When the sniff mode is entered, a timer is first started (step S91) and good is set as the communication state. Then, a process of transmitting a page signal for a predetermined period is performed (step S93). After the transmission of this page signal, it is determined whether or not a response has been received from the other party (mobile phone terminal device 10) that performs security processing (step S94). Here, when the response signal is received, the timer started in step S91 is reset (step S95), and the process proceeds to the idle period (step S96). When the fixed idle period has elapsed, the process returns to the scan process in step S93. This idle period is synchronized with the idle period on the slave side.

  If it is determined in step S94 that a response from the mobile phone terminal device 10 cannot be received, it is determined whether or not the timer started in step S91 has exceeded a first predetermined value T_SV1 (step S97). If the predetermined value T_SV1 is not exceeded, the process proceeds to an idle process in step S96. If it is determined in step S97 that the predetermined value T_SV1 has been exceeded, it is further determined whether or not the second predetermined value T_SV2 has been exceeded (step S98). The second predetermined value T_SV2 is a period longer than the first predetermined value T_SV1. If it is determined that the second predetermined value T_SV2 has not been exceeded, a failure is set as the communication state (step S99), and the process proceeds to the idle process of step S96. If it is determined in step S98 that the second predetermined value T_SV2 has been exceeded, the communication mode is changed to the connection mode (step S100).

  Then, when processing is performed as shown in FIGS. 20 and 21, the security mode selection is set based on the judgment as shown in FIG. That is, it is first determined whether or not the communication mode is the low power consumption mode (step S101). If the communication mode is the low power consumption mode, whether or not the communication state set in the flowcharts of FIGS. 20 and 21 is good. Is determined (step S102). Here, when the communication state is good, the security mode is set to the normal mode (step S103). If the communication state is bad in step S102, the security mode is set to the warning mode (step S104). Furthermore, when it is determined in step S101 that the mode is not the low power consumption mode, the security mode is set to the function restriction mode (step S105).

  By processing as shown in the flowchart of FIG. 22, the warning mode is set when there is a high possibility of shifting from the low power consumption mode to the connection mode, and a good warning can be given when the wireless communication state deteriorates. it can.

  Next, an embodiment in which transmission power is controlled when reconnection processing is performed between the mobile phone terminal device 10 and the wireless key device 10 when a function restriction is applied to the mobile phone terminal device 10. explain.

  FIG. 23 shows an example of state transition when transmission power control is performed when the function is restricted. In FIG. 23, there are four states of “page / page scan (when the terminal is normal)”, “page / page scan (when the terminal is locked)”, “normal connection mode”, and “low power consumption mode”. The following four states will be described.

  “Page / page scan (when the terminal is normal)” corresponds to the connection mode M11 (see FIG. 8), and the mobile phone terminal device 10 is not yet functionally restricted. At this time, the wireless key device 50 detects transmission processing, and the mobile phone terminal device 10 detects a transmission signal from the wireless key device 50 and tries to connect the wireless key device 50 and the mobile phone terminal device 10. Of course, the mobile phone terminal 10 side may perform transmission processing, and the wireless key device 50 side may detect the transmitted signal.

  “Page / page scan (when the terminal is locked)” is a state in which the cellular phone terminal device 10 is restricted in function. The wireless key device 50 performs transmission processing, and the cellular phone terminal device 10 detects transmission signals. The wireless key device 50 and the mobile phone terminal device 10 are tried to be connectable. As described above, the mobile phone terminal device 10 side may perform transmission processing, and the wireless key device 50 side may detect signals.

  The “normal connection mode” corresponds to the transition period of the data transfer mode M12 (see FIG. 8) or the data transfer mode M12 to the low power consumption communication mode M13, and there is no problem by confirming the authenticity of the connected partner. For example, processing for shifting to low power consumption communication processing is performed. The mobile phone terminal device 10 is also in this state during a voice call.

  The “low power consumption mode” corresponds to the low power consumption communication mode M13 (see FIG. 8), and packets are intermittently transferred, and the wireless connection between the wireless key device 50 and the mobile phone terminal device 10 is maintained. Make sure.

The function restriction procedure of the mobile phone terminal device will be described using the above four states.
<Prerequisites>
0) It is assumed that arbitrary transmission power is set in the “normal connection mode” and “low power consumption mode” states. For example, the transmission power is adjusted so that abnormal disconnection occurs when the mobile phone terminal device and the wireless key device are separated by about 50 m. At this time, it is not always necessary to use this transmission power in both the mobile phone terminal device and the wireless key device. Only one of them may be adjusted to this transmission power. Here, it is assumed that the transmission power on the wireless key device side is adjusted.

