JP4889526B2 - Mobile terminal device and key - Google Patents

Description

  The present invention relates to a portable terminal device that performs wireless communication with a plurality of keys and performs wireless authentication with each key, and a key that performs wireless communication with the portable terminal device.

A mobile terminal device typified by a mobile phone and a key (a key is a wireless communication circuit having at least an antenna and an IC chip, and information stored in the IC chip is transmitted and received between the mobile terminal device and the antenna via the antenna. An anti-theft system is proposed that prevents the object to which the key is attached from being stolen by using a wireless authentication technique (for example, Patent Document 1) performed between the key and the object.
Patent No. 293276

  Patent Document 1 discloses wireless authentication technology performed between one mobile terminal device and one key, but in the future, the number of keys that one mobile terminal device performs wireless authentication is It is expected to increase. In that case, one mobile terminal device uses, for example, frequency division multiplexing (FDM) or time division multiplexing (TDM) to wirelessly communicate with each of a plurality of keys. It is assumed that authentication is performed. However, no matter which method is used, there is a limit to the number of keys that can be wirelessly authenticated by one portable terminal device at the same time.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a portable terminal device and a key that can perform wireless authentication with any number of keys. .

Further, the mobile terminal device of the present invention sets one of a wireless unit that performs wireless communication with a key and a plurality of time slots that form one frame in association with the key. A time slot setting unit, a frame setting unit that sets a frame that permits wireless communication with the key among a plurality of frames, and a plurality of time slots that constitute the frame set by the frame setting unit. the out at the time slot which is set by the time slot setting section, and a wireless control unit for controlling the radio section so as to perform wireless communication with reference to the pairing signal between said key, e Bei, the The pairing signal includes an identification ID registered in advance with the mobile terminal device and the key, and the time slot setting unit receives the pairing signal from the key. It is set as a time slot assigning a time slot containing the time set in the key.

  With this configuration, wireless communication with a key can be performed in a time slot of a frame in which wireless communication with a key is disabled by setting whether wireless communication with a key in frame units is enabled or disabled. As a result, one time slot can be shared.

  In the mobile terminal device of the present invention, the time slot setting unit sets any one of a plurality of time slots constituting one frame in association with a plurality of keys, and the frame setting unit Includes setting a different frame for each of the plurality of keys as a frame permitting wireless communication with the key.

  With this configuration, even if the number of keys for wireless communication is larger than the number of time slots, one time slot can be shared among a plurality of keys. As a result, the mobile terminal device can perform wireless authentication with these keys regardless of the number of keys for wireless communication.

  Moreover, the portable terminal device of the present invention includes a configuration in which the frame setting unit sets a frame that permits wireless communication with the key among a plurality of frames at a predetermined number of frames. .

  With this configuration, each of the plurality of keys to which a common time slot is assigned performs wireless communication repeatedly at intervals of a predetermined number of frames, so that the frequency of wireless communication can be made equal.

  Further, in the mobile terminal device of the present invention, when the time slot setting unit has a number of the plurality of keys larger than the number of the plurality of time slots, the time slot setting unit includes a plurality of time slots constituting one frame. Any one of the above is set in association with at least two of the plurality of keys.

  With this configuration, when the number of keys for wireless communication is less than or equal to the number of time slots, one time slot is exclusively assigned to one key, while the number of keys for wireless communication is less than the number of time slots. In many cases, by assigning one time slot to a plurality of keys together, it is possible to optimize time slot assignment according to the number of keys.

  Further, in the mobile terminal device of the present invention, when the time slot setting unit has a number of the plurality of keys larger than the number of the plurality of time slots, the time slot setting unit includes a plurality of time slots constituting one frame. Any one of the plurality of keys is set in association with at least two of the plurality of keys specified based on the priority order assigned to each of the plurality of keys.

  With this configuration, depending on the priority of the key, you can choose whether to assign one time slot exclusively to that key or with another key, depending on the importance of the object to which the key is attached. The wireless communication frequency can be set.

  In the mobile terminal device of the present invention, the wireless unit may perform information between a time slot set in association with the key by the time slot setting unit and the key set by the frame setting unit. And information on frames for which wireless communication is permitted.

  The key of the present invention includes a wireless unit that performs wireless communication with the mobile terminal device of the present invention, and a plurality of time slots that constitute a frame specified by information about the frame received by the wireless unit. A radio control unit that controls the radio unit to perform radio communication with the mobile terminal device in a time slot specified by information on the time slot received by the radio unit. .

  With this configuration, even if the number of keys for wireless communication is larger than the number of time slots, one time slot can be shared among a plurality of keys. As a result, the mobile terminal device can perform wireless authentication with these keys regardless of the number of keys for wireless communication.

  According to the portable terminal device and key of the present invention, wireless authentication can be performed with any number of keys.

  First, a flow of processing when one mobile terminal device performs wireless authentication with each of a plurality of keys using time division multiplexing (TDM) will be described. FIG. 5 shows a wireless communication sequence by the antitheft system to which the time division multiplexing method is applied. FIG. 5 shows a sequence in the case where one mobile terminal apparatus T performs wireless authentication with three keys. The mobile terminal device T divides the data transmission period at regular intervals (the divided period is referred to as a frame), and further assigns time slots obtained by dividing the frame at certain time intervals to the keys K1, K2, and K3. In each time slot, various signals necessary for wireless authentication with a specific key are transmitted and received. In FIG. 5, the mobile terminal device T has a key K1 in time slot 1 (SL1), a key K2 in time slot 2 (SL2), and a key K3 in time slot 3 (SL3). Transmission / reception is performed, and wireless authentication is performed with a period (communication period) corresponding to the length of the frame with each of the keys K1, K2, and K3.

  As a result of periodic wireless authentication between one mobile terminal device T and each of the keys K1, K2, and K3 in this way, the mobile terminal device T or the key K1, At least one of K2 and K3 emits a notification sound, and theft prevention is realized. That is, as shown in the schematic diagram of the anti-theft system to which the time division multiplexing system is applied as shown in FIG. 6, keys are attached to the PC 611, the camera 612, and the sunglasses 613, and the authentication area (FIG. 6 (a), 6 Any one of the PC 611, the camera 612, and the sunglasses 613 that was in the circle centered on the mobile terminal device 61 shown in (b) (see FIGS. 6A and 6B). When the object is carried to the outside of the circle centered on the portable terminal device 61), the object carried to the portable terminal device 61 or the non-authentication area emits a notification sound.

  In the future, the number of keys used for wireless authentication by one mobile terminal device is expected to increase more and more. One method for dealing with the increase in the number of keys is to shorten the time interval of one time slot and increase the number of time slots constituting one frame. However, in order to reliably transmit and receive various signals necessary for performing wireless authentication, one time slot must have a certain time interval or more, and therefore, a time slot that constitutes one frame. The number of can't be increased indefinitely. For this reason, in the anti-theft system to which the time division multiplexing method is applied, the number of keys that can be wirelessly authenticated by one mobile terminal device is limited. The portable terminal device of the present invention is intended to perform wireless authentication with any number of keys.

  Hereinafter, a mobile terminal device according to an embodiment of the present invention will be described in detail. Processing by the mobile terminal device according to the embodiment of the present invention can be mainly divided into two phases. The first phase is a wireless authentication process when the number of keys is smaller than the number of time slots, and the second phase is a wireless authentication process when the number of keys is larger than the number of time slots. is there. Hereinafter, the period during which the first phase process is performed is referred to as a “slot monopoly period”, and the period during which the second phase process is performed is referred to as a “slot sharing period”.

[Slot monopoly period]
First, the processing in the case where the mobile terminal device according to the embodiment of the present invention that has not performed wireless authentication with any key starts wireless authentication with one key is shown in FIG. 1 according to the embodiment of the present invention. A description will be given with reference to the sequence in the slot monopoly period by the mobile terminal device. When starting the wireless authentication with the key K1, the mobile terminal device T needs to set a time slot to be assigned to the key K1, and notify the key K1 of the set time slot. For this purpose, the mobile terminal device T first activates the radio circuit provided in the mobile terminal device T, and conforms to the communication protocol used in the radio authentication technology in all the time slots (SL1 to SL4) constituting the frame. Waiting for various signals to be transmitted from the key K1 (this waiting process is, for example, for a certain period from when an instruction to execute this process is received by an operation key provided in the mobile terminal apparatus T, or the mobile terminal apparatus This is performed for a certain period after the power is turned on at T. Also, a period during which the portable terminal device T performs this waiting process is referred to as a waiting period.) On the other hand, when the power is turned on, the key K1 starts transmission of a pairing signal, and a period until the ACK signal notifying that the reception of the pairing signal is successful is received from the mobile terminal device T (FIG. 1). In the pairing signal transmission period), the transmission of the pairing signal is continued. The pairing signal is a signal including an identification ID registered in advance in both the mobile terminal device T and the key K1, and the mobile terminal device T or the key K1 refers to the pairing signal, It is possible to determine whether or not the transmission partner device that has transmitted the ring signal is registered as a pair with the own device.