  The distance between the mobile phone terminal device and the wireless key device is analyzed by the control units 19 and 53 of the respective devices based on the wireless state of the signals received by the short-distance communication circuits 32 and 52 of each device, for example, the signal strength. By doing so, it can be calculated. In addition, by comparing with a predetermined initial value given in advance, it can be determined whether the distance between the current mobile phone terminal device and the wireless key device is greater than or less than a predetermined distance.

<Flow from function restriction to function restriction release>
1) In the “normal connection mode” or “low power consumption mode” state, the user wears the wireless key device 50 and places only the mobile phone terminal device 10 somewhere, and the user places the mobile phone terminal device 10 When moving away from the network, the communication state deteriorates due to loss of free space, etc., and it becomes difficult to detect the packet transmitted by the partner device, and finally it becomes impossible to receive the packet. If the packet cannot be normally received for a certain period of time, both devices disconnect the connection between the cellular phone terminal device 10 and the wireless key device 50 as an abnormal connection or a connection failure (abnormal disconnection).
2) Furthermore, when this abnormal disconnection is detected, a lock timer is started. In this example, the lock timer is defined as the time from the occurrence of connection abnormality or connection failure until the function restriction of the mobile phone terminal device 10 is performed.

3) After abnormal disconnection, the mobile phone terminal device 10 or the wireless key device 50 tries to reconnect (paging) after shifting to the “page / page scan” state.
4) If the paging is successful within the lock timer time, the lock timer is reset, the mode is changed to the “normal connection mode”, and the operation from the above 1) is repeated.
5) Or, when paging is not successful within the lock timer time, the mobile phone terminal device 10 is function-limited (locked). Further, the transmission power of the wireless key device 50 is lowered. For example, the transmission amplifier 52a is set under the control of the control unit 53, and the transmission power on the wireless key device 50 side is lowered to a transmission power that can be connected only when the distance between the mobile phone terminal device 10 and the wireless key device 50 is within 1 m.
6) When the user approaches the mobile phone terminal device that the user has left behind and the mobile phone terminal device 10 and the wireless key device 50 (user) approach within 1 m, the connection can be made again.
7) When the mobile phone terminal device 10 and the wireless key device 50 are successfully connected, the function restriction of the mobile phone terminal device 10 is released. In order to limit the function again at 50 m, the transmission power of the wireless key device 50 is increased to the power at which the function is limited at 50 m.

  The transmission power control described above may be performed by only one of the wireless key device 50 and the mobile phone terminal device 10, or may be performed by both.

  With the above operation, the distance to which the function restriction is applied to the mobile phone terminal device 10 is restricted at a certain distance from the user (wireless key device 50), and the function is not restricted in the vicinity of the user. Further, once the function restriction is applied to the mobile phone terminal device 10, the function restriction is not released until the mobile phone terminal device 10 exists in the vicinity of the user. It becomes possible to cancel the function, and the usability and reliability of the function restriction function of the mobile phone terminal device 10 can be improved.

  FIG. 24 is a flowchart showing the transmission power control process of the wireless key device in the state transition shown in FIG. The first state is the normal connection mode (step S201). The authenticity of the connected partner is confirmed, and if there is no problem, processing for shifting to low power consumption communication processing is performed. It is also in this state during voice calls. It is determined whether there is no necessary processing such as a voice call for a certain period of time (step S202). If there is no necessary processing, a transition is made to the low power consumption mode (step S203).

  After shifting to the low power consumption mode, it is determined whether there is a reception signal for a certain time (step S204), and the cellular phone terminal device 10 and the wireless key device 50 are separated, for example, for a certain time. If the transmission signal cannot be received normally, the connection between the mobile phone terminal 10 and the wireless key device 50 is disconnected (abnormal disconnection) as a connection abnormality or connection failure. At the same time, the lock timer is started (step S205). Here, the lock timer is defined as the time from the occurrence of connection abnormality or connection failure until the terminal function restriction is performed.

  After the connection abnormality or connection failure occurs, the mode shifts to the page / page scan mode (when the terminal is normal) (step S206) and attempts to reconnect to the mobile phone terminal device 10 (paging).