  When the mobile terminal device T receives a pairing signal from the key K1 at an arbitrary point in the standby period (SL1 to SL4), the mobile terminal device T refers to the identification ID included in the pairing signal and registers the identification ID registered in advance. It is determined whether or not it matches. If the identification IDs match, the mobile terminal device T sets any one of the time slots (SL1 to SL4) to the key K1, and notifies the key K1 of the set time slot. In FIG. 1A, the mobile terminal device T sets the time slot SL1 to the key K1.

  Specific examples of the process for setting one time slot to the key K1 and the process for notifying the set time slot to the key K1 include the following. That is, the mobile terminal device T sets a time slot including a time point when the pairing signal is successfully received from the key K1 as a time slot to be assigned to the key K1, and notifies that the pairing signal has been successfully received. Send a signal to key K1. On the other hand, the key K1 recognizes that the time slot starting from the time when the ACK signal is received from the mobile terminal device T is assigned to the own device (key K1). When transmitting the ACK signal to the key K1, the mobile terminal device T transmits information related to the time interval of one time slot and information related to the time interval of one frame, and the key that has received these information. K1 recognizes the time interval of one time slot and the time interval of one frame. Thereafter, the portable terminal device T and the key K1 perform transmission and reception of various signals necessary for performing wireless authentication in the time slot SL1.

  Various signals transmitted and received between the mobile terminal device T and the key K1 in order to perform wireless authentication in the time slot SL1 will be described. The mobile terminal device T transmits in the time slot SL1 a search signal including an authentication code (hereinafter referred to as an identification ID) assigned in advance when paired with the key K1. The key K1 is waiting to receive the search signal transmitted from the portable terminal device T in the time slot SL1 assigned to the key K1.

  When the key K1 is located in a non-authentication area where the mobile terminal device T cannot communicate, the key K1 cannot receive the search signal transmitted from the mobile terminal device T and maintains the search mode. Thereafter, when the key K1 moves from the non-authentication area to the authentication area, the key K1 receives the search signal, and is paired in advance with the identification ID included in the search signal received from the mobile terminal device T and the key K1 being stored. As soon as it is determined that the identification IDs match, the mobile terminal device T is notified that the identification IDs match (that is, there is a paired key within a certain distance), and the authentication mode is set. Will be migrated.

  When the mobile terminal device T is notified from the key K1 that the identification IDs match, the mobile terminal device T performs authentication with the key K1 using the challenge and response method in the subsequent time slot SL1. Specifically, when the mobile terminal device T receives a signal notifying that the identification IDs match from the key K1, the mobile terminal device T transmits a challenge request to the key K1, and the key K1 receiving the challenge request generates a random number. The portable terminal device T that has transmitted the challenge signal generated to the portable terminal device T and that has received the challenge signal transmits a response signal generated by performing encryption processing on the challenge signal to the key K1, and the response signal When the decrypted response signal matches the challenge signal, the key K1 determines that the authentication has succeeded. When the decrypted response signal does not match the challenge signal, the key K1 determines that the authentication has failed. The various signals transmitted and received between the mobile terminal device T and the key K1 in the authentication mode include the identification ID of the mobile terminal device T and the identification ID of the key K1 that transmits or receives the signal. Therefore, the mobile terminal device T refers to the identification ID of the key K1 included in the various signals to determine which key K1 transmitted the various signals, and the key K1 is also transmitted from the mobile terminal device T. With reference to the identification ID of the key K1 included in the transmitted various signals, it is determined whether or not the various signals are transmitted to the own device. When the authentication is successful, the portable terminal device T performs the above-described authentication mode again in the time slot SL1 of the next frame. On the other hand, if the authentication fails, the mobile terminal device T performs the processing in the time slot SL1 of the next frame. Transition to the search mode starts transmission of the identification ID. Even if the transmission / reception of the signal is interrupted during authentication using the challenge and response method between the mobile terminal device T and the key K1, the mobile terminal device T shifts to the search mode and transmits the identification ID. Will start.

  Next, processing when the portable terminal device according to the embodiment of the present invention performing wireless authentication with the key K1 starts wireless authentication with another key K2 will be described with reference to the sequence of FIG. In order to suppress power consumption, the portable terminal device T that performs wireless authentication with the key K1 often suppresses power supply to the wireless circuit in time slots (SL2 to SL4) in which wireless communication is not performed. However, when the mobile terminal device T receives an instruction to execute the standby process using the operation key provided in the mobile terminal device T, the mobile terminal device T also activates the radio circuit in the time slots (SL2 to SL4) and the time slots (SL2 to SL2). In SL4), it waits for various signals in accordance with the communication protocol used in the wireless authentication technology to be transmitted from another key K2. On the other hand, when the power is turned on, the key K2 starts transmitting a pairing signal, and transmits the pairing signal until it receives from the portable terminal device T an ACK signal notifying that the pairing signal has been successfully received. Continue.

  Since the mobile terminal device T has already set a time slot in the key K1 during the time slot SL1 during the period in which the key K is transmitting the pairing signal to the mobile terminal device T, the pairing signal An ACK signal notifying that the reception is successful is not transmitted to the key K2. Therefore, the mobile terminal device T does not set the time slot SL1 to the key K2. On the other hand, when the mobile terminal device T receives a pairing signal from the key K2 at an arbitrary point in the standby period (SL2 to SL4), the mobile terminal device T refers to the identification ID included in the pairing signal and registers it in advance. It is determined whether or not it matches the identification ID. If the identification IDs match, the mobile terminal device T sets any one of the time slots (SL2 to SL4) to the key K2, and notifies the key K1 of the set time slot. In FIG. 1A, the mobile terminal device T sets the time slot SL2 to the key K2. Thereafter, the portable terminal device T and the key K2 perform transmission / reception of various signals necessary for performing wireless authentication in the time slot SL2. Note that the various signals transmitted and received by the mobile terminal device T and the key K2 for performing wireless authentication in the time slot SL2 are the same as the various signals transmitted and received by the mobile terminal device T and the key K1.

  Thereafter, when the portable terminal device according to the embodiment of the present invention performing wireless authentication with the key K1 and the key K2 starts wireless authentication with another key K3, or when the key K1, the key K2, and the key K3 are When the mobile terminal device according to the embodiment of the present invention performing wireless authentication starts wireless authentication with another key K4, the standby period by the mobile terminal device T is the time slot (SL3 to SL4). ) And time slots SL3 and SL4. In FIG. 1B, the mobile terminal device T sets the time slot SL3 as the key K3 and the time slot SL4 as the key K4.

[Slot sharing period]
Next, FIG. 2 shows processing when the mobile terminal device according to the embodiment of the present invention performing wireless authentication with the same number of keys as the number of time slots starts wireless authentication with another key. The sequence in the slot sharing period by the mobile terminal device according to the embodiment of the present invention will be described with reference to FIG. Since the mobile terminal device T performing wireless authentication with the same number of keys as the number of time slots already sets all the time slots and a plurality of keys one-on-one, In response to the pairing signal transmitted from the key K5 for starting the wireless authentication, an ACK signal notifying that the reception is successful is not transmitted to the key K5. For this reason, in order to successfully receive the pairing signal from the key K5, the mobile terminal device T first wirelessly communicates with any of the plurality of keys K1, K2, K3, and K4 performing wireless authentication. It is necessary to temporarily suspend authentication and secure one of the time slots.