  Then, it is determined whether or not the paging is successful (step S207). If the paging is successful within the lock timer time and the mobile phone terminal device 10 can be reconnected, the lock timer is released (reset) (step S208). Transition to the normal connection mode of S201. If paging fails, it is determined whether the time of the lock timer has elapsed (step S209). If not, the process proceeds to step S207 and paging is continued.

  If the connection cannot be reconnected within the lock timer time after the connection abnormality or connection failure, the transmission amplifier 52a of the wireless key device 50 is set to reduce the transmission power (step S210), and page / page scan (when the terminal is locked) ). For example, the transmission power at this time is a transmission power that cannot be paged unless the distance between the mobile phone terminal device 10 and the wireless key device 50 is within 1 m.

  In a state where the transmission power of the wireless key device 50 is reduced, reconnection with the mobile phone terminal device 10 is attempted, and it is determined whether or not paging is successful (step S211). When the distance between the mobile phone terminal device 10 and the wireless key device 50 is close to the user (in this example, when the distance is within the range of 1 m), the mobile phone terminal device 10 and the wireless key device 50 are reconnected (paging success). ) The wireless key device 50 increases the transmission power again so that the function restriction is applied to the mobile phone terminal device 10 at a distance of 50 m (step S212), shifts to the normal connection mode of step S201, and performs the above-described series of processing. repeat.

  FIG. 25 is a flowchart showing the function restriction control process of the mobile phone terminal device in the state transition shown in FIG. In FIG. 25, the processing from step S221 to S229 corresponds to the processing of steps S2011 to S209 in FIG.

  In FIG. 25, the first state is the normal connection mode (step S221), the authenticity of the connected partner is confirmed, and if there is no problem, processing for shifting to low power consumption communication processing is performed. After a certain period of time, it is determined whether or not there is a necessary process such as a voice call (step S222).

  After shifting to the low power consumption mode, it is determined whether or not there is a received signal for a certain time (step S224), and the cellular phone terminal device 10 and the wireless key device 50 are separated from each other for a certain time. If the transmission signal cannot be normally received, the connection between the mobile phone terminal device 10 and the wireless key device 50 is disconnected (abnormal disconnection) as a connection abnormality or a connection failure. At the same time, the lock timer is started (step S225).

  After a connection abnormality or connection failure occurs, the mode shifts to the page / page scan mode (when the terminal is normal) (step S226), and reconnection with the wireless key device 50 is attempted (paging).

  Then, it is determined whether or not paging is successful (step S227). If paging is successful within the lock timer time and the wireless key device 50 can be reconnected, the lock timer is released (reset) (step S228) and step S221. Transition to normal connection mode. If paging fails, it is determined whether the time of the lock timer has elapsed (step S229). If not, the process proceeds to step S227 and paging is continued.

  Then, after the connection abnormality or the connection failure, if the reconnection is not possible within the lock timer time, the function restriction is applied to the mobile phone terminal device 10 (step S230). At the same time, the transmission power of the wireless key device 50 at this time is reduced to a transmission power that cannot be paged unless the distance between the mobile phone terminal device 10 and the wireless key device 50 is within 1 m, for example (step S210 in FIG. 24).・ Move to scan (terminal lock).

  The cellular phone terminal device 10 tries to reconnect to the wireless key device 50 in a state where the transmission power of the wireless key device 50 is lowered, and determines whether or not paging is successful (step S231). When the distance between the mobile phone terminal device 10 and the wireless key device 50 is close to the user (in this example, when the distance is within the range of 1 m), the mobile phone terminal device 10 and the wireless key device 50 are reconnected (paging success). Then, the function restriction of the mobile phone terminal device 10 is released (step S232). At this time, on the wireless key device 50 side, the transmission power is increased so that the cellular phone terminal device 10 is restricted to function again at a distance of 50 m (step S212 in FIG. 24). Then, the mobile phone terminal device 10 shifts to the normal connection mode in step S201, and repeats the series of processes described above.

  24 and 25 show the function restriction and transmission power control processing in the low power consumption mode, but the same processing is performed when connection abnormality or connection failure is detected even in the normal connection mode.

  In addition, the function restriction cancellation and the transmission power increase processing of the mobile phone terminal device 10 were performed after successful paging, but this does not necessarily need to be performed immediately after successful paging, and when the authentication operation ends or shifts to low power consumption The function restriction of the mobile phone terminal device 10 may be released when the mobile phone terminal device 10 is used.