  When the mobile terminal device T receives an instruction to execute standby processing using the operation key provided in the mobile terminal device T, the mobile terminal device T interrupts the wireless authentication with the key K3 and performs wireless authentication with the time slot SL3 set for the key K3. It waits for various signals according to the communication protocol used in the technology to be transmitted from another key K2. Here, the fact that the mobile terminal device T interrupts the wireless authentication with the key means that the mobile terminal device T does not transmit various signals necessary for performing the wireless authentication. In wireless authentication between a mobile terminal device and a key, whether the mobile terminal device and the key are in a search mode or an authentication mode, the mobile terminal device receives a predetermined signal (a search signal and authentication in the search mode). In the mode, transmitting the challenge request) is the first communication step. By not transmitting the predetermined signal, the mobile terminal device T interrupts the wireless authentication with the key K3. On the other hand, the key K3 waits for a predetermined signal to be transmitted in the time slot SL3 although various signals necessary for performing wireless authentication are not transmitted from the portable terminal device T.

  On the other hand, when the power is turned on, the key K5 starts transmitting a pairing signal and receives a ACK signal for notifying that the pairing signal has been successfully received from the portable terminal device T (FIG. 2). During the pairing signal transmission period), the transmission of the pairing signal is continued. The mobile terminal device T has been described as interrupting wireless authentication with the key K3. However, it is also conceivable to select a key for interrupting wireless authentication with the mobile terminal device T based on some condition. A method of selecting a key for interrupting wireless authentication will be described later (see FIG. 4).

  When the portable terminal device T receives a pairing signal from the key K5 at any point in the standby period (SL3), the portable terminal device T refers to the identification ID included in the pairing signal and matches the identification ID registered in advance. It is determined whether or not to do. If the identification IDs match, the mobile terminal device T executes the following process. That is, the mobile terminal device T sets a time slot including a time point when the pairing signal is successfully received from the key K5 as a time slot to be assigned to the key K5, and notifies that the pairing signal has been successfully received. A signal is transmitted to the key K5. On the other hand, the key K5 recognizes that a time slot starting from the time when the ACK signal is received from the mobile terminal device T is assigned to the own device (key K5). When transmitting the ACK signal to the key K5, the portable terminal device T also transmits information on the time interval of one time slot, information on the time interval of one frame, and information on a frame permitting wireless communication. To do. The mobile terminal device T permits wireless communication as a frame-related information that allows wireless communication using a frame that is spaced n frames (n = 1, 2, 3,...) From the previous wireless authentication frame. , Etc. are transmitted to the key 5 (in FIG. 2, the mobile terminal device T wirelessly transmits a frame that is 1 frame apart from the frame for which the previous wireless authentication was performed as information on the frame for which wireless communication is permitted. Suppose you are sending information to allow communication). The signal transmitted from the mobile terminal device T and the key K5 in the time slot SL3 is received by the key K3 waiting for a predetermined signal to be transmitted in the time slot SL3. However, since various signals transmitted and received between the mobile terminal device T and the key K1 include an identification ID for designating the reception destination of the signal, the key K3 is the destination of the reception included in the various signals. With reference to the identification ID, it is determined whether or not the signal is transmitted to the own device (key K3) and does not respond to the signal transmitted to the other device (key K5).

  The key K5 that receives these information in a certain frame (frame 3) and recognizes the time interval of one time slot and the time interval of one frame is the time slot SL3 of the next frame (frame 4). Transmits and receives various signals necessary for wireless authentication. After that, the key K5 performs transmission / reception of various signals necessary for performing wireless authentication in a frame (frame 6) specified from information on a frame permitting wireless communication.

  In addition, the mobile terminal device T performs wireless authentication with the suspended key K3 in the time slot SL3 of the frame (frame 5) next to the frame (frame 4) subjected to wireless authentication with the key K5. Resume. Here, restarting the wireless authentication with the key by the mobile terminal device T means that various signals necessary for performing the wireless authentication are transmitted to the mobile terminal device T. The mobile terminal device T sends a predetermined signal (search signal in the search mode, challenge request in the authentication mode) according to the mode (search mode or authentication mode) when the wireless authentication was performed with the key K3 last time. Send to key K3. Furthermore, when transmitting the predetermined signal to the key K3, the portable bag terminal device T also transmits to the key K3 the same information as the information transmitted to the key K5 regarding the frame that permits wireless communication.

  The key K3, which has received the predetermined signal and the information related to the frame permitting wireless communication in a certain frame (frame 5), performs the wireless authentication in the frame (frame 7) specified from the information related to the frame permitted to perform wireless communication. Transmits and receives various signals necessary to implement Thereafter, the mobile terminal device T performs wireless authentication alternately between the key K3 and the key K5.

  As described above, the mobile terminal device according to the embodiment of the present invention can perform wireless authentication by assigning a common time slot to two keys in [slot sharing period] and switching those keys in units of frames. Even if the number of keys to be subjected to wireless authentication is greater than or equal to the number of time slots constituting one frame, wireless authentication with all these keys is possible.

  In the [slot sharing period] described above, the processing when one mobile terminal device performs wireless authentication with five keys in the time division multiplexing method in which the number of time slots is limited to four has been described. The same processing can be performed even if the number of keys increases to 6, 7,. That is, by assigning another key to the time slots SL1, SL2 and SL4 to which one key has already been assigned in FIG. 2 by the same processing described in [Slot sharing period], It can handle even when the number increases. In addition, the number “n” in the information regarding the frame that permits wireless communication, that is, the information that wireless communication is permitted in a frame that is n frames apart from the frame that was previously subjected to wireless authentication is expressed as “(one If the number of keys to be assigned to the time slot is −1 ”, it is possible to assign a common time slot to a plurality of keys and switch the keys in units of frames to perform wireless authentication.

  In the [slot sharing period] described above, after all the time slots and a plurality of keys are set one-to-one in the [slot exclusive period], any one of the time slots is reset to a plurality of keys. However, it is not always necessary to set all the time slots and a plurality of keys one-to-one. That is, when a mobile terminal device that performs wireless authentication with a certain key starts wireless authentication with another key when there is a vacancy in the time slot, it is assigned to the key that has been wirelessly authenticated so far. A certain time slot may be assigned to another key for starting wireless authentication.

  Next, the configuration of the mobile terminal device of the present invention that performs the processing in the [slot sharing period] will be described. FIG. 3 shows a functional block diagram of the portable terminal device and the key according to the embodiment of the present invention. The mobile terminal device T according to the embodiment of the present invention includes a wireless authentication unit 11, a mobile communication wireless control unit 12, an output unit 13, operation keys 14, and a mobile terminal control unit 15. The key K according to the embodiment of the present invention includes a wireless authentication unit 24 and an alarm sound output unit 25.

  In the wireless authentication unit 11 of the portable terminal device T, the authentication wireless unit 111 is a short-range communication radio wave or UWB (Ultra Wide Band) used for RFID (Radio Frequency Identification) via an antenna. The transmission / reception of the carrier wave including the identification code signal of the key K set as a pair with the portable terminal device T by pairing processing is controlled based on a predetermined communication protocol. The authentication wireless unit 111 includes circuits such as an amplifier circuit, a modulation circuit, a demodulation circuit, an encoding circuit, and a decoding circuit.

  The slot assignment storage unit 112 stores a correspondence table in which the identification ID of a key that has successfully received a pairing signal and the number of a time slot assigned to the key are associated with each other. As shown in FIG. 2, when the time slots are assigned to the keys K1, K2, K3, K4, and K5, the identification ID of each key and the number of the time slot are associated with each other, and in particular, the key K3 and the key K5. A common time slot number “3” is assigned to the identification ID.

  When the authentication control unit 113 is notified from the mobile terminal control unit 15 that the operation key 14 has received an instruction to execute the standby process, the authentication control unit 113 refers to the slot allocation storage unit 112 and assigns a time slot to which no identification ID is allocated. Is assigned to the identification ID included in the pairing signal received from the key by the authentication wireless unit 111 and the number of the time slot including the time when the pairing signal was successfully received. Store in the storage unit 112 ([slot monopoly period]). On the other hand, the authentication control unit 113 refers to the slot assignment storage unit 112, and if the identification ID is assigned to all the time slot numbers, the authentication wireless unit 111 performs wireless authentication with any one of a plurality of keys. And the identification ID included in the pairing signal received from another key in the time slot set to the interrupted key, and the time slot number including the time when the pairing signal was successfully received Are stored in the slot allocation storage unit 112 ([slot sharing period]).