  FIG. 26 is a sequence diagram showing a function limiting operation of the mobile phone terminal device according to the present embodiment. As described above, as a precondition, the transmission power of the wireless key device 50 is adjusted to a transmission power that disables communication when the mobile phone terminal device 10 and the wireless key device 50 are separated by about 50 m.

  First, in the “normal connection mode” communication, both the mobile phone terminal device 10 and the mobile key device 50 confirm the authenticity of the connected partner, and if there is no problem, perform processing for shifting to low power consumption communication processing. . It is also in this state during voice calls.

  In “low power consumption mode” communication, packets are intermittently transferred to check whether the wireless connection is maintained.

  After that, when the user wearing the wireless key device 50 moves away from the mobile phone terminal device 10 and leaves about 50 m, it becomes difficult to detect the packet transmitted by the counterpart device, and eventually the packet cannot be received. .

  If the packet cannot be normally received for a certain time, both the mobile phone terminal device 10 and the wireless key device 50 disconnect the connection between the mobile phone terminal device 10 and the wireless key device 50 as a connection abnormality or connection failure. (Abnormal disconnection). At the same time, if this connection abnormality or connection failure occurs, both devices start a lock timer.

  Even if a reconnection is attempted after detecting a connection abnormality or a connection failure, if the reconnection is not possible within the lock timer time, the mobile phone terminal device 10 is limited in function. Further, the transmission power of the wireless key device 50 is reduced to a transmission power that can be connected only when the distance between the mobile phone terminal device 10 and the wireless key device 50 is within 1 m, for example. At this time, the user may be notified using the speaker 54a or the light emitting unit 55 of the wireless key device 50 that the transmission power has been reduced or that the mobile phone terminal device 10 of the connection partner is locked. Good.

  Even after the function restriction of the mobile phone terminal device 10 is applied, the mobile phone terminal device 10 and the wireless key device 50 try to reconnect. When the user approaches the mobile phone terminal device 10 again and the mobile phone terminal device 10 and the wireless key device 50 (user) approach within 1 m, reconnection (paging) is successful.

  When the reconnection is successful, the function restriction of the mobile phone terminal device 10 is released. Further, in order to limit the function again at a communication distance of 50 m, the transmission amplifier 52a of the wireless key device 50 is set and the transmission power is raised to the power at which the function is limited at 50 m. By repeating the above sequence, the function restriction of the mobile phone terminal device 10 is executed and released according to the distance between the mobile phone terminal device 10 and the wireless key device 50.

  As described above, this example uses the fact that the communicable distance between devices changes depending on the magnitude of the transmission power of a Bluetooth communication device, and controls the transmission power according to the situation. Specifically, regarding the transmission power when the connection confirmation processing is performed between devices, the transmission power of at least one of the communication devices is set to the transmission power when the function restriction is released rather than the transmission power when the function restriction is applied. I try to make it smaller. Further, after the function restriction is released, the transmission power is raised to the original transmission power when the function restriction is applied again.

  Thereby, the cellular phone terminal device 10 is restricted in function at a location away from the wireless key device 50 by a certain distance, and the function is not restricted in a familiar range (for example, a distance where the user can directly operate the cellular phone terminal device). Furthermore, once the function restriction is applied, the function restriction is not released until the mobile phone terminal device 10 is in a familiar range, and the function restriction is automatically released when the user can operate the distance. It is possible to improve the usability of the function restriction function of the mobile phone terminal 10 and the reliability of security.

  Furthermore, in a wireless communication terminal, particularly a portable wireless communication terminal, it is an important issue to reduce power consumption, and the reconnection transmission power in a state where the function restriction is applied to the mobile phone terminal device 10 of the present example. By reducing the power consumption, the power consumption can be reduced as compared with the conventional case where the transmission power is constant. In addition, when transmission power control is performed by both the mobile phone terminal device 10 and the wireless key device 50, power consumption related to transmission at the time of function restriction is suppressed compared to transmission power control performed by only one side. can do.

  In the above-described embodiment, the mobile phone terminal device 10 incorporates a short-range wireless communication means such as a Bluetooth system, and the short-range wireless communication means is used for operating the security mode. The terminal device 10 may be configured to connect the short-range wireless communication means to the mobile phone terminal device 10 externally without incorporating the short-range wireless communication means. That is, for example, two devices corresponding to the wireless key device are prepared, and one of the two wireless key devices is connected to the mobile phone terminal 10 to communicate with the two wireless key devices. May set the security mode.