  Further, when the authentication control unit 113 causes the authentication wireless unit 111 to interrupt the wireless authentication with any of the plurality of keys, the authentication control unit 113 refers to the priority stored in the slot allocation storage unit 112 and interrupts the wireless authentication. Select the key to be activated. FIG. 4 shows an example of a correspondence table stored in the mobile terminal device according to the embodiment of the present invention. In FIG. 4, time slot numbers are associated with identification IDs, and priorities of “high”, “medium”, and “low” are set in correspondence. Here, it is assumed that the key of the identification ID set with the priority “high” always monopolizes one time slot, and the key of the identification ID set with the priority “medium” is empty in the time slot. If there is a time slot, one time slot is monopolized, and if there is no available time slot, it is arbitrarily selected from the identification ID set with the priority "Middle" or the identification ID set with the priority "Low" The key of the identification ID set with the priority “low” is always the identification ID set with the priority “medium” or the identification ID set with the priority “low”. Each of them is defined as sharing a time slot with one arbitrarily selected from among them. This priority is preferably set as appropriate according to the importance of the object to which the key is attached. For example, the user of the mobile terminal device T can set the priority through a user interface displayed on the LCD 133. The set priority is stored in the slot assignment storage unit 112 as a correspondence table in association with the identification ID associated with the mobile terminal device user by an operation from the operation key 14. In accordance with the definition of the priority associated with the identification ID, in FIG. 4, the time slots with the numbers “1” and “4” are exclusively used for the keys identified by the identification IDs “001” and “009”, respectively. The keys identified by the identification IDs “002” and “016” share the time slot of the number “2”, and the keys identified by the identification IDs “004” and “012” have the number “3”. ”Is shared.

  Thus, according to the index such as the priority that can identify whether the communication cycle of a key with a certain identification ID can be changed or not, when the mobile terminal device is set to perform wireless communication with the key If there is no vacancy in the time slot, the communication cycle of the key having an index indicating that the communication cycle can be changed can be changed, and a new key can be set in the time slot generated by the change. Can be shared efficiently. Furthermore, since it is possible to increase the number of keys that can be registered while maintaining a communication cycle according to the importance of an object to be wirelessly authenticated, it is excellent as a wireless communication device that performs wireless authentication.

  The authentication control unit 113 refers to the correspondence table stored in the slot allocation storage unit 112, and causes the authentication wireless unit to perform wireless authentication using a frame formed of time slots based on the correspondence table. Specifically, the authentication control unit 113 receives the reception intensity of radio waves used in wireless communication (for example, the voltage and S / N ratio of radio waves input to the demodulation circuit, the error rate of data decoded by the decoding circuit, etc. Is calculated), and it is determined whether the reception intensity is greater than or less than a preset threshold value (a numerical value for distinguishing the authentication area and the non-authentication area). If the measured reception strength is equal to or greater than the threshold, the authentication control unit 113 subsequently acquires the identification ID of the key K included in the decoded data in advance by a pairing process performed with the key K. If it matches, the use restriction release signal notifying that the authentication with the key K is successful is output to the portable terminal control unit 115, and if it does not match, the authentication with the key K is failed. The use restriction request signal to be notified is output to the mobile terminal control unit 115. On the other hand, if the measured reception intensity is less than the threshold value, the authentication control unit 113 outputs a use restriction request signal notifying that the authentication with the key K has failed to the mobile terminal control unit 115.

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

  In addition, in the wireless authentication unit 24 of the key K, the authentication wireless unit 241 includes a radio wave for short-range communication and UWB (Ultra Wide Band) used for RFID (Radio Frequency Identification) via an antenna. The transmission / reception of the carrier wave including the identification code of the portable terminal device T set as a pair with the key K by pairing processing is controlled based on a predetermined communication protocol. The authentication wireless unit 241 includes circuits such as an amplifier circuit, a modulation circuit, a demodulation circuit, an encoding circuit, and a decoding circuit. The authentication control unit 243 is calculated based on the reception intensity of radio waves used in wireless communication (for example, the voltage and S / N ratio of radio waves input to the demodulation circuit, the error rate of data decoded by the decoding circuit, etc.). And the reception strength is determined to be greater than or less than a preset threshold value (numerical value for distinguishing the authentication area and the non-authentication area). If the measured reception intensity is greater than or equal to the threshold value, the authentication control unit 243 subsequently performs an identification ID of the mobile terminal device T included in the decoded data in advance by a pairing process performed with the mobile terminal device T. Compared with the acquired identification ID, if it matches, an alarm release signal notifying that the authentication with the mobile terminal device T is successful is output to the alarm sound output unit 25. An alarm request signal notifying that the authentication has failed is output to the alarm sound output unit 25. On the other hand, if the measured reception intensity is less than the threshold, the authentication control unit 243 outputs an alarm request signal notifying that the authentication with the mobile terminal device T has failed to the alarm sound output unit 25.