  In the embodiment described so far, the Bluetooth communication circuit is built in the mobile phone terminal and wireless communication is performed with the wireless key device using the communication circuit. Wireless communication with the key device may be performed.

  In the case of the Bluetooth system, one of the communication is a master and the other is a slave. However, the above-described wireless key device side is a master and the portable terminal side is a slave, and vice versa. Further, the master and the slave may be exchanged during the communication.

  In the above-described embodiment, the present invention is applied to the security ensuring process of the mobile phone terminal device. However, the security ensuring of other portable terminal apparatuses may be applied by the same process.

  In addition, the wireless key device is also configured as a dedicated key device in the above-described embodiment. However, the wireless key device functions as a key device of the present invention for a terminal device (for example, a PDA device) that can communicate with the Bluetooth method or the like. A program to be installed may be installed to function as a key device.

  In addition, the present invention is not limited to the above-described embodiments, and may be applied to portable communication terminals such as a portable information terminal (PDA) and a portable personal computer, in addition to the cellular phone terminal device. Of course, various other configurations can be adopted without departing from the gist of the present invention.

It is the perspective view which showed the system configuration example by one embodiment of this invention. It is the block diagram which showed the example of a structure of the communication terminal device by one embodiment of this invention. It is the block diagram which showed the structural example of the wireless key apparatus by one embodiment of this invention. It is explanatory drawing which showed the usage example by one embodiment of this invention. It is the block diagram which showed the modification (example integrated with the headset) of the radio | wireless key apparatus by one embodiment of this invention. It is explanatory drawing which showed the usage example of the example of FIG. It is explanatory drawing which showed the example of a setting of the security mode by one embodiment of this invention. It is explanatory drawing which showed the example of a transition of the security mode by the communication mode by one embodiment of this invention. It is the flowchart which showed the example of the mode selection process by one embodiment of this invention. It is the flowchart which showed the example of the scanning process by one embodiment of this invention. It is the flowchart which showed the example of the page transmission process by one embodiment of this invention. FIG. 6 is a timing diagram illustrating an example of processing states of page transmission and scanning according to an embodiment of the present invention. It is the sequence diagram which showed the example of the connection state by one embodiment of this invention. It is the flowchart which showed the example of a low power consumption transfer process by one embodiment of this invention. It is the sequence diagram which showed the example of transmission of the communication status message by one embodiment of this invention. It is the flowchart which showed the example of communication processing with the portable terminal by one embodiment of this invention. It is the flowchart which showed the example of a communication process with the wireless key apparatus by one embodiment of this invention. It is the sequence diagram which showed the example of transmission in the sniff state by one embodiment of this invention. It is the flowchart which showed the example of a process in the standby state by one embodiment of this invention. It is the flowchart which showed the mode selection process example by the terminal side by other embodiment of this invention. It is the flowchart which showed the mode selection processing example by the side of the wireless key apparatus by other embodiment of this invention. It is the flowchart which showed the example of the mode selection state in the case of FIG. 21, FIG. It is a state transition diagram in the terminal function restriction | limiting of the example of one embodiment of this invention. It is a flowchart which shows the function restriction | limiting process in the mobile telephone terminal device of the example of one embodiment of this invention. It is a flowchart which shows the transmission power control process in the wireless key of the example of one embodiment of this invention. It is a sequence diagram of the function restriction | limiting operation | movement of the example of one embodiment of this invention. It is a figure which shows the example of the state transition in the conventional terminal function restriction | limiting.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Cell-phone terminal device, 11 ... Antenna, 12 ... Communication circuit for radio telephones, 13 ... Audio | voice processing part, 14 ... Speaker, 15 ... Microphone, 16 ... Display part, 17 ... Operation part, 18 ... Memory, 19 ... Control , 21 ... vibrating part, 22 ... light emitting part, 23 ... terminal part, 24 ... power supply circuit, 25 ... control line, 26 ... data line, 31 ... antenna, 32 ... short-range wireless communication circuit, 33 ... transmission amplifier, 40 ... Non-contact IC card function unit, 41 ... Billing data control unit, 42 ... Antenna, 50 ... Wireless key device, 51 ... Antenna, 52 ... Short-range wireless communication circuit, 52a ... Transmission amplifier, 53 ... Control unit, 54 ... Vibration 55, light emitting unit, 56 ... terminal unit, 57 ... power supply circuit, 58 ... control line, 59 ... operation unit, 60 ... headset with wireless key, 61 ... antenna, 62 ... short-range wireless communication circuit, 62 ... Transmission amplifier, 63 ... Control part, 64 ... Operation part, 65 ... Memory, 66 ... Audio processing part, 67 ... Speaker, 68 ... Microphone, 69 ... Vibration part, 70 ... Light emitting part, 71 ... Terminal part, 72 ... Power supply Circuit 73 ... Control line 74 ... Data line