  The alarm sound output unit 25 is configured by a speaker and starts outputting an alarm sound when an alarm request signal is input from the authentication control unit 243.

  As described above, according to the mobile terminal device and the key according to the embodiment of the present invention, it is possible to perform wireless authentication with any number of keys. This is useful in the field of authentication technology in which wireless communication is performed between each key and wireless authentication is performed with each key.

Sequence in slot monopoly period by portable terminal device of embodiment of this invention Sequence in slot sharing period by portable terminal device of embodiment of present invention Functional block diagram of portable terminal device and key according to an embodiment of the present invention An example of a correspondence table stored in the mobile terminal device according to the embodiment of the present invention Wireless communication sequence by anti-theft system using time division multiplexing Overview diagram of anti-theft system using time division multiplexing

Explanation of symbols

K1 to K5 Keys SL1 to SL4 Time slot T Mobile terminal device 11 Wireless authentication unit 111 Authentication wireless unit 112 Slot assignment storage unit 113 Authentication control unit 12 Mobile communication wireless control unit 13 Output unit 131 Speaker 132 Microphone 133 LCD
14 Operation Key 15 Mobile Terminal Control Unit 24 Wireless Authentication Unit 241 Authentication Wireless Unit 243 Authentication Control Unit 61 Mobile Terminal Device 611, 612, 613 Key

Claims (7)

A wireless unit that performs wireless communication with the key;
A time slot setting unit for setting any one of a plurality of time slots constituting one frame in association with the key;
Of a plurality of frames, a frame setting unit that sets a frame that permits wireless communication with the key; and
The wireless communication is performed with reference to the pairing signal with the key in the time slot set by the time slot setting unit among the plurality of time slots constituting the frame set by the frame setting unit. A wireless control unit for controlling the wireless unit;
Bei to give a,
The pairing signal includes an identification ID registered in advance with a mobile terminal device and a key,
The time slot setting unit sets a time slot including a time point set to receive the pairing signal from the key as a time slot to be assigned to the key;
Mobile terminal device. The mobile terminal device according to claim 1,
The time slot setting unit sets any one of a plurality of time slots constituting one frame in association with a plurality of keys,
The frame setting unit sets a different frame for each of the plurality of keys as a frame that permits wireless communication with the key;
Mobile terminal device. The mobile terminal device according to claim 1 or 2,
The frame setting unit sets a frame that permits wireless communication with the key among a plurality of frames at a predetermined frame number interval.
Mobile terminal device. The mobile terminal device according to claim 2 or 3,
When the number of the plurality of keys is larger than the number of the plurality of time slots, the time slot setting unit selects any one of a plurality of time slots constituting one frame as the plurality of timeslots. Set in association with at least two of the keys,
Mobile terminal device. The mobile terminal device according to claim 4,
When the number of the plurality of keys is larger than the number of the plurality of time slots, the time slot setting unit selects any one of a plurality of time slots constituting one frame as the plurality of timeslots. Of the keys, set in association with at least two specified based on the priority assigned to each of the plurality of keys,
Mobile terminal device. A portable terminal device according to any one of claims 1 to 5,
The wireless unit is information related to a time slot set in association with the key by the time slot setting unit, information related to a frame that is set by the frame setting unit and that allows wireless communication with the key, and Send,
Mobile terminal device. A wireless unit that performs wireless communication with the mobile terminal device according to claim 6;
In the time slot specified by the information regarding the time slot received by the radio unit among the plurality of time slots constituting the frame specified by the information regarding the frame received by the radio unit, the portable terminal device A wireless control unit that controls the wireless unit to perform wireless communication with
Key with.

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