Claims (6)

In a communication system including a communication terminal device and a wireless key device capable of wireless communication with the communication terminal device and a predetermined wireless communication method,
The communication terminal device
A communication unit for transmitting and receiving wireless signals in the predetermined wireless communication method;
A state determination unit that determines a wireless state of the wireless signal received by the communication unit;
A control unit that restricts a predetermined function according to the wireless state determined by the state determination unit;
The wireless key device is:
A communication unit for transmitting and receiving wireless signals in the predetermined wireless communication method;
A state determination unit that determines a wireless state of the wireless signal received by the communication unit;
A transmission power changing unit for changing the transmission power of a radio signal transmitted by the communication unit;
The control unit of the communication terminal apparatus, when the state determination unit determines that the wireless state of a wireless signal transmitted with the first transmission power from the wireless key device is worse than a predetermined communication state, Restricting the functions of
After limiting the predetermined function, the wireless state of the wireless signal transmitted from the wireless key device with the second transmission power smaller than the first transmission power is better than the predetermined communication state by the state determination unit When the determination is made, the restriction of the restricted predetermined function is released. Furthermore, the communication terminal device includes a transmission power changing unit that controls transmission power of a radio signal transmitted by the communication unit,
When a predetermined function is restricted by the control unit, the transmission power changing unit is configured to reduce a second communicable distance between the communication terminal device and the wireless key device to be shorter than when the first transmission power is used. Change to transmit power,
In addition, when the restriction of a predetermined function is restricted by the control unit, the transmission power changing unit determines from the second transmission power that the communication possible distance between the communication terminal device and the wireless key device is increased. Change to first transmission power
The communication system according to claim 1. A communication unit that transmits and receives wireless signals to and from a connection partner device using a predetermined wireless communication method;
A state determination unit that determines a wireless state of the wireless signal received by the communication unit;
When the wireless state of the wireless signal transmitted with the first transmission power from the connection partner device is determined to be worse than the predetermined communication state by the state determination unit, the predetermined function is limited and the predetermined After the function is limited, the state determination unit determines that the wireless state of the wireless signal transmitted from the connection partner apparatus with the second transmission power smaller than the first transmission power is better than the predetermined communication state. And a control unit that releases the restriction of the restricted predetermined function. Furthermore, a transmission power changing unit that controls transmission power of a radio signal transmitted by the communication unit is provided,
When the predetermined function is limited, the transmission power changing unit changes the second transmission power to be shorter than the first transmission power when the communicable distance with the connection partner device is,
Further, when the restriction on the predetermined function is restricted, the transmission power changing unit changes the second transmission power to the first transmission power so that a communicable distance with the connection partner terminal device is increased. Do
The communication terminal device according to claim 3. A communication unit that transmits and receives wireless signals to and from a connection partner device using a predetermined wireless communication method;
A state determination unit that determines a wireless state of the wireless signal received by the communication unit;
A notification unit for notifying that a predetermined function of the connection partner device is limited ;
Radio conditions of the radio signals transmitted from the previous SL connection partner apparatus by a first transmission power, when it is determined that worse than a predetermined communication state by the state determination section, controls the notification unit to perform the notification In addition, after the notification, the wireless state of the wireless signal transmitted from the connection partner apparatus with the second transmission power smaller than the first transmission power is better than the predetermined communication state by the state determination unit. A wireless key device comprising: a control unit that controls the notification unit to stop the notification when the determination is made. Furthermore, a transmission power changing unit that controls transmission power of a radio signal transmitted by the communication unit is provided,
When the notification is executed, the transmission power changing unit changes the second transmission power to be shorter than the first transmission power when the communicable distance to the connection partner apparatus is shorter than the first transmission power.
Further, when the notification is stopped, the transmission power changing unit changes the second transmission power to the first transmission power so that a communicable distance with the connection partner terminal apparatus is increased.
The wireless key device according to claim 5.

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